Improving the stability of a HPHT Hydraulic Cubic Press is crucial for ensuring the efficient and reliable operation of the equipment, especially since the HPHT Hydraulic Cubic Press is a high-tech device for synthesizing artificial diamond, requiring high precision and operational sensitivity. Below is a detailed explanation of how to improve the stability of a HPHT Hydraulic Cubic Press:1、Improvement of the Valve Plate Return Oil System Problem Description: When the press is in operation, the system is under high pressure (13-15 Mpa, which can reach 87-89 Mpa after boosting) and high temperature. After synthesis, during depressurization, the 10-liter variable plunger pump needs to be frequently started to achieve depressurization. Due to the high pressure and frequent starting, the press becomes unstable, noisy, and various oil pipes vibrate violently, especially the booster return oil pipe, which frequently breaks, leading to oil spray accidents. Furthermore, the loud noise makes it difficult to hear hammer cracking sounds, shortens the service life of the plunger pump, increases maintenance time and production costs, and raises power consumption. Improvement Measures: A powerless unloading electromagnetic ball valve was added to the valve plate return oil system. This type of ball valve has good sealing performance, is not affected by hydraulic locking, is less affected by hydraulic forces, requires small thrust for commutation and reset, and is suitable for high pressure. The electromagnetic ball valve is installed at the hydraulic control one-way valve in the valve plate return oil circuit. Through electrical control, the plunger pump is shut off during charging, overpressure, and fast return, and the high-pressure automatic depressurization is controlled by the electromagnetic ball valve. When the pressure is relieved to 3-4 Mpa, the plunger pump automatically starts until depressurization is completed. Improvement Effects: Equipment stability has improved. Oil pipe vibration is reduced, return oil pipe joints no longer break, reducing accidents and increasing uptime. Noise is significantly reduced. This provides favorable conditions for accurately judging abnormal sounds and reduces human-caused hammer breakage and explosion accidents. The service life of the plunger pump is extended. It can now be used for one year instead of six months, saving costs. The number of plunger pump starts is reduced, and power consumption is lowered, saving costs.2、 Transformation of the Pump Group Problem Description: The 50-liter vane pump used by the equipment has a large flow rate (50 liters at 1000 rpm, actual up to 73.5 liters/minute), which is a significant difference from the 10-liter axial plunger pump (10 liters at 1000 rpm, actual maximum 14.4 liters/minute). This mismatch leads to frequent equipment failures, higher oil temperature, and easy wear of the axial plunger pump, often resulting in insufficient or slow pressure compensation. This causes the vane pump to intervene too quickly for pressure compensation, leading to equipment instability. The 50-liter vane pump has a large flow rate, but the valve plate return oil port is small (inner diameter about φ17mm). This results in poor oil return, excessively fast oil flow, which causes the hydraulic oil to heat up easily. High oil temperature can lead to internal and external leaks, frequent pressure compensation, and fast wear of valves, thus causing equipment instability. The large flow rate of the 50-liter vane pump creates a significant impact on the electromagnetic relief valve (valve core bore φ10mm). The valve core has high usage frequency and wears out quickly, leading to frequent damage, repair, and replacement of the relief valve, resulting in more downtime. This is also a factor contributing to equipment instability and high noise. Improvement Measures: The 50-liter vane pump was replaced with a 32-liter adjustable axial plunger pump. This pump controls plunger operation via a swash plate, resulting in lower noise than quantitative vane pumps, easier maintenance and parts replacement. Its flow can be adjusted according to actual use, reducing impact on the relief valve and extending its service life. The 10-liter axial plunger pump was replaced with a 16-liter variable axial plunger pump. This change resolved the issues of insufficient or slow pressure compensation, improving equipment stability, shortening plunger pump start-up time, and reducing noise. An additional return oil pipe with an inner diameter of φ14mm was added to the valve plate return oil circuit. Improvement Effects: The oil temperature significantly decreased, and the return pressure can be better controlled at 3-4 Mpa, which plays a crucial role in improving equipment stability.3、Optimization of Hydraulic Oil Management Importance: Hydraulic oil is a key component for improving equipment stability. Improvement Measures: The 46# oil used at the initial stage of factory construction was replaced with 68# anti-wear hydraulic oil. Hydraulic oil is filtered every 4 months to address oil contamination issues. The hydraulic system employs methods such as suction oil filtration, high-pressure oil filtration, and return oil filtration to ensure the cleanliness of the hydraulic oil. An oil cooler is used for forced cooling of the hydraulic oil in the oil tank to reduce oil temperature. Improvement Effects: These measures provide assurance for the reliable operation of the hydraulic system and contribute significantly to ensuring equipment stability.4、Modification of the Electrical Control System Improvement Measures: Several programs were added to enhance safety and stability: "No block loaded" protection to prevent hammer extrusion. Slow rise of hammer head voltage protection to reduce hammer burning. "Previous block curve" display added to the screen, facilitating comparison with the previous block by synthesis operators during operation to prevent accidents. Improvement Effects: Through these improvements, the equipment's stability has significantly increased, and noise has been reduced. This provides a quiet and comfortable working environment for synthesis operators, allowing them to accurately identify abnormal sounds and reduce hammer breakage and explosion accidents.5、Improvement of Main Machine Installation and Overhaul Accuracy Importance: The installation and overhaul accuracy of the press's main machine components are another important factor affecting equipment stability. Problem Description: The press main machine consists of 6 sets of hinge beams connected by 12 pins. There are many fit clearances, and improper selection of dimensional tolerances can cause the pressure cylinder to "bow". During high-pressure operation, the hinge beams expand in six directions. If the fit between a pin and its hole is improper in a certain direction, that direction will expand more, causing the force direction to shift, leading to deformation of the synthesized block and easy occurrence of hammer cracking accidents. Improvement Measures: During cylinder removal, key dimensions are measured to select appropriate fit tolerances. Ensure that the fit tolerance between the pin and the pinhole is within the specified range. Grinding of damaged pinholes must be carefully managed; large-area grinding must be avoided to ensure the surface roughness of the hole. The fit between the piston and the working cylinder, and between the piston and the guide sleeve, must strictly adhere to the required tolerances. Dimensions of all removed workpieces must be measured, and those out of tolerance should be re-selected or replaced. The outer surface of the workpieces must be polished to prevent damage to sealing components.Through the comprehensive management and improvement of the HPHT Hydraulic Cubic Press as described above, equipment stability has been significantly enhanced, and uptime has increased, ensuring the completion of production tasks. Concurrently, various costs have been reduced, accidents have decreased, and hard hammer consumption and maintenance costs have been greatly lowered.
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The cooling water temperature control system for the HPHT Hydraulic Cubic Press aims to control the outlet temperature of the cooling water precisely, thereby indirectly achieving effective control over the hammer head temperature during the diamond synthesis process, which in turn improves the quality of diamond synthesis and extends the service life of the top hammer.Below is a detailed explanation of the system's principle for controlling cooling water temperature:1、Control Objective and Challenges： The HPHT Hydraulic Cubic Press is a key equipment for producing artificial diamonds, and the hammer head temperature directly affects the quality of diamond synthesis and the lifespan of the top hammer. Since the hammer head temperature is not convenient to measure and control directly, the method of controlling the cooling water outlet temperature flowing through the hammer chamber is generally adopted to indirectly control the hammer head temperature. Traditionally, manual and rough adjustment of the water outflow rate makes it difficult to respond to changes in water and hammer temperature during the synthesis process. This can lead to decreased diamond synthesis quality and even increase the risk of production accidents like "hammer cracking" or "explosion". The cooling water temperature control system addresses the shortcomings of manual adjustment by precisely controlling the cooling water outlet temperature to achieve hammer temperature control during diamond synthesis. The challenges faced by this cooling water temperature control system include its inherent lag, time-varying, and non-linear characteristics.2、System Composition and Basic Principle： The automatic water temperature control system consists of six completely independent and identical subsystems. Each subsystem is responsible for controlling the temperature of one cooling water circuit. Each subsystem primarily comprises a controller, a stepper motor, and a flow control valve. The core of the control process is: the upper computer sets a desired cooling water outlet temperature value. The controller real-time acquires the actual cooling water outlet temperature. By comparing the actual temperature with the set temperature, the controller calculates the temperature deviation and its rate of change. Based on this deviation information, the system utilizes a multi-mode PID algorithm to determine the precise displacement the stepper motor needs to adjust. Upon receiving the displacement command, the stepper motor precisely adjusts the opening of the connected flow control valve. When a high cooling water outlet temperature is detected, the controller instructs the flow control valve to increase its opening, thereby increasing the cooling water flow, taking away more heat, and lowering the outlet temperature. Conversely, when the outlet temperature is too low, the controller instructs the flow control valve to decrease its opening, reducing the cooling water flow, and raising the outlet temperature.3、 Core Hardware Implementation： Temperature Measurement: The system uses a DS18B20 single-wire digital temperature sensor to measure the cooling water outlet temperature. This sensor offers a wide measurement range (-55℃ to +125℃), high resolution (0.0625℃), long transmission distance, and strong anti-interference capability, making it suitable for harsh on-site environments. To further reduce interference, twisted-pair shielded cables are used for the measurement signal lines, and a median-average filtering method is employed in the software, which involves sampling temperature values multiple times, removing the maximum and minimum values, and then calculating the average to improve measurement accuracy. Control Core: The entire water temperature controller uses an STM32 microcontroller as its core processor. Communication Circuit: The controller communicates with the upper computer via an RS485 bus, following the MODBUS protocol in RTU mode, ensuring reliable data transmission between the upper and lower computers through a master-slave response mechanism. To enhance system reliability, the RS485 system is optically isolated from the microcontroller, and protection circuits are added to the communication lines to prevent surge currents from damaging the chips. Each subsystem has an independent communication address. Stepper Motor Drive: The precise adjustment of the flow control valve's opening relies on the accurate movement of the stepper motor. The system incorporates an independent stepper motor drive circuit, with LV8727 as the core drive chip. LV8727 is a PWM current-controlled micro-stepping motor drive chip that supports various micro-stepping options, fast decay, slow decay, and mixed decay modes, and includes built-in temperature and overcurrent protection. The controller generates PWM waves with specific duty cycles, which are then filtered to produce a control voltage (Vref). This control voltage precisely determines the stepper motor's drive current, ensuring that its driving torque meets the requirements for the flow adjustment valve in its opening, closing, and regulating states.4、Key Control Algorithms： Stepper Motor Acceleration/Deceleration Algorithm: To ensure the stepper motor's speed, precision, and stability, and to prevent lost steps and overshoot, the system employs a uniform acceleration/deceleration algorithm. This algorithm divides the stepper motor's displacement adjustment process into three phases: uniform acceleration, uniform velocity, and uniform deceleration. The program calculates the number of steps for uniform acceleration, uniform velocity, and uniform deceleration based on given parameters such as initial speed, initial acceleration, target speed, and deceleration. By discretizing the acceleration and deceleration processes and calculating the pulse time for each step, the system achieves ideal control of the stepper motor, allowing the flow adjustment valve to quickly and smoothly reach the calculated opening position. Cooling Water Temperature Control Algorithm (Multi-Mode PID): Addressing the inherent characteristics of large lag, time-varying, and non-linearity in the water temperature control system, the system utilizes a multi-mode PID control combined with conventional incremental PID single-mode control. Control Mode Switching: When the temperature deviation is less than a preset value, the system uses a conventional incremental PID algorithm, which achieves good control performance. Large Deviation Handling: When the temperature deviation is large, the system automatically switches to multi-mode PID control. Mode Division: Multi-mode PID categorizes the control process into three modes—acceleration control, deceleration control, and steady-state control—by evaluating characteristic variables such as temperature deviation (e), its first derivative (ė), and second derivative (ë). PID Parameters in Different Modes: During the acceleration control phase (energy storage process), primarily proportional action is used for fast response (Ki=0, Kd=0). In the deceleration control phase, integral and differential actions are mainly employed to suppress overshoot (Kp=0). In the steady-state control phase, primarily integral control is used to eliminate steady-state error (Kp=0, Kd=0). By applying different combinations of PID parameters in different control modes, the multi-mode PID algorithm effectively suppresses overshoot in systems with large lag and achieves steady-state with the shortest possible regulation time, enabling the system to adjust to the target temperature smoothly, quickly, and accurately.5、System Performance: Experimental results show that the system can control the outlet temperature of each cooling water circuit to within ±2℃ of the set value from the upper computer. The system's maximum overshoot is only 2.5%. The system can complete an adjustment from one temperature state to another within 18 seconds. This fully meets the stringent requirements of the diamond synthesis process for outlet water temperature, enabling intelligent control of diamond cooling water, significantly reducing the possibility of production accidents, decreasing the labor intensity for operators, and greatly improving the quality of diamond production.
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To enhance the control precision of a HPHT Hydraulic Cubic Press during the synchronous filling process, improvements can be made in several areas, including measurement technology, feedback control, intelligent algorithms, and automation control.Here are the detailed improvement methods and ideas:Detailed Improvement Methods and IdeasHigh-Precision Detection of Six-Cylinder DisplacementAlthough displacement sensors have been used on six-sided anvil presses for nearly a decade, their primary application has been for rapid traverse control and non-critical system parameter measurement. They haven't been truly integrated into core high-pressure system control due to poor repeatability over large measurement ranges and a lack of application scenarios for small-range, high-precision detection.During the filling process, the piston stroke typically ranges from 3 mm to 5 mm. Within this measurement range, high-precision displacement sensors can effectively provide accurate measurements, offering a reliable basis for achieving displacement synchronization.High-Precision Pressure Sensors and Precise Pressure ControlCurrent filling control methods typically involve setting a fixed pump displacement, which rapidly fills the working cylinders with hydraulic oil. This often leads to uncontrolled pressure increases in the working cylinders during pyrophyllite compression, with actual filling pressures frequently exceeding the set value by more than 20%.During the filling process, synchronization is highly sensitive to pressure changes. Therefore, adopting high-precision pressure sensors with an accuracy of 0.01 MPa in the control system and precisely controlling the filling pressure rise rate are crucial for improving the synchronous filling control level.Proportional Valves Replacing Throttle Valves for Single-Cylinder Flow ControlCurrently, the unconnected filling method uses six manual throttle valves to adjust the flow rate for each cylinder, resulting in poor control precision, low automation, and weak anti-interference capability.By replacing throttle valves with electro-hydraulic proportional valves, online automatic adjustment of flow rates for each working cylinder can be achieved. This not only effectively overcomes problems such as poor precision, repeatability, and stability but also eliminates tedious manual adjustments, ensuring optimal filling synchronization for each synthetic block.Six-Cylinder Displacement Comparison and Correction AlgorithmBased on the technologies of using displacement sensors to collect piston displacement and replacing throttle valves with proportional valves, the displacement sensors can continuously feed piston displacement signals back to the control system during the filling process.The system can compare the displacement of all six working cylinders and promptly adjust any cylinder whose displacement falls outside the acceptable range, correcting its displacement to ensure synchronous movement of all six cylinders. This algorithm can effectively achieve automatic six-cylinder synchronous control.Hybrid Control Method Combining Pressure and DisplacementThe ultimate goal of synchronous filling control is to achieve synchronous movement of the top anvils. In practice, displacement changes are achieved by adjusting single-cylinder flow rates, and the fundamental reason for flow changes lies in pressure variations. Therefore, the synchronous filling process control of a six-sided anvil press is a comprehensive process that simultaneously controls pressure, flow, and displacement.Previous control methods often focused on only a single variable, such as pressure or flow, leading to suboptimal control results. The correct approach is to leverage the computational capabilities of the electronic control system to dynamically distribute the flow rate to each working cylinder while ensuring a stable increase in filling pressure, thereby achieving precise synchronous control of all six-cylinder displacements and effectively improving filling synchronization.The technical value of improving filling synchronous control precision is reflected in the following aspects:Improved High-Pressure Seal Stability: Enhanced synchronous filling control technology can effectively improve the uniformity of pyrophyllite compression during the filling stage, leading to a more symmetrical seal edge formation. This significantly improves the high-pressure sealing performance of the synthetic blocks, reduces the likelihood of "explosions," enhances safety, and lowers production costs.Improved Uniformity of Pressure Gradient Field: Improved synchronous filling control technology helps stabilize the internal pressure gradient field of the synthetic blocks. This is particularly beneficial for producing large-sized products with large synthetic blocks, as it can maximize the utilization rate of the high-pressure cavity volume and increase product output.Improved Repeatability of Side-Heated Carbon Tube Resistance: Poor filling synchronization can lead to random degrees of cracking or breakage of heating carbon tubes during the filling process. These damages create contact resistance, resulting in non-uniform temperature field distribution, which in turn affects the quality stability of high-end products (such as high-grade composite sheets). By improving synchronous filling control technology, the random damage to heating carbon tubes can be minimized, effectively improving the repeatability of resistance distribution and thus enhancing the quality of high-end products, providing technical assurance for domestic product manufacturers.
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The application and development of HPHT Hydraulic Cubic Press in China have a history of over 40 years. For a long time, single-acting intensifiers or ultra-high pressure pumps have been adopted as the intensification devices. Domestic single-acting intensifier technology is very mature and widely used by most press manufacturers. However, due to their disadvantages such as large volume, high cost, and stroke limitations, they are increasingly unable to meet the requirements of large-scale development and long-process pressure holding for HPHT Hydraulic Cubic Press. Although ultra-high pressure pumps offer the advantage of long-term intensification and pressure holding, their short service life, frequent replacement, and high installed power in practical industrial applications have limited their widespread promotion. In recent years, the developed double-acting reciprocating intensifier, capable of automatic continuous intensification, possesses unparalleled advantages over single-acting intensifiers and ultra-high pressure pumps, and has been widely promoted and applied domestically.1. Working Principle of Double-acting Reciprocating IntensifierA single-acting intensifier, driven by low-pressure oil, can only intensify during a single stroke, with the return stroke being a non-working state. The intensification time is limited by the stroke, thus preventing long-duration intensification. In contrast, a double-acting reciprocating intensifier, driven by low-pressure oil, can intensify during both strokes. As long as there is low-pressure oil driving it, it can intensify continuously. Figure 1illustrates the schematic diagram of a double-acting reciprocating intensifier. It is mainly composed of an intensifier cylinder, an automatic reversing valve, and four ultra-high pressure check valves.The automatic reversing valve (a two-position four-way valve) controls the reciprocating motion of the intensifier cylinder. When the lower position of the automatic reversing valve is connected to the system, oil from the oil source enters the large chamber on the upper side of the intensifier cylinder via port P, and flows into the small chamber on the upper side of the intensifier cylinder via check valve I, generating a downward thrust. The effective action area is the cross-sectional area of the large chamber on the upper side of the intensifier cylinder. This force drives the piston downward.The automatic reversing valve is hydraulically driven to reverse. It utilizes the unequal effective areas of the control chamber's small piston and large piston, with the oil source pressure biasing the small piston, and the large piston controlling the pressure to be either zero or the oil source pressure. This mechanism controls the reciprocating motion of the automatic reversing valve spool, changing the working position of the automatic reversing valve. As shown in Figure 1, a control oil groove is opened in the middle of the intensifier cylinder piston. When the piston moves down to the lowest end, the oil source pressure communicates with the large piston of the automatic reversing valve through the control oil groove. Although the acting pressures on the large and small pistons are equal at this time, the acting area of the large piston is greater than that of the small piston, causing the automatic reversing valve to switch to the upper position, and the intensifier cylinder begins to move upward for intensification. When the piston moves up to the highest end, the large piston of the automatic reversing valve communicates with port T through the control oil groove. At this point, the force exerted by the small piston is greater than that by the large piston, causing the automatic reversing valve to switch to the lower end, and the intensifier cylinder begins to move downward for intensification... From this, it can be seen that as long as pressurized oil is continuously supplied, the intensifier will automatically reciprocate and continuously output the intensified liquid.Currently, double-acting reciprocating intensifiers have been successfully applied in Φ650mm cylinder diameter presses and Φ750mm cylinder diameter presses. The maximum working pressure can reach 120 MPa, and the pressure control accuracy can reach ±0.01 MPa. The intensification ratio is 7:1. The overpressure speed of the intensifier can be controlled by regulating the flow or pressure entering the intensifier.This hydraulic circuit uses two variable pumps as power sources. The oil circuit controlling the forward and reverse movements of the six cylinders is the same as the original oil circuit. The oil circuit controlling the intensifier consists of a proportional relief valve, an electro-hydraulic directional valve, and a safety valve. The two variable pumps are combined as a large displacement variable pump and a small displacement variable pump. During overpressure, the large pump is activated (or both pumps are activated simultaneously). The electro-hydraulic directional valve is energized, and the output flow to the double-acting reciprocating intensifier is adjusted by closed-loop control of the large pump motor speed via a frequency converter. This in turn controls the overpressure speed. Alternatively, the overpressure speed can be controlled by closed-loop control through a proportional relief valve. When overpressure is complete, the electro-hydraulic directional valve is de-energized, and the double-acting reciprocating intensifier stops working. During pressure compensation, the small pump is activated, the electro-hydraulic directional valve is energized, and pressure compensation accuracy is controlled by the proportional relief valve. When pressure compensation is complete, the electro-hydraulic directional valve is de-energized, and the intensifier stops working. A safety valve is set in the circuit to ensure that the intensifier does not exceed the equipment's safe pressure in case of electrical component failure. Pressure relief can be achieved directly from high pressure using the same relief valve as an ultra-high pressure pump.Advantages of Double-acting Reciprocating Intensifier in Cubic Press Applications As a new intensification device, the double-acting reciprocating intensifier offers unparalleled advantages over single-acting intensifiers and ultra-high pressure pumps in cubic press applications. These advantages are specifically reflected in the following aspects:(1) Small size, light weight, low cost. The currently applied double-acting reciprocating intensifier weighs only 85kg and has dimensions of 775×150×205 (mm). Compared to single-acting intensifiers and ultra-high pressure pumps, its manufacturing cost is lower.(2) Unrestricted overpressure time. As long as the low-pressure oil source is continuous, the double-acting reciprocating intensifier can continuously intensify, meeting the requirements for long-duration overpressure.(3) Simple hydraulic circuit and control. Driven by low-pressure oil, it provides automatic continuous intensification. Control over the double-acting reciprocating intensifier's start, stop, and intensification speed can be achieved by controlling low-pressure hydraulic components, without the need for other auxiliary electronic components and ultra-high pressure hydraulic components.(4) Low noise. The movement of the double-acting reciprocating intensifier is plunger-type sliding, with no rigid mechanical connections. This results in lower noise compared to ultra-high pressure pumps.(5) Low installed power. Only two variable piston pumps are required to complete the overpressure and pressure compensation control for the double-acting reciprocating intensifier.
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The Hpht Cubic Press is the key equipment for synthesizing artificial diamonds. It can transformer carbon into diamond crystal under high temperature and high pressure conditions. The HPHT hydraulic cubic press can apply pressure uniformly to the sample under high pressure, thus ensuring the stability of the synthesis process. The precise design of the anvils allows even distribution of pressure and control within the required range.Controlling critical parameters such as temperature, pressure, and holding time is the key to ensuring stable diamondsynthesis.Temperature control: Multiple temperature sensors are set to monitor the temperatures at different positions of the sample and close-loop control is utilized to compare with the preset temperature curve, enabling uniform temperature rise of the sample during heating with the control error within +1°cPressure control: The anvils are equipped with strain gauges to monitor real-time pressure changes. The control systemcompares the measured pressure with the preset curve and precisely controls the oil pressure to keep the pressure control errorwithin +0.5GPa.Holding time control： A timer is set so that once the preset temperature and pressure are reached, the system activates the timer to precisely control the holding time with the error within +10 seconds.Automated control: All parameters vary following the preset curves, with the system automaticaly completing each stage of heating, holding, decompressing, etc.， without manual intervention.Data recording: Critical parameters are recorded real-time throughout the process and compared to the preset curves，generating control reports. Alarms are triggered if deviations exceed limits.Feedback and optimization: Based on results from multiple syntheses， parameter control can be further optimized byimproving the preset curves to enhance process stability.Through intelligent closed-loop control and fine monitoring of multiple parameters, the anvil apparatus enables high-precision control of critical parameters to make the entire synthesis process stable and controllable.The quality of the synthesis cube is also an important step to ensure synthesis stability. The stability of the synthesis cube has a significant impact on the quality of artificial diamond, mainly in the following aspects：1. Influences pressure uniformity: If the synthesis capsule is not stable enough， it can easily collapse or fracture under highpressure, resulting in uneven pressure distribution within the capsule and affecting the uniform synthesis of diamonds.2. Influences temperature distribution: Poor thermal conductivity of the synthesis capsule can lead to temperature gradientsinside, with insufficient synthetic conditions in some areas for forming complete diamond crystals.3. Causes changes to the synthesis environment: Collapse of the synthesis capsule alters the relative positions between the sample and pressure medium, changing the pressure distribution between them, which is detrimental to stable synthesis.4. Results in compressive deformation: Insufficient hardness of the synthesis capsule makes it prone to inelastic deformationunder high pressure， failing to provide adequate supporting force and leading to compressive deformation of the sample.5.Reduces synthesis efficiency: The instability of the synthesis capsule requires frequent replacement, not only wastingmaterials but also reducing the overall efficiency of synthesis.6. Affects yield and quality: Poor stability of the synthesis capsule can lead to decreased yields and inconsistent quality.By optimizing the design of the Hpht Cubic Press and carefully controlling the synthesis parameters, the process of artificialdiamond synthesis can be made stable and controllable, improving the quality of synthetic diamonds. Overall, the precise design of the Hpht Cubic press and the use of intelligent control systems are key to ensuring a stable synthesis process.
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1、Myth: Lab-Grown Diamonds Are FakeFact: Lab-grown diamonds are far from imitation gems. They are created using advanced technological processes that replicate natural diamond-growing conditions but in a controlled environment. These stones have the same chemical composition and crystal structure as natural diamonds. Think of it like comparing backyard-grown apples to those from a well-regulated orchard—the only difference is the origin, but the quality remains genuine.Chemical Composition: Lab-grown diamonds share the same chemical composition, crystal structure, optical properties, and physical properties as mined diamonds. Both are made of carbon and crystallize in the isometric system.Creation Process: Lab-grown diamonds are crafted using methods like High Pressure High Temperature (HPHT) and Chemical Vapor Deposition (CVD), which replicate natural diamond growth over a shorter period.Recognition by Gemological Institutes: Reputable institutes, such as the Gemological Institute of America (GIA). 2、Myth: Lab-Grown Diamonds Lack Brilliance and FireFact: Lab-grown diamonds are meticulously crafted, resulting in gems with excellent light performance and extraordinary fire. Their brilliance rivals that of natural diamonds.Precision Crafting: Lab-grown diamonds are carefully cut and polished to maximize brilliance and fire, ensuring they sparkle just as beautifully as their mined counterparts.3、Myth: Lab-Grown Diamonds Have No Resale ValueFact: Lab-grown diamonds do have resale value. While the market for them is still evolving, reputable jewelers and buyers recognize their worth. As awareness grows, so does their resale potential.4、Myth: Lab-Grown Diamonds Are UncomfortableFact: Lab-grown diamonds are more budget-friendly than mined diamonds. Their streamlined production processes and reduced environmental impact contribute to lower prices. Consumers can enjoy high-quality diamonds without breaking the bank.5、Myth: Lab-Grown Diamonds Are Not Sustainable or EthicalFact: Lab-grown diamonds are indeed sustainable and ethical. Their production consumes fewer resources and has a smaller environmental footprint compared to mining. Plus, they are conflict-free, aligning with global sustainability efforts.6、Myth: Lab-Grown Diamonds Lack RarityFact: While lab-grown diamonds are more accessible, they can still be rare. Unique colors, large sizes, and specific characteristics make them valuable and sought after.7、Myth: Lab-Grown Diamonds Are Inferior in QualityFact: Lab-grown diamonds match the quality of mined diamonds. They possess the same physical, chemical, and optical properties. Reputable gemological institutes grade them using the same criteria as mined diamonds.
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The popularity of lab-created diamonds is on the rise, with production reaching 6 million carats in 2020. Projections indicate that this figure will surge to 19.2 million carats by 2030. However, it remains significantly lower than the annual production of 140–150 million carats of natural mined diamonds.Lab-grown diamonds, with equivalent quality and weight, are now notably more affordable than natural diamonds. Discounts range from 40% off in retail stores to a substantial 75% off wholesale prices. This affordability allows consumers to acquire larger diamonds for their budget. As production methods continue to evolve, it’s likely that the price difference will widen further. Lab-grown diamonds, celebrated for their radiant beauty and cost-effectiveness, shine brightly in the jewelry market, promising a dazzling future.Lab-created diamonds, also known as synthetic or cultured diamonds, are man-made gems with identical physical and chemical properties to natural diamonds. These lab-created diamonds are cultivated in a controlled laboratory environment using advanced technology that replicates the natural diamond formation process deep within the Earth's mantle. One significant advantage of lab-grown diamonds is their conflict-free nature. Unlike natural diamonds, which can be linked to mining practices, lab-grown diamonds have minimal environmental impact as they do not require mining or excavation. Moreover, lab-created diamonds are typically more affordable than natural ones because they can be produced on demand without the uncertainty of mining conditions. Additionally, they offer consistency in quality and size, making them an appealing choice for consumers seeking reliable and ethically sourced diamond options.Lab-grown diamonds provide an affordable way to realize diamond dreams. These diamonds offer the desired size and quality for engagement rings and other jewelry without straining your budget. Remarkably, lab-grown diamonds are physically, chemically, and optically identical to natural diamonds. Additionally, their production contributes to sustainability efforts, making them a win-win choice for environmentally conscious consumers.Environmental and social impact considerations are increasingly relevant in the jewelry industry, especially concerning diamond mining. Lab-grown diamonds address these concerns by being responsibly produced in laboratories, providing a more environmentally friendly alternative to mined diamonds. As consumers become more conscious of their purchasing decisions, the eco-friendly advantages of lab-grown diamonds are gaining prominence.As natural diamonds become scarcer, lab-created diamonds are positioned to bridge the gap in the market. Esteemed fashion critics and designers foresee a future where lab-grown diamonds take center stage as the primary source of these precious gemstones. By ensuring a sustainable diamond supply, lab-grown options ensure that future generations can appreciate the beauty and significance of these timeless pieces.Beyond their financial and environmental advantages, the true value of lab-grown diamonds lies in their emotional significance. Whether it's an engagement ring, wedding band, or other exquisite jewelry, lab-grown diamonds hold a lifetime of memories and stories, transforming them into cherished keepsakes for generations.Lab-grown diamonds are poised to play a significant role in the future of fine jewelry. Their affordability and ethical, sustainable production methods position them for dominance in the diamond market. As the quality of lab-created diamonds steadily improves, even established jewelry retailers like New World Diamonds are embracing the best lab-grown diamond collections for both men and women. Driven by growing consumer demand for ethical and sustainable options, especially among millennial's, lab-grown diamonds are gaining popularity. With this upward trajectory, lab-grown diamonds are set to shape the future of the fine jewelry industry.
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