Dual-media cold isostatic press

Abstract

The utility model relates to cold isostatic press technical field provides a double medium cold isostatic press, including support, pressure frame and high pressure container, the outside of support is provided with pressure frame, and the upper and lower end of pressure frame inside all are provided with pressure plate, the front end of pressure frame is provided with walking oil jar, and walking oil jar is used for pushing pressure frame to move, the rear end of pressure frame is provided with high pressure container, and high pressure container installs in the rear end of support top, and high pressure container is used for the pressing of product, the utility model discloses through setting up oil -water separation device contains bucket mouth, isolation sleeve, bucket bottom and support bucket, and separates the pressure medium and working medium, and isolation sleeve adopts oil -resistant nitrile rubber, and bucket mouth is the structure of external hanging, effectively prevents oil -water mixing pollution. This design avoids the equipment corrosion caused by medium cross -contamination, reduces the sealing failure problem caused by medium impurity, reduces the equipment maintenance frequency and cost, guarantees the stability of medium performance in the pressing process simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of cold isostatic press technology, and in particular to a dual-medium cold isostatic press. Background Technology

[0002] A dual-medium cold isostatic press is a type of cold isostatic press. It's an ultra-high-pressure hydraulic powder forming device that adds an isolation device to the working cylinder of a cold isostatic press to separate the working medium from the pressurizing medium. An isolation chamber is added to the working cylinder of the dual-medium cold isostatic press. The chamber contains the working medium, such as water, while the outside contains the pressurizing medium, such as oil. The high-pressure medium outside the chamber compresses the working medium inside the isolation chamber, transmitting the pressure to the encapsulating mold, thus applying uniform pressing force to the powder material.

[0003] Existing dual-medium cold isostatic presses have the following problems:

[0004] First, the lack of an effective oil-water separation device makes it impossible to completely separate the pressurizing medium from the working medium, easily leading to oil-water mixing and contamination. This not only causes equipment corrosion but may also lead to seal failure due to impurity of the medium, increasing equipment maintenance frequency and costs. Furthermore, it makes it difficult to guarantee the stability of the medium's performance during the pressing process.

[0005] Secondly, the upper and lower plugs of existing presses may not employ a floating structure, or their sealing structure may not be a combined sealing structure. This makes the seals prone to localized wear under high pressure, resulting in low sealing reliability and a higher risk of leakage. Furthermore, existing presses may not have automated container closing and opening operations, requiring significant manual intervention. This not only reduces the smoothness of equipment operation but may also affect production efficiency and product quality. Utility Model Content

[0006] The purpose of this invention is to provide a dual-medium cold isostatic press, which solves the above-mentioned problems when used in operation.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a dual-medium cold isostatic press, including a support, a pressure-bearing frame and a high-pressure vessel, wherein a pressure-bearing frame is provided on the outside of the support, and pressure-bearing plates are provided at the upper and lower ends inside the pressure-bearing frame.

[0008] The front end of the pressure-bearing frame is equipped with a traveling hydraulic cylinder, which is used to push the pressure-bearing frame.

[0009] A high-pressure vessel is provided at the rear end of the pressure frame, and the high-pressure vessel is installed at the rear end of the top of the support. The high-pressure vessel is used for pressing the product.

[0010] An oil tank is located at the rear end of the support, an oil pump assembly is located at the top of the oil tank, hydraulic components are located on the oil tank, a control pump assembly is located on one side of the rear end of the oil tank, and a cooling and filtration system is located on one side of the control pump assembly.

[0011] Preferably, the bottom of the traveling cylinder is provided with a hinge seat one, the traveling cylinder is hinged to the hinge seat one, the output end of the traveling cylinder is hinged to a hinge seat two, the end of the hinge seat two is fixed with a push plate, and the push plate is fixedly connected to the pressure-bearing frame.

[0012] Preferably, connecting blocks are fixed on both sides of the pressure-bearing frame, and sliding blocks are fixed at the front and rear ends of the connecting blocks. Guide rails are provided at the bottom of the sliding blocks, and the guide rails are located on both sides of the support. The sliding blocks are slidably mounted on the guide rails.

[0013] Preferably, the high-pressure container is equipped with an oil-water isolation device inside, an upper plug is provided on the top of the high-pressure container, a lifting mechanism is provided on one side of the high-pressure container, the output end of the top of the lifting mechanism is connected to the upper plug, and a lower plug is provided at the bottom of the high-pressure container.

[0014] Preferably, the oil-water separation device includes a barrel opening, a separation sleeve, a barrel bottom, and a support barrel, with an exhaust device installed on the upper plug.

[0015] Preferably, the hydraulic components include a booster, a control valve assembly, a drive pump assembly, a control pump assembly, a second cooling and filtration system, and a pre-pressurization pump. The booster is located on one side of the oil pump assembly, the control valve assembly is located on one side of the rear end of the booster, a reversing cartridge valve assembly is located on the top of the control valve assembly, the drive pump assembly is located at the rear end of the oil tank, the second cooling and filtration system is located on one side of the oil tank, and the pre-pressurization pump is located on one side of the second cooling and filtration system.

[0016] Preferably, a pressure relief valve assembly is provided at the rear end of the oil pump unit. The pressure relief valve assembly includes a high-pressure valve assembly, a high-pressure proportional pressure relief assembly, a safety pressure relief valve, and pipelines.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. The present invention relates to a dual-medium cold isostatic press and pressing method, which separates the pressurizing medium from the working medium by setting up an oil-water isolation device including a barrel opening, an isolation sleeve, a barrel bottom, and a support barrel. The isolation sleeve is made of oil-resistant nitrile rubber, and the barrel opening has an external hanging structure, effectively preventing oil-water mixing and contamination. This design avoids equipment corrosion caused by cross-contamination of the media, reduces sealing failure problems caused by impurities in the media, lowers equipment maintenance frequency and costs, and ensures the stability of the media performance during the pressing process.

[0019] 2. The dual-medium cold isostatic press and pressing method described in this utility model uses a high-pressure vessel cylinder made of 25Cr2Ni4MoV alloy forgings, heat-treated and wound with 65Mn steel wire on the outer layer. This results in an effective volume of Ø420×2000mm for the pressing cylinder and an effective volume of Ø350×1920mm for the oil-water isolation device. This structure significantly improves the pressure resistance of the vessel, enabling it to withstand a maximum working pressure of 400MPa. It not only meets the requirements for high-pressure pressing but also expands the size range of processable products. Furthermore, the optimization of materials and winding processes ensures the safe operation of the equipment under high-pressure environments.

[0020] 3. The dual-medium cold isostatic press and pressing method described in this utility model employ a prestressed steel wire winding composite structure for the pressure-bearing frame, achieving a load-bearing capacity of 5542t. Combined with the sliding design of the connecting blocks on both sides, sliding blocks, and guide rails, precise movement is achieved through the pushing action of the traveling hydraulic cylinder. It also includes control points for movement into / out of position and for exceeding limits. This structure ensures stable axial force bearing of the frame while achieving automated movement of the pressure-bearing frame, simplifying the workpiece loading and unloading process, improving operational efficiency, avoiding collision risks during movement, and enhancing the stability of equipment operation.

[0021] 4. The dual-medium cold isostatic press and pressing method described in this utility model employ a floating structure for the upper and lower plugs, with the lower plug featuring a rectangular spring return design. Furthermore, the high-pressure seals of both utilize a combined sealing structure. The floating design adapts to pressure changes within the container, reducing localized wear on the seals. The combined sealing structure enhances sealing reliability under high-pressure conditions and reduces the risk of leakage. The lower plug spring return mechanism, in conjunction with the upper plug lifting mechanism (controlled by a non-contact proximity switch), automates the container's closing and opening operations, improving the smoothness of equipment operation.

[0022] 5. The dual-medium cold isostatic press and pressing method described in this utility model employs a staged pressurization process of "pre-pressurization (0-8MPa) + pressure booster (maximum 400MPa)" to improve the pressing quality of the product. During the pressure holding period, the pressure drops to a set lower limit and is automatically replenished, with a pressure drop of ≤5MPa within 300s of holding pressure. Staged pressurization avoids internal defects in the product (such as pores and cracks) caused by sudden pressure increases. The pressure replenishment mechanism ensures that the product is formed under stable pressure, improving the density uniformity and mechanical properties of the product. The pressure booster adopts a reciprocating plunger structure, which automatically overflows and stops the machine when overpressure occurs, further ensuring the safety of the pressurization process.

[0023] 6. The dual-medium cold isostatic press and pressing method described in this utility model depressurizes according to set parameters through a pressure relief valve group (including a high-pressure proportional pressure relief group, a safety pressure relief valve, etc.). The time for depressurization from the working pressure to 1.5MPa can be set within 3 to 60 minutes, supporting segmented pressure relief, and is fully automatically controlled by PLC. Proportional pressure relief avoids product rebound or equipment impact caused by sudden pressure drops, and segmented pressure relief allows for precise control of the pressure relief rhythm according to the characteristics of the product. PLC automatic control reduces human operation errors, improves the stability and safety of the pressure relief process, and simultaneously increases production efficiency.

[0024] 7. The dual-medium cold isostatic press and pressing method described in this utility model, when depressurized to 2-0 MPa, uses a built-in large-diameter oil extraction valve and oil pump to extract residual liquid, delaying until the upper plug opens before stopping, ensuring the isolation sleeve returns to its original state for easy reuse; the cooling and filtration system starts cooling when the oil temperature is ≥45℃ and heating when it is ≤5℃ (stopping at ≤40℃ and ≥15℃ respectively), and circulates and filters the oil through a 10-micron combined filter. Oil extraction and reset ensure rapid equipment recovery, the cooling and heating system maintains the optimal operating temperature of the oil, the filtration function reduces oil impurities, extends the service life of hydraulic components, and ensures long-term stable operation of the equipment.

[0025] 8. The dual-medium cold isostatic press and pressing method described in this utility model utilizes non-contact proximity switches, micro-motion contact switches, and PLC control for the movement of the pressure frame, the lifting and lowering of the upper plug, and the depressurization process, thereby reducing manual intervention. Automated control not only reduces the intensity and cost of manual operation but also avoids errors caused by human factors, making parameters such as pressure and time in the pressing process more accurate, thus improving product consistency and yield. Attached Figure Description

[0026] Figure 1 This is an overall structural diagram of the present invention;

[0027] Figure 2 This is a cross-sectional view of the overall structure of this utility model.

[0028] In the diagram: 1. Support; 2. Pressure-bearing frame; 3. Pressure-bearing plate; 4. Traveling cylinder; 41. Hinge seat one; 42. Hinge seat two; 43. Push plate; 5. Guide rail; 51. Connecting block; 52. Sliding block; 6. High-pressure vessel; 61. Upper plug; 62. Lower plug; 63. Lifting mechanism; 64. Oil-water isolation device; 7. Oil tank; 8. Intensifier; 9. Oil pump assembly; 10. Pressure relief valve assembly; 11. Control valve assembly; 111. Reversing cartridge valve assembly; 12. Drive pump assembly; 13. Control pump assembly; 131. Cooling and filtration system one; 14. Cooling and filtration system two; 15. Pre-pressurization pump. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings.

[0031] Combination Figures 1 to 2 As shown, a dual-medium cold isostatic press of this utility model includes a support 1, a pressure-bearing frame 2 and a high-pressure vessel 6. The support 1 is provided with a pressure-bearing frame 2 on its outside, and pressure-bearing plates 3 are provided at both the upper and lower ends inside the pressure-bearing frame 2.

[0032] The front end of the pressure-bearing frame 2 is equipped with a traveling cylinder 4, which is used to push the pressure-bearing frame 2 to move.

[0033] A high-pressure container 6 is provided at the rear end of the pressure frame 2, and the high-pressure container 6 is installed at the rear end of the top of the support 1. The high-pressure container 6 is used for pressing the product.

[0034] An oil tank 7 is provided at the rear end of the support 1, an oil pump group 9 is provided at the top of the oil tank 7, a hydraulic component is provided on the oil tank 7, a control pump group 13 is provided on one side of the rear end of the oil tank 7, and a cooling filter system 131 is provided on one side of the control pump group 13.

[0035] The bottom of the traveling cylinder 4 is provided with a hinge seat 41, and the traveling cylinder 4 is hinged to the hinge seat 41. The output end of the traveling cylinder 4 is hinged to a hinge seat 42. The end of the hinge seat 42 is fixed with a push plate 43, and the push plate 43 is fixedly connected to the pressure frame 2.

[0036] Connecting blocks 51 are fixed on both sides of the pressure-bearing frame 2. Sliding blocks 52 are fixed at both the front and rear ends of the connecting blocks 51. Guide rails 5 are provided at the bottom of the sliding blocks 52, and the guide rails 5 are provided on both sides of the support 1. The sliding blocks 52 are slidably mounted on the guide rails 5.

[0037] The high-pressure container 6 is equipped with an oil-water isolation device 64 inside, an upper plug 61 is provided on the top of the high-pressure container 6, a lifting mechanism 63 is provided on one side of the high-pressure container 6, the output end of the top of the lifting mechanism 63 is connected to the upper plug 61, and a lower plug 62 is provided at the bottom of the high-pressure container 6.

[0038] The oil-water separation device 64 includes a barrel opening, a separation sleeve, a barrel bottom, and a support barrel, and an exhaust device is provided on the upper plug 61.

[0039] The hydraulic components include a booster 8, a control valve assembly 11, a drive pump assembly 12, a control pump assembly 13, a second cooling and filtration system 14, and a pre-pressurization pump 15. The booster 8 is located on one side of the oil pump assembly 9, and the control valve assembly 11 is located on one side of the rear end of the booster 8. A reversing cartridge valve assembly 111 is located on the top of the control valve assembly 11. The drive pump assembly 12 is located at the rear end of the oil tank 7, and the second cooling and filtration system 14 is located on one side of the oil tank 7. The pre-pressurization pump 15 is located on one side of the second cooling and filtration system 14.

[0040] The rear end of the oil pump group 9 is equipped with a pressure relief valve group 10, which includes a high-pressure valve group, a high-pressure proportional pressure relief group, a safety pressure relief valve, and pipelines.

[0041] A pressing method using a dual-medium cold isostatic press, the pressing method comprising the following steps:

[0042] S1. Medium preparation: An oil-water isolation device 64 is installed in the high-pressure vessel 6 to separate the pressurized medium from the working medium. The oil-water isolation device 64 includes a barrel opening, an isolation sleeve, a barrel bottom, and a support barrel. The isolation sleeve is made of oil-resistant nitrile rubber.

[0043] S2. Workpiece placement: Place the workpiece to be pressed into the isolation sleeve of the oil-water isolation device 64 and place it in the working medium. Start the walking cylinder 4 to push the pressure frame 2 to move it to the outside of the high pressure container 6. The pressure plate 3 covers the upper plug 61 and the lower plug 62 respectively to bear the axial force transmitted by the upper plug 61 and the lower plug 62.

[0044] S3, Container Closure: The upper plug 61 is lowered and closed by the lifting mechanism 63 to close the high-pressure container 6. The lower plug 62 is reset by a rectangular spring structure. Both the upper plug 61 and the lower plug 62 adopt a floating structure.

[0045] S4. Exhaust operation: Start the pre-pressurization pump 15 to fill the high-pressure container 6 with liquid. The residual air in the container is discharged through the exhaust device of the upper plug 61 until a small amount of liquid is discharged from the exhaust port and the exhaust valve core is automatically closed.

[0046] S5, staged pressurization: First, the pressure is increased to a pre-pressurization pressure of 0-8MPa by the pre-pressurization pump 15, and then switched to the booster 8, which increases the pressure to the maximum working pressure of 400MPa. During the pressure holding process, the pressure is automatically replenished when it drops to the set lower limit.

[0047] S6, Proportional pressure relief: Pressure is relieved through the pressure relief valve group 10 according to the set parameters. The time to relieve pressure from the working pressure to 1.5MPa can be set within 3 to 60 minutes. A segmented pressure relief method can be adopted. The pressure relief process is automatically controlled by PLC throughout.

[0048] S7. Oil pumping reset: When the pressure is reduced to 2-0MPa, start the oil pumping pump group 9 to pump the remaining liquid in the ultra-high pressure container until the upper plug 61 is opened and then stop. At the same time, the gas generated by the pressing component is discharged. The upper plug 61 descends to reset and the lower plug 62 rises to reset.

[0049] S8. Workpiece removal: The pressure frame 2 is moved out by the traveling cylinder 4, the upper plug 61 is opened, and the pressed workpiece is removed.

[0050] In step S1, the elongation rate of the isolation sleeve of the oil-water isolation device 64 is ≥300%, the barrel opening adopts an external hanging structure to prevent oil and water mixing, and the cylinder of the high-pressure vessel 6 is made of 25Cr2Ni4MoV alloy forging and tempered, with 65Mn steel wire wound on the outer layer. After winding, the effective volume of the pressing cylinder is Ø420×2000mm, and the effective volume of the oil-water isolation device 64 is Ø350×1920mm.

[0051] In step S2, the pressure-bearing frame 2 adopts a prestressed steel wire winding composite structure, which can bear 5542t. It is pushed by the walking cylinder 4 and moves on the guide rail 5. The moving process is equipped with control points for moving out to the correct position, moving out to the correct position, moving in to the correct position, and moving in to the correct position. It is controlled by a non-contact proximity switch.

[0052] In step S3, the upper plug 61 is raised and lowered into position by a non-contact proximity switch, and the lower plug 62 is raised into position by a micro-motion contact switch. The high-pressure seal of the upper plug 61 and the lower plug 62 adopts a combined sealing structure.

[0053] The pressing method also includes cooling, filtration and heating steps: during the pressing process, the cooling pump is started when the oil temperature of the pressurizer 8 is ≥45℃, and stopped when it is ≥60℃, and cooling is stopped when it is ≤40℃. The heating device is started when the oil temperature is ≤5℃, and heating is stopped when it is ≥15℃. During the cooling process, the oil is circulated and filtered through a 10-micron combined filter.

[0054] In step S5, the booster 8 is a reciprocating plunger structure with a driving pressure of no more than 28MPa. During the boosting process, the boosting speed is adjusted by a manual flow regulating valve. When the pressure is over-pressurized, the oil is automatically overflowed and the machine stops. During the pressure holding stage, the pressure drop in the high-pressure container 6 is no more than 5MPa within the 300s pressure holding time. During the pressure holding stage, the drive pump of the boosting system stops working.

[0055] In step S6, the pressure relief valve group 10 includes a high-pressure proportional pressure relief group, a hydraulic safety valve, a manual shut-off valve, and a burst valve. During pressure relief, the high-pressure proportional pressure reducing valve controls the pressure on the proportional pressure relief valve group to a low pressure value not exceeding 28MPa.

[0056] In step S7, the oil pumping system uses a built-in large-diameter oil pumping valve and a matching oil pump. The oil pumping process is delayed until the upper plug 61 is opened and then stops to ensure that the isolation sleeve is restored to its original state before pressurization.

[0057] Specifically,

[0058] (a) Suppression System

[0059] The pressing system consists of a support 1 for the workpiece to be pressed, a pressure-bearing frame 2, a traveling cylinder 4, a guide rail 5, and a high-pressure container 6.

[0060] The high-pressure container 6 is a working chamber used for pressing products, and mainly consists of a cylinder, an upper plug 61, a lower plug 62, an oil-water isolation device 64, and an exhaust device.

[0061] The cylinder is made of ultra-high pressure cylindrical material prestressed by high-strength steel wire, and withstands the working pressure during product pressing (maximum working pressure 400MPa). Rigorous calculations of material properties and prestress values ​​ensure that the cylinder remains under compressive stress even at maximum working pressure, guaranteeing safety and reliability. The effective volume of the pressing cylinder after winding is Ø420×2000mm.

[0062] The oil-water isolation device 64 installed inside the high-pressure vessel 6 separates the pressurizing medium (hydraulic oil) and the working medium (machine oil), preventing the particles in the working medium from entering the hydraulic system during depressurization, thus avoiding scouring of the hydraulic valves, improving the life of the hydraulic valves, and reducing operating costs.

[0063] The pressed component is placed in the working medium within the isolation sleeve and pressurized. Through the deformation of the isolation sleeve, the pressurizing medium transmits pressure to the working medium and the component. The effective volume of the isolation device is Ø350×1920mm.

[0064] When it is necessary to press products with a size exceeding Ø350mm in a short period of time, the dual-medium device can be easily removed and replaced with a single-oil-medium device, which is safe and reliable.

[0065] The oil-water separation device 64 consists of a barrel opening (using an external structure to effectively prevent oil-water mixing due to wear of the barrel opening sealing ring), a separation sleeve, a barrel bottom, and a support barrel. The separation sleeve material of the oil-water separation device 64 is made of oil-resistant nitrile rubber used in aircraft fuel tanks, with a design life of ≥2 years and an elongation of ≥300%.

[0066] The high-pressure seals of the upper plug 61 and lower plug 62 employ a combined sealing structure. The ultra-high-pressure sealing ring is made of centrifugally cast aluminum bronze with a design life of ≥1 year; the YX-shaped sealing ring is made of rubber with a design life of ≥1 year. Steel pressure plates are used for fixation to facilitate maintenance and replacement.

[0067] The cylinder material is 25Cr2Ni4MoV, a high-quality alloy forging, quenched and tempered. The mechanical properties and flaw detection requirements are as follows: Mechanical properties: σb≥1250MPa; σs≥1100MPa; δ5≥14%; ψ≥45%; Aκ≥38J;

[0068] Ultrasonic flaw detection shall be performed in accordance with Level I of JB4730-94;

[0069] Metallographic testing requirements: grain size not lower than grade 5, oxides and sulfides less than grade 2 each, total not greater than grade 3.5, non-metallic inclusions to be inspected according to JB / ZQ6122-87;

[0070] The forging ratio shall not be less than 3, and welding repair is not allowed for forging defects. All other provisions shall be implemented in accordance with the provisions of JB / ZQ6203-89.

[0071] The mechanical properties and requirements for 65Mn wound steel wire are as follows:

[0072] σb≥1620kg / cm2, δ100≥3%;

[0073] Specifications: 1.5×5 (mm), the cross-sectional dimensions should be uniform, and the rolled material shall not have cracks, folds, rust, twists, or local scratches or punctures with a depth less than the negative deviation of the cross-sectional dimensions.

[0074] Each coil of steel wire weighs ≥800kg.

[0075] Both the upper plug 61 and the lower plug 62 are made of 25Cr2Ni4MoV, high-quality alloy forgings, quenched and tempered. The mechanical properties and flaw detection requirements are as follows:

[0076] Mechanical properties: σb≥1250MPa; σs≥1100MPa; δ5≥14%; ψ≥45%; Aκ≥38J;

[0077] Ultrasonic flaw detection shall be performed in accordance with the Class I requirements of JB4730-94;

[0078] The rest shall be performed in accordance with the requirements for Grade I forgings in JB4726-2000.

[0079] Metallographic testing requirements: grain size not lower than grade 5, oxides and sulfides less than grade 2 each, total not greater than grade 3.5, non-metallic inclusions to be inspected according to JB / ZQ6122-87;

[0080] The forging ratio shall not be less than 3, and welding repair is not allowed for forging defects. All other provisions shall be implemented in accordance with the provisions of JB / ZQ6203-89.

[0081] (ii) Pressure-bearing frame 2:

[0082] The pressure-bearing frame 2 adopts a prestressed steel wire winding composite structure. The frame is composed of two left and right columns and two upper and lower semi-circular beams wound with steel wire, and can bear a load of 5542t.

[0083] The upper semi-circular block of the frame covers ≥95% of the upper and lower end caps. No gaps are allowed between the semi-circular block and the support column under maximum working pressure.

[0084] The upper and lower semi-circular beams of the frame bear the axial force transmitted by the upper plug 61 and the lower plug 62, and the joints are equipped with upper and lower bearing plates.

[0085] The load-bearing columns and semi-circular beams of the pressure frame 2 are all made of 42CrMo forgings, quenched and tempered, and their mechanical properties and flaw detection requirements are as follows:

[0086] σb≥750MPa; σS≥500MPa; δ5≥14%; ψ≥50%; Aκ≥35J.

[0087] Ultrasonic flaw detection shall be performed in accordance with Level II of NB / T47013.3-2015.

[0088] The forging ratio shall not be less than 3, and welding repair is not allowed for forging defects. All other provisions shall be implemented in accordance with the provisions of JB / ZQ6203-89.

[0089] The mechanical properties and requirements for 65Mn wound steel wire are as follows:

[0090] σb≥1620kg / cm2, δ100≥3%;

[0091] Specifications: 1.5×5 (mm), the cross-sectional dimensions should be uniform, and the rolled material shall not have cracks, folds, rust, twists, or local scratches or punctures with a depth less than the negative deviation of the cross-sectional dimensions.

[0092] Each coil of steel wire weighs ≥800kg.

[0093] (iii) The traveling mechanism drives the pressure-bearing frame 2 to move. It consists of a traveling cylinder 4, a support 1, a guide rail 5, etc.

[0094] The traveling cylinder 4 pushes the pressure-bearing frame 2 to move on the guide rail. Manual and automatic control are available.

[0095] Control points are set for movement to stop when the movement is in place, movement exceeding the limit when the movement is out of place, movement to the limit when the movement is in place, and movement exceeding the limit when the movement is in place. Non-contact proximity switches are used for control.

[0096] The lifting mechanism 63 consists of a hydraulic cylinder, a rotating sleeve, a lifting arm, etc., which drives the upper plug 61 to open and close.

[0097] The upper stopper 61 is driven by a hydraulic cylinder and a lifting arm to move in the direction of the rotating groove on the rotating cylinder. Control points are set for the upper stopper 61 to reach its lifting and lowering positions, and manual and automatic control are provided.

[0098] (iv) Hydraulic system

[0099] The hydraulic system consists of a pressurization system, a cooling, filtration and heating system, a pressure relief system, a hydraulic control system, and an oil pumping system.

[0100] The main features of this hydraulic system are: the pressurization system is divided into a booster system and a drive system, which are independent of each other, ensuring the safety and reliability of the drive pump group 12, control valve group 11, reversing cartridge valve group 111, etc.

[0101] The main pump and control pump unit 13 are both placed on the pit floor to ensure that the oil pump does not run dry, thus extending its service life and facilitating replacement and maintenance. The high-pressure oil pump and oil tank 7 are connected using a flexible connection method.

[0102] (v) Pressurization system, which realizes the main functions of press pre-pressurization, pressurization, pressure holding and pressure compensation.

[0103] The pressurization system consists of two systems:

[0104] A drive system that provides hydraulic fluid to the booster 8 and control valves is provided, with a separate oil tank 7 and system. The fluid is used solely to supply hydraulic fluid for the booster 8 and valve control fluid.

[0105] Another system is a pressurization system that replenishes and pressurizes the hydraulic oil supplied to the ultra-high pressure vessel 6.

[0106] The oil tanks 7 of the two systems are separate and do not communicate with each other, so as to ensure that the working oil in the drive oil circuit of the turbocharger 8 and the ultra-high pressure vessel 6 circulates independently, thereby ensuring the cleanliness of the oil and reducing the failure of the drive system. It can also avoid contamination caused by the rupture of the rubber sleeve inside the ultra-high pressure vessel 6 of the pressed parts.

[0107] The high-pressure booster 8 has a maximum working pressure of 400MPa. The main seal of booster 8 has a service life of ≥2 years, and its structure adopts a reciprocating plunger-type booster structure.

[0108] The through-hole high-pressure cylinder and the pull rod design of the inlet and outlet valve end caps eliminate the risk of explosion;

[0109] The reciprocating commutation adopts high-precision non-contact proximity switch control, a pressure-resistant inductive proximity switch, which is stable and reliable; it replaces the traditional strike bar signal, differential pressure signal, time signal, etc.

[0110] Equipped with a manual flow control valve, pressure sensor, and pressure gauge. The booster drive flow can be manually adjusted to change the required pressurization rate.

[0111] When the pressure is increased to 400MPa, the driving pressure is no more than 28MPa. The pressure sensor automatically detects this, and if the pressure exceeds the limit, the oil will automatically overflow back to the oil tank and the machine will stop.

[0112] The booster 8 drives an oil pump as a single pump combination, a manually operated variable pump. The required boosting speed can be changed by manually adjusting the pump flow rate.

[0113] The independent pre-pressurization pump set is a single pump combination. The starting high-pressure manual variable pump has a specification of 25ml / rpm, and the matching motor is N=5.5kW. The pre-pressurization pressure is 0-8Mpa (adjustable). After pre-pressurization is completed, oil is supplied to the high-pressure chamber 8 of the intensifier, and the intensifier pressurizes to the working pressure.

[0114] The drive system consists of a pump assembly, with the pump being a Huade hydraulic 117ml / r pump and a matching motor with N=75kW. During pressure maintenance, the pump stops working to save energy.

[0115] Pressurization process: When the pre-pressurization pressure is reached, the oil supply is reversed → the pressure is increased to the working pressure by the booster 8 → pressure is maintained (or automatic pressure compensation) → automatic pressure relief → oil extraction.

[0116] The pre-pressurization pressure is 0-8 MPa (adjustable). After pre-pressurization is completed, the oil supply to the high-pressure chamber of the steering turbocharger is controlled by the pre-pressurization valve group.

[0117] During pressure holding, if a pressure drop occurs, the booster will start working when the pressure drops to the set lower limit of the working pressure, automatically replenishing the pressure to the set working pressure value and then stopping. During the commissioning and acceptance of the press, the pressure drop should not exceed 5MPa within the 300s pressure holding time.

[0118] The high-pressure valve assembly integrates a pre-pressurization valve and a high-pressure oil inlet circuit. Its main function is to collect and divide the high and low pressure oil circuits, simplify the pipeline, and improve safety.

[0119] The pressurization system piping is connected by flanges, and the sealing structure is a metal hard seal structure.

[0120] Each oil tank 7 is equipped with a level gauge and an air filter; a sponge layer is installed between the panel and the side panel of the oil tank 7 to prevent dust from entering the oil tank 7.

[0121] The high-pressure pipeline of the whole machine is made of 30CrMnSiA forgings, which are first forged and then machined by deep hole boring to ensure safe use.

[0122] (vi) Cooling, filtration and heating systems

[0123] The press is equipped with a cooling, filtration and heating system to automatically cool, filter and heat the drive system.

[0124] The cooling heat exchanger of the drive system adopts a plate heat exchanger with high heat transfer efficiency, low heat loss, and compact structure; ensuring that the oil temperature is below 50 degrees Celsius. The factory setting is that the cooling pump starts when the temperature is ≥45℃, stops when the temperature is ≥60℃, and stops when the temperature is ≤40℃.

[0125] The oil filter is located at the oil outlet and is a high-precision combined filter with a one-way valve, with a filtration accuracy of 10 microns.

[0126] The system can be circulated and filtered during the cooling process or when the cooling water supply is stopped and cooling is not performed.

[0127] Each oil tank 7 is equipped with a heating device that automatically heats the oil when the temperature is too low, ensuring the press operates normally. The factory setting is to start at ≤5℃ and stop at ≥15℃.

[0128] (vii) Pressure relief system

[0129] It consists of a high-pressure valve group, a high-pressure proportional pressure relief group, a safety pressure relief valve, and pipelines, etc., to achieve the pressure relief process requirements.

[0130] The main feature of the proportional pressure relief valve assembly is that it achieves fully automatic and precise control of the pressure relief speed. Starting from the highest working pressure (400MPa), the pressure relief speed is automatically and precisely controlled by the PLC throughout the entire process.

[0131] Proportional control of depressurization speed has been achieved. By setting the depressurization pressure and time values ​​on the PLC, depressurization is automatically performed according to the pressure and time (speed) requirements; and segmented proportional depressurization control can be performed in combination with the requirements of the stepped curve.

[0132] The depressurization speed remains constant. This overcomes the shortcomings of the old method, where the depressurization speed varied due to differences in the volume, quantity, and compression ratio of the loaded products when pressing products of the same specification, thus strictly ensuring the pressing process of the products.

[0133] The pressure relief speed adjustment is simple and convenient, making it more suitable for the production of various products. The old-style pressure relief valve structure required manual and repeated adjustments of the throttle valve when pressing products of different materials, sizes, and shapes, which was time-consuming and labor-intensive; and it could not accurately achieve the required pressure relief speed.

[0134] The system is more reliable and stable. It fundamentally solves the main problems of high failure rate and short lifespan of old-style pressure relief valves; it can maintain reliable and stable operation for a longer period of time (more than 1 year).

[0135] The function of a high-pressure proportional pressure reducing valve is to ensure that the proportional pressure relief valve assembly is subjected to a set low pressure value (usually not higher than 28MPa) during pressurization and depressurization, so that it is not affected by the working pressure, effectively improving its service life. At the same time, it ensures that the pressure relief rate is linear (a straight line, or a curve if there is no pressure reducing valve) under fixed damping conditions during high-pressure depressurization.

[0136] The proportional pressure relief valve assembly is used to control the proportional pressure relief function throughout the entire process. It consists of a large-diameter proportional relief valve (ATOS, Italy), a hydraulic valve block, a filter, an accumulator, etc.

[0137] When depressurizing from the working pressure (not less than 10MPa) to 1.5MPa, the time can be set from 3 to 60 minutes; the depressurization can also be set in stages (factory setting 3 depressurization modes).

[0138] The high-pressure valve assembly consists of a set of hydraulically controlled safety valves, manual shut-off valves, and burst valves; it reduces high-pressure pipelines, improves safety, and reduces maintenance time. A set of hydraulically controlled pressure relief valves is used to achieve power failure or emergency pressure relief.

[0139] An emergency manual pressure relief valve and a direct-reading ultra-high pressure gauge are installed and placed on the workbench to monitor equipment operation and protect equipment safety; at the same time, they can also be used as a temporary pressure relief valve when the automatic pressure relief valve fails.

[0140] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0141] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dual-medium cold isostatic press, comprising a support (1), a pressure-bearing frame (2), and a high-pressure vessel (6), characterized in that: The support (1) is provided with a pressure-bearing frame (2) on its outside, and pressure-bearing plates (3) are provided at both the upper and lower ends of the inside of the pressure-bearing frame (2). The front end of the pressure-bearing frame (2) is provided with a traveling cylinder (4), which is used to push the pressure-bearing frame (2) to move. The pressure-bearing frame (2) is provided with a high-pressure container (6) at its rear end, and the high-pressure container (6) is installed at the rear end of the top of the support (1). The high-pressure container (6) is used for pressing the product. An oil tank (7) is provided at the rear end of the support (1), an oil pump group (9) is provided at the top of the oil tank (7), a hydraulic component is provided on the oil tank (7), a control pump group (13) is provided on one side of the rear end of the oil tank (7), and a cooling filter system (131) is provided on one side of the control pump group (13).

2. The dual-medium cold isostatic press according to claim 1, characterized in that: The bottom of the walking cylinder (4) is provided with a hinge seat one (41), the walking cylinder (4) is hinged to the hinge seat one (41), the output end of the walking cylinder (4) is hinged to a hinge seat two (42), the end of the hinge seat two (42) is fixed with a push plate (43), and the push plate (43) is fixedly connected to the pressure frame (2).

3. The dual-medium cold isostatic press according to claim 1, characterized in that: The pressure-bearing frame (2) is fixed with connecting blocks (51) on both sides. The front and rear ends of the connecting blocks (51) are fixed with sliding blocks (52). The bottom of the sliding blocks (52) is provided with guide rails (5), and the guide rails (5) are provided on both sides of the support (1). The sliding blocks (52) are slidably disposed on the guide rails (5).

4. A dual-medium cold isostatic press according to claim 1, characterized in that: The high-pressure container (6) is equipped with an oil-water isolation device (64) inside. The top of the high-pressure container (6) is equipped with an upper plug (61). A lifting mechanism (63) is provided on one side of the high-pressure container (6). The output end of the top of the lifting mechanism (63) is connected to the upper plug (61). The bottom of the high-pressure container (6) is equipped with a lower plug (62).

5. A dual-medium cold isostatic press according to claim 4, characterized in that: The oil-water separation device (64) includes a barrel opening, a separation sleeve, a barrel bottom, and a support barrel, and the upper plug (61) is equipped with an exhaust device.

6. A dual-medium cold isostatic press according to claim 1, characterized in that: The hydraulic components include a booster (8), a control valve group (11), a drive pump group (12), a control pump group (13), a second cooling and filtration system (14), and a pre-pressurization pump (15). The booster (8) is provided on one side of the oil pump group (9), the control valve group (11) is provided on one side of the rear end of the booster (8), the reversing cartridge valve group (111) is provided on the top of the control valve group (11), the drive pump group (12) is provided at the rear end of the oil tank (7), the second cooling and filtration system (14) is provided on one side of the oil tank (7), and the pre-pressurization pump (15) is provided on one side of the second cooling and filtration system (14).

7. A dual-medium cold isostatic press according to claim 6, characterized in that: The oil pump group (9) is provided with a pressure relief valve group (10) at its rear end. The pressure relief valve group (10) includes a high-pressure valve group, a high-pressure proportional pressure relief group, a safety pressure relief valve and pipelines.

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