Powder forming hydraulic press and powder hydraulic forming method

Abstract

This invention discloses a powder forming hydraulic press and a powder hydraulic forming method. The hydraulic press includes a machine body, a main cylinder, an upper slide block, and a worktable. An upper mold for pressing powder is fixed to the bottom of the upper slide block. Return supports are symmetrically arranged on the left and right sides of the upper slide block, each driven by a return cylinder. A demolding slide block is stacked above the worktable. Demolding cylinders are installed below the four corners of the worktable, and the ejector rods of each demolding cylinder are connected to the corners of the demolding slide block. A mold mounting hole is provided in the central area of ​​the demolding slide block, and a through lower mold is installed in the mold mounting hole. A feeding mechanism driven by a feeding cylinder is provided behind the demolding slide block, and a pushing mechanism driven by a pushing cylinder is provided below the feeding mechanism. The powder hydraulic forming method includes: feeding, rapid descent of the main slide block, slow descent, rapid pressurization, working feed pressurization, pressure holding, demolding, upper slide block pressure release and return, demolding slide block return, pushing, and demolding slide block falling back. This invention results in high workpiece forming efficiency and good quality.

Description

Technical Field

[0001] This invention relates to a hydraulic press, and more particularly to a powder forming hydraulic press. This invention also relates to a powder hydraulic forming method using a hydraulic press, belonging to the field of powder metallurgy forming technology. Background Technology

[0002] Traditional powder metallurgy hydraulic presses require a large demolding cylinder installed under the worktable. After the powder is hydraulically formed, the mold remains stationary, and the demolding cylinder ejects the workpiece from the mold. Because a small amount of metal powder remains after feeding and forming in powder metallurgy, this residue is difficult to remove from the mold cavity and worktable after the workpiece is ejected, affecting the next step.

[0003] Chinese invention patent CN 202498750U discloses a powder forming hydraulic press, including a frame and, from top to bottom, an upper mold plate, a female mold plate, a middle fixed mold plate, and a fixed mold plate arranged sequentially on the frame. The female mold plate is connected to a top cylinder via guide pillars, and small horizontal hydraulic cylinders are provided on both sides of the lower end face of the female mold plate. Limit blocks are connected to the ends of the small hydraulic cylinders. During pressing, the small hydraulic cylinders extend, acting as fixed limits. When the workpiece inside the female mold needs to be demolded, the small hydraulic cylinders retract, and the top cylinder connected to the female mold plate pulls the female mold plate downwards. In this way, the workpiece inside the female mold plate is ejected from the female mold cavity by the fixed lower punch, completing the demolding process.

[0004] The demolding process of this powder forming hydraulic press relies on the downward movement of the female template by the top cylinder after forming, causing the workpiece to encounter the stationary lower punch and achieve upward demolding. This demolding method has the following disadvantages: 1. The workpiece is ultimately ejected by conventional upward ejection or relative upward ejection, leaving a certain amount of powder debris in the mold cavity that is difficult to clean, requiring separate cleaning tools such as compressed air blowing; 2. The fixed template has a hole in the middle to facilitate the passage of the lower punch. During the demolding process, the remaining unformed powder falls into the fixed template and the hole in the fixed template with the vibration of the mold movement and gradually accumulates, making cleaning very difficult; 3. The falling powder will enter the guide part of the lower punch, causing the ejector rod to jam or be scratched and worn; 4. Loading and unloading are both difficult. There is an upper punch above the mold, and the entire space is very small, resulting in very little space for loading and unloading; 5. It is easy to break the workpiece. The strength of the workpiece after powder forming is not very high. If the bonding force (friction) between the workpiece and the mold cavity is too large, the lower punch can easily break the workpiece during the downward pull of the top cylinder.

[0005] In addition, the connection between the main cylinder and the upper beam of the hydraulic press is mostly achieved by installing the cylinder clamping flange. The main cylinder body is inserted into the mounting hole of the upper beam, the cylinder body clamping flange surface abuts against the bottom surface of the upper beam, and the upper surface of the upper beam is locked by a large lock nut.

[0006] For large-tonnage main cylinders, the outer diameter of the cylinder body is large. Using conventional installation methods, the corresponding mounting hole size on the upper crossbeam of the hydraulic press is also large. Combined with the size of the upper crossbeam stiffeners, this limits the reduction in the size of the hydraulic press body. The increased size of the hydraulic press leads to increased weight and higher costs. Furthermore, large cylinders are not suitable for locking with large lock nuts. The large outer diameter of a large cylinder necessitates a corresponding increase in the diameter and thickness of the lock nut, resulting in significant weight. Relying on manual rotation for locking is extremely labor-intensive, and with limited manpower, the desired locking effect is often not achieved.

[0007] Chinese invention patent CN 103769514B discloses a cylinder-driven hydraulic press, including an electrical cabinet, a forced cooler, a machine body, an upper slide block, side cylinders, an oil tank, oil supply pipelines, an operation panel, and cylinders. The electrical cabinet and forced cooler are arranged on the ground to one side of the machine body, and the oil tank is located on the upper part of the machine body. Hydraulic oil is delivered to the side cylinders and the main cylinders through the oil supply pipelines. The improvement lies in that the main cylinder body of the cylinder is integrated with the upper slide block of the hydraulic press, and the piston rod of the cylinder is fixed to the upper part of the machine body. The advantages of this invention are: the cylinders are installed in reverse, and the cylinders of the hydraulic press are installed upside down, fixing their piston rods to move the main cylinder body, which can effectively save the cylinder arrangement space; the main cylinder body of the hydraulic press is integrated with the upper slide block of the hydraulic press, reducing unnecessary connections between the upper slide block and the main cylinder body, and reducing the overall weight of the hydraulic press.

[0008] The invention patent still has the following shortcomings: 1. The slider and cylinder are welded as a single unit. Since welding requires overall tempering, the inner hole of the cylinder is inconvenient to machine, requiring a large boring and milling machine for boring. While large boring machines are generally more convenient for manufacturing large through holes, machining blind holes and the bottom R-angle is inconvenient and costly. For large hydraulic cylinders, the bottom R-angle is crucial and indispensable; as a rotating part, it can be easily machined on a lathe. 2. After the upper slider and main cylinder are welded together, repairing the main cylinder after wear is inconvenient. The entire upper slider, along with the machine body guide rails, needs to be removed before it can be moved out of the machine body. 3. The cylinder plunger is mounted in reverse on the lower surface of the upper beam through screw holes. The contact surface with the upper beam is annular. The hydraulic press body mainly bears the force on the inner reinforcing plates, while the outer reinforcing plates bear very little pressure. The area of ​​the annular contact surface is relatively small. 4. The filling valve needs to be installed in the inner hole of the upper beam. Due to the large height of the upper beam of a large hydraulic press, the installation and maintenance of the filling valve are very inconvenient. It is necessary to connect the filling valve to the plunger in advance before installation. Maintenance requires disassembling the entire upper slide block cylinder, and its filling return pipe is inconvenient to install and connect. 5. The upper beam needs to be drilled with a through hole to accommodate the filling valve, which increases the thickness of the upper beam, the size of the machine body, and the weight, thus increasing costs. Summary of the Invention

[0009] The primary objective of this invention is to overcome the problems existing in the prior art and provide a powder forming hydraulic press that facilitates demolding after powder forming and makes it easy to clean powder debris after demolding, thus restoring the cleanliness of the worktable and mold cavity.

[0010] To solve the above technical problems, the present invention provides a powder forming hydraulic press, comprising a machine body, a main cylinder, an upper slide block, and a worktable. An upper mold for pressing powder is fixed to the bottom of the upper slide block. Return supports are symmetrically arranged on the left and right sides of the upper slide block, each driven by a return cylinder. A demolding slide block is stacked above the worktable. Demolding cylinders are installed below the four corners of the worktable, and the ejector rods of each demolding cylinder are connected to the corners of the demolding slide block. A mold mounting hole is provided in the central area of ​​the demolding slide block, and a through lower mold is installed in the mold mounting hole. A feeding mechanism driven by a feeding cylinder is provided on the rear side of the demolding slide block, and a pushing mechanism driven by a pushing cylinder is provided below the feeding mechanism.

[0011] As an improvement of the present invention, the upper chamber oil port of the main cylinder is connected to the outlet of cartridge valve C305 and the inlet of cartridge valve C308, and the inlet of cartridge valve C305 is connected to the outlet of cartridge valve C304; the lower chamber oil port of the return cylinder is connected to the outlet of cartridge valve C307, the inlet of cartridge valve C307 is connected to the outlet of cartridge valve C306, and the inlets of cartridge valve C304 and cartridge valve C306 are respectively connected to pressure oil circuit one; the outlet of cartridge valve C306 is also connected to the inlets of cartridge valve C301 and cartridge valve C302, and the outlets of cartridge valve C301, cartridge valve C302 and cartridge valve C308 are all connected to the oil tank.

[0012] As a further improvement of the present invention, the rodless chamber of the feeding cylinder is connected to the outlet of cartridge valve C201 and the inlet of cartridge valve C203, the inlets of cartridge valve C201 and cartridge valve C202 are connected to the pressure oil circuit, and the outlet of cartridge valve C202 is connected to the rod chamber of the feeding cylinder and the inlet of cartridge valve C204.

[0013] The hydraulic control port of cartridge valve C201 is connected to the middle port of shuttle valve S2. The left inlet of shuttle valve S2 is connected to the outlet of cartridge valve C201, and the right inlet of shuttle valve S2 is connected to port A of solenoid valve Y201. The hydraulic control port of cartridge valve C202 is connected to the middle port of shuttle valve S3. The left inlet of shuttle valve S3 is connected to the outlet of cartridge valve C202, and the right inlet of shuttle valve S3 is connected to port A of solenoid valve Y202. The hydraulic control port of cartridge valve C204 is connected to the inlets of pressure regulating valves F202 and F203. The outlet of pressure regulating valve F202 is connected to port B of solenoid valve Y202, and the outlet of pressure regulating valve F203 is connected to the outlet of cartridge valve C204. Solenoid valves Y201 and Y202 are both two-position four-way valves, and their P ports are both connected to pressure oil circuit 1, while their T ports are both connected to the oil tank.

[0014] As a further improvement of the present invention, the lower chamber of each of the demolding cylinders is connected to the outlet of cartridge valve C501 and the inlet of cartridge valve C503, the upper chamber of each of the demolding cylinders is connected to the outlet of cartridge valve C502 and the inlet of cartridge valve C504, the inlets of cartridge valve C501 and cartridge valve C502 are connected to pressure oil circuit one, and the outlets of cartridge valve C503 and cartridge valve C504 are connected to oil tank.

[0015] As a further improvement of the present invention, the rodless chamber of the pusher cylinder is connected to the outlet of cartridge valve C401 and the inlet of cartridge valve C403, the inlets of cartridge valve C401 and cartridge valve C402 are connected to the first pressure oil circuit, and the outlet of cartridge valve C402 is connected to the rod chamber of the pusher cylinder and the inlet of cartridge valve C404.

[0016] The hydraulic control port of cartridge valve C401 is connected to the middle port of shuttle valve S4. The left inlet of shuttle valve S4 is connected to the outlet of cartridge valve C401, and the right inlet of shuttle valve S4 is connected to port A of solenoid valve Y401. The hydraulic control port of cartridge valve C402 is connected to the middle port of shuttle valve S5. The left inlet of shuttle valve S5 is connected to the outlet of cartridge valve C402, and the right inlet of shuttle valve S5 is connected to port A of solenoid valve Y402. The hydraulic control port of cartridge valve C404 is connected to the inlets of pressure regulating valves F402 and F403. The outlet of pressure regulating valve F402 is connected to port B of solenoid valve Y402, and the outlet of pressure regulating valve F403 is connected to the outlet of cartridge valve C404. Solenoid valves Y401 and Y402 are both two-position four-way valves, with their P ports connected to pressure oil circuit 1 and their T ports connected to the oil tank.

[0017] As a further improvement of the present invention, the first pressure oil circuit is supplied with oil by two tandem pumps, the second pressure oil circuit is supplied with oil by one tandem pump, and one end of the second pressure oil circuit is connected to the first pressure oil circuit through a cartridge valve C118.

[0018] The other end of the pressure oil circuit 2 is connected to the inlet of cartridge valve C113, the outlet of cartridge valve C113 is connected to the inlet of cartridge valve C114, the outlet of cartridge valve C114 is connected to the oil pipe inlet of the large accumulator and the inlet of cartridge valve C115, and the outlet of cartridge valve C115 is connected to the oil tank.

[0019] The oil pipe outlet of the large accumulator is connected to port A of the proportional flow valve YAA via cartridge valve C116. Port B of the proportional flow valve YAA is connected to the rapid pressurization oil circuit via cartridge valve C117. The outlet of the rapid pressurization oil circuit is connected to the upper chamber oil port of the master cylinder.

[0020] As a further improvement of the present invention, the first pressure oil circuit is also connected to port B of the electromagnetic unloading valve Y108, and the second pressure oil circuit is also connected to port B of the electromagnetic unloading valve Y107; the hydraulic control port of the cartridge valve C118 is connected to port A of the electromagnetic valve Y109, the P port of the electromagnetic valve Y109 is connected to the middle port of the shuttle valve S7, and the left and right ends of the shuttle valve S7 are respectively connected to the first pressure oil circuit and the second pressure oil circuit; the hydraulic control port of the cartridge valve C113 is connected to port A of the electromagnetic valve Y110, and the P port of the electromagnetic valve Y110 is connected to the pressure... Oil circuit one; the hydraulic control port of the cartridge valve C115 is connected to port B of the solenoid ball valve Y111, and port P of the solenoid ball valve Y111 is connected to the outlet of the cartridge valve C115; the hydraulic control port of the cartridge valve C116 is connected to port A of the solenoid valve Y112, and port P of the solenoid valve Y112 is connected to the oil pipe outlet of the large accumulator; the solenoid unloading valves Y107, Y108, Y109, Y110, Y111, and Y112 are all two-position four-way valves and their T ports are all connected to the oil tank.

[0021] As a further improvement of the present invention, an auxiliary energy storage module CF6 is also provided. The auxiliary energy storage module CF6 includes a charging pump P7, a medium-pressure small energy storage device, and a low-pressure small energy storage device. The outlet oil circuit of the charging pump P7 is connected to the inlet of the cartridge valve C602 and the inlet of the cartridge valve C603, respectively. The outlet of the cartridge valve C602 is connected to the oil port of the medium-pressure small energy storage device through a check valve. The oil port of the medium-pressure small energy storage device is connected to the control port of the proportional flow valve YAA through a check valve and an independent control oil circuit.

[0022] The outlet of cartridge valve C603 is connected to the oil port of the low-pressure small accumulator and the P port of solenoid valve Y607 via a check valve. The B port of solenoid valve Y607 is connected to the hydraulic control port of each filling valve. The hydraulic control port of cartridge valve C602 is connected to the A port of solenoid valve Y602, and the P port of solenoid valve Y602 is connected to the inlet of cartridge valve C602. The hydraulic control port of cartridge valve C603 is connected to the A port of solenoid valve Y603, and the P port of solenoid valve Y603 is connected to the inlet of cartridge valve C603. Solenoid valves Y602, Y603, and Y607 are all two-position four-way valves, and their T ports are all connected to the oil tank.

[0023] As a further improvement of the present invention, the feeding mechanism further includes a hopper and feeding guide rods. The lower end of the hopper is located on the feeding support plate. A hopper connecting plate is fixed to the rear side wall of the hopper. The middle part of the hopper connecting plate is connected to the front end of the piston rod of the feeding cylinder. The feeding cylinder is fixed on the feeding cylinder support. The bottom of the feeding cylinder support is fixed on the feeding support plate. Feeding guide rods are symmetrically connected to both sides of the hopper connecting plate. The feeding guide rods pass through the feeding guide sleeves respectively. The feeding guide sleeves are fixed on the feeding cylinder support respectively. The feeding support plate is spliced ​​to the rear side of the demolding slider, and the top surfaces of the two are flush.

[0024] Another objective of this invention is to overcome the problems existing in the prior art and provide a powder hydroforming method with high working efficiency and reliable forming quality.

[0025] To solve the above technical problems, the present invention provides a powder hydraulic forming method, using a powder forming hydraulic press as described in any one of claims 1 to 9, comprising the following steps in sequence:

[0026] S1. The powder material is loaded into the hopper, and the feeding cylinder drives the hopper to move forward to above the demolding slider, so that the powder material falls into the lower mold.

[0027] S2. The feeding cylinder pulls the hopper away from the demolding slider and retracts to the initial position;

[0028] S3. Pressure oil enters the upper chamber of the main cylinder, pushing the main slider to descend rapidly to the shift point, and each filling valve opens to replenish oil to the upper chamber of the main cylinder.

[0029] S4. The upper slider slowly descends until the upper mold contacts the powder material;

[0030] S5. The upper slider is rapidly pressurized, and the large accumulator participates in supplying oil to the upper chamber of the main cylinder through the proportional flow valve, so as to initially press the powder material into shape.

[0031] S6. The upper slider feeds and presses the powder workpiece to completely compress it into shape.

[0032] S7. Upper slider maintains pressure;

[0033] S8. Each demolding cylinder drives the demolding slider to move upward a certain distance, so that the lower mold separates from the workpiece. During the demolding process, the upper slider remains pressed and stationary.

[0034] S9. The pressure in the upper chamber of the main cylinder drops to zero, causing the upper slider to release pressure.

[0035] S10, the return cylinder pushes the upper slider upwards for a rapid return stroke, and the upper chamber of the main cylinder returns oil to the filling tank through the filling valve;

[0036] S11. Each demolding cylinder continues to drive the demolding slider to return upward until the material ejection space is made available;

[0037] S12, the pusher cylinder drives the pusher plate to push forward, pushing all the workpiece and scattered powder away from the worktable;

[0038] S13. The pusher cylinder pulls the push plate backward to return to its original position;

[0039] S14. All demolding cylinders work together to pull the demolding slider back onto the worktable, waiting for the next feeding cycle.

[0040] Compared with the prior art, the present invention has achieved the following beneficial effects: 1. The rated flow of the servo pump set double pump is matched with a 1:1 ratio, the maximum working pressure of low pressure is 15MPa, and the maximum working pressure of high pressure is 30MPa, which conforms to the law of the pressing force stroke curve of powder molding, makes full use of the power of the servo motor, and improves the speed of high pressure pressing.

[0041] 2. Due to the large compression volume, long pressing stroke, and low initial pressing force of the powder material from a loose state to a preliminary formed state, a servo motor-driven dual pump and a large accumulator are used to jointly drive the upper slide block for rapid pressurization. The pressurized oil stored in the large accumulator enters the upper chamber of the main cylinder through the rapid pressurization oil circuit for auxiliary rapid pressurization, which can greatly improve the pressurization efficiency. A proportional flow valve is introduced to control the rapid pressurization oil circuit of the large accumulator, which increases the pressing speed in the low-pressure forming stage while avoiding the impact caused by the instantaneous release of pressure in the large accumulator.

[0042] 3. The accumulator is filled with liquid to store energy, making full use of the characteristics of multiple auxiliary actions, long time and small flow required. The pump source circuit is set with isolation treatment, which can split and merge the flow of the servo pump group. Without adding oil pump motor group, the flow of one of the oil pump motor groups can be separated and supplied to the large accumulator for filling. It can also participate in the main cylinder pressurization or other auxiliary actions, increasing the flexibility of molding control.

[0043] 4. The accumulator rapid pressurization oil circuit controlled by the proportional flow valve greatly eliminates the hydraulic shock of opening the cartridge valve under high pressure, while also enabling flow rate control with high flexibility.

[0044] 5. The auxiliary energy storage module incorporates two types of small accumulators with different pressures and volumes. The medium-pressure accumulator provides a stable and clean external control pressure of 14MPa to the hydraulic control port of the proportional flow valve, ensuring stable operation. The low-pressure accumulator controls the filling valve, enabling constant pressure control. When there are many filling valves with large diameters, a large flow rate is required. Direct pump control would increase pump flow rate and motor power, and also introduce asynchronous valve core movements. Using a low-pressure accumulator to control the filling significantly reduces the size of the motor and pump, fully utilizing the remaining operating time for filling and storing energy in the low-pressure accumulator. The accumulator-controlled filling valve output has a large flow rate and fast response.

[0045] 6. The pump source block is equipped with an electromagnetic unloading valve. When the pump and the solenoid valve are closed, pressure will be generated in the oil passage of the cartridge valve block, which may easily cause malfunction and increase maintenance risks. When the motor stops or the solenoid valve is de-energized, the pump source circuit will be automatically connected to the oil tank to realize automatic pressure relief of the pump source and eliminate safety hazards.

[0046] 7. After the powder is pressed into shape, while keeping the upper slider pressed, the demolding slider can be pushed upward to separate the mold cavity from the workpiece. Excess powder will fall onto the worktable, and the pushing mechanism can push the workpiece and debris away from the worktable together to prevent debris from crushing or scratching the working surface when the demolding slider falls.

[0047] 8. The upper slider quickly descends to the speed change point, saving time, and the preset return cylinder back pressure ensures rapid back pressure when the slider reaches the speed change point.

[0048] 9. The demolding slider should demold first, and wait for the upper slider to depressurize and return before moving upward to its final position. This allows space for the pusher plate to clean up and avoids interference between the demolding slider and the upper slider.

[0049] 10. The plunger of the main cylinder remains stationary, while the main cylinder body moves up and down with the upper slider. The top of the plunger is connected to the upper crossbeam through the cylinder head, which greatly reduces the size of the upper crossbeam in the front-to-back direction, which is beneficial to reducing the overall size and weight of the hydraulic press. The square cylinder head has a large contact area, which distributes the pressing force more evenly, and the upper beam is subjected to uniform force, resulting in good force distribution on the hydraulic press.

[0050] 11. The main cylinder body and the upper slide block are manufactured separately. The main cylinder body is installed inside the upper slide block, with its bottom abutting against the upper surface of the upper slide block's base plate. This reduces the equipment height and avoids stress concentration at the contact point between the upper slide block and the cylinder. The square cylinder head can be equipped with at least two filling valves at the front and rear. The return oil pipes of the filling valves are externally connected to the upper oil tank for convenient maintenance. Attached Figure Description

[0051] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The drawings are provided for reference and illustration only and are not intended to limit the present invention.

[0052] Figure 1 This is a front view of the powder forming hydraulic press of the present invention;

[0053] Figure 2 for Figure 1 The left view;

[0054] Figure 3 This is a perspective view of the demolding slider in this invention;

[0055] Figure 4 This is a perspective view of the feeding mechanism in this invention;

[0056] Figure 5 This is a perspective view of the feeding mechanism in this invention;

[0057] Figure 6 This is a front view of the main cylinder in this invention;

[0058] Figure 7 for Figure 6 Top view;

[0059] Figure 8 This is a top enlarged view of the main cylinder installed in the upper slider in this invention;

[0060] Figure 9 This is a hydraulic schematic diagram of the powder forming hydraulic press of the present invention;

[0061] In the diagram: 1. Hydraulic pump station; 2. Return oil pipe; 3. Air filter; 4. Filling tank; 5. Filling pipe; 6. Machine body; 7. Filling valve; 8. Main cylinder; 8a. Cylinder head; 8a1. Filling valve mounting hole; 8a2. Filling hole; 8a3. Cylinder head sealing ring; 8a4. Cylinder head and plunger fixing bolts; 8a5. Main cylinder and upper beam connecting bolt holes; 8b. Plunger; 8b1. Plunger inner hole; 8c. Main cylinder body; 8c1. Main cylinder body lug; 8d. Clamping flange; 8d 1. Clamping flange stud; 8d2. Pressure ring; 8d3. Dustproof ring; 8d4. Adjusting shim; 8e. Upper pressure sleeve; 8f. V-type combination seal ring; 8g. Guide sleeve; 9. Upper slider; 9a. Upper slider guide rail; 9b. Return cylinder bracket; 10. Slider platform plate; 11. Machine body guide rail; 12. Demolding slider; 12a. Mold mounting hole; 12b. Ejector rod fixing hole; 12c. Lifting hole; 12d. Demolding slider guide rail; 12e. Copper guide plate; 13. 14. Thrust joint bearing; 15. Demolding cylinder; 16. Foundation; 17. Hydraulic safety bolt; 18. Thrust joint bearing; 19. Return cylinder; 20. Feeding mechanism; 20a. Hopper; 20b. Hopper connecting plate; 20c. Feeding support plate; 20d. Feeding cylinder support; 20e. Feeding cylinder; 20f. Pipe clamp; 20g. Feeding guide rod; 20h. Feeding guide sleeve; 20j. Feeding guide rod connecting plate; 20k. Feeding signal bracket; 20m 21. Welding backing plate; 21. Pushing mechanism; 21a. Pushing plate; 21b. Pushing cylinder; 21c. Pushing guide rod; 21d. Pushing guide sleeve; 21e. Pushing cylinder bracket; 21f. Pushing guide rod connecting plate; 21g. Pushing base; 21h. Pushing signal bracket; 22. Locking cylinder; G1. Pressure oil circuit one; G2. Pressure oil circuit two; G3. Rapid pressurization oil circuit; AC1. Large accumulator; AC2. Medium-pressure small accumulator; AC3. Low-pressure small accumulator. Detailed Implementation

[0062] In the following description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not mean that the device must have a specific orientation.

[0063] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention.

[0065] like Figures 1 to 3 As shown, the powder forming hydraulic press of the present invention includes a machine body 6, an upper slide block 9, a main cylinder 8, and a worktable 13. The bottom of the machine body 6 is fixed to the foundation 16 by ground anchor bolts. The filling tank 4 is fixed to the top of the machine body 6 by a filling tank bracket. An air filter 3 is installed at the top vent of the filling tank 4. The filling tank 4 has two filling holes at the front and rear bottom, which are connected to the oil suction port of the filling valve 7 through butterfly valve pipelines. Oil is added when the main cylinder 8 descends quickly and drained quickly when the slide block returns. There is a return oil hole at a certain height on the side of the filling tank 4. The return oil hole is connected to the oil tank of the hydraulic pump station 1 through a large-diameter return oil pipe 2. When the slide block returns, a large amount of oil from the main cylinder 8 returns to the filling tank 4, and the excess oil overflows back to the pump station oil tank through the filling pipe 5.

[0066] The bottom of the upper slider 9 is fixed with a slider platform plate 10. The slider platform plate 10 has a T-shaped groove and a mold for pressing powder is fixed thereon. Symmetrical return supports are provided on the left and right sides of the upper slider 9, and the two return supports are respectively connected to the top of the return plunger of the return cylinder 19. The machine body 6 is made of multiple steel plates stacked and welded together. The return cylinder 19 is installed in a recess in the machine body 6. A thrust joint bearing 18 is provided between the return plunger of the return cylinder 19 and the return support, which can eliminate the lateral force on the guide part of the piston rod of the return cylinder due to off-center load or installation error, and also reduce the requirements for the installation position dimensions. A hydraulic safety bolt 17 is installed in the U-shaped hole on the return support, and the hydraulic safety bolt 17 is driven by a locking cylinder 22.

[0067] The upper slider 9 is provided with upper slider guide rails at its four corners. Each upper slider guide rail cooperates with the body guide rail 11 to control the stability of the upper slider 9's lifting and lowering.

[0068] A demolding slider 12 is stacked on top of the workbench 13. Demolding cylinders 15 are installed at the lower part of each of the four corners of the workbench 13. Ejector rod fixing holes 12b are provided at each of the four corners of the demolding slider 12. The ejector rods of each demolding cylinder 15 pass through the workbench 13 and are fixed in the ejector rod fixing holes 12b at the corners of the demolding slider 12. A thrust joint bearing 14 is provided between the ejector rod of the demolding cylinder 15 and the corner of the demolding slider 12 to eliminate lateral forces on the piston rod guide of the demolding cylinder due to off-center loading or installation errors. Demolding slider guide rails 12d are provided at each of the four outer corners of the demolding slider 12. A copper guide plate 12e is fixed to the working surface of the demolding slider guide rail 12d, which cooperates with the machine body guide rail 11. Lifting holes 12c extending laterally are symmetrically provided on the sidewalls of the demolding slider 12 for easy lifting of the demolding slider 12 during installation.

[0069] The central area of ​​the demolding slider 12 is provided with a mold mounting hole 12a, in which a through lower mold is installed, and the flange of the lower mold is fixed on the inner step of the mold mounting hole 12a.

[0070] A feeding mechanism 20 is provided on the rear side of the demolding slider 12, and a pushing mechanism 21 is provided on the rear side of the demolding slider 12 and below the feeding mechanism 20.

[0071] like Figure 4 As shown, the feeding mechanism 20 includes a hopper 20a, a feeding cylinder 20e, and a feeding guide rod 20g. The lower end of the hopper 20a is located on the feeding support plate 20c to receive powder material. A hopper connecting plate 20b is fixed to the rear side wall of the hopper 20a. The middle part of the hopper connecting plate 20b is connected to the front end of the piston rod of the feeding cylinder 20e. The front end of the feeding cylinder 20e is fixed to the feeding cylinder support 20d, and the rear end is fixed to the feeding support plate 20c by a pipe clamp 20f. The bottom of the feeding cylinder support 20d is fixed to a welding pad 20m, and the welding pad 20m is fixed to the feeding support plate 20c.

[0072] The feeding support plate 20c is spliced ​​to the rear side of the demolding slider 12, and the top surfaces of the two are flush. Feeding guide rods 20g are symmetrically connected to both sides of the hopper connecting plate 20b. The feeding guide rods 20g pass through the feeding guide sleeves 20h respectively, and the feeding guide sleeves 20h are fixed on the feeding cylinder support 20d respectively. During the translation of the hopper 20a driven by the feeding cylinder 20e, the two feeding guide rods 20g ensure the accuracy of its direction.

[0073] like Figure 5As shown, the pushing mechanism 21 includes a pushing plate 21a, a pushing cylinder 21b, and pushing guide rods 21c. The middle part of the pushing plate 21a is connected to the front end of the piston rod of the pushing cylinder 21b. The pushing cylinder 21b is fixed on the pushing cylinder bracket 21e, and the bottom of the pushing cylinder bracket 21e is fixed on the pushing base 21g. The two pushing guide rods 21c are symmetrically located on both sides of the pushing cylinder 21b. The two pushing guide rods 21c pass through the pushing guide sleeves 21d and are connected to the pushing plate 21a. The pushing guide sleeves 21d are fixed on the pushing cylinder brackets 21e.

[0074] The powder material falls into the hopper 20a through the conveying device. The piston rod of the feeding cylinder 20e extends and pushes the hopper 20a forward until the lower port of the hopper is aligned with the mold mounting hole 12a of the demolding slider 12. The powder material in the hopper 20a falls into the mold cavity. Then the piston rod of the feeding cylinder 20e retracts and pulls the hopper 20a back to the outside of the demolding slider 12.

[0075] The rear ends of the two feeding guide rods 20g are connected to each other by an arc-shaped feeding guide rod connecting plate 20j. This improves the strength and operational stability of the two feeding guide rods 20g, and one end of the feeding guide rod connecting plate 20j extends outward to form a feeding signaling end. A feeding signal bracket 20k is provided parallel to the outer side of one of the feeding guide rods 20g. The feeding signal bracket 20k is equipped with a feeding post limit proximity switch SQ6, a feeding working position proximity switch SQ7, and a feeding limit position proximity switch SQ8 to detect the position of the feeding signaling end, and sends the position signal of the feeding cylinder 20e to the control system.

[0076] After the material is fed, the upper slider 9 quickly descends and applies pressure to press the powdered raw material into a workpiece. Then, the upper slider 9 holds the workpiece still, and the ejector rod of the demolding cylinder 15 extends, pushing the demolding slider 12 upward, so that the formed workpiece is removed from the mold cavity and demolded.

[0077] After demolding, the piston rod of the pusher cylinder 21b, installed on the rear side of the machine body worktable 13, extends and pushes the workpiece to the outside of the machine body. The lower edge of the pusher plate 21a abuts against the surface of the worktable 13, and the length of the pusher plate 21a is greater than the length of the worktable 13; during the pushing process, the material scattered on the worktable 13 is scraped out of the machine body to prevent debris from crushing or scratching the working surface when the demolding slider 12 falls between it and the worktable 13.

[0078] The rear ends of the two pusher guide rods 21c are connected by a pusher guide rod connecting plate 21f, one end of which extends outward to form a feeding signal end. A pusher signal bracket 21h parallel to the outer side of one of the two pusher guide rods 21c is provided.

[0079] The pusher signal bracket 21h is equipped with a pusher rear limit proximity switch SQ9, a pusher working position proximity switch SQ10, and a pusher limit position proximity switch SQ11 to detect the position of the pusher signal end, so as to monitor the position of the piston rod of the pusher cylinder 21b.

[0080] like Figures 6 to 8 As shown, the main cylinder 8 includes a main cylinder body 8c that is closed at the lower end. A plunger 8b is provided inside the main cylinder body 8c. The plunger 8b has a hollow structure and a through-hole 8b1 along its axis. A square cylinder head 8a is fixed to the upper end of the plunger 8b. The cylinder heads and plunger fixing bolts 8a4 are distributed on the same circumference. A circular cylinder head boss is provided at the center of the lower end face of the cylinder head 8a. The cylinder head boss is embedded in the upper end step of the plunger's inner hole 8b1 to achieve accurate positioning. Two cylinder head sealing rings 8a3 are embedded on the circumference of the cylinder head boss. The cylinder head sealing rings 8a3 are O-rings that seal with the plunger's inner hole 8b1.

[0081] The cylinder head 8a has symmetrical filling valve mounting holes 8a1 at its front and rear ends. Filling valves 7 are installed in the two filling valve mounting holes 8a1 respectively. The bottom of the two filling valve mounting holes 8a1 are connected to the central filling blind hole through coaxial filling holes 8a2 respectively. The filling holes 8a2 and the central filling blind hole are connected in a T-shape. The lower end of the central filling blind hole is connected to the plunger inner hole 8b1, which facilitates the oil from the upper oil tank to enter the main cylinder 8c or return oil to the upper oil tank.

[0082] The cylinder head 8a has multiple high-pressure oil inlets on its side. The outlet of each high-pressure oil inlet is located on the lower end face of the cylinder head boss, so that each high-pressure oil inlet is connected to the inner hole of the plunger, so as to pressurize the inner cavity of the plunger 8b and the main cylinder 8c.

[0083] A guide sleeve 8g is provided between the upper inner wall of the main cylinder 8c and the outer wall of the plunger 8b. The upper outer step of the guide sleeve 8g is embedded in the inner step of the valve body, realizing the axial positioning between the guide sleeve 8g and the main cylinder 8c. The inner wall of the guide sleeve 8g is precisely matched with the outer wall of the plunger 8b to ensure the accuracy of the direction when the plunger 8b rises and falls. The main feature is that the main cylinder 8c moves while the plunger 8b remains stationary.

[0084] A V-shaped combined sealing ring 8f is pressed onto the top of the guide sleeve 8g. The V-shaped combined sealing ring 8f is pressed tightly by the upper pressure sleeve 8e above it. The top of the upper pressure sleeve 8e is embedded in the inner step of the clamping flange 8d. The clamping flange 8d is fixed to the upper end of the main cylinder body 8c by the clamping flange stud 8d1. The guide sleeve 8g can be integrated with the main cylinder body 8c or machined as a single piece. The upper pressure sleeve 8e can be integrated with the clamping flange 8d or machined as a single piece.

[0085] An adjusting shim 8d4 is provided between the bottom of the clamping flange 8d and the upper end face of the main cylinder 8c, and each clamping flange stud 8d1 passes through the adjusting shim 8d4. The adjusting shim 8d4 can be made into a U-shape with different thicknesses and one end open, so that it can be easily removed after the sealing ring wears out, and re-tightening can achieve a better seal and a longer service life; or multiple adjusting shims 8d4 can be stacked when replacing a new sealing ring, so that it can be easily removed after the sealing ring wears out.

[0086] V-shaped combination sealing ring 8f includes multiple V-shaped rings stacked in sequence, with the lip of each V-shaped ring opening downwards. The bottom V-shaped ring is supported above the bottom support, and the bottom of the bottom support abuts against the top of the guide sleeve 8g; the top V-shaped ring abuts against the bottom of the top support, and the top support abuts against the bottom of the upper pressure sleeve 8e.

[0087] A dustproof ring 8d3 is embedded in the inner edge of the upper port of the clamping flange 8d to prevent dust from entering. Above the dustproof ring 8d3 is a pressure ring 8d2, which is fixed to the upper end face of the clamping flange 8d by screws.

[0088] The cylinder head 8a has bolt holes 8a5 on both the front and rear sides for connecting the main cylinder and the upper beam, and is fixedly connected to the upper crossbeam by bolts. This bolted connection between the cylinder head 8a and the upper beam eliminates the need for large holes for cylinder installation on the upper beam of the machine body, significantly reducing the machine's front-to-back dimensions and thus substantially reducing the weight of the hydraulic press, saving raw materials, and lowering production costs. Furthermore, this structure increases the stress-bearing area between the cylinder head 8a and the upper beam, which helps reduce stress concentration on the upper beam, resulting in a higher strength than a conventionally perforated upper beam structure.

[0089] The main cylinder body 8c is embedded in the mounting hole of the upper slider 9, and the entire main cylinder body 8c is installed inside the upper slider 9, reducing the installation height space. Conventional upper sliders have supporting ribs at the bottom of the connection between the upper slider and the cylinder, but this upper slider does not. The bottom wall of the main cylinder body 8c abuts against the working base plate of the upper slider 9; the working base plate of the upper slider 9 contacts the bottom plate of the main cylinder body, and the pressure center is exactly at the center of the upper slider. Due to the force on the bottom of the cylinder, the contact area is increased compared to the conventional hydraulic cylinder piston rod or plunger rod connection structure with the upper slider, resulting in a larger force-bearing surface during operation, which helps reduce the stress on the upper slider 9 and the plunger cylinder.

[0090] Multiple main cylinder lugs 8c1 are evenly welded to the outer periphery of the middle part of the main cylinder body 8c. Each main cylinder lug 8c1 has a through hole and is fixed to the upper surface of the upper slider 9 by double-ended studs, making operation very convenient. The four corners of the upper slider 9 move up and down along the upper slider guide rail 9a to ensure the stability of the upper slider 9 during lifting and lowering.

[0091] The upper slider 9 is symmetrically mounted with return cylinder brackets 9b on both sides by screws. The return cylinder brackets 9b abut against the machined steps on the side of the upper slider. The return cylinder brackets 9b are connected to the piston rod of the return cylinder, which pushes the upper slider back in the opposite direction. The return cylinder brackets 9b can also be connected to hydraulic safety bolts for locking the upper slider.

[0092] like Figure 9 As shown, the hydraulic system of the powder forming hydraulic press includes a pump source module CF1, a feeding control module CF2, an upper slider control module CF3, a pushing control module CF4, a demolding slider control module CF5, and an auxiliary energy storage module CF6.

[0093] The pump power module CF1 includes a dual low-pressure pump P1 and a dual high-pressure pump P2 driven by motor M1; a dual low-pressure pump P3 and a dual high-pressure pump P4 driven by motor M2; and a dual low-pressure pump P5 and a dual high-pressure pump P6 driven by motor M3. The operating pressure of dual low-pressure pumps P1, P3, and P5 is 0-15 MPa, and the operating pressure of dual high-pressure pumps P2, P4, and P6 is 0-30 MPa.

[0094] Pressure oil circuit 1 G1 is supplied with oil by a combination of a dual low-pressure pump P3 and a dual high-pressure pump P4, and a combination of a dual low-pressure pump P5 and a dual high-pressure pump P6. Pressure oil circuit 2 G2 is supplied with oil by a combination of a dual low-pressure pump P1 and a dual high-pressure pump P2.

[0095] The outlet of the dual low-pressure pump P1 is connected to the inlet of cartridge valve C101 and one-way cartridge valve C102. The hydraulic control port of cartridge valve C101 is controlled by port B of solenoid valve Y101.

[0096] The outlet of the dual high-pressure pump P2 is connected to the inlet of cartridge valve C104 and one-way cartridge valve C103. The hydraulic control port of cartridge valve C104 is controlled by port B of solenoid valve Y102.

[0097] The outlet of the dual low-pressure pump P3 is connected to the inlet of cartridge valve C105 and one-way cartridge valve C106. The hydraulic control port of cartridge valve C105 is controlled by port B of solenoid valve Y103.

[0098] The outlet of the dual high-pressure pump P4 is connected to the inlet of cartridge valve C108 and one-way cartridge valve C107. The hydraulic control port of cartridge valve C108 is controlled by port B of solenoid valve Y104.

[0099] The outlet of the dual low-pressure pump P5 is connected to the inlet of cartridge valve C109 and one-way cartridge valve C110. The hydraulic control port of cartridge valve C109 is controlled by port B of solenoid valve Y105.

[0100] The outlet of the dual high-pressure pump P6 is connected to the inlet of cartridge valve C112 and one-way cartridge valve C111. The hydraulic control port of cartridge valve C112 is controlled by port B of solenoid valve Y106.

[0101] Pressure oil circuit 2 G2 is also connected to port B of electromagnetic unloading valve Y107. Electromagnetic unloading valve Y107 is a two-position four-way valve and its port T is connected to the oil tank. The moment motor M1 stops, electromagnetic unloading valve Y107 is de-energized, and port B and port T are connected, automatically connecting pressure oil circuit 2 G2 to the oil tank to achieve automatic pressure relief and eliminate safety hazards.

[0102] Pressure oil circuit G1 is also connected to port B of electromagnetic unloading valve Y108. Electromagnetic unloading valve Y108 is a two-position four-way valve with port T connected to the oil tank. When motors M2 and M3 stop, electromagnetic unloading valve Y108 is de-energized, and port B and port T are connected, automatically connecting pressure oil circuit G1 to the oil tank to achieve automatic pressure relief and eliminate safety hazards.

[0103] One end of pressure oil circuit 2 G2 is connected to pressure oil circuit 1 G1 through cartridge valve C118. The hydraulic control port of cartridge valve C118 is connected to port A of solenoid valve Y109. The port P of solenoid valve Y109 is connected to the middle port of shuttle valve S7. The left and right ends of shuttle valve S7 are connected to pressure oil circuit 1 G1 and pressure oil circuit 2 G2 respectively.

[0104] The other end of pressure oil circuit G2 is connected to the inlet of cartridge valve C113. The outlet of cartridge valve C113 is connected to the inlet of cartridge valve C114. The outlet of cartridge valve C114 is connected to the oil pipe inlet of large accumulator AC1 and the inlet of cartridge valve C115. The outlet of cartridge valve C115 is connected to the oil tank. Each large accumulator AC1 has a volume of 100L, and there are four in total. The nitrogen filling pressure is 10MPa, the minimum working pressure is 11MPa, and the maximum working pressure is 15MPa.

[0105] The oil pipe outlet of the large accumulator AC1 is connected to port A of the proportional flow valve YAA through cartridge valve C116. Port B of the proportional flow valve YAA is connected to the rapid pressurization oil circuit G3 through cartridge valve C117. The outlet of the rapid pressurization oil circuit G3 is connected to the upper chamber oil port of the master cylinder 8.

[0106] The hydraulic control port of cartridge valve C113 is connected to port A of solenoid valve Y110, and port P of solenoid valve Y110 is connected to pressure oil circuit G1.

[0107] The hydraulic control port of cartridge valve C115 is connected to port B of solenoid ball valve Y111, and port P of solenoid ball valve Y111 is connected to the outlet of cartridge valve C115.

[0108] The hydraulic control port of cartridge valve C116 is connected to port A of solenoid valve Y112, and port P of solenoid valve Y112 is connected to the oil pipe outlet of the large accumulator.

[0109] Solenoid valves Y109, Y110, Y111, and Y112 are all two-position four-way valves, and their T ports are all connected to the oil tank.

[0110] In the feeding control module CF2: the rodless chamber of the feeding cylinder 20e is connected to the outlet of cartridge valve C201 and the inlet of cartridge valve C203. The inlets of cartridge valve C201 and cartridge valve C202 are connected to the pressure oil circuit G1. The outlet of cartridge valve C202 is connected to the rod chamber of the feeding cylinder 20e and the inlet of cartridge valve C204.

[0111] The hydraulic control port of cartridge valve C201 is connected to the middle port of shuttle valve S2, the left inlet of shuttle valve S2 is connected to the outlet of cartridge valve C201, and the right inlet of shuttle valve S2 is connected to port A of solenoid valve Y201.

[0112] The hydraulic control port of cartridge valve C202 is connected to the middle port of shuttle valve S3, the left inlet of shuttle valve S3 is connected to the outlet of cartridge valve C202, and the right inlet of shuttle valve S3 is connected to port A of solenoid valve Y202.

[0113] The hydraulic control port of cartridge valve C204 is connected to the inlet of pressure regulating valves F202 and F203. The outlet of pressure regulating valve F202 is connected to port B of solenoid valve Y202. The outlet of pressure regulating valve F203 is connected to the outlet of cartridge valve C204. Solenoid valves Y201 and Y202 are both two-position four-way valves, and their P ports are both connected to pressure oil circuit G1, while their T ports are both connected to the oil tank.

[0114] In the upper slider control module CF3: the upper chamber oil port of the main cylinder 8 is connected to the outlet of cartridge valve C305 and the inlet of cartridge valve C308, and the inlet of cartridge valve C305 is connected to the outlet of cartridge valve C304.

[0115] The lower chamber oil port of the return cylinder is connected to the outlet of cartridge valve C307, the inlet of cartridge valve C307 is connected to the outlet of cartridge valve C306, the inlets of cartridge valve C304 and cartridge valve C306 are respectively connected to pressure oil circuit G1; the outlet of cartridge valve C306 is also connected to the inlets of cartridge valve C301 and cartridge valve C302, and the outlets of cartridge valve C301, cartridge valve C302 and cartridge valve C308 are all connected to the oil tank.

[0116] The hydraulic control port of cartridge valve C301 is connected to the P port of solenoid valve Y301, and the P port of solenoid valve Y301 is also connected to the A port of solenoid valve Y301 through relief valve F301.

[0117] The hydraulic control port of cartridge valve C302 is connected to port A of solenoid valve Y302, and port P of solenoid valve Y302 is connected to the inlet of cartridge valve C302.

[0118] The hydraulic control port of cartridge valve C307 is connected to port A of solenoid ball valve Y303, and port P of solenoid ball valve Y303 is connected to the outlet of cartridge valve C307.

[0119] The hydraulic control port of cartridge valve C306 is connected to the middle outlet of shuttle valve S1, the left inlet of shuttle valve S1 is connected to the outlet of cartridge valve C306, and the right inlet of shuttle valve S1 is connected to port A of solenoid valve Y304.

[0120] The hydraulic control port of cartridge valve C304 is connected to port A of solenoid valve Y305, the hydraulic control port of cartridge valve C308 is connected to port A of solenoid ball valve Y306, and port P of solenoid ball valve Y306 is connected to the outlet of cartridge valve C308; ports P of solenoid valves Y304 and Y305 are both connected to pressure oil circuit G1, and solenoid valves Y301, Y302, Y304, and Y305 are all two-position four-way valves and their ports T are all connected to the oil tank.

[0121] In the demolding slider control module CF5, the lower chamber of each demolding cylinder is connected to the outlet of cartridge valve C501 and the inlet of cartridge valve C503, the upper chamber of each demolding cylinder is connected to the outlet of cartridge valve C502 and the inlet of cartridge valve C504, the inlets of cartridge valve C501 and C502 are connected to pressure oil circuit G1, and the outlets of cartridge valve C503 and C504 are connected to the oil tank.

[0122] The hydraulic control port of cartridge valve C501 is connected to port A of solenoid valve Y501. The hydraulic control port of cartridge valve C502 is connected to the middle port of shuttle valve S6. The left inlet of shuttle valve S6 is connected to the outlet of cartridge valve C502. The right inlet of shuttle valve S6 is connected to port A of solenoid valve Y502.

[0123] The hydraulic control port of cartridge valve C503 is connected to port A of solenoid valve Y503 and connected to the oil tank through relief valve F503; the hydraulic control port of cartridge valve C504 is connected to port B of solenoid valve Y502 and connected to the oil tank through relief valve F501; the inlet of cartridge valve C504 is connected to the oil tank through relief valve F502; the P ports of solenoid valves Y501 and Y502 are both connected to pressure oil circuit G1; the T ports of solenoid valves Y501, Y502 and Y503 are all connected to the oil tank.

[0124] In the pusher control module CF4: the rodless chamber of the pusher cylinder 21b is connected to the outlet of cartridge valve C401 and the inlet of cartridge valve C403. The inlets of cartridge valve C401 and cartridge valve C402 are connected to the pressure oil circuit G1. The outlet of cartridge valve C402 is connected to the rod chamber of the pusher cylinder 21b and the inlet of cartridge valve C404.

[0125] The hydraulic control port of cartridge valve C401 is connected to the middle port of shuttle valve S4, the left inlet of shuttle valve S4 is connected to the outlet of cartridge valve C401, and the right inlet of shuttle valve S4 is connected to port A of solenoid valve Y401.

[0126] The hydraulic control port of cartridge valve C402 is connected to the middle port of shuttle valve S5, the left inlet of shuttle valve S5 is connected to the outlet of cartridge valve C402, and the right inlet of shuttle valve S5 is connected to port A of solenoid valve Y402.

[0127] The hydraulic control port of cartridge valve C404 is connected to the inlet of pressure regulating valves F402 and F403. The outlet of pressure regulating valve F402 is connected to port B of solenoid valve Y402. The outlet of pressure regulating valve F403 is connected to the outlet of cartridge valve C404. Solenoid valves Y401 and Y402 are both two-position four-way valves, and their P ports are both connected to pressure oil circuit G1, while their T ports are both connected to the oil tank.

[0128] The auxiliary energy storage module CF6 includes a pressurization pump P7, a medium-pressure small accumulator AC2, and a low-pressure small accumulator AC3. The medium-pressure small accumulator AC2 has a volume of 10L, a nitrogen charging pressure of 8MPa, a minimum operating pressure of 14MPa, and a maximum operating pressure of 15MPa. Two low-pressure small accumulators AC3 each have a volume of 25L, a nitrogen charging pressure of 3MPa, a minimum operating pressure of 4MPa, and a maximum operating pressure of 8MPa.

[0129] The outlet oil circuit of the pressurizing pump P7 is connected to the inlet of cartridge valve C602 and cartridge valve C603 respectively. The outlet of cartridge valve C602 is connected to the oil port of medium-pressure small accumulator AC2 through a check valve. The oil port of medium-pressure small accumulator AC2 is connected to the control port of proportional flow valve YAA through a check valve and independent control oil circuit 1.

[0130] The outlet of cartridge valve C603 is connected to the oil port of low-pressure small accumulator AC3 and the P port of solenoid valve Y607 via a check valve. The B port of solenoid valve Y607 is connected to the hydraulic control port of each filling valve 7. The hydraulic control port of cartridge valve C602 is connected to the A port of solenoid valve Y602, and the P port of solenoid valve Y602 is connected to the inlet of cartridge valve C602. The hydraulic control port of cartridge valve C603 is connected to the A port of solenoid valve Y603, and the P port of solenoid valve Y603 is connected to the inlet of cartridge valve C603. Solenoid valves Y602, Y603, and Y607 are all two-position four-way valves, and their T ports are all connected to the oil tank.

[0131] The working steps of this powder forming hydraulic press for powder hydraulic forming are as follows:

[0132] 1. The feeding cylinder moves forward, and the hopper moves forward to feed material: Motor M3 starts, driving the double low-pressure pumps P5 and P6 to run at a speed of 1650 rpm; Solenoid valve Y105 is energized, cartridge valve C109 is closed, and one-way cartridge valve C110 is opened, and double low-pressure pump P5 supplies oil to pressure oil circuit G1; Solenoid unloading valve Y108 is energized, and its B port is connected to its P port, so that pressure oil circuit G1 is pressurized.

[0133] When solenoid valve Y201 is energized, cartridge valve C201 opens due to pressure loss at the hydraulic control port, and pressurized oil enters the rodless chamber of the feeding cylinder at a flow rate of 114 L / min. Relief valve F201 controls the ejection pressure of the feeding cylinder at 0-16 MPa. The piston rod of the feeding cylinder extends to achieve feeding. The rod chamber of the feeding cylinder returns oil through cartridge valve C204, and relief valve F202 controls the ejection back pressure of the feeding cylinder at 0-5 MPa. When the feeding cylinder drives the hopper to move forward at a speed of 300 mm / s and reaches above the lower die, the feeding working position proximity switch SQ7 sends a signal, solenoid valve Y201 is de-energized, and the powder material falls into the lower die. The powder material at the bottom falls directly onto the worktable.

[0134] II. Feeding Cylinder Retraction: When the proximity switch SQ7 of the feeding working position sends a signal, the speed of motor M3 drops to 840 rpm; solenoid valve Y105 and solenoid unloading valve Y108 remain energized, solenoid valve Y201 is de-energized, and cartridge valve C201 is closed due to pressure build-up at the hydraulic control port; solenoid valve Y202 is energized, its P port is connected to its B port, and its A port is connected to its T port, and cartridge valve C202 opens due to pressure loss at the hydraulic control port, and pressurized oil enters the rod chamber of the feeding cylinder at a flow rate of 58 L / min, and the relief valve F203 controls the retraction pressure of the feeding cylinder at 0-8 MPa; the rodless chamber of the feeding cylinder returns oil through cartridge valve C203, and the relief valve F204 controls the retraction back pressure of the feeding cylinder at 0-5 MPa. When the piston rod of the feeding cylinder pulls the hopper back to its initial position at a speed of 300 mm / s, the feeding limit proximity switch SQ6 sends a signal, and the solenoid valve Y202 is de-energized.

[0135] 3. The upper slider quickly descends to the shift point: the speed of motor M3 increases to 2000 rpm; motor M1 starts, driving the dual low-pressure pump P1 and dual high-pressure pump P2 to operate at 2000 rpm; motor M2 starts, driving the dual low-pressure pumps P3 and P4 to operate at 2000 rpm. Dual low-pressure pump P1 + dual high-pressure pump P2, dual low-pressure pump P3 + dual high-pressure pump P4, and dual low-pressure pump P5 + dual high-pressure pump P6 supply oil simultaneously.

[0136] When solenoid valve Y101 is energized, cartridge valve C101 closes, one-way cartridge valve C102 opens, and dual low-pressure pump P1 supplies oil to pressure oil circuit two.

[0137] When solenoid valve Y102 is energized, cartridge valve C104 closes, one-way cartridge valve C103 opens, and dual high-pressure pump P2 supplies oil to pressure oil circuit two.

[0138] When solenoid valve Y103 is energized, cartridge valve C105 closes, one-way cartridge valve C106 opens, and dual low-pressure pump P3 supplies oil to pressure oil circuit 1.

[0139] When solenoid valve Y104 is energized, cartridge valve C108 closes, one-way cartridge valve C107 opens, and dual high-pressure pump P4 supplies oil to pressure oil circuit 1.

[0140] When solenoid valve Y105 is energized, cartridge valve C109 closes, one-way cartridge valve C110 opens, and dual low-pressure pump P5 supplies oil to pressure oil circuit 1.

[0141] When solenoid valve Y106 is energized, cartridge valve C112 closes, check cartridge valve C111 opens, and double high-pressure pump P6 supplies oil to pressure oil circuit 1.

[0142] When the electromagnetic unloading valve Y107 is energized, the pressure oil circuit two at the outlets of the dual low-pressure pump P1 and the dual high-pressure pump P2 is pressurized; the electromagnetic unloading valve Y108 remains energized, so that the pressure oil circuit one is pressurized; when the electromagnetic valve Y109 is energized, the cartridge valve C118 is opened, and the pressure oil circuit two and the pressure oil circuit one supply oil to the outside together.

[0143] Solenoid valve Y304 is de-energized, cartridge valve C306 is closed due to pressure build-up at the hydraulic control port, and pressure circuit 1 maintains pressure build-up;

[0144] When solenoid valve Y305 is energized, port P connects to port B, and port A connects to port T. Cartridge valve C304 opens due to loss of pressure at the hydraulic control port. Pressurized oil pushes open cartridge valve C305 and enters the upper chamber of the main cylinder, pushing the main slide block to descend rapidly at 200mm / s, improving production efficiency. The displacement sensor of the upper slide block 9 sends a signal to the speed change point for switching.

[0145] When solenoid valve Y607 is energized, port P is connected to port B, and port A is connected to port T. The filling valve 7 is opened due to the pressure build-up at the hydraulic control port, and the filling tank replenishes oil to the upper chamber of the master cylinder through the filling valve 7.

[0146] When solenoid valve Y302 is energized, port P is connected to port B, and port A is connected to port T. Cartridge valve C302 opens due to loss of pressure at the hydraulic control port.

[0147] When the solenoid ball valve Y303 is energized, port A and port T are connected. The cartridge valve C307 opens due to the loss of pressure at the hydraulic control port, causing the return cylinder to return oil to the oil tank.

[0148] When solenoid valve Y301 is energized, port P is connected to port B, and port A is connected to port T. The hydraulic control port of cartridge valve C301 is controlled by the pressure of 8MPa set by relief valve F301, which is used to preset the back pressure of return cylinder so that the back pressure can be quickly applied when the slider changes speed to the speed change point.

[0149] IV. Slowly descending the upper slide: Motors M1, M2, and M3 maintain a speed of 2000 rpm, and solenoid valves Y101, Y102, Y103, Y104, Y105, Y106, Y107, Y108, Y109, Y301, Y303, and Y305 remain energized.

[0150] Because the dual pumps pressurize simultaneously, the power consumption of the servo motor is reduced, and the pressure in the upper chamber of the main cylinder is controlled at <15MPa.

[0151] When solenoid valve Y302 is de-energized, port P is connected to port A, and port B is connected to port T. Cartridge valve C302 closes due to pressure build-up at the hydraulic control port.

[0152] When solenoid valve Y607 is de-energized, port P is connected to port A and port B is connected to port T. The filling valve 7 is closed due to the loss of pressure at the hydraulic control port. The upper slider 9 descends slowly at a speed of 20mm / s until the upper mold approaches the lower mold and contacts the powder material.

[0153] V. Rapid pressurization of the upper slider (with large accumulator involved): Motors M1, M2, and M3 maintain a speed of 2000 rpm, and solenoid valves Y101, Y102, Y103, Y104, Y105, Y106, Y107, Y108, Y109, Y301, Y303, and Y305 remain energized.

[0154] When solenoid valve Y112 is energized, ports P and B are connected, and ports A and T are connected. Cartridge valve C116 opens due to pressure loss at the hydraulic control port. The four 100L accumulators are connected to port A of proportional flow valve YAA. The pressurized oil stored in the four 100L accumulators enters the upper chamber of the main cylinder through the rapid pressurization oil circuit G3 for auxiliary rapid pressurization, which can greatly improve the pressurization efficiency.

[0155] The B port of the proportional flow valve YAA supplies oil to the upper chamber of the master cylinder through the one-way cartridge valve C117 and the rapid pressurization oil circuit G3. The valve core of the proportional flow valve YAA gradually opens, keeping the pressure in the upper chamber of the master cylinder <15MPa. The proportional flow valve YAA can automatically control the pressurization rate of the upper chamber of the master cylinder, avoiding the impact caused by the instantaneous release of pressure in the four 100L large accumulators. The one-way cartridge valve C117 is equipped with an adjustment handle to adjust the opening degree.

[0156] Because the powder material requires a relatively large pressing stroke to transform from a loose state to a preliminary formed state, three servo motors drive a dual pump and four large accumulators to jointly drive the upper slide block at a rapid pressurization speed of 50mm / s, shortening the initial forming time of the workpiece. When the upper chamber of the main cylinder reaches the set pressure, the pressure sensor VP301 sends a signal, switching to the working feed pressurization.

[0157] VI. Upper slide working pressurization: When motors M1, M2, and M3 maintain a speed of 2000 rpm and the main cylinder pressure is <15 MPa: Solenoid valves Y101, Y102, Y103, Y104, Y105, Y106, Y107, Y108, Y109, Y301, Y303, and Y305 remain energized.

[0158] When the main cylinder pressure is ≥15MPa: Solenoid valves Y102, Y104, Y106, Y107, Y108, Y109, Y301, Y303, and Y305 remain energized; when solenoid valve Y101 is de-energized, cartridge valve C101 opens, and the outlet of the dual low-pressure pump P1 returns to the oil tank; when solenoid valve Y103 is de-energized, cartridge valve C105 opens, and the outlet of the dual low-pressure pump P3 returns to the oil tank; when solenoid valve Y105 is de-energized, cartridge valve C109 opens, and the outlet of the dual low-pressure pump P5 returns to the oil tank; switch to single-pump oil supply from dual high-pressure pumps P2, P4, and P6.

[0159] The upper slider advances at a speed of 10 mm / s to pressurize the powder metallurgy workpiece from initial forming to complete pressing. When the upper chamber of the main cylinder reaches the set pressure, the pressure sensor VP301 sends a signal to switch to pressure holding.

[0160] 7. Upper slider pressure holding: All solenoid valves are closed and all motors stop running. Hold the pressure for a few seconds as needed to further shape the work.

[0161] 8. Demolding slide upward demolding: Motors M2 and M3 start and maintain a speed of 2000 rpm; solenoid valves Y103, Y104, Y105, Y106 and solenoid unloading valve Y108 are energized; dual low-pressure pump P3 and dual high-pressure pump P4 supply oil simultaneously, and dual low-pressure pump P5 and dual high-pressure pump P6 supply oil simultaneously.

[0162] When solenoid valve Y501 is energized, ports P and B are connected, and ports A and T are connected. Cartridge valve C501 opens due to pressure loss at the hydraulic control port. Pressure oil enters the lower chambers of each demolding cylinder at a rate of 184 L / min, bringing the total flow rate of the four demolding cylinders to 736 L / min. The ejector rods of the demolding cylinders push upwards at a speed of 200 mm / s, driving the demolding slide block upwards a certain distance, causing the lower mold to detach from the workpiece. During this process, the main cylinder remains stationary, and the upper slide block continues to press the workpiece onto the worktable. After demolding is complete, the demolding completion proximity switch SQ4 signals, solenoid valve Y501 is de-energized, and the demolding cylinders stop ejecting, awaiting pressure relief from the upper slide block.

[0163] Overflow valve F503 controls the lower chamber pressure of each demolding cylinder at 0-25MPa, and overflow valve F502 controls the upper chamber pressure of each demolding cylinder at 0-8MPa.

[0164] 9. Upper Slide Decompression: When solenoid ball valve Y306 is energized, ports A and T are connected. Cartridge valve C308 opens due to pressure loss at the hydraulic control port, decompressing the upper chamber of the main cylinder. Cartridge valve C308 is equipped with a control handle to adjust the decompression flow rate. Simultaneously with decompression of the upper chamber of the main cylinder, all other solenoid valves are de-energized, and all motors stop.

[0165] When the pressure in the upper chamber of the master cylinder is detected to be zero, the pressure sensor VP301 sends a signal, and the upper slider returns to its original position.

[0166] 10. Upper slide return: Motors M1, M2, and M3 maintain a speed of 2000 rpm; solenoid valves Y101, Y102, Y103, Y104, Y105, Y106, Y107, Y108, and Y109 are energized, and the dual low-pressure pump P1 and dual high-pressure pump P2 supply oil simultaneously, the dual low-pressure pump P3 and dual high-pressure pump P4 supply oil simultaneously, and the dual low-pressure pump P5 and dual high-pressure pump P6 supply oil simultaneously.

[0167] When solenoid valve Y304 is energized, port P is connected to port B, and port A is connected to port T. Cartridge valve C306 opens due to loss of pressure at the hydraulic control port. Pressurized oil pushes open cartridge valve C307 and enters the lower chamber of the two return cylinders. The plunger of the return cylinder pushes the upper slider to return rapidly upward at 300mm / s.

[0168] When the solenoid ball valve Y303 remains de-energized, and the oil supply circuit of the return cylinder loses pressure, the cartridge valve C307 can be closed in time to cut off the lower chamber oil circuit of the return cylinder and prevent the upper slide block from falling.

[0169] When solenoid valve Y607 is energized, port P is connected to port B, and port A is connected to port T. The filling valve 7 is opened due to the pressure build-up at the hydraulic control port, and oil returns from the upper chamber of the main cylinder to the filling tank through the filling valve 7.

[0170] 11. Demolding slide return stroke: Motor M1 stops running, motors M2 and M3 maintain a speed of 2000 rpm; solenoid valves Y103, Y104, Y105, Y106, and solenoid unloading valve Y108 are energized, and the dual low-pressure pump P3 and dual high-pressure pump P4 supply oil simultaneously, as do the dual low-pressure pump P5 and dual high-pressure pump P6.

[0171] When solenoid valve Y501 is energized, port P connects to port B, and port A connects to port T. Cartridge valve C501 opens due to pressure loss at the hydraulic control port, allowing pressurized oil to enter the lower chambers of the four demolding cylinders. The upper chambers of the demolding cylinders are maintained at a back pressure of 0-8 MPa by the overflow valve F501. The demolding cylinder pushes the demolding slider to continue its upward return at 200 mm / s until space for material ejection is provided. When the demolding cylinder reaches the set position, proximity switch SQ3 signals a stop.

[0172] 12. The lower pusher cylinder drives the push plate forward: Motors M1 and M2 stop running, while motor M3 maintains a speed of 2000 rpm; solenoid valves Y105, Y106, and Y108 are energized, and the dual low-pressure pump P5 and dual high-pressure pump P6 supply oil simultaneously.

[0173] When solenoid valve Y401 is energized, cartridge valve C401 opens due to pressure loss at the hydraulic control port. Pressurized oil enters the rodless chamber of pusher cylinder 21b at a flow rate of 399 L / min. Relief valve F401 controls the ejection pressure of pusher cylinder 21b at 0-25 MPa. The piston rod of the pusher cylinder extends at a speed of 500 mm / s, and the pusher plate pushes all the workpiece and scattered powder away from the worktable. Simultaneously, the pusher position proximity switch SQ10 signals to ensure the worktable remains clean before the next processing operation. Oil returns from the rod chamber of the pusher cylinder through cartridge valve C404, and relief valve F402 controls the ejection back pressure of the pusher cylinder at 0-5 MPa.

[0174] Thirteen, the lower pusher cylinder drives the push plate to retract: the speed of motor M3 drops to 1000rpm, solenoid valves Y105, Y106 and Y108 are energized, and the dual low-pressure pump P5 and dual high-pressure pump P6 supply oil simultaneously.

[0175] When solenoid valve Y402 is energized, its P port connects to port B, and its A port connects to port T. Cartridge valve C402 opens due to pressure loss at the hydraulic control port, allowing pressurized oil to enter the rod chamber of the pusher cylinder at a flow rate of 188 L / min. Relief valve F403 controls the retraction pressure of the pusher cylinder at 0-8 MPa. Oil returns from the rodless chamber of the pusher cylinder through cartridge valve C403, and relief valve F404 controls the retraction back pressure of the pusher cylinder at 0-5 MPa. After the piston rod of the pusher cylinder retracts to its position at a speed of 500 mm / s, the pusher cylinder's post-pull limit proximity switch SQ9 sends a signal.

[0176] 14. Demolding slide descends: Motor M3 speed increases to 2000rpm, solenoid valves Y105, Y106, and Y108 remain energized, and dual low-pressure pump P5 and dual high-pressure pump P6 supply oil simultaneously.

[0177] When solenoid valve Y502 is energized, its P port is connected to its B port and its A port is connected to its T port. Cartridge valve C502 opens due to the loss of pressure at the hydraulic control port, and pressurized oil enters the rod chamber of each demolding cylinder at a flow rate of 90L / min. The total flow rate of the four demolding cylinders is 360L / min.

[0178] When solenoid valve Y503 is energized, its P port is connected to its B port and its A port is connected to its T port. Cartridge valve C503 opens due to the loss of pressure at the hydraulic control port, and oil returns from the lower chamber of each demolding cylinder to the oil tank.

[0179] All demolding cylinders work together to pull the demolding slider back onto the worktable at a speed of 200mm / s. The demolding return proximity switch SQ5 sends a signal, waiting for the next feeding cycle.

[0180] Large accumulator charging: Motor M1 speed 2000rpm; Solenoid valves Y101 and Y102 are energized, and the dual low-pressure pump P1 and dual high-pressure pump P2 supply oil simultaneously;

[0181] When solenoid valve Y110 is energized, cartridge valve C113 opens due to pressure loss at the hydraulic control port. Pressurized oil pushes cartridge valve C114 open and enters the four 100L accumulators. The 100L accumulators are pressurized by the intervals of the following actions: the feeding cylinder moves forward, the feeding cylinder moves back, the demolding slide moves upward to demold, the upper slide releases pressure, the demolding slide moves upward to return, the lower push cylinder pushes out, the lower push cylinder moves back, and the demolding slide falls back. The pressurization pressure is ≤15MPa.

[0182] Large accumulator pressure relief: When solenoid valve Y111 is energized, cartridge valve C115 opens due to loss of pressure at the hydraulic control port, releasing the pressure oil in the four 100L large accumulators back to the oil tank. It can also be depressurized to the oil tank through manual ball valve V1.

[0183] Medium-pressure small accumulator charging: Motor M4 starts at 1140 rpm. Motor M4 is a 7.5KW ordinary motor; Solenoid valve Y601 is energized, cartridge valve C601 closes due to pressure build-up at the hydraulic control port, and pressure build-up occurs at the outlet of charging pump P7.

[0184] When solenoid valve Y602 is energized, cartridge valve C602 opens due to pressure loss at the hydraulic control port. Pressurized oil, after being filtered, enters the inlet of cartridge valve C602 and then pressurizes the 10L medium-pressure accumulator through a check valve at a pressure of 14MPa.

[0185] Low-pressure accumulator charging: Motor M4 starts at 1140 rpm, solenoid valve Y601 remains energized, and pressure is built up at the outlet of charging pump P7; solenoid valve Y603 is energized, cartridge valve C603 opens due to loss of pressure at the hydraulic control port, and the pressure oil at the outlet of charging pump P7 enters the two 25L low-pressure accumulators for charging, with a charging pressure of 5MPa.

[0186] Medium-pressure small accumulator pressure release: When solenoid valve Y604 is energized, the 14MPa pressure oil in the 10L medium-pressure small accumulator is supplied separately to the control port of proportional flow valve YAA, ensuring the reliable operation of proportional flow valve YAA and avoiding the need to add a separate oil pump.

[0187] Low-pressure accumulator depressurization: When solenoid valve Y605 is energized, 5MPa pressurized oil from the two 25L low-pressure accumulators enters the P port of solenoid valves Y606 and Y607. Solenoid valve Y607 controls the opening and closing of filling valve 7. This method can meet the large instantaneous flow required for reliable pressure building at the hydraulic control ports of the four filling valves in two workstations simultaneously, while avoiding the need for an additional independent oil pump.

[0188] Locking cylinder advance: There are two locking cylinders 22 symmetrically arranged facing each other. When the solenoid valve YV2 is energized, port P is connected to port B, and port A is connected to port T. The pressure oil in the two 25L low-pressure accumulators enters the lower chamber of the locking cylinder 22. The locking cylinder 22 returns oil through port A, and the hydraulic safety bolt enters the locking state. The locking limit switches SQ13 and SQ15 send signals.

[0189] Locking cylinder retraction: Solenoid valve YV1 is energized, P port is connected to A port, and B port is connected to T port. Pressure oil from the two 25L low-pressure accumulators enters the upper chamber of the locking cylinder. The locking cylinder returns oil through B port, the hydraulic safety bolt is unlocked, and the unlocking limit switches SQ12 and SQ14 send signals.

[0190] The above description is merely a preferred embodiment of the present invention, showing and describing the basic principles, main features, and advantages of the present invention. It is not intended to limit the scope of patent protection of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. In addition to the above embodiments, the present invention may have other implementations without departing from the spirit and scope of the invention. Various changes and modifications to the present invention are possible, and all technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents. Technical features not described in the present invention can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A powder forming hydraulic press, comprising a machine body, a main cylinder, an upper slide block, and a worktable, characterized in that: The bottom of the upper slider is fixed with an upper mold for pressing powder. Symmetrical return supports are provided on the left and right sides of the upper slider, each driven by a return cylinder. A demolding slider is stacked above the worktable. Demolding cylinders are installed below the four corners of the worktable, with the ejector rods of each cylinder connected to the corners of the demolding slider. A mold mounting hole is provided in the center of the demolding slider, and a through lower mold is installed in the mold mounting hole. Demolding slider guide rails that mate with the machine body guide rails are provided at the four outer corners of the demolding slider. A feeding mechanism driven by a feeding cylinder is provided on the rear side of the demolding slider, and a pushing mechanism driven by a pushing cylinder is provided below the feeding mechanism. The feeding support plate of the feeding mechanism is spliced ​​to the rear side of the demolding slider, and their top surfaces are flush. The upper chamber oil port of the main cylinder is connected to the outlet of cartridge valve C305 and the inlet of cartridge valve C308, and the inlet of cartridge valve C305 is connected to the outlet of cartridge valve C304; the lower chamber oil port of the return cylinder is connected to the outlet of cartridge valve C307, and the inlet of cartridge valve C307 is connected to the outlet of cartridge valve C306; the inlets of cartridge valve C304 and cartridge valve C306 are respectively connected to pressure oil circuit one; the outlet of cartridge valve C306 is also connected to the inlets of cartridge valve C301 and cartridge valve C302, and the outlets of cartridge valve C301, cartridge valve C302 and cartridge valve C308 are all connected to the oil tank; The first pressure oil circuit is supplied with oil by two tandem pumps, and the second pressure oil circuit is supplied with oil by one tandem pump. One end of the second pressure oil circuit is connected to the first pressure oil circuit through a cartridge valve C118. The other end of the pressure oil circuit 2 is connected to the inlet of cartridge valve C113, the outlet of cartridge valve C113 is connected to the inlet of cartridge valve C114, the outlet of cartridge valve C114 is connected to the oil pipe inlet of the large accumulator and the inlet of cartridge valve C115, and the outlet of cartridge valve C115 is connected to the oil tank. The oil pipe outlet of the large accumulator is connected to port A of the proportional flow valve YAA via cartridge valve C116. Port B of the proportional flow valve YAA is connected to the rapid pressurization oil circuit via cartridge valve C117. The outlet of the rapid pressurization oil circuit is connected to the upper chamber oil port of the master cylinder.

2. The powder forming hydraulic press according to claim 1, characterized in that: The rodless chamber of the feeding cylinder is connected to the outlet of cartridge valve C201 and the inlet of cartridge valve C203. The inlets of cartridge valve C201 and cartridge valve C202 are connected to the first pressure oil circuit. The outlet of cartridge valve C202 is connected to the rod chamber of the feeding cylinder and the inlet of cartridge valve C204. The hydraulic control port of cartridge valve C201 is connected to the middle port of shuttle valve S2. The left inlet of shuttle valve S2 is connected to the outlet of cartridge valve C201, and the right inlet of shuttle valve S2 is connected to port A of solenoid valve Y201. The hydraulic control port of cartridge valve C202 is connected to the middle port of shuttle valve S3. The left inlet of shuttle valve S3 is connected to the outlet of cartridge valve C202, and the right inlet of shuttle valve S3 is connected to port A of solenoid valve Y202. The hydraulic control port of cartridge valve C204 is connected to the inlets of pressure regulating valves F202 and F203. The outlet of pressure regulating valve F202 is connected to port B of solenoid valve Y202, and the outlet of pressure regulating valve F203 is connected to the outlet of cartridge valve C204. Solenoid valves Y201 and Y202 are both two-position four-way valves, and their P ports are both connected to pressure oil circuit 1, while their T ports are both connected to the oil tank.

3. The powder forming hydraulic press according to claim 1, characterized in that: The lower chamber of each demolding cylinder is connected to the outlet of cartridge valve C501 and the inlet of cartridge valve C503. The upper chamber of each demolding cylinder is connected to the outlet of cartridge valve C502 and the inlet of cartridge valve C504. The inlets of cartridge valve C501 and cartridge valve C502 are connected to pressure oil circuit 1. The outlets of cartridge valve C503 and cartridge valve C504 are connected to oil tank.

4. The powder forming hydraulic press according to claim 1, characterized in that: The rodless chamber of the pusher cylinder is connected to the outlet of cartridge valve C401 and the inlet of cartridge valve C403. The inlets of cartridge valve C401 and cartridge valve C402 are connected to the first pressure oil circuit. The outlet of cartridge valve C402 is connected to the rod chamber of the pusher cylinder and the inlet of cartridge valve C404. The hydraulic control port of cartridge valve C401 is connected to the middle port of shuttle valve S4. The left inlet of shuttle valve S4 is connected to the outlet of cartridge valve C401, and the right inlet of shuttle valve S4 is connected to port A of solenoid valve Y401. The hydraulic control port of cartridge valve C402 is connected to the middle port of shuttle valve S5. The left inlet of shuttle valve S5 is connected to the outlet of cartridge valve C402, and the right inlet of shuttle valve S5 is connected to port A of solenoid valve Y402. The hydraulic control port of cartridge valve C404 is connected to the inlets of pressure regulating valves F402 and F403. The outlet of pressure regulating valve F402 is connected to port B of solenoid valve Y402, and the outlet of pressure regulating valve F403 is connected to the outlet of cartridge valve C404. Solenoid valves Y401 and Y402 are both two-position four-way valves, with their P ports connected to pressure oil circuit 1 and their T ports connected to the oil tank.

5. The powder forming hydraulic press according to claim 1, characterized in that: The first pressure oil circuit is also connected to port B of the electromagnetic unloading valve Y108, and the second pressure oil circuit is also connected to port B of the electromagnetic unloading valve Y107; the hydraulic control port of the cartridge valve C118 is connected to port A of the electromagnetic valve Y109, the P port of the electromagnetic valve Y109 is connected to the middle port of the shuttle valve S7, and the left and right ends of the shuttle valve S7 are respectively connected to the first pressure oil circuit and the second pressure oil circuit; the hydraulic control port of the cartridge valve C113 is connected to port A of the electromagnetic valve Y110, and the P port of the electromagnetic valve Y110 is connected to the first pressure oil circuit; The hydraulic control port of cartridge valve C115 is connected to port B of solenoid ball valve Y111, and port P of solenoid ball valve Y111 is connected to the outlet of cartridge valve C115; the hydraulic control port of cartridge valve C116 is connected to port A of solenoid valve Y112, and port P of solenoid valve Y112 is connected to the oil pipe outlet of the large accumulator; the solenoid unloading valves Y107, Y108, Y109, Y110, Y111, and Y112 are all two-position four-way valves and their T ports are all connected to the oil tank.

6. The powder forming hydraulic press according to claim 5, characterized in that: An auxiliary energy storage module (CF6) is also provided. The auxiliary energy storage module (CF6) includes a charging pump P7, a medium-pressure small energy storage unit, and a low-pressure small energy storage unit. The outlet oil circuit of the charging pump P7 is connected to the inlet of cartridge valve C602 and cartridge valve C603, respectively. The outlet of cartridge valve C602 is connected to the oil port of the medium-pressure small energy storage unit through a check valve. The oil port of the medium-pressure small energy storage unit is connected to the control port of the proportional flow valve YAA through a check valve and an independent control oil circuit. The outlet of cartridge valve C603 is connected to the oil port of the low-pressure small accumulator and the P port of solenoid valve Y607 via a check valve. The B port of solenoid valve Y607 is connected to the hydraulic control port of each filling valve. The hydraulic control port of cartridge valve C602 is connected to the A port of solenoid valve Y602, and the P port of solenoid valve Y602 is connected to the inlet of cartridge valve C602. The hydraulic control port of cartridge valve C603 is connected to the A port of solenoid valve Y603, and the P port of solenoid valve Y603 is connected to the inlet of cartridge valve C603. Solenoid valves Y602, Y603, and Y607 are all two-position four-way valves, and their T ports are all connected to the oil tank.

7. The powder forming hydraulic press according to claim 1, characterized in that: The feeding mechanism also includes a hopper and feeding guide rods. The lower end of the hopper is located on the feeding support plate. A hopper connecting plate is fixed to the rear side wall of the hopper. The middle part of the hopper connecting plate is connected to the front end of the piston rod of the feeding cylinder. The feeding cylinder is fixed on the feeding cylinder support. The bottom of the feeding cylinder support is fixed on the feeding support plate. Feeding guide rods are symmetrically connected to both sides of the hopper connecting plate. The feeding guide rods pass through the feeding guide sleeves respectively. The feeding guide sleeves are fixed on the feeding cylinder support respectively. The feeding support plate is spliced ​​to the rear side of the demolding slider, and the top surfaces of the two are flush.

8. A powder hydraulic forming method, using the powder forming hydraulic press according to any one of claims 1 to 7, characterized in that, The steps are as follows: S1. The powder material is loaded into the hopper, and the feeding cylinder drives the hopper to move forward to above the demolding slider, so that the powder material falls into the lower mold. S2. The feeding cylinder pulls the hopper away from the demolding slider and retracts to the initial position; S3. Pressure oil enters the upper chamber of the main cylinder, pushing the main slider to descend rapidly to the shift point, and each filling valve opens to replenish oil to the upper chamber of the main cylinder. S4. The upper slider slowly descends until the upper mold contacts the powder material; S5. The upper slider is rapidly pressurized, and the large accumulator participates in supplying oil to the upper chamber of the main cylinder through the proportional flow valve, so as to initially press the powder material into shape. S6. The upper slider feeds and presses the powder workpiece to completely compress it into shape. S7. Upper slider maintains pressure; S8. Each demolding cylinder drives the demolding slider to move upward a certain distance, so that the lower mold separates from the workpiece. During the demolding process, the upper slider remains pressed and stationary. S9. The pressure in the upper chamber of the main cylinder drops to zero, causing the upper slider to release pressure. S10, the return cylinder pushes the upper slider upwards for a rapid return stroke, and the upper chamber of the main cylinder returns oil to the filling tank through the filling valve; S11. Each demolding cylinder continues to drive the demolding slider to return upward until the material ejection space is made available; S12, the pusher cylinder drives the pusher plate to push forward, pushing all the workpiece and scattered powder away from the worktable; S13, The pusher cylinder pulls the push plate backward to return to its original position; S14. All demolding cylinders work together to pull the demolding slider back onto the worktable, waiting for the next feeding cycle.

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