A die structure and extrusion method for an ultra-high pressure horizontal hydrostatic extrusion press

Abstract

This invention provides a die structure and extrusion method for an ultra-high pressure horizontal hydrostatic extrusion press; comprising: a die base (1), a die assembly (2), a billet seal (3), a billet (4), a high-pressure medium collection device (5), an extrusion cylinder (6), and an extrusion rod (7); the die base (1) is fixedly installed on the front beam of the extruder, and a step is provided at the right end of the die base (1) to cooperate with the die assembly (2); the left end of the extrusion cylinder (6) is provided with a hole to cooperate with the die assembly (2) and the die base (1), and an extrusion cylinder seal (604) is provided at its right end; the extrusion cylinder (6) and the extrusion rod (7) move left and right by a hydraulic cylinder. This invention also relates to an industrially producible hydrostatic extrusion method. The method overcomes the problem that the existing technology cannot meet the filling and discharging requirements of ultra-high pressure (>1600MPa) and cannot realize industrially producible automatic hydrostatic extrusion production.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical equipment technology; in particular, it relates to a die structure and extrusion method for an ultra-high pressure horizontal hydrostatic extrusion press. Background Technology

[0002] Hydrostatic extrusion is a type of extrusion process where liquid is pressurized in an extrusion cylinder via an extrusion rod. The liquid then transmits the pressure to the ingot, causing it to be formed through a die. Currently, the highest pressure of hydrostatic extrusion equipment in China generally does not exceed 800 MPa, and most are small-scale experimental devices. The filling method typically uses a medium pump and check valve, and is manually controlled. The draining method is usually a coarse, direct discharge. Feeding, filling / draining, extrusion, and sawing are all done manually. Detailed reports on medium-to-large-scale hydrostatic extrusion presses suitable for industrial production have not yet been found.

[0003] The medium pressure in ultra-high pressure horizontal hydrostatic extruders is extremely high, exceeding 1600 MPa, which ordinary one-way valves cannot withstand. Therefore, automatic loading and unloading methods and automatic filling and discharging methods for ultra-high pressure horizontal hydrostatic extruders are key to achieving industrial-scale production of ultra-high pressure hydrostatic extrusion. Summary of the Invention

[0004] The purpose of this invention is to provide a die structure and extrusion method for an ultra-high pressure horizontal hydrostatic extrusion press. This invention overcomes the problems of existing technologies being unable to meet the requirements of ultra-high pressure (>1600MPa) filling and discharging, and unable to achieve automated hydrostatic extrusion production for industrial production.

[0005] This invention is achieved through the following technical solution:

[0006] This invention relates to a die structure for an ultra-high pressure horizontal hydrostatic extrusion press, comprising: a die base 1, a die assembly 2, a billet sealing component 3, a billet 4, a high-pressure medium collection device 5, an extrusion cylinder 6, and an extrusion rod 7.

[0007] The die holder 1 is fixedly installed on the front beam of the extruder, and the right end of the die holder 1 is provided with a step that cooperates with the die assembly 2.

[0008] The left end of the extrusion cylinder 6 is provided with a hole that mates with the mold assembly 2 and the mold base 1, and the right end of the extrusion cylinder is provided with an extrusion cylinder seal 604;

[0009] The extrusion cylinder 6 and the extrusion rod 7 move left and right via a hydraulic cylinder.

[0010] Preferably, the right end of the step of the mold base 1 is provided with a chamfer.

[0011] Preferably, the left end of the blank 4 is connected to the right end of the mold assembly 2 with a large flared opening, and the thin shaft portion of the right end of the blank 4 is connected to the inner hole of the mold 201 base.

[0012] Preferably, a sealing groove for installing the billet seal 3 is provided at the left end of the billet 4. Before loading, the billet 4, the billet seal 3 and the mold assembly 2 are assembled. The billet seal 3 ensures a tight fit between the billet 4 and the mold assembly 2. On the one hand, it ensures the stability of the billet 4 in a horizontal state after installation. On the other hand, it ensures that the high-pressure medium does not flow out from between the billet 4 and the mold assembly 2 during filling.

[0013] Preferably, the mold assembly 2 includes: a mold 201, a flow-through copper sleeve 202, and a mold seal 203;

[0014] The mold 201 has an inner hole at its left end that mates with the mold base 1. During feeding, the mold assembly 2 and the assembled blank 4 are fed into the extrusion center together. Then, the mold assembly 2 is moved to the left until the left end face of the mold 201 is close to the right end face of the mold base 1. The mold assembly 2 and the blank 4 are fixed on the mold base 1 by the step at the right end of the mold base 1.

[0015] Preferably, one end of the flow-through copper sleeve 202 is provided with a petal-shaped flow-through groove 202-1, which serves as a flow channel for the high-pressure medium during filling and draining. During filling and draining, the other end of the flow-through copper sleeve 202 engages with the inner hole of the extrusion cylinder 6 to ensure that the mold assembly 2 and the blank 4 remain at the extrusion center.

[0016] Preferably, the left end of the extrusion cylinder 6 is provided with a hole that mates with the mold assembly 2 and the mold base 1; the extrusion cylinder 6 is moved left and right by a hydraulic cylinder and is provided with a feeding position, a top feeding position, a liquid filling position, a locking position (extrusion position), and a liquid discharge position.

[0017] The right end of the extrusion cylinder 6 is provided with an extrusion cylinder seal 604. During the movement of the extrusion rod 7 and the extrusion cylinder 6, the extrusion cylinder seal 604 never separates from the extrusion rod 7, thus ensuring the life of the extrusion cylinder seal 604.

[0018] The left end face of the extrusion cylinder 6 has holes at both the top and bottom. The upper hole is an air inlet / outlet hole 602, and the lower hole is a liquid inlet / outlet hole 603. A liquid drain trough 601 is provided at the lower left end of the extrusion cylinder 6. During liquid draining, the high-pressure medium flows into the high-pressure medium collection device 5 through the liquid inlet / outlet hole 603 and the liquid drain trough 601.

[0019] Preferably, the high-pressure medium collection device 5 is installed at the lower part of the extrusion cylinder 6. During discharge, the high-pressure medium flows into the high-pressure medium collection device 5 through the inlet / outlet hole 603 and the discharge trough 601.

[0020] This invention also relates to a hydrostatic extrusion method for the aforementioned ultra-high pressure horizontal hydrostatic extrusion press die structure, comprising the following steps: sequentially feeding, ejecting, filling with liquid, extruding, draining, sawing, and restoring to the initial state. This overcomes the problem that existing technologies cannot meet the requirements for ultra-high pressure (>1600MPa) filling and draining, and cannot achieve automated hydrostatic extrusion production suitable for industrial production.

[0021] Preferably, the steps are as follows:

[0022] Step 1, feeding: At this time, the extrusion cylinder 6 and extrusion rod 7 are located at the feeding position. The robot arm holds the mold assembly 2 and moves the assembled billet 4, billet sealing part 3 and mold assembly 2 to the extrusion center, and moves it to the left so that the left end face of the mold 201 is close to the right end face of the mold base 1.

[0023] Step 2, Unloading: Keep the robot holding the mold assembly 2 in place, the extrusion cylinder 5 moves to the left, the extrusion rod 7 moves to the left to contact the blank 4, and a certain clamping force is applied to ensure that the left end face of the mold 201 is close to the right end face of the mold base 1, further ensuring that the blank 4, the blank sealing part 3 and the mold assembly 2 will not fall off.

[0024] Step 3, Filling: The robotic arm moves away, and the extrusion cylinder 6 moves to the left to the filling position. The inner hole of the extrusion cylinder 6 connects with the petal-shaped part of the flow-through copper sleeve 202, ensuring that the mold assembly 2 and the blank 4 remain horizontal, and that the high-pressure medium can flow through the flow groove 202-1 of the flow-through copper sleeve 202. The extrusion rod 7 moves to the right to the position where it has not disengaged from the extrusion cylinder seal 604, leaving sufficient space for filling while ensuring that the extrusion rod 7 does not disengage from the extrusion cylinder seal 604. The inlet and outlet holes 603 and the inlet and outlet holes 602 of the extrusion cylinder are opened, and the high-pressure medium is flushed into the internal cavity of the extrusion cylinder 6 through the filling device. When liquid is discharged from the inlet and outlet holes 602, the filling is considered complete. To ensure the filling effect, multiple fillings can be performed.

[0025] Step 4, Extrusion: After filling with liquid, the extrusion rod 7 is moved to the left a certain distance. Excess high-pressure medium still flows out from the inlet and outlet holes 602 to further ensure the filling effect. At the same time, the extrusion rod 7 does not disengage from the extrusion cylinder seal 604 during the process of moving the extrusion cylinder 6 to the extrusion position. After the extrusion cylinder 6 moves to the extrusion position, extrusion begins. The billet 4 is extruded and shaped from the outlet of the mold 201 under the pressure of the high-pressure medium.

[0026] Step 5, Drainage: After the extrusion is completed and the extrusion rod 7 is depressurized, the extrusion cylinder 6 moves to the right to the drainage position. When the extrusion cylinder 6 is in the drainage position, the mold assembly 2 is located inside the left side of the extrusion cylinder 6 but is not completely separated from the extrusion cylinder 6. The high-pressure medium seal is released, and the high-pressure medium flows from the inlet / outlet hole 604 and the drainage groove 601 into the high-pressure medium collection device 5 for recycling. Because the high-pressure medium has high viscosity and poor fluidity, it takes a long time to flow out from the inlet / outlet hole 603. Therefore, the drainage groove 601 is opened at the left end of the extrusion cylinder 6.

[0027] Step 6, sawing and restoring to the initial state: After the liquid is drained, the extrusion cylinder 6 and extrusion rod 7 are moved to the rightmost initial state, and the mold assembly 2 is moved a certain distance to the right, separating it from the mold base 1. The extruded profile is sawed, the mold assembly 2 is removed, and after restoring to the initial state, it is ready for the next extrusion.

[0028] The present invention has the following advantages:

[0029] The present invention relates to a die structure and hydrostatic extrusion method for an ultra-high pressure horizontal hydrostatic extrusion press, which can meet the filling and discharging requirements of ultra-high pressure (>1600MPa) and realize automated hydrostatic extrusion production that can be industrialized. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the tooling structure of the ultra-high pressure horizontal hydrostatic extruder involved in this invention;

[0031] Figure 2 This is an enlarged view of the mold assembly structure;

[0032] Figure 3 This is the isometric drawing of the overcurrent copper sleeve;

[0033] Figure 4 This is a flowchart of the extrusion process;

[0034] Explanation of reference numerals in the attached drawings: 1. Mold base; 2. Mold assembly; 3. Billet seal; 4. Billet; 5. High-pressure medium collection device; 6. Extrusion cylinder; 7. Extrusion rod; 201. Mold; 202. Flow sleeve; 202-1. Flow groove; 203. Mold seal; 601. Drainage groove; 602. Inlet and outlet holes; 603. Inlet and outlet holes; 604. Extrusion cylinder seal. Detailed Implementation

[0035] The present invention will now be described in detail with reference to specific embodiments. It should be noted that the following embodiments are merely further illustrations of the present invention, but the scope of protection of the present invention is not limited to the following embodiments.

[0036] Example

[0037] This embodiment relates to a die structure for an ultra-high pressure horizontal hydrostatic extrusion press, see... Figure 1 As shown, it includes: mold base 1, mold assembly 2, billet sealing component 3, billet 4, high-pressure medium collection device 5, extrusion cylinder 6, and extrusion rod 7;

[0038] The die holder 1 is fixedly installed on the front beam of the extruder, and the right end of the die holder 1 is provided with a step that cooperates with the die assembly 2.

[0039] The left end of the extrusion cylinder 6 is provided with a hole that mates with the mold assembly 2 and the mold base 1, and the right end of the extrusion cylinder is provided with an extrusion cylinder seal 604;

[0040] The extrusion cylinder 6 and the extrusion rod 7 move left and right via a hydraulic cylinder.

[0041] Preferably, the right end of the step of the mold base 1 is provided with a chamfer.

[0042] Preferably, the left end of the blank 4 is connected to the right end of the mold assembly 2 with a large flared opening, and the thin shaft portion of the right end of the blank 4 is connected to the inner hole of the mold 201 base.

[0043] Preferably, a sealing groove for installing the billet seal 3 is provided at the left end of the billet 4. Before loading, the billet 4, the billet seal 3 and the mold assembly 2 are assembled. The billet seal 3 ensures a tight fit between the billet 4 and the mold assembly 2. On the one hand, it ensures the stability of the billet 4 in a horizontal state after installation. On the other hand, it ensures that the high-pressure medium does not flow out from between the billet 4 and the mold assembly 2 during filling.

[0044] Preferably, the mold assembly 2 includes: see Figure 2 As shown: mold 201, flow copper sleeve 202, mold seal 203;

[0045] The mold 201 has an inner hole at its left end that mates with the mold base 1. During feeding, the mold assembly 2 and the assembled blank 4 are fed into the extrusion center together. Then, the mold assembly 2 is moved to the left until the left end face of the mold 201 is close to the right end face of the mold base 1. The mold assembly 2 and the blank 4 are fixed on the mold base 1 by the step at the right end of the mold base 1.

[0046] Preferably, one end of the flow-through copper sleeve 202 has a petal-shaped flow-through groove 202-1, see Figure 3 As shown: the flow channel 202-1 is the flow channel when the high-pressure medium is filled and drained; during filling and draining, the other end of the flow copper sleeve 202 is engaged with the inner hole of the extrusion cylinder 6 to ensure that the mold assembly 2 and the blank 4 are kept in the extrusion center.

[0047] Preferably, the left end of the extrusion cylinder 6 is provided with a hole that mates with the mold assembly 2 and the mold base 1; the extrusion cylinder 6 is moved left and right by a hydraulic cylinder and is provided with a feeding position, a top feeding position, a liquid filling position, a locking position (extrusion position), and a liquid discharge position.

[0048] The right end of the extrusion cylinder 6 is provided with an extrusion cylinder seal 604. During the movement of the extrusion rod 7 and the extrusion cylinder 6, the extrusion cylinder seal 604 never separates from the extrusion rod 7, thus ensuring the life of the extrusion cylinder seal 604.

[0049] The left end of the extrusion cylinder 6 has openings at the top and bottom. The upper opening is an air inlet / outlet 602, and the lower opening is a liquid inlet / outlet 603. A liquid drain trough 601 is provided at the lower left end of the extrusion cylinder 6. During liquid draining, the high-pressure medium flows into the high-pressure medium collection device 5 through the liquid inlet / outlet 603 and the liquid drain trough 601.

[0050] Preferably, the high-pressure medium collection device 5 is installed at the lower part of the extrusion cylinder 6. During discharge, the high-pressure medium flows into the high-pressure medium collection device 5 through the inlet / outlet hole 603 and the discharge trough 601.

[0051] This invention also relates to a hydrostatic extrusion method for the aforementioned ultra-high pressure horizontal hydrostatic extrusion press die structure, see [link to relevant documentation]. Figure 4 As shown (following the attached diagram from top to bottom): This includes the following steps:

[0052] 1. Feeding: At this time, the extrusion cylinder 6 and extrusion rod 7 are located at the feeding position (rightmost end). The mechanical arm (not shown in the figure) clamps the mold assembly 2 and moves the assembled billet 4, billet sealing part 3 and mold assembly 2 to the extrusion center, and moves it to the left until the left end face of the mold 201 is close to the right end face of the mold base 1.

[0053] 2. Unloading: Keep the robot holding the mold assembly 2 in place, the extrusion cylinder 5 moves to the left, the extrusion rod 7 moves to the left to contact the blank 4, and a certain clamping force is applied to ensure that the left end face of the mold 201 is close to the right end face of the mold base 1, further ensuring that the blank 4, the blank sealing part 3 and the mold assembly 2 will not fall off.

[0054] 3. Filling: The robotic arm moves away, and the extrusion cylinder 6 moves to the left to the filling position. The inner hole of the extrusion cylinder 6 connects with the petal-shaped part of the flow-through copper sleeve 202, ensuring that the mold assembly 2 and the blank 4 remain horizontal, and that the high-pressure medium can flow through the flow groove 202-1 of the flow-through copper sleeve 202. The extrusion rod 7 moves to the right until it is still in the position of the extrusion cylinder seal 604, leaving sufficient space for filling while ensuring that the extrusion rod 7 does not detach from the extrusion cylinder seal 604. The inlet and outlet holes 603 and the inlet and outlet holes 602 of the extrusion cylinder are opened, and the high-pressure medium is flushed into the internal cavity of the extrusion cylinder 6 through the filling device. When liquid is discharged from the inlet and outlet holes 602, the filling is considered complete. To ensure the filling effect, multiple fillings can be performed.

[0055] 4. Extrusion: After filling with liquid, the extrusion rod 7 is moved to the left a certain distance, allowing the high-pressure medium to continue flowing out from the inlet and outlet ports 602, further ensuring the filling effect. Simultaneously, the extrusion rod 7 remains in place of the extrusion cylinder seal 604 during the movement of the extrusion cylinder 6 to the extrusion position. After the extrusion cylinder 6 moves to the extrusion position, extrusion begins, and the billet 4 is extruded and shaped from the outlet of the mold 201 under the pressure of the high-pressure medium.

[0056] 5. Drainage: After extrusion is completed and the extrusion rod 7 is depressurized, the extrusion cylinder 6 moves to the right to the drainage position. When the extrusion cylinder 6 is in the drainage position, the mold assembly 2 is located inside the left side of the extrusion cylinder 6 but is not completely separated from the extrusion cylinder 6. The high-pressure medium seal is released, and the high-pressure medium flows from the inlet and outlet holes 604 and the drainage groove 601 into the high-pressure medium collection device 5 for recycling. Because the high-pressure medium has high viscosity and poor fluidity, it takes a long time to flow out from the inlet and outlet holes 603. Therefore, the drainage groove 601 is opened at the left end of the extrusion cylinder 6.

[0057] 6. Sawing and restoring to initial state: After the liquid is drained, the extrusion cylinder 6 and extrusion rod 7 are moved to the rightmost initial state. The mold assembly 2 is moved a certain distance to the right and detached from the mold base 1. The extruded profile is sawn, the mold assembly 2 is removed, and after restoring to the initial state, it is ready for the next extrusion.

[0058] The method described in this invention overcomes the problem that existing technologies cannot meet the requirements for filling and discharging liquids under ultra-high pressure (>1600MPa) and cannot achieve automated hydrostatic extrusion production that can be industrialized.

[0059] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A working die structure of an ultrahigh pressure horizontal hydrostatic extrusion machine, characterized by comprising: It comprises: a die seat (1), a die assembly (2), a blank seal (3), a blank (4), a high-pressure medium collecting device (5), an extrusion cylinder (6), an extrusion rod (7); wherein the die seat (1) is fixedly installed on the front beam of the extruder, and the right end of the die seat (1) is provided with a step matched with the die assembly (2); the left end of the extrusion cylinder (6) is provided with a hole matched with the die assembly (2) and the die seat (1) respectively, and the right end is provided with an extrusion cylinder seal (604); the extrusion cylinder (6) and the extrusion rod (7) move left and right through a hydraulic cylinder; the die assembly (2) comprises: a die (201), a flow-through copper sleeve (202), and a die seal (203); the left end of the die (201) is provided with an inner hole matched with the die seat (1); one end of the flow-through copper sleeve (202) is provided with a petal-shaped flow-through groove (202-1); the flow-through groove (202-1) is a flow-through channel for high-pressure medium filling and draining; the left end of the extrusion cylinder (6) is provided with a hole matched with the die assembly (2) and the die seat (1); the extrusion cylinder (6) moves left and right through a hydraulic cylinder and is provided with a feeding position, a material lifting position, a liquid filling position, a locking position, and a liquid draining position; the right end of the extrusion cylinder (6) is provided with an extrusion cylinder seal (604); the left end of the extrusion cylinder (6) is provided with upper and lower holes; the upper hole is an air inlet and exhaust hole (602), and the lower hole is a liquid inlet and outlet hole (603); the lower part of the left end of the extrusion cylinder (6) is provided with a liquid draining groove (601).

2. The working die structure of an ultrahigh-pressure horizontal hydraulic extrusion press according to claim 1, wherein The right end of the step of the die seat (1) is provided with a chamfer.

3. The working die structure of an ultrahigh-pressure horizontal hydraulic extrusion press according to claim 1, wherein The left end of the blank (4) is connected with the right end of the die assembly (2) in a flared large opening end, and the left end of the blank (4) is connected with the die (201) base inner hole in a thin shaft part.

4. The working die structure of an ultrahigh-pressure horizontal hydraulic extrusion press according to claim 1, wherein The left end of the blank (4) is provided with a sealing groove for installing the blank seal (3).

5. The working die structure of an ultrahigh-pressure horizontal hydraulic extrusion press according to claim 1, wherein The high-pressure medium collecting device (5) is installed at the lower part of the extrusion cylinder (6); when draining, the high-pressure medium flows into the high-pressure medium collecting device (5) through the liquid inlet and outlet hole (603) and the liquid draining groove (601).

6. An extrusion method using the tool structure of the super-high pressure horizontal hydrostatic extrusion machine according to claim 1, characterized in that, It comprises the following steps in sequence: feeding, material lifting, liquid filling, extrusion, liquid draining, sawing and restoring the initial state.

7. The method of extrusion of a working die structure of an ultrahigh-pressure horizontal hydrostatic extrusion press according to claim 6, characterized in that, The steps are as follows: Step 1, feeding: the extrusion cylinder (6) and the extrusion rod (7) are located at the feeding position, the die assembly (2) is clamped by a mechanical hand, the assembled blank (4), blank seal (3) and die assembly (2) are moved to the extrusion center, and then left to the left end face of the die (201) and the right end face of the die seat (1) are tightly attached; Step 2, material lifting: keep the state of clamping the die assembly (2) by the mechanical hand, move the extrusion cylinder left, move the extrusion rod (7) left to contact the blank (4), apply a clamping force to make the left end face of the die (201) and the right end face of the die seat (1) tightly attached, and make the blank (4), blank seal (3) and die assembly (2) not fall off; Step 3, liquid filling: the mechanical hand moves away, the left extrusion cylinder (6) moves to the liquid filling position, the inner hole of the extrusion cylinder (6) is connected with the petal-shaped part of the overflow copper sleeve (202), so that the mold assembly (2) and the blank (4) are kept horizontal, and the high-pressure medium can flow from the overflow groove (202-1) of the overflow copper sleeve (202), the extrusion rod (7) moves right to the position where it does not separate from the extrusion cylinder sealing element (604), leaving enough space for liquid filling, so that the extrusion rod (7) does not separate from the extrusion cylinder sealing element (604); the liquid inlet and outlet hole (603) and the gas inlet and outlet hole (602) of the extrusion cylinder are opened, and the high-pressure medium is injected into the inner cavity of the extrusion cylinder (6) through the liquid filling device, when the liquid is discharged from the gas inlet and outlet hole (602), the liquid filling is completed; Step 4, extrusion: after the liquid filling is completed, the extrusion rod (7) moves left by a certain distance, and the excess high-pressure medium flows out from the gas inlet and outlet hole (602), so that the extrusion cylinder (6) moves to the extrusion position, and the extrusion rod (7) does not separate from the extrusion cylinder sealing element (604) during the movement of the extrusion cylinder (6) to the extrusion position, after the extrusion cylinder (6) moves to the extrusion position, the extrusion starts, and the blank (4) is extruded into a profile from the outlet of the mold (201) under the pressure of the high-pressure medium; Step 5, liquid discharge: after the extrusion is completed and the pressure of the extrusion rod (7) is released, the extrusion cylinder (6) moves right to the liquid discharge position, when the extrusion cylinder (6) is at the liquid discharge position, the mold assembly (2) is located at the left side of the inner cavity of the extrusion cylinder (6), and the high-pressure medium flows into the high-pressure medium collecting device (5) from the liquid inlet and outlet hole and the liquid discharge groove (601); Step 6, sawing and returning to the initial state: after the liquid discharge is completed, the extrusion cylinder (6) and the extrusion rod (7) move to the rightmost end of the initial state, the mold assembly (2) moves right by a certain distance and separates from the mold base (1), the extruded profile is sawed, the mold assembly (2) is removed, and the initial state is restored for the next extrusion.

Images