Pipe hydrostatic extrusion die

Abstract

The application discloses a kind of pipe static liquid extrusion mould, including extrusion cylinder, pressure medium exchange disc, extrusion shaft, mould, mould core and driving mechanism, the upper end of the extrusion cylinder is equipped with pressure medium exchange disc, the lower end of the extrusion shaft passes through pressure medium exchange disc and extends into extrusion cylinder, the lower end of the extrusion cylinder is equipped with mould, at least one side of the mould is equipped with finished product outlet with the cavity of mould communication, the driving end of the driving mechanism is equipped with the mould core of upper end and extends into the cavity of mould, compared with prior art, the drawbacks caused by the separation of existing technology pressure cylinder and extrusion cylinder can be avoided, and simple operation, extrusion efficiency is high.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of metal plastic forming, and particularly relates to a pipe hydrostatic extrusion die. BACKGROUND

[0002] Hydrostatic extrusion technology has become an important forming method for many materials, such as magnesium alloy, aluminum alloy, titanium alloy, high-temperature alloy, amorphous alloy, refractory metal and the like, due to its unique process advantages. However, the hydrostatic extrusion technology is relatively complex, and is mainly used for the forming of bar and wire. So far, through the search of the existing related technical documents, it is found that the Chinese patent with the authorization publication number CN106311783B and the name of a forming device for super-high-pressure hydrostatic extrusion of magnesium alloy pipe is disclosed. The technology is described as follows: a forming device for super-high-pressure hydrostatic extrusion of magnesium alloy pipe and a forming process thereof are disclosed, which adopts a horizontal structure as a whole, and comprises a pressurizing cylinder, an extrusion cylinder, a first pressure medium exchange disc, a second pressure medium exchange disc, a third pressure medium exchange disc, an extrusion die, a first heating sleeve, a second heating sleeve and a high-pressure hydraulic pump with an extrusion shaft. The pressurizing cylinder, the extrusion cylinder, the pressure medium exchange disc, the die and the high-pressure hydraulic pump are fixed between a movable beam and a fixed beam, and the movable beam and the fixed beam are connected through a tension column. The pressurizing cylinder and the extrusion cylinder are arranged in parallel and located in the same horizontal plane. However, since the pressurizing cylinder and the extrusion cylinder of the device are in a separated form, the super-high-pressure oil liquid is connected between the two through a high-pressure oil pipe, and the oil pressure is often as high as several hundred MPa or even thousands of MPa. Therefore, there are problems of oil leakage at the connection of the high-pressure oil pipe and the strength of the high-pressure oil pipe. In addition, the loading of the blank and the discharging of the extruded product need to disassemble the die, so that the operation is complex and the extrusion efficiency is low. SUMMARY

[0003] The purpose of the present application is to solve the problems in the prior art, and to provide a pipe hydrostatic extrusion die, which can avoid the disadvantages caused by the separated pressurizing cylinder and extrusion cylinder in the prior art, and has simple operation and high extrusion efficiency.

[0004] To achieve the above-mentioned purpose, the present application provides a pipe hydrostatic extrusion die, which comprises an extrusion cylinder, a pressure medium exchange disc, an extrusion shaft, a die, a die core and a driving mechanism. The upper end of the extrusion cylinder is provided with the pressure medium exchange disc. The lower end of the extrusion shaft penetrates into the extrusion cylinder through the pressure medium exchange disc. The lower end of the extrusion cylinder is provided with the die. At least one side surface of the die is provided with a finished product outlet which is in communication with the cavity of the die. The driving end of the driving mechanism is provided with the die core which penetrates into the cavity of the die.

[0005] Preferably, the die comprises a die body and a die support provided at the lower end of the die body. The die support is provided with a containing chamber which is in communication with the cavity of the die body. The cavity and the containing chamber cooperatively form the cavity.

[0006] Preferably, the mold support has finished product outlets that communicate with the receiving chamber on both the front and rear sides.

[0007] Preferably, the driving mechanism is a hydraulic cylinder.

[0008] Preferably, the system also includes a base worktable, on which the drive mechanism is mounted, and on which a support mechanism is provided, and on which an extrusion cylinder is provided.

[0009] Preferably, the support mechanism includes at least two support screws, a mounting base, and several nuts. The mounting base is sleeved on the support screw, and two nuts threadedly connected to each support screw are sleeved on each support screw. The two nuts are located at the upper and lower ends of the mounting base, respectively. The mounting base is provided with a through hole through which the mold can pass.

[0010] Preferably, the base worktable is provided with a support platform that supports the lower end of the mold.

[0011] Preferably, the extrusion cylinder includes an inner extrusion cylinder layer, an outer extrusion cylinder layer, and an inner liner cylinder, wherein the outer extrusion cylinder layer contains the inner extrusion cylinder layer, and the inner liner cylinder is located at the upper end of the mold within the inner extrusion cylinder layer.

[0012] Preferably, the upper end of the mold is located inside the inner layer of the extrusion cylinder, and the inner layer of the extrusion cylinder is a conical shape that is larger at the top and smaller at the bottom, and the inner wall of the outer layer of the extrusion cylinder is matched with the inner layer of the extrusion cylinder.

[0013] Preferably, at least two vertically placed billets can be stacked inside the extrusion cylinder.

[0014] The beneficial effects of this invention are as follows: This invention provides a pressure medium exchange plate at the upper end of the extrusion cylinder, and the lower end of the extrusion shaft extends into the extrusion cylinder through the pressure medium exchange plate. The extrusion shaft directly extends into the extrusion cylinder, compressing the extrusion medium to generate an ultra-high pressure extrusion cylinder, avoiding the drawbacks of the existing technology where the pressure cylinder and extrusion cylinder are separate. At least one side of the mold has a finished product outlet communicating with the mold cavity. The drive end of the drive mechanism has a mold core whose upper end extends into the mold cavity. The mold core can be adjusted in position by a hydraulic cylinder. When it is necessary to remove the finished pipe, the hydraulic cylinder drives the mold core to retract, removing it from the finished pipe without obstruction, and then the finished product can be removed from the finished pipe outlet. This avoids the drawback of the existing technology where the mold must be disassembled when extruding the finished pipe using hydrostatic pressure. Compared with the existing technology, it avoids the drawbacks caused by the existing technology where the pressure cylinder and extrusion cylinder are separate, and it is simple to operate and has high extrusion efficiency.

[0015] At least two vertically placed blanks can be stacked inside the extrusion cylinder. The upper blank seals the cavity between the mold and the mold core, preventing leakage of pressure oil inside the extrusion cylinder. It also enables continuous feeding, providing technical support for the automation of hydrostatic pipe extrusion.

[0016] This application adopts a vertical structural layout, which ensures good alignment between the extrusion shaft and the pressure medium exchange disc, and prevents uneven wear between the extrusion shaft and the pressure medium exchange disc due to gravity, thus preventing seal failure.

[0017] The features and advantages of the present invention will be described in detail through embodiments and in conjunction with the accompanying drawings. [Attached Image Description]

[0018] Figure 1 This is a schematic diagram of the structure of a pipe hydrostatic extrusion die according to the present invention.

[0019] In the diagram: 1-Extrusion cylinder, 2-Pressure medium exchange disc, 3-Extrusion shaft, 4-Die, 5-Die core, 6-Drive mechanism, 7-Finished product outlet, 8-Base worktable, 9-Support mechanism, 10-Support platform, 11-Inner layer of extrusion cylinder, 12-Outer layer of extrusion cylinder, 13-Inner liner, 14-Burnt material, 15-Finished pipe, 41-Die body, 42-Die support, 43-Accommodation chamber, 411-Cavity, 91-Support screw, 92-Mounting seat, 93-Nut, 94-Through hole.

Detailed Implementation Methods

[0020] See Figure 1This invention discloses a hydrostatic extrusion die for pipes, comprising an extrusion cylinder 1, a pressure medium exchange plate 2, an extrusion shaft 3, a die 4, a die core 5, and a drive mechanism 6. The upper end of the extrusion cylinder 1 is provided with the pressure medium exchange plate 2. The lower end of the extrusion shaft 3 passes through the pressure medium exchange plate 2 and extends into the extrusion cylinder 1. The lower end of the extrusion cylinder 1 is provided with the die 4. At least one side of the die 4 has a finished product outlet 7 communicating with the cavity of the die 4. The drive end of the drive mechanism 6 is provided with a die core 5, the upper end of which extends into the cavity of the die 4. The mold 4 includes a mold body 41 and a mold support 42 located at the lower end of the mold body 41. The mold support 42 has a receiving chamber 43 communicating with the cavity 411 of the mold body 41. The cavity 411 and the receiving chamber 43 cooperate to form a cavity. The front and rear sides of the mold support 42 are provided with finished product outlets 7 communicating with the receiving chamber 43. The driving mechanism 6 is a hydraulic cylinder and also includes a base worktable 8. The driving mechanism 6 is located on the base worktable 8. The base worktable 8 is provided with a support mechanism 9. The support mechanism 9 is provided with an extrusion cylinder 1. The support mechanism 9 includes at least two support screws 91, a mounting base 92, and several nuts 93. The mounting base 92 is sleeved on the support screw 91. Two nuts 93 are threadedly connected to each support screw 91. The two nuts 93 are located at the upper and lower ends of the mounting base 92, respectively. The mounting base 92 has a through hole 94 through which the mold 4 can pass. The base worktable 8 is provided with a support plate that supports the lower end of the mold 4. The extrusion cylinder 1 includes an inner extrusion cylinder layer 11, an outer extrusion cylinder layer 12, and an inner liner cylinder 13. The outer extrusion cylinder layer 12 contains the inner extrusion cylinder layer 11, and the inner liner cylinder 13 is located at the upper end of the mold 4 within the inner extrusion cylinder layer 11. The upper end of the mold 4 is located within the inner extrusion cylinder layer 11. The inner extrusion cylinder layer 11 has a conical shape that is larger at the top and smaller at the bottom. The inner wall of the outer extrusion cylinder layer 12 is fitted with the inner extrusion cylinder layer 11. At least two vertically placed billets 14 can be stacked inside the extrusion cylinder 1.

[0021] The mold 4, the pressure medium exchange disc 2, and the inner layer 11 of the extrusion cylinder are fitted together and sealed by a metal sealing structure; the pressure medium exchange disc 2 and the extrusion shaft 3 are fitted together with a clearance and sealed by a metal sealing structure. The outer layer 12 of the extrusion cylinder is fixedly connected to the mounting base 92 by bolts; the mold core 5 is fixedly connected to the piston of the hydraulic cylinder.

[0022] Working process of this invention:

[0023] In the operation of this invention, a hydrostatic extrusion die for pipes involves stacking two blanks 14 sequentially inside an extrusion cylinder 1, with the lower end of the lower blank 14 positioned within the die body 41 and interference-fitted therewith. An oil pump then fills the extrusion cylinder 1 with extrusion medium. The extrusion shaft 1 moves downwards under the drive of a hydraulic pump, compressing the extrusion medium to generate ultra-high pressure exceeding 400 MPa. The lower blank 14, under hydrostatic pressure, is expanded and extruded between the die body 41 and the die core 5, forming a pipe. The finished pipe finally enters the receiving chamber 43, while the upper blank 14 enters the cavity between the die body 41 and the die core 5, sealing the cavity. Then, a hydraulic cylinder is activated to retract the die core 5 downwards until it is completely removed from the finished pipe 15, ensuring it does not obstruct the removal of the finished pipe 15. The finished pipe 15 can then be removed from the finished product outlet 7.

[0024] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the scope of protection of the present invention.

Claims

1. A pipe hydrostatic extrusion die, characterized in that: The device includes an extrusion cylinder (1), a pressure medium exchange plate (2), an extrusion shaft (3), a mold (4), a mold core (5), and a drive mechanism (6). The upper end of the extrusion cylinder (1) is provided with a pressure medium exchange plate (2). The lower end of the extrusion shaft (3) extends into the extrusion cylinder (1) through the pressure medium exchange plate (2). The lower end of the extrusion cylinder (1) is provided with a mold (4). At least one side of the mold (4) is provided with a finished product outlet (7) communicating with the cavity of the mold (4). The drive end of the drive mechanism (6) is provided with a mold core (5) whose upper end extends into the cavity of the mold (4). The device also includes a base worktable (8). The drive mechanism (6) is located on the base worktable (8). The base worktable (8) is provided with a support mechanism (9). The support mechanism (9) is provided with the extrusion cylinder (1). The support mechanism (9) includes at least two support screws (91) and a mounting base (92). 92) and several nuts (93), the support screw (91) is fitted with a mounting seat (92), the support screw (91) is fitted with two nuts (93) threaded to it, the two nuts (93) are located at the upper and lower ends of the mounting seat (92) respectively, the mounting seat (92) is provided with a through hole (94) through which the mold (4) can pass, the extrusion cylinder (1) includes an inner extrusion cylinder layer (11), an outer extrusion cylinder layer (12) and an inner liner (13), the outer extrusion cylinder layer (12) is provided with the inner extrusion cylinder layer (11), the inner extrusion cylinder layer (11) is provided with the inner liner (13) located at the upper end of the mold (4), the upper end of the mold (4) is located in the inner extrusion cylinder layer (11), the inner extrusion cylinder layer (11) is a conical shape with a larger upper part and a smaller lower part, the inner wall of the outer extrusion cylinder layer (12) is matched with the inner extrusion cylinder layer (11).

2. The pipe hydrostatic extrusion die as described in claim 1, characterized in that: The mold (4) includes a mold body (41) and a mold support (42) located at the lower end of the mold body (41). The mold support (42) is provided with a receiving chamber (43) that communicates with the cavity (411) of the mold body (41). The cavity (411) and the receiving chamber (43) cooperate to form a cavity.

3. The pipe hydrostatic extrusion die as described in claim 2, characterized in that: The mold support (42) has finished product outlets (7) on both the front and rear sides that are connected to the receiving chamber (43).

4. The pipe hydrostatic extrusion die as described in claim 1, characterized in that: The drive mechanism (6) is a hydraulic cylinder.

5. The pipe hydrostatic extrusion die as described in claim 1, characterized in that: The base workbench (8) is provided with a support platform (10) that supports the lower end of the mold (4).

6. A pipe hydrostatic extrusion die according to any one of claims 1 to 5, characterized in that: At least two vertically placed billets (14) can be stacked inside the extrusion cylinder (1).

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