Powder metallurgy press die ejector rod structure for preventing green compact deformation

Abstract

The utility model relates to powder metallurgy equipment technical field, concretely to a kind of powder metallurgy pressing mould ejector rod structure for preventing green compact deformation, including base, the top of base is fixedly connected with mould, the die cavity bottom of mould is passed through and is equipped with several ejection grooves, the outer wall of connecting sleeve is fixedly connected with ejector rod main body, the end of ejector rod main body away from connecting sleeve is fixedly installed with buffer assembly, and the side of buffer assembly away from connecting sleeve is fixedly connected with ejection plate;Beneficial effects are that: after the ejection plate of the equipment setting contacts green compact, movable rod is retracted to the circular groove on buffer casing by reaction force, sliding in shaft cylinder is promoted, and cooperate with connecting hole, through-hole and air exchange hole pressure relief buffer, avoid directly rigid ejection to cause green compact deformation, simultaneously, air exchanged from air exchange hole is connected to sliding base by connecting hole and through-hole, sliding base is air-cooled and radiated, avoid sliding friction temperature rise in sliding groove to cause its thermal damage, prolong its service life.

Description

Technical Field

[0001] This utility model relates to the field of powder metallurgy equipment, specifically to a top rod structure for a powder metallurgy pressing mold that prevents deformation of the pressed blank. Background Technology

[0002] A pressed preform is an intermediate preform prepared by powder cold pressing or injection molding processes. It is mainly used in the field of powder metallurgy. During the pressing stage, pressure is applied by a rigid mold to make powder particles aggregate and form a preform. Common processes include cold closed mold pressing, cold isostatic pressing and metal injection molding. The pressed preform has the characteristics of an unsintered preform, and its forming quality directly affects the performance of the final product.

[0003] The hydraulic rod drives the pressure plate downwards, squeezing the inclined block as it moves. This causes the moving rod to move outwards through the spring telescopic rod, preventing the arc plate from contacting the bottom of the ejector rod. After pressing, the pressure plate returns to its original position, and the moving rod returns to its original position under the elastic potential energy of the spring telescopic rod. This causes the arc plate to lift the ejector rod, thereby lifting the workpiece inside the gear mold cavity. After manual removal, the hydraulic rod moves downwards again, causing the pressure plate to compress the moving rod and reset the ejector rod. This prevents the ejector rod from not resetting during filling.

[0004] In traditional powder metallurgy pressing mold ejector pin structures, ejector pins are usually ejected directly by hydraulic or mechanical means to eject the already pressed blank from the mold. This method of ejector pins directly impacting and ejecting the blank can easily cause deformation or even damage to the blank, resulting in a high blank damage rate. Utility Model Content

[0005] The purpose of this invention is to provide a top rod structure for a powder metallurgy pressing die to prevent deformation of the pressed blank, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a powder metallurgy pressing mold ejector structure for preventing deformation of the pressed blank, comprising a base, a mold fixedly connected to the top of the base, a plurality of ejector slots being opened through the bottom of the mold cavity of the mold, the ejector slots being distributed in a linear array, a drive motor fixedly installed on the outer wall of the base, a disc fixedly connected to the output end of the drive motor, a rotating shaft fixedly connected to the outer wall of the disc, a connecting sleeve rotatably connected to the outer wall of the rotating shaft, an ejector body fixedly connected to the outer wall of the connecting sleeve, a buffer assembly fixedly installed at the end of the ejector body away from the connecting sleeve, and an ejector plate fixedly connected to the side of the buffer assembly away from the connecting sleeve.

[0007] Preferably, the outer diameter of the ejector plate matches the inner diameter of the ejector groove, an installation shaft is rotatably mounted on the inner wall of the base, a drive gear is fixedly connected to the outer wall of the installation shaft, and the end of the installation shaft away from the inner wall of the base is fixedly connected to the outer wall of the disc.

[0008] Preferably, the buffer assembly includes a buffer housing fixedly installed at the end of the top rod body away from the connecting sleeve, and a circular groove is formed through the side of the buffer housing away from the top rod body.

[0009] Preferably, a movable rod is slidably connected to the inner wall of the circular groove, and the end of the movable rod away from the circular groove is fixedly connected to the outer surface of the ejector plate. A sliding groove is provided through the outer wall of the buffer housing.

[0010] Preferably, a slide block is slidably connected to the inner wall of the slide groove, and an air vent is provided through the outer surface of the slide block. A filter screen is detachably installed on the outer surface of the slide block.

[0011] Preferably, a shaft is fixedly connected to the bottom of the inner cavity of the buffer housing, and a shaft cylinder is slidably connected to the outer wall of the shaft. The end of the shaft cylinder away from the shaft is fixedly connected to the end of the movable rod away from the ejector plate, and the side of the slide block away from the slide groove is fixedly connected to the outer surface of the movable rod.

[0012] Preferably, a through hole is provided on the side of the shaft cylinder near the movable rod, and a connecting hole is provided on the side of the movable rod near the shaft cylinder. The connecting hole, the through hole, and the ventilation hole are interconnected, and a spring is sleeved on the outer wall of the shaft cylinder.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: After the ejector plate of the device contacts the compact, the movable rod is subjected to a reaction force and retracts into the circular groove on the buffer housing, pushing the shaft to slide inside the shaft cylinder. The spring works in conjunction with the pressure relief buffer through the connecting hole, through hole, and vent hole, achieving adaptive ejection force adjustment and avoiding deformation of the compact caused by direct rigid ejection. At the same time, the air exchanged from the vent hole is connected to the slide block through the connecting hole and through hole to provide air cooling for the slide block, preventing the slide block from heating up due to sliding friction in the slide groove and causing thermal damage, thus extending its service life.

[0014] This utility model proposes a top rod structure for a powder metallurgy pressing die to prevent deformation of the pressed blank. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of the base of this utility model;

[0017] Figure 3This is a schematic diagram of the main structure of the top rod of this utility model;

[0018] Figure 4 This is a schematic diagram of the buffer component structure of this utility model;

[0019] Figure 5 This is a schematic diagram of the internal structure of the buffer component of this utility model.

[0020] In the diagram: 1. Base; 2. Drive motor; 3. Mold; 4. Ejector plate; 5. Buffer assembly; 501. Buffer housing; 502. Slide groove; 503. Slide block; 504. Movable rod; 505. Circular groove; 506. Shaft cylinder;

[0021] 507. Ventilation port; 508. Connection hole; 509. Filter screen; 510. Through hole; 511. Shaft; 6. Top groove; 7. Drive gear; 8. Disc; 9. Connecting sleeve; 10. Top rod body. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clear and complete, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this utility model, and are merely used to explain the embodiments of this utility model. They are not intended to limit the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] Example 1

[0024] Please see Figures 1-5 This utility model provides a technical solution: a powder metallurgy pressing mold ejector structure for preventing deformation of the pressed blank, including a base 1, a mold 3 fixedly connected to the top of the base 1, a plurality of ejector grooves 6 extending through the bottom of the mold cavity of the mold 3, the ejector grooves 6 being arranged in a linear array, a drive motor 2 fixedly installed on the outer side wall of the base 1, a disc 8 fixedly connected to the output end of the drive motor 2, a rotating shaft fixedly connected to the outer wall of the disc 8, a connecting sleeve 9 rotatably connected to the outer wall of the rotating shaft, an ejector body 10 fixedly connected to the outer wall of the connecting sleeve 9, a buffer assembly 5 fixedly installed at the end of the ejector body 10 away from the connecting sleeve 9, and an ejector plate 4 fixedly connected to the side of the buffer assembly 5 away from the connecting sleeve 9.

[0025] Example 2

[0026] Based on Embodiment 1, the outer diameter of the ejector plate 4 matches the inner diameter of the ejector groove 6. An installation shaft is rotatably mounted on the inner wall of the base 1. A drive gear 7 is fixedly connected to the outer wall of the installation shaft. The end of the installation shaft away from the inner wall of the base 1 is fixedly connected to the outer wall of the disc 8. The buffer assembly 5 includes a buffer housing 501 fixedly mounted on the end of the push rod body 10 away from the connecting sleeve 9. A circular groove 505 is provided through the side of the buffer housing 501 away from the push rod body 10.

[0027] Example 3

[0028] Based on Embodiment 2, a movable rod 504 is slidably connected to the inner wall of the circular groove 505. The end of the movable rod 504 away from the circular groove 505 is fixedly connected to the outer surface of the ejector plate 4. A sliding groove 502 is provided through the outer wall of the buffer housing 501. A sliding seat 503 is slidably connected to the inner wall of the sliding groove 502. A ventilation hole 507 is provided through the outer surface of the sliding seat 503. A filter screen 509 is detachably installed on the outer surface of the sliding seat 503.

[0029] Example 4

[0030] Based on Embodiment 3, a shaft 511 is fixedly connected to the bottom of the inner cavity of the buffer housing 501, and a shaft cylinder 506 is slidably connected to the outer wall of the shaft 511. The end of the shaft cylinder 506 away from the shaft 511 is fixedly connected to the end of the movable rod 504 away from the ejector plate 4. The side of the slide block 503 away from the slide groove 502 is fixedly connected to the outer surface of the movable rod 504. A through hole 510 is provided through the side of the shaft cylinder 506 near the movable rod 504, and a connecting hole 508 is provided on the side of the movable rod 504 near the shaft cylinder 506. The connecting hole 508, the through hole 510, and the ventilation hole 507 are interconnected. A spring is sleeved on the outer wall of the shaft cylinder 506.

[0031] In actual use, the drive motor 2 drives the disc 8 and the rotating shaft to rotate, which in turn drives the connecting sleeve 9 and the ejector rod body 10 to move up and down. This pushes the ejector plate 4 to move upward and eject the pressed blank formed in the mold 3. After the ejector plate 4 contacts the pressed blank, the movable rod 504 is subjected to a reaction force and retracts towards the circular groove 505 on the buffer housing 501, pushing the shaft 511 to slide inside the shaft cylinder 506. This, combined with the spring, achieves buffering. It also works with the connecting hole 508, through hole 510, and vent hole 507 to relieve pressure and buffer, achieving adaptive ejection force adjustment and avoiding direct... The rigid ejection causes deformation of the pressed blank. The slide 503 slides in the slide groove 502, limiting the stroke of the movable rod 504 and preventing excessive compression. At the same time, the shaft 511 slides in the shaft cylinder 506. The air exchanged from the ventilation hole 507 is connected to the slide 503 through the connecting hole 508 and the through hole 510 to cool the slide 503. This prevents the slide 503 from heating up due to sliding friction in the slide groove 502 and causing thermal damage. The filter screen 509 is used to prevent powder from entering the shaft cylinder 506 through the ventilation hole 507 on the slide 503.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A powder metallurgy press die ejector rod structure for preventing green compact deformation, characterized by: The device includes a base (1), a mold (3) is fixedly connected to the top of the base (1), and a plurality of ejector slots (6) are opened through the bottom of the mold cavity of the mold (3). The ejector slots (6) are arranged in a linear array. A drive motor (2) is fixedly installed on the outer wall of the base (1). A disc (8) is fixedly connected to the output end of the drive motor (2). A rotating shaft is fixedly connected to the outer wall of the disc (8). A connecting sleeve (9) is rotatably connected to the outer wall of the rotating shaft. A push rod body (10) is fixedly connected to the outer wall of the connecting sleeve (9). A buffer assembly (5) is fixedly installed at the end of the push rod body (10) away from the connecting sleeve (9). An ejector plate (4) is fixedly connected to the side of the buffer assembly (5) away from the connecting sleeve (9).

2. A powder metallurgy press die ejector rod structure for preventing the deformation of a compact according to claim 1, characterized in that: The outer diameter of the ejector plate (4) matches the inner diameter of the ejector groove (6). The inner wall of the base (1) is rotatably mounted with an installation shaft. The outer wall of the installation shaft is fixedly connected with a drive gear (7). One end of the installation shaft away from the inner wall of the base (1) is fixedly connected to the outer wall of the disc (8).

3. A powder metallurgy press die ejector rod structure for preventing the deformation of a compact according to claim 1, characterized in that: The buffer assembly (5) includes a buffer housing (501) fixedly installed on the end of the top rod body (10) away from the connecting sleeve (9), and a circular groove (505) is provided through the side of the buffer housing (501) away from the top rod body (10).

4. A powder metallurgy press die ejector rod structure for preventing the deformation of a compact according to claim 3, characterized in that: The inner wall of the circular groove (505) is slidably connected to a movable rod (504), and the end of the movable rod (504) away from the circular groove (505) is fixedly connected to the outer surface of the ejector plate (4). The outer wall of the buffer housing (501) is provided with a sliding groove (502).

5. A powder metallurgy press die ejector rod structure for preventing the deformation of a compact according to claim 4, characterized in that: The inner wall of the slide groove (502) is slidably connected to a slide block (503), and the outer surface of the slide block (503) is provided with a ventilation hole (507). A filter screen (509) is detachably installed on the outer surface of the slide block (503).

6. A powder metallurgy press die ejector rod structure for preventing the deformation of a compact according to claim 5, characterized in that: The inner cavity bottom of the buffer housing (501) is fixedly connected to a shaft (511), and the outer wall of the shaft (511) is slidably connected to a shaft cylinder (506). The end of the shaft cylinder (506) away from the shaft (511) is fixedly connected to the end of the movable rod (504) away from the ejector plate (4). The side of the slide block (503) away from the slide groove (502) is fixedly connected to the outer surface of the movable rod (504).

7. The ejector pin structure for preventing deformation of a powder metallurgy pressing die according to claim 6, characterized in that: The shaft cylinder (506) has a through hole (510) on the side near the movable rod (504), and the movable rod (504) has a connecting hole (508) on the side near the shaft cylinder (506). The connecting hole (508), the through hole (510), and the ventilation hole (507) are interconnected. A spring is fitted on the outer wall of the shaft cylinder (506).

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