Device for preventing powder clamping of powder metallurgy pressing forming die

Abstract

The utility model discloses a device for preventing powder clamping of a powder metallurgy pressing forming die. The device comprises a supporting piece. The connecting piece is of a rectangular structure and is vertically mounted at the top of the supporting piece, and a mounting groove is formed in the outer side of the connecting piece; the powder scraping piece is arranged in one end, close to the pressing piece, of the mounting groove; and the pressing piece is mounted at the top of the connecting piece. The powder scraping piece is arranged in the mounting groove in the outer side of the connecting piece, in the process that the pressing piece and the female die relatively move to apply pressure to powder, the powder scraping piece can effectively scrape powder attached to the female die, and the working efficiency is improved while die clamping is prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of powder metallurgy, and in particular relates to a device for preventing powder from being stuck in a powder metallurgy pressing and forming die. Background Art

[0002] Powder metallurgy pressing, also known as die pressing, is a method of powder metallurgy forming green body. The main process is to put the powder into the mold and press the powder into a green body with a certain shape, density and strength through external pressure. The mold is generally composed of an upper punch, a female die and a lower punch. Its pressing forming process is mainly divided into powder filling (powder loading), pressing and demolding. According to the relativity of movement, the female die can be selected as a fixed reference for easy explanation. Relative to the female die, powder filling is the movement of the lower punch downward in the female die to form a cavity, and then the powder shoe moves to the top of the cavity, and the powder in the powder shoe falls freely into the cavity; pressing is generally bidirectional pressing. After the powder is filled, the upper punch moves down to contact the powder to close the cavity, and then the upper punch moves down and the lower punch moves up to apply pressure to the powder in the cavity to form a green body; the demolding process is that after the pressing is completed, the upper punch moves up and the lower punch pushes the green body, and the cycle repeats over and over again. This is the pressing production process of powder metallurgy.

[0003] Because the upper punch and the lower punch have relative motion, there is a gap between the upper punch and the lower punch and the female die, and the gap is generally between 20-50um; the powder used in iron-based powder metallurgy pressing and forming generally has a particle size distribution of -100 to +250 mesh, about 58-150um. Because the iron powder is relatively hard, it is not easy for the powder particles to run to the inner wall of the female die during pressing. However, when pressing soft powders, such as aluminum alloy powder, or fine powder with a particle size of less than 50um, the powder easily enters the gap between the female die and the upper and lower punches. During pressing, the powder sticks to the inner wall of the female die and is compacted. When filling the powder again, new fine powder falls into the inner wall of the female die. In the repeated cooperation between the upper and lower punches and the female die, a compression tumor will be formed on the inner wall of the female die, causing the mold to be pulled. At present, the removal of powder can only be done manually after the operation is completed, which is inefficient and affects production. Utility Model Content

[0004] The utility model aims to solve the problems in the prior art and provides a device for preventing powder metallurgy pressing and forming dies from getting stuck.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A device for preventing powder from being stuck in a powder metallurgy pressing die, comprising:

[0007] Supports;

[0008] The connecting member is a rectangular structure and is vertically installed on the top of the supporting member, and a mounting groove is provided on the outer side of the connecting member;

[0009] A powder scraping member is arranged in one end of the mounting groove close to the pressing member;

[0010] A pressing piece is installed on the top of the connecting piece.

[0011] Preferably, a plurality of the powder scraping members are provided, and the plurality of powder scraping members are sequentially spaced around the mounting groove.

[0012] Preferably, the cross section of the powder scraping member is a parallelogram.

[0013] Preferably, the powder scraping members have a rectangular cross section and are arranged in two rows in a staggered manner.

[0014] Preferably, the powder scraping member is a long strip structure.

[0015] Preferably, the powder scraping member is axially perpendicular to the mounting groove.

[0016] Preferably, the height of the powder scraper is 3.5 mm.

[0017] Preferably, the powder scraping member is bristle.

[0018] Preferably, the pressed part is also a rectangular structure.

[0019] Preferably, the connecting member is an extension rod.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] 1. By arranging a powder scraper in the installation groove outside the connecting piece, the powder scraper can effectively scrape off the powder attached to the female mold during the process of applying pressure to the powder by relative movement between the pressing piece and the female mold, thereby preventing mold jamming and improving working efficiency.

[0022] 2. Multiple powder scraping parts are arranged in sequence and at intervals around the installation groove, which can completely scrape off the powder attached to the female mold without dead angles, and the scraping efficiency is high.

[0023] 3. Designing the cross section of the powder scraper to be a parallelogram can reduce the overlapping area between the brushes and improve work efficiency.

[0024] 4. The cross section of the powder scraper is designed to be rectangular and arranged in two rows in a staggered manner, which can effectively utilize the space so that the powder scraper can accommodate more powder in a limited area, thereby improving the scraping ability.

[0025] 5. The powder scraper is designed as a long strip structure, which can make the powder scraper bear the force more evenly during the powder scraping process and reduce the problem of local wear. Compared with other shapes, the long strip powder scraper can better disperse the pressure when subjected to force and extend the service life.

[0026] 6. The scraper is axially perpendicular to the mounting groove, which enables the scraper to maintain a stable position during operation, reduces shaking or deviation of the scraper during movement, and thus improves the stability of the scraping process.

[0027] 7. The powder scraper is a brush that can scrape off the powder more effectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of filling powder in the prior art;

[0030] Figure 2 It is a schematic diagram of a closed cavity in the prior art;

[0031] Figure 3 It is a schematic diagram of bidirectional pressing of powder in the prior art;

[0032] Figure 4 It is a schematic diagram of demoulding in the prior art;

[0033] Figure 5 It is a schematic diagram of the working gap of the prior art;

[0034] Figure 6 It is an enlarged schematic diagram of the working gap of the prior art;

[0035] Figure 7 This is an overall schematic diagram of a device for preventing powder from being stuck in a powder metallurgy pressing die provided by the utility model;

[0036] Figure 8 The overall cross-sectional schematic diagram of the device for preventing powder from being stuck in a powder metallurgy pressing forming die provided by the utility model;

[0037] Fig. 9 The cross section of the powder scraper in the device for preventing powder jamming in a powder metallurgy pressing forming die provided by the utility model is a schematic diagram of a parallelogram;

[0038] Fig.10The cross section of the powder scraper in the device for preventing powder jamming in a powder metallurgy pressing forming die provided by the utility model is a schematic diagram of a rectangle;

[0039] Fig.11 The powder scraping member in the device for preventing powder metallurgy pressing and forming mold from getting stuck provided by the utility model is a schematic diagram of a long strip structure.

[0040] Among them: 1. female mold; 2. powder feeding shoe; 3. upper punch; 4. lower punch; 5. green embryo; 6. mold gap; 7. pressed part; 701, working surface; 8. connecting part; 801, mounting groove; 9. powder scraping part; 10. supporting part. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Generally, the components of the embodiment of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0044] In the description of the embodiments of the present utility model, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invented product is usually placed when in use, it is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0045] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0046] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0047] like Figure 1-Figure 6 As shown, it is a schematic diagram of the cooperation between the upper punch 3 and the lower punch 4 and the female die 1 in the prior art. Figure 1 is a schematic diagram of powder filling. Figure 1 In the process, the lower punch 4 slowly moves downward in the female mold 1 to form a mold cavity, and the powder feeding shoe 2 pours the powder into the mold cavity to complete the powder filling process; Figure 2 As shown, after the powder filling is completed, the upper punch 3 and the lower punch 4 move toward each other in the die cavity to close the die cavity; Figure 3 As shown, after the die cavity is closed, the upper punch 3 and the lower punch 4 start to move to press the powder to form a green embryo; Figure 4 As shown, the upper punch 3 moves upward, and the lower punch 4 moves upward and ejects the green blank, thereby achieving demolding; Figure 5 and Figure 6 As shown, during the process of the upper punch 3 and the lower punch 4 pressing the powder, since there is a gap between the upper punch 3 and the lower punch 4 and the female mold 1, the powder during the pressing process will move to the inner wall of the female mold 1 and adhere to the inside of the female mold 1, so that a pressing tumor will be formed on the inner wall of the female mold 1, causing the mold to be stretched.

[0048] In order to solve the problem that powder forms a compression nodule on the inner wall of the female die 1 and causes damage to the die (the die here includes an upper punch 3, a lower punch 4 and the female die 1), this embodiment provides a device to prevent powder from getting stuck in the powder metallurgy pressing die.

[0049] Embodiment 1:

[0050] A device for preventing powder metallurgy pressing mold from sticking powder, such as Figure 7 and Figure 8As shown, it includes: a support member 10; a connecting member 8, which is a rectangular structure and is vertically installed on the top of the support member 10, and a mounting groove 801 is opened on the outer side of the connecting member 8; a powder scraper 9 is arranged in one end of the mounting groove 801 close to the pressing member 7, and the powder scraper 9 and the mounting groove 801 are axially perpendicular, so that the powder scraper 9 can maintain a stable position during operation, reducing the shaking or deviation of the powder scraper 9 during movement, thereby improving the stability of the powder scraping process; the pressing member 7, which is also a rectangular structure, is installed on the top of the connecting member 8 and is used to press the powder. The longer side of the pressing member 7 is the effective working surface 701, which is in contact with the inside of the female mold 1, has a high surface finish, and can avoid powder sticking. Furthermore, during the process of the pressing member 7 pressing the powder downward in the mold cavity, the powder scraping member 9 located in the installation groove 801 can scrape off the powder attached to the inner wall of the female mold 1 (mold cavity); in this embodiment, a plurality of powder scraping members 9 are provided, and the plurality of powder scraping members 9 are sequentially arranged around the installation groove 801 at intervals. Specifically, the cross section of the powder scraping member 9 is a parallelogram, such as Fig. 9 As shown, the cross section of the powder scraping member 9 is designed to be a parallelogram, which can reduce the overlapping area of ​​the operation and improve the work efficiency during the powder scraping process.

[0051] In this embodiment, the powder scraping member 9 is preferably a brush bristle, and the material of the brush bristle can be hard bristle or chemical fiber bristle, but is not limited thereto. Secondly, the height of the powder scraping member 9 is preferably 3.5 mm.

[0052] In this embodiment, the connecting member 8 is preferably an extension rod.

[0053] In this embodiment, the support member 1 is preferably a disc-mounted structure.

[0054] Embodiment 2:

[0055] like Fig.10 As shown, the difference from the first embodiment is that in this embodiment, the cross-section of the powder scraper 9 is rectangular and is arranged in two rows in a staggered manner, which can effectively utilize the space so that the powder scraper can accommodate more powder in a limited area, thereby improving the scraping ability.

[0056] Embodiment three:

[0057] like Fig.11 As shown, the difference from Example 1 and Example 2 is that, in this embodiment, the powder scraper 9 is a long strip structure, which can make the powder scraper 9 bear the force more evenly during the scraping process and reduce the problem of local wear. Compared with other shapes, the long strip powder scraper 9 can better disperse the pressure when subjected to force, thereby extending the service life of the powder scraper 9.

[0058] In summary, the device is used to replace the existing upper punch and lower punch, and when the device cooperates with the female die to press the powder, the powder attached to the inner wall of the female die can be effectively scraped off.

[0059] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for preventing powder from being stuck in a powder metallurgy pressing die, characterized in that: include: Support member (10); The connecting member (8) is a rectangular structure and is vertically mounted on the top of the supporting member (10). A mounting groove (801) is provided on the outer side of the connecting member (8); A powder scraper (9) is arranged in one end of the mounting groove (801) close to the pressing piece (7); A pressing piece (7) is installed on the top of the connecting piece (8).

2. The device according to claim 1, characterized in that A plurality of the powder scraping members (9) are provided, and the plurality of powder scraping members (9) are sequentially arranged at intervals around the installation groove (801).

3. The device according to claim 2, characterized in that The cross section of the powder scraping member (9) is a parallelogram.

4. The device according to claim 2, characterized in that The powder scraping members (9) have a rectangular cross section and are arranged in two rows in a staggered manner.

5. The device according to claim 2, characterized in that The powder scraping member (9) is a long strip structure.

6. The device according to any one of claims 1 to 5, characterized in that: The powder scraping member (9) and the mounting groove (801) are axially perpendicular to each other.

7. The device according to claim 6, characterized in that The height of the powder scraper (9) is 3.5 mm.

8. The device according to claim 6, characterized in that The powder scraping member (9) has bristles.

9. The device according to claim 1, characterized in that The pressed part (7) is also a rectangular structure.

10. The device according to claim 1, characterized in that The connecting piece (8) is an extension rod.

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