Powder metallurgy die with false punching structure

Abstract

The utility model relates to a powder metallurgy die with a false punching structure, which comprises a forming upper punch, a forming middle die and a forming lower punch, the upper end face of the forming middle die is provided with a forming cavity, the forming cavity comprises a forming bottom surface, a mounting through hole and a through hole are vertically arranged in the forming bottom surface in a penetrating manner, the forming lower punch is provided with a lower punching forming rod, and the forming lower punch is provided with a lower punching forming rod. The lower forming punch is arranged in the mounting through hole in a matched mode, the corresponding lower punching forming rod is arranged in the penetrating hole, the end face of the lower punching forming rod protrudes out of the forming bottom face, and a circular groove corresponding to the lower punching forming rod is formed in the lower end face of the upper forming punch. The end face of the lower punching forming rod protrudes out of the forming bottom face, so that false punching is formed, when powder is formed, through the action of the lower punching forming rod, powder on the forming lower portion of the boss is jacked to the upper portion of the boss, and therefore the density of the boss is improved, and the use strength of customers is met. In addition, a shaft body does not need to be purchased for installation, the cost is reduced, meanwhile, the technological process is reduced, and the production efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of powder metallurgy molds, in particular to a powder metallurgy mold with a false punch structure. Background Art

[0002] Powder metallurgy is a process technology that uses metal or metal powder as raw materials, through molding and sintering, to manufacture metal materials, composites and various types of products. The molding die is the key equipment in the production process of powder metallurgy products. When molding some products with bosses on the surface, such as attached Figure 3 As shown, the end face of the product 10 has a plurality of relatively high bosses 11. In the design of traditional powder metallurgy molds, a groove for forming the boss is generally provided on the forming end face of the upper punch. Since the boss 11 is relatively high, the density after forming will not meet the customer's usage strength requirements. Therefore, in the prior art, powder metallurgy products do not directly form the boss, but reserve a hole, and then purchase a shaft of the same size as the boss, and the shaft is press-fitted into the reserved hole by interference fit. Therefore, this production method is inefficient, complicated in process, and costly. Utility Model Content

[0003] The utility model aims to solve one of the problems existing in the existing related technologies at least to a certain extent. To this end, the utility model provides a powder metallurgy die with a false punch structure.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A powder metallurgy mold with a false punch structure includes a forming upper punch, a forming middle die and a forming lower punch, the upper end face of the forming middle die is provided with a forming cavity, the forming cavity includes a forming bottom face, the forming bottom face has mounting through holes and through holes extending up and down, a lower punch forming rod is provided on the forming lower punch, the forming lower punch is cooperatedly arranged in the mounting through hole, the corresponding lower punch forming rod is arranged in the through hole, and the end face of the lower punch forming rod protrudes from the forming bottom face, and the lower end face of the forming upper punch is provided with a circular groove corresponding to the lower punch forming rod.

[0006] In some embodiments, a first circular hole for installing the lower punch forming rod is provided on the forming lower punch, a first limiting circular groove is provided at the lower end of the first circular hole, a first core rod base is provided at the lower end of the lower punch forming rod, the lower punch forming rod is arranged in the first circular hole, the first core rod base is arranged in the first limiting circular groove, and a lower punching plate is provided at the bottom end of the forming lower punch.

[0007] In some embodiments, one or more first gaskets are disposed between the first limiting circular groove and the first mandrel base, and the first gaskets are sleeved on the lower punch forming rod.

[0008] In some embodiments, a second circular hole is formed in the forming upper punch, and an upper punch forming rod is disposed in the second circular hole. The upper punch forming rod penetrates through the second circular hole from top to bottom, and the lower end surface of the upper punch forming rod does not protrude from the lower end surface of the forming upper punch, so that a circular groove is formed between the lower end surface of the upper punch forming rod and the inner wall of the second circular hole.

[0009] In some embodiments, a second limiting groove is provided at the upper end of the second circular hole, a second mandrel base is provided at the upper end of the upper punch forming rod, the second mandrel base is disposed in the second limiting groove, and one or more second gaskets are further disposed between the second mandrel base and the second limiting groove. The second gaskets are sleeved on the upper punch forming rod, and an upper punch pressing plate is provided at the upper end of the forming upper punch.

[0010] In some embodiments, the material of the lower punch forming rod is tungsten carbide.

[0011] In some embodiments, the material of the upper punch forming rod is tungsten carbide.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows: by providing a lower punch forming rod, the end surface of the lower punch forming rod protrudes from the forming bottom surface to form a false punch. When powder is formed, under the action of the lower punch forming rod, the powder at the lower part of the convex platform is pushed to the upper part of the convex platform, so as to increase the density of the convex platform and meet the use strength requirements of customers; in addition, there is no need to purchase an external shaft body for installation, which reduces costs and at the same time reduces the process, greatly improving the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is an exploded structural schematic diagram of the present utility model;

[0014] Figure 2 is a structural schematic diagram when the present utility model is combined;

[0015] Figure 3 is a structural schematic diagram of a powder metallurgy product. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following specific implementation content provides various different embodiments or examples for implementing the present utility model. Of course, these are only embodiments or examples and are not intended to be restrictive. In addition, repeated reference numerals may be used in different embodiments, such as repeated numbers and / or letters. These repetitions are for the purpose of simply and clearly describing the present utility model and do not represent a specific relationship between the different embodiments and / or structures discussed.

[0017] As Figures 1 - 3 shown, a powder metallurgy mold with a false punching structure includes a forming upper punch 1, a forming middle die 2, and a forming lower punch 3. A forming cavity 4 is provided on the upper end surface of the forming middle die 2. The forming cavity 4 includes a forming bottom surface 5. An installation through hole 6 and a perforation 7 penetrate through the forming bottom surface 5 up and down. A lower punching forming rod 8 is provided on the forming lower punch 3. The forming lower punch 3 is fitted in the installation through hole 6. The corresponding lower punching forming rod 8 is arranged in the perforation 7, and the end surface of the lower punching forming rod 8 protrudes from the forming bottom surface 5. A circular groove 9 corresponding to the lower punching forming rod 8 is provided on the lower end surface of the forming upper punch 1. The circular groove 9 is used for forming a boss 11.

[0018] In the present utility model, by providing the lower punching forming rod 8, the end surface of the lower punching forming rod 8 protrudes from the forming bottom surface 5, thus forming a false punch. When powder is formed, under the action of the lower punching forming rod 8, the powder at the lower part of the boss 11 is pushed to the upper part of the boss 11, thereby improving the density of the boss 11 and meeting the use strength requirements of customers. In addition, there is no need to purchase an external shaft for installation, which reduces costs and at the same time reduces the technological process, greatly improving the production efficiency.

[0019] See Figure 1 、 Figure 2 shown, a first circular hole 21 for installing the lower punching forming rod 8 is provided on the forming lower punch 3. A first limiting circular groove 22 is provided at the lower end of the first circular hole 21. A first mandrel base 23 is provided at the lower end of the lower punching forming rod 8. The lower punching forming rod 8 is arranged in the first circular hole 21, and the first mandrel base 23 is arranged in the first limiting circular groove 22. A lower punching plate 24 is provided at the bottom end of the forming lower punch 3. During installation, the lower punching forming rod 8 is inserted into the first limiting circular groove 22 and the first circular hole 21 from the bottom upwards. The end surface of the lower punching forming rod 8 protrudes from the first circular hole 21 and the forming bottom surface 5. The first limiting circular groove 22 is used for limiting the first mandrel base 23. Finally, the lower punching plate 24 is fixed by bolts to realize the fixed installation of the lower punching forming rod 8.

[0020] Further, one or more first gaskets 31 are provided between the first limiting circular groove 22 and the first mandrel base 23. The first gaskets 31 are sleeved on the lower punching forming rod 8, so that according to the production situation, the number of the first gaskets 31 can be increased or decreased, thereby adjusting the height of the lower punching forming rod 8 protruding from the forming bottom surface 5.

[0021] When adjusting the number of the first gaskets 31, the lower punching plate 24 also needs to be adjusted appropriately. Corresponding grooves are dug or the lower punching plate 24 is padded to ensure that the first mandrel base 23 is tightly fixed.

[0022] See Figure 1 、 Figure 2 As shown, a second round hole 41 is provided on the forming upper punch 1, and an upper punch forming rod 42 is arranged in the second round hole 41. The upper punch forming rod 42 penetrates into the second round hole 41 from top to bottom, and the lower end surface of the upper punch forming rod 42 does not penetrate the lower end surface of the forming upper punch 1, so that a circular groove 9 is formed between the lower end surface of the upper punch forming rod 42 and the inner wall of the second round hole 41.

[0023] Further, a second limiting groove 51 is provided at the upper end of the second round hole 41, and a second mandrel base 52 is provided at the upper end of the upper punch forming rod 42. The second mandrel base 52 is arranged in the second limiting groove 51. One or more second gaskets 53 are further arranged between the second mandrel base 52 and the second limiting groove 51. The second gaskets 53 are sleeved on the upper punch forming rod 42, and an upper punch pressing plate 54 is arranged at the upper end of the forming upper punch 1. Thus, according to the production situation, the number of the second gaskets 53 can be increased or decreased, the depth of the circular groove 9 can be adjusted, so as to adjust the height of the boss 11 of the powder metallurgy product. When the number of the second gaskets 53 is adjusted, the upper punch pressing plate 54 also needs to be adjusted appropriately, and corresponding grooving or padding is carried out on the upper punch pressing plate 54, so as to ensure that the second mandrel base 52 is tightly fixed.

[0024] In the present utility model, the materials of the lower punch forming rod 8 and the upper punch forming rod 42 are both tungsten carbide, and tungsten carbide has the characteristics of high hardness, high melting point, high wear resistance and high corrosion resistance.

[0025] Further, the material of the forming middle die 2 is SKH9 steel, which is relatively balanced in terms of wear resistance and toughness. Especially because only the carbon content is increased or decreased, the high-temperature characteristics are not damaged, the steel properties can be continuously and greatly changed, it is rich in hot working and cold working plasticity, and the machinability and grindability are also good.

[0026] Further, the forming upper punch 1 and the forming lower punch 3 are high-performance cold work tool steels.

[0027] Combined with the drawings and the above display and description of the basic principles, main features and advantages of the present utility model, those skilled in the art should understand that the present utility model is not limited by the above embodiments. The above embodiments and the description in the specification only illustrate the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A powder metallurgy die with a false punch structure, comprising a forming upper punch (1), a forming middle die (2) and a forming lower punch (3), characterized in that: The upper end surface of the molding middle die (2) is provided with a molding cavity (4), and the molding cavity (4) includes a molding bottom surface (5). The molding bottom surface (5) is provided with a mounting through hole (6) and a through hole (7) extending therethrough from top to bottom. A lower punch molding rod (8) is provided on the molding lower punch (3). The molding lower punch (3) is cooperatively arranged in the mounting through hole (6), and the corresponding lower punch molding rod (8) is arranged in the through hole (7), and the end surface of the lower punch molding rod (8) protrudes from the molding bottom surface (5). The lower end surface of the molding upper punch (1) is provided with a circular groove (9) corresponding to the lower punch molding rod (8).

2. The powder metallurgy mold with a false punch structure according to claim 1, characterized in that: A first circular hole (21) for mounting the lower punch forming rod (8) is provided on the forming lower punch (3), a first limiting circular groove (22) is provided at the lower end of the first circular hole (21), a first core rod base (23) is provided at the lower end of the lower punch forming rod (8), the lower punch forming rod (8) is arranged in the first circular hole (21), the first core rod base (23) is arranged in the first limiting circular groove (22), and a lower punching plate (24) is provided at the bottom end of the forming lower punch (3).

3. The powder metallurgy mold with a false punch structure according to claim 2, characterized in that: One or more first gaskets (31) are arranged between the first limiting circular groove (22) and the first core rod base (23), and the first gaskets (31) are sleeved on the lower punch forming rod (8).

4. The powder metallurgy mold with a false punch structure according to claim 1, characterized in that: A second circular hole (41) is provided on the forming upper punch (1), and an upper punch forming rod (42) is provided in the second circular hole (41). The upper punch forming rod (42) penetrates into the second circular hole (41) from top to bottom, and the lower end surface of the upper punch forming rod (42) does not pass through the lower end surface of the forming upper punch (1), so that the lower end surface of the upper punch forming rod (42) and the inner wall of the second circular hole (41) form a circular groove (9).

5. The powder metallurgy mold with a false punch structure according to claim 4, characterized in that: A second limiting groove (51) is arranged at the upper end of the second circular hole (41), a second core rod base (52) is arranged at the upper end of the upper punch forming rod (42), the second core rod base (52) is arranged in the second limiting groove (51), one or more second gaskets (53) are arranged between the second core rod base (52) and the second limiting groove (51), the second gasket (53) is sleeved on the upper punch forming rod (42), and an upper punching plate (54) is arranged at the upper end of the forming upper punch (1).

6. The powder metallurgy mold with a false punch structure according to claim 1, characterized in that: The material of the lower punch forming rod (8) is tungsten carbide.

7. The powder metallurgy mold with a false punch structure according to claim 5, characterized in that: The upper punch forming rod (42) is made of tungsten carbide.

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