Shaping and positioning structure of powder metallurgy special-shaped part

Abstract

The utility model provides a shaping and positioning structure of a powder metallurgy special-shaped part, which comprises a shaping female die capable of placing the special-shaped part, a guide plate is arranged on the shaping female die, the guide plate is of a step type structure, a first special-shaped hole is formed in the center of the guide plate, and the first special-shaped hole is matched with the special-shaped part in appearance. A plurality of evenly-distributed connecting holes are formed in the outer ring of the first special-shaped hole, a plurality of evenly-distributed screw holes are formed in the circumference of the shaping female die, the connecting holes and the screw holes are arranged in a one-to-one correspondence mode, bolts are arranged in the screw holes, and the guide plate and the shaping female die are connected into a whole through the bolts. According to the utility model, the guide plate is additionally arranged above the shaping female die, so that the problems of shaping and positioning of the special-shaped structure product are solved, an operator can place the special-shaped structure product conveniently, and the operability is improved; the guide plate is of a stepped structure, the height of the female die can be reduced after the guide plate is added, friction between parts and the die wall is avoided in the shaping process, the guide plate is made of Cr12MoV, the cost is greatly reduced, and the effect of reducing the cost is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of powder metallurgy shaping dies, and particularly relates to a shaping and positioning structure for powder metallurgy special-shaped parts. Background Art

[0002] As a high-tech industry, powder metallurgy combines material science and metal forming technology perfectly and is widely used in the field of automotive parts to give play to its characteristics of high efficiency, material saving and energy saving. With the rapid development of the automotive industry, higher requirements are also put forward for the accuracy and performance of parts. Therefore, in order to correct the deformation after sintering, a shaping process is used, that is, by applying additional pressure to the parts to make them reach the required size and accuracy.

[0003] Generally, a full-circumference guiding section is arranged at the mold inlet of the general powder metallurgy shaping female die, which is enlarged by 0.2 - 0.25 mm on one side according to the part shape, and the arc at the interface is smoothly connected. During shaping, the product is manually placed on the guiding section of the shaping female die, and the part stays stably at the mold inlet. Then the press is started, and the part is pressed into the cavity of the female die by the shaping upper die, so that the part is plastically deformed under extrusion in the cavity to correct its size and accuracy. When the part involved is a special-shaped part, such as Figure 1 、 Figure 2 As shown, the upper part of the special-shaped part is a cylindrical structure 1 with a height of 13 mm. A first through hole 2 and a second through hole 3 are arranged on the cylindrical structure 1, and the lower part is a special-shaped structure 4 with a height of 5 mm. The two are connected by a special-shaped rib 5. There are the following technical defects: when the part is a special-shaped part and the step difference between each step is large, during manual placement, the cylindrical structure 1 enters the female die first, and the special-shaped structure 4 does not enter the female die, resulting in positioning deviation, and there is a risk that the part will tilt to one side and cannot be stably placed at the mold inlet of the female die.

[0004] Therefore, how to design a shaping and positioning structure for powder metallurgy special-shaped parts has become an urgent problem to be solved. Content of the Utility Model

[0005] Aiming at the problems existing in the prior art, the utility model provides a shaping and positioning structure for powder metallurgy special-shaped parts to solve at least one of the above technical problems.

[0006] The technical solution of the utility model is: a shaping and positioning structure for powder metallurgy special-shaped parts, including a shaping female die capable of placing special-shaped parts. An special-shaped rib is arranged in the middle of the special-shaped part. A guiding plate is arranged on the shaping female die. The guiding plate is of a stepped structure. A first special-shaped hole is arranged at the center of the guiding plate. The first special-shaped hole matches the shape of the special-shaped part. Several uniformly distributed connecting holes are arranged on the outer circle of the first special-shaped hole. Several uniformly distributed screw holes are arranged on the circumference of the shaping female die. The connecting holes and the screw holes are arranged in one-to-one correspondence. Bolts are arranged in the screw holes, and the bolts connect the guiding plate and the shaping female die into a whole.

[0007] The utility model solves the problem of shaping and positioning of products with special-shaped structures by adding a guide plate above the shaping female mold, which is convenient for operators to place and improves the operability. The guide plate is of a stepped structure. After adding the guide plate, the height of the female mold can be reduced. The guide plate and the shaping female mold are installed and fixed by bolts. Since this template is only used for product shaping guidance, the parts will not rub against the mold wall during the shaping process. The material of the female mold is cemented carbide, which is expensive, while the material of the guide plate is Cr12MoV, and the cost is greatly reduced, achieving the effect of cost reduction. At the same time, there is no guiding section at the mold inlet of the shaping female mold, shortening the height. At the initial stage of shaping, due to the 8-mm drop on both sides of the guide plate, it is ensured that the cylindrical part and the special-shaped part of the part can enter the guiding section simultaneously, playing a role in precise positioning. The part stays stably at the mold inlet of the female mold. At this time, the press is started, and the shaping upper mold presses the part into the cavity of the female mold, so that the part is extruded in the cavity to produce plastic deformation to correct its size and accuracy. Description of the Drawings

[0008] Figure 1 It is the front view of the special-shaped part of the prior art.

[0009] Figure 2 It is the left view of the special-shaped part of the prior art.

[0010] Figure 3 It is the front view of the guide plate of the utility model.

[0011] Figure 4 It is Figure 3 the A-A sectional view of

[0012] Figure 5 It is the front view of the shaping female mold of the utility model.

[0013] Figure 6 It is Figure 5 the B-B sectional view of

[0014] In the figure: 1. Cylindrical structure; 2. First through hole; 3. Second through hole; 4. Special-shaped structure; 5. Special-shaped rib; 6. Guide plate; 7. Shaping female mold; 601. Step hole; 602. Third through hole; 603. First pin hole; 604. First arc segment; 605. Second arc segment; 701. Threaded hole; 702. Second pin hole; 703. Convex rib. Detailed Embodiment

[0015] The following further describes the utility model with reference to the drawings.

[0016] Refer to Figures 1-6, the structures, proportions, sizes, etc. shown in the drawings of this specification are only used to match the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the conditions for the implementation of the present utility model. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the efficacy that the present utility model can generate and the purpose that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear narration and are not used to limit the scope of implementation of the present utility model. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope of implementation of the present utility model.

[0017] Example 1. A shaping and positioning structure for a powder metallurgy special-shaped part, referring to Figure 3 , Figure 5 , including a shaping female die 7 capable of placing special-shaped parts. There is a special-shaped rib 5 in the middle of the special-shaped part. A guide plate 6 is arranged on the shaping female die 7. The guide plate 6 is a stepped structure. The thickness of the large end of the stepped structure is 17 mm, and the thickness of the small end of the stepped structure is 9 mm. A first special-shaped hole is arranged at the center of the guide plate 6, and the first special-shaped hole matches the outer shape of the special-shaped part. Six evenly distributed connecting holes are arranged on the outer circle of the first special-shaped hole. Several evenly distributed screw holes 701 are arranged on the circumference of the shaping female die 7. The connecting holes and the screw holes 701 are arranged in one-to-one correspondence. Bolts are arranged in the screw holes 701, and the bolts connect the guide plate 6 and the shaping female die 7 into a whole. The present utility model solves the problem of shaping and positioning of products with special-shaped structures by adding a guide plate above the shaping female die, which is convenient for operators to place and improves the operability; the guide plate is a stepped structure. After adding the guide plate, the height of the female die can be reduced. The guide plate and the shaping female die are installed and fixed by bolts. Since this template is only used for product shaping guidance, the parts will not rub against the die wall during the shaping process. The material of the female die is cemented carbide, which is expensive, while the material of the guide plate is Cr12MoV, and the cost is greatly reduced, achieving the effect of cost reduction. At the same time, there is no guiding section at the die inlet of the shaping female die, shortening the height; at the initial stage of shaping, due to the 8-mm drop on both sides of the guide plate, it is ensured that the cylindrical part and the special-shaped part of the part can enter the guiding section at the same time, playing a role of accurate positioning. The part stays stably at the die inlet of the female die. At this time, the press is started, and the shaping upper die presses the part into the die cavity of the female die, so that the part is extruded in the die cavity to generate plastic deformation to correct its size and accuracy.

[0018] Example 2. On the basis of Example 1, referring to Figure 4, the connecting holes include three stepped holes 601 and three third through holes 602. The three stepped holes 601 are arranged adjacent to each other and are located at the large end of the stepped structure. The three third through holes 602 are arranged adjacent to each other and are located at the small end of the stepped structure. The guiding plate of the present utility model adopts a stepped structure. The three stepped holes are located at the large end of the stepped structure, and the three third through holes are located at the small end of the stepped structure.

[0019] Embodiment 3: On the basis of Embodiment 2, referring to Figure 5 , symmetrically arranged first pin holes 603 are further provided on the circumference of the guiding plate 6. One of the first pin holes 603 is located between adjacent stepped holes 601, and the other first pin hole 603 is located between adjacent third through holes 602. Symmetrically arranged second pin holes 702 are provided on the circumference of the sizing female die 7. The first pin holes 603 and the second pin holes 702 are made by matching. The sizes of both the first pin holes 603 and the second pin holes 702 are φ8. The present utility model adopts the method of providing first pin holes on the guiding plate and making second pin holes by matching on the sizing female die. After the positions of the guiding plate and the sizing female die are calibrated through the two pin holes, they are installed and fixed with six bolts, ensuring the stable and precise connection between the guiding plate and the sizing female die.

[0020] Embodiment 4: On the basis of Embodiment 1, the first special-shaped hole of the guiding plate 6 is a T-shaped structure. A first arc segment 604 is provided at the web end of the T-shaped structure. The first arc segment 604 is located at the small end of the stepped structure, and the radial dimension of the first arc segment 604 is 0.08 mm larger than the radial dimension of the corresponding part of the special-shaped part. The present utility model adopts the method that the radial dimension of the first arc segment is 0.08 mm larger than the radial dimension of the corresponding part of the special-shaped part, which can facilitate the insertion of the large end of the special-shaped part into the guiding plate.

[0021] Embodiment 5: On the basis of Embodiment 1, a second arc segment 605 is provided at the flange end of the T-shaped structure. The second arc segment 605 is located at the large end of the stepped structure, and the radial dimension of the second arc segment 605 is 0.1 mm larger than the radial dimension of the corresponding part of the special-shaped part. The present utility model adopts the method that the radial dimension of the second arc segment is 0.1 mm larger than the radial dimension of the corresponding part of the special-shaped part, which can facilitate the insertion of the small end of the special-shaped part into the guiding plate.

[0022] Embodiment 6: On the basis of Embodiment 5, except for the second arc segment 605 at the flange end of the T-shaped structure, the other parts are 0.2 mm larger than the corresponding parts of the special-shaped part.

[0023] Embodiment 7: On the basis of Embodiment 1, referring to Figure 6, a second special-shaped hole is provided in the middle of the shaping female mold 7. The second special-shaped hole matches the outer shape of the special-shaped part. A convex rib 703 is provided in the second special-shaped hole, and the cross-section of the convex rib 703 matches the special-shaped rib 5. The utility model adopts a convex rib matching the special-shaped rib, which can support the special-shaped part placed on the guide plate.

[0024] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. A shaping and positioning structure for powder metallurgy shaped parts, comprising a shaping female mold (7) capable of placing the shaped parts, wherein a shaped rib (5) is arranged in the middle of the shaped parts, and characterized in that: The shaping female mold (7) is provided with a guide plate (6), the guide plate (6) is a stepped structure, a first special-shaped hole is provided at the center of the guide plate (6), the first special-shaped hole matches the shape of the special-shaped part, a plurality of evenly distributed connecting holes are provided on the outer circle of the first special-shaped hole, a plurality of evenly distributed screw holes (701) are provided on the circumference of the shaping female mold (7), the connecting holes are arranged one-to-one with the screw holes (701), bolts are provided in the screw holes (701), and the bolts connect the guide plate (6) and the shaping female mold (7) as a whole.

2. The shaping and positioning structure of a powder metallurgy special-shaped part according to claim 1, characterized in that: The connection holes include three stepped holes (601) and three third through holes (602); the three stepped holes (601) are arranged adjacent to each other, and the three stepped holes (601) are located at the large end of the stepped structure; the three third through holes (602) are arranged adjacent to each other, and the three third through holes (602) are located at the small end of the stepped structure.

3. The shaping and positioning structure of a powder metallurgy special-shaped part according to claim 2, characterized in that: The guide plate (6) is also provided with symmetrically arranged first pin holes (603) on its circumference, and the shaping female mold (7) is provided with symmetrically arranged second pin holes (702) on its circumference, forming the first pin holes (603) and the second pin holes (702).

4. The shaping and positioning structure of a powder metallurgy special-shaped part according to claim 1, characterized in that: The first special-shaped hole of the guide plate (6) is a T-shaped structure, and a first arc segment (604) is provided at the web end of the T-shaped structure. The first arc segment (604) is located at the small end of the stepped structure, and the radial dimension of the first arc segment (604) is 0.08 mm greater than the radial dimension of the corresponding part of the special-shaped part; The flange end of the T-shaped structure is provided with a second arc segment (605), the second arc segment (605) is located at the large end of the step-type structure, and the radial dimension of the second arc segment (605) is 0.1 mm larger than the radial dimension of the corresponding part of the special-shaped part.

5. The shaping and positioning structure of a powder metallurgy special-shaped part according to claim 4, characterized in that: Except for the second arc segment (605), the other parts of the flange end of the T-shaped structure are 0.2 mm larger than the corresponding parts of the special-shaped parts.

6. The shaping and positioning structure of a powder metallurgy special-shaped part according to claim 1, characterized in that: A second special-shaped hole is arranged in the middle of the shaping female mold (7), the second special-shaped hole matches the shape of the special-shaped part, and a convex rib (703) is arranged in the second special-shaped hole, the cross section of the convex rib (703) matches the special-shaped rib (5).

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