CN214888699U - Powder metallurgy signal wheel structure - Google Patents

Abstract

A powder metallurgy signal wheel structure is characterized in that the signal wheel is provided with a local convex area, opposite top surfaces of the local convex area of the signal wheel are designed into concave structures, and convex structures are arranged at positions of a stamping corresponding to the concave structures. The utility model has the advantages of reasonable design, it is effectual to take shape, improvement through the mold design, the density difference in each region of balanced product shaping blank, ensure that the circularity control after the sintering is in certain within range, make the circularity after the plastic satisfy the technical requirement within 0.035, finally ensure the size and the circularity in product processing aperture, in addition, when improving local density, can also reduce the pressure of shaping pressing equipment, the energy consumption of equipment has been reduced, the service life of mould has been improved, the rejection rate has been reduced, the stability and the reliability of production are improved, greatly reduced manufacturing cost.

Description

Powder metallurgy signal wheel structure

Technical Field

The utility model belongs to the technical field of powder metallurgy, concretely relates to powder metallurgy signal wheel structure.

Background

Powder metallurgy is a process technology for manufacturing metal materials, composites and various types of products by using metal or metal powder as a raw material through forming and sintering, is widely applied to various fields, has unique chemical composition and mechanical and physical properties, cannot be obtained by a traditional fusion casting method, and can be used for manufacturing various powder metallurgy parts such as automobiles, motorcycles, textile machinery, electric tools, hardware tools, electric appliances and the like.

The signal wheel belongs to the global project parts of the universal automobile company gear box, and is mainly produced by a famous powder metallurgy joint-fund factory in North America, Europe and China at present. Because the excircle diameter of the product with the structure is larger (> phi 150), the part has a special structure, a local convex and thin-wall structure and higher critical dimension precision (phi 130.13 +/-0.05). Because the product has a non-centrosymmetric structure with a special bulge shape on the local part, the local special structure can influence the density distribution of the product, further influence the conditions of the density uniformity, roundness, local strength and the like of the product, and finally influence the machining size result. At present, no powder metallurgy suppliers have the production capacity of the products at home.

Disclosure of Invention

The utility model aims to solve the technical problem that to foretell technical current situation and provide a powder metallurgy signal wheel structure that structural design is reasonable, density distribution is even, the shaping is effectual.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: a powder metallurgy signal wheel structure, the signal wheel having a localized raised area, characterized by: the opposite top surfaces of the local convex areas of the signal wheel are designed into concave structures;

the concave structure of the top surface of the local convex area pair is designed on the inner ring of the signal wheel, the concave structure is an upper section and a lower section, the width of the upper section is consistent with that of the local convex area, and the width of the lower section is larger than that of the local convex area.

Finally, the corners of the concave structures corresponding to the convex structures of the stamping are designed into R-angle smooth transition.

Compared with the prior art, the utility model has the advantages of: the opposite top surfaces of the local convex areas of the signal wheel are designed into concave structures, the positions of the stamping dies corresponding to the concave structures are provided with the convex structures, and the purpose of improving the product density is achieved by reducing the height of a compressed area, so that the product density is uniformly distributed; the corners of the protruding structures are designed into R-shaped corners for smooth transition, so that the roundness after sintering is effectively controlled, and the roundness after shaping is ensured. The utility model has the advantages of reasonable design, it is effectual to take shape, improvement through the mold design, the density difference in each region of balanced product shaping blank, ensure that the circularity control after the sintering is in certain within range, make the circularity after the plastic satisfy the technical requirement within 0.035, finally ensure the size and the circularity in product processing aperture, in addition, when improving local density, can also reduce the pressure of shaping pressing equipment, the energy consumption of equipment has been reduced, the service life of mould has been improved, the rejection rate has been reduced, the stability and the reliability of production are improved, greatly reduced manufacturing cost.

Drawings

FIG. 1 is a schematic diagram of a signal wheel fabricated with improved front mold tooling;

FIG. 2 is a cross-sectional view of the corresponding localized raised area of FIG. 1;

FIG. 3 is a schematic structural diagram of a signal wheel manufactured by the present invention;

FIG. 4 is a cross-sectional view of the corresponding localized elevated area of FIG. 3;

fig. 5 is a schematic structural view of another angle of the signal wheel manufactured by the present invention;

fig. 6 is a fragmented schematic view of a locally raised region.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

As shown in figures 3-6, the powder metallurgy signal wheel structure is characterized in that a signal wheel A is provided with a local convex area 1, the opposite top surfaces of the local convex area 1 of the signal wheel A are designed into concave structures 2, and convex structures are arranged at positions of punches corresponding to the concave structures 2, so that the compressed amount of the local convex area 1 is greatly increased under the condition that the total powder amount of the local area is not obviously reduced, and the purpose of improving the local density is achieved. The concave structure of the top surface of the local convex area 1 is designed on the inner ring of the signal wheel A, the concave structure 2 is an upper section and a lower section, the width of the upper section is consistent with that of the local convex area 1, and the width of the lower section is larger than that of the local convex area 1. The corner of the concave structure 2 corresponding to the convex structure of the punch is designed into an R-angle smooth transition 3 so as to buffer the iron powder overpressure and die damage risks caused by over-high local density.

Fig. 1 and 2 show a powder metallurgy signal wheel before modification, wherein the signal wheel B has a local convex region 10.

The utility model discloses an innovation thinking does:

1. the improved objects are a forming die and a signal wheel, and the local density of the product is improved by reducing the compressed amount of the convex-shaped area under the condition of ensuring sufficient loose powder loading;

2. the top surface of the local raised area is made into an inwards concave structure, so that the position of the local raised area corresponding to the stamping is a raised structure;

3. calculating the reduction amount of loose powder in the area when powder is filled due to local bulge of the stamping;

4. calculating the volume of the powder actually filled (after the reduction amount is removed) corresponding to the pressed volume according to the expected density to be achieved;

5. calculating the corresponding height according to the volume;

6. the iron powder overpressure and die damage risks caused by over-high local density are buffered, and the corners of the protruding areas corresponding to the stamping are designed into R-angle smooth transition.

The innovation points are as follows:

1. the purpose of improving the die is to ensure that a higher density is obtained after a special structure or a local raised area is formed and pressed, and the compressed amount of the raised area is greatly increased under the condition of not obviously reducing the total powder amount of the local area, so that the purpose of improving the local density is achieved.

2. The improvement of the local density is realized, the density can be stably controlled no matter in the process of powder filling, powder moving and pressing each time, the whole density is not required to be greatly increased to improve the local density, the pressure required by product pressing is reduced, and the density fluctuation caused by pressing each time is small and stable.

3. The method ensures that the difference value between the maximum value and the minimum value of the diameter of the sintered product is controlled within an acceptable range, ensures that the roundness of the product after shaping and pressing is controllable and stable, ensures good consistency of magnitude of interference in the shaping process due to great improvement of the roundness after sintering, ensures the uniformity of density, ensures that the resilience of each area after shaping and pressing is more stable, and ensures the roundness after shaping.

4. The roundness of the clamped outer diameter is small due to machining, the deformation is small after the clamping pressure is released, the roundness of the machined inner diameter size is good, the inner diameter size can be contained in a tolerance range, and the rejection rate is reduced.

FIG. 6 shows the required segment density for the design of the localized elevated regions 1, with the first segment 11 requiring a density of 7.1g/cm³The second stage 12 requires a density of 7.0g/cm³The third stage 13 requires a density of 6.5g/cm³。

Will the utility model discloses a local bulge area of the signal wheel of mould structure preparation carries out the density test to carry out the density comparison with the import piece, the result is shown as following table:

and (4) conclusion: the utility model discloses the density of the signal wheel of preparation accords with customer's segmentation density requirement, and product density distribution is more even than the import piece. The roundness after sintering is effectively controlled, and the roundness after shaping is ensured; and the fluctuation range is controlled, in the machining process, the rebound quantity of the outer diameter of the product after clamping, turning and pressure relief is obviously reduced, the roundness of the inner hole with the critical dimension is finally ensured, and the inner diameter dimension of the product is ensured to be contained in the tolerance range. In the key forming step, the die structure ensures that the product does not need to excessively improve the overall density to ensure the sectional density of the convex area, and the pressure of forming and pressing equipment can be reduced due to the reduction of the overall density, so that the energy consumption of the equipment is reduced, and the service life of the die is prolonged; in addition, the density uniformity also ensures the stability and reliability of the height difference and the parallelism of the product. The utility model discloses the mould structure has played obvious effect to product quality's improvement, the reduction of rejection rate, greatly reduced manufacturing cost.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims (2)

1. A powder metallurgy signal wheel structure, the signal wheel having a localized raised area, characterized by: the opposite top surfaces of the local convex areas of the signal wheel are designed into concave structures;

the concave structure of the top surface of the local convex area pair is designed on the inner ring of the signal wheel, the concave structure is an upper section and a lower section, the width of the upper section is consistent with that of the local convex area, and the width of the lower section is larger than that of the local convex area.

2. The powder metallurgy signal wheel structure of claim 1, wherein: the corners of the concave structures corresponding to the convex structures of the stamping are designed into R-angle smooth transition.

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