Powder metallurgy forming die for combined gear

Abstract

A powder metallurgy forming die for a combination gear belongs to the field of die manufacturing and comprises a forming female die, an upper forming punch, a lower forming punch and a forming core rod, and a first cylindrical groove, a first tooth-shaped groove, a second cylindrical groove and a second tooth-shaped groove which are used for forming an outer contour structure of the combination gear are formed in an inner cavity of the forming female die. A second tooth-shaped ridge set matched with the second tooth-shaped groove is arranged on the outer side of a punch head of the upper forming punch, a third groove with the longitudinal section in the shape of a Chinese character'tu 'is formed in the top end of the punch head of the upper forming punch, and a first tooth-shaped ridge set matched with the first tooth-shaped groove is arranged on the outer side of a punch head of the lower forming punch. And a through hole matched with the outer contour of the forming core rod is formed in the central axis of the forming upper punch and the forming lower punch. And by reasonably designing the structures of all the parts, large-batch and high-precision manufacturing of the combined gear is achieved through the general powder metallurgy technology, and the labor cost and the mold cost are reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of die manufacturing, and particularly relates to a powder metallurgy forming die of a combined gear. BACKGROUND

[0002] Mold, industrial production adopts injection molding, blow molding, extrusion, die casting or forging, smelting, stamping, stretching and other methods to form the required products when using various molds and tools. Powder metallurgy is an industrial technology that uses metal powder or a mixture of metal powder and non-metal powder as raw material, and through forming and sintering, metal materials, composite materials and various types of products are obtained. Powder metallurgy technology has a series of advantages such as significant energy saving, material saving, excellent performance, high product precision and good stability, and is very suitable for mass production. When using powder metallurgy technology to form products, the design of the mold is crucial.

[0003] For the combined gear, the powder metallurgy technology can be used to manufacture, reduce the process, improve the efficiency, and reduce the labor intensity of the production personnel. SUMMARY

[0004] The utility model solves the technical problem to provide a metallurgical forming die of a combined gear, through reasonable design of the structure of each part, the mass production and high precision manufacturing of the combined gear are realized by using the general powder metallurgy technology, and the labor cost and the mold cost are reduced.

[0005] The utility model adopts the technical scheme: a powder metallurgy forming die of a combined gear, including forming female die, forming upper punch, forming lower punch and forming core rod, first cylindrical groove, first tooth-shaped groove, second cylindrical groove and second tooth-shaped groove for forming the outer contour structure of the combined gear are arranged in the inner cavity of the forming female die, the outer side of the punch head of the forming upper punch is equipped with the second tooth-shaped rib group matched with the second tooth-shaped groove, the top end of the punch head of the forming upper punch is equipped with the third groove with the longitudinal section being "convex", the outer side of the punch head of the forming lower punch is equipped with the first tooth-shaped rib group matched with the first tooth-shaped groove, the central shafts of the forming upper punch and the forming lower punch are equipped with the through hole matched with the outer contour of the forming core rod.

[0006] Further, the outer contour diameter of the second tooth-shaped groove is greater than the outer contour diameter of the first tooth-shaped groove.

[0007] Further, the shape of the forming core rod is composed of a cylindrical body in a stepped stack.

[0008] Further, the single-sided gap between the forming female die and the forming upper punch is 0.01-0.015mm, and the single-sided gap between the forming female die and the forming lower punch is 0.01-0.015mm.

[0009] Further, the single-side gap between the forming core rod and the forming lower punch is 0.01-0.015mm, and the single-side gap between the forming core rod and the forming upper punch is 0.01-0.015mm.

[0010] The utility model discloses the beneficial effect that produces: through the reasonable design of the structure of each component, the mass, high accuracy manufacturing of combination gear is realized to general powder metallurgy technology, reduces artificial cost and mould cost. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is the structure diagram of forming female die;

[0012] Figure 2 It is the structure diagram of forming upper punch;

[0013] Figure 3 It is the structure diagram of forming lower punch;

[0014] Figure 4 It is the structure diagram of forming core rod;

[0015] Figure 5 It is the three-dimensional view of combination gear produced by the utility model;

[0016] In the drawings: 1-1 is first cylindrical groove, 1-2 is toothed groove, 1-3 is second cylindrical groove, 3-1 is toothed ridge. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantage of the utility model embodiment more clear, the technical scheme in the utility model embodiment will be clearly and completely described below in conjunction with the drawings in the utility model embodiment.

[0018] Referring to the drawings Figures 1-5 A powder metallurgy forming die of combination gear, comprising forming female die, forming upper punch, forming lower punch and forming core rod, first cylindrical groove 1-1, first toothed groove 1-2, second cylindrical groove 1-3 and second toothed groove 1-4 for forming the outer contour structure of combination gear are arranged in the inner cavity of the forming female die, the punch outer side of the forming upper punch is provided with second toothed ridge 2-1 group matched with the second toothed groove 1-4, the punch top end of the forming upper punch is provided with third groove 2-2 with "convex" shape in longitudinal section, the punch outer side of the forming lower punch is provided with first toothed ridge 3-1 group matched with the first toothed groove 1-2, the central shafts of the forming upper punch and the forming lower punch are provided with through holes matched with the outer contour of the forming core rod. The outer contour diameter of the second toothed groove 1-4 is greater than the outer contour diameter of the first toothed groove 1-2. The shape of the forming core rod is composed of cylindrical body in ladder stack.

[0019] To ensure the precision of the combined gear after forming, the single-side gap between the forming female die and the forming upper punch is 0.01-0.015mm, the single-side gap between the forming female die and the forming lower punch is 0.01-0.015mm, the single-side gap between the forming core rod and the forming lower punch is 0.01-0.015mm, and the single-side gap between the forming core rod and the forming upper punch is 0.01-0.015mm.

[0020] In the specific use of the mold, each component in the device is matched with a lifting driving device according to the need. First, the forming female die and the forming lower punch form a forming cavity in cooperation, then the powder is filled into the forming cavity, the forming core rod rises, the forming upper punch descends, and the combined gear is obtained by stamping. After the stamping is completed, the forming upper punch rises, the forming lower punch and the forming core rod respectively descend, and the formed workpiece is taken out, and the demolding is completed.

[0021] The combined gear blank formed by the stamping is subjected to the processes of sintering and heat treatment to meet the design requirements of the combined gear, and finally forms the combined gear as shown in FIG. 5.

[0022] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the utility model and not to limit them; although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the specific embodiments of the utility model can still be modified or some technical features can be replaced by equivalents; without departing from the spirit of the technical solutions of the utility model, they should be covered in the technical solution range of the utility model claimed.

Claims

1. A powder metallurgical forming die for a combination gear, comprising a forming cavity, a forming upper punch, a forming lower punch and a forming core pin, characterized in that: The first cylindrical groove (1-1), the first tooth-shaped groove (1-2), the second cylindrical groove (1-3) and the second tooth-shaped groove (1-4) are arranged in the inner cavity of the forming female die for forming the combined gear outer contour structure, the outer side of the punch of the forming upper punch is provided with a second tooth-shaped ridge (2-1) group matched with the second tooth-shaped groove (1-4), the top end of the punch of the forming upper punch is provided with a third groove (2-2) with a longitudinal section in the shape of "convex", the outer side of the punch of the forming lower punch is provided with a first tooth-shaped ridge (3-1) group matched with the first tooth-shaped groove (1-2), and the center shafts of the forming upper punch and the forming lower punch are provided with through holes matched with the outer contour of the forming mandrel.

2. The powder metallurgy forming die for a combination gear according to claim 1, characterized by: The outer contour diameter of the second tooth-shaped groove (1-4) is greater than that of the first tooth-shaped groove (1-2).

3. The powder metallurgy forming die for a combination gear according to claim 1, characterized by: The shape of the forming mandrel is composed of a cylindrical body in a stepped stack.

4. The powder metallurgy forming die for a combination gear according to claim 1, characterized by: The single-side gap between the forming female die and the forming upper punch is 0.01-0.015 mm, and the single-side gap between the forming female die and the forming lower punch is 0.01-0.015 mm.

5. The powder metallurgy forming die for a combination gear according to claim 1, characterized by: The single-side gap between the forming mandrel and the forming lower punch is 0.01-0.015 mm, and the single-side gap between the forming mandrel and the forming upper punch is 0.01-0.015 mm.

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