Powder metallurgy forming die for driven gear

Abstract

A powder metallurgy forming die of a driven 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 groove, a tooth-shaped groove and a second groove which are used for forming an outer contour structure of the driven gear are formed in an inner cavity of the forming female die. The outer contour of the cross section of a punch of the upper forming punch is round, the cross section of an inner hole is in a regular hexagon shape, a third groove is formed in the top of the punch of the upper forming punch, a tooth-shaped ridge set matched with the tooth-shaped groove is arranged on the outer side of a punch of the lower forming punch, and the outer contour of the cross section of a punch of the forming core rod is in a regular hexagon shape. By reasonably designing the structures of all the parts, large-batch and high-precision manufacturing of the driven gear is achieved through the general powder metallurgy technology, and the labor cost and the mold cost are reduced.

Description

Technical Field

[0001] This utility model belongs to the field of mold manufacturing, specifically relating to a powder metallurgy forming mold for a passive gear. Background Technology

[0002] Molds are various dies and tools used in industrial production to shape products using methods such as injection molding, blow molding, extrusion, die casting, forging, smelting, stamping, and stretching. Powder metallurgy is an industrial technology that produces metal materials, composite materials, and various types of products by taking metal powders or using metal powders (or mixtures of metal and non-metal powders) as raw materials, and then molding and sintering them. Powder metallurgy technology has a series of advantages such as significant energy saving, material saving, excellent performance, high product precision, and good stability, making it very suitable for mass production. When using powder metallurgy technology to shape products, the design of the mold is crucial.

[0003] For driven gears, manufacturing can be achieved through powder metallurgy technology, which reduces processes, improves efficiency, and reduces the labor intensity of production personnel. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a metallurgical forming mold for a passive gear. By rationally designing the structure of each component, the passive gear can be manufactured in large quantities and with high precision using general powder metallurgy technology, thereby reducing labor costs and mold costs.

[0005] The technical solution adopted by this utility model is: a powder metallurgy forming mold for a passive gear, including a forming female mold, a forming upper punch, a forming lower punch, and a forming mandrel. The inner cavity of the forming female mold is provided with a first groove, a tooth-shaped groove, and a second groove for forming the outer contour structure of the passive gear. The outer contour of the punch of the forming upper punch is circular, and the inner cross-section is regular hexagonal. The top of the punch of the forming upper punch is provided with a third groove. The outer side of the punch of the forming lower punch is provided with a tooth-shaped rib group that cooperates with the tooth-shaped groove. The outer contour of the punch of the forming mandrel is regular hexagonal.

[0006] Furthermore, the cross-sectional shape of the inner hole of the forming punch is a regular hexagon that matches the forming mandrel punch.

[0007] Furthermore, the top of the toothed rib assembly is lower than the top of the forming punch.

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

[0009] Furthermore, the single-sided gap between the forming female mold and the forming lower punch is 0.01-0.015mm, and the single-sided gap between the forming lower punch and the forming mandrel is 0.01-0.015mm.

[0010] The beneficial effects of this utility model are as follows: by rationally designing the structure of each component, the general powder metallurgy technology enables the mass production and high precision manufacturing of passive gears, reducing labor costs and mold costs. Attached Figure Description

[0011] Figure 1 This is a structural diagram of the molding female mold;

[0012] Figure 2 This is a structural diagram of the forming upper punch;

[0013] Figure 3 This is a structural diagram of the forming punch;

[0014] Figure 4 This is a structural diagram of the mandrel;

[0015] Figure 5 This is a perspective view of the present invention;

[0016] In the attached diagram: 1-1 is the first groove, 1-2 is the toothed groove, 1-3 is the second groove, 2-1 is the third groove, and 3-1 is the toothed ridge. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0018] See appendix Figure 1-5 A powder metallurgical forming mold for a passive gear includes a forming female mold, a forming upper punch, a forming lower punch, and a forming mandrel. The inner cavity of the forming female mold has a first groove 1-1, a tooth-shaped groove 1-2, and a second groove for forming the outer contour structure of the passive gear. The outer contour of the forming upper punch's cross-section is circular, and the inner cross-section is hexagonal. The top of the forming upper punch has a third groove 2-1. The outer side of the forming lower punch has a set of tooth-shaped ribs 3-1 that mate with the tooth-shaped grooves 1-2. The outer contour of the forming mandrel's punch cross-section is hexagonal. The top of the set of tooth-shaped ribs 3-1 is lower than the top of the forming lower punch. The inner cross-section of the forming lower punch is hexagonal, mates with the forming mandrel punch.

[0019] To ensure the accuracy of the driven gear after molding, the single-sided gap between the molding female die and the molding upper punch is 0.01-0.015mm. The single-sided gap between the molding female die and the molding lower punch is 0.01-0.015mm, and the single-sided gap between the molding lower punch and the molding mandrel is 0.01-0.015mm.

[0020] In practical use, the mold of this utility model is equipped with lifting drive devices for each component as needed. First, the forming female mold and the forming lower punch cooperate to form a cavity. Then, powder is filled into the cavity, the forming lower mandrel rises, and the forming upper punch descends, pressing against each other to form a driven gear. After pressing, the forming lower punch and forming mandrel descend respectively, and the forming upper punch rises to remove the formed workpiece, thus completing the demolding process.

[0021] The pressed passive gear blank undergoes sintering, heat treatment, and other processes to meet the design requirements of the passive gear, ultimately forming a passive gear as shown in Figure 5.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A powder metallurgical forming die for a passive gear wheel comprising a forming cavity, a forming upper punch, a forming lower punch and a forming core rod, characterized in that: The first groove (1-1) for forming the outer contour structure of the passive gear, the tooth-shaped groove (1-2) and the second groove (1-3) are arranged in the inner cavity of the forming female die, the cross section of the punch of the forming upper punch is circular and the inner hole is hexagonal, the third groove (2-1) is arranged on the top of the punch of the forming upper punch, the tooth-shaped ridge (3-1) groups are arranged on the outer side of the punch of the forming lower punch and matched with the tooth-shaped groove (1-2), and the cross section of the punch of the forming core rod is hexagonal.

2. The powder metallurgy forming die for a passive gear according to claim 1, characterized in that: The inner hole of the forming lower punch is hexagonal.

3. The powder metallurgy forming die for a passive gear of claim 1, wherein: The top of the tooth-shaped ridge (3-1) groups is lower than the top of the punch of the forming lower punch.

4. The powder metallurgy forming die for a passive gear of claim 1, wherein: The single-side gap between the forming female die and the forming upper punch is 0.01-0.015 mm.

5. The powder metallurgy forming die for a passive gear of claim 1, wherein: The single-side gap between the forming female die and the forming lower punch is 0.01-0.015 mm, and the single-side gap between the forming lower punch and the forming core rod is 0.01-0.015 mm.

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