Powder metallurgy forming die for spiral gear

Abstract

A powder metallurgy forming die for a spiral gear belongs to the field of die manufacturing and comprises a forming middle die, an upper punch combination assembly, a lower punch combination assembly and a core rod combination assembly, and a cavity block for forming an outer contour structure of the spiral gear is nested in an inner cavity of the forming middle die; the upper punch assembly comprises an upper punch base, an upper punch press cover, an upper punch rotation auxiliary assembly and an upper punch arranged in the upper punch rotation auxiliary assembly which are sequentially connected from top to bottom; the lower punch combination assembly comprises a lower punch base, a lower punch press cover, a lower punch rotation auxiliary combination body and a lower punch arranged in the lower punch rotation auxiliary combination body which are sequentially connected from bottom to top. And the core rod combination assembly comprises a core rod base, a core rod gland, a core rod combination body and a core rod arranged in the core rod combination body which are sequentially connected from bottom to top. By reasonably designing the structures of all the parts, large-batch and high-precision manufacturing of the spiral 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 helical 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 uses metal powders (or mixtures of metal and non-metal powders) as raw materials, followed by molding and sintering, to produce metallic materials, composite materials, and various types of products. Powder metallurgy technology possesses a series of advantages, including significant energy savings, material savings, excellent performance, high product precision, and good stability, making it highly suitable for mass production. When using powder metallurgy technology to shape products, mold design is crucial.

[0003] For helical 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 powder metallurgy forming mold for helical gears. By rationally designing the structure of each component, the general powder metallurgy technology can realize the mass production and high precision manufacturing of helical gears, thereby reducing labor costs and mold costs.

[0005] The technical solution adopted by this utility model is as follows: a powder metallurgy forming mold for a helical gear, including a forming middle mold, an upper punch assembly, a lower punch assembly, and a mandrel assembly. A cavity block for forming the outer contour structure of the helical gear is nested in the inner cavity of the forming middle mold. The upper punch assembly includes an upper punch base, an upper punch cover, and an upper punch rotation auxiliary assembly connected from top to bottom, with an upper punch disposed within the upper punch rotation auxiliary assembly. The lower punch assembly includes a lower punch base, a lower punch cover, and a lower punch rotation auxiliary assembly connected from bottom to top, with a lower punch disposed within the lower punch rotation auxiliary assembly. The mandrel assembly includes a mandrel base, a mandrel cover, and a mandrel assembly connected from bottom to top, with a mandrel disposed within the mandrel assembly.

[0006] Furthermore, helical gears are provided on the outer sides of the upper and lower punches.

[0007] Furthermore, the upper punch rotation auxiliary assembly includes a first assembly upper cover, a first assembly body, and two bearings disposed vertically spaced within the first assembly body. The bottom of the upper punch is disposed between the two bearings, and a spring-loaded control mechanism is provided on the side of the first assembly body located between the two bearings.

[0008] Furthermore, the spring clamping control mechanism is a ball screw, and the side of the first assembly body is provided with a groove that mates with the ball screw.

[0009] Furthermore, the lower punch rotation auxiliary assembly includes a second assembly lower cover, a second assembly body, and two bearings disposed vertically spaced within the second assembly body, with the lower punch bottom disposed between the two bearings.

[0010] Furthermore, the mandrel assembly includes a lower cover of the third assembly, a body of the third assembly, and two bearings disposed at an interval between the upper and lower parts of the body of the third assembly, with the bottom of the mandrel disposed between the two bearings.

[0011] Furthermore, the single-sided gap between the forming die, the upper punch assembly, the lower punch assembly, and the mandrel assembly is 0.01-0.015mm.

[0012] 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 helical gears, reducing labor costs and mold costs. Attached Figure Description

[0013] Figure 1 This is a structural diagram of the molding die;

[0014] Figure 2 This is a structural diagram of the upper punch assembly;

[0015] Figure 3 This is a structural diagram of the upward-thrusting rotary auxiliary assembly;

[0016] Figure 4 This is a structural diagram of the lower punch assembly;

[0017] Figure 5 This is a structural diagram of the downward-thrusting rotary auxiliary assembly;

[0018] Figure 6 This is a structural diagram of the mandrel assembly;

[0019] Figure 7 This is a structural diagram of the mandrel assembly;

[0020] Figure 8 This is a structural diagram of a helical gear;

[0021] In the attached diagram: 1 is the forming die, 1-1 is the cavity block, 2-1 is the upper punch base, 2-2 is the upper punch cover, 2-3 is the upper punch rotation auxiliary assembly, 2-3-1 is the upper cover of the first assembly, 2-3-2 is the body of the first assembly, 2-3-3 is the groove, 2-4 is the upper punch, 3-1 is the lower punch base, 3-2 is the lower punch cover, 3-3 is the lower punch rotation auxiliary assembly, 3-3-1 is the lower cover of the second assembly, 3-3-2 is the body of the second assembly, 3-4 is the lower punch, 4-1 is the mandrel base, 4-2 is the mandrel cover, 4-3 is the mandrel assembly, 4-3-1 is the lower cover of the third assembly, 4-3-2 is the body of the third assembly, and 4-4 is the mandrel. Detailed Implementation

[0022] 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.

[0023] See appendix Figure 1-8 A powder metallurgical forming mold for a helical gear includes a forming die 1, an upper punch assembly, a lower punch assembly, and a mandrel assembly. A cavity block 1-1 for forming the outer contour structure of the helical gear is nested within the inner cavity of the forming die 1. The upper punch assembly includes an upper punch base 2-1, an upper punch cover 2-2, and an upper punch rotation auxiliary assembly 2-3 connected sequentially from top to bottom, with an upper punch 2-4 disposed within the upper punch rotation auxiliary assembly 2-3. The lower punch assembly includes a lower punch base 3-1, a lower punch cover 3-2, and a lower punch rotation auxiliary assembly 3-3 connected sequentially from bottom to top, with a lower punch 3-4 disposed within the lower punch rotation auxiliary assembly 3-3. The mandrel assembly includes a mandrel base 4-1, a mandrel cover 4-2, and a mandrel assembly 4-3 connected sequentially from bottom to top, with a mandrel 4-4 disposed within the mandrel assembly 4-3. Helical gears are provided on the outer sides of the upper punch 2-4 and the lower punch 3-4.

[0024] See appendix Figure 3 The upward-punching rotary auxiliary assembly 2-3 includes a first assembly upper cover 2-3-1, a first assembly body 2-3-2, and two bearings spaced vertically within the first assembly body 2-3-2. The bottom of the upward punch 2-4 is positioned between the two bearings. A spring-loaded tightening control mechanism is provided on the side of the first assembly body 2-3-2, located between the two bearings. The spring-loaded tightening control mechanism is a ball screw, and a groove 2-3-3 that mates with the ball screw is provided on the side of the first assembly body 2-3-2.

[0025] See appendix Figure 5The lower punch rotation auxiliary assembly 3-3 includes a second assembly lower cover 3-3-1 and a second assembly body 3-3-2. Two bearings are arranged vertically and horizontally within the second assembly body 3-3-2, and the bottom of the lower punch 3-4 is arranged between the two bearings.

[0026] See appendix Figure 7 The mandrel assembly 4-3 includes a third assembly lower cover 4-3-1, a third assembly body 4-3-2, and two bearings arranged vertically and horizontally within the third assembly body 4-3-2. The bottom of the mandrel 4-4 is located between the two bearings.

[0027] To ensure the accuracy of the helical gear after molding, the single-sided gap between the molding die 1, the upper punch assembly, the lower punch assembly and the mandrel assembly is 0.01-0.015mm.

[0028] In practical use, the mold of this utility model is equipped with lifting drive devices for each component as needed. First, the forming die 1 and the lower punch assembly cooperate to form a cavity. Then, powder is filled into the cavity. The upper punch 2-4 descends, and the mandrel 4-4 and lower punch 3-4 rise. With the help of the cavity block 1-1, the upper punch 2-4 and lower punch 3-4 rotate, with the lower punch 3-4 passively rotating along with the forming die 1. The pressing process produces a helical gear blank. After pressing, the lower punch assembly and mandrel assembly descend, and the upper punch assembly rises to remove the formed workpiece, thus completing the demolding process.

[0029] The pressed helical gear blank undergoes sintering, heat treatment, and other processes to meet the design requirements of the helical gear, ultimately forming a helical gear as shown in Figure 8.

[0030] 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 helical gears, comprising a forming middle die (1), an upper punch assembly, a lower punch assembly and a core rod assembly, characterized in that: In the cavity of the forming die (1), a cavity block (1-1) for forming the outer contour structure of the helical gear is arranged; the upper punch assembly comprises an upper punch base (2-1), an upper punch cover (2-2), an upper punch rotation auxiliary assembly (2-3) arranged in sequence from top to bottom, and an upper punch (2-4) arranged in the upper punch rotation auxiliary assembly (2-3); the lower punch assembly comprises a lower punch base (3-1), a lower punch cover (3-2), a lower punch rotation auxiliary assembly (3-3) arranged in sequence from bottom to top, and a lower punch (3-4) arranged in the lower punch rotation auxiliary assembly (3-3); the core rod assembly comprises a core rod base (4-1), a core rod cover (4-2), a core rod assembly (4-3) arranged in sequence from bottom to top, and a core rod (4-4) arranged in the core rod assembly (4-3).

2. The powder metallurgy forming die for helical gears according to claim 1, characterized in that: The upper punch (2-4) and the lower punch (3-4) are provided with helical gears outside the punch heads.

3. The powder metallurgy forming die for helical gears according to claim 1, characterized by: The upper punch rotation auxiliary assembly (2-3) comprises a first assembly upper cover (2-3-1), a first assembly body (2-3-2), two bearings arranged in an upper and lower interval in the first assembly body (2-3-2), and the upper punch (2-4) is arranged between the two bearings, and a spring pressing control mechanism is arranged in the side of the first assembly body (2-3-2) and located between the two bearings.

4. The powder metallurgy forming die for helical gears according to claim 3, characterized in that: The spring pressing control mechanism is a wave bead screw, and the side of the first assembly body (2-3-2) is provided with a groove (2-3-3) matched with the wave bead screw.

5. The powder metallurgy forming die for helical gears according to claim 1, characterized by: The lower punch rotation auxiliary assembly (3-3) comprises a second assembly lower cover (3-3-1), a second assembly body (3-3-2), two bearings arranged in an upper and lower interval in the second assembly body (3-3-2), and the lower punch (3-4) is arranged between the two bearings.

6. The powder metallurgy forming die for helical gears according to claim 1, characterized by: The core rod assembly (4-3) comprises a third assembly lower cover (4-3-1), a third assembly body (4-3-2), two bearings arranged in an upper and lower interval in the third assembly body (4-3-2), and the core rod (4-4) is arranged between the two bearings.

7. A powder metallurgical forming die for helical gears according to any one of claims 1-6, characterized in that: The single-side gap between the forming die (1), the upper punch assembly, the lower punch assembly and the core rod assembly is 0.01-0.015mm.

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