A powder metallurgy forming die for splicing double-sided gears

Abstract

A powder metallurgy forming die for splicing double-sided teeth belongs to the field of mold manufacturing. It is composed of an upper half tooth die, a lower half tooth die and a powder column die for welding to form double-sided teeth. The upper half tooth die includes a forming female die, a forming upper punch 1, a forming lower punch and a forming mandrel; the lower half tooth die includes a forming upper punch 2, a forming female die, a forming lower punch and a forming mandrel shared with the upper half tooth die; a cylindrical groove and a gear tooth groove are arranged in the inner cavity of the forming female die from top to bottom, a gear-shaped structure matching the gear tooth groove is arranged on the outer side of the forming lower punch, an arc groove and a first boss are arranged on the stamping end face of the forming upper punch 1, an arc boss and a second boss are arranged on the stamping end face of the forming upper punch 2, and a cylindrical boss is arranged in the middle of the arc boss. By reasonably designing the structure of each component, the double-sided teeth are divided into upper and lower pieces for die casting respectively, and the double-sided teeth composed of the upper and lower pieces are sintered and heat-treated by the powder column, thereby reducing labor and mold costs.

Description

Technical Field

[0001] The utility model belongs to the field of mold manufacturing, and in particular relates to a powder metallurgy forming mold for splicing double-sided teeth. Background Art

[0002] Molds are various molds and tools used in industrial production to form the desired products by injection molding, blow molding, extrusion, die casting or forging, smelting, stamping, stretching and other methods. Powder metallurgy is an industrial technology that produces metal powder or uses metal powder (or a mixture of metal powder and non-metallic powder) as raw materials, and produces metal materials, composite materials and various types of products through molding and sintering. 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] The structure of the double-sided teeth is manufactured through powder metallurgy technology, which requires a specific molding die for pressing and molding. The die structure is relatively complex and the manufacturing cost is high. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a powder metallurgy forming mold for splicing double-sided teeth. By reasonably designing the structure of each component, the double-sided tooth is divided into an upper and a lower piece and die-cast separately. The double-sided tooth composed of the upper and lower pieces is sintered and heat-treated by a powder column to meet the finishing requirements of the double-sided tooth, thereby realizing large-scale and high-precision manufacturing of the double-sided tooth and reducing labor costs and mold costs.

[0005] The technical solution adopted by the utility model is: a powder metallurgy forming mold for splicing double-sided teeth, which is composed of an upper half-tooth mold, a lower half-tooth mold and a medicine column mold for welding to form double-sided teeth, the upper half-tooth mold includes a forming female mold, a forming upper punch, a forming lower punch and a forming core rod; the lower half-tooth mold includes a forming upper punch, a forming female mold, a forming lower punch and a forming core rod shared with the upper half-tooth mold; a cylindrical groove and a gear tooth groove are arranged in sequence from top to bottom in the inner cavity of the forming female mold, a gear-shaped structure matching the gear tooth groove is arranged on the outer side of the forming lower punch, an arc-shaped groove and a first boss are arranged on the stamping end face of the forming upper punch, an arc-shaped boss and a second boss are arranged on the stamping end face of the forming upper punch, which match the arc-shaped groove, and a cylindrical boss is arranged in the middle of the arc-shaped boss.

[0006] Furthermore, a third boss for forming a keyway is provided on the outer side of the forming mandrel, and keyways matching the third boss are provided in the first forming upper punch, the second forming upper punch and the lower forming punch.

[0007] Furthermore, the medicine column mold includes a medicine column female mold, a medicine column upper punch and a medicine column lower punch. The inner cavity of the medicine column female mold is a cylindrical through hole. The medicine column upper punch and the medicine column lower punch are inserted into the cylindrical through hole to form a medicine column cavity. The diameter of the cylindrical through hole is equal to the diameter of the cylindrical boss.

[0008] Furthermore, the single-side gap between the drug column female mold and the drug column upper punch and drug column lower punch is 0.01-0.015mm.

[0009] Furthermore, the arc-shaped groove includes two symmetrically distributed long arc-shaped grooves and one short arc-shaped groove, and the arc-shaped boss includes two symmetrically distributed long arc-shaped bosses and one short arc-shaped boss.

[0010] Furthermore, the first bosses are symmetrically distributed at two ends of the short arc-shaped groove, and the second bosses are symmetrically distributed at two ends of the short arc-shaped boss.

[0011] Furthermore, the single-side clearance between the forming female die and the first forming upper punch, the second forming upper punch and the lower forming punch is 0.01-0.015 mm.

[0012] Furthermore, the single-side gaps between the forming mandrel and the first forming upper punch, the second forming upper punch, and the forming lower punch are all 0.01-0.015 mm.

[0013] The beneficial effects produced by adopting the utility model are as follows: by reasonably designing the structure of each component, the double-sided tooth is divided into an upper and a lower piece and die-casted separately, and the double-sided tooth composed of the upper and lower pieces is sintered and heat-treated by a powder column, thereby meeting the finishing requirements of the double-sided tooth, thereby realizing large-scale and high-precision manufacturing of the double-sided tooth, and reducing labor costs and mold costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the female forming mold;

[0015] Figure 2 This is a schematic diagram of the structure of the upper punch of the forming machine;

[0016] Figure 3 It is a schematic diagram of the structure of the second upper punch of the forming machine;

[0017] Figure 4 It is a structural schematic diagram of the forming lower punch;

[0018] Figure 5 It is a schematic diagram of the structure of the forming mandrel;

[0019] Figure 6 It is a schematic diagram of the structure of the drug column negative mold;

[0020] Figure 7 It is a schematic diagram of the structure of the upward charge column;

[0021] Figure 8 It is a schematic diagram of the structure of the downward rush of the powder column;

[0022] Fig. 9 It is a schematic diagram of the structure of spliced ​​double-sided teeth;

[0023] In the accompanying drawings: 1 is a forming female mold, 1-1 is a cylindrical groove, 1-2 is a gear tooth groove, 2 is a forming upper punch one, 2-1 is an arcuate groove, 2-2 is a first boss, 3 is a forming upper punch two, 3-1 is an arcuate boss, 3-2 is a second boss, 3-3 is a cylindrical boss, 4 is a forming lower punch, 5 is a forming core rod, 6-1 is a third boss, 6-2 is a keyway, 7-1 is a drug column female mold, 7-1-1 is a cylindrical through hole, 7-2 is a drug column upper punch, and 7-3 is a drug column lower punch. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.

[0025] See attached Figure 1-5 , a powder metallurgy forming mold for splicing double-sided teeth, consisting of an upper half tooth mold, a lower half tooth mold and a medicine column mold for welding to form double-sided teeth, the upper half tooth mold comprising a forming female mold 1, a forming upper punch 2, a forming lower punch 4 and a forming core rod 5; the lower half tooth mold comprising a forming upper punch 3, a forming female mold 1, a forming lower punch 4 and a forming core rod 5 shared with the upper half tooth mold; a cylindrical groove 1-1 and a gear tooth groove 1-2 are arranged in the inner cavity of the forming female mold 1 from top to bottom, a gear-shaped structure matching the gear tooth groove 1-2 is arranged on the outer side of the forming lower punch 4, an arc groove 2-1 and a first boss 2-2 are arranged on the stamping end face of the forming upper punch 2, an arc boss 3-1 and a second boss 3-2 are arranged on the stamping end face of the forming upper punch 2 3 matching the arc groove 2-1, and a cylindrical boss 3-3 is arranged in the middle of the arc boss 3-1. A third boss 6 - 1 for forming a keyway is provided on the outer side of the forming mandrel 5 , and a keyway 6 - 2 matching the third boss 6 - 1 is provided inside the forming upper punch 1 2 , the forming upper punch 2 3 and the forming lower punch 4 .

[0026] See attached Figure 2 The arc-shaped groove 2-1 includes two symmetrically distributed long arc-shaped grooves and one short arc-shaped groove, and the arc-shaped boss 3-1 includes two symmetrically distributed long arc-shaped bosses and one short arc-shaped boss.

[0027] See attached Figure 3 The first boss 2-2 is symmetrically distributed at both ends of the short arc groove, and the second boss 3-2 is symmetrically distributed at both ends of the short arc boss.

[0028] To ensure the accuracy of the double-sided teeth after forming, the single-side clearance between the forming female die 1 and the forming upper punch 1 2, the forming upper punch 2 3, and the forming lower punch 4 is 0.01-0.015mm. The single-side clearance between the forming mandrel 5 and the forming upper punch 1 2, the forming upper punch 2 3, and the forming lower punch 4 is 0.01-0.015mm.

[0029] See attached Figure 6-7 The medicine column mold includes a medicine column female mold 7-1, a medicine column upper punch 7-2 and a medicine column lower punch 7-3. The inner cavity of the medicine column female mold 7-1 is a cylindrical through hole 7-1-1. The medicine column upper punch 7-2 and the medicine column lower punch 7-3 are inserted into the cylindrical through hole 7-1-1 to form a medicine column cavity. The diameter of the cylindrical through hole 7-1-1 is equal to the diameter of the cylindrical boss 3-3.

[0030] In order to ensure the accuracy of the drug column after molding, the single-side gap between the drug column female mold 7-1 and the drug column upper punch 7-2 and the drug column lower punch 7-3 is 0.01-0.015mm.

[0031] When the mold of the utility model is used, the upper piece of the double-sided gear is pressed, and each component in the device is equipped with a lifting drive device as needed. First, the forming female mold 1 and the forming lower punch 4 cooperate with each other to form a cavity, and then the powder is filled into the above-mentioned cavity, the forming core rod 5 rises, and the forming upper punch 2 falls. After the pressing is completed, the forming lower punch 4 and the forming core rod 5 fall respectively, and the forming upper punch 2 rises, and the formed workpiece is taken out, and the demoulding is completed. The upper half of the double-sided gear is obtained by punching.

[0032] Similarly, when pressing the lower piece of the double-sided gear, each component in the device is equipped with a lifting drive device as needed. First, the forming female mold 1 and the forming lower punch 4 cooperate with each other to form a cavity, and then the powder is filled into the above-mentioned cavity, the forming core rod 6 rises, and the forming upper punch 2 3 falls. After the pressing is completed, the forming lower punch 4 and the forming core rod 5 fall respectively, and the forming upper punch 2 3 rises, and the formed workpiece is taken out, and the demoulding is completed. The lower half of the double-sided gear is obtained by punching.

[0033] Similarly, the medicine column between the upper and lower pieces of the double-sided teeth is pressed. Each component in the device is equipped with a lifting drive device as needed. The medicine column female mold 7-1 and the medicine column lower punch 7-3 cooperate with each other to form a medicine column cavity, and then the powder is filled into the above-mentioned cavity, and the medicine column upper punch 7-2 descends. After the pressing is completed, the medicine column lower punch 7-3 descends, and the medicine column upper punch rises, and the formed workpiece is taken out. After demolding, the medicine column is obtained.

[0034] The upper and lower pieces of the double-sided tooth obtained by pressing, and the medicine column are combined, and through sintering, heat treatment and other processes, the design requirements of the double-sided tooth are met, and finally a double-sided tooth as shown in 9 is formed.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods 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 solution of the utility model, which should be included in the scope of the technical solution for protection of the utility model.

Claims

1. A powder metallurgy forming die for splicing double-sided teeth, consisting of an upper half tooth die, a lower half tooth die and a powder column die for welding to form a double-sided tooth, characterized in that: The upper half-tooth mold comprises a female molding die (1), a first upper molding punch (2), a lower molding punch (4) and a molding core rod (5); the lower half-tooth mold comprises a second upper molding punch (3), a female molding die (1) shared with the upper half-tooth mold, a lower molding punch (4) and a molding core rod (5); a cylindrical groove (1-1) and a gear tooth groove (1-2) are sequentially arranged in the inner cavity of the female molding die (1) from top to bottom, a gear-shaped structure matching the gear tooth groove (1-2) is arranged on the outer side of the lower molding punch (4), an arc-shaped groove (2-1) and a first boss (2-2) are arranged on the stamping end face of the first upper molding punch (2), an arc-shaped boss (3-1) matching the arc-shaped groove (2-1) and a second boss (3-2) are arranged on the stamping end face of the second upper molding punch (3), and a cylindrical boss (3-3) is arranged in the middle of the arc-shaped boss (3-1).

2. The powder metallurgy forming die for splicing double-sided gears according to claim 1, characterized in that: A third boss (6-1) for forming a keyway is provided on the outside of the forming core rod (5), and a keyway (6-2) matching the third boss (6-1) is provided inside the first forming upper punch (2), the second forming upper punch (3) and the lower forming punch (4).

3. The powder metallurgy forming die for spliced ​​double-sided gears according to claim 1, characterized in that: The drug column mold comprises a drug column female mold (7-1), a drug column upper punch (7-2) and a drug column lower punch (7-3); the inner cavity of the drug column female mold (7-1) is a columnar through hole (7-1-1); the drug column upper punch (7-2) and the drug column lower punch (7-3) are inserted into the columnar through hole (7-1-1) to form a drug column cavity; the diameter of the columnar through hole (7-1-1) is equal to the diameter of the columnar boss (3-3).

4. The powder metallurgy forming die for spliced ​​double-sided gears according to claim 3, characterized in that: The single-side clearance between the drug column female mold (7-1) and the drug column upper punch (7-2) and drug column lower punch (7-3) is 0.01-0.015 mm.

5. The powder metallurgy forming die for spliced ​​double-sided gears according to claim 1, characterized in that: The arc-shaped groove (2-1) comprises two symmetrically distributed long arc-shaped grooves and one short arc-shaped groove, and the arc-shaped boss (3-1) comprises two symmetrically distributed long arc-shaped bosses and one short arc-shaped boss.

6. The powder metallurgy forming die for spliced ​​double-sided gears according to claim 5, characterized in that: The first bosses (2-2) are symmetrically distributed at both ends of the short arc-shaped groove, and the second bosses (3-2) are symmetrically distributed at both ends of the short arc-shaped boss.

7. The powder metallurgy forming die for spliced ​​double-sided gears according to claim 1, characterized in that: The single-side clearance between the forming female die (1) and the first forming upper punch (2), the second forming upper punch (3), and the forming lower punch (4) is 0.01-0.015 mm.

8. The powder metallurgy forming die for spliced ​​double-sided gears according to claim 1, characterized in that: The single-side clearances between the forming core rod (5) and the first forming upper punch (2), the second forming upper punch (3), and the forming lower punch (4) are all 0.01-0.015 mm.

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