Helical tooth inner gear ring forming and pressing die

Abstract

The utility model relates to the technical field of helical tooth inner gear ring forming equipment, in particular to a helical tooth inner gear ring forming and pressing die, which is provided with an upper punch, a lower punch, a middle die plate and a core rod, and is characterized in that a die hole is arranged in the middle of the middle die plate, the upper end of the die hole is sealed by the upper punch, the lower punch is inserted into the die hole, and the core rod is inserted into the lower punch. A core rod inserting hole is formed in the middle of the lower punch, outer oblique teeth are arranged on the circumference of the outer side of the upper end of the core rod, inner oblique teeth meshed and matched with the outer oblique teeth are arranged in the core rod inserting hole of the lower punch, the upper end of the core rod extends out of the upper end of the lower punch and extends to the upper end of the middle die plate, and the lower end of the core rod is rotationally connected with a core rod pulling plate. A helical tooth inner gear ring forming groove is formed among the lower end face of the upper punch, the inner wall of the die hole of the middle die plate, the upper end face of the lower punch and the outer helical teeth on the outer side of the upper end of the core rod. The helical tooth inner gear ring forming die has the advantages of being simple in structure, high in machining speed, high in yield and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of helical gear internal gear ring forming equipment, in particular to a helical gear internal gear ring forming pressing die. Background Art

[0002] As we all know, powder metallurgy helical internal gear rings are common products among powder metallurgy parts, accounting for more than 30% of the entire electric wrench industry. Their design directly affects product quality. Therefore, a reasonable design is very important for service life.

[0003] Helical internal gear rings are used under harsh working conditions of high temperature and high speed. Wear resistance is the main factor affecting the life of the electric wrench. The larger the helix angle of the helical internal gear ring, the better the durability of the electric wrench under the same conditions. From the perspective of the production and manufacturing of helical internal gear rings, the larger the helix angle, the shorter the service life of the mold and the higher the product manufacturing cost. Moreover, when producing the structure of the helical internal gear ring, the inner core of the mold is required to rotate during demoulding. Once the rotation is stuck, the internal teeth will be damaged, resulting in a decrease in the yield of the gear ring. Summary of the Invention

[0004] The purpose of the utility model is to solve the above-mentioned deficiencies in the prior art and to provide a helical internal gear ring forming pressing die with a simple structure, high processing speed and high yield.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A helical gear internal gear ring forming pressing die is provided with an upper punch, a lower punch, a middle template and a core rod, and is characterized in that a die hole is provided in the middle of the middle template, the upper end of the die hole is closed by the upper punch, the lower punch is inserted into the inside of the die hole, a core rod insertion hole is provided in the middle of the lower punch, an outer helical tooth is provided on the outer circumference of the upper end portion of the core rod, an inner helical tooth meshing with the outer helical tooth is provided in the core rod insertion hole of the lower punch, the upper end of the core rod extends out of the upper end of the lower punch and extends to the upper end position of the middle template, the lower end of the core rod is rotatably connected to the core rod pull plate, and a helical gear internal gear ring forming groove is formed between the lower end face of the upper punch, the inner wall of the die hole of the middle template, the upper end face of the lower punch and the outer helical tooth on the outer side of the upper end of the core rod.

[0007] The lower end circumference of the mandrel described in the utility model is provided with a mandrel convex plate, the mandrel convex plate is integrally connected to the lower end of the mandrel, a mandrel pressure cover is provided above the mandrel convex plate, the middle part of the mandrel pressure cover is provided with a through hole for the mandrel to pass through, the inner end of the mandrel pressure cover is rotatably connected to the mandrel convex plate on the mandrel via a plane bearing, and the outer end of the mandrel pressure cover is fixedly connected to the mandrel pull plate.

[0008] The lower end of the lower punch described in the utility model is provided with a lower punch convex plate in the circumferential direction of the outer side, the lower punch convex plate is integrally connected with the lower end of the lower punch, a lower punch cover is provided above the lower punch convex plate, the middle part of the lower punch cover is provided with a through hole for the lower punch to pass through, the inner end of the lower punch cover is pressed above the lower punch convex plate, the outer end of the lower punch cover is fixedly connected to the lower punch pull plate, and the lower punch pull plate is provided with a through hole for the core rod to pass through.

[0009] The mandrel gland and the mandrel pull plate of the utility model are detachably connected via a first bolt, which facilitates the disassembly of the mandrel gland and the mandrel pull plate and the replacement of mandrels of different types.

[0010] The lower punch cover and the lower punch plate of the utility model are detachably connected via the second bolt, which facilitates the disassembly of the lower punch cover and the lower punch plate and the replacement of lower punches and core rods of different models.

[0011] The utility model has the advantages of simple structure, fast processing speed, high yield rate, etc. due to the adoption of the above structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of the present utility model.

[0013] Figure 2 yes Figure 1 Schematic diagram of the structure of the middle and lower punches.

[0014] Figure 3 yes Figure 1 Schematic diagram of the structure of the core rod. DETAILED DESCRIPTION

[0015] The present invention is further described below with reference to the accompanying drawings:

[0016] As shown in the accompanying drawings, a helical gear internal gear ring forming pressing die is provided with an upper punch 1, a lower punch 2, a middle template 3, and a core rod 4, characterized in that a die hole is provided in the middle of the middle template 3, the upper end of the die hole is closed by the upper punch 1, and the lower punch 2 is inserted into the inside of the die hole, a core rod insertion hole 5 is provided in the middle of the lower punch 2, and an outer helical tooth 6 is provided on the outer circumference of the upper end portion of the core rod 4. The core rod insertion hole 5 of the lower punch 2 is provided with an inner helical tooth 7 meshing with the outer helical tooth 6. The upper end of the core rod 4 extends out of the upper end of the lower punch 2 and extends to the upper end position of the middle template 3. The lower end of the core rod 4 is rotatably connected to the core rod pulling plate 8. A helical gear internal gear ring forming groove is formed between the lower end face of the upper punch 1, the inner wall of the die hole of the middle template 3, the upper end face of the lower punch 2, and the outer helical tooth 6 on the outer side of the upper end of the core rod 4.

[0017] Furthermore, a core rod convex plate 9 is provided on the circumference of the lower end of the core rod 4, and the core rod convex plate 9 is integrally connected to the lower end of the core rod 4. A core rod pressure cover 10 is provided above the core rod convex plate 9, and a through hole is provided in the middle of the core rod pressure cover 10 for the core rod 4 to pass through. The inner end of the core rod pressure cover 10 is rotatably connected to the core rod convex plate 9 on the core rod 4 through a plane bearing 11, and the outer end of the core rod pressure cover 10 is fixedly connected to the core rod pull plate 8.

[0018] Furthermore, a lower punch convex plate 12 is provided on the outer circumferential direction of the lower end of the lower punch 2, and the lower punch convex plate 12 is integrally connected to the lower end of the lower punch 2. A lower punch cover 13 is provided above the lower punch convex plate 12, and a through hole is provided in the middle of the lower punch cover 13 for the lower punch 2 to pass through. The inner end of the lower punch cover 13 is pressed on the upper part of the lower punch convex plate 12, and the outer end of the lower punch cover 13 is fixedly connected to the lower punch plate 14, and the lower punch plate 14 is provided with a through hole for the core rod 4 to pass through.

[0019] Furthermore, the mandrel cover 10 and the mandrel pull plate 8 are disassembled and connected via a first bolt 15, which facilitates the disassembly of the mandrel cover 10 and the mandrel pull plate 8 and the replacement of mandrels 4 of different models. The mandrel cover 10 mentioned above is provided with a bolt through hole, and the mandrel pull plate 8 is provided with a threaded hole. The first bolt 15 passes through the bolt through hole and is connected to the threaded hole on the mandrel pull plate 8.

[0020] Furthermore, the lower punch cover 13 and the lower punch plate 14 are disassembled and connected via a second bolt 16, which facilitates the disassembly of the lower punch cover 13 and the lower punch plate 14 and the replacement of lower punches 2 and core rods 4 of different models. The lower punch cover 13 mentioned above is provided with a bolt through hole, and the lower punch plate 14 is provided with a threaded hole. The second bolt 16 passes through the bolt through hole and is connected to the threaded hole on the lower punch plate 14.

[0021] The outer bevel teeth 6 are arranged at the upper end of the mandrel 4. The upper end of the mandrel 4 is provided with a plug 17 for inserting the upper punch 1. The upper punch hole of the mandrel 4 is provided with a through hole for inserting the plug 17. The upper end of the mandrel 4 is inserted into the upper punch 1 through the plug 17 to ensure the combined effect of the upper punch 1 and the mandrel 4.

[0022] After the mold is demolded, the mold base 1 is tightened, and the mold is then pushed down and the mold is ejected. The upper end face of the core rod convex plate 9 contacts the lower end face of the plane bearing 11 without relative sliding, and the upper end face of the plane bearing 11 is in static contact with the lower end face of the core rod pressure cover 10 without relative sliding, effectively reducing the friction borne by the core rod pulling plate 8, and at the same time avoiding the jamming between the core rod convex plate 9 and the core rod 4 pressure plate due to the entry of iron powder raw materials. During the demoulding process, the inner gear ring does not move, and the core rod 4 rotates and descends; the design of the plane bearing 11 reduces the friction between the core rod convex plate 9 and the core rod pressure cover 10, increases its service life, and effectively avoids the iron powder raw materials from falling into the bearing while ensuring that the production efficiency is not reduced, thereby improving the service life of the mold and having high reliability. Due to the above structure, the utility model has the advantages of simple structure, fast processing speed and high yield rate.

Claims

1. A helical gear ring forming die, comprising an upper punch, a lower punch, a middle die plate, and a core rod, characterized in that A die hole is provided in the middle of the middle template, the upper end of the die hole is closed by the upper punch, the lower punch is inserted into the inside of the die hole, a core rod insertion hole is provided in the middle of the lower punch, and an outer bevel tooth is provided on the outer circumference of the upper end of the core rod. The core rod insertion hole of the lower punch is provided with an inner bevel tooth engaged with the outer bevel tooth. The upper end of the core rod extends out of the upper end of the lower punch and extends to the upper end position of the middle template. The lower end of the core rod is rotatably connected to the core rod pull plate. A bevel inner gear ring forming groove is formed between the lower end face of the upper punch, the inner wall of the die hole of the middle template, the upper end face of the lower punch, and the outer bevel tooth on the outer side of the upper end of the core rod.

2. The helical gear ring forming die according to claim 1, characterized in that The lower end circumference of the mandrel is provided with a mandrel convex plate, which is integrally connected to the lower end of the mandrel. A mandrel pressure cover is provided above the mandrel convex plate, and a through hole is provided in the middle of the mandrel pressure cover for the mandrel to pass through. The inner end of the mandrel pressure cover is rotatably connected to the mandrel convex plate on the mandrel via a plane bearing, and the outer end of the mandrel pressure cover is fixedly connected to the mandrel pull plate.

3. The helical internal gear ring forming die according to claim 1, characterized in that A lower punch convex plate is provided on the outer circumferential direction of the lower end of the lower punch, and the lower punch convex plate is integrally connected to the lower end of the lower punch. A lower punch cover is provided above the lower punch convex plate, and a through hole is provided in the middle of the lower punch cover for the lower punch to pass through. The inner end of the lower punch cover is pressed on the upper part of the lower punch convex plate, and the outer end of the lower punch cover is fixedly connected to the lower punch pull plate, and the lower punch pull plate is provided with a through hole for the core rod to pass through.

4. The helical internal gear ring forming die according to claim 2, characterized in that The core rod gland and the core rod pull plate are detachably connected via a first bolt.

5. The helical internal gear ring forming die according to claim 3, characterized in that The lower punch cover and the lower punch plate are detachably connected via a second bolt.

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