A forming mold for an external fixed boss of a helical internal gear ring

Abstract

This utility model relates to the field of powder metallurgy product molding technology, specifically a forming mold for an external fixed boss of a helical internal gear ring. It includes a middle template with a forming hole in its center. Above the middle template are an upper inner punch and an upper outer punch, and below the middle template are a lower punch and a mandrel mold. The upper inner punch includes an upper inner punch plate and an upper inner punch head, which are fixedly connected. The upper outer punch includes an upper outer punch plate and an upper outer punch head, which are fixedly connected. The lower punch includes a lower punch plate and a lower punch head, which are fixedly connected. The mandrel mold includes a mandrel punch plate and a mandrel punch head, which are rotatably connected. After the upper inner punch, upper outer punch, lower punch, and mandrel punch head are closed with the middle mold, a helical internal gear ring forming cavity is formed. This design has advantages such as simple structure, good forming effect, high forming efficiency, and low cost.

Description

Technical Field

[0001] This utility model relates to the field of powder metallurgy product forming technology, specifically a forming mold for an external fixed boss of a helical gear internal gear ring that is simple in structure, has good forming effect, high forming efficiency, and low cost. Background Technology

[0002] As is well known, powder metallurgy helical internal gear rings are a standard product in powder metallurgy parts, accounting for more than 30% of the total usage in the electric wrench industry. Their design directly affects product quality. Therefore, a reasonable design is crucial for service life.

[0003] When used in harsh conditions of high temperature and high speed, wear resistance is the main factor affecting the life of electric wrenches. 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 manufacturing helical internal gear rings, the larger the helix angle, the lower the mold life and the higher the product manufacturing cost.

[0004] Currently, the structure of a helical internal gear ring includes a helical gear ring body, helical tooth grooves on the inner wall of the helical gear ring, and a snap-fit ​​protrusion on the circumference of the end face of one end of the helical gear ring. The forming method of this type of helical internal gear ring is generally to form a helical gear ring body with an annular protrusion at the end in one piece, and then cut the annular protrusion to form the snap-fit ​​protrusion by wire cutting. This method is formed by cutting, which results in serious material waste, high cost, low forming efficiency and poor forming effect. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a simple, effective, efficient, and low-cost mold for forming the outer fixed boss of a helical gear internal gear ring.

[0006] The technical solution adopted by this utility model to solve its technical problem is: A forming mold for an external fixed boss of a helical internal gear ring includes a middle template with a forming hole in its center. The mold is characterized by having an upper inner punch and an upper outer punch above the middle template, and a lower punch and a mandrel mold below the middle template. The upper inner punch includes an upper inner punch plate and an upper inner punch head, which are fixedly connected. The upper outer punch includes an upper outer punch plate and an upper outer punch head, which are fixedly connected. The lower punch includes a lower punch plate and a lower punch head, which are fixedly connected. The mandrel mold includes a mandrel punch plate and a mandrel punch head, which are rotatably connected. A forming hole is provided in the center of the upper inner punch. The upper mandrel insert hole through which the mandrel passes, the upper outer punch plate and the upper outer punch head are provided with an upper inner punch insert hole for the upper inner punch head to pass through, the side wall of the upper inner punch head extending below the upper outer punch plate is provided with an inner forming slot with a lower opening, the lower end of the upper outer punch is provided with an outer forming insert that mates with the inner forming slot and extends into the inner forming slot, the lower end of the inner forming slot and the outer forming insert after mating forms a snap-fit ​​protrusion forming groove, the lower punch head and the lower punch plate are provided with a lower mandrel insert hole for the mandrel to pass through, the upper end of the mandrel punch head is provided with a forming oblique tooth groove on the outside, the upper inner punch head, the upper outer punch head, the lower punch head and the mandrel punch head are closed with the middle mold to form an oblique tooth inner tooth ring forming cavity.

[0007] The upper outer punch plate and the upper outer punch head described in this utility model are connected by an upper outer cover plate. The upper outer punch head is T-shaped, and the upper outer cover plate is provided with a T-shaped groove. The upper outer cover plate passes through the upper outer punch head and is fixedly connected to the upper outer punch plate.

[0008] The upper inner punch plate and the upper inner punch head described in this utility model are connected by an upper inner cover plate. The upper inner punch head is T-shaped, and the upper inner cover plate is provided with a T-shaped groove. The upper inner cover plate passes through the upper inner punch head and is fixedly connected to the upper inner punch plate.

[0009] The lower punch plate and the lower punch head described in this utility model are connected by a lower punch cover plate. The lower punch head is T-shaped, and the lower punch cover plate is provided with a T-shaped groove. The lower punch cover plate passes through the lower punch head and is fixedly connected to the lower punch plate.

[0010] The mandrel punch and mandrel punch plate of this utility model are connected by a rotating component and a mandrel cover plate. The mandrel punch is T-shaped, and the mandrel cover plate is provided with a T-shaped slot. After the mandrel cover plate passes through the mandrel punch, it is fixedly connected to the mandrel punch plate. The lower end of the mandrel punch is rotatably connected to the upper surface of the mandrel punch plate via the rotating component.

[0011] The rotating component described in this utility model is a bearing or a spiral plate that can achieve rotation.

[0012] This utility model, due to the above-mentioned structure, has the advantages of simple structure, good molding effect, high molding efficiency and low cost. Attached Figure Description

[0013] Figure 1This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 yes Figure 1 A schematic diagram of a one-piece molded helical internal gear ring.

[0015] Figure 3 yes Figure 2 A schematic diagram of the lower end face structure.

[0016] Figure 4 yes Figure 3 AA sectional view.

[0017] Figure 5 yes Figure 2 A schematic diagram of the upper surface structure. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings: As shown in the attached figure, a forming mold for an external fixed boss of a helical internal gear ring includes a middle template 1 with a forming hole in the middle. The middle template 1 is characterized by having an upper inner punch and an upper outer punch above it, and a lower punch and a mandrel mold below it. The upper inner punch includes an upper inner punch plate 2 and an upper inner punch 3, which are fixedly connected. The upper outer punch includes an upper outer punch plate 4 and an upper outer punch 5, which are fixedly connected. The lower punch includes a lower punch plate 6 and a lower punch 7, which are fixedly connected. The mandrel mold includes a mandrel punch plate 8 and a mandrel punch 9, which are rotatably connected. The upper inner punch 3 has a center for the mandrel to pass through. The upper inner punch 3 has an upper inner punch 11 for the upper inner punch 3 to pass through, and an inner forming slot 12 with an opening at the lower end is provided on the side wall of the upper inner punch 3 extending below the upper outer punch 4. The lower end of the upper outer punch has an outer forming strip 13 that cooperates with the inner forming slot 12 and extends into the inner forming slot 12. The lower end of the inner forming slot 12 and the outer forming strip 13 after they cooperate form a snap-fit ​​protrusion forming groove. The lower punch 7 and the lower punch 6 have a lower mandrel insertion hole 14 for the mandrel to pass through, and the upper end of the mandrel punch 9 has a forming oblique tooth groove 15 on its outer side. After the upper inner punch 3, the upper outer punch 5, the lower punch 7 and the mandrel punch 9 are closed with the middle mold, an oblique tooth inner tooth ring forming cavity 16 is formed.

[0019] Furthermore, the upper outer punch plate 4 and the upper outer punch head 5 are connected by an upper outer cover plate 17. The upper outer punch head 5 is T-shaped, and the upper outer cover plate 17 is provided with a T-shaped groove. The upper outer cover plate 17 passes through the upper outer punch head 5 and is fixedly connected to the upper outer punch plate 4.

[0020] Furthermore, the upper inner punch plate 2 and the upper inner punch head 3 are connected by an upper inner cover plate 18. The upper inner punch head 3 is T-shaped, and the upper inner cover plate 18 is provided with a T-shaped groove. The upper inner cover plate 18 passes through the upper inner punch head 3 and is fixedly connected to the upper inner punch plate 2.

[0021] Furthermore, the lower punch plate 6 and the lower punch head 7 are connected by a lower punch cover plate 19. The lower punch head 7 is T-shaped, and the lower punch cover plate 19 is provided with a T-shaped groove. The lower punch cover plate 19 passes through the lower punch head 7 and is fixedly connected to the lower punch plate 6.

[0022] Furthermore, the mandrel punch 9 and the mandrel punch plate 8 are connected by a rotating component 20 and a mandrel cover plate 21. The mandrel punch 9 is T-shaped, and the mandrel cover plate 21 is provided with a T-shaped slot. The mandrel cover plate 21 passes through the mandrel punch 9 and is fixedly connected to the mandrel punch plate 8. The lower end of the mandrel punch 9 is rotatably connected to the upper end face of the mandrel punch plate 8 via the rotating component 20.

[0023] Furthermore, the rotating component 20 is a bearing or a spiral plate capable of rotation.

[0024] The aforementioned helical internal gear ring structure includes a helical gear ring body 22, an helical gear groove 23 on the inner wall of the helical gear ring body 22, and a snap-fit ​​protrusion 24 on the circumference of the end face of one end of the helical gear ring body 22.

[0025] In use, this invention first involves closing the lower punch 7 and mandrel punch 9 with the middle template 1 under the action of the lower punch plate 6 and mandrel punch plate 8. Then, the material is placed in the helical gear inner ring forming cavity 16. Next, the upper inner punch 3 moves down into the middle template 1, and the material is added to the inner forming slot 12 of the upper inner punch 3. After this, the upper outer punch 5 moves down to its original position, and then the upper inner punch 3 and upper outer punch 5 are pressed down together for pressing. After pressing and forming, the upper inner punch 3 and upper outer punch 5 move upwards, the middle template 1 moves downwards, and the mandrel moves downwards during the process. The rotation process enables the fabrication of the helical gear internal ring. Due to the cooperation between the inner forming slot 12 and the outer forming slot between the upper inner punch 3 and the upper outer punch 5, the integral forming of the limiting boss at the end of the helical gear internal ring can be guaranteed. This achieves powder metallurgy integral forming technology, eliminating the need for post-machining cutting processes, saving materials and costs. Furthermore, the integral forming effect is good, and the forming efficiency is high. This utility model, due to the above structure, has advantages such as simple structure, good forming effect, high forming efficiency, and low cost.

Claims

1. A forming mold for an outer fixed boss of a helical internal gear ring, comprising a middle template with a forming hole in the middle portion thereof, characterized in that... The middle template has an upper inner punch and an upper outer punch above it, and a lower punch and a mandrel mold below it. The upper inner punch includes an upper inner punch plate and an upper inner punch head, which are fixedly connected. The upper outer punch includes an upper outer punch plate and an upper outer punch head, which are fixedly connected. The lower punch includes a lower punch plate and a lower punch head, which are fixedly connected. The mandrel mold includes a mandrel punch plate and a mandrel punch head, which are rotatably connected. The upper inner punch has a mandrel insertion hole in its center for the mandrel to pass through. The upper outer punch plate and upper outer punch head... The upper inner punch has an upper inner punch insertion hole in the middle for the upper inner punch to pass through. The side wall of the upper inner punch, which extends below the upper outer punch plate, has an inner forming slot with an opening at the lower end. The lower end of the upper outer punch has an outer forming strip that mates with the inner forming slot and extends into the inner forming slot. The lower end of the inner forming slot and the outer forming strip together forms a snap-fit ​​protrusion forming groove. The lower punch and the lower punch plate have a lower mandrel insertion hole in the middle for the mandrel to pass through. The upper end of the mandrel punch has a forming oblique tooth groove on the outside. After the upper inner punch, upper outer punch, lower punch and mandrel punch are closed with the middle mold, they form an oblique tooth inner tooth ring forming cavity.

2. The forming mold for the outer fixed boss of a helical internal gear ring according to claim 1, characterized in that... The upper outer punch plate and the upper outer punch head are connected by an upper outer cover plate. The upper outer punch head is T-shaped, and the upper outer cover plate is provided with a T-shaped groove. The upper outer cover plate passes through the upper outer punch head and is fixedly connected to the upper outer punch plate.

3. The forming mold for the outer fixed boss of a helical internal gear ring according to claim 1, characterized in that... The upper inner punch plate and the upper inner punch head are connected by an upper inner cover plate. The upper inner punch head is T-shaped, and the upper inner cover plate is provided with a T-shaped groove. The upper inner cover plate passes through the upper inner punch head and is fixedly connected to the upper inner punch plate.

4. The forming mold for the outer fixed boss of a helical internal gear ring according to claim 1, characterized in that... The lower punch plate and the lower punch head are connected by a lower punch cover plate. The lower punch head is T-shaped, and the lower punch cover plate is provided with a T-shaped groove. The lower punch cover plate passes through the lower punch head and is fixedly connected to the lower punch plate.

5. A forming mold for an external fixed boss of a helical internal gear ring according to claim 1, characterized in that... The mandrel punch and the mandrel punch plate are connected by a rotating component and a mandrel cover plate. The mandrel punch is T-shaped, and the mandrel cover plate has a T-shaped slot. After the mandrel cover plate passes through the mandrel punch, it is fixedly connected to the mandrel punch plate. The lower end of the mandrel punch is rotatably connected to the upper surface of the mandrel punch plate via the rotating component.

6. A forming mold for an external fixed boss of a helical internal gear ring according to claim 5, characterized in that... The rotating component is a bearing or a spiral blade that can achieve rotation.

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