Bevel gear forming die with cam

Abstract

The utility model relates to the technical field of gear forming die structures, in particular to a helical gear forming die with a cam, which is provided with an upper punch, a middle die, a first lower punch, a second lower punch and a core rod, and is characterized in that an inner helical tooth groove is arranged on the inner wall of the middle die, the upper punch is arranged above the middle die, and the lower punch is arranged above the middle die. An inserting hole is formed in the lower end face of the upper punch, the first lower punch is arranged below the middle die, a cam hole is formed in the first lower punch in the axis direction, the second lower punch is arranged in the cam hole and extends into the cam hole, a core rod penetrating hole is formed in the second lower punch in the axis direction, and the core rod penetrates through the core rod penetrating hole of the second lower punch and is inserted into the inserting hole of the upper punch. Outer oblique tooth grooves are formed in the outer wall of the upper punch and the outer wall of the first lower punch respectively, a limiting protrusion is arranged on the empty inner wall of a cam of the first lower punch, a limiting key groove matched with a key groove of the first lower punch is formed in the outer wall of the second lower punch, and the forming die has the advantages of being simple in structure, good in forming effect, high in forming efficiency, capable of saving cost and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of gear forming die structures, and particularly to an inclined gear forming die with a cam, which has a simple structure, good forming effect, high forming efficiency and cost saving. Background Art

[0002] As is well known, powder metallurgy helical gears are conventional transmission parts in electric circular saw tools, and their usage accounts for more than 30% of the entire electric circular saw industry. Their design directly affects the quality of products. Therefore, reasonable design is very important for service life.

[0003] At present, the side of the existing helical gear has a cam structure, and it is very difficult to prepare by powder metallurgy technology. The general preparation method is to prepare and form by powder metallurgy method, and then cut and polish the side of the helical gear through cutting technology to form a cam structure. However, during the cutting and polishing process, the accuracy of the cam structure may be low. Therefore, the scrap rate of making helical gears is high, the cost is high, the forming effect is not good, and the forming efficiency is low. Summary of the Invention

[0004] The purpose of the utility model is to solve the deficiencies of the above-mentioned prior art, and provide an inclined gear forming die with a cam, which has a simple structure, good forming effect, high forming efficiency and cost saving.

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

[0006] An inclined gear forming die with a cam is provided with an upper punch, a middle die, a lower first punch, a lower second punch and a core rod. It is characterized in that an inner helical tooth groove is provided on the inner wall of the middle die, the upper punch is arranged above the middle die, a jack is provided on the lower end surface of the upper punch, the lower first punch is arranged below the middle die, a cam hole is provided in the axial direction of the lower first punch, the lower second punch is arranged in the cam hole, the lower second punch extends into the cam hole, a core rod through hole is provided in the axial direction of the lower second punch, the core rod passes through the core rod through hole of the lower second punch and is inserted into the jack of the upper punch. Outer helical tooth grooves are respectively provided on the outer walls of the upper punch and the lower first punch. A limiting protrusion is provided on the inner wall of the cam hole of the lower first punch, and a limiting key groove matched with the key groove of the lower first punch is provided on the outer wall of the lower second punch.

[0007] The upper punch of the utility model comprises an upper punching pad, an upper punching cover and an upper punching head. The cross section of the upper punching head is T-shaped. An annular groove is provided on the upper end surface of the upper punching cover, a through hole is provided at the bottom of the annular groove, the transverse part of the T-shaped upper punching head is arranged in the annular groove and is connected with the upper punching pad through a rotating part, the vertical part of the T-shaped upper punching head passes through the through hole and is inserted into the middle die, and the upper punching cover is fixed on the upper punching pad through bolts.

[0008] The next punch of the utility model includes a next punch pad, a next punch cover, and a next punch head. The cross-section of the next punch head is T-shaped. The lower end surface of the next punch cover is provided with an annular groove, and a perforation is provided at the bottom of the annular groove. The horizontal part of the T-shaped next punch head is arranged in the annular groove and is connected to the next punch pad through a rotating part. The vertical part of the T-shaped next punch head passes through the perforation and is inserted into the middle die. The next punch cover is fixed to the next punch pad by bolts. A cam hole is provided on the next punch pad, the next punch head, and the rotating part.

[0009] The second next punch of the utility model includes a second next punch pad, a second next punch cover, and a second next punch head. The cross-section of the second next punch head is T-shaped. The lower end surface of the second next punch cover is provided with an annular groove, and a perforation is provided at the bottom of the annular groove. The horizontal part of the T-shaped second next punch head is arranged in the annular groove and is connected to the second next punch pad through a rotating part. The vertical part of the T-shaped second next punch head passes through the cam hole and extends into the next punch head. The second next punch cover is fixed to the second next punch pad by bolts. A mandrel perforation is provided on the second next punch pad, the second next punch head, and the rotating part.

[0010] The mandrel of the utility model includes a mandrel pressure pad, a mandrel pressure cover, and a mandrel pressure head. The cross-section of the mandrel pressure head is T-shaped. The lower end surface of the mandrel pressure cover is provided with an annular groove, and a perforation is provided at the bottom of the annular groove. The horizontal part of the T-shaped mandrel pressure head is arranged in the annular groove and is connected to the mandrel pressure pad through a rotating part. The vertical part of the T-shaped mandrel pressure head passes through the perforation and is inserted into the mandrel perforation of the second next punch. The mandrel pressure cover is fixed to the mandrel pressure pad by bolts.

[0011] The rotating part of the utility model is a bearing or a spiral plate that can automatically rotate. The self-rotation of the upper punch head, the next punch head, the second next punch head, or the mandrel pressure head is realized through the bearing or the spiral plate.

[0012] The spiral plate of the utility model is provided with spiral grooves on its surface, and spiral blocks are provided on the groove surfaces of the spiral grooves. The spiral blocks are respectively connected to the end surfaces of the upper punch head, the lower punch head, or the mandrel pressure head. The rotation of the spiral blocks in the spiral grooves realizes the rotation of the upper punch head, the lower punch head, or the mandrel pressure head.

[0013] Due to the adoption of the above structure, the utility model has the advantages of simple structure, good forming effect, high forming efficiency, and cost saving. Description of the Drawings

[0014] Figure 1 is a schematic structural diagram of the utility model.

[0015] Figure 2 is a top view of the product formed by the utility model. Detailed Embodiment

[0016] The following further describes the utility model with reference to the drawings:

[0017] As shown in the attached drawings, an inclined gear forming die with a cam is provided with an upper punch, a middle die 1, a lower first punch, a lower second punch and a mandrel. It is characterized in that an inner helical tooth groove is provided on the inner wall of the middle die 1. The upper punch is arranged above the middle die 1. A jack 2 is provided on the lower end face of the upper punch. The lower first punch is arranged below the middle die 1. A cam hole 3 is provided in the axial direction of the lower first punch. The lower second punch is arranged in the cam hole 3. The lower second punch extends into the cam hole 3. A mandrel through hole is provided in the axial direction of the lower second punch. The mandrel passes through the mandrel through hole of the lower second punch and is inserted into the jack 2 of the upper punch. Outer helical tooth grooves are respectively provided on the outer walls of the upper punch and the lower first punch. A limiting protrusion 4 is provided on the inner wall of the cam hole of the lower first punch. A limiting key groove 5 that cooperates with the key groove of the lower first punch is provided on the outer wall of the lower second punch.

[0018] Furthermore, the upper punch includes an upper punch pad 6, an upper punch cover 7, and an upper punch head 8. The cross section of the upper punch head 8 is in a T shape. An annular groove is provided on the upper end face of the upper punch cover 7. A through hole is provided at the bottom of the annular groove. The horizontal part of the T-shaped upper punch head 8 is arranged in the annular groove and is connected to the upper punch pad 6 through a rotating part 9. The vertical part of the T-shaped upper punch head 8 passes through the through hole and is inserted into the middle die 1. The upper punch cover 7 is fixed to the upper punch pad 6 by bolts.

[0019] Furthermore, the lower first punch includes a lower first punch pad 10, a lower first punch cover 11, and a lower first punch head 12. The cross section of the lower first punch head 12 is in a T shape. An annular groove is provided on the lower end face of the lower first punch cover 11. A through hole is provided at the bottom of the annular groove. The horizontal part of the T-shaped lower first punch head 12 is arranged in the annular groove and is connected to the lower first punch pad 10 through a rotating part 9. The vertical part of the T-shaped lower first punch head 12 passes through the through hole and is inserted into the middle die 1. The lower first punch cover 11 is fixed to the lower first punch pad 10 by bolts. The cam hole 3 is provided on the lower first punch pad 10, the lower first punch head 12, and the rotating part 9.

[0020] Furthermore, the lower second punch includes a lower second punch pad 13, a lower second punch cover 14, and a lower second punch head 15. The cross section of the lower second punch head 15 is in a T shape. An annular groove is provided on the lower end face of the lower second punch cover 14. A through hole is provided at the bottom of the annular groove. The horizontal part of the T-shaped lower second punch head 15 is arranged in the annular groove and is connected to the lower second punch pad 13 through a rotating part 9. The vertical part of the T-shaped lower second punch head 15 passes through the cam hole 3 and extends into the lower first punch head 12. The lower second punch cover 14 is fixed to the lower second punch pad 13 by bolts. The mandrel through hole is provided on the lower second punch pad 13, the lower second punch head 15, and the rotating part 9.

[0021] Further, the mandrel includes a mandrel pressing pad 16, a mandrel pressing cover 17, and a mandrel pressing head 18. The cross-section of the mandrel pressing head 18 is T-shaped. An annular groove is provided on the lower end surface of the mandrel pressing cover 17, and a perforation is provided at the bottom of the annular groove. The horizontal portion of the T-shaped mandrel pressing head 18 is disposed in the annular groove and is connected to the mandrel pressing pad 16 through a rotating member 9. The vertical portion of the T-shaped mandrel pressing head 18 passes through the perforation and is inserted into the mandrel perforation of the lower second punch. The mandrel pressing cover 17 is fixed to the mandrel pressing pad 16 by bolts.

[0022] Further, the rotating member 9 is a bearing or a spiral piece capable of automatic rotation, and the rotation of the upper punch head 8, the lower first punch head 12, the lower second punch head 15, or the mandrel pressing head 18 is realized through the bearing or the spiral piece.

[0023] Further, spiral grooves are provided on the surface of the spiral piece, and spiral blocks are provided on the groove surface of the spiral grooves. The spiral blocks are respectively connected to the end surfaces of the upper punch head 8, the lower punch head, or the mandrel pressing head 18, and the rotation of the spiral blocks in the spiral grooves realizes the rotation of the upper punch head 8, the lower punch head, or the mandrel pressing head 18.

[0024] The above Figure 2 is the product structure, and a cam structure 19 is provided on the helical gear.

[0025] When the present utility model is in use, during the forming process, the upper punch head 8 rotates and moves downward simultaneously, the lower first punch head 12, the lower second punch head 15, and the mandrel pressing head 18 rotate and move upward simultaneously, the middle die 1 does not move, and a forming die cavity is formed between the lower end surface of the upper punch head 8, the upper end surface of the lower first punch head 12, the upper end surface of the lower second punch head 15, the outer wall of the mandrel, and the inner wall of the middle die 1. After pressing and forming, during the demolding process, the upper punch head 8 moves upward and rotates simultaneously, the lower first punch head moves upward and rotates, which will drive the lower second punch head 15 to move upward and rotate simultaneously, the product moves upward and rotates, and the mandrel pressing head is driven to rotate by the force of the product rotation, thereby ejecting the formed product. In this way, a cam structure can be directly provided on the side surface of the helical gear during the powder metallurgy forming process. Therefore, subsequent machining processes such as wire cutting can be saved, the forming quality is good, and the forming effect is good. Due to the adoption of the above structure, the present utility model has the advantages of simple structure, good forming effect, high forming efficiency, and cost saving.

Claims

1. A helical gear forming die with a cam, comprising an upper punch, a middle die, a lower punch, a lower second punch and a core rod, characterized in that The inner wall of the middle die is provided with inner oblique teeth, the upper punch is arranged above the middle die, the lower end face of the upper punch is provided with an insertion hole, the lower punch is arranged below the middle die, a cam hole is provided in the axial direction of the lower punch, a lower punch is provided in the cam hole, the lower punch extends into the cam hole, a core rod through hole is provided in the axial direction of the lower punch, the core rod passes through the core rod through hole of the lower punch and is inserted into the insertion hole of the upper punch, the outer wall of the upper punch and the outer wall of the lower punch are respectively provided with outer oblique teeth, a limiting protrusion is provided on the inner wall of the cam hole of the lower punch, and a limiting key slot matching with the key slot of the lower punch is provided on the outer wall of the lower punch.

2. A helical gear forming die with cam according to claim 1, characterized in that The upper punch includes an upper punch pad, an upper punch cover, and an upper punch head. The cross-section of the upper punch head is T-shaped. The upper end surface of the upper punch cover is provided with an annular groove, and the bottom of the annular groove is provided with a through hole. The transverse part of the T-shaped upper punch head is arranged in the annular groove and connected to the upper punch pad via a rotating part. The vertical part of the T-shaped upper punch head passes through the through hole and is inserted into the middle mold. The upper punch cover is fixed to the upper punch pad by bolts.

3. A helical gear forming die with cam according to claim 1, characterized in that The next punch includes a next punch pad, a next punch cover, and a next punch head. The cross-section of the next punch head is T-shaped. The lower end surface of the next punch cover is provided with an annular groove, and the bottom of the annular groove is provided with a through hole. The transverse part of the T-shaped next punch head is arranged in the annular groove and connected to the next punch pad through a rotating member. The vertical part of the T-shaped next punch head passes through the through hole and is inserted into the middle mold. The next punch cover is fixed to the next punch pad by bolts, and the cam hole is arranged on the next punch pad, the next punch head, and the rotating member.

4. A helical gear forming die with cam according to claim 1, characterized in that The lower two punches include lower two punch pads, lower two punch covers, and lower two punch heads. The cross-section of the lower two punch heads is T-shaped. The lower end surface of the lower two punch covers is provided with an annular groove, and the bottom of the annular groove is provided with a through hole. The transverse part of the T-shaped lower two punch heads is arranged in the annular groove and connected to the lower two punch pads through a rotating member. The vertical part of the T-shaped lower two punch heads passes through the cam hole and extends into the next punch head. The lower two punch covers are fixed to the lower two punch pads by bolts, and the core rod through holes are arranged on the lower two punch pads, the lower two punch heads, and the rotating member.

5. The helical gear forming die with cam according to claim 1, characterized in that The mandrel comprises a mandrel pressure pad, a mandrel pressure cover and a mandrel pressure head. The cross section of the mandrel pressure head is T-shaped. The lower end surface of the mandrel pressure cover is provided with an annular groove, and the bottom of the annular groove is provided with a through hole. The transverse part of the T-shaped mandrel pressure head is arranged in the annular groove and connected to the mandrel pressure pad via a rotating member. The vertical part of the T-shaped mandrel pressure head passes through the through hole and is inserted into the mandrel through hole of the lower second punch. The mandrel pressure cover is fixed to the mandrel pressure pad by bolts.

6. A helical gear forming die with cam according to claim 2, 3, 4 or 5, characterized in that The rotating part is a bearing or a spiral sheet that can rotate automatically, and the upper punch head, the lower punch head, the lower second punch head or the core rod punch head can rotate automatically through the bearing or the spiral sheet.

7. A helical gear forming die with cam according to claim 6, characterized in that The spiral sheet has a spiral groove on its surface, and a spiral block on its groove surface. The spiral blocks are respectively connected to the end faces of the upper punch head, the lower punch head or the core rod punch head. The spiral block rotates in the spiral groove to realize the rotation of the upper punch head, the lower punch head or the core rod punch head.

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