A helical gear production mold with symmetrical bosses

Abstract

This utility model relates to the field of powder metallurgy helical gear manufacturing technology, specifically a helical gear production mold with symmetrical bosses. The production mold includes an upper punch mold, a middle mold, a lower punch mold, a lower second punch mold, and a mandrel mold. The upper punch mold is located above the middle mold, and the lower punch mold, the lower second punch mold, and the mandrel mold are located below the middle mold in sequence. The upper punch mold includes an upper punch template and an upper punch head, the lower punch mold includes a lower punch template and a lower punch head, the lower second punch mold includes a lower second punch template and a lower second punch head, and the mandrel mold includes a mandrel template and a mandrel punch head. The outer walls of the upper punch head and the lower punch head are provided with external helical tooth grooves that cooperate with the helical gear formed by the middle mold. It has the advantages of simple structure, high forming efficiency, low processing cost, and good forming effect.

Description

Technical Field

[0001] This utility model relates to the field of powder metallurgy manufacturing of helical gears, specifically a helical gear production mold with symmetrical bosses. Background Technology

[0002] As is well known, powder metallurgy helical gears are a standard product in powder metallurgy parts, accounting for more than 30% of the total usage in the reciprocating saw industry, and their design directly affects product quality. Therefore, a reasonable design is crucial for service life.

[0003] Helical gears are used in harsh working conditions with high temperature and high speed. Wear resistance is the main factor affecting the life of reciprocating saws. The larger the helix angle of the helical gear, the better the durability of the reciprocating saw under the same conditions. From the perspective of helical gear manufacturing, the larger the helix angle, the lower the mold life and the higher the product manufacturing cost. At present, the processing method for the structure of helical gears with symmetrical bosses is to form symmetrical cylindrical structures on both sides of the helical gear body. The center of the helical gear has a central circular hole. To form the bosses of the symmetrical cam structure, the cylindrical structures on both sides need to be cut to form a symmetrical cam shape, which wastes a lot of material. Therefore, the processing cost increases and the processing efficiency is low. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a helical gear production mold with symmetrical bosses that has a simple structure, high molding efficiency, low processing cost, and good molding effect.

[0005] The technical solution adopted by this utility model to solve its technical problem is: A helical gear production mold with symmetrical bosses, characterized in that the production mold includes an upper punch mold, a middle mold, a lower punch mold, a lower second punch mold, and a mandrel mold. The upper punch mold is located above the middle mold, and the lower punch mold, lower second punch mold, and mandrel mold are sequentially located below the middle mold. The upper punch mold includes an upper punch template and an upper punch head, the upper punch template and the upper punch head being rotatably connected. The lower end face of the upper punch head has an upper forming cavity offset from the center, and the upper end face of the upper forming cavity has an upper mandrel insertion hole concentric with the upper punch head. The middle mold has a forming helical gear hole in its center. The lower punch mold includes a lower punch template and a lower punch head. The lower second punch mold includes a lower second punch template and a lower second punch head. The mandrel mold includes a mandrel template and a mandrel punch head. The lower punch template and the lower second punch mold are rotatably connected. A punch is rotatably connected, and a lower punch and a lower punch template are provided with a through-hole for the second punch. The second punch hole is arranged concentrically with the upper forming cavity. The lower punch template is rotatably connected with the second punch, and the second punch is inserted into the second punch hole. A lower mandrel hole is provided in the middle of the lower punch template and the second punch. The mandrel template is rotatably connected with the mandrel punch, and the mandrel punch is inserted through the lower mandrel hole and passes through the upper mandrel hole. A lower forming cavity is formed between the upper end face of the second punch and the second punch hole of the lower punch. After the upper punch, the lower punch, the second punch, and the mandrel punch are closed, a symmetrical boss helical gear forming cavity is formed between the lower forming cavity, the upper forming cavity, and the forming helical gear hole of the middle mold. The outer walls of the upper punch and the lower punch are provided with external helical gear grooves that cooperate with the forming helical gear of the middle mold.

[0006] The lower two punches of this invention have an upper limit boss on their outer wall and an upper limit groove on the inner wall of the lower two punch insertion hole of the lower punch. The upper limit boss of the lower two punches cooperates with the upper limit groove to limit the movement. When the lower punch rotates during demolding, it drives the lower two punches to rotate, thus preventing the boss of the formed cam structure from breaking hard.

[0007] The upper punch template and the upper punch head described in this utility model are connected by a first rotating component and an upper punch cover. The upper punch head is T-shaped, and the upper punch cover is provided with a T-shaped slot. After the upper punch cover passes through the upper punch head, it is fixedly connected to the upper punch template. The upper end of the upper punch head is rotatably connected to the lower end face of the upper punch template via the first rotating component.

[0008] The next punch template and the next punch head are connected by a second rotating component and a next punch cover in this utility model. The next punch head is T-shaped, and the next punch cover is provided with a T-shaped slot. After the next punch head passes through the next punch head, it is fixedly connected to the next punch template. The lower end of the next punch head is rotatably connected to the upper end face of the next punch template via the second rotating component.

[0009] The lower two-punch template and the lower two-punch head of this utility model are connected by a third rotating component and a lower two-punch pressure cover. The lower two-punch head is T-shaped, and the lower two-punch pressure cover is provided with a T-shaped slot. After passing through the lower two-punch head, the lower two-punch pressure cover is fixedly connected to the lower two-punch template. The lower end of the lower two-punch head is rotatably connected to the upper end face of the lower two-punch template via the third rotating component.

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

[0011] The first rotating component, second rotating component, third rotating component, and fourth rotating component described in this utility model are bearings or spiral plates capable of rotation.

[0012] The upper end face of the upper limit boss and the lower end face of the upper limit groove of the present invention are provided with a clearance after mold closing. The clearance ensures that the upper punch and the lower punch can move up and down relative to each other during demolding, thus ensuring the product can be ejected.

[0013] This utility model, due to the above-mentioned structure, has the advantages of simple structure, high molding efficiency, low processing cost, and good molding effect. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the product structure produced by the mold of this utility model.

[0016] Figure 3 yes Figure 2 A sectional view. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings: As shown in the attached figure, a helical gear production mold with symmetrical bosses is characterized in that the production mold includes an upper punch mold, a middle mold 15, a lower punch mold, a lower second punch mold, and a mandrel mold. The upper punch mold is located above the middle mold 15, and the lower punch mold, lower second punch mold, and mandrel mold are sequentially located below the middle mold 15. The upper punch mold includes an upper punch template 1 and an upper punch head 2, which are rotatably connected. The lower end face of the upper punch head 2 has an upper forming cavity 3 offset from the center, and the upper end face of the upper forming cavity 3 has an upper mandrel insertion hole 4 concentric with the upper punch head 2. The middle mold has a forming helical gear hole 5 in the middle. The lower punch mold includes a lower punch template 6 and a lower punch head 7. The lower second punch mold includes a lower second punch template 8 and a lower second punch head 9. The mandrel mold includes a mandrel template 10 and a mandrel punch 11. The lower punch template 6 and the lower punch head 7 are rotatably connected. The lower punch 7 and the lower punch template 6 are provided with through holes 12 for the lower second punch. The holes 12 for the lower second punch are arranged concentrically with the upper forming cavity 3. The lower second punch template 8 is rotatably connected to the lower second punch 9. The lower second punch 9 is inserted into the holes 12 for the lower second punch. The lower second punch template 8 and the lower second punch 9 are provided with holes 13 for the lower mandrel. The mandrel template 10 is rotatably connected to the mandrel punch 11. The mandrel punch 11 is inserted and penetrates through the holes 13 for the lower mandrel. Inside the upper mandrel insertion hole 4, the upper end face of the lower second punch 9 and the lower second punch insertion hole of the lower punch 7 form a lower forming cavity 14. After the upper punch 2, the lower punch 7, the lower second punch 9, and the mandrel punch 11 are closed, a symmetrical boss helical gear forming cavity is formed between the lower forming cavity 14, the upper forming cavity 3 and the forming helical gear hole 5 of the middle mold 15. The outer walls of the upper punch 2 and the lower punch 7 are provided with external helical gear grooves 16 that cooperate with the forming helical gear of the middle mold 15.

[0018] Furthermore, the lower second punch 9 has an upper limit boss 17 on its outer wall, and the lower second punch insertion hole 12 of the lower second punch 7 has an upper limit groove 18 on its inner wall. The upper limit boss 17 of the lower second punch 9 cooperates with the upper limit groove 18 to limit the movement. When the lower punch 7 rotates during demolding, it drives the lower second punch 9 to rotate, thus preventing the boss of the formed cam structure from breaking hard.

[0019] Furthermore, the upper punch template 1 and the upper punch head 2 are connected by a first rotating member 19 and an upper punch cover 20. The upper punch head 2 is T-shaped, and the upper punch cover 20 is provided with a T-shaped slot. The upper punch cover 20 passes through the upper punch head 2 and is fixedly connected to the upper punch template 1. The upper end of the upper punch head 2 is rotatably connected to the lower end face of the upper punch template 1 via the first rotating member 19.

[0020] Furthermore, the next punch template 6 and the next punch 7 are connected by the second rotating member 21 and the next punch cover 22. The next punch 7 is T-shaped, and the next punch cover 22 is provided with a T-shaped slot. The next punch cover 22 passes through the next punch 7 and is fixedly connected to the next punch template 6. The lower end of the next punch 7 is rotatably connected to the upper end face of the next punch template 6 via the second rotating member 21.

[0021] Furthermore, the lower second punch template 8 and the lower second punch 9 are connected by a third rotating component 23 and a lower second punch cover 24. The lower second punch 9 is T-shaped, and the lower second punch cover 24 is provided with a T-shaped slot. The lower second punch cover 24 passes through the lower second punch 9 and is fixedly connected to the lower second punch template 8. The lower end of the lower second punch 9 is rotatably connected to the upper end face of the lower second punch template 8 via the third rotating component 23.

[0022] Furthermore, the mandrel template 10 and the mandrel punch 11 are connected by a fourth rotating member 25 and a mandrel cover 26. The mandrel punch 11 is T-shaped, and the mandrel cover 26 is provided with a T-shaped slot. The mandrel cover 26 passes through the mandrel punch 11 and is fixedly connected to the mandrel template 10. The lower end of the mandrel punch 11 is rotatably connected to the upper end face of the mandrel template 10 via the fourth rotating member 25.

[0023] Furthermore, the first rotating component 19, the second rotating component 21, the third rotating component 23, and the fourth rotating component 25 are bearings or spiral plates capable of rotation.

[0024] Furthermore, after mold closing, a clearance 27 is provided between the upper end face of the upper limit boss 17 and the lower end face of the upper limit groove 18. The clearance 27 ensures that the upper punch 7 and the lower punch 9 can move up and down relative to each other during demolding, thus ensuring the product can be ejected.

[0025] The aforementioned T-shaped slots are respectively engaged with the upper punch, lower punch, lower second punch, and mandrel punch of the T-shape.

[0026] In use, the middle mold 15 is fixed on the machine base. The mandrel template 10, the lower punch template 6, the lower second punch template 8, and the upper punch template 1 are respectively fixed to the output arm end of the machine base. The mandrel punch 11, the lower punch 7, and the lower second punch 9 are inserted into the forming oblique tooth hole 5 of the middle mold 15 under the action of the output arm. Then, powder is filled into the forming oblique tooth hole 5 of the middle mold 15. The upper punch template 1 moves downward under the action of the machine base output arm, and the upper end of the mandrel punch 11 is inserted into the upper mandrel insert. Inside hole 4, powder is pressed within the upper forming cavity 3, lower forming cavity 14, and the forming oblique tooth hole 5 of the middle mold 15, thus forming an oblique gear with symmetrical bosses. The demolding process involves the upper punch plate 1 driving the upper punch 2 upwards, the upper punch 2 rotating and exiting above the middle mold 15. The next punch 7, the second punch 9, and the mandrel punch 11 move upwards and rotate under the action of the next punch plate 6, the second punch plate 8, and the mandrel plate 10. After the product exits the middle mold, the next punch plate 6 drives the next punch... The head 7 moves upward, and the lower second punch 9 and the mandrel punch 11 rotate under the action of friction. The next punch 7 ejects the formed product, thus completing the demolding process. Alternatively, the middle mold and the mandrel template drive the mandrel punch downward (during this process, the mold can be moved under the action of the machine). During the downward movement, the next punch drives the lower second punch to rotate, and then the next punch also moves downward. The formed product is directly a helical gear with symmetrical bosses. The bosses of the cam structure on both sides of the helical gear body do not need to be cut, saving a lot of material. At the same time, the processing cost is low, the forming effect is good, and the forming efficiency is high. The structure of the helical gear with symmetrical bosses prepared by the above scheme is the symmetrical forming cam structure bosses 29 on both sides of the helical gear body 28. The helical gear body 28 and the bosses 29 have a central circular hole 30 centered on the helical gear body. They are integrally formed. Due to the above structure, this utility model has the advantages of simple structure, high forming efficiency, low processing cost, and good forming effect.

Claims

1. A helical gear manufacturing mold with symmetrical bosses, characterized in that... The production mold includes an upper punch mold, a middle mold, a lower punch mold, a lower second punch mold, and a mandrel mold. The upper punch mold is located above the middle mold, and the lower punch mold, lower second punch mold, and mandrel mold are sequentially located below the middle mold. The upper punch mold includes an upper punch template and an upper punch head. The upper punch template is rotatably connected to the upper punch head. The lower end face of the upper punch head has an upper forming cavity offset from the center, and the upper end face of the upper forming cavity has an upper mandrel insertion hole concentric with the upper punch head. The middle mold has a forming oblique tooth hole in the middle. The lower punch mold includes a lower punch template and a lower punch head. The lower second punch mold includes a lower second punch template and a lower second punch head. The mandrel mold includes a mandrel template and a mandrel punch head. The lower punch template and the lower punch head are rotatably connected. The upper punch and the next punch template are provided with through holes for the lower two punches. The holes for the lower two punches are arranged concentrically with the upper forming cavity. The lower two punch template is rotatably connected to the lower two punches. The lower two punches are inserted into the holes for the lower two punches. The lower two punch template and the lower two punches are provided with holes for the lower mandrel. The mandrel template is rotatably connected to the mandrel punch. The mandrel punch is inserted through the holes for the lower mandrel and passes through the holes for the upper mandrel. The upper end face of the lower two punches and the holes for the lower two punches of the next punch form the lower forming cavity. After the upper punch, the next punch, the lower two punches, and the mandrel punches are closed, the lower forming cavity, the upper forming cavity and the forming helical gear forming cavity of the middle mold are formed between them. The outer walls of the upper punch and the next punch are provided with external helical gear grooves that cooperate with the forming helical gear of the middle mold.

2. The helical gear production mold with symmetrical bosses according to claim 1, characterized in that... The lower two punches are provided with an upper limit boss on their outer wall and an upper limit groove on the inner wall of the lower two punch insertion hole of the lower punch. The upper limit boss of the lower two punches cooperates with the upper limit groove to limit the movement. When the lower punch rotates during demolding, it drives the lower two punches to rotate, thus preventing the boss of the formed cam structure from breaking hard.

3. A helical gear production mold with symmetrical bosses according to claim 1, characterized in that... The upper punch template and the upper punch head are connected by a first rotating component and an upper punch cover. The upper punch head is T-shaped, and the upper punch cover is provided with a T-shaped slot. The upper punch cover passes through the upper punch head and is fixedly connected to the upper punch template. The upper end of the upper punch head is rotatably connected to the lower end face of the upper punch template via the first rotating component.

4. A helical gear production mold with symmetrical bosses according to claim 1, characterized in that... The next punch template and the next punch are connected by a second rotating component and a next punch cover. The next punch is T-shaped, and the next punch cover has a T-shaped slot. The next punch cover passes through the next punch and is fixedly connected to the next punch template. The lower end of the next punch is rotatably connected to the upper surface of the next punch template via the second rotating component.

5. A helical gear production mold with symmetrical bosses according to claim 1, characterized in that... The lower two-punch template and the lower two-punch head are connected by a third rotating component and a lower two-punch pressure cover. The lower two-punch head is T-shaped, and the lower two-punch pressure cover has a T-shaped slot. After passing through the lower two-punch head, the lower two-punch pressure cover is fixedly connected to the lower two-punch template. The lower end of the lower two-punch head is rotatably connected to the upper end face of the lower two-punch template via the third rotating component.

6. A helical gear production mold with symmetrical bosses according to claim 1, characterized in that... The mandrel template and the mandrel punch are connected by a fourth rotating component and a mandrel cover. The mandrel punch is T-shaped, and the mandrel cover has a T-shaped slot. After passing through the mandrel punch, the mandrel cover is fixedly connected to the mandrel template. The lower end of the mandrel punch is rotatably connected to the upper end face of the mandrel template via the fourth rotating component.

7. A helical gear production mold with symmetrical bosses according to claim 2, characterized in that... The upper end face of the upper limit boss and the lower end face of the upper limit groove are provided with a clearance after mold closing. The clearance ensures that the upper punch and the lower punch can move up and down relative to each other during demolding, thus ensuring the product can be ejected.

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