An inner hole reverse rolling die

Abstract

The present application relates to the field of mould, disclose a kind of inner hole reverse roll mould, it includes upper die body, reverse roll female die, lower die body, reverse roll male die, reverse roll retainer and first spring.Reverse roll female die is fixed on upper die body.Reverse roll female die lower end face is close to the inclined surface groove and upper circular arc groove corresponding to the upper end surface of product at avoiding hole place.Reverse roll male die is fixed on lower die body.Reverse roll male die is provided with a convex edge, and the upper end surface of convex edge and the upper side surface of reverse roll male die are circularly transitioned.Reverse roll retainer is movably sleeved on reverse roll male die, and the inner wall of reverse roll retainer, the upper end surface of convex edge and the upper side surface of reverse roll male die form lower circular arc groove corresponding to the inner roll circle lower end of product.First spring one end is connected with lower die body, and the other end is connected with reverse roll retainer.The present application sets forming structure on lower die, not only high forming precision, but also can perfectly protect original structure, avoid extrusion deformation.

Description

Technical Field

[0001] This invention relates to the field of molds, and in particular to an internal hole reverse rolling mold. Background Technology

[0002] Vacuum circuit breakers are named for their high-vacuum arc-extinguishing medium and the insulating medium in the contact gap after arc extinguishing. They are widely used in power distribution networks due to their advantages of small size, light weight, suitability for frequent operation, and maintenance-free arc extinguishing. The main shielding surrounding the contacts is an indispensable component of the vacuum interrupter. The main shielding serves the following purposes: a) preventing arc products from splashing onto the inner wall of the insulating shell during arc extinguishing, thus reducing the insulation strength of the shell; b) improving the uniformity of the electric field distribution inside the interrupter, which helps reduce local field strength and promotes miniaturization of the vacuum interrupter; c) condensing arc products, absorbing some of the arc energy, and aiding in the recovery of the dielectric strength of the post-arc gap.

[0003] The shielding cover is mainly formed by stamping with a stamping die, and an inwardly rolled circle needs to be set in the middle of the upper end of the shielding cover. The existing processing method is to place the shielding cover to be processed on the lower die, and then bend and extrude the inner hole of the shielding cover through the die core of the upper die to form it. Although the existing method can achieve the inwardly rolled circle structure, its forming accuracy is low, and when there are inclined surfaces on the shielding cover, the inclined surfaces are easily deformed by extrusion. The dimensional accuracy of the inwardly rolled circle has a significant impact on the uniformity of the electric field and the reduction of the field strength. Therefore, for shielding covers with high precision requirements, the existing processing method cannot meet the requirements. Summary of the Invention

[0004] The purpose of this invention is to solve the problem that existing processing molds have low dimensional accuracy in the reverse rolling of the inner hole of the shielding cover, and are prone to extrusion deformation of the shielding cover. The invention provides an inner hole reverse rolling mold, which sets the forming structure on the lower mold, which not only has high forming accuracy, but also can completely protect the original structure and avoid extrusion deformation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: This invention discloses an internal hole reverse rolling mold, which includes an upper mold body, a reverse rolling die, a lower mold body, a reverse rolling punch, a reverse rolling guard ring, and a first spring.

[0006] The anti-rolling die is fixed to the upper die body; the anti-rolling die has a clearance through hole in the middle, and the lower end face of the anti-rolling die has a bevel groove and an upper arc groove corresponding to the upper end face of the product near the clearance hole.

[0007] The lower mold body cooperates with the upper mold body.

[0008] The anti-rolling punch is fixed on the lower die body. The anti-rolling punch has a raised edge, and the upper end face of the raised edge is arc-shaped to the upper side face of the anti-rolling punch. The upper diameter of the anti-rolling punch is the same as the size of the upper hole of the product. The anti-roll guard ring is movably fitted onto the anti-roll punch. The inner wall of the anti-roll guard ring, the upper end face of the protrusion, and the upper side of the anti-roll punch form a lower arc groove corresponding to the lower end of the inner roll circle of the product. The upper end face of the anti-roll guard ring corresponds to the upper inner wall of the product. The first spring has one end connected to the lower mold body and the other end connected to the anti-coil guard ring.

[0009] Furthermore, it also includes a lower ejector plate, a second spring, and a push rod; the lower ejector plate is movably sleeved on the anti-roll guard ring, one end of the second spring is connected to the lower mold body, and the other end is connected to the lower ejector plate; one end of the push rod is fixed to the upper mold body, and the other end abuts against the lower ejector plate, used to push the lower ejector plate to move downward.

[0010] Furthermore, the upper mold body includes an upper support plate, an upper mold base, an upper pad plate, and an upper clamping plate that are fixedly connected in sequence; the anti-rolling die is embedded in the upper clamping plate, and its upper end face is fixed to the upper pad plate.

[0011] Furthermore, the lower mold body includes a lower support plate, a lower mold base, a lower pad plate, and a lower clamping plate that are fixedly connected in sequence. The anti-rolling punch is embedded in the lower clamping plate, and its lower end face is fixedly connected to the lower pad plate.

[0012] Furthermore, the upper and lower support plates are provided with fixing holes for fixing to external devices.

[0013] Furthermore, the lower end of the inner guide post is provided with several oil storage tanks.

[0014] Furthermore, the upper mold base is provided with a number of outer guide pillars, and the lower mold base is provided with a number of outer guide pillar sleeves that cooperate with the outer guide pillars.

[0015] Furthermore, a wear-resistant sleeve is provided at the lower end of the outer guide post.

[0016] Furthermore, threaded lifting holes for fixing to the lifting ring are provided on the sides of the upper and lower mold bases.

[0017] The advantages of this invention are: This invention designs the forming contour component of the mold on the lower mold. A lower arc groove is formed by a reverse-rolling punch and a reverse-rolling retainer. The reverse-rolling punch is fixed, while the reverse-rolling retainer is movable. Under the pressure of the upper mold's reverse-rolling die, the reverse-rolling retainer moves downwards with the product. During operation, the inner hole extension of the product to be rolled is placed into the lower arc groove. When the inner hole extension reaches the flange, it is rolled inwards along the shape of the lower arc groove under pressure. Because the upper arc groove corresponds to the upper contour of the product, and the upper surface of the reverse-rolling retainer corresponds to the upper inner wall of the product, the risk of product deformation during processing is avoided. This provides better protection, especially for products with a beveled upper surface, and has wider applicability. Simultaneously, the inner hole extension is rolled inwards under the constraint of the lower arc groove during the downward pressing process, resulting in higher precision compared to existing methods of direct stamping and bending by the upper mold. The precision of this invention can reach [a certain level]. The tolerance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the structure during mold opening of the present invention.

[0020] Figure 3 This is a diagram showing the state when the push rod of the present invention contacts the lower release plate.

[0021] Figure 4 This is a diagram showing the state of the shielding cover of the present invention when it comes into contact with the anti-rolling protective ring.

[0022] Figure 5 This is a diagram showing the state of the mold after it has been fully closed according to the present invention.

[0023] Figure 6 This is a schematic diagram of the structure of the reverse-rolling die.

[0024] Figure 7 This is a schematic diagram of the structure of the anti-roll sheath.

[0025] Figure 8 This is a schematic diagram of the structure of the anti-rolling punch.

[0026] Figure 9 This is a schematic diagram of the shielding cover before it is rolled inward.

[0027] Figure 10 This is a schematic diagram of the structure after the shielding cover is rolled inward.

[0028] Explanation of key component symbols: 1. Upper mold body; 11. Upper support plate; 12. Upper mold base; 13. Upper pad plate; 14. Upper clamping plate; 15. Inner guide post; 16. Oil reservoir; 17. Outer guide post; 18. Wear-resistant sleeve; 19. Fixing hole. 2. Reverse rolling die; 21. Clearance through hole; 22. Angled groove; 23. Upper arc groove; 3. Lower mold body; 31. Lower support plate; 32. Lower mold base; 33. Lower pad plate; 34. Lower clamping plate; 35. Inner guide post sleeve; 36. Outer guide post sleeve; 37. Threaded lifting hole. 4. Reverse rolling punch; 41. Protruding edge; 42. Lower arc groove; 5. Reverse-coil retaining ring; 51. First spring; 6. Lower release plate; 61. Second spring; 7. Top rod; 8. Shielding cover; 81. Cover body; 82. Inner hole; 83. Extension section. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 9 , Figure 10 As shown, the product to be reverse-rolled in this embodiment is a shield 8 of a vacuum circuit breaker, which includes a cover body 81. The upper end of the cover body 81 is provided with an inner hole 82. There is an extension section 83 before inward rolling. An inclined surface is provided between the inner hole 82 and the side.

[0031] like Figures 1 to 10 As shown, the present invention discloses an internal hole reverse rolling mold, which includes an upper mold body 1, a reverse rolling concave mold 2, a lower mold body 3, a reverse rolling convex mold 4, a reverse rolling guard ring 5, and a first spring 51.

[0032] The anti-rolling die 2 is fixed to the upper die body 1. The anti-rolling die 2 has a clearance through hole 21 in the middle, and the lower end face of the anti-rolling die 2 has a beveled groove 22 and an upper arc groove 23 corresponding to the upper end face of the product near the clearance through hole 21.

[0033] The anti-rolling punch 4 is fixed to the lower die body 3. The anti-rolling punch 4 has a raised edge 41, and the upper end face of the raised edge 41 is arc-shaped to the upper side face of the anti-rolling punch 4. The upper diameter of the anti-rolling punch 4 is the same as the size of the upper hole of the product.

[0034] The anti-roll guard ring 5 is movably fitted onto the anti-roll punch 4. One end of the first spring 51 is connected to the lower die body 3, and the other end is connected to the anti-roll guard ring 5. The inner wall of the anti-roll guard ring 5, the upper end face of the flange 41, and the upper side surface of the anti-roll punch 4 form a lower arc groove 42 corresponding to the lower end of the inwardly rolled circle of the product. The upper end face of the anti-roll guard ring 5 corresponds to the upper inner wall of the product.

[0035] This invention designs the forming contour component of the mold on the lower mold. A lower arc groove 42 is formed by a reverse-rolling punch 4 and a reverse-rolling retaining ring 5. The reverse-rolling punch 4 is fixedly set, while the reverse-rolling retaining ring 5 is movable. Under the pressure of the upper mold's reverse-rolling die 2, the reverse-rolling retaining ring 5 moves downwards with the product. During operation, the extension 83 of the inner hole 82 of the product to be rolled is placed into the lower arc groove 42. When the extension 83 of the inner hole 82 of the product to be rolled abuts the flange 41, it is rolled inwards along the shape of the lower arc groove 42 under pressure. Since the upper arc groove 23 corresponds to the upper contour of the product, and the upper end face of the reverse-rolling retaining ring 5 corresponds to the upper inner wall of the product, the risk of product deformation due to compression during processing is avoided. This provides better protection, especially for products with a sloping upper end face, and has higher applicability. Simultaneously, during the downward pressing process, the extension 83 of the inner hole is rolled inwards under the constraint of the lower arc groove 42, resulting in higher precision compared to existing methods that directly punch and bend the product from the upper mold. The precision tolerance achievable by this invention is [insert tolerance here].

[0036] Specifically, the upper mold body 1 includes an upper support plate 11, an upper mold base 12, an upper pad plate 13, and an upper clamping plate 14, which are fixedly connected in sequence. The anti-rolling die 2 is embedded in the upper clamping plate 14, and its upper end face is fixed to the upper pad plate 13.

[0037] The lower mold body 3 includes a lower support plate 31, a lower mold base 32, a lower pad plate 33 and a lower clamping plate 34 that are fixedly connected in sequence. The anti-rolling punch 4 is embedded in the lower clamping plate 34 and its lower end face is fixedly connected to the lower pad plate 33.

[0038] The upper support plate 11 and the lower support plate 31 are provided with fixing holes 19 for fixing to external equipment.

[0039] The upper clamping plate 14 is provided with several inner guide posts 15, and the lower clamping plate 34 is provided with several inner guide post sleeves 35 that cooperate with the inner guide posts 15. The lower end of the inner guide post 15 is provided with several oil reservoirs 16 to increase lubrication between it and the inner guide post sleeves 35.

[0040] The upper mold base 12 is provided with several outer guide pillars 17, and the lower mold base 32 is provided with several outer guide pillar sleeves 36 that cooperate with the outer guide pillars 17. The lower end of the outer guide pillars 17 is provided with a wear-resistant sleeve 18.

[0041] The upper mold base 12 and the lower mold base 32 are provided with threaded lifting holes 37 for fixing with lifting rings on their sides.

[0042] To ensure more stable product placement and better demolding, the inner hole 82 reverse rolling mold also includes a lower ejector plate 6, a second spring 61, and a push rod 7. The lower ejector plate 6 is movably fitted onto the reverse rolling guard ring 5. One end of the second spring 61 is connected to the lower mold body 3, and the other end is connected to the lower ejector plate 6. One end of the push rod 7 is fixed to the upper mold body 1, and the other end abuts against the lower ejector plate 6, used to push the lower ejector plate 6 downward.

[0043] During stamping, place the product on the lower stripper plate 6 (e.g.) Figure 2 As shown), the upper mold moves downwards, and when the ejector pin 7 abuts against the lower ejector plate 6, the upper arc groove 23 of the reverse-rolling die 2 fits against the upper end of the product (as shown). Figure 3 As shown), the lower release plate 6 and the product move downwards, and when the inner wall of the product is in contact with the upper end of the anti-roll guard ring 5 (as shown), Figure 4 As shown), the anti-roll guard ring 5 also moves downwards under pressure until the extension 83 of the inner hole 82 of the product abuts against the protruding edge 41 of the anti-roll punch 4. As the upper die continues to move, the product is anti-rolled along the contour of the lower arc groove 42 under pressure (as shown). Figure 5 As shown), when the anti-roll guard ring 5 reaches the travel stroke, the anti-rolling of the inner hole 82 of the product is also completed.

[0044] In summary, the present invention sets the molding structure on the lower mold, which not only ensures high molding accuracy but also effectively protects the original structure and avoids extrusion deformation.

[0045] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. An internal hole reverse rolling die, characterized in that: include Upper mold body; A reverse-rolling die is fixed to the upper die body; the reverse-rolling die has a clearance through hole in the middle, and the lower end face of the reverse-rolling die has a sloping groove and an upper arc groove corresponding to the upper end face of the product near the clearance hole. The lower mold body mates with the upper mold body; A reverse-rolling punch is fixed on the lower die body. The reverse-rolling punch has a raised edge, and the upper end face of the raised edge transitions with the upper side face of the reverse-rolling punch by an arc. The upper diameter of the reverse-rolling punch is the same as the size of the upper hole of the product. The anti-roll guard ring is movably fitted onto the anti-roll punch. The inner wall of the anti-roll guard ring, the upper end face of the protrusion, and the upper side of the anti-roll punch form a lower arc groove corresponding to the lower end of the inner roll circle of the product. The upper end face of the anti-roll guard ring corresponds to the upper inner wall of the product. The first spring has one end connected to the lower mold body and the other end connected to the anti-roll guard ring.

2. The internal hole rewinding die according to claim 1, characterized in that: It also includes a lower ejector plate, a second spring, and a push rod; the lower ejector plate is movably sleeved on the anti-roll guard ring, one end of the second spring is connected to the lower mold body, and the other end is connected to the lower ejector plate; one end of the push rod is fixed to the upper mold body, and the other end abuts against the lower ejector plate, used to push the lower ejector plate to move downward.

3. The internal hole rewinding die according to claim 1, characterized in that: The upper mold body includes an upper support plate, an upper mold base, an upper pad plate, and an upper clamping plate that are fixedly connected in sequence; the anti-rolling die is embedded in the upper clamping plate, and its upper end face is fixed to the upper pad plate.

4. The internal hole rewinding die according to claim 3, characterized in that: The lower mold body includes a lower support plate, a lower mold base, a lower pad plate, and a lower clamping plate that are fixedly connected in sequence. The anti-rolling punch is embedded in the lower clamping plate, and its lower end face is fixedly connected to the lower pad plate.

5. The internal hole rewinding die according to claim 4, characterized in that: The upper and lower support plates are provided with fixing holes for fixing to external equipment.

6. The internal hole rewinding die according to claim 4, characterized in that: The upper clamping plate is provided with a number of inner guide posts, and the lower clamping plate is provided with a number of inner guide post sleeves that cooperate with the inner guide posts.

7. The internal hole rewinding die according to claim 6, characterized in that: The lower end of the inner guide post is provided with several oil storage tanks.

8. The internal hole rewinding die according to claim 4, characterized in that: The upper mold base is provided with several outer guide pillars, and the lower mold base is provided with several outer guide pillar sleeves that cooperate with the outer guide pillars.

9. The internal hole rewinding die according to claim 8, characterized in that: A wear-resistant sleeve is provided at the lower end of the outer guide post.

10. The internal hole rewinding die according to claim 4, characterized in that: The upper and lower mold bases are provided with threaded lifting holes on their sides for fixing to the lifting ring.

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