Drawing die

Abstract

The utility model discloses a drawing die which comprises a die body, the die body comprises a first die set and a second die set, and the first die set and the second die set are oppositely arranged and can move close to or away from the second die set. A male die head is arranged at the bottom of the first die set; the top of the second die set is provided with a forming protrusion and a female die cavity, the forming protrusion is used for installing a workpiece, the female die cavity extends in the circumferential direction of the forming protrusion and is opposite to the male die head, and the male die head is used for applying pressure to the workpiece when the first die set moves close to the second die set and extends into the female die cavity so that the workpiece can be stretched along the cavity wall of the female die cavity. A curled edge is formed; and the driving assembly is used for driving the first module to move close to the second module. When the die is used for stretching a workpiece, the edge of the workpiece can be turned synchronously, secondary machining of the workpiece is not needed, machining procedures are reduced, and production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a mould technical field especially relates to a stretch mould. BACKGROUND

[0002] The stretch mould is a kind of mould for the forming of metal or non-metal material, it mainly changes the blank of flat plate into the part with certain depth hollow or open shape through the stretch process. The edge of workpiece cannot be carried out edge curling operation synchronously after the workpiece is shaped by the existing stretch mould, when the workpiece with edge curling is needed to be produced, the workpiece after shaping needs secondary processing, makes it to have edge curling, resulting in low production efficiency. SUMMARY

[0003] In order to overcome at least one of the defects described in the prior art, the utility model provides a kind of stretch mould, the edge of workpiece can be curled simultaneously in the process of stretching workpiece by the mould, without secondary processing to workpiece, reduce processing procedure, improve production efficiency.

[0004] The utility model discloses a kind of stretch moulds, which are used to solve the problems thereof, and the technical scheme adopted by the utility model is as follows:

[0005] A stretch mould, comprising:

[0006] A mould body, the mould body includes a first die set and a second die set, the first die set and the second die set are oppositely arranged and can move close to or away from the second die set; the bottom of the first die set has a punch head; the top of the second die set has a forming protrusion and a die cavity, the forming protrusion is used to mount a workpiece, the die cavity extends along the circumference of the forming protrusion and is oppositely arranged with the punch head, the punch head is used to press the workpiece when the first die set moves close to the second die set, and the punch head extends into the die cavity to make the workpiece stretch along the cavity wall of the die cavity and form an edge curling;

[0007] A drive assembly is used to drive the first die set to move close to the second die set.

[0008] Further, the first die set includes a push plate, the punch head includes a connecting ring and a flange ring, the connecting ring is connected with the push plate, the flange ring is detachably connected with the connecting ring, and the flange ring is used to extend into the die cavity when the push plate moves close to the die cavity; the drive assembly is used to drive the push plate to move close to or away from the second die set.

[0009] Further, a first through hole is provided on the connecting ring, a second through hole is provided on the flange ring, and the first through hole and the second through hole are used to connect a connecting piece.

[0010] Further, the edge of the blank holder has a first circular arc guide surface extending along the circumference of the connecting ring.

[0011] Further, the push plate is provided with a first mounting hole for connecting a connecting member.

[0012] Further, the second mold set comprises a mounting plate, the forming protrusion is arranged on the top of the mounting plate, the mounting plate is provided with a connecting protrusion, the connecting protrusion is arranged at intervals with the forming protrusion and surrounds the outer periphery of the forming protrusion, so that the mounting plate is formed with the die cavity.

[0013] Further, the forming protrusion has a second circular arc guide surface extending along the circumference of the forming protrusion.

[0014] Further, the forming protrusion comprises a mounting table and a mounting ring, the mounting table is connected with the mounting plate, the mounting ring is located at the top end of the mounting table and is detachably connected with the mounting ring; the second circular arc guide surface is arranged on the mounting ring.

[0015] Further, the mounting table is provided with a third through hole, the mounting ring is provided with a fourth through hole, and the third through hole and the fourth through hole are used for connecting a connecting member.

[0016] Further, the mounting plate is provided with a plurality of second mounting holes for connecting a connecting member.

[0017] In summary, the stretch die has the following technical effects: when the die is used, the first mold set is driven by the driving assembly to move close to the second mold set, the punch head is driven to move towards the workpiece on the forming protrusion, and the workpiece is pressed, at this time, the center part of the workpiece is pushed by the punch to the inside of the die cavity, and at the same time, the material of the edge part will also be displaced, so that the workpiece changes from a flat state to a three-dimensional shape of the die cavity, so that the material of the edge part of the workpiece has a tendency to curl inward during the stretching process, so that the edge part of the workpiece is formed with a curled edge at the same time after forming, and the curled edge of the workpiece does not need to be processed again, the processing procedure is reduced, and the production efficiency is indirectly improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 It is a structural schematic diagram of the utility model;

[0019] Fig. 2 It is one perspective exploded view of the utility model;

[0020] Fig. 3 It is another perspective exploded view of the utility model.

[0021] Wherein, the reference signs have the following meanings:

[0022] 10, first module; 11, punch head; 111, edge ring; 112, connecting ring; 12, push plate; 20, second module; 21, forming protrusion; 211, mounting table; 212, mounting ring; 213, second arc guide surface; 22, die cavity; 23, mounting plate; 231, connecting protrusion. DETAILED DESCRIPTION

[0023] In order to better understand and implement, the technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model.

[0024] In the description of the utility model, it needs to be explained that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used in the specification of the utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the utility model.

[0026] Referring to Figs. 1 to 3 The utility model discloses a stretching die, including die main part and drive assembly, die main part includes first module 10 and second module 20, first module 10 is opposite to the arrangement of second module 20, drive assembly is used to drive first module 10 to move close to or away from second module 20;The bottom of first module 10 has punch head 11, and the top of second module 20 has forming protrusion 21 and die cavity 22, forming protrusion 21 is used to install workpiece, and die cavity 22 extends along the circumference of forming protrusion 21 and is opposite to the arrangement of punch head 11, punch head 11 exerts pressure on workpiece when first module 10 moves close to second module 20, and extends into die cavity 22, so that workpiece is stretched along the cavity wall of die cavity 22, and has the edge curling of forming.

[0027] On the basis of the above structure, when the mold body is in the initial state, the first mold set 10 and the second mold set 20 are arranged in an upper and lower spaced manner and form a processing interval, the male die head 11 is arranged opposite to the female die cavity 22, and the forming protrusion 21 is located at the axial position of the female die cavity 22. When the workpiece needs to be processed, the workpiece blank is placed on the forming protrusion 21, and the male die head 11 is aligned with the part of the workpiece that needs to be processed. At this time, the workpiece is in a flat plate state. In order to make the edge of the workpiece be formed with a hem after being stretched and formed, the outer diameter size of the workpiece blank needs to be greater than the outer diameter size of the female die cavity 22, so that the edge of the workpiece protrudes from the edge of the female die cavity 22.

[0028] When processing, the driving assembly drives the first mold set 10 to move close to the second mold set 20, so as to drive the male die head 11 to move downward toward the female die cavity 22. When the male die head 11 gradually applies pressure to the flat plate of the workpiece on the forming protrusion 21, at this time, the male die head 11 slides downward along the periphery of the forming protrusion 21, and forces the workpiece to deform according to the shape of the forming protrusion 21 and the external force, so that the workpiece is preliminarily stretched.

[0029] Thereafter, as the male die head 11 gradually moves close to the female die cavity 22, the edge part of the workpiece will be bent and deformed along the cavity wall of the female die cavity 22 in order to maintain the continuity with the central part and the overall balance. Since the cavity wall is around the forming protrusion 21 region, the vertical or nearly vertical part thereof will guide the edge material of the workpiece to bend in this vertical direction. At the same time, the male die head 11, in the process of moving downward, cooperates with the female die cavity 22 to apply pressure to the workpiece. When the edge of the workpiece begins to bend, the shape and movement direction of the male die head 11 also promote the edge material to be further extruded in the direction of the cavity wall. The space between the male die head 11 and the cavity wall of the female die cavity 22 gradually decreases, so that the edge material of the workpiece is clamped therebetween. And due to the continuous pressure, the material is bent along the cavity wall into a vertical hem. Thus, when the workpiece is stretched and formed, the edge thereof is also simultaneously formed with a hem, without the need for hemming operation on the workpiece, reducing the processing procedure and indirectly improving the production efficiency.

[0030] When the workpiece is formed, the driving assembly again drives the first mold set 10 to move away from the second mold set 20, so that the male die head 11 moves away from the workpiece. At this time, the formed workpiece can be taken out, and then the next cycle operation is started.

[0031] It should be noted that the middle part of the male die head 11 in the embodiment is provided with a cavity. The cavity is arranged corresponding to the forming protrusion 21, so that the male die head 11 can slide downward along the periphery of the forming protrusion 21 into the female die cavity 22 when moving close to the female die cavity 22, and the movement of the male die head 11 will not be affected by the forming protrusion 21.

[0032] In addition, the forming protrusion 21 can be a protruding block or a boss provided on the top of the second die set 20, and the die cavity 22 can be integrally formed or mechanically cut on the outer periphery of the forming protrusion 21, so that the workpiece can be pressed into the die cavity 22 by the punch head 11.

[0033] More specifically, the driving assembly in the embodiment can be selected from a pneumatic cylinder, a hydraulic drive or a driving motor.

[0034] Further, the first die set 10 includes a push plate 12, the punch head 11 includes a connecting ring 112 and a pressure ring 111, the connecting ring 112 is connected with the push plate 12, and the pressure ring 111 is detachably connected with the connecting ring 112 and can extend into the die cavity 22 when the push plate 12 moves close to the die cavity 22. The driving assembly is used to drive the push plate 12 to move close to or away from the second die set 20.

[0035] Specifically, the punch head 11 in the embodiment is composed of the connecting ring 112 and the pressure ring 111, so that a cavity is integrally formed in the middle of the punch head 11. The cavity is correspondingly arranged with the forming protrusion 21, so that the punch head 11 can slide along the periphery of the forming protrusion 21 and move into the die cavity 22 when the punch head 11 moves close to the die cavity 22, forcing the workpiece to deform according to the shape of the forming protrusion 21 and the external force, so that the workpiece is preliminarily stretched and the movement of the punch head 11 is not affected by the presence of the forming protrusion 21.

[0036] More specifically, since the pressure ring 111 for contacting the workpiece is detachably connected with the connecting ring 112, when the pressure ring 111 is worn or deformed after long-term use, the pressure ring 111 only needs to be detached and replaced with a new one, without the need to replace the entire punch head 11, greatly saving maintenance time and cost.

[0037] It should be noted that during assembly, the pressure ring 111 can be threadedly connected with the connecting ring 112 through a connecting member such as a screw or a bolt to achieve detachable connection; or a clamping column, a clamping hook or a clasp structure is arranged on the pressure ring 111, and a clamping groove or a clamping opening structure matched therewith is arranged on the connecting ring 112, so that the pressure ring 111 and the connecting ring 112 are detachably connected, and the detachable connection can also be achieved by plug-in or magnetic attraction, which can be set according to actual needs.

[0038] As a preferred embodiment, the connecting ring 112 is provided with a first through hole, and the pressure ring 111 is provided with a second through hole. Specifically, the first through hole and the second through hole can be threaded holes. During assembly, a connecting member such as a screw, a bolt or a screw is sequentially inserted into the second through hole and the first through hole, so that the pressure ring 111 is threadedly connected with the connecting ring 112 to achieve detachability.

[0039] Further, the edge of the blank holder 111 has a first arc guiding surface, which extends along the circumferential direction of the connecting ring 112.

[0040] Specifically, during the working process of the stretching die, the workpiece blank needs to be gradually deformed from the initial state and fit the shape of the punch head 11. The first arc guiding surface on the outer periphery of the blank holder 111 is like a gentle transition channel, which can make the workpiece blank more smoothly transition from a flat state to a curved state around the blank holder 111. For example, when stretching a cylindrical workpiece, the workpiece blank can be uniformly transformed from a flat plate to a cylindrical shape under the guidance of the first arc guiding surface.

[0041] Compared with the blank holder 111 with a right angle or sharp edge, the blank holder 111 with the first arc guiding surface can avoid the workpiece blank from being sharply bent in the initial stretching stage, thereby reducing the local stress concentration of the workpiece blank and preventing the workpiece blank from being broken or wrinkled in the early stage of stretching.

[0042] More specifically, the first mounting hole is provided on the push plate 12. During assembly, the connecting member such as a screw or a bolt can be inserted through the first mounting hole, so that the push plate 12 can be connected with an external structure (such as a driving shaft on a driving assembly or a plate or a block used to drive the push plate 12 to move up and down).

[0043] Further, the second die set 20 includes a mounting plate 23, and the forming protrusion 21 is arranged on the top of the mounting plate 23. The mounting plate 23 is provided with a connecting protrusion 231, which is arranged in a spaced manner with the forming protrusion 21 and surrounds the outer periphery of the forming protrusion 21, so that the mounting plate 23 is formed with the concave die cavity 22.

[0044] On the basis of this structure, in the embodiment, the connecting protrusion 231 is arranged on the mounting plate 23, and the connecting protrusion 231 is arranged in a spaced manner with the forming protrusion 21 and surrounds the outer periphery of the forming protrusion 21. At this time, the space between the connecting protrusion 231 and the forming protrusion 21 can form a concave cavity, so that the mounting plate 23 is formed with the concave die cavity 22.

[0045] It should be noted that the connecting protrusion 231 can be an annular structure integrally formed or welded on the mounting plate 23.

[0046] Further, the periphery of the forming protrusion 21 has a second arc guiding surface 213, which extends along the circumferential direction of the forming protrusion 21.

[0047] Specifically, at the beginning of the stretching process, the workpiece blank is transitioned from a flat state to deformation around the forming protrusion 21, and the second circular arc guide surface 213 acts as a smooth guide channel to enable the workpiece blank to be more naturally fitted from a flat surface to the protruding portion. For example, when stretching a cylindrical workpiece, the flat material edge can smoothly flow along the circumferential direction of the protrusion under the guidance of the second circular arc guide surface 213, avoiding stress concentration caused by sharp bending of the material at the initial stage. This smooth transition helps to reduce the risk of material rupture at the initial stage of stretching.

[0048] More specifically, the forming protrusion 21 in the embodiment includes a mounting table 211 and a mounting ring 212, and the second circular arc guide surface 213 is arranged on the periphery of the mounting ring 212. During assembly, the mounting table 211 is mounted at the center of the connecting protrusion 231, and then the mounting ring 212 is detachably arranged on the top end of the mounting table 211, so that the mounting ring 212 can be disassembled at any time, facilitating later maintenance and replacement.

[0049] It should be noted that the mounting ring 212 and the mounting table 211 can also be connected by snap connection or threaded connection to achieve detachable connection.

[0050] As a preferred embodiment, the mounting ring 212 and the mounting table 211 are detachably connected by threaded connection, so that the mounting ring 212 and the mounting table 211 are more tightly connected after connection. Specifically, a third through hole is arranged on the mounting table 211, and a fourth through hole is arranged on the mounting ring 212. The third through hole and the fourth through hole are threaded holes, and are used to pass through connecting members such as screws, bolts or screws to lock the mounting ring 212 and the mounting table 211.

[0051] More specifically, the mounting plate 23 is also provided with a plurality of second mounting holes, which are spaced apart and uniformly distributed around the mounting plate 23, so that the mounting plate 23 can be stably connected to the external structure (such as the machine body or the workbench) by connecting members (such as screws or bolts) around the mounting plate 23.

[0052] The technical means disclosed in the utility model scheme is not limited to the technical means disclosed in the above-mentioned embodiments, but also includes technical solutions composed of any combination of the above technical features. It should be noted that for ordinary skilled persons in the art, without departing from the principles of the utility model, some improvements and refinements can be made, and these improvements and refinements are also considered within the protection scope of the utility model.

Claims

1. A stretch die characterized in that, The utility model relates to a die set, which comprises: a die body, the die body includes first mould group and second mould group, first mould group with second mould group opposite setting and can be close or far from second mould group movement, the bottom of first mould group has punch head, the top of second mould group has forming protrusion and female die cavity, forming protrusion is used to install work piece, female die cavity extends along the circumference of forming protrusion and with punch head opposite setting, punch head is used to pressurize work piece when first mould group is close to second mould group movement, and stretches into female die cavity to make work piece stretch along the cavity wall of female die cavity and has the edge curling of shaping; a driving assembly for driving first mould group to move close to second mould group.

2. The stretch-draw mold of claim 1, wherein, First mould group includes push plate, punch head includes connecting ring and edge ring, connecting ring is connected with push plate, and edge ring is detachably connected with connecting ring and is used to stretch into female die cavity when push plate moves close to female die cavity, and the driving assembly is used to drive push plate to move close to or away from second mould group.

3. The stretch-draw mold of claim 2, wherein, First through hole is arranged on the connecting ring, second through hole is arranged on the edge ring, and the first through hole and the second through hole are used to pass through the connecting piece.

4. The stretch-draw mold of claim 2, wherein, The edge of the edge ring has a first circular arc guide surface, and the first circular arc guide surface is arranged along the circumference of the connecting ring.

5. The stretch-draw mold of claim 2, wherein, First mounting hole is arranged on the push plate, and the first mounting hole is used to pass through the connecting piece.

6. The stretch-draw mold of claim 1, wherein, Second mould group includes mounting plate, forming protrusion is arranged on the top of mounting plate, connecting protrusion is arranged on the mounting plate, connecting protrusion is spaced apart from forming protrusion and surrounds the outer periphery of forming protrusion, so that the female die cavity is formed on the mounting plate.

7. The stretch-draw mold of claim 6, wherein, The periphery of the forming protrusion has a second circular arc guide surface, and the second circular arc guide surface extends along the circumference of the forming protrusion.

8. The stretch-draw mold of claim 7, wherein, The forming protrusion includes a mounting table and a mounting ring, the mounting table is connected with the mounting plate, the mounting ring is located at the top end of the mounting table, and the mounting ring is detachably connected with the mounting ring, and the second circular arc guide surface is arranged on the mounting ring.

9. The stretch-draw mold of claim 8, wherein, Third through hole is arranged on the mounting table, fourth through hole is arranged on the mounting ring, and the third through hole and the fourth through hole are used to pass through the connecting piece.

10. The stretch-draw mold of claim 6, wherein, A plurality of second mounting holes are arranged on the mounting plate, and the plurality of second mounting holes are used to pass through the connecting piece.

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