Drawing die

Abstract

The utility model provides a drawing die, relates to the technical field of punch forming dies, and solves the technical problem that an existing secondary drawing die is poor in secondary drawing effect on a workpiece with a single concave surface or a single convex surface. The drawing die comprises an upper die base, a lower die base, an upper male die and a lower female die, the upper male die and the lower female die are arranged on the upper die base and the lower die base respectively, the upper male die is further provided with a columnar secondary male die used for conducting secondary drawing on a deep machining face, and the upper male die is provided with a through hole used for penetrating through the secondary male die. The lower female die is further provided with a secondary female die used for secondary drawing forming, and the cross section of the through hole and the cross section of the secondary female die are the same as the columnar cross section of the secondary male die. According to the utility model, the blank is subjected to secondary drawing processing in the same die, so that working procedures are saved; and material cracking caused by too high drawing speed can be effectively prevented, and the drawing forming effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of stamping and forming dies, in particular to a drawing die. Background Art

[0002] Drawing process is a commonly used forming method in the field of industrial manufacturing. It has the advantages of fast forming and stable quality, and is suitable for large-scale production. Drawing die is a type of stamping die, which is used to stamp the corresponding products.

[0003] Most of the existing stamping process solutions are conventional one-step drawing forming, but due to the different structural characteristics and sizes of different workpieces, the forming depth and groove angle will have a significant impact on the forming. And for workpieces with large deformation, sequential forming is likely to cause material cracking.

[0004] The secondary drawing in the existing technical solution is mainly achieved by stamping and drawing with two dies in two processes. Specifically, in the first process, a part of the product structure features are pre-drawn or shallowly drawn. Then, the second drawing is performed in another die in the second process. This secondary drawing method requires two-process stamping production. If the existing secondary drawing process is adopted, the number of stamping processes increases, and the mold development cost and later production cost increase.

[0005] Therefore, the patent with publication number CN115889558A proposes a single-die secondary drawing stamping die and process, which saves the stamping process and reduces the production cost by single-die secondary drawing on the same plate. However, the application completes the process in two steps, namely, the upper concave die and the lower punch, and is suitable for processing workpiece structures with concave and convex surfaces. For workpieces with only concave or convex surfaces and relatively fine structures, the device is inconvenient to use and the processing effect is not good. Utility Model Content

[0006] The utility model aims to provide a drawing die to solve the technical problem that the existing secondary drawing die has a poor secondary drawing effect on a workpiece with a single concave or convex surface.

[0007] The embodiments of the present invention are implemented by the following technical solutions:

[0008] A drawing die comprises an upper die base, a lower die base, and an upper punch and a lower die respectively arranged on the upper die base and the lower die base, wherein the upper punch is also provided with a columnar secondary punch for secondary drawing of a deeper processing surface, the upper punch is provided with a through hole for passing through the secondary punch, and the lower die is also provided with a secondary die for secondary drawing, and the cross-sections of the through hole and the secondary die are the same as the columnar cross-section of the secondary punch.

[0009] Preferably, it also includes a first lifting device for controlling the lifting and lowering of the upper punch of the upper die seat and a second lifting device for controlling the lifting and lowering of the secondary punch.

[0010] Preferably, the first lifting device is provided with a limiting plate for limiting the second lifting device.

[0011] Preferably, the upper punch and the lower die are respectively provided with a first pressing edge and a second pressing edge for clamping and fixing the blank.

[0012] Preferably, the first pressing edge and the second pressing edge are further provided with a plurality of groups of mutually interlocked limiting protrusions and limiting concave surfaces for fixing and limiting the blank.

[0013] Preferably, a telescopic rod for guiding the lifting direction and a limiting rod for limiting the lifting degree of the upper mold base are further provided between the upper mold base and the lower mold base.

[0014] Preferably, the upper die base is also provided with a connecting portion for connecting to the frame.

[0015] By adopting this technical solution, the blank is subjected to secondary drawing processing in the same mold through unidirectional secondary drawing forming, thus saving working procedures;

[0016] Moreover, the secondary drawing process is for a processing surface that is deeper than the general processing surface. For this kind of layered processing surface, a single drawing process is prone to cause material cracking when forming a deeper processing surface. By using the same mold for two drawing processes, a shallower processing surface is first drawn, and then a secondary drawing process is performed on the deeper processing surface. This effectively prevents the material from cracking due to excessive drawing speed, saves the secondary drawing process, and improves the drawing effect.

[0017] The technical solution of the embodiment of the utility model has at least the following advantages and beneficial effects:

[0018] 1. The utility model performs secondary drawing processing on the blank in the same mold, saving working procedures;

[0019] 2. The utility model effectively prevents the material from cracking due to excessively fast drawing speed, thereby improving the drawing forming effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1A schematic diagram of the three-dimensional structure of the drawing die provided in Example 1 of the utility model;

[0022] Figure 2 This is a schematic diagram of the front split structure of the drawing die provided in Example 1 of the utility model;

[0023] Figure 3 A schematic diagram of the three-dimensional structure of the upper punch of the drawing die provided in Example 2 of the utility model;

[0024] Figure 4 A schematic diagram of the three-dimensional structure of the lower concave die of the drawing die provided in Example 2 of the utility model;

[0025] Figure 5 A schematic diagram of a portion of the structure of a drawing die provided in Example 2 of the utility model;

[0026] Icons: 1. Upper die base; 2. Lower die base; 3. Upper punch; 31. Through hole; 32. Limiting protrusion; 33. First pressure edge; 4. Lower die; 41. Secondary die; 42. Limiting concave surface; 43. Second pressure edge; 5. Second lifting device; 6. First lifting device; 61. Limiting plate; 7. Telescopic rod; 71. Limiting rod; 8. Connecting part; 9. Secondary punch. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Example 1

[0033] A drawing die comprises an upper die base 1, a lower die base 2, and an upper punch 3 and a lower die 4 respectively arranged on the upper die base 1 and the lower die base 2, the upper punch 3 is also provided with a columnar secondary punch 9 for secondary drawing of a deeper processing surface, the upper punch 3 is provided with a through hole 31 for passing through the secondary punch 9, the lower die 4 is also provided with a secondary die 41 for secondary drawing, and the cross-sections of the through hole 31 and the secondary die 41 are the same as the columnar cross-section of the secondary punch 9.

[0034] In this embodiment, it also includes a first lifting device 6 for controlling the lifting of the upper punch 3 of the upper die holder 1 and a second lifting device 5 for controlling the lifting of the secondary punch 9.

[0035] In this embodiment, the first lifting device 6 is provided with a limiting plate 61 for limiting the position of the second lifting device 5 .

[0036] In this embodiment, the first lifting device 6 and the second lifting device 5 are configured as hydraulic cylinders.

[0037] In this embodiment, the upper die base 1 is further provided with a connecting portion 8 for connecting to a frame.

[0038] Working principle and usage:

[0039] Through unidirectional secondary drawing forming, the blank is subjected to secondary drawing processing in the same mold, saving steps;

[0040] Moreover, the secondary drawing process is for a processing surface that is deeper than the general processing surface. For this kind of layered processing surface, a single drawing process is prone to cause material cracking when forming a deeper processing surface. By using the same mold for two drawing processes, a shallower processing surface is first drawn, and then a secondary drawing process is performed on the deeper processing surface. This effectively prevents the material from cracking due to excessive drawing speed, saves the secondary drawing process, and improves the drawing effect.

[0041] Example 2

[0042] The only difference between this embodiment and the first embodiment is that, in this embodiment, the upper punch 3 and the lower die 4 are respectively provided with a first pressing edge 33 and a second pressing edge 43 for pressing and fixing the blank.

[0043] In this embodiment, the first pressing edge 33 and the second pressing edge 43 are further provided with a plurality of groups of mutually engaged limiting protrusions 32 and limiting concave surfaces 42 for fixing and limiting the blank.

[0044] In this embodiment, a telescopic rod 7 for guiding the lifting direction and a limiting rod 71 for limiting the lifting degree of the upper mold base 1 are further provided between the upper mold base 1 and the lower mold base 2.

[0045] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A drawing die, comprising an upper die base (1), a lower die base (2), and an upper punch (3) and a lower die (4) respectively arranged on the upper die base (1) and the lower die base (2), characterized in that: The upper punch (3) is also provided with a columnar secondary punch (9) for secondary drawing of a deeper processing surface, the upper punch (3) is provided with a through hole (31) for passing through the secondary punch (9), and the lower die (4) is also provided with a secondary die (41) for secondary drawing, and the cross-sections of the through hole (31) and the secondary die (41) are the same as the columnar cross-section of the secondary punch (9).

2. A drawing die according to claim 1, characterized in that: It also includes a first lifting device (6) for controlling the lifting of the upper punch (3) of the upper die seat (1) and a second lifting device (5) for controlling the lifting of the secondary punch (9).

3. A drawing die according to claim 2, characterized in that: The first lifting device (6) is provided with a limiting plate (61) for limiting the position of the second lifting device (5).

4. A drawing die according to any one of claims 1 to 3, characterized in that: The upper punch (3) and the lower die (4) are respectively provided with a first pressing edge (33) and a second pressing edge (43) for pressing and fixing the blank.

5. A drawing die according to claim 4, characterized in that: The first pressing edge (33) and the second pressing edge (43) are also provided with a plurality of groups of mutually engaged limiting protrusions (32) and limiting concave surfaces (42) for fixing and limiting the blank.

6. A drawing die according to any one of claims 1 to 3, characterized in that: A telescopic rod (7) for guiding the lifting direction and a limiting rod (71) for limiting the lifting degree of the upper die seat (1) are also provided between the upper die seat (1) and the lower die seat (2).

7. A drawing die according to any one of claims 1 to 3, characterized in that: The upper die base (1) is also provided with a connecting portion (8) for connecting to a frame.

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