Plate shearing die

Abstract

The invention belongs to the technical field of dies, and discloses a plate shearing die which comprises a lower die base and an upper die assembly, the lower die base is provided with a blanking opening and used for bearing a plate, the upper die assembly comprises an upper die base, a male die and a plurality of shearing blades, the male die is connected to the upper die base, and the shearing blades are evenly arranged on the periphery of the male die in a surrounding mode. The thickness of the cutting edges is gradually reduced in the direction close to the plate to form a cutting inclined face, and the cutting inclined face is located on the opposite sides of the multiple cutting edges. By forming the cutting inclined surface on the cutting edge, the contact area between the cutting edge and the plate is reduced, and the pressure between the cutting edge and the plate is increased, so that the shearing force required for breaking the plate can be achieved in an extremely short time during shearing, the proportion of a fillet belt after a section is formed is reduced, and the section is smoother; in addition, due to the fact that the cutting slopes are located on the opposite sides of the multiple cutting blades, the transverse acting force towards the formed plate is reduced in stress, and the forming quality of the cut plate is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of molds, and particularly to a sheet metal shearing mold. Background Art

[0002] A common processing method for cutting sheet metal is to use a stamping machine to punch and cut the material with upper and lower cutting edges. Currently, conventional stamping machines usually use flat edges to cut sheet metal. However, when using a flat edge to cut large-sized sheet metal, due to the large contact area between the flat edge and the sheet metal, during blanking, in addition to the shearing force along the blanking direction, a horizontal thrust in the transverse direction will also be generated at the cut, resulting in a large rounded corner zone on the cross-section of the sheet metal after blanking, thus affecting the forming quality of the sheet metal after cutting.

[0003] Therefore, there is an urgent need for a sheet metal shearing mold to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a sheet metal shearing mold, which has a smaller rounded corner zone on the cross-section after blanking and high forming quality of the sheet metal after cutting.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A sheet metal shearing mold is provided, and the sheet metal shearing mold includes:

[0007] A lower die base, the lower die base is provided with a blanking port, and the sheet metal is placed on the lower die base;

[0008] An upper die assembly, the upper die assembly includes an upper die base, a punch, and multiple cutting edges. The punch is connected to the upper die base and corresponds to the blanking port. The upper die base is used to drive the punch to approach or move away from the sheet metal. Multiple cutting edges are evenly arranged around the outer circumference of the punch. The thickness of the cutting edge gradually decreases along the direction approaching the sheet metal to form a cutting slope, and the cutting slope is located on one side where multiple cutting edges face each other.

[0009] Optionally, one end of the cutting edge facing the sheet metal is a cutting edge, and the cutting edges of multiple cutting edges arranged around the outer circumference of the punch together form a continuous and non-linear shearing edge.

[0010] Optionally, the distances from the cutting edges of every two adjacent cutting edges to the sheet metal are all different, so that after multiple cutting edges are unfolded circumferentially, a stepped shearing edge is formed.

[0011] Optionally, the cutting edge of each cutting edge is an inclined edge, so that after multiple cutting edges are unfolded circumferentially, an oblique linear shearing edge is formed.

[0012] Optionally, the cutting edge of each of the cutting blades is serrated, so that after the plurality of cutting blades are unfolded circumferentially, a serrated cutting edge is formed.

[0013] Optionally, the punch is consistent with the shape of the blanking port and the sheet material after shearing.

[0014] Optionally, the upper die assembly further includes connecting bolts for detachably connecting the plurality of cutting blades to the outer periphery of the punch.

[0015] Optionally, the blanking port includes a first hole section and a second hole section communicating with the first hole section, the first hole section is a linear hole, and the second hole section is a tapered hole.

[0016] Optionally, the upper die assembly further includes a knockout block, and a central slideway is provided in the punch, and the knockout block is slidably disposed in the central slideway.

[0017] Optionally, the upper die assembly further includes a stripper plate, the stripper plate is sleeved on the outside of the punch, and is liftably connected to one end of the upper die holder facing the lower die holder.

[0018] Advantages of the present invention:

[0019] The present invention provides a sheet material shearing die. By making the thickness of the cutting blades arranged around the outer periphery of the punch gradually decrease in the direction close to the sheet material, a cutting inclined surface is formed, reducing the contact area between the cutting blade and the sheet material and increasing the pressure between the two. When the cutting blade contacts the sheet material, the shearing force required to break the sheet material can be achieved in a very short time, thereby reducing the proportion of the rounded corner band after the cross-section is formed, making the cross-section after shearing smoother. Moreover, since the cutting inclined surface is located on the side where the plurality of cutting blades face each other, compared with the cutting blades with flat edges, the lateral force towards the formed sheet material is reduced in terms of force, improving the forming quality of the sheet material after cutting. Description of the drawings

[0020] Figure 1 is a structural sectional view of the sheet material shearing die of the present invention;

[0021] Figure 2 is Figure 1 the enlarged front view of part A in

[0022] Figure 3 is Figure 1 the enlarged side view of part A in

[0023] Figure 4 is a schematic diagram of the stepped cutting edge formed by the cutting edges of the plurality of cutting blades in the sheet material shearing die of the present invention;

[0024] Figure 5 It is a schematic diagram of the bevel-shaped shearing edge formed by the edges of multiple cutting edges in the sheet metal shearing die of the present invention;

[0025] Figure 6 It is a schematic diagram of the serrated shearing edge formed by the edges of multiple cutting edges in the sheet metal shearing die of the present invention;

[0026] Figure 7 It is a sectional view of the sheet metal after being sheared by the sheet metal shearing die of the present invention;

[0027] Figure 8 It is a force diagram of the sheet metal during the shearing operation of the sheet metal by the conventional flat-edge cutting edge;

[0028] Figure 9 It is a force diagram of the sheet metal during the shearing operation of the sheet metal by the cutting edge with a cutting slope in the sheet metal shearing die of the present invention.

[0029] In the figure:

[0030] 100, sheet metal; 200, main piston; 300, auxiliary piston; 400, material pushing piston;

[0031] 1, lower die base; 11, blanking port; 111, first hole section; 112, second hole section;

[0032] 2, upper die assembly; 21, upper die base; 22, punch; 23, cutting edge; 231, cutting slope; 232, edge; 24, connecting bolt; 25, material pushing block; 26, stripper plate. Specific embodiments

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Additionally, it should be noted that for the sake of description, only parts related to the present invention are shown in the accompanying drawings rather than all structures.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact of the first and second features, or may include the contact of the first and second features not directly but through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0036] In the description of this embodiment, the terms "above", "below", "right", etc., the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0037] In order to reduce the proportion of the rounded corner band at the cross-section after the sheet material is sheared and improve the forming quality of the sheet material after cutting, this embodiment provides a sheet material shearing die.

[0038] As Figures 1 to 9 shown, the sheet material shearing die includes a lower die base 1 and an upper die assembly 2. The lower die base 1 is provided with a blanking hole 11. The sheet material 100 is placed on the lower die base 1. The upper die assembly 2 includes an upper die base 21, a punch 22 and a plurality of cutting edges 23. The punch 22 is connected to the upper die base 21 and corresponds to the blanking hole 11. The upper die base 21 is used to drive the punch 22 to approach or move away from the sheet material 100. The plurality of cutting edges 23 are evenly arranged around the outer periphery of the punch 22. The thickness of the cutting edge 23 gradually decreases along the direction approaching the sheet material 100 to form a cutting inclined surface 231. The cutting inclined surface 231 is located on the side where the plurality of cutting edges 23 face each other.

[0039] By making the thickness of the cutting edge 23 arranged around the outer periphery of the punch 22 gradually decrease along the direction approaching the sheet material 100, thereby forming the cutting inclined surface 231, the contact area between the cutting edge 23 and the sheet material 100 is reduced, and the pressure between the two is increased, so that when the cutting edge 23 contacts the sheet material 100, the shearing force required to break the sheet material 100 can be achieved in a very short time, thereby reducing the proportion of the rounded corner band after the cross-section is formed, making the cross-section after shearing smoother, and since the cutting inclined surface 231 is located on the side where the plurality of cutting edges 23 face each other, compared with the cutting edge 23 with a flat edge, the lateral force towards the formed sheet material 100 is reduced in terms of force, improving the forming quality of the sheet material 100 after cutting.

[0040] This sheet metal shearing die can be used for the shearing and forming of various sheets 100. In this embodiment, this sheet metal shearing die is mainly applied to shear a kind of sheet metal backing plate commonly used in the fields of automobiles, aviation, and aerospace. The sheet metal shearing die is installed in a stamping machine. The upper die assembly 2 is connected to the stamping oil cylinder through the upper die holder 21. Under the action of the stamping oil cylinder, the upper die holder 21 drives the punch 22 to approach or move away from the sheet 100, realizing the shearing of the sheet 100. And a flat edge for cutting the sheet 100 is also provided at the edge of the blanking port 11 of the lower die holder 1, so as to facilitate the interaction with the upper die holder 21 and realize the shearing operation of the sheet 100.

[0041] When the cutting edge 23 cuts the sheet 100, the cross-section formed after the shearing of the sheet 100 can be divided into four regions as shown in Figure 7 When the upper die holder 21 starts to move downward to drive the cutting edge 23 to shear the sheet 100, due to the pressure of the upper die holder 21 and the lower die holder 1 on the sheet 100, a rounding zone a is formed at the upper end of the cross-section of the sheet 100, and a rolling zone b is formed at the lower end of the cross-section of the sheet 100. When the upper die holder 21 continues to press down, the sheet 100 is sheared under the action of the shearing force, forming a bright zone c. When the upper die holder 21 continues to move downward, the internal stress of the sheet 100 reaches the shearing limit and starts to break, forming a shear fracture zone d.

[0042] As Figure 8 can be seen, when using the cutting edge 23 with a traditional flat edge to cut the sheet 100, the shearing force F will be decomposed into a horizontal force F1 and a longitudinal force F2. Due to the existence of the horizontal force F1, a relatively large rounding zone a is formed at the upper end of the cross-section of the sheet 100. And as shown in Figure 9 , when using the cutting edge 23 with a cutting slope 231 to cut the sheet 100, the shearing force F only has the longitudinal force F2, thereby reducing the area of the rounding zone a at the upper end of the cross-section of the sheet 100, making the cross-section smoother.

[0043] Optionally, as shown in Figures 4 to 6 , the end of the cutting edge 23 facing the sheet 100 is the cutting edge 232. The cutting edges 232 of multiple cutting edges 23 arranged around the punch 22 together form a continuous and non-linear shearing edge. The cutting edges 232 of multiple cutting edges 23 arranged around the punch 22 together form a continuous and non-linear shearing edge, so that the cutting edge 232 gradually contacts the sheet 100 during shearing, further enhancing the pressure on the sheet 100 during shearing, reducing the punching force required during shearing, and thus reducing the requirement for the tonnage of the forming equipment. And due to the reduction of the punching force, the impact force generated during shearing is also reduced, making the shearing process more stable and the noise smaller.

[0044] Specifically, as shown in Figure 4As shown, the distances between the cutting edges 232 of every two adjacent cutting blades 23 from the sheet 100 are different. After the multiple cutting blades 23 are unfolded circumferentially, a stepped shearing edge is formed. By making the distances between the cutting edges 232 of every two adjacent cutting blades 23 from the sheet 100 different, a stepped shearing edge is formed after the multiple cutting blades 23 are unfolded circumferentially, thus meeting the characteristics of continuity and non-linearity to reduce the blanking force required during shearing. In this embodiment, the cutting blades 23 have two cutting edges 232 with different heights, and the cutting blades 23 with cutting edges 232 of different heights are alternately arranged around the outer circumference of the punch 22. In other embodiments, cutting blades 23 with multiple cutting edges 232 of different heights can also be provided to form stepped shearing edges of different shapes.

[0045] Specifically, as Figure 5 shown, the cutting edge 232 of each cutting blade 23 is an inclined edge. After the multiple cutting blades 23 are unfolded circumferentially, an inclined linear shearing edge is formed. By making the cutting edge 232 of each cutting blade 23 an inclined edge, an inclined linear shearing edge is formed after the multiple cutting blades 23 are unfolded circumferentially, thus meeting the characteristics of continuity and non-linearity and reducing the blanking force required during shearing. In this embodiment, the cutting blades 23 have two cutting edges 232 with different inclination directions. The cutting blades 23 with cutting edges 232 of the same inclination direction are in one group, and the two groups of cutting blades 23 with cutting edges 232 of different inclination directions form an inverted V-shaped shearing edge after unfolding. In other embodiments, cutting blades 23 with multiple cutting edges 232 of different inclination directions can also be provided to form a wavy shearing edge.

[0046] Specifically, as Figure 6 shown, the cutting edge 232 of each cutting blade 23 is serrated. After the multiple cutting blades 23 are unfolded circumferentially, a serrated shearing edge is formed. By making the cutting edge 232 of each cutting blade 23 serrated, a serrated shearing edge is formed after the multiple cutting blades 23 are unfolded circumferentially, thus meeting the characteristics of continuity and non-linearity and reducing the blanking force required during shearing. In this embodiment, two serrations are provided on the cutting edge 232 of each cutting blade 23. In other embodiments, the number and size of the serrations on the cutting edge 232 of each cutting blade 23 can be freely set according to the specific dimensions of the cutting blade 23.

[0047] Optionally, the punch 22, the blanking port 11 and the shape of the sheet 100 after shearing are the same. By making the punch 22 and the blanking port 11 and the shape of the sheet 100 after shearing the same, multiple cutting blades 23 are arranged on the punch 22, forming a closed cutting profile that is the same as the shape of the sheet 100 after shearing, thus avoiding multiple shears, achieving one-time forming, saving time and effort, and improving the shearing efficiency.

[0048] Optionally, as Figure 1 、Figure 3 As shown, the upper die assembly 2 further includes connecting bolts 24 for detachably connecting a plurality of cutting blades 23 to the outer periphery of the punch 22. By using the connecting bolts 24 to detachably connect the plurality of cutting blades 23 to the outer periphery of the punch 22, on the one hand, it is convenient to replace the worn cutting blades 23, and on the other hand, by replacing the cutting blades 23 with different shapes, after the plurality of cutting blades 23 are unfolded circumferentially, different-shaped cutting edges can be formed.

[0049] Optionally, as Figure 1 shown, the blanking port 11 includes a first hole section 111 and a second hole section 112 communicating with the first hole section 111. The first hole section 111 is a linear hole, and the second hole section 112 is a tapered hole. By making the first hole section 111 a linear hole, it plays a guiding role for the cut sheet 100 when it falls, and by making the second hole section 112 a tapered hole, it avoids the sheet 100 getting stuck inside the lower die base 1 and ensures that it can slide down by itself after processing.

[0050] Optionally, as Figure 1 shown, the upper die assembly 2 further includes a knockout block 25. The punch 22 is provided with a central slideway, and the knockout block 25 is slidably disposed in the central slideway. Since there is a cavity formed between the plurality of cutting blades 23, the cut sheet 100 may be stuck in the cavity between the plurality of cutting blades 23. Therefore, by providing the knockout block 25 that slides in the central slideway of the punch 22, the sheet 100 stuck in the cavity between the plurality of cutting blades 23 is knocked down, so that it can smoothly slide out from the blanking port 11 of the lower die base 1. In this embodiment, the stamping cylinder on the stamping machine is a double-piston cylinder, including a main piston 200 and a sub-piston 300. The sub-piston 300 is disposed inside the main piston 200. The main piston 200 is connected to the upper die base 21, and the sub-piston 300 is connected to the knockout block 25 through the central slideway for driving the up-and-down sliding of the knockout block 25.

[0051] Optionally, as Figure 1As shown, the upper die assembly 2 further includes a stripper plate 26 , which is sleeved on the outer side of the punch 22 and is liftably connected to one end of the upper die base 21 facing the lower die base 1 . After cutting, the sheet 100 will form a circle of waste material on the periphery of the cutting blade 23, and there is a possibility that the waste material is stuck on the outside of the punch 22. Therefore, a stripping plate 26 that can be raised and lowered on the upper die base 21 is provided on the outside of the punch 22, so as to facilitate the separation of the punch 22 and the waste material stuck on the outside of the punch 22. In addition, during shearing, the sheet 100 located on the inner side of the multiple cutting blades 23 will be subjected to downward pressure, while the sheet 100 located on the outer side of the multiple cutting blades 23 will be subjected to upward thrust. In order to avoid the sheet 100 located on the outer side of the multiple cutting blades 23 from bending upward during shearing, before the shearing begins, the stripping plate 26 is lowered to press the sheet 100 located on the outer side of the multiple cutting blades 23 against the lower die base 1, and then the shearing operation is performed, thereby avoiding the sheet 100 located on the outer side of the multiple cutting blades 23 from bending upward during shearing, thereby improving the forming quality after shearing. In this embodiment, the punching machine is further provided with a punching cylinder, and the punching piston 400 of the punching cylinder passes through the upper die base 21 to be connected to the discharge plate 26 and is used to drive the discharge plate 26 to rise and fall.

[0052] When this embodiment is in use, the sheet 100 is first placed on the lower die base 1, and the multiple cutting blades 23 are connected to the punch 22 by connecting bolts 24. Then, the punching piston 400 of the punching cylinder is used to drive the unloading plate 26 to move in the direction close to the sheet 100, so that the unloading plate 26 presses the sheet 100 on the lower die base 1, and then the punching cylinder of the punching machine is used to drive the upper die base 21 to drive the punch 22 to move in the direction close to the sheet 100. Driven by the upper die base 21, the multiple cutting blades 23 cut and shape the sheet 100 until the cutting blades 23 extend into the blanking port 11, completing the shearing operation of the sheet 100. Since the opposite sides of the cutting blades 23 are inclined, the sheet 100 after cutting will be stuck in the multiple cutting blades. The cutting blades 23 are placed in the cavity, and then the auxiliary piston 300 in the stamping cylinder drives the punching block 25 to push the sheet 100 stuck in the cavity formed by the multiple cutting blades 23, so that it falls into the blanking port 11. Then the auxiliary piston 300 drives the punching block 25 to reset. After the punching block 25 is reset, the main piston 200 drives the upper die base 21 to rise, so that the upper die base 21 drives the punch 22 to rise. At this time, the stripper plate 26 presses the waste material on the lower die base 1, thereby preventing the waste material from rising with the punch 22. When the punch 22 rises with the upper die base 21, the stripper plate 26 separates the waste material from the punch 22. After the main piston 200 is reset, the punching cylinder drives the punching piston 400 to drive the stripper plate 26 to reset, completing the shearing operation.

[0053] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. Sheet metal shearing die, characterized in that: The plate shearing die comprises: A lower die base (1), wherein the lower die base (1) is provided with a blanking opening (11), and a plate (100) is placed on the lower die base (1); An upper die assembly (2), the upper die assembly (2) comprising an upper die base (21), a punch (22) and a plurality of cutting blades (23), the punch (22) being connected to the upper die base (21) and corresponding to the blanking port (11), the upper die base (21) being used to drive the punch (22) to approach or move away from the plate (100), the plurality of cutting blades (23) being evenly arranged around the outer periphery of the punch (22), the thickness of the cutting blades (23) gradually decreasing in a direction approaching the plate (100) to form a cutting bevel (231), the cutting bevel (231) being located on a side opposite to the plurality of cutting blades (23).

2. The plate shearing die according to claim 1, characterized in that: One end of the cutting blade (23) facing the plate (100) is a cutting edge (232), and the cutting edges (232) of the plurality of cutting blades (23) arranged around the periphery of the punch (22) together form a continuous and nonlinear cutting edge.

3. The plate shearing die according to claim 2, characterized in that: The distances between the cutting edges (232) of each two adjacent cutting blades (23) and the plate (100) are different, so that after the plurality of cutting blades (23) are spread out in the circumferential direction, a stepped cutting edge is formed.

4. The plate shearing die according to claim 2, characterized in that: The cutting edge (232) of each cutting blade (23) is a beveled edge, so that after the plurality of cutting blades (23) are spread out in the circumferential direction, a diagonal cutting edge is formed.

5. The plate shearing die according to claim 2, characterized in that: The cutting edge (232) of each cutting blade (23) is serrated, so that after the plurality of cutting blades (23) are spread out in the circumferential direction, a serrated cutting edge is formed.

6. The plate shearing die according to claim 1, characterized in that: The punch (22) and the blanking opening (11) are consistent in shape with the plate (100) after shearing.

7. The plate shearing die according to claim 1, characterized in that: The upper die assembly (2) further comprises connecting bolts (24), and the connecting bolts (24) are used to detachably connect the plurality of cutting blades (23) to the outer periphery of the male die (22).

8. The plate shearing die according to claim 1, characterized in that: The blanking port (11) comprises a first hole section (111) and a second hole section (112) communicating with the first hole section (111); the first hole section (111) is a linear hole, and the second hole section (112) is a tapered hole.

9. The plate shearing die according to claim 1, characterized in that: The upper die assembly (2) further comprises a punching block (25), the punch (22) is provided with a central slideway, and the punching block (25) is slidably arranged in the central slideway.

10. The plate shearing die according to claim 1, characterized in that: The upper die assembly (2) further includes a stripper plate (26), which is sleeved on the outer side of the punch (22) and is liftably connected to one end of the upper die base (21) toward the lower die base (1).

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