Punching blanking female die structure

Abstract

The utility model discloses a stamping blanking female die structure which comprises a female die and a blanking hole, an installation groove is formed in the lower surface of the female die, a fixing block is arranged in the installation groove, a blanking hole is formed in the fixing block, the blanking hole penetrates into the blanking hole, and the orthographic projection area of the blanking hole covers the orthographic projection of the blanking hole. A negative pressure area is formed between the bottom of the blanking hole and the downward maximum stroke position of the male die, an air return channel is formed between the fixing block and the blanking hole, and an enamel layer is arranged on the inner side wall of the blanking hole. External air enters the negative pressure area from the bottom of the air return channel, air pressure balance of the position is guaranteed, waste materials are prevented from being upwards pumped out due to negative pressure, and material jumping during high-speed stamping is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to punch die field, especially involves a punch blanking female die structure. BACKGROUND

[0002] In the process of using the die to punch, the male die moves downward at the top of the continuous punching die, the male die and the female die act on each other, the stainless steel coil between the male die and the female die is punched, and in the process that the male die moves upward and leaves the female die, the waste material moves upward along with the male die due to the action of air pressure or electrostatic force, which constitutes the waste material jumping.

[0003] In order to solve the above problems, our company applied for a utility model patent with the application number of 201820535561.5 in 2018, which solved the above problems by setting a groove on the side of the punching hole. In the process of low-speed punching, the waste material solved the above problems by forming an arc-shaped ear through the groove, but in the process of continuous high-speed punching, due to the rapid upward movement of the male die, the negative pressure formed between the channel and the punch piece caused the friction between the arc-shaped ear of the punch piece and the side wall of the channel to be insufficient to limit the jumping of the waste material, so the problem of jumping needs to be further solved. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims to provide a punch blanking female die structure, which reduces the generation of negative pressure through back gas during the upward movement of the male die after punching is completed, thereby avoiding material jumping.

[0005] The above technical purpose of the utility model is realized by the following technical scheme: a punch blanking female die structure, comprising a female die and a punching hole, the punching hole is arranged on the upper surface of the female die, the female die is provided with a first arc-shaped groove on both sides of the punching hole, the lower surface of the female die is provided with a mounting groove, a fixed block is arranged in the mounting groove, a blanking hole is arranged in the fixed block, the punching hole penetrates into the blanking hole, the orthographic projection area of the blanking hole covers the orthographic projection of the punching hole, a negative pressure area is formed between the bottom of the punching hole and the maximum downward travel position of the male die, a back gas channel is formed between the fixed block and the punching hole, one end of the back gas channel penetrates into the negative pressure area of the blanking hole, the other end of the back gas channel penetrates the bottom of the blanking hole, and the inner side wall of the blanking hole is provided with an enamel layer.

[0006] As a preferred, the average area of the cross section of the back gas channel is S1, the area of the cross section of the punching hole is S2, the area of the cross section of the blanking hole is S3, and the sum of the cross section of the back gas channel and the cross section of the punching hole is greater than or equal to twice the cross section area of the blanking hole.

[0007] By adopting the technical scheme, the cross-sectional area of the air inlet is ensured to be larger than the cross-sectional area of the upward extraction of the male die, the air return is ensured to be smooth, the negative pressure is reduced, and the waste is prevented from jumping up.

[0008] Preferably, two sides of the blanking hole are provided with a second arc-shaped groove corresponding to the first arc-shaped groove in the height direction, and the diameter of the second arc-shaped groove is larger than that of the first arc-shaped groove.

[0009] By adopting the technical scheme, the arc-shaped ear of the waste is prevented from colliding with the side wall of the blanking hole during the falling process, and the contact of the arc-shaped ear is reduced through the second arc-shaped groove.

[0010] Preferably, the air return channel comprises a horizontal channel and a vertical channel, the horizontal channel is arranged on the upper surface of the fixed block, and the vertical channel is arranged on the outer side surface of the fixed block.

[0011] By adopting the technical scheme, the machining is facilitated, and the horizontal channel and the vertical channel are formed by the side wall between the fixed block and the mounting groove.

[0012] Preferably, the cross-sectional shape of the horizontal channel and the vertical channel is semicircular or rectangular or sector-shaped.

[0013] By adopting the technical scheme, the horizontal channel and the vertical channel have different cross-sectional shapes according to different machining methods such as milling or drilling.

[0014] Preferably, the cross-sectional shape of the blanking hole is rectangular, and the vertical channel is arranged at the edge position of the fixed block in the height direction.

[0015] By adopting the technical scheme, the tolerance between the edge position of the fixed block and the mounting groove is reduced, and the fixed block is facilitated to be mounted in the mounting groove.

[0016] Preferably, the air return channel comprises a horizontal air return hole and a vertical air return hole, the horizontal air return hole is horizontally arranged in the fixed block, the horizontal air return hole is arranged through the horizontal direction of the fixed block, the vertical air return hole is arranged through the height direction of the fixed block, and the horizontal air return hole and the vertical air return hole are uniformly distributed in the circumferential direction of the fixed block.

[0017] By adopting the technical scheme, the horizontal air return hole and the vertical air return hole are located inside the fixed block, that is, the machining is realized by drilling.

[0018] Preferably, the two sides of the female die are provided with a stepped hole, the stepped hole is provided with a fastening bolt, and the side surface of the fixed block is provided with a threaded hole corresponding to the fastening bolt.

[0019] By adopting the technical scheme, the connection effect between the installation groove and the horizontal passage and the vertical passage is improved after the fastening bolt is screwed into the threaded hole.

[0020] Preferably, the horizontal air return hole and the horizontal passage have an opening size smaller than the diameter of the first arc-shaped groove.

[0021] By adopting the technical scheme, the arc-shaped ear of the waste material is prevented from being embedded into the first arc-shaped groove.

[0022] In summary, during use, the male die is downwardly punched with the female die, the waste material is pressed downwardly by the male die into the negative pressure area, during upward movement of the male die, the waste material falls under the action of gravity, the male die moves upwardly, at this time, part of air enters between the blanking hole and the waste material from the gap therebetween, external air enters the negative pressure area from the bottom of the air return passage, air pressure balance at this position is ensured, the waste material is prevented from being pulled upwardly due to negative pressure, and material jumping during high-speed punching is reduced; meanwhile, the enamel layer on the surface of the blanking hole reduces friction between the waste material and the blanking hole, and material jumping is reduced; meanwhile, the air return passage realizes air flow to the inside during blanking, and plays a role of air cooling for die cooling to a certain extent. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of the top of example 1;

[0024] Figure 2 is a structural schematic diagram of the bottom of example 1;

[0025] Figure 3 is a structural schematic diagram of the fixing block of example 1;

[0026] Figure 4 is a structural schematic diagram of the bottom of example 1 after removal of the fixing block;

[0027] Figure 5 is a longitudinal sectional schematic diagram of example 1;

[0028] Figure 6 is a sectional schematic diagram of the air return passage of example 2;

[0029] In the drawings, 1 is a female die; 11 is a blanking hole; 12 is a first arc-shaped groove; 13 is an installation groove; 14 is a stepped hole; 15 is a fastening bolt; 2 is a fixing block; 21 is a blanking hole; 22 is a negative pressure area; 23 is an enamel layer; 24 is a second arc-shaped groove; 25 is a threaded hole; 3 is an air return passage; 31 is a horizontal passage; 32 is a vertical passage; 33 is a horizontal air return hole; and 34 is a vertical air return hole. DETAILED DESCRIPTION

[0030] The utility model will be further explained in detail below in combination with the drawings.

[0031] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0032] Example 1:

[0033] like Figures 1 to 5 As shown, a blanking die structure includes a die 1 and a blanking hole 11. The blanking hole 11 has a rectangular cross-sectional shape and is located on the upper surface of the die 1. The die 1 has first arc-shaped grooves 12 on both sides of the blanking hole 11. The lower surface of the die 1 has a mounting groove 13. The mounting groove 13 and the blanking hole 11 have rectangular cross-sectional shapes. A fixing block 2 is provided in the mounting groove 13, and a blanking hole 21 is provided in the fixing block 2. The depth of the blanking hole 11 is less than the depth of the blanking hole 21. The blanking hole 11 penetrates... The die passes through the blanking hole 21. The orthographic projection of the blanking hole 21 covers the orthographic projection of the punching hole 11, that is, the size of the blanking hole 21 is larger than the size of the punching hole 11. A negative pressure zone 22 is formed between the bottom of the punching hole 11 and the maximum downward stroke position of the punch. That is, during punching, the bottom of the punch protrudes from the top of the punching hole 11. A return air channel 3 is formed between the fixing block 2 and the punching hole 11. One end of the return air channel 3 is set through the negative pressure zone 22 of the blanking hole 21, and the other end of the return air channel 3 is set through the bottom of the blanking hole 21.

[0034] To prevent the scrap material from rubbing against the side of the punching hole 11, a second arc-shaped groove 24 is provided on both sides of the blanking hole 21. The second arc-shaped groove 24 is concentric with the first arc-shaped groove 12. The second arc-shaped groove 24 extends through the depth direction of the blanking hole 21. The diameter of the second arc-shaped groove 24 is larger than the diameter of the first arc-shaped groove 12. In the height direction, the second arc-shaped groove 24 is located directly below the first arc-shaped groove 12.

[0035] like Figures 1 to 5 As shown, in embodiment 1, the fixing block 2 is fixed by being embedded in the mounting groove 13. However, due to the inertia during continuous stamping, the fixing block 2 needs to be fixed a second time. Stepped holes 14 are provided on both sides of the die 1. The stepped holes 14 penetrate into the mounting groove 13. The stepped holes 14 are symmetrically arranged on both sides of the mounting groove 13. The side of the fixing block 2 is provided with threaded holes 25 corresponding to the stepped holes 14. The fastening bolt 15 passes through the stepped holes 14 and is threadedly connected to the threaded holes 25, which serves to reinforce the fixing block 2.

[0036] like Figures 2 to 5As shown, in Embodiment 1, the return air channel 3 includes a horizontal channel 31 and a vertical channel 32. The horizontal channel 31 is machined on the upper surface of the fixing block 2 by milling, and the vertical channel 32 is also machined on the outer side of the fixing block 2 by milling. The cross-sectional shapes of the horizontal channel 31 and the vertical channel 32 are semi-circular, rectangular, or fan-shaped. In Embodiment 1, the longitudinal cross-sectional shape of the horizontal channel 31 is rectangular, and the cross-sectional shape of the vertical channel 32 is semi-circular. At the same time, the vertical channel 32 has a 90-degree fan-shaped structure at the edge position in the height direction of the fixing block 2, which facilitates the insertion of the fixing block 2 into the mounting groove 13.

[0037] like Figures 2 to 5 As shown, in order to reduce the generation of negative pressure, the area between the return air channel 3, the punching hole 11 and the blanking hole 21 needs to meet the following conditions: the average area of ​​the cross-section of the return air channel 3 is S1, the area of ​​the cross-section of the punching hole 11 is S2, the area of ​​the cross-section of the blanking hole 21 is S3, and S1+S2-S3≥S3. That is, the sum of the areas of the cross-section of the return air channel 3 and the cross-section of the punching hole 11 is greater than or equal to twice the cross-sectional area of ​​the blanking hole 21. At the same time, in order to avoid interference between the lugs at the opening position of the horizontal channel 31, the opening size of the horizontal channel 31 is smaller than the diameter of the first arc groove 12.

[0038] The inner wall of the blanking hole 21 is provided with an enamel layer 23. The enamel layer 23 has a Mohs hardness of 6, which is higher than the Mohs hardness of 5.5 of the stainless steel blank being punched, effectively reducing the wear between the blank and the side wall of the blanking hole 21.

[0039] Working principle:

[0040] The punch presses the stainless steel sheet downwards into the blanking hole 11 of the die 1 to form scrap. The scrap is pressed downwards by the punch into the negative pressure zone 22 to complete the blanking. During the upward movement of the punch, the scrap falls under the action of gravity. At this time, some air enters the gap between the blanking hole 21 and the scrap. At the same time, external air enters the horizontal channel 31 from the bottom of the vertical channel 32 and then enters the negative pressure zone 22 from the opening of the horizontal channel 31 to ensure the air pressure balance at this position and prevent the scrap from being drawn upwards due to the negative pressure, thereby reducing the material jump during high-speed stamping.

[0041] Example 2:

[0042] like Figure 6As shown, the difference between Example 2 and Example 1 lies in the structure of the back gas passage 3 in Example 2, the back gas passage 3 comprises horizontal back gas holes 33 and vertical back gas holes 34, the horizontal back gas holes 33 are horizontally arranged in the fixed block 2, the horizontal back gas holes 33 are arranged through the horizontal direction of the fixed block 2, the vertical back gas holes 34 are arranged through the height direction of the fixed block 2, the horizontal back gas holes 33 and the vertical back gas holes 34 are uniformly distributed in the circumferential direction of the fixed block 2, and the opening size of the horizontal back gas holes 33 is smaller than the diameter of the first arc-shaped groove 12; the processing mode of Example 2 is different from that of Example 1, and the working principle is the same as that of Example 1.

Claims

1. A stamping blanking die structure, comprising a die (1) and a blanking hole (11), wherein the blanking hole (11) is disposed on the upper surface of the die (1), and the die (1) is provided with first arc-shaped grooves (12) on both sides of the blanking hole (11), characterized in that: The lower surface of the die (1) is provided with a mounting groove (13), a fixing block (2) is provided in the mounting groove (13), a blanking hole (21) is provided in the fixing block (2), the blanking hole (11) extends into the blanking hole (21), the orthographic projection area of ​​the blanking hole (21) covers the orthographic projection of the blanking hole (11), a negative pressure zone (22) is formed between the bottom of the blanking hole (11) and the maximum downward stroke position of the punch, a return air channel (3) is formed between the fixing block (2) and the blanking hole (11), one end of the return air channel (3) extends through the negative pressure zone (22) of the blanking hole (21), the other end of the return air channel (3) extends through the bottom of the blanking hole (21), and an enamel layer (23) is provided on the inner wall of the blanking hole (21).

2. The stamping blanking die structure according to claim 1, characterized in that: The sum of the cross-sectional area of ​​the return air channel (3) and the cross-sectional area of ​​the punch hole (11) is greater than or equal to twice the cross-sectional area of ​​the blanking hole (21).

3. The stamping blanking die structure according to claim 2, characterized in that: The material discharge hole (21) is provided with a second arc groove (24) on both sides, which corresponds to the first arc groove (12) in the height direction. The diameter of the second arc groove (24) is larger than that of the first arc groove (12).

4. The stamping blanking die structure according to claim 3, characterized in that: The return air channel (3) includes a horizontal channel (31) and a vertical channel (32). The horizontal channel (31) is located on the upper surface of the fixed block (2), and the vertical channel (32) is located on the outer side of the fixed block (2).

5. The stamping blanking die structure according to claim 4, characterized in that: The cross-sectional shape of the horizontal channel (31) and the vertical channel (32) is semi-circular, rectangular or fan-shaped.

6. The stamping blanking die structure according to claim 4, characterized in that: The cross-sectional shape of the punch hole (11) is rectangular, and the vertical channel (32) is located at the edge position in the height direction of the fixing block (2).

7. The stamping blanking die structure according to claim 3, characterized in that: The return air channel (3) includes a horizontal return air hole (33) and a vertical return air hole (34). The horizontal return air hole (33) is horizontally arranged inside the fixed block (2) and extends through the horizontal direction of the fixed block (2). The vertical return air hole (34) extends through the vertical direction of the fixed block (2) and is evenly distributed around the circumference of the fixed block (2).

8. The stamping blanking die structure according to claim 3, characterized in that: The die (1) has stepped holes (14) on both sides, and fastening bolts (15) are provided in the stepped holes (14). The side of the fixing block (2) has threaded holes (25) corresponding to the fastening bolts (15).

9. The stamping blanking die structure according to claim 7, characterized in that: The opening size of the horizontal return air hole (33) and the horizontal channel (31) is smaller than the diameter of the first arc groove (12).

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