Stainless steel sheet part thinning punch forming process

Abstract

The invention provides a stainless steel sheet part thinning punch forming process which comprises the steps of (1) small point punching on the edge, (2) pre-breaking line punching, (3) punching a long hole in one side of a second frame in the length direction, (4) punching a limiting groove in the opposite side of the long hole of the second frame, (5) continuous leveling, (6) punching and (7) punching. A plurality of punching assemblies are arranged between the first upper die and the first lower die, the thin part between the long hole and the limiting groove is located between the first upper die and the first lower die, and the thin part is flattened to be 50% of the original thickness through pulling of a material belt and multiple flapping; according to the process, the stainless steel plate is continuously and gradually flattened through the continuous stamping die, the thickness part of the stainless steel is reduced, the thin part of the stainless steel is punched with the micro holes through the punch, the problem of punch breakage is reduced, in addition, the sectional rotating block is designed, the problem that Z-fold forms on the same side are different during one-time stamping can be solved, and the production efficiency is improved. And moreover, the stamping length is reduced, and the bending resistance is greatly reduced.

Description

Technical Field

[0001] The invention relates to the field of stamping equipment, in particular to a stainless steel sheet part thinning and stamping forming process. Background Art

[0002] like Figure 7 The metal part shown is made of stainless steel. The structure of the whole product is small, the length is about 3-4cm, the thickness is about 0.4cm, there is a thin part in the middle, the thickness is 1 / 2 of the rest of the parts, and the surface needs to be holed. The traditional method is usually to make holes in the workpiece by etching, but the etching process causes greater pollution. When punching through a continuous die, due to the tiny product, the corresponding die needs to be made smaller, and the punch will also be made smaller. Due to the high strength of stainless steel, when punching through a punch, due to the small aperture, the punch diameter is also small, and it often breaks during the punching process; secondly, because the metal part has a Z-shaped bend on the side, and because the part has a non-planar side and a long length, the Z-fold die can only bend a single section at a time, and it is difficult to operate for discontinuous multiple sections. Summary of the invention

[0003] In order to solve the above technical problems, the present invention proposes a stainless steel sheet part thinning and stamping forming process, comprising:

[0004] Step 1: Punch small dots on the edge to form an outer frame, wherein the outer frame includes a first frame and a second frame, and a connecting portion is provided between the first frame and the second frame;

[0005] Step 2: Punch out the pre-break line on the frame at the connection position;

[0006] Step 3, punching out an elongated hole on one side of the second frame in the length direction, wherein the edge of the elongated hole is close to the outer frame;

[0007] Step 4: Punch out a limiting groove on the opposite side of the elongated hole of the second frame, the edge of the limiting groove is close to the outer frame, and steps 3 and 4 leave space for flattening;

[0008] Step 5: Continuously flattening: multiple sets of punching components are respectively arranged between the first upper die and the first lower die. The thin part between the long hole and the limit groove is located between the first upper die and the first lower die. The material belt is pulled and beaten multiple times to flatten the thin part to 50% of the original thickness.

[0009] Step 6: Dotting the thin part, by stamping the thin surface;

[0010] Step seven, flatten and shape, and cut off the excess part after flattening by punching with the punching block that originally punched out the elongated holes and limit grooves.

[0011] Preferably, the punching needle for punching is square in cross section, and the end is a terraced structure, and the hole at the end is 0.05 cm.

[0012] Preferably, the step also includes setting a concave die by the upper die and a convex die by the lower die, so as to simultaneously form two protrusions protruding toward the upper die in the first frame.

[0013] Preferably, step nine is also included, in which holes are punched along the length direction of the first frame and the second frame on the same side of the first frame and the second frame, and then holes are punched in the length direction of the other side of the first frame and the second frame after pulling the material strip, and the edges of the holes are in contact with the small dots of the first frame or the second frame.

[0014] Preferably, secondary stamping is performed to remove burrs on the outer frame.

[0015] Preferably, it also includes a Z-shaped bending process, in which the first frame, the second frame and the end of the connecting part are simultaneously Z-shaped, and an intermediate pressure block is set by the second upper mold. An inverted U-shaped pressure block is sleeved on the upper part of the intermediate pressure block, and an elastic member is provided between the U-shaped pressure block and the intermediate pressure block. A T-shaped block is arranged on the second lower mold, and a plurality of groups of rotating blocks are coaxially arranged on both sides of the lower part of the horizontal part of the T-shaped block. The rotating blocks are arranged according to different bending positions. When pressed down, the rotating blocks flip upwards, and the edge of the first frame, the edge of the second frame and the connecting part are bent at the same time.

[0016] Preferably, the material strips between adjacent formed workpieces are cut off and discharged.

[0017] Preferably, there are five beating stations, and the material strip is beaten once each time it is pulled through a station.

[0018] Preferably, the upper die of the stamping assembly is an inclined surface, and the acute angles between the upper die of adjacent workstations and the horizontal plane are 2°, 1.5°, 1°, 0.5°, and 0°, respectively.

[0019] Preferably, the thickness of the thin portion is 0.2 cm.

[0020] The stainless steel sheet parts thinning stamping forming process proposed in the present invention has the following beneficial effects: the process flattens the stainless steel plate continuously and step by step through a continuous stamping die, reduces the thickness of the stainless steel, and then punches micro holes in the thin part of the stainless steel through a punch, thereby reducing the problem of punch breakage. In addition, by designing a segmented rotating block, the problem of different Z-bend shapes on the same side can be solved during one stamping, and the stamping length is reduced, which greatly reduces the bending resistance and ensures the bending effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below.

[0022] Figure 1 A schematic diagram of the process flow of the invention;

[0023] Figure 2 It is a schematic diagram of the mold part corresponding to the process of step 1 to step 6 of the present invention;

[0024] Figure 3 It is a schematic diagram of the mold part corresponding to the process from embossing to punching and blanking of the present invention;

[0025] Figure 4 It is a schematic diagram of the flattening mold of the present invention;

[0026] Figure 5 A schematic diagram of the connection of the rotating block of the present invention;

[0027] Figure 6 It is a schematic diagram of the Z-shaped bending mold of the present invention;

[0028] Figure 7 A schematic diagram of a workpiece of the present invention;

[0029] Figure 8 It is a schematic diagram of the dotting part of the present invention;

[0030] Among them, 1. pre-breaking line; 2. elongated hole; 3. limiting groove; 4. stamping assembly; 5. dotting; 6. first frame; 7. second frame; 8. connecting part; 9. first upper die; 10. first lower die; 11. second upper die; 12. intermediate pressure block; 13. U-shaped pressure block; 14. elastic member; 15. T-shaped block; 16. rotating block; 17. rotating shaft; 18. protrusion; S1. edge punching point; S2. pre-breaking line; S3. punching elongated hole; S4. punching limiting groove; S5. flattening; S6. dotting; S7. punching convex; S8. punching groove; S9. deburring; S10. Z-shaped bending; S11. punching and cutting. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0032] like Figure 1 , Figure 2 As shown, the present invention proposes a stainless steel sheet part thinning and stamping forming process, comprising:

[0033] Step 1: Punch small dots on the edge to form an outer frame. The outer frame includes a first frame 6 and a second frame 7. There is a connecting portion 8 between the first frame 6 and the second frame 7. Punching small dots on the edge helps to make the stamping more stable during the subsequent trimming and forming, and the product is easier to fall off, reducing the problem of punching deformation.

[0034] Step 2: Punch out the pre-breaking line 1 on the frame at the position of the connecting part 8. The connecting part 8 is located between the first frame 6 and the second frame 7. The pre-breaking line 1 is the position where the two ends of the connecting part 8 are connected to the material strip;

[0035] Step 3, punch out an elongated hole 2 on one side of the length direction of the second frame 7, and the edge of the elongated hole 2 is close to the external frame; Step 4, punch out a limiting groove 3 on the opposite side of the elongated hole 2 of the second frame 7, and the edge of the limiting groove 3 is close to the external frame. Steps 3 and 4 leave space for flattening; the position of the elongated hole 2 and the limiting groove 3 will be flattened, and the area will be increased during the flattening process. Specifically: Step 5, continuous flattening, multiple groups of stamping components 4 are respectively arranged on the first upper mold 9 and the first lower mold 10, and the thin part between the elongated hole 2 and the limiting groove 3 is located between the first upper mold 9 and the first lower mold 10. The material belt is pulled and beaten for multiple times to flatten the thickness of the thin part to 50% of the original thickness; there are 5 beating stations, and the material belt is beaten once each time it is pulled to a station, such as Figure 4 , Figure 5 As shown, the stamping assembly 4 includes a first upper die 9 and a first lower die 10, the lower part of the first upper die 9 is an inclined surface, and the acute angles between the upper dies of adjacent workstations and the horizontal plane are 2°, 1.5°, 1°, 0.5°, and 0°, respectively. After 5 levelings, the workpiece gradually sinks on the side facing the limit groove 3 during the leveling process, and then the angle is gradually flattened after four levelings, so that the stainless steel plate can be slowly stamped and then gradually flattened. In this embodiment, the final thickness is 0.2 cm, but it is not limited to this thickness. The method of gradually reducing the angle can be used for slow stamping to ensure the leveling effect, prevent the material from being punctured due to one stamping, or cause the stamping surface to be uneven or warped when the stamping is flattened, and effectively solve the problem of easy breakage of micro parts and micro punches.

[0036] After the stainless steel plate is flattened, the thickness is reduced, and then step six, the thin part is formed by punching 5 on the thin surface. The cross-section of the punching needle of the punching point 5 is square, and the end is a stepped structure. The hole at the end is 0.05cm, the punching is stable, and the yield rate is high.

[0037] like Figure 3 As shown, step 7, flattening and shaping, cutting the excess part after flattening by punching with the punching block that originally punched out the elongated hole 2 and the limiting groove 3. It also includes step 8, setting a concave die by the upper die and a convex die by the lower die, forming two protrusions 18 convex in the upward direction in the first frame at the same time, and punching out the protrusions 18 of the square structure in the first frame and the second frame.

[0038] It also includes step nine, punching a hole groove along the length direction of the first frame 6 and the second frame 7 on the same side of the first frame 6 and the second frame 7, and then punching a hole groove in the length direction of the other side of the first frame 6 and the second frame 7 after pulling the material strip, the edge of the hole groove fits with the small point of the first frame 6 or the second frame 7, and the edge of the workpiece is punched through the two hole grooves. Due to the small point punched first, the workpiece and the material strip are easily separated during punching, and the surface of the workpiece is prevented from being deformed due to the stress generated during punching, and then a second punching is performed to remove the burrs of the external frame caused by punching the small points.

[0039] Finally, if Figure 6 As shown, since the edge of the workpiece is bent downward in a Z-shape, a Z-shape bending process is also included. The first frame 6, the second frame 7 and the end of the connecting portion 8 are simultaneously bent in a Z-shape, and an intermediate pressing block 12 is provided through a second upper die 11. An inverted U-shaped pressing block 13 is sleeved on the upper part of the intermediate pressing block 12. An elastic member 14 is provided between the U-shaped pressing block 13 and the intermediate pressing block 12. The elastic member 14 can be a spring or other structure. A T-shaped block 15 is provided on the second lower die. The lower part of the horizontal portion of the T-shaped block 15 is provided with two coaxially disposed portions on both sides. Multiple groups of rotating blocks 16. In this embodiment, the rotating blocks 16 can be set to 3 groups, corresponding to the first frame, the connecting portion 8 and the second frame respectively. When the workpiece is pulled to this position, the second upper mold 11 is pressed down, and the middle pressing block 12 presses the workpiece. Subsequently, the rotating blocks 16 are set according to different bending positions. When pressed down, the rotating blocks 16 flip upward, and at the same time, the edge of the first frame 6, the edge of the second frame 7 and the connecting portion 8 are bent. The segmented rotating blocks 16 can reduce the stress on the upper mold when pressing down on the upper part, thereby ensuring the stability of the punching.

[0040] After the above is completed, the strips between adjacent formed workpieces are cut off and discharged. There are some shaping and fine-tuning processes in the whole process, which are existing technologies and will not be repeated in the above text.

Claims

1. A stainless steel sheet parts thinning stamping process, characterized in that: include: Step 1: Punching dots on the edge to form an outer frame by punching small dots. The outer frame includes a first frame and a second frame. There is a connecting portion between the first frame and the second frame. Step 2: Punch out the pre-break line on the frame at the connection position; Step 3, punching out an elongated hole on one side of the second frame in the length direction, wherein the edge of the elongated hole is close to the outer frame; Step 4: Punch out a limiting groove on the opposite side of the elongated hole of the second frame, the edge of the limiting groove is close to the outer frame, and steps 3 and 4 leave space for flattening; Step 5: Continuously flattening: multiple sets of punching components are respectively arranged between the first upper die and the first lower die. The thin part between the long hole and the limit groove is located between the first upper die and the first lower die. The material belt is pulled and beaten multiple times to flatten the thin part to 50% of the original thickness. Step 6: Dotting and forming the thin part, by stamping and dotting the thin surface; Step seven, flatten and shape, and cut off the excess part after flattening by punching with the punching block that originally punched out the elongated holes and limit grooves.

2. The stainless steel sheet parts thinning and stamping forming process according to claim 1 is characterized in that: The punching needle for punching dots has a square cross section and a stepped structure at the end, and the hole at the end is 0.05 cm.

3. The stainless steel sheet parts thinning and stamping forming process according to claim 1, characterized in that: The method also includes step eight of setting a concave die in the upper die and a convex die in the lower die, so as to simultaneously form two protrusions protruding toward the upper die in the first frame.

4. The stainless steel sheet parts thinning and stamping forming process according to claim 3 is characterized in that: The step also includes step nine, punching holes along the length direction of the first frame and the second frame on the same side of the first frame and the second frame, and then punching holes in the length direction of the other side of the first frame and the second frame after pulling the material belt, and the edges of the holes are in contact with the small dots of the first frame or the second frame.

5. The stainless steel sheet parts thinning and stamping forming process according to claim 4, characterized in that: Secondary stamping to remove burrs on the outer frame.

6. The stainless steel sheet parts thinning and stamping forming process according to claim 5, characterized in that: It also includes a Z-shaped bending process, in which the first frame, the second frame and the end of the connecting part are Z-shaped bent at the same time, and an intermediate pressure block is set by a second upper mold. An inverted U-shaped pressure block is sleeved on the upper part of the intermediate pressure block, and an elastic member is provided between the U-shaped pressure block and the intermediate pressure block. A T-shaped block is set on the second lower mold, and a plurality of groups of rotating blocks are coaxially arranged on both sides of the lower horizontal part of the T-shaped block. The rotating blocks are arranged according to different bending positions. When pressed down, the rotating blocks flip upwards, and the edge of the first frame, the edge of the second frame and the connecting part are bent at the same time.

7. The stainless steel sheet parts thinning and stamping forming process according to claim 6, characterized in that: Cut off the material strips between adjacent formed workpieces.

8. The stainless steel sheet parts thinning and stamping forming process according to claim 1, characterized in that: There are five beating stations, and the material strip is beaten once each time it is pulled through a station.

9. The stainless steel sheet parts thinning and stamping forming process according to claim 1 or 8, characterized in that: The upper die of the stamping assembly is an inclined surface, and the acute angles between the upper die of adjacent workstations and the horizontal plane are 2°, 1.5°, 1°, 0.5°, and 0°, respectively.

10. The stainless steel sheet parts thinning and stamping forming process according to claim 1 or 8, characterized in that: The thickness of the thin portion is 0.2 cm.

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