Embedded feeding stamping process

Abstract

The present invention discloses an embedded feeding punching process, comprising the following steps: step 1, taking an auxiliary material strip and feeding it into a punch press; step 2, punching out a riveting hole, a first side hole and a second side hole from the auxiliary material strip; step 3, taking a product material strip and feeding it into a punch press in a horizontal direction perpendicular to the auxiliary material strip; step 4, punching the product material strip to form a blank block and press-fitting it into the riveting hole; step 5, pre-forming and pressing down the upper surface of the blank block; step 6, locally pressing down the center of the upper surface of the blank block; step 7, punching and blanking the blank block. The present invention improves the utilization rate of the copper-aluminum composite material and reduces the waste of the copper-aluminum composite material.

Description

Technical Field

[0001] The invention relates to the field of batteries, in particular to an embedded feeding stamping process. Background Art

[0002] The pole is a component for communication between the inside and outside of the battery. One end of the pole is connected to the external circuit of the battery, and the other end is connected to the battery cell inside the battery to realize the charging and discharging function of the battery. The quality of the battery pole assembly and the manufacturing process directly affects the performance of the battery cell and even the entire battery. The negative pole in the traditional pole assembly is mostly made of copper-aluminum composite blocks, and the shell cover and the connecting plate are mostly made of pure aluminum or aluminum alloy, thereby reducing the amount of precious metal copper. The preparation of the traditional negative pole block is mainly made by continuous stamping of copper-aluminum composite strips. In order to avoid the stamping die and prevent the pole from deforming during stamping, the copper-aluminum composite strip will be punched out with guide holes and side holes. The guide holes are used to position the copper-aluminum composite strips, and the side holes are used as buffer areas when stamping the copper-aluminum composite pole block to prevent the copper-aluminum composite pole block from deforming. After the copper-aluminum composite pole block is stamped, the copper-aluminum composite strips where the guide holes and side holes are located are disposed of as waste. Therefore, this stamping process has the problem of low material utilization of the copper-aluminum composite strip. Summary of the invention

[0003] The purpose of the present invention is to provide an embedded feeding stamping process designed to solve the deficiencies of the above-mentioned technology.

[0004] The present invention designs an embedded feeding stamping process, including

[0005] Step 1, taking the auxiliary material strip and feeding it into the punch press, so that the auxiliary material strip is continuously fed forward on the punch press;

[0006] Step 2: During the process of the auxiliary material strip being fed forward in a stepwise manner, a rivet hole, two first side holes and two second side holes arranged around the rivet hole are punched out of the auxiliary material strip, the two first side holes are spaced apart along the length direction of the auxiliary material strip, and the two second side holes are spaced apart along the width direction of the auxiliary material strip, so that the two first side holes are respectively located beside two opposite first edges of the rivet hole, and the two second side holes are respectively located beside two opposite second edges of the rivet hole;

[0007] Step 3, take the product strip and feed it into the punch press in a horizontal direction perpendicular to the auxiliary strip;

[0008] Step 4: punching the product strip to form a blank block, and press-fitting the blank block into the rivet hole so that the blank block and the rivet hole form a tight fit;

[0009] Step 5: During the process of the auxiliary material belt and the blank block being fed forward step by step, the upper surface of the blank block is preformed and pressed down, so that a cylindrical lower boss is formed on the lower surface of the blank block as a positioning step for the battery column;

[0010] Step 6: When the auxiliary material belt and the blank block are fed forward step by step, the center of the upper surface of the blank block is partially pressed down, so that a cylindrical depression is formed in the center of the upper surface of the blank block, and a cylindrical protrusion facing downward is correspondingly formed in the center of the cylindrical lower boss, and the cylindrical protrusion serves as a battery column boss;

[0011] Step seven, while the auxiliary material belt and the blank block are being fed forward step by step, the blank block is punched and blanked to form a finished battery column.

[0012] Preferably, in step 2, during the stepwise forward feeding of the auxiliary material strip, guide pin holes for the guide pins of the stamping die to pass through are punched out of the auxiliary material strip, and the guide pin holes are located at the two long edges of the auxiliary material strip and are spaced apart along the length direction of the auxiliary material strip.

[0013] Further optimization, in step 2, the first side hole extends along the width direction of the auxiliary material strip to form a long strip side hole.

[0014] Further optimization, in step 2, the number of the first side holes between two adjacent riveting holes is two.

[0015] Further optimization is performed, the edge of the first side hole near the riveting hole is adapted to the inner shape of the riveting hole; the edge of the second side hole near the riveting hole is adapted to the inner shape of the riveting hole.

[0016] Preferably, in step seven, while the auxiliary material strip is being fed forward step by step together with the blank block, before forming the finished product, the blank block is first punched to form a state of incomplete punching and blanking, so as to form a preformed blank block.

[0017] Preferably, the auxiliary material strip is cold-rolled steel.

[0018] Preferably, the product strip is a strip formed by a double-layer material composite, wherein the upper layer is an aluminum layer and the lower layer is a copper layer.

[0019] Further optimization, the rivet hole is a square hole, and the center of the four inner edges thereof is provided with a clamping protrusion to clamp the blank block.

[0020] Preferably, in step seven, after blanking is completed, the auxiliary material strip with the blank block residue is cut off.

[0021] Compared with the prior art, the present invention adopts an auxiliary material strip as an auxiliary material for stamping, that is, the auxiliary material strip is stepped and transmitted, and the auxiliary material strip is punched under the stamping of the stamping die. These holes include guide pin holes, rivet holes and side holes. The guide pin holes are used to guide the guide pins of the stamping die, and play a positioning role for the auxiliary material strip, so that the auxiliary material strip can be stably stepped and transmitted, and the side holes are distributed along the rivet holes. Then, the product material strip, that is, the copper-aluminum composite material strip, is fed in a horizontal and perpendicular manner to the auxiliary material strip, and the product material strip is punched to form a blank block. The blank block is pressed into the rivet hole under the action of the stamping die, so that the blank block and the The rivet holes form an interference fit, and then the blank block is formed and stamped in steps. The side holes play a evasive role when the blank block is stamped, preventing the blank block from deforming during the forming and stamping process. Therefore, in this stamping process, the guide pin hole, the rivet hole and the side hole are all opened on the auxiliary material strip. Different from directly stamping the product material strip, the material wasted in the product material strip in the present invention is only the circumferential position where the blank block contacts the rivet hole during stamping, which improves the material utilization rate of the product material strip. The utilization rate can be increased from 40% in the traditional method to 80%, and the auxiliary material strip usually adopts cold-rolled steel strip, and the cost is much lower than that of copper-aluminum composite material strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a top view of the auxiliary material strip and the product material strip in the first embodiment;

[0023] Figure 2 is a side view structural diagram of the auxiliary material belt and the product material belt in the first embodiment;

[0024] Figure 3 is a top view of the auxiliary material strip and the product material strip in the second embodiment;

[0025] Figure 4 It is a cross-sectional structural diagram of the copper-aluminum composite block in the present invention;

[0026] Figure 5 The three-dimensional structure of the copper-aluminum composite block in the present invention Figure 1 ;

[0027] Figure 6 The three-dimensional structure of the copper-aluminum composite block in the present invention Figure 2 ;

[0028] Figure 7 It is a structural schematic diagram of the stamping die in the present invention.

[0029] In the figure: 1. Auxiliary material strip; 101. Guide pin hole; 102. First side hole; 103. Rivet hole; 104. Second side hole; 105. Boss; 2. Product material strip; 201. Blank block; 3. Copper-aluminum composite block; 301. Cylindrical lower boss; 302. Cylindrical depression; 303. Cylindrical protrusion; 304. Aluminum layer; 305. Copper layer; 4. Upper die seat; 5. Upper pad; 6. Upper clamping plate; 7. Guide pin hole punch; 8. Side hole punch; 9. Rivet hole punch; 10. Blank block punch; 11. Preformed punch set; 12. Blanking punch; 13. Stop plate; 14. Drop-off plate; 15. Lower die seat; 16. Lower template; 17. Lower pad. DETAILED DESCRIPTION

[0030] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0031] Attached Figure 7 As shown, the stamping die designed in the present invention includes an upper die base 4 and a lower die base 15, the upper die base 4 is sequentially installed with an upper pad 5, an upper clamping plate 6, a stop plate 13 and a fall-off plate 14, wherein the stop plate 13 and the fall-off plate 14 are movably connected; the lower die base 15 is sequentially installed with a lower mold plate 16 and a lower pad 17, and the upper clamping plate 6 is sequentially provided with a guide pinhole punch 7, a side hole punch 8, a rivet hole punch 9, a blank block punch 10, a pre-forming punch group 11 and a blanking punch 12.

[0032] Embodiment 1:

[0033] The specific steps of the stamping process using the above mold are as follows:

[0034] Step 1: Take the auxiliary material strip 1 and feed it into the punch press, so that the auxiliary material strip 1 is continuously fed forward on the punch press;

[0035] Step 2: During the forward feeding of the auxiliary material belt 1, Figure 1 and 2 As shown, the guide needle hole punch 7 punches out a guide needle hole 101 on the auxiliary material strip 1, so that the guide needle of the mold can pass through the guide needle hole 101, which is used to guide the guide needle. In this embodiment, the guide needle holes 101 are located at the two long edges of the auxiliary material strip 1 and are spaced apart along the length direction of the auxiliary material strip 1. The guide needle is a cylindrical structure, and the guide needle hole 101 is a corresponding circular hole. The guide needle is used to position the auxiliary material strip 1 to avoid displacement or offset of the auxiliary material strip 1 during stamping.

[0036] During the process of the auxiliary material strip 1 stepping forward, the first side hole 102 is punched into the auxiliary material strip 1 by the side hole punch 8. The first side holes 102 are spaced apart along the length direction of the auxiliary material strip 1. In the present embodiment, the first side holes 102 extend along the width direction of the auxiliary material strip 1 to form long strip-shaped side holes. The first side holes 102 are grouped in pairs, and a certain area is left between the two first side holes 102 in the same group. The guide pinhole 101 is located between two adjacent groups of first side holes 102, that is, the guide pinhole 101 is close to both ends of the first side hole 102.

[0037] During the step-by-step forward feeding process of the auxiliary material strip 1, a rivet hole 103 is punched out in the area between the two first side holes 102 of the auxiliary material strip 1 by the rivet hole punch 9, that is, the two first side holes 102 of the same group are located on the left and right sides of the rivet hole 103. In this embodiment, the rivet hole 103 is a square hole, and the four inner corners of the rivet hole 103 are rounded. A convex protrusion 105 is formed in the middle position of the four inner edges of the square rivet hole 103. The top of the convex protrusion 105 is a plane, and the four inner edges are rounded with a smooth transition. The edge of the side hole 102 close to the rivet hole 103 is adapted to the shape of the inner edge of the rivet hole 103, that is, a convex 105 is formed in the center of the inner edge of the first side hole 102 close to the rivet hole 103, and the punch corresponding to the first side hole 102 also forms a convex 105 accordingly, so that the first side hole 102 can be punched out. The purpose of such design is to minimize the area of ​​the auxiliary material strip 1 between the first side hole 102 and the rivet hole 103, and after punching the first side hole 102 and the rivet hole 103, the waste of the auxiliary material strip 1 is minimized.

[0038] During the step-by-step forward feeding process of the auxiliary material strip 1, the second side holes 104 are punched into the auxiliary material strip 1 by the side hole punch 8. The second side holes 104 are grouped in pairs, and the two second side holes 104 in the same group are opposite and symmetrically distributed along the riveting hole 103. The edge of the second side hole 104 close to the riveting hole 103 is the same as the first side hole 102, and is set to adapt to the inner edge shape of the riveting hole 103.

[0039] Step three, take the product strip 2 and feed it into the punching machine in a horizontal direction perpendicular to the auxiliary strip 1 . The product strip 2 is fed into the next station after the auxiliary strip 1 has punched the riveting holes 103 , and the product strip 2 is located above the auxiliary strip 1 .

[0040] Step 4: The product strip 2 is punched by the blank block punch 10 of the stamping die to form a blank block 201, and the blank block 201 is pressed into the rivet hole 103, so that the blank block 201 and the rivet hole 103 form an interference fit riveting, that is, the blank block 201 is embedded in the rivet hole 103 and forms a tight fit with the rivet hole 103, that is, the blank block 201 is clamped in the rivet hole 103. In this embodiment, the inner center of the rivet hole 103 A clamping protrusion 105 is provided, which extends from the inner wall of the rivet hole 103. Therefore, the four sides of the blank block 201 are tightly against the inner edge clamping protrusion 105 of the rivet hole 103, that is, a small area of ​​contact is formed with the inner edge of the rivet hole 103 to clamp the blank block 201. Not only is the riveting firm and stable, but it is also convenient for the subsequent stamping and forming of the blank block 201. At the same time, after blanking, the waste materials of the auxiliary material strip 1 and the product material strip 2 are separated from each other, which is convenient for the recovery of the product material strip 2.

[0041] Step five, while the auxiliary material strip 1 is stepping forward together with the blank block 201, the blank block 201 is pre-formed and pressed down, and a lower boss is formed on the lower surface of the blank block 201 through the pre-forming punch group 11 and the lower die seat 15 related molds. The lower boss is the positioning step of the battery column, that is, the lower boss is pressed out of the blank block 201. In this embodiment, the lower boss is a cylindrical lower boss 301.

[0042] Step 6: While the auxiliary material strip 1 and the blank block 201 are continuously fed forward, the center of the upper surface of the blank block 201 is punched. Through the joint action of the preforming punch set 11 and the related molds of the lower die holder 15, a cylindrical depression 302 is formed in the center of the upper surface of the blank block 201, as shown in FIG. Figure 6 As shown, the cylindrical lower boss 301 forms a corresponding cylindrical protrusion 303, which serves as a convex column of the battery column and is usually a cylindrical convex column.

[0043] Step seven, the auxiliary material strip 1 together with the blank block 201 continue to step forward, and the blank block 201 is half-sheared by the preforming punch group 11, that is, the pressing depth of the preforming punch group 11 does not reach the material thickness of a product, and the blank block 201 is not completely cut off and blanked, only a preformed product is formed, and the preformed product does not separate from the auxiliary material strip 1. During the process of the auxiliary material strip 1 and the preformed blank block 201 stepping forward, the half-sheared blank block 201 is completely cut off and blanked to form a finished copper-aluminum composite block 3.

[0044] like Figure 4 and 5 As shown, the product strip 2 is a strip formed by a double-layer material composite, the upper layer is an aluminum layer 304, and the lower layer is a copper layer 305. Its specifications are a strip with a thickness of 3.8 mm, a width of 25 mm, and a pitch of 27 mm.

[0045] The auxiliary material strip 1 is cold-rolled steel. The cost of cold-rolled steel of the same size is much lower than that of copper and aluminum materials. Compared with the case without the auxiliary material strip 1, directly stamping the product material strip 2 will result in serious material waste. In this embodiment, the specifications of the auxiliary material strip 1 adopt a material strip shape with a thickness of 0.5 mm, a width of 52 mm, and a pitch of 31.5 mm.

[0046] After the blanking is completed, the auxiliary material strip 1 with the residual material of the blank block 201 is cut off for easy recycling, thus forming a fully automated stamping process.

[0047] It should be noted that the four inner corners of the rivet hole 103 are rounded with smooth transition to form arc corners, so as to avoid adhesion between the punch and the four inner corners of the rivet hole 103 during full punching.

[0048] Embodiment 2:

[0049] The basic content is the same as that of the first embodiment, except that the riveting hole 103 is a square hole. Figure 3 As shown, the inner edge is a straight edge, and the first side hole 102 extends along the width direction of the auxiliary material strip 1 to form a long strip of side hole. The number of first side holes 102 between two adjacent rivet holes 103 is one, that is, the rivet holes 103 and the first side holes 102 are distributed at intervals, or it can be understood that the two first side holes 102 on the same side are combined into one to form a first side hole 102, and accordingly, the left and right sides of the first side hole 102 are also straight edges to reduce the waste of the product material strip 2 during stamping.

[0050] In step 2, the guide pin hole 101 is first punched out of the auxiliary material strip 1, and then the side holes are punched out. When punching the side holes, the first side hole 102 can be punched out first, and then the second side hole 104 can be punched out, or the second side hole 104 can be punched out first, then the first side hole 102, and finally the rivet hole 103 can be punched out.

[0051] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. Embedded feeding stamping process, characterized in that: include Step 1, taking the auxiliary material strip (1) and feeding it into the punching machine, so that the auxiliary material strip (1) is continuously fed forward in steps on the punching machine; Step 2: During the process of the auxiliary material strip (1) being fed forward in a stepwise manner, a rivet hole (103) and two first side holes (102) and two second side holes (104) arranged around the rivet hole (103) are punched out of the auxiliary material strip (1), the two first side holes (102) being spaced apart along the length direction of the auxiliary material strip (1), and the two second side holes (104) being spaced apart along the width direction of the auxiliary material strip (1), so that the two first side holes (102) are respectively located beside two opposite first edges of the rivet hole (103), and the two second side holes (104) are respectively located beside two opposite second edges of the rivet hole (103); Step 3, taking the product strip (2) and feeding it into the punch press in a horizontal direction perpendicular to the auxiliary strip (1); Step 4, punching the product strip (2) to form a blank block (201), and pressing the blank block (201) into the rivet hole (103) so that the blank block (201) and the rivet hole (103) form a tight fit; Step 5: During the process of the auxiliary material belt (1) and the blank block (201) being fed forward step by step, the upper surface of the blank block (201) is preformed and pressed down, so that a cylindrical lower boss (301) is formed on the lower surface of the blank block (201) as a battery column positioning step; Step 6: When the auxiliary material belt (1) and the blank block (201) are being fed forward step by step, the center of the upper surface of the blank block (201) is locally pressed downward, so that a cylindrical depression (302) is formed in the center of the upper surface of the blank block (201), and a cylindrical protrusion (303) facing downward is correspondingly formed in the center of the cylindrical lower boss (301), and the cylindrical protrusion (303) serves as a battery column boss; Step seven, while the auxiliary material belt (1) and the blank block (201) are being fed forward step by step, the blank block (201) is punched and blanked to form a finished battery column.

2. The embedded feeding stamping process according to claim 1 is characterized in that: In step 2, during the process of the auxiliary material strip (1) being fed forward in steps, guide pin holes (101) are punched out of the auxiliary material strip (1) for the guide pins of the stamping die to pass through. The guide pin holes (101) are located at the two long edges of the auxiliary material strip (1) and are spaced apart along the length direction of the auxiliary material strip (1).

3. The embedded feeding stamping process according to claim 2 is characterized in that: In step 2, the first side hole (102) extends along the width direction of the auxiliary material strip (1) to form a long strip-shaped side hole.

4. The embedded feeding stamping process according to claim 2 is characterized in that: In step 2, the number of the first side holes (102) between two adjacent riveting holes (103) is two.

5. The embedded feeding stamping process according to claim 4 is characterized in that: The edge of the first side hole (102) near the riveting hole (103) is adapted to the inner shape of the riveting hole (103); the edge of the second side hole (104) near the riveting hole (103) is adapted to the inner shape of the riveting hole (103).

6. The embedded feeding stamping process according to claim 1, characterized in that: In step seven, while the auxiliary material belt (1) and the blank block (201) are being fed forward step by step, before the finished product is formed, the blank block (201) is first punched to form a state where the blank is not completely cut off, so as to form a preformed blank block (201).

7. The embedded feeding stamping process according to claim 1 is characterized in that: The auxiliary material strip (1) is cold-rolled steel.

8. The embedded feeding stamping process according to claim 1, characterized in that: The product strip (2) is a strip formed by a double-layer material composite, wherein the upper layer is an aluminum layer (304) and the lower layer is a copper layer (305).

9. The embedded feeding stamping process according to claim 5, characterized in that: The riveting hole (103) is a square hole, and the four inner edges thereof are centrally provided with clamping protrusions (105) for clamping the blank square block (201).

10. The embedded feeding stamping process according to claim 1, characterized in that: In step seven, after the blanking is completed, the auxiliary material strip (1) with the remaining blank block (201) is cut.

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