A connectionless scrap forming die and forming method for a bent piece

Abstract

The present application belongs to the technical field of stamping processing, and relates to a forming die and a forming method for a bending piece without connecting waste, wherein the forming die comprises, in sequence along the feeding direction of the material belt, a punching station, a shaping station, a blanking station and a bending station. The blanking station comprises a profiled supporting block arranged floatingly up and down, a profiled pressing block for pressing the material belt against the profiled supporting block, and a blanking punch located at the material outlet side of the profiled pressing block. The bending station comprises a first bending punch located at the material outlet side of the blanking punch, a pressing punch closely attached to the material outlet side of the first bending punch, and a second bending punch closely attached to the material outlet side of the pressing punch. The bending station further comprises a supporting block located below the pressing punch, and the highest point of the supporting block is at the same height as the supporting surface of the profiled supporting block. The present method can utilize the through hole originally present on the bending piece for positioning. After the first end of the material belt is cut off, the bending is immediately completed at the bending station. The present method is not only accurate in processing, but also does not produce connecting waste in production, thereby saving material cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stamping processing, in particular to a connecting-waste-free forming die for a bent part. BACKGROUND

[0002] Metal stamping is a common process for processing many metal products. With the diversification of customer needs, the design of the die also needs to meet various product needs. Figure 1 As shown in a bent part 1, which has a transition surface 11, a first bent surface 12 on one side of the transition surface 11, and a second bent surface 13 on the other side of the transition surface 11, there are some holes on the transition surface 11, the first bent surface 12 and the second bent surface 13. The bent part 1 is generally bent from a rectangular structure of material.

[0003] Referring to Chinese patent CN201620695711.X, a double-row continuous die for an automobile back seat cushion framework support, the processing method is: until the transition surface 11 is connected to the continuous part of the web-shaped material strip as a reference surface before blanking, and the positioning hole is cut out on the continuous part as a positioning basis. After punching in the processing range, the profile of the first bent surface 12 before deformation and the profile of the second bent surface 13 before deformation are cut out on the inside of the material strip, and then the first bent surface 12 and the second bent surface 13 are formed by bending.

[0004] Referring to Chinese patent CN202220767713.0, a die for continuous stamping of a cover water disc support, the processing method is: taking the transition surface 11 as a reference surface, leaving a small amount of connecting material between the transition surfaces 11 and cutting out positioning holes as positioning references. After punching in the processing range, the profile of the first bent surface 12 before deformation and the profile of the second bent surface 13 before deformation are cut out on both sides of the material strip, but there is no continuous part on the outside, forming a butterfly-shaped structure, and then the first bent surface 12 and the second bent surface 13 are formed by bending.

[0005] No matter which way is adopted, it is inevitable to design a gap between the product forming areas, and the continuous part or connecting material between the gaps is waste material that needs to be cut off, which will result in a low practical area of the material strip and increase the processing cost.

[0006] Therefore, it is necessary to design a new forming method to reduce the waste of material strip material. SUMMARY

[0007] The main purpose of the present application is to provide a connecting-waste-free forming die for a bent part, which can avoid the waste of connecting material on the material strip and reduce the cost of raw materials.

[0008] The present application realizes the above-mentioned purpose through the following technical scheme: a connectionless waste forming die for a bent piece, comprising a punching station, a shaping station and a blanking station arranged in sequence along the feeding direction of a material belt, the blanking station comprising a profiled supporting block arranged floatingly upward and downward, a profiled pressing block for pressing the material belt against the profiled supporting block, and a blanking punch located at the material outlet side of the profiled pressing block, a bending station being arranged at the material outlet side of the blanking station, the bending station comprising a first bending punch located at the material outlet side of the blanking punch, a pressing punch closely arranged at the material outlet side of the first bending punch, and a second bending punch closely arranged at the material outlet side of the pressing punch, the bending station further comprising a supporting block located below the pressing punch, the highest point of the supporting block being in the same height as the supporting surface of the profiled supporting block.

[0009] Specifically, the supporting block is a side core-pulling component extending into the lower side of the pressing punch in the vertical direction of the material belt feeding direction, and the side of the supporting block is provided with a stop block for allowing the supporting block to be separated from the bent piece.

[0010] Further, the forming die comprises an upper die and a lower die, the upper die is provided with a fixed block, the second bending punch is arranged floatingly horizontally on the fixed block, the second bending punch has a protruding portion near the lower edge of the supporting block, the supporting block has an inclined surface matched with the protruding portion, the second bending punch has an inclined surface away from the lower edge of the supporting block, the lower die is provided with an inclined punch matched with the inclined surface, when the inclined punch contacts the inclined surface, the protruding portion is close to the inclined surface to complete a bending action greater than 90°.

[0011] Further, the second bending punch is arranged on the fixed block through an elastic floating assembly, the elastic floating assembly comprises a bolt crossing the fixed block, a spring sleeve passing through the bolt, and a spring sleeved on the spring sleeve, the end of the bolt is connected to the side surface of the second bending punch, and the two ends of the spring are respectively abutted against the fixed block and the spring sleeve.

[0012] Further, the lower part of the second bending punch is provided with an avoiding groove.

[0013] Further, the material outlet side of the profiled supporting block is floatingly provided with a flanging punch, the top of the flanging punch is provided with a flanging protruding portion with the material outlet side higher than the material inlet side, and the profiled pressing block is concave at the position corresponding to the flanging protruding portion.

[0014] Further, the bottom of the blanking punch is provided with a stepped surface matched with the top surface of the flanging protruding portion.

[0015] The connectionless waste forming method using the forming die comprises the following steps:

[0016] S1. Punching through holes: Using the two sides of the strip as positioning references, punch several structural holes on the surface of the strip using the punching station.

[0017] S2. Shaping: Using one of its structural holes as a reference, the strip is shaped using the shaping station.

[0018] S3. Blanking and Bending: Using one of its structural holes as a reference, the first end of the strip extends beyond the blanking station and into the bending station. The middle part of the strip is pressed down by the contour block and the contour pressure block. The pressing punch and the contour block clamp the first end of the strip. The blanking punch cuts the strip between the first end and the middle part. Then, the first end of the strip is folded into a U-shaped bending part by the first bending punch and the second bending punch.

[0019] Specifically, the blanking and bending step uses a side-pulling core structure support block. The support block extends vertically from the conveyor belt direction to below the pressing punch. After the bending is completed, the support block is pulled out horizontally to allow the bent part to fall.

[0020] Specifically, the blanking and bending step uses a flanging punch to punch an upward-curving part at the front of the cut strip.

[0021] The beneficial effects of the technical solution of this invention are:

[0022] This method utilizes the existing through holes on the bent parts for positioning. After the first end of the strip is cut off, the bending is completed immediately at the bending station. This not only ensures precise processing but also eliminates connection waste during production, saving material costs. Attached Figure Description

[0023] Figure 1 This is the front view of the bent part;

[0024] Figure 2 This is a diagram showing the sequence of material changes;

[0025] Figure 3 This is a partial structural diagram of the shaping station and blanking station before mold closing;

[0026] Figure 4 This is a partial structural diagram of the forming station and blanking station after mold closing.

[0027] The diagram is marked as follows:

[0028] 1-Bent part, 11-Transition surface, 12-First bending surface, 13-Second bending surface, 131-Warped part, 14-Structural hole, 10-Material strip;

[0029] 2- Blanking station, 21- Contouring support block, 22- Contouring pressing block, 23- Blanking punch, 231- Step surface, 24- Flanging punch, 241- Flanging protrusion;

[0030] 3-Bending station, 31-First bending punch, 32-Pressure punch, 33-Second bending punch, 331-Protrusion, 332-Bevel, 333-Allowing groove, 34-Support block, 35-Fixing block, 36-Elastic floating component, 361-Bolt, 362-Spring sleeve, 363-Spring, 37-Bevel punch, 38-Stop block. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to specific embodiments.

[0032] Example:

[0033] like Figures 1 to 4 As shown, a non-connecting waste forming mold for bending parts according to the present invention includes a punching station (not shown), a shaping station (not shown), and a blanking station 2 arranged sequentially along the feeding direction of the strip 10. The blanking station 2 includes a contouring support block 21 that is floating up and down, a contouring pressure block 22 for pressing the strip 10 onto the contouring support block 21, and a blanking punch 23 located on the discharge side of the contouring pressure block 22. A bending station 3 is provided on the discharge side of the blanking station 2. The bending station 3 includes a first bending punch 31 located on the discharge side of the blanking punch 23, a pressure punch 32 closely attached to the discharge side of the first bending punch 31, and a second bending punch 33 closely attached to the discharge side of the pressure punch 2. The bending station 3 also includes a support block 34 located below the pressure punch 32. The highest point of the support block 34 is equal to or higher than the support surface of the contouring support block 21. Before blanking, the first end of the strip 10 extends horizontally above the support block 34. The support block 34 serves as a support component for part of the material on the transition surface 11. After the blanking punch 32 presses down on part of the material on the transition surface 11, the first bending punch 31 and the second bending punch 33 on both sides complete the bending. Because the structural hole 14 located at the blanking station 2 is used as the positioning reference before bending, and the first end of the strip 10 is cut off and immediately bent at the bending station 3, the entire processing process does not need to rely on connecting material to set the positioning hole, which also ensures processing accuracy. Apart from the waste generated by punching, no connecting waste is generated between adjacent bent parts 1, so material costs are saved.

[0034] like Figure 3 and Figure 4 As shown, the support block 34 is a side-pulling component that extends vertically into the area below the pressing punch 32 from the direction of the conveyor belt. A stop block 38 is provided on the side of the support block 34 to allow it to be pulled away from the bending piece 1. Because the bending piece 1 still needs to be unloaded after bending, a side-pulling component is used as the support block 34. After bending, the bending piece 1 hangs on the support block 34, but the support block 34 retracts into the stop block 38. At this point, the bending piece 1 is blocked by the stop block 38 and detaches from the support block 34, completing the unloading process.

[0035] like Figure 3 and Figure 4 As shown, the forming mold includes an upper mold and a lower mold. The upper mold is provided with a fixed block 35. A second bending punch 33 is horizontally floating on the fixed block 35. The second bending punch 33 has a protrusion 331 near the lower edge of the support block 34. The support block 34 has an inclined surface (not labeled) that matches the protrusion 331. The second bending punch 33 has an inclined surface 332 on the lower edge away from the support block 34. The lower mold is provided with a slanted punch 37 that matches the inclined surface 332. When the slanted punch 37 contacts the inclined surface 332, the protrusion 331 moves closer to the inclined surface to complete a bending action greater than 90°. Because this structure allows the second bending punch 33 to not only descend but also have an additional horizontal displacement, forming an inclined movement path, a bending angle greater than 90° can be completed using the protrusion 331. Because the feeding side of the support block 34 is restricted by the unloading station 2, the second bending surface 13 can only be set on the unloading side when the bending angle exceeds 90°.

[0036] like Figure 3 and Figure 4 As shown, the second bending punch 33 is mounted on the fixed block 35 via an elastic floating assembly 36. The elastic floating assembly 36 includes a bolt 361 passing through the fixed block 35, a spring sleeve 362 passing through the bolt 361, and a spring 363 fitted onto the spring sleeve 362. The end of the bolt 361 is connected to the side of the second bending punch 33, and the two ends of the spring 363 abut against the fixed block 35 and the spring sleeve 362, respectively. Before the inclined surface 332 touches the inclined punch 37, the second bending punch 33 will move closer to the fixed block 35 under the action of the spring 363. This achieves the material removal requirement of the second bending punch 33.

[0037] like Figure 3 and Figure 4 As shown, the lower part of the second bending punch 33 is provided with a relief groove 333. Because there may be protruding structures (including pull-up holes and raised parts 131) on the second bending surface 13, and the second bending punch 33 cannot touch these protruding structures and collapse them before completing the bending, the relief groove 333 is provided to avoid these protruding structures.

[0038] like Figures 1 to 4As shown, a flanging punch 24 is floatingly provided on the discharge side of the contour support block 21. The top of the flanging punch 24 has a flanging protrusion 241 on the discharge side that is higher than the feed side. The contour pressing block 22 is recessed at the position corresponding to the flanging protrusion 241. In the embodiment, the bending part 1 also has a raised part 131 at the end of the second bending surface 13. Therefore, it can be bent at the same time as the blanking punch 23 cuts off the beginning end of the material strip 10. Since the new beginning end still needs to be higher than the highest point of the support block 34, the flanging punch 24 needs to be set on one side of the contour support block 21 of the lower die and bend the raised part 131 upward.

[0039] like Figure 3 and Figure 4 As shown, the bottom of the blanking punch 23 is provided with a stepped surface 231 that matches the top surface of the flange protrusion 24. During flangeing, the beginning of the strip 10 will retract due to the flange, so the cutting surface of the blanking punch 23 must be separated from the contouring block 22 by a distance to form a stepped surface 231. When the mold is fully closed, the stepped surface 231 will contact the top surface of the flange protrusion 24 and fit tightly together.

[0040] like Figures 1 to 4 As shown, the principle of the non-connected waste forming method using forming molds is as follows:

[0041] S1. Punching Through Holes: Using both sides of the strip 10 as positioning references, several structural holes 14 are punched on the surface of the strip using the punching station. The structural holes 14 are the hole-shaped structures required on the bent part 1, and are also used as positioning holes in this process to accurately position the subsequent processing.

[0042] S2. Shaping: Using one of its structural holes 14 as a reference, the strip 10 is shaped using a shaping station. If the bent part 1 has a protruding structure, this step can be performed on the strip 10 to obtain the desired structure.

[0043] S3. Blanking and Bending: Using the structural hole 14 as a reference, the beginning of the strip 10 extends beyond the blanking station 2 and into the bending station 3. The middle of the strip 10 is pressed down by the contour block 21 and the contour pressure block 22. The pressure punch 32 and the support block 34 clamp the beginning of the strip 10. The blanking punch 23 cuts the strip 10 between the beginning and the middle. Then, the beginning of the strip 10 is folded into a U-shaped bent part 1 by the first bending punch 31 and the second bending punch 33. The blanking station 2 and the bending station 3 are actually combined to complete a series of continuous processes. That is, blanking and bending are completed in one stamping operation. Both steps are based on the positioning of the structural hole 14.

[0044] like Figure 3 and Figure 4As shown, the blanking and bending step uses a side-pulling core support block 34. The support block 34 extends vertically from the conveying direction of the material belt 10 to below the pressing punch 32. After bending is completed, the support block 34 is pulled out horizontally, causing the bent part 1 to fall. The support block 34 only extends when bending is required, and after bending is completed, the support block 34 is pulled away to allow the bent part 1 to fall below the bending station 3.

[0045] like Figures 1 to 4 As shown, the blanking and bending step uses the flanging punch 24 to punch an upward-curving part 131 at the front of the cut strip 10. This step is for cases where there is still a curved part 131 on the second bending surface 13, and the required curved part 131 can be obtained without adding a work station.

[0046] The above descriptions are merely some embodiments of the present invention. Those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A non-connecting scrap forming mold for bent parts, comprising a punching station, a shaping station, and a blanking station arranged sequentially along the feeding direction of the strip, wherein the blanking station includes a contouring block that floats vertically, a contouring pressure block for pressing the strip onto the contouring block, and a blanking punch located on the discharge side of the contouring pressure block, characterized in that: The blanking station has a bending station on the discharge side. The bending station includes a first bending punch located on the discharge side of the blanking punch, a pressing punch close to the discharge side of the first bending punch, and a second bending punch close to the discharge side of the pressing punch. The bending station also includes a support block located below the pressing punch. The highest point of the support block is at the same height as the support surface of the conforming support block. The support block is a side-pulling component extending vertically into the area below the pressing punch from the direction of the conveyor belt. A stop block is provided on the side of the support block to allow it to be pulled away from the bending member. The bending member has a transition surface, a first bending surface on one side of the transition surface, and a second bending surface on the other side of the transition surface. The support block is a support component for a portion of the material on the transition surface. The forming die includes an upper die and a lower die. The upper die has a fixing block. The second bending punch is horizontally floating on the fixing block. The second bending punch has a protrusion near the lower edge of the support block. The support block has an inclined surface that matches the protrusion. The second bending punch has an inclined surface at the lower edge of the support block away from the second bending punch. The lower die is provided with an inclined punch that matches the inclined surface. When the inclined punch contacts the inclined surface, the protrusion moves closer to the inclined surface to complete a bending action greater than 90°. A flanging punch is floatingly provided on the discharge side of the contour support block. The top of the flanging punch has a flanging protrusion on the discharge side that is higher than the feed side. The contour pressing block is recessed at the position corresponding to the flanging protrusion. The bottom of the blanking punch has a stepped surface that matches the top surface of the flanging protrusion. The structural hole is a hole-shaped structure that needs to exist on the bent part. Taking one of the structural holes as a reference, the first end of the strip extends beyond the blanking station and into the bending station. The middle part of the strip is pressed down by the contour block and the contour pressure block. The pressing punch and the block clamp the first end of the strip. The blanking punch cuts the strip between the first end and the middle part. Then, the first end of the strip is folded into a U-shaped bent part by the first bending punch and the second bending punch.

2. The non-connecting waste forming mold for bent parts according to claim 1, characterized in that: The second bending punch is connected to the fixed block by a bolt that passes through the fixed block. A spring sleeve is also provided on the bolt. A spring for realizing the horizontal floating of the second bending punch is provided on the spring sleeve. The two ends of the spring abut against the fixed block and the spring sleeve, respectively.

3. The non-connecting waste forming mold for bent parts according to claim 1, characterized in that: The lower part of the second bending punch is provided with a clearance groove.

4. A method for forming seamless waste using the molding die described in claim 1 or 2, characterized in that: step include: S1. Punching through holes: Using the two sides of the strip as positioning references, punch several structural holes on the surface of the strip using the punching station. S2. Shaping: Using one of its structural holes as a reference, the strip is shaped using the shaping station. S3. Blanking and Bending: Using one of its structural holes as a reference, the first end of the strip extends beyond the blanking station and into the bending station. The middle part of the strip is pressed down by the contour block and the contour pressure block. The pressing punch and the contour block clamp the first end of the strip. The blanking punch cuts the strip between the first end and the middle part. Then, the first end of the strip is folded into a U-shaped bending part by the first bending punch and the second bending punch.

5. The method for forming seamless waste material according to claim 4, characterized in that: The blanking and bending step uses a side-pulling core structure support block. The support block extends from the vertical direction of the material conveying direction to the bottom of the pressing punch. After the bending is completed, the support block is pulled out horizontally to make the bent part fall.

6. The method for forming seamless waste material according to claim 4, characterized in that: The blanking and bending step uses a flanging punch to punch an upward-curving part at the front of the cut strip.

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