Cutting and hole flanging composite die

Abstract

The invention discloses a cutting and hole flanging composite die which is characterized in that an upper die comprises an upper supporting plate and an upper die base, and a material chopping knife, an upper folding knife and an upper stripping plate are fixedly connected to the upper die base; the cutting edge part of the material chopping knife is positioned below the upper folding knife; the upper stripping plate is positioned on the outer sides of the material chopping knife and the upper folding knife; the lower die comprises a lower supporting plate and a lower die base, and a lower die cutter and a hole flanging female die are arranged on the lower die base. The lower die cutter can move up and down relative to the lower die holder; during forming, the upper die moves downwards, after the upper stripping plate presses a product, the material chopping knife and the lower die knife are matched to cut off connecting waste in a hole of the product, and the waste falls down; the upper die continues to move downwards, the lower die cutter moves downwards to avoid the to-be-flanged hole part of the product, and the upper folding cutter is matched with the hole flanging female die to achieve hole flanging forming of the to-be-flanged hole part; and closing the die to finish hole flanging and forming. According to the cutting and hole flanging composite die, cutting of connecting waste in a middle hole of a product and hole flanging forming can be achieved, a set of die does not need to be independently arranged, die design and manufacturing cost can be reduced, machining efficiency is improved, and accumulative errors are reduced.

Description

Technical Field

[0001] This invention belongs to the field of stamping die technology, specifically relating to a cutting and turning composite die that integrates waste material removal and hole turning into the same die. Background Technology

[0002] For example Figure 1 , Figure 2 The sheet metal product 1 shown has a relatively large central hole 1.1 in both length and width. When processing this type of product with the hole, if all the material corresponding to the central hole 1.1 is cut off in the first stage, the product's stability cannot be guaranteed, easily causing product distortion and leading to a higher scrap rate. Therefore, in the first stage, the material corresponding to the central hole is usually not cut off entirely, but a portion of connecting scrap 1.2 is left as support, such as... Figure 3 As shown, to ensure product stability, this continuous waste material 1.2 is finally cut off and dropped before the hole is turned over.

[0003] In the existing technology, the cutting and drilling of connecting waste materials are processed separately using a set of molds. This not only wastes a lot of time and costs, but also increases manufacturing and R&D costs by manufacturing and designing multiple sets of molds. Furthermore, after the parts are tooled and processed by multiple sets of molds, the processing errors will gradually accumulate, reducing the precision of the product, making it difficult to guarantee the quality of the product, and hindering market competitiveness.

[0004] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0005] This invention proposes a composite mold for cutting and turning holes, which can solve the problems in the prior art where the cutting of waste material inside the hole and the turning hole processing require separate molds, resulting in high mold costs and large cumulative processing errors leading to low product precision.

[0006] To achieve the goal of solving the above-mentioned technical problems, the present invention adopts the following technical solution: A cutting and flanging composite mold, comprising: The upper mold includes an upper support plate and an upper mold base. A cutting blade, an upper folding blade, and an upper ejector plate connected to the upper mold base via an elastic floating connection structure are fixedly connected to the upper mold base. The cutting edge of the cutting blade is located below the upper folding blade, and the upper ejector plate is located outside the cutting blade and the upper folding blade. The lower mold includes a lower support plate and a lower mold base. The lower mold base is provided with a lower mold cutter corresponding to the cutting blade. A flanging die corresponding to the upper folding blade is fixedly provided on the lower mold base. The lower mold cutter can move up and down relative to the lower mold base. The lower mold cutter is located inside the flanging die. In the horizontal direction, there is a clearance between the lower mold cutter and the forming surface of the flanging die to avoid the flanging edge of the product when the lower mold cutter is reset after flanging. During molding, the upper mold moves downwards. After the upper ejector plate presses down on the product, the cutting blade and the lower mold blade work together to cut off the connecting waste material inside the hole of the product, and the waste material falls down. The upper mold continues to descend, the lower mold cutter moves down to avoid the part of the product to be turned over, and the upper folding cutter cooperates with the turning die to realize the turning over forming of the part of the product to be turned over; The mold is closed, the flanging process is completed, and the flanged edge is formed inside the product hole.

[0007] In some embodiments of this application, the lower die cutter includes two reinforcing portions located on both sides of its cutting edge, and the two reinforcing portions are arranged along the extension direction of the cutting edge.

[0008] In some embodiments of this application, nitrogen springs are connected below the two reinforcing parts to enable the lower die cutter to move up and down relative to the lower die base.

[0009] In some embodiments of this application, a guide component is provided around the lower die cutter to guide the up-and-down movement of the lower die cutter.

[0010] In some embodiments of this application, a limiting structure is formed on the top of the guide member to help limit the maximum stroke of the lower die cutter moving upward.

[0011] In some embodiments of this application, a limiting block that protrudes vertically upward to the upper part of the lower die is fixed on the reinforcing part, and a limiting groove that is correspondingly and compatible with the limiting block is formed on the upper folding die; Before the cutting blade engages with the lower die, the limiting block begins to insert into the limiting groove. After the connecting waste is cut off and before the upper folding blade engages with the turning die, the limiting block reaches a position abutting against the bottom surface of the limiting groove to hold the upper folding blade in place. As the upper die continues to descend, the upper folding blade drives the lower die to move downward through the limiting block to avoid the turning part of the product.

[0012] In some embodiments of this application, the reinforcing part and the limiting block are provided with mutually cooperating mounting and positioning structures.

[0013] Nitrogen springs are connected to the lower part of each of the two reinforcing parts. The upper folding blade compresses the nitrogen springs synchronously as the lower die blade moves downward through the limiting block.

[0014] In some embodiments of this application, an upper pad is fixedly provided on the bottom surface of the upper mold base, the upper folding blade is fixedly provided on the upper pad, the upper folding blade has a positioning hole adapted to the cutting blade, and the cutting blade passes through the positioning hole and is fixedly provided on the upper pad.

[0015] In some embodiments of this application, the flanging die includes a fixed base and a flanging die body, the flanging die body and the fixed base are fixedly connected as one unit, and the fixed base is fixedly connected to the lower die base.

[0016] In some embodiments of this application, the bottom of the piercing die body is formed with a notch to allow the lower die to move up and down.

[0017] Compared with the prior art, the advantages and positive effects of the present invention are: 1. This invention provides a cutting and flanging composite mold. An upper mold base is equipped with a cutting blade and an upper folding blade, the cutting edge of which is located below the upper folding blade. A lower mold base is correspondingly equipped with a lower mold blade and a flanging die. The lower mold blade can move up and down relative to the lower mold base. The lower mold blade is located inside the flanging die, and in the horizontal direction, there is a clearance between the lower mold blade and the forming surface of the flanging die to avoid the flanging edge of the product when the lower mold blade resets after flanging. After the upper ejector plate presses down on the product, as the upper mold moves downward, the cutting blade and the lower mold blade cooperate to cut the product. The waste material inside the hole of the product is removed, the upper mold continues to move downwards, the lower mold cutter moves down to avoid the part of the product to be turned over, and the upper folding cutter cooperates with the turning die to realize the turning of the part to be turned over; thus, the cutting and turning composite mold of the present invention can realize the removal of the waste material inside the middle hole of the product and the turning of the middle hole after the waste material is removed, without the need to set up a separate mold, which is conducive to reducing the mold design and manufacturing cost, improving processing efficiency, reducing cumulative error, improving product precision, ensuring product quality, and improving product market competitiveness; 2. By using the cutting and turning composite mold of the present invention, for the turning of sheet metal products with large central hole size, the material corresponding to the central hole in the previous process does not need to be completely cut off, but the connecting waste is retained as support. The connecting waste is then removed in the cutting and turning composite mold of the present invention, thereby ensuring product stability and reducing scrap rate. 3. By fixing a limiting block on the reinforcing part of the lower die cutter and forming a corresponding limiting groove on the upper folding cutter, the limiting block is inserted into the limiting groove before the cutting blade and the lower die cutter cooperate. Through the cooperation of the limiting block and the limiting groove, the lateral force of the cutting blade and the lower die cutter can be offset, and the continuous material residue is prevented from being stretched during the cutting process. This ensures that the continuous waste material can be cut off smoothly and instantly, further ensuring that the bending edge of the hole is flat after the hole is turned, and improving the hole forming quality. It is especially suitable for the hole turning of large-size intermediate holes in sheet metal products that require a small hole edge width. 4. After the connecting waste is cut off and before the upper folding knife and the piercing die are engaged, the limiting block reaches the position where it abuts against the bottom surface of the limiting groove to hold the upper folding knife. As the upper die continues to descend, the upper folding knife is pressed down by the limiting block and the lower die knife moves down to avoid the part of the product to be pierced. This ensures that the lower die knife does not interfere with the engagement of the upper folding knife and the piercing die to pierce, and ensures the smooth forming of the piercing after the connecting waste is cut off.

[0018] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the front view of a sheet metal product with a large length and width central hole after it has been turned over. Figure 2 This is a schematic diagram of the back view of a sheet metal product with a large length and width central hole after the hole has been turned. Figure 3 This is a schematic diagram of a sheet metal product structure with connecting waste material left in the middle hole; Figure 4 This is a schematic diagram of a cutting and flanging composite mold in the mold opening state according to an embodiment of the present invention; Figure 5 yes Figure 4 Enlarged view of part A; Figure 6 yes Figure 4 Enlarged view of part B; Figure 7 This is a schematic diagram of a partial structure of a cutting and perforating composite mold when the upper mold descends to contact the product with the upper ejector plate, according to an embodiment of the present invention. Figure 8 This is a schematic diagram of a partial structure of a cutting and flanging composite mold when the upper mold descends to the limit block and enters the limit groove in an embodiment of the present invention; Figure 9 This is a partial structural diagram of a cutting and turning composite mold in an embodiment of the present invention, when the upper mold descends to the position where the connecting waste is cut off and the limiting block abuts against the bottom surface of the limiting groove. Figure 10 This is a schematic diagram of a partial structure of a cutting and turning composite mold in an embodiment of the present invention, when the lower die cutter moves down to avoid the turning part of the product as the upper die moves down; Figure 11 This is a schematic diagram of a partial structure of a cutting and flanging composite mold in an embodiment of the present invention when the mold is closed and the flanging is completed; Figure 12 This is a schematic diagram of the relative positions of the lower die cutter and the cutting blade on the product when they work together in an embodiment of the present invention.

[0021] Figure label: 1. Product; 1.1. Center hole; 1.2. Connecting waste; 1.3. Flanged edge; 1.4. Part to be flanged; 1.5. Bending edge; 100. Upper mold; 110. Upper mold base; 111. Stepped hole; 120. Upper support plate; 130. Upper mold leg; 140. Cutting blade; 141. Cutting blade edge; 150. Upper folding blade; 151. Limiting groove; 152. Positioning hole; 160. Upper ejector plate; 161. Upper ejector plate fixing seat; 162. Upper ejector plate body; 170. Spring; 180. Shoulder screw; 190. Upper pad; 200. Lower mold; 210. Lower mold base; 220. Lower support plate; 230. Lower mold leg; 240. Lower mold cutter; 241. Lower mold cutter edge; 242. Reinforcing part; 243. Step part; 250. Flipping die; 251. Fixed base; 252. Flipping die body; 253. Notch part; 254. Forming surface; 260. Clearance clearance; 270. Guide component; 271. Protrusion; 280. Limiting block; 290. Nitrogen spring; 300. Guide post and guide sleeve structure. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. In the description of embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0025] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0026] In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0027] Reference Figures 4 to 12 In some embodiments of this application, a cutting and flanging composite mold is proposed, including an upper mold 100 and a lower mold 200.

[0028] The upper mold 100 includes an upper support plate 120 and an upper mold base 110. The upper mold base 110 is located below the upper support plate 120 and can be directly fixedly connected to the upper support plate 120, or connected to the upper support plate 120 through upper mold legs 130. A cutting blade 140, an upper folding blade 150, and an upper ejector plate 160 connected to the upper mold base 110 via an elastic floating connection structure are fixedly connected to the upper mold base 110. The cutting edge 141 of the cutting blade is located below the upper folding blade 150, and the upper ejector plate 160 is located outside the cutting blade 140 and the upper folding blade 150. The lower mold 200 includes a lower support plate 220 and a lower mold base 210. The lower mold base 210 is located above the lower support plate 220 and can be directly fixedly connected to the lower support plate 220 or connected to the lower support plate 220 through the lower mold legs 230. The lower mold base 210 is provided with a lower mold cutter 240 corresponding to the cutting blade 140, and a flanging die 250 corresponding to the upper folding blade 150 is fixedly provided on the lower mold base 210. The lower mold cutter 240 can move up and down relative to the lower mold base 210. The lower mold cutter 240 is located inside the flanging die 250, and in the horizontal direction, there is a clearance gap 260 between the lower mold cutter 240 and the forming surface 254 of the flanging die 250, which is used to avoid the flanging edge 1.3 of the product 1 when the lower mold cutter 240 is reset after flanging.

[0029] During molding, Figure 3 Product 1, as shown, is positioned on the lower mold base 210, as... Figure 4 and Figure 6 As shown; The upper mold 100 moves downwards, and the upper ejector plate 160 first contacts product 1, such as... Figure 7 As shown; and as the upper mold 100 continues to descend, the upper release plate 160, under the action of the elastic floating connection structure, presses down on product 1, as shown. Figure 8 As shown; After the upper ejector plate 160 presses down on product 1, as the upper mold 100 continues to descend, because the cutting edge 141 of the cutting blade is located below the upper folding blade 150, the cutting blade 140 first reaches the position that mates with the lower mold blade 240, cutting off the connecting waste 1.2 inside the middle hole 1.1 of product 1. The waste falls down, as... Figure 9 As shown; The upper mold 100 continues to descend, and the lower mold cutter 240 moves down to avoid the part of product 1 to be turned 1.4 (the turning edge 1.3 is the part to be turned 1.4 before turning). The upper folding cutter 150 cooperates with the turning die 250 to achieve the turning of the part to be turned 1.4, such as... Figure 10 As shown; The mold is closed, the flanging process is complete, and a flanged edge 1.3 is formed inside the central hole 1.1 of product 1, as shown below. Figure 11 , Figure 1 as well as Figure 2 As shown.

[0030] The cutting and flanging composite mold described in this application can achieve the removal of the connecting waste 1.2 inside the middle hole 1.1 of product 1 and the flanging forming of the middle hole 1.1 after the waste is removed. This eliminates the need for separate molds for the removal of the connecting waste 1.2 and the flanging forming, which helps reduce mold design and manufacturing costs, improves processing efficiency, reduces cumulative errors, improves the precision of product 1, ensures the quality of product 1, and enhances the market competitiveness of product 1. For flanging processing of sheet metal products 1 with large middle holes 1.1, the material corresponding to the middle hole 1.1 in the previous process does not need to be completely cut off. Instead, the connecting waste 1.2 is retained as support, and then the connecting waste 1.2 is removed in the cutting and flanging composite mold of this application, thereby enabling… To ensure the stability of product 1 and reduce the scrap rate, the lower die cutter 240 and the corresponding lower die base 210 can move up and down. After the connecting scrap 1.2 is cut off, the lower die cutter 240 continues to move down with the upper die 100. The lower die cutter 240 moves down to avoid the hole-to-be-flipped part 1.4 of product 1, which can ensure that the lower die cutter 240 does not interfere with the cooperation of the upper folding cutter 150 and the flipping die 250 to flip the hole, and ensure the smooth forming of the hole after the connecting scrap 1.2 is cut off. The lower die cutter 240 is located inside the flipping die 250, and in the horizontal direction, there is a clearance gap 260 between the lower die cutter 240 and the forming surface 254 of the flipping die 250. Therefore, when the lower die cutter 240 moves up to reset after the hole is formed, it can avoid the flipped edge 1.3 of product 1 and will not push the already formed flipped edge 1.3 upward.

[0031] In some embodiments of this application, the upper ejector plate 160 is arranged around the middle hole 1.1 of the product 1 to uniformly and reliably press the product 1; the elastic floating connection structure includes a spring 170 and a shoulder screw 180. The upper end of the spring 170 is connected to the upper mold base 110, and the lower end is connected to the upper ejector plate 160. The upper mold base 110 has a stepped hole 111 that is wider at the top and narrower at the bottom. The shoulder screw 180 passes through the stepped hole 111, and its head is limited in the stepped hole 111. The threaded end of the lower end passes through the stepped hole 111 and is fastened to the upper ejector plate 160. Thus, the shoulder screw 180 plays a guiding and limiting role for the up and down floating of the upper ejector plate 160, ensuring that the up and down floating of the upper ejector plate 160 is stable and reliable.

[0032] In the mold open state, such as Figure 4 and Figure 5As shown, under its own weight, the upper ejector plate 160 is at its maximum distance from the upper mold base 110, the head of the shoulder screw 180 stops at the step of the stepped hole 111, and the spring 170 is in a state of small compression. When the upper mold 100 moves down and the upper ejector plate 160 contacts and presses against the product 1, as the upper mold 100 continues to move down, since the upper ejector plate 160 has already abutted against the product 1, the position of the upper ejector plate 160 no longer changes, and the spring 170 is gradually compressed and stores energy to ensure that the upper ejector plate 160 presses against the product 1. When the mold is opened, the spring 170 recovers its deformation, and the upper ejector plate 160 resets under the action of the spring 170.

[0033] In some embodiments of this application, the upper ejector plate 160 includes an upper ejector plate fixing seat 161 and an upper ejector plate body 162. The upper ejector plate body 162 is located below the upper ejector plate fixing seat 161 and is screwed and fixedly connected to the upper ejector plate fixing seat 161 as a whole. The spring 170 and the shoulder screw 180 are both connected to the upper ejector plate fixing seat 161, and the upper ejector plate body 162 contacts and presses against the product 1. By constituting the upper ejector plate 160 with the upper ejector plate fixing seat 161 and the upper ejector plate body 162, only the upper ejector plate body 162 can be made of a better material, which helps to reduce mold costs.

[0034] In some embodiments of this application, the lower die cutter 240 includes two reinforcing portions 242 located on both sides of the lower die cutter edge portion 241, and the two reinforcing portions 242 are arranged along the extending direction of the lower die cutter edge portion 241. Figure 12 Taking the shown perspective as an example, the cutting edge 241 of the lower die cutter extends along the length direction of the middle hole 1.1 of the product 1, and the two reinforcing parts 242 are arranged along the length direction of the middle hole 1.1 of the product 1, respectively located on opposite sides of the cutting edge 241 of the lower die cutter.

[0035] For product 1 with a very small width of the 1.3-inch flange edge, the volume of the lower die cutter edge 241 is small. At the same time, a clearance 260 must be left between the lower die cutter 240 and the forming surface 254 of the flange die 250, which further reduces the volume of the lower die cutter edge 241. This makes the lower die cutter edge 241 too weak, affecting the cutting effect on the connecting waste 1.2. By setting the reinforcing part 242, the volume of the lower die cutter 240 can be increased, thereby increasing the overall structural strength of the lower die cutter 240, which is beneficial to improving the structural strength of the lower die cutter edge 241.

[0036] In some embodiments of this application, a plurality of guide components 270 are arranged around the lower die cutter 240 to guide the up and down movement of the lower die cutter 240.

[0037] Specifically, such as Figure 6 As shown, and in combination Figure 12The guide component 270 is a block structure fixed in the lower mold base 210. One or more blocks are respectively set on the front, back, left and right sides of the lower mold cutter 240 (avoiding the cutting edge 241 of the lower mold cutter). The guide component 270 fits and slides with the corresponding vertical side of the lower mold cutter 240 to achieve guidance.

[0038] Furthermore, a limiting structure is formed on the top of the guide component 270 to help limit the maximum stroke of the lower die cutter 240 moving upward.

[0039] Specifically, such as Figure 6 Taking the guide component 270 on the right side of the lower die cutter 240 as an example from the perspective shown, a protrusion 271 is formed on the left side of its top end, and a step portion 243 is formed on the right side surface of the lower die cutter 240. When the lower die cutter 240 moves up until its step portion 243 abuts against the protrusion 271 of the guide component 270, the lower die cutter 240 moves up to the maximum stroke position.

[0040] Similarly, for product 1 with a very small width of the flanging edge 1.3, the volume of the lower die cutter edge 241 is small, and a clearance 260 must be left between the lower die cutter 240 and the forming surface 254 of the flanging die 250. This also results in the lower die cutter edge 241 being too weak, which makes it easy to generate lateral force when the cutting blade 140 and the lower die cutter 240 cooperate to cut the material. This causes the connecting waste 1.2 to be stretched when cut, resulting in unevenness of the bent edge 1.5 (i.e., the bottom surface of the flanging edge 1.3) after flanging, affecting the flanging forming quality. To further solve this problem, in some embodiments of this application, such as Figures 5 to 11 As shown, a limiting block 280 protruding vertically upwards to the top of the lower die cutter 240 is fixed on the reinforcing part 242 of the lower die cutter 240. A limiting groove 151 corresponding to and adapted to the limiting block 280 is formed on the upper folding cutter 150. Before the cutting blade 140 and the lower die cutter 240 cooperate to cut the material, the limiting block 280 begins to insert into the limiting groove 151. After the connecting waste material 1.2 is cut off and before the upper folding cutter 150 cooperates with the turning die 250 to turn the hole, the limiting block 280 reaches the position abutting against the bottom surface of the limiting groove 151 to hold the upper folding cutter 150 in place. As the upper die 100 continues to descend, the upper folding cutter 150 drives the lower die cutter 240 to move downwards through the limiting block 280 to avoid the turning part 1.4 of the product 1.

[0041] With the cooperation of the limiting block 280 and the limiting groove 151, the cutting blade 140 and the lower die blade 240 can counteract the lateral force of the cutting blade 140 and the lower die blade 240 during the cutting process, preventing the continuous material from being stretched during the cutting process. This ensures that the connecting waste material 1.2 can be cut off smoothly and instantly, further ensuring that the bent edge 1.5 of the hole edge 1.3 after hole turning is flat, and improving the hole turning quality.

[0042] In some embodiments of this application, the reinforcing part 242 and the limiting block 280 are provided with mutually cooperating mounting and positioning structures.

[0043] Specifically, the installation positioning structure includes a positioning post formed in the middle of the bottom surface of the limiting block 280 and a positioning groove formed on the top surface of the reinforcing block. When the limiting block 280 is installed, the positioning post and the positioning groove cooperate to achieve positioning, and then it is fastened to the reinforcing block by two screws.

[0044] Regarding the upward movement of the lower die cutter 240 relative to the lower die holder 210, in some embodiments of this application, such as... Figures 6 to 11 As shown, nitrogen springs 290 are connected to the lower part of the two reinforcing parts 242 respectively. The upper folding blade 150 drives the lower die blade 240 to move down through the limiting block 280, and compresses the nitrogen springs 290 synchronously. The nitrogen springs 290 store energy. When the mold is opened, the elastic force of the nitrogen springs 290 drives the lower die blade 240 to move up and reset automatically.

[0045] When the mold is closed and the hole is turned, the upper folding knife 150 presses down the lower mold knife 240 through the limit block 280 and moves it down. When the mold is opened, the nitrogen spring 290 drives the lower mold knife 240 to automatically reset. This means that the up and down movement of the lower mold knife 240 relative to the lower mold base 210 is driven by the mold opening and closing action. There is no need to set up a separate power component, which helps to simplify the mold structure and reduce mold cost and failure points.

[0046] In some embodiments of this application, such as Figure 4 and Figure 5 As shown, an upper backing plate 190 is fixedly mounted on the bottom surface of the upper mold base 110. An upper folding blade 150 is fixedly mounted on the upper backing plate 190 and thus fixedly connected to the upper mold base 110. A positioning hole 152 adapted to the cutting blade 140 is formed on the upper folding blade 150. The cutting blade 140 passes through the positioning hole 152 and is fixed on the upper backing plate 190. By setting the upper backing plate 190, the thickness of the upper mold base 110 can be reduced accordingly, thereby reducing the material cost of the mold.

[0047] Regarding the piercing die 250, in some embodiments of this application, such as Figure 6 As shown, the flanging die 250 includes a fixed base 251 and a flanging die body 252. The flanging die body 252 is fixedly connected to the fixed base 251, and the fixed base 251 is fixedly connected to the lower die base 210. The flanging die body 252 cooperates with the upper folding blade 150 to achieve flanging. By making the flanging die 250 consist of a fixed base 251 and a flanging die body 252, only the flanging die body 252 can be made of a better material, which helps to reduce the cost of the mold.

[0048] Furthermore, a notch 253 is formed at the bottom of the piercing die body 252 to allow the lower die cutter 240 to move up and down. By forming the notch 253 on the piercing die body 252 to allow the lower die cutter 240 to move up and down, it is beneficial to reduce the vertical thickness of the lower die cutter 240, thereby reducing the size and cost of the mold.

[0049] In some embodiments of this application, multiple guide post and guide sleeve structures 300 are provided on the upper mold 100 and the lower mold 200 to guide the opening and closing actions of the upper mold 100 in its upward and downward movements.

[0050] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by the present invention.

Claims

1. A composite mold for cutting and flanging, characterized in that, include: The upper mold includes an upper support plate and an upper mold base. A cutting blade, an upper folding blade, and an upper ejector plate connected to the upper mold base via an elastic floating connection structure are fixedly connected to the upper mold base. The cutting edge of the cutting blade is located below the upper folding blade, and the upper ejector plate is located outside the cutting blade and the upper folding blade. The lower mold includes a lower support plate and a lower mold base. The lower mold base is provided with a lower mold cutter corresponding to the cutting blade. A flanging die corresponding to the upper folding blade is fixedly provided on the lower mold base. The lower mold cutter can move up and down relative to the lower mold base. The lower mold cutter is located inside the flanging die. In the horizontal direction, there is a clearance between the lower mold cutter and the forming surface of the flanging die to avoid the flanging edge of the product when the lower mold cutter is reset after flanging. During molding, the upper mold moves downwards. After the upper ejector plate presses down on the product, the cutting blade and the lower mold blade work together to cut off the connecting waste material inside the hole of the product, and the waste material falls down. The upper mold continues to descend, the lower mold cutter moves down to avoid the part of the product to be turned over, and the upper folding cutter cooperates with the turning die to realize the turning over forming of the part of the product to be turned over; The mold is closed, the flanging process is completed, and the flanged edge is formed inside the product hole.

2. The cutting and flanging composite mold according to claim 1, characterized in that, The lower die cutter includes two reinforcing portions located on both sides of its cutting edge, and the two reinforcing portions are arranged along the extension direction of the cutting edge.

3. The cutting and perforating composite mold according to claim 2, characterized in that, The lower die cutter is provided with guide components around its periphery to guide the up-and-down movement of the lower die cutter.

4. The cutting and perforating composite mold according to claim 3, characterized in that, The top of the guide component has a limiting structure to help limit the maximum upward stroke of the lower die cutter.

5. The cutting and perforating composite mold according to claim 2, characterized in that, A limiting block that protrudes vertically upward to the upper part of the lower die is fixed on the reinforcing part, and a limiting groove that is correspondingly provided and adapted to the limiting block is formed on the upper folding blade; Before the cutting blade engages with the lower die, the limiting block begins to insert into the limiting groove. After the connecting waste is cut off and before the upper folding blade engages with the turning die, the limiting block reaches a position abutting against the bottom surface of the limiting groove to hold the upper folding blade in place. As the upper die continues to descend, the upper folding blade drives the lower die to move downward through the limiting block to avoid the turning part of the product.

6. The cutting and perforating composite mold according to claim 5, characterized in that, The reinforcing part and the limiting block have mutually cooperating mounting and positioning structures.

7. The cutting and perforating composite mold according to claim 5, characterized in that, Nitrogen springs are connected to the lower part of each of the two reinforcing parts. The upper folding blade compresses the nitrogen springs synchronously as the lower die blade moves downward through the limiting block.

8. The cutting and flanging composite mold according to claim 1, characterized in that, An upper pad is fixed on the bottom surface of the upper mold base, and the upper folding blade is fixed on the upper pad. A positioning hole adapted to the cutting blade is formed on the upper folding blade, and the cutting blade passes through the positioning hole and is fixed on the upper pad.

9. The cutting and flanging composite mold according to claim 1, characterized in that, The piercing die includes a fixed base and a piercing die body. The piercing die body is fixedly connected to the fixed base as a whole, and the fixed base is fixedly connected to the lower die base.

10. The cutting and perforating composite mold according to claim 9, characterized in that, The bottom of the piercing die body has a notch to allow the lower die cutter to move up and down.

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