Stamping device capable of being stretched transversely

Abstract

A stamping device capable of stretching transversely comprises a lower die and an upper die. The upper die comprises an upper die base and a male die. The lower die comprises a lower die base, an elastic reset mechanism, a floating block and a female die, the floating block is installed on the lower die base through the elastic reset mechanism, and the female die is arranged on the lower die base and penetrates through the floating block. A lower clamping component and a fixed wedge block are arranged on the lower die holder; an upper clamping component is arranged on the upper die holder; the lower clamping assembly comprises a lower clamping block; the lower clamping block is connected to the floating block in a sliding manner; the lower clamping block is provided with a guide groove and a clamping groove; a first inclined wedge surface is arranged in the guide groove, and the fixed wedge block is provided with a second inclined wedge surface; the position, close to the female die, of the top face of the lower clamping block is a bearing face. The upper clamping assembly comprises a guide mounting base fixedly connected to the upper die base and an upper clamping block slidably connected to the guide mounting base; a clamping surface and an inserting part are arranged at the bottom of the upper clamping block, the clamping surface is matched with the bearing surface, and the inserting part is matched with the inner wall of the clamping groove to clamp the plate. The device relieves springback and improves the plate utilization rate.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of stamping device, and particularly relates to a stamping device capable of transverse stretching. BACKGROUND

[0002] Sheet metal stamping forming is a kind of efficient and large-batch manufacturing process, which is widely used in the automobile, aerospace, household appliance and other industries. However, in the forming process, especially after the unloading and demolding of the sheet metal, due to the release of internal elastic strain energy, the formed parts generally have defects such as springback and warping. These defects cause the geometric shape and size of the parts to deviate from the design requirements of the mold cavity, seriously affecting the forming precision and assembly quality of the products.

[0003] The above-mentioned springback and warping problems are particularly prominent in the processing of certain types of parts. For example, when processing formed parts with small-radian characteristics (such as shallow drawing parts, micro-bending parts), the degree of plastic deformation experienced by the sheet metal is limited, and the proportion of elastic deformation is relatively high, thereby causing more significant springback effect. At the same time, with the wide application of high-strength and ultra-high-strength materials in lightweight manufacturing, due to their higher yield strength and stronger elastic recovery tendency, the springback control after forming becomes extremely difficult, posing extreme challenges to mold design and process parameter adjustment.

[0004] To control springback, the prior art usually adopts methods such as over-bending compensation, adding a shaping process, optimizing the parameters of blank holder force and drawbead, etc. However, these methods have obvious limitations: over-bending compensation is heavily dependent on experience and repeated trial molding, with long development cycle and high cost; adding a shaping process means that additional molds and press stations are needed, increasing equipment investment and production cost; and the adjustment space of process parameters is limited, which is often difficult to completely solve the problem for complex parts or high-strength materials.

[0005] On the other hand, in the traditional drawing process, the size (especially the length) of the sheet metal usually needs to meet the requirements after the final part is unfolded. In some application scenarios, if the length of the raw material sheet metal is insufficient, it is often forced to replace a larger size sheet metal or adopt a more expensive blank customization scheme, resulting in an increase in production cost.

[0006] Therefore, there is an urgent need in the art for a stamping forming technology that can fundamentally and effectively suppress the springback and warping of small-radian parts and high-strength material parts, while also achieving effective utilization of materials, improving material utilization rate and reducing cost under the condition of limited original length of sheet metal. SUMMARY

[0007] The present application aims to overcome the deficiencies in the prior art and provide a stamping device capable of transverse stretching.

[0008] To achieve the above object, the present application discloses a punch device capable of transverse stretching, comprising a lower die and an upper die; the upper die comprises an upper die seat and a male die arranged at the bottom of the upper die seat; the lower die comprises a lower die seat, an elastic reset mechanism, a floating block and a female die, the elastic reset mechanism is arranged on the lower die seat, the floating block is arranged on the elastic reset mechanism, and the female die is arranged on the lower die seat and penetrates through the floating block; the floating block moves downward to the lowest position in the closed die state and moves upward to the initial position through the elastic reset mechanism in the open state; The lower die seat is provided with a lower material clamping assembly and a fixed wedge block outside both ends of the female die; the upper die seat is provided with an upper material clamping assembly outside both ends of the male die. The lower material clamping assembly comprises a lower material clamping block; the lower material clamping block is slidably connected to the floating block along the length direction of the female die; the lower material clamping block is provided with a guide groove and a material clamping groove; the guide groove is provided with a first inclined wedge surface, the fixed wedge block is provided with a second inclined wedge surface, and the first inclined wedge surface and the second inclined wedge surface are matched to enable the lower material clamping block to move away from the female die after being driven; the top surface of the lower material clamping block is a bearing surface near the female die, and the bearing surface and the female die jointly bear the plate material in the open state; the material clamping groove is located on the side away from the bearing surface of the bearing surface. The upper material clamping assembly comprises a guide mounting seat and an upper material clamping block; the guide mounting seat is fixedly connected to the upper die seat, and the upper material clamping block is slidably connected to the guide mounting seat along the length direction; the bottom of the upper material clamping block is provided with a material clamping surface and a plug-in part, the material clamping surface is matched with the bearing surface, and the plug-in part is matched with the inner wall of the material clamping groove to clamp the plate material.

[0009] Preferably, the material clamping groove is provided with a side pressing block and an elastic reset member, the side pressing block is slidably connected in the material clamping groove along the length direction, and the two ends of the elastic member are respectively in abutting engagement with the lower material clamping block and the side pressing block; In the open state, the side pressing block is in clearance fit with the inner side wall of the material clamping groove; in the state of clamping the plate material, the side pressing block is in abutting engagement with the plug-in part.

[0010] Preferably, in the closed die state, the bottom surface of the plug-in part is in clearance fit with the groove bottom surface of the material clamping groove.

[0011] Preferably, the bottom of the upper pressing block is fixedly connected with a nitrogen cylinder, the nitrogen cylinder is fixedly connected with a pre-pressing block, and the bottom surface of the pre-pressing block is the material clamping surface.

[0012] Preferably, the locking mechanism comprises a telescopic lever and a limiting piece, the locking mechanism is fixedly connected to the floating block, one end of the limiting piece is fixedly connected to the telescopic lever, and the other end of the limiting piece is extended out of the floating block and is in limiting cooperation with the lower material clamping block under the action of the telescopic lever.

[0013] Preferably, the bottom of the lower material clamping block is provided with a limiting block, the limiting block is provided with a limiting hole, and the limiting piece is a bolt, and the end of the bolt is clamped in the limiting hole. The reset device is further provided, and the reset device cooperates with the limiting block and is used for driving the lower material clamping block to move to the initial position on one side of the concave die.

[0014] Preferably, the floating block is slidably connected with a movable wedge block, the movable wedge block is provided with an inner recess support portion, and the inner recess support portion comprises a third inclined wedge surface and a support surface which are connected together. In the opening state, the third inclined wedge surface is coplanar with the second inclined wedge surface; and in the closing state, the third inclined wedge surface is in abutting cooperation with the first inclined wedge surface and the support surface is in abutting cooperation with the bottom surface of the lower material clamping block.

[0015] Preferably, the side surface of the fixed wedge block close to the movable wedge block is a guide surface, and the inner side wall of the guide groove and the movable wedge block are in sliding cooperation with the guide surface.

[0016] Compared with the prior art, the beneficial effects of the present application are: When the device is used for processing plate materials, after the plate materials are placed on the concave die and the support surface of the lower material clamping block, the upper die is moved downward, can be moved to the clamping surface of the upper material clamping block and the bearing surface of the lower material clamping block to clamp the plate materials together, the inserting part of the upper material clamping block can bend the end of the plate materials into the clamping groove, and the end of the plate materials is clamped after the inserting part is completely inserted into the clamping groove. Then the upper die continues to move downward, and through the cooperation of the second inclined wedge surface and the first inclined wedge surface, the lower material clamping block and the upper material clamping block can move integrally away from the concave die, and the plate materials are stretched in the lateral direction in the process. When the first inclined wedge surface is completely moved out of the second inclined wedge surface and no longer guides the lateral movement of the lower material clamping block, the upper die continues to move downward until the die is closed for stamping and forming, and the die is opened after forming.

[0017] Before stamping, especially for forming parts with small curvature features (such as shallow-drawn parts and micro-bent parts), this device first laterally stretches the sheet metal to allow it to undergo a plastic deformation stage before stamping. This effectively solves problems such as springback and warping after sheet metal stamping, improving forming quality. For sheet metal with limited original length, if traditional clamping is performed using two planes, the small original length means a small clamping area and poor clamping effect. In this design, a clamping groove is designed on the lower clamping block, and an insertion part is designed on the upper clamping block to mate with the clamping groove. This allows the sheet metal to be bent into the clamping groove and clamped within it. This improves the clamping reliability of the sheet metal and avoids the problem of insufficient sheet metal size preventing effective clamping and affecting forming quality. Moreover, after the sheet metal is effectively clamped by the clamping groove and the insertion part, it provides a structural basis for subsequent lateral stretching. This further ensures the lateral stretching function while utilizing sheet metal with limited length, ultimately solving problems such as springback and warping after sheet metal stamping. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the laterally stretchable stamping device in the open state, as shown in the embodiment. Figure 2 for Figure 1 A three-dimensional structural diagram of the upper and middle clamping assembly; Figure 3 for Figure 1 A three-dimensional structural diagram of the lower clamping assembly; Figure 4 for Figure 1 A magnified view of a portion of point A in the middle; Figure 5 for Figure 1 Top view and cross-sectional view of the device when the upper clamping assembly and the lower clamping assembly complete the clamping of the sheet metal; Figure 6 for Figure 5 A magnified view of a portion of point A in the middle; Figure 7 for Figure 5 A magnified view of a portion of point B in the middle; Figure 8 for Figure 1 Top and sectional views of the upper and lower clamping assemblies when the device completes the transverse stretching of the sheet metal; Lower die 100; lower die seat 110; elastic reset mechanism 120; floating block 130; concave die 140; lower clamping assembly 150; lower clamping block 160; guide groove 161; vertical surface 1611; first inclined wedge surface 1612; clamping groove 162; bearing surface 163; limiting block 164; limiting hole 1641; side pressing block 165; elastic reset member 166; accommodating groove 167; reset device 168; fixed wedge block 170; second inclined wedge surface 171; guide surface 172; locking mechanism 180; telescopic lever 181; limiting member 182; movable wedge block 190; inner concave support part 191; third inclined wedge surface 1911; support surface 1912; driving device 192; Upper die 200; upper die seat 210; convex die 220; upper clamping assembly 230; guide mounting seat 231; upper clamping block 232; plug-in part 2321; nitrogen cylinder 233; pre-pressing block 234; clamping surface 2341; Sheet metal 300. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned objectives, features and advantages of the present application more apparent and comprehensible, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0020] A transversely stretchable stamping device, referring to Figures 1-8 , comprising a lower die 100 and an upper die 200; the upper die 200 comprises an upper die seat 210 and a convex die 220 arranged at the bottom of the upper die seat 210; the lower die 100 comprises a lower die seat 110, an elastic reset mechanism 120, a floating block 130 and a concave die 140. In this embodiment, the elastic reset mechanism 120 comprises a plurality of nitrogen cylinders, which are evenly fixed on the lower die seat 110, and the floating block 130 is arranged on the plurality of nitrogen cylinders, so that the floating block 130 moves downward during the process of being pressed by the upper die seat 210 until reaching the closed die state, and automatically moves upward to the initial position after the upper die is opened. The concave die 140 is fixed on the lower die seat 110 and passes through the floating block 130 to cooperate with the convex die 220.

[0021] In this embodiment, the convex die 220 and the concave die 140 are designed for a micro-bend piece with a small-radian feature to be formed, so as to realize the stamping and bending of the long strip-shaped sheet metal 300 into a micro-bend sheet metal 300 similar to a U-shaped piece.

[0022] The lower die seat 110 is provided with a lower clamping assembly 150 and a fixed wedge block 170 outside both ends of the concave die 140, and the upper die seat 210 is provided with an upper clamping assembly 230 outside both ends of the convex die 220. The clamping assemblies and the fixed wedge blocks 170 arranged at both ends realize the clamping of both ends of the sheet metal 300. The clamping assemblies and the fixed wedge blocks 170 at both ends of this embodiment are the same, and the structure of one end is described.

[0023] The lower clamp assembly 150 comprises a lower clamp block 160. The lower clamp block 160 is a reversed T-shaped block, and is slidingly connected to the floating block 130 along the length direction of the concave die 140. The lower clamp block 160 is provided with a guide groove 161 and a clamp groove 162. The guide groove 161 penetrates the upper and lower surfaces of the lower clamp block 160, and is located at the end of the lower clamp block 160 away from the concave die 140. The guide groove 161 is internally away from the inner side wall of the concave die 140, and the upper part is a vertical surface 1611, and the lower part is a first inclined wedge surface 1612. The fixed wedge block 170 is provided with a second inclined wedge surface 171 at the upper part of the side surface away from the concave die 140, and the top of the second inclined wedge surface 171 extends to the top surface of the fixed wedge block 170, and the lower part is a vertically arranged guide surface 172, and the top of the guide surface 172 is connected with the second inclined wedge surface. In the open state, the first inclined wedge surface 1612 and the second inclined wedge surface 171 are arranged oppositely and there is a gap (10mm) between them. The top surface of the lower clamp block 160 is a bearing surface 163 near the concave die 140, and in the open state, the bearing surface 163 and the concave die 140 jointly bear the plate 300. The clamp groove 162 is located at the side of the bearing surface 163 away from the concave die, and the two are arranged adjacently. The length of the bearing surface 163 along the length direction is configured to be a smaller size, so that the end of the plate 300 with a smaller size can also extend through the bearing surface 163 to the clamp groove 162. The upper clamp assembly 230 comprises a guide mounting seat 231 and an upper clamp block 232. The guide mounting seat 231 is fixedly connected to the upper die seat 210, and the upper clamp block 232 is slidingly connected to the guide mounting seat 231 along the length direction, which is the same direction as the lower clamp block 160, so that the two can move in the same direction. The bottom of the upper clamp block 232 has a clamp surface 2341 and a plug-in part 2321, the clamp surface 2341 cooperates with the bearing surface 163, and the plug-in part 2321 cooperates with the inner wall of the clamp groove 162 to clamp the plate 300.

[0024] When the plate 300 is placed on the support surface of the lower clamp block 160 and the concave die 140, the upper die 200 moves downward and can clamp the plate 300 together with the clamping surface 2341 of the upper clamp block 232 and the bearing surface 163 of the lower clamp block 160. The insertion part 2321 of the upper clamp block 232 can bend the end of the plate 300 into the clamping groove 162, and the end of the plate 300 is clamped after the insertion part 2321 is fully inserted into the clamping groove 162. After the plate 300 is clamped, the upper die 200 continues to move downward to make the first inclined wedge surface 1612 contact the second inclined wedge surface 171. When the upper die 200 continues to move downward, the first inclined wedge surface 1612 moves relative to the second inclined wedge surface 171 to move the lower clamp block 160 away from the concave die 140, and the plate 300 is stretched transversely in this process. When the first inclined wedge surface is completely removed from the second inclined wedge surface, the vertical surface 1611 of the guide groove 161 contacts the guide surface 172 of the fixed wedge block 170, the vertical surface 1611 moves downward relative to the guide surface 172, and the whole vertically downward moves for stamping forming. After forming, the upper die is opened.

[0025] Before stamping, the device first stretches the plate 300 transversely to make it experience a plastic deformation stage, and then stamps, effectively solving the problems of springback, warping, etc. after the plate 300 is stamped and formed, and improving the forming quality. For the plate 300 with a limited original length, if it is clamped and clamped by two planes according to the traditional method, the small original length means small clamping area and poor clamping effect. In this embodiment, the clamping groove 162 is designed on the lower clamp block 160, and the insertion part 2321 cooperating with the clamping groove 162 is designed on the upper clamp block 232, so that the plate 300 can be bent into the clamping groove 162 and clamped in the clamping groove 162, which can improve the clamping reliability of the plate 300, avoid the problem that the plate 300 cannot be effectively clamped due to insufficient size, and affect the forming quality. Moreover, after the plate 300 is effectively clamped by the cooperation of the clamping groove 162 and the insertion part 2321, it can provide a structural basis for subsequent transverse stretching, further ensure the realization of the transverse stretching function on the basis of the limited length of the plate 300, and finally solve the problems of springback, warping, etc. after the plate 300 is stamped and formed.

[0026] In order to adapt the device to plates 300 with larger length ranges, in the closed die state, the bottom surface of the insertion part 2321 is gap-fitted with the groove bottom surface of the clamping groove 162, and the gap is adapted to the thickness of the plate 300. In this way, after the plate 300 is bent by the insertion part 2321, the plate 300 can be bent along the side wall where the clamping groove 162 meets the bearing surface 163 and the bottom of the clamping groove 162 to adapt to plates 300 with larger size ranges.

[0027] In the embodiment, the bottom of the upper pressing block is fixedly connected with a nitrogen cylinder 233 on the side close to the concave die 140, the nitrogen cylinder 233 is fixedly connected with a pre-pressing block 234, and the bottom surface of the pre-pressing block 234 is the above-mentioned clamping surface 2341. In the normal state, the clamping surface 2341 of the pre-pressing block 234 is lower than the bottom surface of the insertion part 2321 of the upper clamping block 232, so that in the process of closing the mold, the clamping surface 2341 of the pre-pressing block 234 first presses the plate 300, and then the insertion part 2321 of the upper clamping block 232 further presses the plate 300 to bend into the clamping groove 162, preventing the plate 300 from slipping during the process of bending the end of the plate 300 into the clamping groove 162, ensuring that the plate 300 is always in the preset position, and improving the subsequent clamping effect and processing precision.

[0028] In the embodiment, the clamping groove 162 is provided with a side pressing block 165 and an elastic reset member 166. The side pressing block 165 is slidingly connected in the length direction in the clamping groove 162 and located on the side away from the concave die 140 in the clamping groove 162. The two ends of the elastic member are respectively in abutting cooperation with the lower clamping block 160 and the side pressing block 165. In the open state, the side pressing block 165 is gap-fitted with the inner side wall of the clamping groove 162, such as a gap of about 1.1 mm. When the insertion part 2321 bends the plate 300 until it is completely inserted into the clamping groove 162, the insertion part 2321 pushes the side pressing block 165 to move, and the gap between the side pressing block 165 and the inner side wall of the clamping groove 162 gradually becomes smaller. In this process, under the action of the elastic reset member 166, the side pressing block 165 also abuts against the insertion part 2321.

[0029] By arranging the side pressing block 165 and the elastic reset member 166, on the one hand, the elastic reset member 166 can provide a continuous pressing force for the side pressing block 165. When clamping plate 300 of different thicknesses, the elastic reset member 166 is pressed by the insertion part 2321 to adaptively deform, and can provide corresponding pressing force according to plate 300 of different thicknesses, which can avoid crushing of thin material due to excessive pressure, and prevent slipping of thick material due to insufficient pressure, thereby improving the clamping reliability. On the other hand, under the action of the inner side wall of the clamping groove 162 and the side pressing block 165, the insertion part 2321 of the upper clamping block 232 is stably clamped during the movement of the lower clamping block 160, and moves with the lower clamping block 160, which can improve the movement stability of the upper clamping block 232 and greatly alleviate the problems of movement jamming and sticking.

[0030] Among them, the two surfaces of the side pressing block 165 and the insertion part 2321 of the upper pressing block that are in contact with each other are inclined surfaces, and the inclined surfaces are inclined downward toward the side close to the concave die 140.

[0031] The elastic reset member 166 is a plurality of butterfly springs for the curtain. The side pressing block 165 and the lower clamping block 160 are provided with accommodating grooves 167. The accommodating grooves 167 of the side pressing block 165 and the lower clamping block 160 are oppositely arranged and communicated. The butterfly springs are arranged in the space formed by the two accommodating grooves 167. The bolt passes through the side pressing block 165, is connected with the butterfly springs in series, and is then screwed to the lower clamping block 160.

[0032] In the embodiment, the device further comprises a locking mechanism 180. The locking mechanism 180 comprises a telescopic lever 181 and a limiting member 182. The locking mechanism 180 is fixedly connected to the floating block 130. One end of the limiting member 182 is fixedly connected to the telescopic lever 181. After the transverse stretching is completed, the other end of the limiting member 182 is extended out of the floating block 130 and is in limiting cooperation with the lower clamping block 160, so that the lower clamping block is limited after being transversely moved.

[0033] Specifically, the bottom of the lower clamping block 160 is fixedly connected with a limiting block 164. The limiting block 164 is provided with a limiting hole 1641. The limiting member 182 is a bolt. During the transverse stretching, the bolt does not extend out of the floating block 130, so as to avoid affecting the movement of the lower clamping block 160. After the transverse stretching is completed, the end of the bolt is clamped in the limiting hole 1641 under the action of the telescopic lever 181.

[0034] In the embodiment, the device further comprises a reset device 168. The reset device 168 is preferably a nitrogen cylinder fixed on the floating block 130. The nitrogen cylinder cooperates with the limiting block 164. During the transverse stretching, the nitrogen cylinder is compressed. When the upper die is opened and the floating block 130 moves upward to cooperate with the first inclined wedge surface 1612 and the second inclined wedge surface 171, the lower clamping block 160 moves to the initial position on one side of the concave die 140 under the action of the nitrogen cylinder.

[0035] In the embodiment, the floating block 130 is slidably connected with a movable wedge block 190. The movable wedge block 190 is provided with an inner recess support portion 191. The inner recess support portion 191 comprises a third inclined wedge surface 1911 and a support surface 1912 which are connected together.

[0036] In the open state, the third inclined surface 1911 is coplanar with the second inclined surface 171, which is inclined downward away from the die. In the moving direction of the first inclined surface 1612 relative to the second inclined surface 171, the size of the first inclined surface 1612 is equal to that of the third inclined surface 1911. In the lateral stretching process, the first inclined surface 1612 moves onto the third inclined surface 1911 relative to the second inclined surface 171; after the lateral stretching is completed, the first inclined surface 1612 is completely moved onto the third inclined surface 1911, at which time the supporting surface 1912 is in abutting engagement with the bottom surface of the lower clamp block 160. Then the movable wedge block 190 moves downward with the lower clamp block 160 until the forming is completed. After the forming, the movable wedge block 190 is moved upward to the initial position (the third inclined surface is coplanar with the first inclined surface) under the action of the driving device 192 such as a cylinder. By arranging the movable wedge block 190, the bearing area of the first inclined surface can be ensured in the lateral stretching process, and the problem that the contact area between the first inclined surface and the second inclined surface gradually decreases and the fixed wedge block 170 is damaged due to the large stress is avoided.

[0037] The vertical side surface of the movable wedge block 190 and the vertical surface 1611 of the guide groove 161 are in sliding engagement with the guide surface 172, and move up and down along the guide surface 172.

[0038] The above only describes the preferred embodiments of the present application, and the structure is not limited to the shapes listed above. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A stamping device capable of lateral stretching, characterized in that: The system includes a lower mold and an upper mold; the upper mold includes an upper mold base and a punch disposed at the bottom of the upper mold base; the lower mold includes a lower mold base, an elastic reset mechanism, a floating block, and a die, the elastic reset mechanism being disposed on the lower mold base, the floating block being disposed on the elastic reset mechanism, and the die being disposed on the lower mold base and passing through the floating block; the floating block moves downward to the lowest position in the closed state and moves upward to the initial position through the elastic reset mechanism in the open state; The lower die base is provided with a lower clamping assembly and a fixing wedge on the outer sides of both ends of the die cavity; the upper die base is provided with an upper clamping assembly on the outer sides of both ends of the punch. The lower clamping assembly includes a lower clamping block; the lower clamping block is slidably connected to the floating block along the length direction of the die cavity; the lower clamping block is provided with a guide groove and a clamping groove; the guide groove has a first inclined wedge surface, and the fixed wedge has a second inclined wedge surface, the first inclined wedge surface and the second inclined wedge surface cooperate to allow the lower clamping block to move away from the die cavity after being driven; the top surface of the lower clamping block is a bearing surface near the die cavity, and in the open state, the bearing surface and the die cavity jointly bear the sheet metal; the clamping groove is located on the side of the bearing surface away from the bearing surface; The upper clamping assembly includes a guide mounting seat and an upper clamping block; the guide mounting seat is fixedly connected to the upper mold base, and the upper clamping block is slidably connected to the guide mounting seat along the length direction; the bottom of the upper clamping block has a clamping surface and an insertion part, the clamping surface cooperates with the bearing surface, and the insertion part cooperates with the inner wall of the clamping groove to clamp the sheet material.

2. The stamping device capable of lateral stretching according to claim 1, characterized in that: The clamping groove is provided with a side pressure block and an elastic reset member. The side pressure block is slidably connected to the clamping groove along the length direction. The two ends of the elastic member respectively abut against the lower clamping block and the side pressure block. In the open state, the side pressure block is in clearance fit with the inner wall of the clamping groove; in the clamping state, the side pressure block is in abutment fit with the insertion part.

3. The stamping device capable of lateral stretching according to claim 2, characterized in that: In the mold-closed state, the bottom surface of the insertion part is in clearance fit with the bottom surface of the clamping groove.

4. The stamping device capable of lateral stretching according to claim 1, characterized in that: A nitrogen cylinder is fixedly connected to the bottom of the upper pressure block, and a pre-pressure block is fixedly connected to the nitrogen cylinder. The bottom surface of the pre-pressure block is the clamping surface.

5. The stamping device capable of lateral stretching according to claim 1, characterized in that: It also includes a locking mechanism; the locking mechanism includes a telescopic bar and a limiting member. The locking mechanism is fixedly connected to the floating block, one end of the limiting member is fixedly connected to the telescopic bar, and the other end of the limiting member extends out of the floating block under the action of the telescopic bar to limit and cooperate with the lower clamping block.

6. The stamping device capable of transverse stretching according to claim 5, characterized in that: The bottom of the lower clamping block is provided with a limiting block, the limiting block is provided with a limiting hole, the limiting component is a pin, and the end of the pin is engaged in the limiting hole; It also includes a reset device, which cooperates with the limiting block to drive the lower clamping block to move to the initial position towards the die side.

7. The stamping device capable of transverse stretching according to claim 1, characterized in that: The floating block is slidably connected to a movable wedge block, and the movable wedge block is provided with a concave support part, which includes a third inclined wedge surface and a support surface that are connected together. In the open state, the third wedge surface is coplanar with the second wedge surface; in the closed state, the third wedge surface and the first wedge surface, and the support surface and the bottom surface of the lower clamping block are in abutting engagement.

8. The stamping device capable of transverse stretching according to claim 7, characterized in that: The side of the fixed wedge near the movable wedge is a guide surface, and the inner wall of the guide groove and the movable wedge slide against the guide surface.

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