Anti-cracking forming machining die for heat shield of automobile exhaust system

Abstract

The invention discloses an automobile exhaust system heat shield anti-cracking forming machining die which comprises an upper die structure and a lower die structure, and the upper die structure is provided with a structure for stamping a metal plate and is installed at the output end of hydraulic equipment through bolts; the lower die structure is in a groove shape formed by stamping a metal plate, is mounted on a specified mounting seat through a bolt, and is arranged under the upper die structure; during working, hydraulic equipment pushes the upper die structure to be close to the lower die structure for stamping, the material supplementing box provides a release agent, lubricating demolding is achieved through the limiting column and the pipeline, a spraying part spraying material forms a heat insulation layer, and parts such as an induction heat part of the lower die structure conduct heat transfer in the stamping process to improve the plasticity of a metal plate. According to the die, the stamping cracking risk is effectively reduced, friction force and stress concentration between the metal plate and the die are reduced, meanwhile, the production period is shortened, the production quality and efficiency of the heat shield are improved, and the die has practical value and market prospects.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts production, in particular to a crack-proof forming and processing die for a heat insulation cover of an automobile exhaust system. Background Art

[0002] The heat shield of automobile exhaust system is an important automobile component, which has the following functions: First, it has a protective function, which can prevent the heat generated by the exhaust system from damaging surrounding components such as fuel tanks, brake lines, wires and plastic parts, etc. It can also protect the safety of passengers in the car, reduce the heat transfer into the car, and reduce the temperature and fire risk in the car; second, it improves the performance of the car, optimizes the engine performance, keeps the temperature of the engine compartment stable, improves the combustion efficiency, power output and fuel economy, and reduces noise; it usually uses high temperature resistant materials such as stainless steel, aluminum alloy, ceramic fiber, etc., and is installed in the key parts of the exhaust system. The installation position needs to consider the insulation effect, convenience and the impact on other components, and ensure that there is an appropriate gap with the exhaust system and it is firmly installed. In short, the heat shield of automobile exhaust system is crucial to protecting automobile components, improving automobile performance and riding comfort.

[0003] In the process of forming the heat shield, the mold usually adopts stamping, die casting or injection molding. Among them, conventional manufacturers will choose stamping technology to process the heat shield of the automobile exhaust system. The stamping die is a tool used to stamp the metal sheet into the shape of the heat shield. The stamping die usually consists of an upper die and a lower die. Through the action of the press, the sheet is plastically deformed in the die to form the desired shape. It has the advantages of high production efficiency, low cost, high dimensional accuracy, etc., and is suitable for large-scale production.

[0004] There are some significant technical challenges in the current manufacturing process of heat shields for automotive exhaust systems. First, the material faces stress concentration problems during the forming and stamping stages, especially when passing through corners, sharp corners or small radius areas. This stress concentration phenomenon is particularly obvious and can easily lead to material cracking. In addition, the friction between the metal sheet and the mold surface will also cause the material to be subjected to greater tensile stress during the stamping process, further increasing the risk of cracking.

[0005] In addition to the above problems, the existing heat shields need additional heat insulation treatment after stamping. Specifically, a layer of heat insulation material (such as ceramic fiber, glass fiber, asbestos, etc.) needs to be added between the two layers of formed sheets. This step not only increases the complexity of the manufacturing process, but also prolongs the production cycle.

[0006] Therefore, a mold for forming and processing an anti-cracking heat shield of an automobile exhaust system is proposed. Summary of the invention

[0007] The purpose of the present invention is to provide a crack-proof forming die for a heat shield of an automobile exhaust system, so as to solve the problems of stamping cracking and long production cycle of the forming die for the heat shield of an automobile exhaust system proposed in the above background technology.

[0008] To achieve the above object, the present invention provides the following technical solution: a mold for forming and processing an anti-cracking heat shield of an automobile exhaust system, comprising: The upper die structure has a structure for punching the metal plate and is installed at the output end of the hydraulic device by bolts; The lower die structure has a groove formed by stamping a metal plate, which is mounted on a designated mounting seat by bolts and is arranged directly below the upper die structure; Wherein, the upper die structure comprises a stamping plate, a feeding box is fixedly arranged on the upper surface of the stamping plate, at least four limiting columns are arranged on the peripheral side of the feeding box between the buffer springs, and the limiting columns are all fixed on the upper surface of the stamping plate, a transfer liquid chamber is opened inside the limiting columns, and a positioning piston rod is provided inside the transfer liquid chamber through a spring sliding limit, the lower end of the positioning piston rod slides and extends out of the transfer liquid chamber to the outside of the stamping plate, and a rolling ball is rolled on the passing end of the positioning piston rod, wherein a part of the limiting columns is connected with the inside of the feeding box, and a spraying part for spraying material onto the surface of the metal plate is arranged on the side of another part of the limiting columns; The lower mold structure includes a lower mold, a stamping die groove is opened on the surface of the lower mold, and hydraulic chambers are symmetrically opened on both sides of the stamping die groove inside the lower mold, and a plurality of injection pipelines and liquid inlet pipelines are respectively opened on both sides of the upper part of the hydraulic chamber, close to and away from the stamping die groove, wherein the liquid inlet pipeline is arranged corresponding to the limiting column and is connected through a retractable pipeline, the injection pipelines are evenly distributed on both sides of the stamping die groove, and one end of the injection pipeline extends through the inside of the stamping die groove, and the inside of the injection pipeline is equipped with a one-way valve, and a piston lifting plate is sealingly and slidingly arranged in the middle and upper position of the hydraulic chamber, and the upper surface of the piston lifting plate A hydraulic spring and a telescopic rod are movably fixedly arranged at the center position, a plurality of induction heat parts are fixedly arranged on the lower surface of the piston lifting plate, a heat-conducting seat is fixedly arranged at the bottom of the hydraulic chamber just below the induction heat parts, an induction coil is sleeved between the induction heat parts and the heat-conducting seat, the heat-conducting seat is fixed to an isolation heat-conducting frame on one side close to the stamping die groove, a heat-conducting support is integrally arranged on the surface of the isolation heat-conducting frame facing the stamping die groove, and the extending ends of the support respectively extend to the inside of the heat-conducting cavity and the flat groove opened along the path at the notch position of the stamping die groove, and are in contact with the heat-conducting material arranged in the heat-conducting cavity and the contact heat sheet fixed in the flat groove for heat conduction.

[0009] Preferably, the upper mold structure also includes an assembly template, and the center positions of the upper and lower surfaces of the assembly template are integrally provided with flanges for connection, and are respectively connected and fixed to the hydraulic equipment and the stamping part through the flanges, wherein a preset stamping model is integrally provided on the lower surface of the stamping part, and the assembly template is equidistantly provided with two rows of through smooth lifting holes on both sides of the flange, and a buffer spring is correspondingly provided at the lower port of each lifting hole, and the buffer spring consists of a spring and a limiting slide rod, wherein the spring is movably arranged between the assembly template and the stamping plate, the limiting slide rod is inserted into the center position of the spring, and the lower end is fixed to the stamping plate, and the upper end is slidably inserted into the lifting hole of the assembly template, and is limited by a nut at the upper end of the limiting slide rod passing through the lifting hole, the plate shape of the stamping plate is the same as the plate shape design of the assembly template, and the center positions of the stamping plate and the feeding box are provided with through holes for lifting and sliding limitation of the stamping part.

[0010] Preferably, a mounting part is fixedly provided at the center position of the bottom of the lower mold.

[0011] Preferably, the telescopic rod is located at the center of the hydraulic spring, and the upper ends of the hydraulic spring and the telescopic rod are both fixed above the interior of the hydraulic chamber.

[0012] Preferably, a heat-conducting core is disposed inside the heat-conducting seat, and the core and the induction heating element are arranged in a plug-in structure.

[0013] Preferably, initially, the induction heating element and the heat-conducting seat are not within the annular sleeve of the induction coil, and the electrical terminals of the induction coil extend out of the lower mold after insulation isolation and are connected to external electrical control equipment.

[0014] Preferably, the isolated heat-conducting frame is composed of an isolation sleeve and a heat-conducting core material fixed inside the isolation sleeve, wherein the isolation sleeve is fixed inside the lower mold, and one end of the heat-conducting core material is connected to the core body inside the heat-conducting seat.

[0015] Preferably, the heat conduction cavity is arranged at intervals just below the stamping die groove inside the lower mold, and the heat conduction cavity is arranged to surround half of the tube diameter of the stamping die groove.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention, through the arrangement of the assembly template, buffer spring, stamping part, stamping plate, feeding box, limiting column, transfer liquid chamber, positioning piston rod, lower mold, assembly part, hydraulic chamber, liquid inlet pipeline, liquid injection pipeline, stamping die groove, piston lifting plate, hydraulic spring, telescopic rod, induction heat part, heat conductive seat, isolation heat conductive frame, contact heat plate and induction coil, can use the stamping pressure to press the release agent inside the limiting column into the interior of the hydraulic chamber during the stamping process, so that the piston lifting plate inside the hydraulic chamber moves along the inner wall of the hydraulic chamber, and cooperates with the induction coil in the downward movement process to achieve heating of the induction heat part, and conduction of the internal heat of the induction heat part to the heat conductive seat, isolation heat conductive frame and contact heat plate, so as to heat the metal plate and the stamping die groove. At the same time, the release agent can enter the interior of the stamping die groove during stamping, and form a lubricating film on the contact interface between the metal plate and the stamping die groove. According to the above design, not only can the metal plate be heated during the stamping process, Heating the metal plate significantly improves its plasticity and reduces the internal stress generated during stamping due to excessive material rigidity. Especially in the forming process of some complex shapes, such as the bending parts and edge areas of the heat shield, local heating enables the metal plate to better adapt to the changes in the shape of the mold, further reducing the possibility of stress concentration and cracking, and improving the quality stability of the product. In addition, the use of the release agent greatly reduces the friction between the metal plate and the mold. During the stamping process, the reduction in friction significantly reduces the tensile stress borne by the metal plate. When the metal plate is plastically deformed in the mold, especially at corners, sharp corners or small radius areas where stress concentration is likely to occur, the additional tensile stress caused by friction is reduced, thereby effectively avoiding cracking caused by excessive stress. In addition, the lubricating effect of the release agent makes the deformation of the metal plate in the mold smoother, improving the forming quality and the qualified rate of the product. The present invention can spray specific materials onto the surface of the metal plate during the stamping process by arranging the stamping plate, the limiting column, the transfer liquid chamber, the positioning piston rod, the spraying part, the lower mold, the assembly part, the hydraulic chamber, the liquid inlet pipeline, the liquid injection pipeline, the stamping die groove, the heat conduction cavity, the piston lifting plate, the hydraulic spring, the telescopic rod, the induction heat part, the heat conduction seat, the isolation heat conduction frame and the induction coil. These materials will form a heat insulation layer on the surface of the metal plate during the subsequent heating process, thereby eliminating the process of additional heat insulation treatment after stamping in the traditional process. This innovative design greatly shortens the production cycle and improves production efficiency. In actual production, there is no need to transfer the stamped parts to other equipment or processes for heat insulation treatment, thereby reducing the time waste and operation complexity of the intermediate links. At the same time, the simultaneous spraying and stamping can also better ensure the bonding strength and uniformity between the heat insulation layer and the metal plate, thereby improving the overall performance and quality of the product. The present invention prevents the metal plate from being damaged by the excessive instantaneous impact force of the upper die by setting the positioning piston rod. At the same time, the rolling ball design of the positioning piston rod and its accurate positioning function ensure the accuracy of the stamping position. During the stamping process, the metal plate can be evenly stressed, reducing the risk of stress concentration and cracking caused by uneven local stress. Accurate positioning also improves the accuracy and consistency of product size and reduces the scrap rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A three-dimensional structural view of the present invention; Figure 2 It is a structural breakdown diagram of the present invention; Figure 3 It is a structural cross-sectional view of the present invention; Figure 4 It is a cross-sectional view and a partial enlarged view of the stamping plate and its connection structure of the present invention; Figure 5 This is a disassembled diagram of the lower mold structure of the present invention; Figure 6 It is a multiple cross-sectional view of the lower mold of the present invention; Figure 7 Schematic diagram of the internal structure of the lower mold of the present invention Figure 1 ; Figure 8 Schematic diagram of the internal structure of the lower mold of the present invention Figure 2 .

[0018] In the figure: 1. Upper die structure; 11. Assembly template; 111. Buffer spring; 112. Stamping parts; 12. Stamping plate; 121. Feed box; 122. Limiting column; 1221. Transfer liquid chamber; 1222. Positioning piston rod; 1223. Spraying parts; 2. Lower die structure; 21. Lower die; 211. Assembly parts; 212. Hydraulic chamber; 2121. Liquid inlet pipeline; 2122. Liquid injection pipeline; 213. Stamping die groove; 2131. Thermal conduction cavity; 22. Piston lifting plate; 221. Hydraulic spring; 222. Telescopic rod; 223. Induction heating element; 224. Thermal conductive seat; 225. Isolation thermal conductive frame; 226. Contact thermal sheet; 227. Induction coil. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figures 1 to 8 The present invention provides a technical solution for a mold for anti-cracking forming of a heat shield of an automobile exhaust system: A mold for forming and processing an anti-cracking heat shield of an automobile exhaust system, comprising: The upper die structure 1 has a structure for punching a metal plate and is mounted on the output end of the hydraulic device by bolts; The lower die structure 2 has a groove shape formed by stamping a metal plate, is mounted on a designated mounting seat by bolts, and is arranged directly below the upper die structure 1 .

[0021] The upper mold structure 1 includes an assembly template 11, and flanges for connection are integrally provided at the center positions of the upper and lower surfaces of the assembly template 11, and are respectively connected and fixed to the hydraulic equipment and the stamping part 112 through the flanges, wherein a preset stamping model is integrally provided on the lower surface of the stamping part 112, and the assembly template 11 is provided with two rows of through smooth lifting holes equidistantly opened on both sides of the flange, and a buffer spring 111 is correspondingly provided at the lower end of each lifting hole, and the buffer spring 111 is composed of a spring and a limiting slide rod, wherein the spring is movably arranged between the assembly template 11 and the stamping plate 12, and the limiting slide rod is inserted in the center position of the spring, and the lower end is fixed to the stamping plate 12, and the upper end is slidably inserted in the lifting hole of the assembly template 11, and is limited by a nut at the upper end of the limiting slide rod passing through the lifting hole, the plate type of the stamping plate 12 is the same as the plate type design of the assembly template 11, and a feeding box 121 is fixedly provided on the upper surface of the stamping plate 12, and The center positions of the stamping plate 12 and the feeding box 121 are both provided with through holes for limiting the lifting and sliding of the stamping part 112. The internal storage of the feeding box 121 uses a designated demoulding agent, and the peripheral side of the feeding box 121 is provided with at least four limiting columns 122 between the buffer springs 111, and the limiting columns 122 are all fixed on the upper surface of the stamping plate 12, and the limiting columns 122 are each provided with a transfer liquid chamber 1221, and the interior of the transfer liquid chamber 1221 is limited by the sliding of a spring and is provided with a positioning piston rod 1222, the lower end of the positioning piston rod 1222 slides and extends out of the transfer liquid chamber 1221 to the outside of the stamping plate 12, and the passing end of the positioning piston rod 1222 is rollingly provided with a rolling ball for easy movement, wherein the limiting column 122 in the same column as the buffer spring 111 is connected to the interior of the feeding box 121 through a one-way valve, and a one-way output interface is provided on the side, and is fixedly connected to a retractable pipeline through the interface.

[0022] The lower die structure 2 includes a lower die 21, a mounting part 211 is fixedly arranged at the center position of the bottom of the lower die 21, a stamping die groove 213 for docking and stamping with the stamping part 112 is opened on the surface of the lower die 21 facing the upper die structure 1, and a hydraulic chamber 212 is symmetrically opened on both sides of the stamping die groove 213 inside the lower die 21, and a plurality of injection pipelines 2122 and liquid inlet pipelines 2121 are respectively opened on both sides of the upper part of the hydraulic chamber 212 near the stamping die groove 213 and away from the stamping die groove 213, wherein the liquid inlet pipeline 2121 is arranged corresponding to the limiting column 122 and is connected through a retractable pipeline, so as to perform the hydraulic chamber 2 12, the injection pipeline 2122 is evenly distributed on both sides of the stamping die groove 213, and one end of the injection pipeline 2122 extends through the stamping die groove 213, and the inside of the injection pipeline 2122 is equipped with a one-way valve open to the stamping die groove 213, the piston lifting plate 22 is sealed and slidably arranged in the middle and upper position of the hydraulic chamber 212, and the center position of the upper surface of the piston lifting plate 22 is movably fixed with a retractable hydraulic spring 221 and a telescopic rod 222, and the telescopic rod 222 is at the center position of the hydraulic spring 221, and the upper ends of the hydraulic spring 221 and the telescopic rod 222 are fixed in the hydraulic chamber 212. Above, a plurality of heat-insulating threaded mounting seats are symmetrically fixed on the lower surface of the piston lifting plate 22, and are connected to the induction heat member 223 through the threaded mounting seats. The induction heat member 223 is made of metal, and a heat-conducting seat 224 is fixedly arranged at the bottom of the hydraulic chamber 212 directly below it, and a heat-conducting core is arranged inside the heat-conducting seat 224, and the core and the induction heat member 223 are arranged in a plug-in structure, and an induction coil 227 is sleeved between the induction heat member 223 and the heat-conducting seat 224, and at the initial stage, the induction heat member 223 and the heat-conducting seat 224 are not within the annular sleeve of the induction coil 227, and the electrical terminals of the induction coil 227 are extended through the induction coil 227 after insulation isolation. The lower mold 21 is protruded and connected to the external electronic control equipment. The heat-conducting seat 224 is fixed to a special-shaped isolation heat-conducting frame 225 on one side close to the stamping die groove 213. The isolation heat-conducting frame 225 is composed of an isolation sleeve and a heat-conducting core material fixed inside the isolation sleeve, wherein the isolation sleeve is fixedly arranged inside the lower mold 21, and one end of the heat-conducting core material is connected to the core body inside the heat-conducting seat 224. The surface of the isolation heat-conducting frame 225 facing the stamping die groove 213 is integrally provided with a plurality of branches extending upward for heat conduction, and the extended end of the branch extends to the flat groove opened along the path at the notch position of the stamping die groove 213, and contacts with the contact heat plate 226 fixed in the flat groove for heat conduction.

[0023] During operation, the metal plate is first placed at the stamping die groove 213 on the upper surface of the lower die 21, and the hydraulic equipment is started to push the upper die structure 1 close to the lower die structure 2. The stamping plate 12 in the upper die structure 1 moves downward along with the assembly template 11, and the ball at the lower end of the positioning piston rod 1222 contacts the metal plate, and slides upward under the reaction force to stretch the spring, while compressing the release agent and spray material in the transfer liquid chamber 1221. The release agent enters the hydraulic chamber 212 to press the piston lifting plate 22 to slide downward, synchronously stretching the hydraulic spring 221 and the telescopic rod 222, and causing the induction heating element 223 to enter the range of the induction coil 227 to be heated. Heat is conducted to the contact heat plate 226 and the heat conduction cavity 2131 to preheat the metal plate and the stamping die groove 213, and the spray material is sprayed onto the surface of the metal plate. When the release agent breaks through the pressure limit of the one-way valve of the injection pipeline 2122, it enters the stamping die groove 213 for lubrication. After the stamping plate 12 descends and adheres to the surface of the lower mold 21, the piston lifting plate 22 is reset, and the heating and heat conduction are stopped. At this time, the positioning piston rod 1222 is completely retracted, and the hydraulic equipment continues to push down the assembly template 11, compressing the buffer spring 111 and pushing the stamping part 112 to stamp the metal plate. The release agent diffuses and the spray material forms a heat-insulating protective layer.

[0024] In summary, by assembling the template 11, the buffer spring 111, the stamping part 112, the stamping plate 12, the feeding box 121, the limiting column 122, the transfer liquid chamber 1221, the positioning piston rod 1222, the lower mold 21, the assembly part 211, the hydraulic chamber 212, the liquid inlet pipeline 2121, the liquid injection pipeline 2122, the stamping die groove 213, the piston lifting plate 22, the hydraulic spring 221, the telescopic rod 222, the induction heat part 223, the heat conductive seat 224, the isolation heat conductive frame 225, the contact heat sheet 226 and the induction coil 227 During the stamping process, the mold release agent in the limiting column 122 can be pressed into the hydraulic chamber 212 by using the stamping pressure, so that the piston lifting plate 22 in the hydraulic chamber 212 moves along the inner wall of the hydraulic chamber 212, and cooperates with the induction coil 227 to heat the induction heating element 223 during the downward movement, and the heat inside the induction heating element 223 is conducted to the heat conducting seat 224, the isolation heat conducting frame 225 and the contact heat sheet 226, so that the metal plate and the stamping die groove 213 can be heated. At the same time, the mold release agent can enter during stamping. The inside of the stamping die groove 213 and a lubricating film are formed at the contact interface between the metal plate and the stamping die groove 213. According to the above design, not only can the metal plate be heated during the stamping process to significantly improve its plasticity, but also the internal stress generated during stamping due to excessive rigidity of the material can be reduced. Especially in the forming process of some complex shapes, such as the bending parts and edge areas of the heat insulation cover, local heating enables the metal plate to better adapt to the changes in the shape of the mold, further reducing the possibility of stress concentration and cracking, and improving the quality stability of the product. Moreover, the use of the release agent greatly reduces the friction between the metal plate and the mold. During the stamping process, the reduction in friction significantly reduces the tensile stress borne by the metal plate. When the metal plate is plastically deformed in the mold, especially at corners, sharp corners or small radius areas where stress concentration is likely to occur, the additional tensile stress caused by friction is reduced, thereby effectively avoiding cracking caused by excessive stress. Moreover, the lubricating effect of the release agent makes the deformation of the metal plate in the mold smoother, thereby improving the forming quality and the qualified rate of the product.

[0025] As an embodiment of the present invention, Figures 1 to 6 As shown, the sides of the limiting columns 122 at the front and rear sides of the feeding box 121 are respectively provided with input and output one-way interfaces, wherein the output one-way interface is fixedly connected to a spraying part 1223 for spraying material onto the surface of the metal plate, and the input one-way interface is connected to the paint supply equipment.

[0026] The surface of the isolated heat-conducting frame 225 facing the stamping die groove 213 is integrally provided with a plurality of branches extending upward for heat conduction, and the extended ends of the branches extend to the interior of the heat-conducting cavity 2131, and contact and conduct heat with the heat-conducting material arranged inside the heat-conducting cavity 2131. The heat-conducting cavity 2131 is arranged directly below the stamping die groove 213 in the lower mold 21, and the heat-conducting cavity 2131 is arranged to surround half of the tube diameter of the stamping die groove 213.

[0027] During operation, the positioning piston rod 1222 slides upward under the reaction force to stretch the spring, while compressing the spray material in the transfer liquid chamber 1221. The spray material will be sprayed onto the surface of the metal plate through the spray part 1223, and form a heat insulating protective layer on the surface of the metal plate under the action of heating.

[0028] In summary, through the arrangement of the stamping plate 12, the limiting column 122, the transfer liquid chamber 1221, the positioning piston rod 1222, the spraying part 1223, the lower mold 21, the assembly part 211, the hydraulic chamber 212, the liquid inlet pipeline 2121, the liquid injection pipeline 2122, the stamping die groove 213, the heat conduction cavity 2131, the piston lifting plate 22, the hydraulic spring 221, the telescopic rod 222, the induction heat part 223, the heat conduction seat 224, the isolation heat conduction frame 225 and the induction coil 227, a specific material can be sprayed on the surface of the metal plate during the stamping process. These materials will form a heat-insulating layer on the surface of the metal plate during the subsequent heating process, eliminating the traditional process of additional heat-insulating treatment after stamping. This innovative design greatly shortens the production cycle and improves production efficiency. In actual production, there is no need to transfer the stamped parts to other equipment or processes for heat-insulating treatment, reducing time waste and operational complexity in the intermediate links. At the same time, the simultaneous spraying and stamping can better ensure the bonding strength and uniformity between the heat-insulating layer and the metal plate, thereby improving the overall performance and quality of the product.

[0029] Working principle: First, install the upper mold structure 1 on the output end of the hydraulic equipment through bolts to ensure that it is firmly installed so that it can accurately receive the power of the hydraulic equipment and perform corresponding actions. The lower mold structure 2 is installed on the specified mounting seat through bolts, and the positions of the upper mold structure 1 and the lower mold structure 2 must be accurately corresponding and in a relative position directly below to prepare for subsequent stamping work. At the same time, check whether the release agent reserves in the replenishment box 121 are sufficient, as well as the connection sealing of the pipelines connected to the replenishment box 121 and the limiting column 122 and other components. Check the hydraulic chamber 212, injection pipeline 2122, liquid inlet pipeline 2121 and other parts in the lower mold structure 2 to ensure that the pipelines are unobstructed and leak-free, and the one-way valve can work normally. Also check the induction line Whether the connection between the ring 227 and the external electronic control equipment is normal, as well as the installation stability of the induction heat part 223, the heat-conducting seat 224 and other components, can be used after the inspection is completed; during use, first cut the metal plate (mostly aluminum plate, honeycomb aluminum plate) to the specified size, and then place the metal plate on the upper surface of the lower mold 21, so that the metal plate is stably placed in the position of the stamping die groove 213, and then start the hydraulic equipment to push the upper mold structure 1 downward to make the upper mold structure 1 close to the lower mold structure 2. At this time, the stamping plate 12 in the upper mold structure 1 moves downward together with the assembly template 11, and the ball at the lower end of the positioning piston rod 1222 will first contact the metal plate. As the upper mold structure 1 continues to move downward, the positioning piston rod 1222 is reacted by the metal plate. The force will slide upward along the transfer liquid chamber 1221 to stretch the spring, which plays a certain buffering and positioning role, ensuring the accuracy of the stamping position, and the rolling design of the ball can reduce the friction with the surface of the metal plate, avoiding damage to the surface of the metal plate before and during stamping. At the same time, during the sliding process, the positioning piston rod 1222 will compress the release agent and spray material in the transfer liquid chamber 1221, so that the release agent and spray material enter the corresponding pipeline, wherein the release agent will enter the interior of the hydraulic chamber 212 along the pipeline, and press the piston lifting plate 22 to slide downward along the inner wall of the hydraulic chamber 212 in the form of hydraulic pressure, and during the sliding process of the piston lifting plate 22, the hydraulic spring 221 and the telescopic rod 222 are stretched synchronously, and the induction heat piece 22 is pushed. 3 gradually enters the range of the induction coil 227. The energized induction coil 227 can adjust the magnetic field strength and heating temperature according to actual needs to generate eddy currents in the induction heating element 223 by alternating the magnetic field, so that the electrons in the induction heating element 223 move irregularly at high speed to generate heat, thereby heating the induction heating element 223. The heated induction heating element 223 will continue to move downward to be plugged and docked with the heat-conducting seat 224, and then the heat of the induction heating element 223 will be conducted to the inside of the heat-conducting seat 224, and the heat-conducting inner core of the heat-conducting seat 224 and the isolation heat-conducting frame 225 will be extended to conduct to the contact heat sheet 226 and the heat-conducting cavity 2131, thereby heating the contact heat sheet 226 and the heat-conducting cavity 2131, wherein the contact heat sheet 226 will conduct the heat to the surface of the metal plate.The heat-conducting material inside the heat-conducting cavity 2131 will absorb and radiate heat to the stamping die groove 213, preheating the stamping die groove 213 in advance, and the spray material will be evenly sprayed onto the surface of the metal plate through the spray part 1223 along the pipeline. When the stamping plate 12 continues to descend and is not attached to the surface of the lower mold 21, as the release agent continues to enter the hydraulic chamber 212, it will break through the opening pressure limit of the one-way valve pressure relief valve inside the injection pipeline 2122, and then the release agent inside the hydraulic chamber 212 will be output to the inside of the stamping die groove 213 through the one-way valve to lubricate the inside of the stamping die groove 213. As the release agent inside the hydraulic chamber 212 leaks out, the hydraulic force of the piston lifting plate 22 will gradually decrease and gradually tend to the initial hydraulic water During this process, the metal plate will always be in a heated state. This local heating can improve the plasticity of the metal plate, further reduce stress concentration during stamping, and prevent cracking. The material sprayed on the surface of the metal plate will be slightly solidified, and the stamping die groove 213 is also in a preheated state. When the stamping plate 12 descends and adheres to the surface of the lower mold 21, the piston lifting plate 22 is reset to the initial position with the assistance of the hydraulic spring 221, and then the induction heating element 223 will move out of the range of action of the induction coil 227, stopping the heating of the induction heating element 223 and the heat conduction of the induction heating element 223 to the heat conduction seat 224, the isolation heat conduction frame 225, the contact heat sheet 226 and the heat conduction cavity 2131. At this time, the positioning piston rod 1222 is completely retracted into the transfer liquid chamber 122 1, and then the hydraulic equipment will continue to push down the assembly template 11, and then the assembly template 11 will compress the buffer spring 111, and while compressing the buffer spring 111, steadily push the stamping part 112 to move toward the metal plate, and start to stamp the metal plate, so that it gradually deforms and enters the stamping die groove 213 of the lower die structure 2. During the stamping process, under the influence of the extrusion force, the demoulding agent will evenly diffuse between the stamping die groove 213 and the stamped heat shield, and the sprayed material will form a dense heat insulation protective layer on the surface of the metal plate under the heating of continuous residual heat; after the stamping is completed (after the heat insulation protective layer and the heat insulation cover are formed stably), the hydraulic equipment drives the upper die structure 1 to rise up, at this time, the stamping plate 12 and the stamping part 112 are assembled The template 11 rises together, and the positioning piston rod 1222 is reset downward by the action of the spring in the transfer liquid chamber 1221. The reset of the positioning piston rod 1222 directly causes the spatial volume of the transfer liquid chamber 1221 below it to change, which is specifically manifested as the increase of the spatial volume after compression reset. This means that if the volume in a closed system increases without new gas or liquid replenished, the air pressure in the system will drop, thereby forming a negative pressure environment below atmospheric pressure. The generation of the negative pressure environment further triggers the opening mechanism of the one-way valve between the limiting column 122 and the feeding box 121, causing it to open to the limiting column 122, and then the release agent will enter the interior of the limiting column 122, thereby realizing the replenishment of the release agent inside the limiting column 122.After the upper mold structure 1 and the lower mold structure 2 are completely separated, the heat shield can be demoulded. After the heat shield is demoulded, the inside of the stamping die groove 213 needs to be cleaned to ensure the cleanliness of the inside of the stamping die groove 213, and then the stamping operation of the next metal plate can be carried out.

[0030] It should be noted that the release agent is a high-temperature resistant release agent, such as silicone oil release agent, fluorine release agent, silicone release agent, etc., and the best product can be selected according to actual conditions; the side of the feed box 121 is provided with an interface for replenishing the release agent; the thermal conductive material inside the heat conduction cavity 2131 can be selected from any suitable type such as solid, liquid, etc.; the spraying material inside the limiting column 122 can be a liquid or solution material that can easily form a thermal insulation layer on the surface of the metal plate or aluminum plate after heating, such as a ceramic precursor solution, a silicone resin solution, etc., and the specific material can be selected according to actual conditions.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mold for forming and processing an anti-cracking heat shield of an automobile exhaust system, comprising: The upper die structure (1) has a structure for punching a metal plate and is mounted on the output end of the hydraulic device by bolts; The lower die structure (2) has a groove formed by stamping a metal plate, is mounted on a designated mounting seat by means of bolts, and is arranged directly below the upper die structure (1). Features: The upper mold structure (1) comprises a stamping plate (12), a feeding box (121) is fixedly arranged on the upper surface of the stamping plate (12), at least four limiting columns (122) are arranged on the peripheral side surface of the feeding box (121) between the buffer springs (111), and the limiting columns (122) are all fixed on the upper surface of the stamping plate (12), and a transfer liquid chamber (1221) is opened inside the limiting columns (122), and the interior of the transfer liquid chamber (1221) The part is provided with a positioning piston rod (1222) by means of a spring sliding limit, the lower end of the positioning piston rod (1222) slides and extends through the transfer liquid chamber (1221) to the outside of the stamping plate (12), and a rolling ball is provided on the extended end of the positioning piston rod (1222), wherein a part of the limiting column (122) is connected to the inside of the feed box (121), and a spraying part (1223) for spraying material onto the surface of the metal plate is provided on the side of the other part of the limiting column (122); The lower die structure (2) comprises a lower die (21), a stamping die groove (213) is provided on the surface of the lower die (21), and hydraulic chambers (212) are symmetrically provided inside the lower die (21) on both sides of the stamping die groove (213), and the lower die (21) is provided with a plurality of injection pipelines (2122) and liquid inlet pipelines (2121) on both sides of the upper part of the hydraulic chamber (212) and close to and away from the stamping die groove (213), respectively, wherein the liquid inlet pipelines (2122) and liquid inlet pipelines (2121) are provided on both sides of the upper part of the hydraulic chamber (212) and close to the stamping die groove (213). 2121) is arranged corresponding to the limiting column (122) and is connected through a retractable pipeline. The injection pipeline (2122) is evenly distributed on both sides of the stamping die groove (213), and one end of the injection pipeline (2122) extends through the inside of the stamping die groove (213). A one-way valve is installed inside the injection pipeline (2122). A piston lifting plate (22) is sealed and slidably arranged at the middle and upper position inside the hydraulic chamber (212). The piston lifting plate (22) 2) A hydraulic spring (221) and a telescopic rod (222) are movably fixedly arranged at the center of the upper surface, a plurality of induction heat components (223) are fixedly arranged on the lower surface of the piston lifting plate (22), a heat conducting seat (224) is fixedly arranged at the bottom of the hydraulic chamber (212) directly below the induction heat components (223), an induction coil (227) is sleeved between the induction heat components (223) and the heat conducting seat (224), and the heat conducting seat (224) is close to the piston lifting plate (222). One side of the stamping die groove (213) is fixed to an isolated heat-conducting frame (225), and a heat-conducting support is integrally provided on the surface of the isolated heat-conducting frame (225) facing the stamping die groove (213), and the extension ends of the support respectively extend into the interior of the heat-conducting cavity (2131) and into a flat groove opened along the path at the notch position of the stamping die groove (213), and are in contact with the heat-conducting material provided in the heat-conducting cavity (2131) and the contact heat sheet (226) fixed in the flat groove for heat conduction.

2. The anti-cracking forming mold for the heat shield of an automobile exhaust system according to claim 1, characterized in that: The upper die structure (1) further comprises an assembly template (11), wherein flanges for connection are integrally provided at the center positions of the upper and lower surfaces of the assembly template (11), and are respectively connected and fixed to the hydraulic equipment and the stamping part (112) via the flanges, wherein a preset stamping model is integrally provided on the lower surface of the stamping part (112), and the assembly template (111) is provided with two rows of through smooth lifting holes equidistantly formed on both sides of the flange, and a buffer spring (111) is correspondingly provided at the lower end of each lifting hole, and the buffer spring (111) is composed of a spring and a limiting sliding member. The spring is movably arranged between the assembly template (11) and the stamping plate (12), the limiting slide rod is inserted in the center position of the spring, and the lower end is fixed to the stamping plate (12), and the upper end is slidably inserted in the lifting hole of the assembly template (11), and the upper end of the limiting slide rod passing through the lifting hole is limited by a nut, the plate shape of the stamping plate (12) is the same as the plate shape design of the assembly template (11), and the center position of the stamping plate (12) and the feeding box (121) are both provided with a through hole for lifting and sliding the stamping part (112).

3. The anti-cracking forming mold for the heat shield of an automobile exhaust system according to claim 1, characterized in that: An assembly part (211) is fixedly arranged at the center position of the bottom of the lower mold (21).

4. The anti-cracking forming mold for the heat shield of an automobile exhaust system according to claim 1, characterized in that: The telescopic rod (222) is located at the center of the hydraulic spring (221), and the upper ends of the hydraulic spring (221) and the telescopic rod (222) are both fixed above the inside of the hydraulic chamber (212).

5. The anti-cracking forming mold for the heat shield of an automobile exhaust system according to claim 1, characterized in that: A heat-conducting core is arranged inside the heat-conducting seat (224), and the core and the heat-induction element (223) are arranged in a plug-in structure.

6. The anti-cracking forming mold for the heat shield of an automobile exhaust system according to claim 1, characterized in that: Initially, the induction heating element (223) and the heat-conducting seat (224) are not within the annular range of the induction coil (227), and the electrical terminals of the induction coil (227) extend out of the lower mold (21) after insulation isolation and are connected to external electrical control equipment.

7. The anti-cracking forming mold for the heat shield of an automobile exhaust system according to claim 1, characterized in that: The isolated heat-conducting frame (225) is composed of an isolation sleeve and a heat-conducting core material fixed inside the isolation sleeve, wherein the isolation sleeve is fixed inside the lower mold (21), and one end of the heat-conducting core material is connected to the core body inside the heat-conducting seat (224).

8. The anti-cracking forming mold for the heat shield of an automobile exhaust system according to claim 1, characterized in that: The heat conduction cavity (2131) is arranged at intervals just below the stamping die groove (213) inside the lower mold (21), and the heat conduction cavity (2131) is arranged to surround half of the diameter of the stamping die groove (213).

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