A metal piece punching device for an automobile safety air bag

Abstract

The application discloses a metal piece stamping device for automobile safety air bag, and particularly relates to the technical field of stamping processing, which comprises a processing table, a shaping die set and a stamping driver are arranged on the processing table, the shaping die set comprises a lower die and an upper die, a punch part is internally provided with a punching assembly, the punching assembly comprises a punching column, the punching column is obliquely and slidably arranged in the interior of the punch part, one end of the punching column corresponding to a shell part is obliquely arranged upwards, a punching cooperation hole is arranged at a region corresponding to the punching column in a split die, and the split die is vertically and slidably arranged at the bottom of the upper die. After the punching column finishes punching, the split die is controlled to move downwards by a distance relative to the upper die, the acute angle region formed by the top of the punching cooperation hole and the outer wall part of the shell part is used to extrude and cut the burrs outside the top of the jet hole downwards, so that the burrs are separated, burr scratches on the inner wall of the die are avoided, and the forming quality of the product and the service life of the die are effectively improved.

Description

Technical Field

[0001] This invention relates to the field of stamping technology, and more specifically, to a stamping device for metal parts used in automotive airbags. Background Technology

[0002] The core component of an automotive airbag system is the gas generator. Its function is to generate a large amount of harmless gas in a very short time (usually 20-50 milliseconds) after a vehicle collision, which will quickly inflate and deploy the folded airbag. The housing of the gas generator is mainly made of metal and is manufactured by stamping. Multiple air jets are set around the housing so that the gas generated by the gas generator can be filtered and ejected at high speed from here into the airbag.

[0003] To ensure the product quality of the gas generator housing components and reduce stamping springback, a gas generator housing typically requires multiple stamping processing steps (such as progressive die stamping). In the last stamping step of the gas generator housing (when the main body has been formed and further stamping is required to ensure the workpiece is shaped and will not spring back), the side wall of the gas generator housing component is directly punched to complete the final product forming.

[0004] For some gas generators, in order to precisely control the direction and flow of the airflow so that the gas can fill the airbag more quickly (the filling speed of the airbag determines the protection performance of the driver, which is a matter of life and death, and the faster the filling speed, the better), it is necessary to make inclined punches on the side wall of the basically formed shell component during actual processing to obtain upward inclined air jet holes (inclined upward from the inside out) and form the final shell component.

[0005] For example, a punching assembly is provided in the lower die for the area inside the housing component, and a punching fitting hole is provided in the corresponding position in the upper die. This allows the punching post to be inclined upwards when punching from the inside of the housing component to the outside, punching out air jet holes that are inclined upwards from the inside to the outside. However, inclined punching is more prone to producing burrs than vertical punching, and the burrs are mainly concentrated in the outer top area of ​​the formed air jet holes. Moreover, the burrs formed as a whole also have an upward inclined tendency. Since the punching fitting hole is also an inclined hole, the bottom area of ​​the punching fitting hole forms an obtuse angle with the inner wall of the forming cavity. When the upper die moves upward, the bottom area of ​​the punching fitting hole tends to guide and gradually squeeze the burrs on the top outer side of the formed air jet holes, causing the burrs at this point to turn upwards and not be able to deform into the formed air jet holes. As a result, during the separation of the housing component from the upper die, the above-mentioned burrs tend to scrape against the inner wall of the die, affecting the quality of the die and the product. Summary of the Invention

[0006] The present invention provides a metal stamping device for automotive airbags, which aims to solve the problem that burrs formed on the top outer side of the forming air jet hole in existing inclined punching are prone to scratching the inner wall of the mold, affecting the quality of the mold and the product.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a metal stamping device for automotive airbags, comprising a processing table, on which a shaping mold assembly and a stamping driver are provided. The shaping mold assembly includes a lower mold and an upper mold, the upper mold being vertically slidably disposed above the lower mold and mounted on the output end of the stamping driver. A punch portion is provided at the top of the lower mold, a forming cavity is provided below the upper mold, and a split mold is also provided at the bottom of the upper mold. A punching assembly is provided inside the punch portion, the punching assembly including a punching post, the punching post being obliquely slidably disposed inside the punch portion, one end of the punching post corresponding to the housing component being obliquely upwardly disposed, and a punching mating hole is provided in the area of ​​the split mold corresponding to the punching post. The split die is vertically slidably installed at the bottom of the upper die. A micro-motion actuator is installed in the upper die. The split die is driven up and down by the micro-motion actuator. The punching mating hole is an inclined hole adapted to the punching post.

[0008] Preferably, the lower die and the stamping driver are both fixedly mounted on the processing table, the micro-motion driver is fixedly mounted inside the upper die, the punch is used to place the housing component, the punch is provided with a corresponding inclined guide hole, and the punching post is installed in the inclined guide hole.

[0009] Preferably, a tapered push head is slidably disposed inside the lower die. The tapered push head is driven to move up and down by a push driver. The top of the tapered push head is provided with a tapered surface. The end of the punching post away from the housing component slides and adapts to the tapered surface of the tapered push head. A reset drive structure is also provided between the punching post and the punch part.

[0010] Preferably, the interior of the split mold is also provided with a scrap cavity, and each punching and fitting hole is connected to the scrap cavity. A material extraction pipe is installed on the split mold, which is connected to the scrap cavity and is connected to an air extraction device.

[0011] Preferably, a flange is provided at the bottom edge of the shell component, and a flange pressure plate is vertically slidably connected to the bottom of the split mold. The flange pressure plate is provided corresponding to the flange and fits snugly with the top and edge of the flange. An elastic connector is provided between the split mold and the flange pressure plate.

[0012] Preferably, a sealing cavity is provided in the area corresponding to the conical ejector head in the lower die, and a manifold cavity is provided in the area corresponding to the top of the conical ejector head in the punch part. A cryogenic gas injection pipe is also fixedly installed on the lower die, and the cryogenic gas injection pipe is connected to a cryogenic gas supply source. An internal blowing hole is provided inside the punching column. One end of the internal blowing hole extends to the punching end of the punching column, and the other end of the internal blowing hole extends to the area of ​​the punching column near the conical ejector head and communicates with the manifold cavity. A connecting flow channel is provided in the conical ejector head. The connecting flow channel communicates with the cryogenic gas injection pipe through the sealing cavity, and the top end of the connecting flow channel communicates with the manifold cavity.

[0013] Preferably, a guide sleeve is installed in the inclined guide hole in the punch portion, and a guide air passage for connecting the manifold is provided on the inclined guide hole. The guide air passage extends to the guide sleeve, the punching post slides through the guide sleeve, and a flat cavity surrounding the punching post is provided inside the guide sleeve.

[0014] The waste chamber is an annular cavity surrounding the molding cavity. A material control ring is rotatably installed inside the molding cavity. The material control ring is located in the upper area of ​​the waste chamber. Multiple push plates are fixedly connected to the material control ring. A rotation drive assembly is also provided inside the split mold to drive the split mold to rotate.

[0015] The rotation drive assembly is a combination of a material extraction pipe and an air blowing pipe. The air blowing pipe is fixedly installed on the split mold and is connected to the waste material cavity. The air blowing pipe is connected to an air blowing pump. Inclined air passages are provided between the material extraction pipe and the waste material cavity, as well as between the air blowing pipe and the waste material cavity. The inclined air passages are inclined into the waste material cavity, and the inclination directions of the two sets of inclined air passages are opposite.

[0016] Preferably, an electromagnet is embedded in the pusher plate, and the energized end of the electromagnet extends upward to the top of the pusher plate. A conductive ring is fixedly installed on the top wall of the waste chamber. The conductive ring is connected to an external power source. A notch is provided in the area of ​​the conductive ring corresponding to the extraction tube. The energized end of the electromagnet slides in contact with the conductive ring.

[0017] The beneficial effects of this invention are as follows: 1. After the punching column completes punching, the present invention controls the conical pusher head to descend a certain distance, causing the punching column to retract and the punching end of the punching column to fit with the outer wall of the housing component. Then, the split mold is controlled to move down a certain distance relative to the upper mold. By using the acute angle area formed by the top of the punching hole corresponding to the outer wall of the housing component, the burrs on the outer side of the top of the air jet hole are squeezed and cut downward to remove the burrs. Afterward, when the split mold and the upper mold are moved up as a whole for mold separation, no burrs will scratch the inner wall of the mold, effectively improving the molding quality of the product and the service life of the mold.

[0018] 2. The waste material from the punching process of this invention can slide and be stored in the waste material cavity. By driving the split mold to rotate, the pusher plate continuously carries the waste material to the extraction tube, which can facilitate the extraction tube to better suck up the waste material, thereby realizing the function of automatic waste discharge and improving the practicality of the equipment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a schematic diagram from another perspective of the present invention.

[0021] Figure 3 This is a schematic diagram of the overall structure of the mold assembly of the present invention.

[0022] Figure 4 This is a state diagram of the assembly of the mold for the present invention.

[0023] Figure 5 For the present invention Figure 4 Enlarged view of the structure of part A.

[0024] Figure 6 This is a schematic diagram of the structure of the punching assembly of the present invention when it is being punched at an angle.

[0025] Figure 7 This is a diagram showing the state of the casing component after the punching post of the present invention forms a burr on the top of the outer side of the air vent.

[0026] Figure 8 This is a schematic diagram showing the fit between the bottom area of ​​the punching hole and the burr when the upper die is raised without any treatment after the burr is formed, according to the present invention.

[0027] Figure 9 This is a diagram illustrating the state of the process after the burr is formed, where the split die is lowered to lower the blanking hole and the acute angle at the top of the blanking hole cuts the burr.

[0028] Figure 10 This is a schematic diagram of the improved molding die assembly according to the present invention.

[0029] Figure 11 This is a diagram showing the state of burr formation and cutting after the improvement of the shaping mold group of the present invention.

[0030] Figure 12 This is a diagram showing the state of cryogenic gas being blown into the forward jet hole before the mold parting in this invention.

[0031] Figure 13 This is a bottom view of the material control rotating ring of the present invention in the waste chamber.

[0032] Figure 14 This is a schematic diagram of the structure of the present invention when an electromagnet is added to the pusher plate.

[0033] Figure 15 This is a schematic diagram of the conductive ring of the present invention.

[0034] Figure 16 This is a schematic diagram of the product structure of the housing component of the present invention.

[0035] The attached figures are labeled as follows: 1. Machining table; 11. Stamping actuator; 12. Transfer robot; 2. Continuous stamping die set; 3. Shaping die set; 31. Lower die; 32. Upper die; 33. Split die; 331. Blanking mating hole; 332. Scrap chamber; 333. Inclined air passage; 34. Flange pressure plate; 341. Elastic connector; 35. Micro-motion actuator; 36. Heating assembly; 37. Cryogenic gas injection pipe; 3 8. Material control rotating ring; 381. Push plate; 382. Electromagnet; 383. Conductive ring; 301. Punch part; 302. Forming cavity; 303. Manifold; 4. Housing component; 41. Air vent; 42. Flange; 5. Punching assembly; 51. Punching column; 511. Internal blow hole; 52. Conical push head; 521. Connecting flow channel; 53. Push driver; 6. Material extraction pipe; 7. Air blowing pipe; 8. Guide sleeve. Detailed Implementation

[0036] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0037] Refer to the instruction manual appendix Figure 1 and Figure 2A metal stamping device for automotive airbags includes a processing table 1, on which a continuous stamping die set 2 and a shaping die set 3 are arranged. The processing table 1 also has a stamping driver 11 adapted to the continuous stamping die set 2 and the shaping die set 3. The continuous stamping die set 2 includes multiple sets of dies, covering the progressive stamping processing from sheet metal to a nearly formed housing component 4, such as trimming, stamping inlet and outlet cylinders, flange forming, and other types of dies. In actual processing, the raw material passes through each die sequentially until the workpiece is basically formed. To reduce workpiece springback, a small portion of the product's processes are concentrated in the shaping die set 3 for final stamping and shaping (e.g., reserving a small amount of deformation allowance in the shaping die). The final stamping is performed at group 3, and the recessed structure on the upper part of the shell component 4 can also be formed at the shaping mold group 3 to improve processing efficiency. Correspondingly, the stamping driver 11 is used to control the closing and opening of the continuous stamping mold group 2 and the shaping mold group 3, that is, to control the upper and lower dies in the corresponding molds to move closer or further apart. In order to facilitate the transfer of materials between the molds, the processing table 1 is equipped with a transfer robot 12 in the area corresponding to the continuous stamping mold group 2 and the shaping mold group 3. The transfer robot 12 can use a mechanical gripper structure that can move between the molds. With the help of the mechanical gripper, the material in the upper mold is clamped and transported to the lower mold to complete the automated operation.

[0038] It should be noted that the above-mentioned stamping driver 11 used to control mold closing and mold opening mainly adopts a hydraulic cylinder to provide sufficient forming pressure. In actual setup, only one set of stamping driver 11 can be set, and corresponding connections can be made between each mold to achieve synchronous driving of all molds. Alternatively, according to specific processing requirements, corresponding stamping drivers 11 can be set for each set of molds to drive them. The transfer robot 12 can also adopt automatic operating mechanisms such as robotic arms commonly used in industrial production. Furthermore, each set of molds in the continuous stamping mold group 2 is also a conventional mold adapted to the specific forming production of the shell part 4. Therefore, the setting of the stamping driver 11, the specific situation of the continuous stamping mold group 2, and the specific selection and design of the transfer robot 12 will not be explained in detail in this embodiment.

[0039] In the above scheme, the shaping die group 3 is mainly used to perform the final shaping of the shell component 4 to avoid the impact of stamping springback on quality. For example, when each die in the continuous stamping die group 2 is shaped, a small amount of deformation allowance is reserved. That is, after a series of stampings by the continuous stamping die group 2, the shell component 4 is only initially formed and has not been completely deformed into a shell product that fully meets the standard. The shaping die group 3 is used for further deformation stamping of the shell component 4, so that the shell component 4 is completely deformed into a component product that meets the size requirements. At the same time, the shaping die group 3 also has the ability to perform concave treatment on the top of the shell component 4 or meet the surface micro-deformation requirements of other parts.

[0040] For details, please refer to the instruction manual appendix. Figure 3 and Figure 4 The shaping mold assembly 3 includes a lower mold 31 and an upper mold 32. The lower mold 31 is fixedly mounted on the processing table 1, and the upper mold 32 is vertically slidably positioned above the lower mold 31 via a guide structure. The upper mold 32 is mounted on the output end of the corresponding stamping driver 11, thereby enabling the stamping driver 11 to control the up and down movement of the upper mold 32 (i.e., the mold closing and opening control of the shaping mold assembly 3). A punch 301 is provided on the top of the lower mold 31. The punch 301 is used to fit into the inner cavity of the housing component 4 and to shape the inner cavity of the housing component 4. At the same time, the punch 301 also serves as a positioning support structure for the housing component 4. Before the shaping mold assembly 3 closes, the housing component 4 is clamped and placed in the punch 301 by the transfer robot 12. The upper mold 32 is positioned on the upper mold 32, and a forming cavity 302 is provided below the upper mold 32. The forming cavity 302 is used to fit with the outer wall of the shell component 4 and cooperate with the punch part 301 to perform the final stamping forming of the shell component 4. A split mold 33 is also provided at the bottom of the upper mold 32, and a flange pressure plate 34 is provided at the bottom of the split mold 33. The forming cavity 302 is formed in the overall structure formed by the upper mold 32, the split mold 33 and the flange pressure plate 34. For example, the area of ​​the forming cavity 302 corresponding to the upper mold 32 is mainly adapted to the top wall of the shell component 4, while the area of ​​the forming cavity 302 corresponding to the split mold 33 is mainly adapted to the circumferential side wall of the shell component 4, and the area of ​​the forming cavity 302 corresponding to the flange pressure plate 34 is mainly adapted to the flange 42.

[0041] A punching assembly 5 is provided in the lower die 31 in the area corresponding to the inside of the punch 301. The punching assembly 5 is used to punch the side wall of the housing component 4. Specifically, the punching assembly 5 includes a punching post 51, which is obliquely slidably disposed inside the punch 301 (the punch 301 is provided with a corresponding oblique guide hole, and the punching post 51 is installed in the oblique guide hole to ensure accurate punching). It is disposed corresponding to the circumferential side wall of the housing component 4. One end of the punching post 51 corresponding to the housing component 4 is obliquely upward. Multiple sets of punching posts 51 are provided, and the multiple sets of punching posts 51 are evenly distributed in the circumferential direction inside the punch 301. In the split die 33, a punching mating hole 331 (i.e., corresponding to the forming cavity 30) is provided in the area corresponding to each punching post 51. The side wall area of ​​die 2), the punching mating hole 331 is used to adapt to the punching post 51 to form a punching process, and the interior of the lower die 31 is also slidably provided with a conical push head 52. The conical push head 52 is driven to move up and down by a push driver 53 (the push driver 53 is fixedly installed on the processing table 1, and the conical push head 52 is fixedly installed on the output end of the push driver 53. In order to provide sufficient power, the push driver 53 is preferably a hydraulic cylinder structure). The top of the conical push head 52 is provided with a conical surface. The end of the punching post 51 away from the housing part 4 is slidably adapted to the conical surface of the conical push head 52. Then, by driving the conical push head 52 to move upward, the punching posts 51 can be driven to move outward to punch the side wall of the housing part 4. For example, refer to the appendix of the instruction manual. Figure 6 After the punching post 51 moves outward to punch, it can push the blanked material into the punching mating hole 331. In addition, the interior of the split die 33 is also provided with a waste cavity 332. Each punching mating hole 331 is connected to the waste cavity 332 and is provided with an inclined ramp so that the blanked material can slide and be stored in the waste cavity 332. If necessary, a corresponding structure can also be provided to discharge the waste, for example, refer to the appendix of the instruction manual. Figure 4 A material extraction pipe 6 is installed on the split mold 33. The material extraction pipe 6 is connected to the waste material chamber 332. The material extraction pipe 6 is connected to an air extraction device. With the help of the high-pressure airflow generated by the air extraction device, small waste materials are extracted (refer to a high-power vacuum cleaner). Alternatively, a corresponding mechanical structure can be set to directly push the waste material. A reset drive structure (such as a spring) is also set between the punching post 51 and the punch part 301 to ensure that the punching post 51 can be reset when the conical push head 52 moves down. If necessary, a mechanical reset structure can also be set. For example, a groove structure can be set directly on the surface of the conical push head 52 to pull the punching post 51 back in the opposite direction when the conical push head 52 descends.

[0042] To ensure effective punching, the punching post 51 can be made of high-speed steel or hard alloy. The area in the split die 33 corresponding to the punching mating hole 331 can also be made of an embedded sleeve structure made of high-speed steel or hard alloy to form the punching mating hole 331, thereby ensuring the punching quality.

[0043] It should be noted that the flange pressure plate 34 is mainly for the flange 42 of the housing component 4, as shown in the attached instruction manual. Figure 16 After forming, flange 42 is used to connect and install the entire gas generator with the corresponding support structure. Flange 42 is mainly in a horizontal state. Therefore, during final shaping, flange pressure plate 34 is needed to compress flange 42 and also to initially position and guide the shell component 4. The area of ​​forming cavity 302 corresponding to flange pressure plate 34 is mainly for fitting flange 42 of shell component 4. Therefore, after flange pressure plate 34 contacts flange 42, it can also prevent circumferential deflection of shell component 4. However, since the split mold 33 needs to be further controlled to descend after punching, and at this time, flange pressure plate 34 also contacts lower mold 31, a deformable support structure needs to be set between split mold 33 and flange pressure plate 34 to form a vertical sliding connection between flange pressure plate 34 and split mold 33. The above-mentioned deformable support structure can be as shown in the appendix to the specification. Figure 5 and attached Figure 6 The elastic connector 341 (e.g., a rubber pad) is used in the process. However, it should be noted that the elastic force provided by the elastic connector 341 must be greater than the resistance when the flange 42 of the housing component 4 is finally shaped. Only when the flange 42 and the housing component 4 are finally formed as a whole, and the split mold 33 is controlled to move downward, will the elastic connector 341 be squeezed and deformed to adapt to the movement of the split mold 33. In addition, the above deformable support structure can also be equipped with a mechanical structure. For example, a ring of fan-shaped blocks that can move radially can be set between the split mold 33 and the flange pressure plate 34. When needed, the fan blocks can be controlled to move outward to create a gap between the flange pressure plate 34 and the split mold 33, which can also ensure the normal movement of the split mold 33.

[0044] The above solution has already satisfied the final shaping and punching process of the housing component 4, as detailed in the attached instruction manual. Figure 7After punching out the upward-sloping air jet 41 from the inside out, burrs are easily formed on the top outer area of ​​the air jet 41. Furthermore, the burrs themselves tend to slope upwards. Since the punching mating hole 331 is also an inclined hole, the bottom area of ​​the punching mating hole 331 forms an obtuse angle with the mating area of ​​the housing component 4. However, if the upper die 32 and the split die 33 are moved directly upwards after punching, the bottom area of ​​the punching mating hole 331 may easily collide with the top of the formed air jet 41. The burrs on the outer side form a guide and are gradually squeezed, causing the burrs at that location to turn upwards and prevent them from deforming into the forming air jet hole 41. This makes the burrs prone to scratching the inner wall of the mold, affecting the quality of the mold and the product. Therefore, in this embodiment, the split mold 33 is slidably installed at the bottom of the upper mold 32. The upper mold 32 is also provided with a micro-motion actuator 35 (preferably a hydraulic cylinder). The split mold 33 is fixedly connected to the output end of the micro-motion actuator 35. The micro-motion actuator 35 is used to drive the split mold 33 to move up and down relative to the lower mold 31.

[0045] For details, please refer to the instruction manual appendix. Figure 9 After the punching post 51 completes punching, the conical pusher head 52 is controlled to descend a certain distance, causing the punching post 51 to retract and the punching end of the punching post 51 to fit with the outer wall of the housing component 4. Then, the split mold 33 is controlled to move down a certain distance relative to the upper mold 32. Using the sharp angle area (similar to a blade) formed by the top of the punching mating hole 331 corresponding to the outer wall of the housing component 4, the burrs on the outer side of the top of the air jet hole 41 are squeezed and cut downwards to remove the burrs. After that, when the split mold 33 and the upper mold 32 are moved up as a whole for mold separation, there will be no burrs scratching the inner wall of the mold, which effectively improves the molding quality of the product and the service life of the mold.

[0046] It should be noted that although burrs may also form in the bottom area of ​​the jet hole 41, during the upward movement of the split mold 33, the bottom area of ​​the punching mating hole 331 can squeeze the burrs at the bottom of the jet hole 41 into the jet hole 41. Therefore, the influence of the burrs at the bottom of the jet hole 41 does not need to be considered.

[0047] Furthermore, in the above scheme, the removed burrs mainly accumulate in the waste chamber 332, and are collected by the suction of the extraction pipe 6. However, for cases with many and small burrs, some burrs may adhere to the punching hole 331 during actual processing and be difficult to remove. In addition, for some housing parts 4, heat treatment is required during final shaping to further reduce material springback. During extrusion, the repeated punching friction of the punching column 51 will also cause the temperature of the punching column 51 to rise further, thus affecting the performance of the punching column 51. Therefore, this embodiment also makes the following improvements to the shaping mold group 3, specifically referring to the appendix of the instruction manual. Figure 10 and Figure 11 The upper mold 32 is equipped with a heating component 36 (e.g., electric heating, hot fluid heating, etc.). The lower mold 31 has a sealing cavity corresponding to the area of ​​the conical push head 52. The punch 301 has a manifold 303 corresponding to the top of the conical push head 52. A cryogenic gas injection pipe 37 is also fixedly installed on the lower mold 31. The cryogenic gas injection pipe 37 is connected to a cryogenic gas supply source, such as a combination of an air pump and cryogenic air. This cryogenic air is cooled by a cooling device and then pumped into the cryogenic gas injection pipe 37. The punching post 51 has an internal blowing hole 511 inside. One end of the internal blowing hole 511 extends to the punching end of the punching post 51, and the other end extends to the area of ​​the punching post 51 near the conical push head 52, communicating with the manifold 303. The conical push head 52... A connecting channel 521 is provided, the bottom end of which is connected to the sealing cavity, thereby connecting the low-temperature gas injection pipe 37 with the connecting channel 521. The top end of the connecting channel 521 is connected to the confluence cavity 303. After each punching process, low-temperature air is introduced into the lower die 31 through the low-temperature gas injection pipe 37 via the low-temperature gas supply source. The low-temperature air is blown from the inside of the inner blow hole 511 to the punching mating hole 331. Referring to the attached diagram of the specification, the transfer robot 12 can be used to cool down the punching column 51 after the shell component 4 is formed, so as to avoid the continuous heating caused by the continuous friction of the punching column 51. At the same time, the blown air also helps to blow the burrs attached to the punching mating hole 331 into the waste cavity 332, preventing burr debris from sliding to other areas.

[0048] In addition, please refer to the appendix to the instruction manual. Figure 11 and Figure 12A guide sleeve 8 is embedded in the area near the outer part of the punch 301. The guide sleeve 8 is positioned within an inclined guide hole, which also has a guide air passage for connecting to the manifold 303. This guide air passage extends to the guide sleeve 8. The punching post 51 slides through the guide sleeve 8, and the guide sleeve 8 forms a clearance fit with the punching post 51 at room temperature. The guide sleeve 8 has a flat cavity surrounding the punching post 51. The guide sleeve 8 is preferably made of a metal material with a high coefficient of thermal expansion (e.g., Cu-Zn alloy), meaning it can shrink significantly when the temperature decreases (this, combined with the internal cavity structure of the guide sleeve 8, makes it easier to shrink when cooled). Specifically, after punching and burr removal, the punching post 51 is reset, causing the punched end of the punching post 51 to retract into a section inside the guide sleeve 8. Then, a low-temperature gas supply source is used to supply low-temperature air. At this time, the punched column 51 and the inner wall of the guide sleeve 8 are basically in contact without obvious gaps. Even if burrs or other debris fall off, they will not enter the area between the punched column 51 and the guide sleeve 8. As air is blown from the inner blowhole 511, the punched column 51 and the guide sleeve 8 are cooled down. At this time, both of them contract, which gradually creates a tiny gap between the guide sleeve 8 and the punched column 51. Then, the low-temperature air in the manifold 303 will also be blown out from this gap. In particular, it can create a blowing effect on the edge of the punched end of the punched column 51, which can effectively prevent burrs and debris from adhering to the edge of the punched end of the punched column 51 and improve the cleaning effect. In subsequent processing, that is, after the cooling stops, the guide sleeve 8 and the punched column 51 return to their original state, the tiny gap is eliminated, and the guide sleeve 8 can still guide the end area of ​​the punched column 51 (the main body is still guided by the inclined guide hole, and the guide sleeve 8 is mainly used to seal the punched column 51 in the non-blowing stage).

[0049] Meanwhile, in order to further improve the waste removal effect in the waste chamber 332, please refer to the appendix of the instruction manual. Figure 11 and Figure 13 The waste chamber 332 is an annular cavity surrounding the molding cavity 302. A material control ring 38 is rotatably installed inside the molding cavity 302. The material control ring 38 is located in the upper area of ​​the waste chamber 332. Multiple pusher plates 381 are fixedly connected to the material control ring 38. A rotation drive assembly is also provided inside the split mold 33. The rotation drive assembly is used to drive the split mold 33 to rotate, thereby causing the pusher plates 381 to continuously carry the waste material to the extraction pipe 6, so that the extraction pipe 6 can better suck up the waste material.

[0050] Regarding the aforementioned rotation drive assembly, a motor or similar structure can be directly installed within the split mold 33 to control the rotation of the material control ring 38 in conjunction with gears. Alternatively, other types of rotation drive assemblies can be installed, for example, as per the appendix of the instruction manual. Figure 13The rotation drive assembly is a combination of a material extraction pipe 6 and an air blowing pipe 7. The air blowing pipe 7 is connected to an air pump and is fixedly installed on the split mold 33. The air blowing pipe 7 is connected to the waste chamber 332. Inclined air passages 333 are provided between the material extraction pipe 6 and the waste chamber 332, as well as between the air blowing pipe 7 and the waste chamber 332. The inclined air passages 333 are inclined into the waste chamber 332, and the two sets of inclined air passages 333 are inclined in opposite directions. In actual use, the material extraction pipe 6 extracts air, and the air blowing pipe 7 blows air, thereby forming an annular airflow in the waste chamber 332. This can blow the waste material to gradually converge towards the material extraction pipe 6, and at the same time drive the pusher plate 381 to rotate, pushing larger waste materials towards the material extraction pipe 6 and causing the waste material to slide out and be collected by the material extraction pipe 6.

[0051] Furthermore, in the above scheme, if the main body of shell component 4 is a steel structure, the following scheme can also be adopted. For details, please refer to the appendix of the instruction manual. Figure 14 and Figure 15 An electromagnet 382 (e.g., an electromagnetic coil) is embedded in the pusher plate 381. The energized end of the electromagnet 382 extends upward to the top of the pusher plate 381. A conductive ring 383 is fixedly installed on the top wall of the waste chamber 332. The conductive ring 383 is connected to an external power source through a power line provided in the split mold 33. A notch is provided in the area of ​​the conductive ring 383 corresponding to the extraction tube 6. The energized end of the electromagnet 382 slides in contact with the conductive ring 383. In actual use, the pusher plate 381 can be made magnetic. With the air blowing from the inner blow hole 511, it can actively attract burrs and other debris, enhancing the effect of burrs and other debris detaching from the punching hole 331. When the pusher plate 381 rotates to the extraction tube 6, that is, when it reaches the notch of the conductive ring 383, the electromagnet 382 is de-energized, the magnetic force disappears, and the previously attracted burrs and other debris can be drawn away by the airflow effect.

[0052] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A stamping device for metal parts for automotive airbags, comprising a processing table (1), wherein a forming die set (3) and a stamping driver (11) are provided on the processing table (1), the forming die set (3) includes a lower die (31) and an upper die (32), the upper die (32) is vertically slidably disposed above the lower die (31), the upper die (32) is mounted on the output end of the stamping driver (11), a punch portion (301) is provided on the top of the lower die (31), and a forming cavity (302) is provided below the upper die (32), characterized in that: The bottom of the upper mold (32) is also provided with a split mold (33). A punching assembly (5) is provided inside the punch part (301). The punching assembly (5) includes a punching post (51). The punching post (51) is slidably disposed inside the punch part (301). The end of the punching post (51) corresponding to the shell component (4) is inclined upward. A punching mating hole (331) is provided in the area of ​​the split mold (33) corresponding to the punching post (51). The split mold (33) is vertically slidably installed at the bottom of the upper mold (32). The upper mold (32) is equipped with a micro-motion actuator (35). The split mold (33) is driven to move up and down by the micro-motion actuator (35). The punching mating hole (331) is an inclined hole adapted to the punching post (51).

2. The stamping device for metal parts for automotive airbags according to claim 1, characterized in that: The lower die (31) and the stamping driver (11) are both fixedly installed on the processing table (1). The micro-motion driver (35) is fixedly installed in the upper die (32). The punch part (301) is used to place the housing component (4). The punch part (301) is provided with a corresponding inclined guide hole. The punching column (51) is installed in the inclined guide hole.

3. The stamping device for metal parts for automotive airbags according to claim 2, characterized in that: The lower die (31) is also slidably provided with a conical pusher head (52). The conical pusher head (52) is driven to move up and down by a pusher driver (53). The top of the conical pusher head (52) is provided with a conical surface. The end of the punching post (51) away from the housing component (4) is slidably adapted to the conical surface of the conical pusher head (52). A reset drive structure is also provided between the punching post (51) and the punch part (301).

4. A metal stamping device for automotive airbags according to claim 3, characterized in that: The interior of the split mold (33) is also provided with a waste chamber (332), and each of the punching mating holes (331) is connected to the waste chamber (332). A material extraction pipe (6) is installed on the split mold (33), and the material extraction pipe (6) is connected to the waste chamber (332). The material extraction pipe (6) is connected to a vacuuming device.

5. A metal stamping device for automotive airbags according to claim 4, characterized in that: The bottom edge of the housing component (4) is provided with a flange (42), and the bottom of the split mold (33) is vertically slidably connected with a flange pressure plate (34). The flange pressure plate (34) is provided corresponding to the flange (42) and fits snugly with the top and edge of the flange (42). An elastic connector (341) is provided between the split mold (33) and the flange pressure plate (34).

6. A metal stamping device for automotive airbags according to claim 5, characterized in that: A sealing cavity is provided in the area corresponding to the conical push head (52) inside the lower die (31), and a manifold cavity (303) is provided in the area corresponding to the top of the conical push head (52) in the punch part (301). A cryogenic gas injection pipe (37) is also fixedly installed on the lower die (31), and the cryogenic gas injection pipe (37) is connected to a cryogenic gas supply source. An internal blowing hole (511) is provided inside the punching column (51), and one of the internal blowing holes (511) is... One end extends to the punched end of the punching post (51), and the other end of the inner blow hole (511) extends to the area of ​​the punching post (51) near the conical pusher head (52) and communicates with the manifold (303). The conical pusher head (52) is provided with a connecting channel (521). The connecting channel (521) communicates with the cryogenic gas injection pipe (37) through a sealing cavity. The top end of the connecting channel (521) communicates with the manifold (303).

7. A metal stamping device for automotive airbags according to claim 6, characterized in that: A guide sleeve (8) is installed in the inclined guide hole in the punch part (301). A guide air passage for connecting the manifold (303) is provided on the inclined guide hole. The guide air passage extends to the guide sleeve (8). The punching post (51) slides through the guide sleeve (8). A flat cavity surrounding the punching post (51) is provided inside the guide sleeve (8).

8. A metal stamping device for automotive airbags according to claim 7, characterized in that: The waste material cavity (332) is an annular cavity surrounding the molding cavity (302). A material control ring (38) is rotatably installed inside the molding cavity (302). The material control ring (38) is located in the area above the waste material cavity (332). Multiple pusher plates (381) are fixedly connected to the material control ring (38). A rotation drive assembly is also provided inside the split mold (33) for driving the split mold (33) to rotate.

9. A metal stamping device for automotive airbags according to claim 8, characterized in that: The rotation drive assembly is a combination of a material extraction pipe (6) and an air blowing pipe (7). The air blowing pipe (7) is fixedly installed on the split mold (33). The air blowing pipe (7) is connected to the waste chamber (332). The air blowing pipe (7) is connected to an air blowing pump. Inclined air passages (333) are provided between the material extraction pipe (6) and the waste chamber (332) and between the air blowing pipe (7) and the waste chamber (332). The inclined air passages (333) are inclined into the waste chamber (332), and the inclination directions of the two sets of inclined air passages (333) are opposite.

10. A stamping device for metal parts for automotive airbags according to claim 9, characterized in that: An electromagnet (382) is embedded in the pusher plate (381). The energized end of the electromagnet (382) extends upward to the top of the pusher plate (381). A conductive ring (383) is fixedly installed on the top wall of the waste chamber (332). The conductive ring (383) is connected to an external power source. A notch is provided in the area of ​​the conductive ring (383) corresponding to the extraction tube (6). The energized end of the electromagnet (382) slides in contact with the conductive ring (383).

Images