Die change locking mechanism for automobile bumper stamping die

Abstract

The invention discloses an automobile bumper stamping die change locking mechanism and relates to the technical field of automobile stamping dies, a stamping base is used as a basic support, vertical force bearing columns on the periphery of the stamping base are connected with a top protection plate, a central power execution cylinder of the protection plate is connected with a workpiece bearing table through a hydraulic driving rod, and an upper die opposite to a lower die is mounted at the lower end of the bearing table. According to the mold rapid locking mechanism, adjusting supporting blocks are welded to the two sides of a base table, and transmission screws on the adjusting supporting blocks can adjust the position of a locking control box; a rotating gear in the box is meshed with an L-shaped clamping arm tooth block, a rubber clamping pad at the front end of a driving arm and a rubber extrusion block in front of the box, a lower die is clamped from the periphery and the two sides, a stroke limiting supporting column of a supporting base is matched with a bearing table guiding structure to ensure stable lifting, and the bearing table is provided with an infrared mistaken touch prevention sensor and a safety relay module to guarantee safety. The upper die is detachably installed through the lifting lug plate and the fastening nut, the scrap collecting bin automatically enters and exits through the driving motor and the transmission screw, and the stamping die changing requirement of the bumper is met.

Description

Technical Field

[0001] This invention relates to the field of automotive stamping die technology, specifically to a mold changing and locking mechanism for automotive bumper stamping dies. Background Technology

[0002] As an important safety and appearance component of the car body, the car bumper is mostly a large-sized curved surface. It needs to be formed under high pressure using special stamping dies. As the pace of car model iteration accelerates, the production line needs to frequently change the stamping dies corresponding to different bumper models. Therefore, the efficiency of die changing and the stability of locking directly affect the production cycle and product precision. Currently, the mold locking mechanism of automotive bumper stamping equipment in the industry generally adopts the traditional solution of "multiple bolt fixing + manual calibration": the lower mold is usually directly fixed to the mold base by 4-6 through bolts. When changing the mold, it is necessary to use a wrench to remove the bolts one by one, then use a crane to lift the mold to the designated position, then manually adjust the horizontal position and verticality of the mold, and finally tighten all the bolts to complete the fixing. The upper mold is bolted to the workpiece support platform through a flange. When changing the mold, it is also necessary to remove multiple connecting bolts and repeatedly calibrate the alignment of the upper and lower molds to avoid misalignment during stamping. However, this existing technology has significant shortcomings: low mold changing and locking efficiency and poor stability. On the one hand, the steps of bolt disassembly, manual calibration, and bolt re-tightening during mold changing are cumbersome, and a single mold changing takes 30-60 minutes. Especially in the scenario of multi-model small-batch production, frequent mold changing leads to production line downtime accounting for more than 20%, which seriously restricts production efficiency. On the other hand, uneven tightening force is prone to occur when manually tightening bolts. After the mold is unbalanced, it is easy to produce slight displacement. However, car bumpers have extremely high requirements for surface accuracy. Mold displacement will directly lead to defects such as wrinkles and surface deviations in stamped parts. In addition, although some improvement solutions attempt to use pneumatic grippers to replace some bolts, the gripper stroke adjustment flexibility is insufficient and cannot adapt to the locking requirements of bumper molds of different sizes. Therefore, the core contradiction between mold changing efficiency and locking stability has not been fundamentally resolved. Summary of the Invention

[0003] The purpose of this invention is to provide a mold changing and locking mechanism for automobile bumper stamping dies, so as to solve the problems of cumbersome mold locking operation, reliance on multiple tools and difficulty in ensuring positioning accuracy in the mold changing process of existing automobile bumper stamping dies, resulting in low mold changing efficiency and inability to adapt to the rapid production needs of multiple bumper models.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a mold changing and locking mechanism for stamping dies of an automobile bumper, comprising a stamping base, a workpiece bearing platform, and a quick-locking mechanism for the die; vertical support columns are welded around the upper surface of the stamping base, guide grooves are respectively opened on the inner surface of the vertical support columns, a top protective plate is fixedly connected to the upper end of the vertical support columns, a power actuator cylinder is bolted to the center of the upper surface of the top protective plate, a workpiece bearing platform is provided at the lower end of the top protective plate, and an upper die is attached to the lower end of the workpiece bearing platform; a die frame mounting base is provided at the center of the upper surface of the stamping base, and a lower die is placed at the center of the upper surface of the die frame mounting base, with the lower die and the upper die being arranged opposite each other; a groove is opened in the center of the interior of the stamping base, and a debris collection bin is installed inside the groove; The mold quick locking mechanism is set in two groups and symmetrically distributed. Each group includes a locking control box and an adjusting support block. The lower ends of the adjusting support blocks are respectively welded to both sides of the upper surface of the mold frame mounting base. A locking control box is respectively set at the upper end of the adjusting support block. A rubber extrusion block is respectively installed at the front end of the locking control box, and the rubber extrusion block abuts against both sides of the lower mold. The locking control box has through slots on both sides of its surface. L-shaped clamping arms are fitted inside the through slots. Rubber clamping pads are provided on the inner surface of the front end of the L-shaped clamping arms. The rubber clamping pads are clamped around the outer end surface of the lower mold. The rear end of the L-shaped clamping arms extends into the interior of the locking control box. Several tooth blocks are arranged on the rear end surface of the L-shaped clamping arms. The locking control box also has a rotating gear in the center, and the outer end of the rotating gear is synchronously meshed with the outer ends of the tooth blocks installed on the two L-shaped clamping arms. A manual adjustment handle is fixedly connected to the upper surface of the rotating gear extending out of the upper part of the locking control box.

[0005] Preferably, two support seats are installed on both sides of the upper surface of the stamping base. A travel limit column is fixedly connected to the upper end of each support seat, and the upper end of each travel limit column is fixedly connected to the lower surface of the top protective plate. A buffer and shock-absorbing spring is sleeved on the lower outer end of each travel limit column.

[0006] Preferably, guide blocks are welded to both sides of the workpiece bearing platform, and lateral limiting ear plates are connected to both sides of the outer end of the guide blocks. The lateral limiting ear plates are respectively fitted into the guide grooves opened on the inner side of the vertical bearing column. A damping roller is installed in the center of the inner side of each lateral limiting ear plate, and the surface of the damping roller rolls and fits against the inner surface of the guide groove. Two through holes are opened on both sides of the two guide blocks, and the interior of the through holes is respectively fitted into the outer end of the stroke limiting support column.

[0007] Preferably, a safety relay module is installed on one side of the upper surface of the workpiece support platform, and infrared anti-accidental touch sensors are also installed around the lower surface of the workpiece support platform; a mounting groove is opened in the center of the lower surface of the workpiece support platform, and mounting screws are welded around the inner wall of the mounting groove.

[0008] Preferably, the lower output end of the power actuator cylinder is connected to two hydraulic drive rods, and the lower ends of the hydraulic drive rods are fixedly connected to both sides of the upper surface of the workpiece support platform. An audible and visual alarm is also provided on the outer side of the power actuator cylinder.

[0009] Preferably, the upper surface of the upper mold is fitted into the mounting groove opened on the lower surface of the workpiece support platform. Lifting lugs are welded around the upper surface of the upper mold, and the lifting lugs are fitted onto the outer end of the mounting screw. A clamping plate is attached to the lower surface of each lifting lug, and the center of the clamping plate is fitted onto the outer end of the mounting screw. A fastening nut is provided at the lower end of the clamping plate, and the internal thread of the fastening nut is fitted onto the outer end of the mounting screw. The upper surface of the fastening nut is tightly attached to the lower surface of the clamping plate.

[0010] Preferably, each of the two adjusting support blocks has a sliding groove on both sides of its surface, and a longitudinal sliding groove is formed in the center of the upper surface of the adjusting support block. A transmission screw is provided inside each sliding groove, and one end of the transmission screw extends out of the outer end of the adjusting support block and is fixedly connected to an adjusting handle.

[0011] Preferably, the lower ends of the two locking control boxes are slidably sleeved on the upper ends of the adjusting support block, and guide protrusions are respectively provided on the inner surface of the lower end of the locking control box, and the guide protrusions are correspondingly sleeved inside the slide groove; a guide block is connected to the center of the lower end surface of the locking control box, and a threaded hole is opened in the center of the guide block, and the guide block is slidably sleeved in the slide groove on the upper surface of the adjusting support block, and the threaded hole is threaded onto the outer end of the transmission screw.

[0012] Preferably, slide rails are fixedly connected to both sides of the surface of the debris collection bin, and a threaded hole is provided in the center of the rear end of the slide rail; a front baffle is movably connected to the front surface of the debris collection bin, and locking keys are installed on both sides of the front surface of the front baffle; connectors are fixedly installed on the front surface of the slide rails, and the front surface of the connectors is movably sleeved on the outer end of the locking key.

[0013] Preferably, two drive motors are respectively installed on one side surface of the outer end of the stamping base. A transmission screw is fixedly connected to the output end of each of the two drive motors, and the transmission screw passes through the interior of the stamping base and is threaded into the threaded hole of the slide rail.

[0014] Compared with the prior art, the beneficial effects of the present invention are: This invention allows the locking control box to move laterally to accommodate molds of different sizes simply by manually adjusting the handle drive transmission structure. Rotating the adjustment handle then drives the clamping arm to clamp the mold synchronously via gear transmission. The entire process requires no additional tools, reducing operation time to 5-10 minutes. For the upper mold, the installation and disassembly can be completed simply by tightening the nut through the cooperation of the lifting ear plate, pressure plate, and fastening nut. Furthermore, the mating structure of the mounting groove and screw can accommodate upper molds of different thicknesses and sizes. This design not only simplifies the mold changing process but also flexibly adapts to various specifications of automotive bumper molds, reducing the difficulty of mold changing.

[0015] This invention utilizes a workpiece support platform that slides along the guide groove of the vertical support component via a lateral limiting structure. Rollers reduce sliding friction, and a through-hole works in conjunction with a stroke limiting component to create a double guiding constraint, ensuring precise lifting trajectory of the support platform and effectively controlling mold closing deviation within 0.1mm. Furthermore, a buffer spring at the lower end of the stroke limiting component absorbs impact energy before mold closing, preventing hard contact between the upper and lower molds and reducing the risk of surface scratches and deformation. The mold locking mechanism employs rubber-based extrusion and clamping components, enhancing clamping stability and preventing mold wear caused by direct metal contact, further extending mold lifespan and reducing mold maintenance costs during production.

[0016] In terms of safety protection, the present invention is equipped with an anti-accidental touch sensor on the workpiece support platform, which can scan the stamping area in real time. Once a person's limb or foreign object is detected to have entered the machine, the safety circuit is immediately triggered to stop the machine. At the same time, the audible and visual alarm will issue a warning signal, which greatly reduces the incidence of safety accidents. In terms of debris removal, the drive component drives the transmission screw to rotate, which can drive the debris collection bin to automatically enter and exit the equipment. No manual entry into the equipment is required. Debris can be removed simply by opening the baffle after the collection bin is extended. The debris removal time is reduced to 1 / 3 of the original technology. Moreover, there is no need to completely stop the machine during the debris removal process (only the stamping operation needs to be paused), which reduces production interruption time, improves operational safety, and ensures the continuous operation efficiency of the production line. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the workpiece support platform and upper mold structure of the present invention; Figure 3 This is a schematic diagram of the upper surface structure of the stamping base of the present invention; Figure 4 This is a schematic diagram of the debris collection chamber structure of the present invention; Figure 5 This is a schematic diagram of the stroke limiting support structure of the present invention; Figure 6 This is a schematic diagram of the mold quick locking mechanism of the present invention; Figure 7 This is a further structural schematic diagram of the mold quick locking mechanism of the present invention.

[0018] In the diagram: 1. Stamping base; 2. Vertical support column; 3. Top protective plate; 4. Power actuator cylinder; 41. Hydraulic drive rod; 42. Audible and visual alarm; 5. Debris collection bin; 51. Box front baffle; 52. Slide rail; 53. Locking key; 54. Connecting piece; 6. Workpiece support platform; 61. Guide block; 62. Lateral limiting ear plate; 63. Damping roller; 64. Safety relay module; 65. Infrared anti-accidental touch sensor; 66. Mounting screw; 7. Mold frame mounting base; 8. Upper mold; 81. Lifting ear plate; 82. Clamping plate; 83. 1. Fastening nut; 9. Lower mold; 10. Drive motor; 101. Transmission screw; 11. Support base; 111. Stroke limit support; 112. Buffer and shock absorption spring; 12. Mold quick locking mechanism; 13. Locking control box; 131. Guide protrusion; 132. Guide block; 133. Rubber extrusion block; 134. Manual adjustment handle; 135. L-shaped clamping arm; 136. Tooth block; 137. Rotary gear; 138. Rubber clamping pad; 14. Adjusting support block; 141. Slide groove; 142. Transmission screw; 143. Adjusting handle. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1-7As shown, the present invention provides a technical solution: a mold changing and locking mechanism for a car bumper stamping die, which is based on a stamping base 1. Vertical support columns 2 with guide grooves are welded around the upper surface of the stamping base 1. A top protective plate 3 is fixedly connected to the upper end of each vertical support column 2. Two support seats 11 are installed on both sides of the upper surface of the stamping base 1. Each support seat 11 has a travel limit column 111 fixedly connected to its upper end. The upper end of each travel limit column 111 is fixedly connected to the lower surface of the top protective plate 3. A buffer and shock-absorbing spring 112 is sleeved on the lower outer end of each travel limit column 111, forming a stable structure with buffering capacity. The frame structure can offset the vibration and impact during the stamping process. A power actuator cylinder 4 is bolted to the center of the upper surface of the top protective plate 3. Two hydraulic drive rods 41 are connected to the lower output end of the power actuator cylinder 4. The lower ends of the hydraulic drive rods 41 are fixedly connected to both sides of the upper surface of the workpiece support platform 6, providing power for the stamping movement of the upper die 8. An audible and visual alarm 42 is also installed on one side of the power actuator cylinder 4 to issue a warning in abnormal working conditions. The workpiece support platform 6 serves as the mounting and movement carrier for the upper die 8. Guide blocks 61 are welded to both sides of its surface. Lateral limiting ear plates 62 are connected to the outer ends of the guide blocks 61. The lateral limiting ear plates 62 are respectively fitted into the guide grooves opened inside the vertical support column 2. Damping rollers 63 are installed in the center of each lateral limiting ear plate 62, and the surfaces of the damping rollers 63 roll against the inner surface of the guide grooves. Simultaneously, two through holes are opened on each side of the surface of the two guide blocks 61, and the through holes are respectively fitted into the outer ends of the stroke limiting support column 111 to ensure that the support platform rises and falls smoothly along a fixed trajectory and avoids deviation. An installation groove is opened in the center of the lower surface of the workpiece support platform 6, and installation screws 66 are welded to the four sides of the inner wall of the installation groove. The upper surface of the upper mold 8 is correspondingly assembled inside the installation groove, and the upper surface of the upper mold 8 is respectively fitted with... Lifting lugs 81 are welded on and fitted onto the outer end of the mounting screw 66. A clamping plate 82 is attached to the lower surface of each lifting lug 81. The center of the clamping plate 82 is fitted onto the outer end of the mounting screw 66. A fastening nut 83 is provided at the lower end of the clamping plate 82. The internal thread of the fastening nut 83 is fitted onto the outer end of the mounting screw 66, and its upper surface is tightly fitted onto the lower surface of the clamping plate 82, enabling convenient assembly and disassembly and reliable fixation of the upper mold 8. A safety relay module 64 is installed on one side of the upper surface of the workpiece bearing platform 6, and infrared anti-accidental touch sensors 65 are installed around the lower surface to monitor the operating area in real time and prevent accidental touches that could lead to safety accidents.A die frame mounting base 7 is provided at the center of the upper surface of the stamping base 1. A lower die 9 is placed at the center of the upper surface of the die frame mounting base 7. The lower die 9 is positioned opposite to the upper die 8. Two sets of die quick-locking mechanisms 12 are provided and symmetrically distributed on both sides of the die frame mounting base 7 for quick positioning and locking of the lower die 9. Each set of die quick-locking mechanisms 12 includes a locking control box 13 and an adjusting support block 14. The lower ends of the adjusting support blocks 14 are welded to both sides of the upper surface of the die frame mounting base 7. Slide grooves 141 are respectively opened on both sides of the surface of the two adjusting support blocks 14, and a groove is opened at the center of the upper surface. There is a longitudinal slide groove, and each slide groove is equipped with a transmission screw 142. One end of the transmission screw 142 extends out of the outer end of the adjusting support block 14 and is fixedly connected to an adjusting handle 143. The transmission screw 142 can be driven by rotating the adjusting handle 143 to adjust the lateral position of the locking control box 13, adapting to lower molds 9 of different sizes. The lower end of the locking control box 13 is slidably sleeved on the upper end of the adjusting support block 14. The inner surface of the lower end of the locking control box 13 is provided with guide protrusions 131, which are correspondingly sleeved inside the slide groove 141. The center of the lower end surface of the locking control box 13 is connected to a... A guide block 132 has a threaded hole in its center and slides within a groove on the upper surface of the adjusting support block 14. The threaded hole is threaded onto the outer end of the transmission screw 142. Rubber extrusion blocks 133 are respectively installed on the front end of the locking control box 13, and the rubber extrusion blocks 133 respectively abut against the two sides of the lower mold 9. Through slots are respectively opened on both sides of the surface of the locking control box 13, and L-shaped clamping arms 135 are respectively fitted inside the through slots. Rubber clamping pads 138 are respectively provided on the inner surface of the front end of the L-shaped clamping arms 135, and the rubber clamping pads 138 are respectively clamped around the outer surface of the lower mold 9. The rear ends of the L-shaped clamping arms 135 extend into the interior of the locking control box 13, and several toothed blocks 136 are arranged on their surfaces. A rotating gear 137 is also provided in the center of the locking control box 13. The outer ends of the rotating gear 137 mesh synchronously with the outer ends of the toothed blocks 136 installed on the two L-shaped clamping arms 135. The upper surface of the rotating gear 137 extends out of the upper part of the locking control box 13 and is fixedly connected to a manual adjustment handle 134. Rotating the manual adjustment handle 134 can drive the L-shaped clamping arms 135 to clamp the lower mold 9 around synchronously. The rubber parts can prevent damage to the mold and ensure the locking is firm.A groove is formed in the center of the stamping base 1, and a debris collection bin 5 is installed inside the groove. Slide rails 52 are fixedly connected to both sides of the surface of the debris collection bin 5. A threaded hole is formed in the center of the rear end of each slide rail 52. A front baffle 51 is movably connected to the front surface of the debris collection bin 5. Locking keys 53 are installed on both sides of the front surface of the front baffle 51. Connecting parts 54 are fixedly installed on the front surface of each slide rail 52, and their front surfaces are movably sleeved around the locking keys 53. Two drive motors 10 are installed on one side of the outer end of the stamping base 1. A transmission screw 101 is fixedly connected to the output end of each drive motor 10. The transmission screw 101 passes through the interior of the stamping base 1 and is threaded into the threaded hole in each slide rail 52, driving the debris collection bin 5 to automatically move in and out of the groove, facilitating debris cleaning and bin sealing.

[0021] according to Figure 1 and Figure 2As shown, the power actuator cylinder 4 is bolted to the center of the upper surface of the top protective plate 3. Two hydraulic drive rods 41 are connected to its lower output ends. The lower ends of the hydraulic drive rods 41 are fixedly connected to both sides of the upper surface of the workpiece support platform 6, providing power for the stamping and lifting movements of the workpiece support platform 6 and the upper mold 8. A sound and light alarm 42 is also installed on one side of the power actuator cylinder 4, which can issue sound and light warning signals when abnormal operating conditions occur. The workpiece support platform 6, as the core carrier connecting the power actuator cylinder 4 and the upper mold 8, has guide blocks 61 welded to both sides of its surface. Lateral limiting ears 62 are connected to the outer ends of the guide blocks 61. The lateral limiting ear plates 62 are respectively fitted into the guide grooves opened inside the vertical support column 2, and each lateral limiting ear plate 62 has a damping roller 63 installed in the center of its interior. The surface of the damping roller 63 rolls against the inner surface of the guide groove. At the same time, two through holes are opened on both sides of the surface of the two guide blocks 61, and the interior of the through holes is respectively fitted into the outer end of the stroke limiting column 111. Through the cooperation of the guide block 61, the lateral limiting ear plates 62, the damping roller 63 and the stroke limiting column 111, the workpiece bearing platform 6 is ensured to rise and fall smoothly along a fixed trajectory, avoiding deviation during the stamping process. A safety relay module 64 is installed on one side of the upper surface of the workpiece bearing platform 6, and on the lower surface... Infrared anti-accidental touch sensors 65 are installed around the perimeter. The safety relay module 64 can control the safety circuit of the equipment. The infrared anti-accidental touch sensors 65 can monitor the operating area below the workpiece support platform 6 in real time. If personnel or foreign objects are detected entering the area, the equipment can be stopped to prevent accidental touch from causing safety accidents. A mounting groove is opened in the center of the lower surface of the workpiece support platform 6. Mounting screws 66 are welded to the four sides of the inner wall of the mounting groove. The mounting groove is used to assemble the upper mold 8. The upper surface of the upper mold 8 is fitted into the mounting groove opened in the lower surface of the workpiece support platform 6. Lifting lugs 81 are welded to the four sides of its upper surface. The lifting lugs 81 are fitted onto the mounting screws 66. At the outer end, a clamping plate 82 is attached to the lower surface of the lifting ear plate 81. The center of the clamping plate 82 is sleeved on the outer end of the mounting screw 66, and a fastening nut 83 is provided at the lower end of the clamping plate 82. The internal thread of the fastening nut 83 is sleeved on the outer end of the mounting screw 66, and its upper surface is tightly attached to the lower surface of the clamping plate 82. Through the cooperation of the lifting ear plate 81, the clamping plate 82 and the fastening nut 83, the upper mold 8 can be detachably fixed on the workpiece bearing platform 6, which facilitates the replacement and maintenance of the upper mold 8. At the same time, the upper mold 8 and the lower mold 9 placed in the center of the upper surface of the mold frame mounting base 7 are set opposite to each other to complete the stamping and forming operation of the car bumper.

[0022] according to Figure 3 and Figure 4As shown, the debris collection bin 5 is installed in a groove in the center of the stamping base 1. Slide rails 52 are fixedly connected to both sides of its surface. A threaded hole is provided at the center of the rear end of each slide rail 52. A front baffle 51 is movably connected to the front surface of the debris collection bin 5. Locking keys 53 are installed on both sides of the front surface of the front baffle 51. Connectors 54 are fixedly installed on the front surfaces of the slide rails 52. The front surfaces of the connectors 54 are movably fitted onto the outer ends of the locking keys 53. The cooperation between the locking keys 53 and the connectors 54 allows the front baffle 51 to be fixed and opened, facilitating debris cleaning. The collection chamber is sealed; there are two drive motors 10, which are respectively installed on one side of the outer end of the stamping base 1. The output ends of the two drive motors 10 are fixedly connected to the transmission screws 101. After the transmission screws 101 pass through the inside of the stamping base 1, they are respectively threaded into the threaded holes of the slide rails 52 on both sides of the debris collection chamber 5. By driving the transmission screws 101 to rotate through the drive motors 10, the slide rails 52 and the debris collection chamber 5 can be moved back and forth along the groove of the stamping base 1, so as to realize the automatic entry and exit of the debris collection chamber 5, which facilitates the collection and cleaning of debris generated during the stamping process.

[0023] according to Figure 1 and Figure 5 As shown, there are two support bases 11, which are respectively installed on both sides of the upper surface of the stamping base 1. The upper end of each support base 11 is fixedly connected to a stroke limiting column 111, and the upper end of the stroke limiting column 111 is fixedly connected to the lower surface of the top protective plate 3, forming an auxiliary support structure between the stamping base 1 and the top protective plate 3. At the same time, a buffer and shock-absorbing spring 112 is sleeved on the lower outer end of the stroke limiting column 111, which can offset the vibration and impact during the lifting and pressing of the workpiece bearing platform 6, and play a buffer protection role. In addition, two guide blocks 61 welded on both sides of the surface of the workpiece bearing platform 6 have two through holes on each side of their surface. The inner ends of the stroke limiting columns 111 are respectively sleeved inside the through holes. The support base 11, through the cooperation of the stroke limiting column 111 and the guide block 61, further limits the lifting trajectory of the workpiece bearing platform 6, ensuring that the upper mold 8 maintains stable movement during the stamping operation, avoiding deviation or shaking, and ensuring stamping accuracy and equipment operation stability.

[0024] according to Figure 3 , Figure 6 and Figure 7As shown, the mold quick locking mechanism 12 is configured in two symmetrical sets. Each set includes a locking control box 13 and an adjusting support block 14. The lower ends of the adjusting support blocks 14 are welded to both sides of the upper surface of the mold frame mounting base 7. Slide grooves 141 are respectively opened on both sides of the surface, and a longitudinal slide groove is opened in the center of the upper surface. A transmission screw 142 is provided inside each slide groove. One end of the transmission screw 142 extends out of the outer end of the adjusting support block 14 and is fixedly connected to an adjusting handle 143. The lower end of the locking control box 13 is slidably sleeved on the adjusting support block 14. The upper end of the support block 14 has a guide protrusion 131 on its lower inner surface that is correspondingly fitted into the slide groove 141. The guide block 132 (with a threaded hole in the center) connected to the center of the lower surface is slidably fitted into the slide groove on the upper surface of the adjusting support block 14, and the threaded hole is threaded onto the outer end of the transmission screw 142. Rotating the adjusting handle 143 can drive the transmission screw 142 to rotate, causing the locking control box 13 to move laterally along the adjusting support block 14, adapting to lower molds 9 of different sizes; the front end of the locking control box 13 is respectively equipped with rubber... Rubber extrusion blocks 133 abut against the two sides of the lower mold 9. Each side of the extrusion block has a through groove, and an L-shaped clamping arm 135 is fitted inside each groove. Rubber clamping pads 138 on the inner surface of the front end of each L-shaped clamping arm 135 clamp the outer surface of the lower mold 9. The rear ends of each arm extend into the locking control box 13, and several toothed blocks 136 are arranged on its surface. A rotating gear 137 is located in the center of the locking control box 13, and its outer ends engage with the two L-shaped clamping arms 135. The outer ends of the toothed blocks 136 of the 5 are synchronously engaged for transmission. The upper surface of the rotating gear 137 extends out of the upper part of the locking control box 13 and is fixedly connected to the manual adjustment handle 134. Rotating the manual adjustment handle 134 can drive the rotating gear 137 to rotate. Through the transmission of the toothed blocks 136, the two L-shaped clamping arms 135 are driven to move synchronously towards each other. With the help of the rubber extrusion block 133 and the rubber clamping pad 138, the lower mold 9 is quickly clamped and locked. At the same time, the rubber parts can prevent damage to the surface of the lower mold 9, ensuring the stability of the locking and the integrity of the mold.

[0025] The overall effect achieved by the organization is as follows: In the initial stage, the lower mold 9 and the upper mold 8 are installed and locked. The positioning and locking of the lower mold 9 relies on the mold quick locking mechanism 12. First, the lower mold 9 is placed in the center of the upper surface of the mold frame mounting base 7. According to the size of the lower mold 9, the adjusting handle 143 at the outer end of the adjusting support block 14 is rotated. The adjusting handle 143 drives the transmission screw 142 on its inner side to rotate. Because the guide block 132 at the lower end of the locking control box 13 is threadedly connected to the transmission screw 142, and the locking control box 13 is connected to the guide protrusion Block 131 slides along the groove 141 of the adjusting support block 14. Therefore, when the transmission screw 142 rotates, it will drive the locking control box 13 to move laterally along the adjusting support block 14 until the two sets of locking control boxes 13 move to the matching positions on both sides of the lower mold 9. Then, the manual adjustment handle 134 at the upper end of the locking control box 13 is rotated, which drives the rotating gear 137 in the center of the box to rotate. Since the rotating gear 137 meshes synchronously with the toothed block 136 at the rear end of the L-shaped clamping arm 135, the rotation of the rotating gear 137 will drive the two sets of L-shaped clamping arms 135 to rotate. The L-shaped clamping arms 135 move towards each other along the through slot of the locking control box 13, until the rubber extrusion block 133 at the front end of the locking control box 13 finally abuts against the two side surfaces of the lower mold 9. The rubber clamping pads 138 at the front end of the L-shaped clamping arms 135 clamp the outer perimeter of the lower mold 9, achieving rapid locking of the lower mold 9. After locking the lower mold 9, the upper mold 8 is assembled and fixed. Relying on the installation structure of the workpiece support platform 6, the upper mold 8 is lifted to the workpiece support platform 6 by hooking the lifting ear plate 81 on the upper surface of the upper mold 8 with the lifting equipment. Above the mounting groove at the lower end of the platform 6, the lifting ear plate 81 is initially positioned by fitting it into the outer end of the mounting screw 66 on the inner wall of the mounting groove. Then, the clamping plate 82 is attached to the lower surface of the lifting ear plate 81, and the fastening nut 83 is tightened at the lower end of the mounting screw 66. The fastening nut 83 pushes the clamping plate 82 upward through the thread drive. The clamping plate 82 further presses the lifting ear plate 81 against the inner wall of the mounting groove of the workpiece platform 6, realizing a rigid connection between the upper mold 8 and the workpiece platform 6. The detachable structure facilitates subsequent mold replacement.After the mold is installed and locked, the stamping preparation stage begins. First, the safety circuit is activated, relying on the safety relay module 64 and the infrared anti-accidental touch sensor 65. Upon equipment startup, the safety relay module 64 on the upper surface of the workpiece support platform 6 automatically activates the safety circuit. Simultaneously, the infrared anti-accidental touch sensors 65 around the lower surface of the workpiece support platform 6 begin real-time scanning of the area below it (the stamping area between the upper mold 8 and the lower mold 9). If the sensor 65 detects a person's limb or foreign object accidentally entering the area, it immediately sends a signal to the safety relay module 64. The module 64 then triggers the equipment to stop to prevent accidental touches. The equipment only enters the ready-to-stamp state when the sensor 65 does not detect any abnormality. Subsequently, the power system is debugged. Relying on the power actuator cylinder 4 and the stroke limit structure, the power actuator cylinder 4 is pre-started, and the two hydraulic drive rods 41 at its lower output end attempt to extend and retract slightly, driving the workpiece support platform 6 to move slightly in the vertical direction. At this time, the guide blocks 61 on both sides of the workpiece support platform 6 slide along the guide groove of the vertical support column 2 through the lateral limit ear plate 62. The damping rollers 63 in the ear plate roll against the groove wall. At the same time, the guide blocks 61 slide along the stroke limit support column 111 through the through hole to ensure that the lifting trajectory of the workpiece support platform 6 is accurate and without deviation. If there is a trajectory deviation or abnormal hydraulic pressure, the audible and visual alarm 42 on the outside of the power actuator cylinder 4 will sound. The light alerts and prompts for troubleshooting; after the stamping preparation is complete, the core stamping operation is executed. Relying on the coordination of the upper die 8 and the lower die 9, the operator confirms that the car bumper blank to be stamped has been placed on the upper surface of the lower die 9, and then initiates the stamping command. The power actuator 4 outputs downward driving force through the hydraulic drive rod 41, causing the workpiece support platform 6 and the upper die 8 to descend at a uniform speed. During the descent, the stroke limit support 111 plays a dual role: firstly, it limits the lifting direction of the workpiece support platform 6 through the through hole of the guide block 61, ensuring precise alignment of the upper die 8 and the lower die 9; secondly, the buffer and shock-absorbing spring 112 at the lower end of the stroke limit support 111... The workpiece support platform 6 is compressed as it descends, absorbing the impact energy before stamping and preventing hard contact between the upper mold 8 and the lower mold 9. When the hydraulic drive rod 41 pushes the upper mold 8 down to fully close with the lower mold 9, the upper mold 8 applies stamping pressure to the blank on the lower mold 9 to complete the forming process of the car bumper. After stamping, the power actuator cylinder 4 drives the hydraulic drive rod 41 to retract upward, causing the workpiece support platform 6 and the upper mold 8 to rise along the original trajectory until they return to the initial height. At this time, the infrared anti-mistouch sensor 65 scans the area again. After confirming safety, the operator can remove the formed car bumper workpiece from the lower mold 9 and enter the next stamping cycle.Metal scraps are generated during the stamping process and eventually collect in the scrap collection bin 5. When the scraps accumulate to a certain amount, the two drive motors 10 on the outside of the stamping base 1 are activated. The transmission screw 101 at the output end of the drive motor 10 rotates. Since the transmission screw 101 is threadedly connected to the threaded holes of the slide rails 52 on both sides of the scrap collection bin 5, the rotation of the transmission screw 101 will drive the slide rails 52 and the scrap collection bin 5 to slide outward along the groove until the collection bin is completely extended outside the stamping base 1. The operator opens the front baffle 51 on the front surface of the scrap collection bin 5 to clean the internal scraps. After cleaning, the drive motor 10 is started in reverse, the transmission screw 101 drives the collection bin to reset, and the front baffle is closed. 51. Lock and complete the debris collection process; when it is necessary to change to a different model of car bumper mold, enter the mold changing stage, and operate according to the process of "first remove the upper mold 8 → then remove the lower mold 9 → reverse the installation of the new mold". When removing the upper mold 8, loosen the fastening nut 83 at the lower end of the mounting screw 66 of the workpiece bearing platform 6, remove the clamping plate 82, and lift the upper mold 8 with the hoisting equipment. When removing the mold 9, rotate the manual adjustment handle 134 of the locking control box 13 in the reverse direction to release the lower mold 9 with the L-shaped clamping arm 135, and then lift the lower mold 9. When installing the new mold, repeat the mold installation steps of the initial stage, first fix the new lower mold, and then assemble the new upper mold. After completing the mold changing, proceed to the next round of stamping preparation.

[0026] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mold changing and locking mechanism for stamping dies of an automobile bumper, comprising a stamping base (1), a workpiece support platform (6), and a quick-locking mechanism for the die (12), characterized in that: The upper surface of the stamping base (1) is welded with vertical support columns (2) on all four sides. Guide grooves are opened on the inner surface of the vertical support columns (2). A top protective plate (3) is fixedly connected to the upper end of the vertical support column (2). A power actuator cylinder (4) is bolted to the center of the upper surface of the top protective plate (3). A workpiece bearing platform (6) is set at the lower end of the top protective plate (3). An upper mold (8) is attached to the lower end of the workpiece bearing platform (6). A mold frame mounting base (7) is set at the center of the upper surface of the stamping base (1). A lower mold (9) is placed at the center of the upper surface of the mold frame mounting base (7). The lower mold (9) and the upper mold (8) are arranged opposite to each other. A groove is opened in the center of the interior of the stamping base (1). A chip collection bin (5) is installed inside the groove. The quick locking mechanism (12) of the mold is set in two groups and symmetrically distributed. Each group includes a locking control box (13) and an adjusting support block (14). The lower ends of the adjusting support blocks (14) are respectively welded to both sides of the upper surface of the mold frame mounting base (7). The upper ends of the adjusting support blocks (14) are respectively provided with locking control boxes (13). The front ends of the locking control boxes (13) are respectively installed with rubber extrusion blocks (133), and the rubber extrusion blocks (133) respectively abut against the two sides of the lower mold (9). The locking control box (13) has through slots on both sides of its surface. L-shaped clamping arms (135) are respectively fitted inside the through slots. Rubber clamping pads (138) are respectively provided on the inner surface of the front end of the L-shaped clamping arms (135). The rubber clamping pads (138) are clamped around the outer end surface of the lower mold (9). The rear end of the L-shaped clamping arms (135) extends into the interior of the locking control box (13). Several toothed blocks (136) are arranged on the rear end surface of the L-shaped clamping arms (135). The locking control box (13) is also provided with a rotating gear (137) in the center. The outer end of the rotating gear (137) is synchronously meshed with the outer end of the tooth block (136) installed on the two L-shaped clamping arms (135). The upper surface of the rotating gear (137) extends out of the upper end of the locking control box (13) and is fixedly connected with a manual adjustment handle (134).

2. The mold changing and locking mechanism for automobile bumper stamping dies according to claim 1, characterized in that: Two support seats (11) are installed on both sides of the upper surface of the stamping base (1). A travel limit column (111) is fixedly connected to the upper end of each support seat (11), and the upper end of the travel limit column (111) is fixedly connected to the lower surface of the top protective plate (3). A buffer damping spring (112) is sleeved on the lower outer end of the travel limit column (111).

3. The mold changing and locking mechanism for automobile bumper stamping dies according to claim 1, characterized in that: Guide blocks (61) are welded to both sides of the surface of the workpiece bearing platform (6). Lateral limiting ear plates (62) are connected to both sides of the outer end of the guide blocks (61). The lateral limiting ear plates (62) are respectively sleeved in the guide groove opened inside the vertical bearing column (2). A damping roller (63) is installed in the center of the lateral limiting ear plate (62). The damping roller (63) rolls and fits against the inner surface of the guide groove. Two through holes are opened on both sides of the surface of the two guide blocks (61). The inside of the through holes is respectively sleeved on the outer end of the stroke limiting support column (111).

4. The mold changing and locking mechanism for automobile bumper stamping dies according to claim 3, characterized in that: A safety relay module (64) is installed on one side of the upper surface of the workpiece support platform (6), and an infrared anti-accidental touch sensor (65) is also installed around the lower surface of the workpiece support platform (6); an installation groove is opened in the center of the lower surface of the workpiece support platform (6), and installation screws (66) are welded around the inner wall of the installation groove.

5. The mold changing and locking mechanism for automobile bumper stamping dies according to claim 1, characterized in that: The lower output end of the power actuator cylinder (4) is connected to two hydraulic drive rods (41), and the lower end of the hydraulic drive rods (41) is fixedly connected to both sides of the upper surface of the workpiece support platform (6). An audible and visual alarm (42) is also provided on the outer side of the power actuator cylinder (4).

6. The mold changing and locking mechanism for automobile bumper stamping dies according to claim 4, characterized in that: The upper surface of the upper mold (8) is fitted into the mounting groove on the lower surface of the workpiece support platform (6). Lifting ear plates (81) are welded around the upper surface of the upper mold (8), and the lifting ear plates (81) are fitted onto the outer end of the mounting screw (66). A pressure plate (82) is attached to the lower surface of the lifting ear plates (81), and the center of the pressure plate (82) is fitted onto the outer end of the mounting screw (66). A fastening nut (83) is provided at the lower end of the pressure plate (82), and the internal thread of the fastening nut (83) is fitted onto the outer end of the mounting screw (66). The upper surface of the fastening nut (83) is tightly attached to the lower surface of the pressure plate (82).

7. The mold changing and locking mechanism for automobile bumper stamping dies according to claim 1, characterized in that: The two adjustment support blocks (14) have grooves (141) on both sides of their surfaces, and longitudinal grooves are provided in the center of the upper surface of the adjustment support blocks (14). A transmission screw (142) is provided inside each groove. One end of the transmission screw (142) extends out of the outer end of the adjustment support block (14) and is fixedly connected to an adjustment handle (143).

8. The mold changing and locking mechanism for automobile bumper stamping dies according to claim 7, characterized in that: The lower ends of the two locking control boxes (13) are respectively slidably sleeved on the upper end of the adjusting support block (14). Guide protrusions (131) are respectively provided on the inner surface of the lower end of the locking control box (13), and the guide protrusions (131) are correspondingly sleeved in the inside of the slide groove (141). A guide block (132) is connected in the center of the lower end surface of the locking control box (13), and a threaded hole is opened in the center of the guide block (132). The guide block (132) is slidably sleeved in the slide groove on the upper surface of the adjusting support block (14), and the threaded hole is threaded on the outer end of the transmission screw (142).

9. The mold changing and locking mechanism for automobile bumper stamping dies according to claim 1, characterized in that: The debris collection bin (5) is fixedly connected to slide rails (52) on both sides of its surface, and a threaded hole is provided in the center of the rear end of the slide rail (52); the front surface of the debris collection bin (5) is movably connected to a box front baffle (51), and locking keys (53) are installed on both sides of the front surface of the box front baffle (51); connectors (54) are fixedly installed on the front surface of the slide rail (52), and the front surface of the connectors (54) is movably sleeved on the outer end of the locking key (53).

10. The mold changing and locking mechanism for an automobile bumper stamping die according to claim 9, characterized in that: Two drive motors (10) are respectively installed on one side of the outer end of the stamping base (1). A transmission screw (101) is fixedly connected to the output end of each of the two drive motors (10). The transmission screw (101) passes through the interior of the stamping base (1) and is threaded into the threaded hole of the slide rail (52).

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