Automatic edge covering mechanism for automobile body metal plate

Abstract

The invention belongs to the technical field of vehicle manufacturing, and particularly relates to a vehicle body metal plate automatic edge covering mechanism which comprises a bottom die sliding support, an upper edge covering arm, a lower edge covering arm and a fixed base. After a vehicle plate is moved or transferred to a specified accurate position by equipment of a production line, the bottom die sliding bracket is pushed to a working position by an air cylinder of the fixed base and is matched with the upper edge covering arm and the lower edge covering arm to buckle and press the plate; the upper edge covering arm is connected with the bottom die sliding bracket through a pin shaft, is connected with the lower edge covering arm through a hinge by taking the pin shaft as a fulcrum, and extends out to press a plate under the action of the main hydraulic cylinder; a pre-covering cutter is mounted on the lower edge covering arm, and is matched with the upper edge covering arm after pre-pressing; the fixed base is provided with a sliding rail, and the bottom die sliding support is in sliding fit with the sliding rail. According to the device, the side edge wrapping of the flat-plate-shaped workpiece can be set and adjusted in a wide specification range and can be kept stable under multiple given values, and the defects that manual operation is unreliable and uncontrollable and the like are overcome.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle manufacturing, and in particular relates to an automatic hemming mechanism for a vehicle body sheet metal. Background Art

[0002] With the rapid development of the automobile industry, the appearance of automobiles has changed and diversified. In order to predict market feedback in advance, automobile manufacturers will make prototypes in advance to conduct various tests.

[0003] In the welding production line of the automobile body in white, there is a process of hemming the inner and outer panels of the sheet metal. This type of production process is: the inner and outer panels are placed together, and the inner panel is wrapped by the sheet metal that exceeds the outer panel. In the prototype production line, this process is often completed manually by hammering with a rubber hammer. The result is that the consistency of the hemming state is poor, and there are defects such as warping, wrinkles, and gaps in different parts. This is a serious constraint on the improvement of the quality accuracy of the car body, and it is also a waste of manpower. This urgently requires the development of a simple solution that can ensure the consistency of the hemming state and replace manual gravity operation to achieve quality stability in the entire production process. Summary of the invention

[0004] In order to effectively solve the problems in the above-mentioned background technology, the present invention proposes an automatic hemming mechanism for a car body sheet metal.

[0005] The specific technical solutions are as follows:

[0006] An automatic hemming mechanism for a body sheet metal, comprising a bottom mold sliding bracket, an upper hemming arm, a lower hemming arm and a fixed base;

[0007] After the vehicle panel is moved or transferred to the specified precise position by the equipment of the production line, the bottom mold sliding bracket is pushed to the working position by the cylinder of the fixed base, and the upper hemming arm and the lower hemming arm are buckled to press the panel;

[0008] The upper hemming arm is connected to the bottom mold sliding bracket through a pin shaft, and is connected to the lower hemming arm through a hinge with the pin shaft as a fulcrum, and extends out to press the plate under the action of the main hydraulic cylinder;

[0009] The lower hemming arm is provided with a pre-hemming knife, which is pre-pressed first and then cooperates with the upper hemming arm;

[0010] The fixed base is provided with a slide rail, and the bottom mold sliding bracket is slidably matched with the slide rail.

[0011] A pneumatic cylinder (fast running speed) is used as the power source for the overall sliding of the hemming machine, and a hydraulic cylinder (smooth running) is used as the power source for the clamping of the hemming machine. Two guide rails are used, each with two sliders, to ensure the sliding accuracy of the hemming machine. Two clamping cylinders are used to clamp the hemming machine after it slides into place to ensure that the position remains unchanged during hemming. The structure of the hemming machine is designed as a hinged four-bar mechanism. After the hydraulic cylinder pushes the connecting rod (upper hemming arm), the connecting rod drives another connecting rod to pre-press the plate first, and then the connecting rod (upper hemming arm) is finally in place to clamp the plate to complete the hemming action.

[0012] Preferably, the bottom mold sliding bracket includes a bottom mold, a first lower arm hinge pin, a sliding frame, an upper arm hinge pin bushing assembly, an upper hanging point bearing joint, a hydraulic cylinder, a main cylinder ear shaft left positioning block, a main cylinder ear shaft right positioning block, a sliding block and a telescopic cylinder upper hanging point positioning block; the bottom mold is fixed to the front end of the sliding frame, the first lower arm hinge pin is installed between the two side arms of the sliding frame, the upper arm hinge pin bushing assembly is installed between the two side arms of the sliding frame, the two sides of the hydraulic cylinder are installed on the main cylinder ear shaft left positioning block and the main cylinder ear shaft right positioning block through the hinge shaft, the main cylinder ear shaft left positioning block and the main cylinder ear shaft right positioning block are respectively fixed on the two side arms of the sliding frame, the upper hanging point bearing joint is installed on the piston rod of the hydraulic cylinder, the sliding block is fixed on both sides of the bottom of the sliding frame, and the telescopic cylinder upper hanging point positioning block is fixed at the middle position of the bottom of the sliding frame.

[0013] Preferably, a lower buckling flat limit block and a lower buckling concave limit block are respectively fixed to both sides of the upper part of the sliding frame.

[0014] Preferably, a left in-place limiting bracket and a right in-place limiting bracket are respectively fixed to the front position of the bottom of the sliding frame, and an in-place limiting block is respectively fixed to the left in-place limiting bracket and the right in-place limiting bracket.

[0015] Preferably, the upper edge wrapping arm includes a final edge wrapping knife, an upper edge wrapping arm main arm, an upper edge wrapping arm hinge pin, an upper hanging point pin and a second lower edge wrapping arm hinge pin, the final edge wrapping knife is fixed to the front end of the upper edge wrapping arm main arm, the middle part of the upper edge wrapping arm main arm is connected to the upper hanging point bearing joint through the upper hanging point pin, and the second lower edge wrapping arm hinge pin is installed at the lower part of the upper edge wrapping arm main arm.

[0016] Preferably, an upper buckling flat limit block and an upper buckling convex limit block are respectively fixed on both sides of the upper bag arm main arm, and the upper buckling flat limit block and the upper buckling convex limit block are respectively in contact with and cooperate with the corresponding lower buckling flat limit block and the lower buckling concave limit block.

[0017] Preferably, the lower edge wrapping arm includes a pre-wrapping knife, a lower edge wrapping arm main arm, a lower edge wrapping arm connecting rod and a third lower edge wrapping arm hinge pin, the pre-wrapping knife is fixed at the front end of the lower edge wrapping arm main arm, the middle part of the lower edge wrapping arm main arm is hinged to one end of the lower edge wrapping arm connecting rod through the third lower edge wrapping arm hinge pin, the other end of the lower edge wrapping arm connecting rod is connected to the second lower edge wrapping arm hinge pin through a bushing assembly, and the lower end of the lower edge wrapping arm main arm is connected to the first lower edge wrapping arm hinge pin through a bushing assembly.

[0018] Preferably, the sliding base includes a base bottom plate, a base slide, a left slide rail, a right slide rail, an in-place clamping cylinder and a slide pushing cylinder, the machine base slide is fixed on the base bottom plate, the left slide rail and the right slide rail are respectively fixed on the base slide, both sides of the slide pushing cylinder are installed on the base bottom plate through sliding cylinder ear shaft positioning blocks, the piston rod of the slide pushing cylinder is connected to the bottom of the sliding frame, the in-place clamping cylinder is fixed to the side of the base slide, and a in-place clamping block is installed on the piston of the in-place clamping cylinder, and the in-place clamping block cooperates with the sliding frame clamping limit block located on the side of the sliding frame.

[0019] Preferably, a sliding frame retraction limit block is fixed to the side of the sliding frame, and the sliding frame retraction limit block cooperates with a retraction limit block fixed on a retraction support, and the retraction support is fixed on the base bottom plate.

[0020] Preferably, the pre-packing cutter is located between the final packing cutter and the bottom mold.

[0021] The beneficial effects of the present invention are as follows: the present invention enables the side wrapping of flat workpieces to be set and adjusted within a wide range of specifications, and can remain stable under multiple given values, and overcomes the defects of unreliable and uncontrollable manual operation. Especially for batch wrapping, it can be completed quickly, far exceeding the speed of manual work; and at the same time greatly saves labor and manpower. The system realizes the side wrapping of flat workpieces with a compact and simple structure, and its control system is highly structured and systematic, easy to adjust; it is very easy to form a complete set of equipment systems with high cost performance. The whole is easy to mass produce; the system maintenance and repair are simple and easy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 An exploded view of the present invention;

[0023] Figure 2 A perspective view of the present invention;

[0024] Figure 3 It is an exploded view of the bottom mold sliding bracket of the present invention;

[0025] Figure 4 It is an exploded view of the upper hemming arm of the present invention;

[0026] Figure 5 It is an exploded view of the lower hemming arm of the present invention;

[0027] Figure 6 is an exploded view of the sliding base in the present invention;

[0028] Figure 7 This is the initial working state diagram of the present invention;

[0029] Figure 8 A state diagram of the work in progress for this invention;

[0030] Fig. 9 This is a state diagram after the work in the present invention is completed.

[0031] In the figure: 1. bottom mold sliding bracket; 1.1. bottom mold; 1.2. first lower arm hinge pin; 1.3. sliding frame; 1.4. lower buckle flat limit block; 1.5. lower buckle concave limit block; 1.6. upper arm hinge pin bushing assembly; 1.7. upper hanging point bearing joint; 1.8. hydraulic cylinder; 1.9. left positioning block of main cylinder ear shaft; 1.10. right positioning block of main cylinder ear shaft; 1.11. sliding frame clamping limit block; 1.12. sliding frame clamping limit block; 1.13. sliding frame retracting limit block; 1.14. sliding frame retracting limit block; 1.15-1.18. sliding block; 1.19. telescopic cylinder upper hanging point positioning block; 1.20. left in-place limit bracket; 1.21. right in-place limit bracket; 1.22-1.25. in-place limit blocks;

[0032] 2. Upper hemming arm; 2.1. Final hemming knife; 2.2. Main arm of upper hemming arm; 2.3. Hinge pin of upper hemming arm; 2.4. Upper hanging point pin; 2.5. Hinge pin of second lower hemming arm; 2.6. Upper buckle flat limit block; 2.7. Upper buckle convex limit block; 2.8. Knife edge positioning block;

[0033] 3. Lower hemming arm; 3.1. Pre-hemming knife; 3.2. Lower hemming arm main arm; 3.3. Lower hemming arm connecting rod; 3.4. Third lower hemming arm hinge pin; 3.5-3.7. Positioning pin shaft bushing assembly;

[0034] 4. Fixed base; 4.1. Base bottom plate; 4.2. Base slide; 4.3. Left slide rail; 4.4. Right slide rail; 4.5. Left retracted support; 4.6. Right retracted support; 4.7. Left extended support; 4.8. Right extended support; 4.9. Left extended limit block; 4.10. Right extended limit block; 4.11. Right retracted limit block; 4.12. Left retracted limit block; 4.13. Left in-place clamping connector; 4.14. Left in-place clamping cylinder; 4.15. Left in-place clamping block; 4.16. Right in-place clamping cylinder; 4.17. Right in-place clamping connector; 4.18. Right in-place clamping block; 4.19. Slide push cylinder; 4.20. Left sliding cylinder ear shaft positioning fast; 4.21. Right sliding cylinder ear shaft positioning block. DETAILED DESCRIPTION

[0035] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0036] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0037] like Figure 1 and Figure 2 As shown, an automatic hemming mechanism for a body sheet metal includes a bottom mold sliding bracket 1, an upper hemming arm 2, a lower hemming arm 3 and a fixed base 4;

[0038] After the vehicle panel is moved or transferred to the specified precise position by the equipment of the production line, the bottom mold sliding bracket is pushed to the working position by the cylinder of the fixed base, and the upper hemming arm and the lower hemming arm are buckled to press the panel;

[0039] The upper hemming arm is connected to the bottom mold sliding bracket through a pin shaft, and is connected to the lower hemming arm through a hinge with the pin shaft as a fulcrum, and extends out to press the plate under the action of the main hydraulic cylinder;

[0040] The lower hemming arm is provided with a pre-hemming knife 3.1, which is pre-pressed and then cooperates with the upper hemming arm;

[0041] The fixed base is provided with a slide rail (4.3, left slide rail; 4.4, right slide rail), and the bottom mold sliding bracket is slidably matched with the slide rail.

[0042] The working principle of the hemming machine is to first push the two hemming knives and the bottom die to the designated working position through the slide cylinder, and then drive the main arm of the final hemming knife through the hydraulic cylinder. The main arm hinge drives the pre-hemming knife to fold the plate at an acute angle first, and the final hemming knife presses down and finally presses the plate to achieve the hemming effect. The specific action sequence is as follows, and the white arrow is the movement trend of the blade.

[0043] Specifically, the bottom mold sliding bracket includes a bottom mold 1.1, a first lower arm hinge pin 1.2, a sliding frame 1.3, an upper arm hinge pin bushing assembly 1.6, an upper hanging point bearing joint 1.7, a hydraulic cylinder 1.8, a main cylinder ear shaft left positioning block 1.9, a main cylinder ear shaft right positioning block 1.10, sliders 1.15-1.18 and a telescopic cylinder upper hanging point positioning block 1.19; the bottom mold is fixed to the front end of the sliding frame, the first lower arm hinge pin is installed between the two side arms of the sliding frame, and the upper arm The arm hinge pin bushing assembly is installed between the two side arms of the sliding frame, the two sides of the hydraulic cylinder are installed on the left positioning block of the main cylinder ear shaft and the right positioning block of the main cylinder ear shaft through the hinge shaft, the left positioning block of the main cylinder ear shaft and the right positioning block of the main cylinder ear shaft are respectively fixed on the two side arms of the sliding frame, the upper hanging point bearing joint is installed on the piston rod of the hydraulic cylinder, the slider is fixed on the two sides of the bottom of the sliding frame, and the upper hanging point positioning block of the telescopic cylinder is fixed in the middle position of the bottom of the sliding frame. The lower buckle flat limit block and the lower buckle concave limit block are fixed on both sides of the upper part of the sliding frame. The left in-place limit bracket 1.20 and the right in-place limit bracket 1.21 are fixed at the front position of the bottom of the sliding frame, and the left in-place limit bracket and the right in-place limit bracket are respectively fixed with in-place limit blocks 1.22-1.25.

[0044] Specifically, the upper hemming arm comprises a final hemming knife 2.1, an upper hemming arm main arm 2.2, an upper hemming arm hinge pin 2.3, an upper hanging point pin 2.4 and a second lower hemming arm hinge pin 2.5, the final hemming knife is fixed to the front end of the upper hemming arm main arm, the middle part of the upper hemming arm main arm is connected to the upper hemming arm hinge pin bushing assembly through the upper hemming arm hinge pin, the tail of the upper hemming arm main arm is connected to the upper hanging point bearing joint through the upper hanging point pin, and the second lower hemming arm hinge pin is installed at the lower part of the upper hemming arm main arm. Upper buckle-fit flat limit blocks 2.6 and upper buckle-fit convex limit blocks 2.7 are fixed on both sides of the upper hemming arm main arm, and the upper buckle-fit flat limit blocks and upper buckle-fit convex limit blocks are respectively in contact with the corresponding lower buckle-fit flat limit blocks 1.4 and lower buckle-fit concave limit blocks 1.5.

[0045] Specifically, the lower edge wrapping arm includes a pre-wrapping knife 3.1, a lower edge wrapping arm main arm 3.2, a lower edge wrapping arm connecting rod 3.3 and a third lower edge wrapping arm hinge pin 3.4, the pre-wrapping knife is fixed at the front end of the lower edge wrapping arm main arm, the middle part of the lower edge wrapping arm main arm is hinged to one end of the lower edge wrapping arm connecting rod through the third lower edge wrapping arm hinge pin, the other end of the lower edge wrapping arm connecting rod is connected to the second lower edge wrapping arm hinge pin through a bushing assembly, and the lower end of the lower edge wrapping arm main arm is connected to the first lower edge wrapping arm hinge pin through a bushing assembly.

[0046] Specifically, the sliding base includes a base bottom plate 4.1, a base slide 4.2, a left slide rail 4.3, a right slide rail 4.4, an in-place clamping cylinder and a slide pushing cylinder 4.19, the base slide is fixed on the base bottom plate, the left slide rail and the right slide rail are respectively fixed on the base slide, the two sides of the slide pushing cylinder are installed on the base bottom plate through sliding cylinder ear shaft positioning blocks (left sliding cylinder ear shaft positioning block 4.20, right sliding cylinder ear shaft positioning block 4.21), the piston rod of the slide pushing cylinder is connected to the bottom of the sliding frame, the in-place clamping cylinder is fixed to the side of the base slide, and the in-place clamping blocks (left in-place clamping block 4.15, right in-place clamping block 4.18) are installed on the piston of the in-place clamping cylinder, and the in-place clamping blocks cooperate with the sliding frame clamping limit blocks located on the side of the sliding frame.

[0047] Specifically, a sliding frame retraction limit block is fixed to the side of the sliding frame, and the sliding frame retraction limit block cooperates with a retraction limit block (right retraction limit block 4.11; left retraction limit block 4.12) fixed on a retraction support (left retraction support 4.5; right retraction support 4.6), and the retraction support is fixed on the bottom plate of the base. The pre-packaging knife is located between the final packaging knife and the bottom mold.

[0048] like Figure 7-9As shown, the following is the overall working process of the hemming machine. The hemming machine is in a fully open and retracted state and waits for the plate to move to the preset hemming position. After the plate reaches the preset position, the slide cylinder 4.19 pushes the sliding frame 1.3 to the working position of the hemming machine. The in-place limit blocks 1.22-1.25 press against the extended in-place limit blocks 4.9-4.10 and then the in-place clamping block 4.15 presses the sliding frame 1.3 under the drive of the in-place clamping cylinder 4.14. At this time, the hemming machine is in place. Under the extension and clamping of the hydraulic cylinder 1.8, the lower hemming arm hinge 3.3 first drives the lower hemming arm main arm 3.2 to be installed. The pre-wrapping knife 3.1 first folds the plate upwards to deform and fold it into an acute angle. Then the upper wrapping arm main arm 2.2 drives the final wrapping knife 2.1 to continue to press the plate downward and maintain the wrapping state for 15 seconds until the wrapping is completed. Then the hydraulic cylinder 1.8 retracts the upper wrapping arm main arm 2.2 to drive the final wrapping knife 2.1 to leave the plate first. The pre-wrapping knife 3.1 then leaves the plate. After the hydraulic cylinder retracts into place, the slide cylinder 4.19 begins to retract the sliding frame 1.14 installed on the sliding frame 1.3 and retracts the limit block 4.12, and the contact returns to the initial position. The plate leaves and the wrapping process is completed.

[0049] It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An automatic hemming mechanism for a car body sheet metal, characterized in that: It includes a bottom mold sliding bracket, an upper hemming arm, a lower hemming arm and a fixed base; After the vehicle panel is moved or transferred to the specified precise position by the equipment of the production line, the bottom mold sliding bracket is pushed to the working position by the cylinder of the fixed base, and the upper hemming arm and the lower hemming arm are buckled to press the panel; The upper hemming arm is connected to the bottom mold sliding bracket through a pin shaft, and is connected to the lower hemming arm through a hinge with the pin shaft as a fulcrum, and extends out to press the plate under the action of the main hydraulic cylinder; The lower hemming arm is provided with a pre-hemming knife, which is pre-pressed first and then cooperates with the upper hemming arm; The fixed base is provided with a slide rail, and the bottom mold sliding bracket is slidably matched with the slide rail.

2. The automatic hemming mechanism for body sheet metal according to claim 1, characterized in that: The bottom mold sliding bracket includes a bottom mold, a first lower arm hinge pin, a sliding frame, an upper arm hinge pin bushing assembly, an upper hanging point bearing joint, a hydraulic cylinder, a main cylinder ear shaft left positioning block, a main cylinder ear shaft right positioning block, a sliding block and a telescopic cylinder upper hanging point positioning block; the bottom mold is fixed to the front end of the sliding frame, the first lower arm hinge pin is installed between the two side arms of the sliding frame, the upper arm hinge pin bushing assembly is installed between the two side arms of the sliding frame, the two sides of the hydraulic cylinder are installed on the main cylinder ear shaft left positioning block and the main cylinder ear shaft right positioning block through the hinge shaft, the main cylinder ear shaft left positioning block and the main cylinder ear shaft right positioning block are respectively fixed on the two side arms of the sliding frame, the upper hanging point bearing joint is installed on the piston rod of the hydraulic cylinder, the sliding block is fixed on both sides of the bottom of the sliding frame, and the telescopic cylinder upper hanging point positioning block is fixed in the middle position of the bottom of the sliding frame.

3. The automatic hemming mechanism for body sheet metal according to claim 2, characterized in that: A lower buckling flat limit block and a lower buckling concave limit block are respectively fixed on both sides of the upper part of the sliding frame.

4. The automatic hemming mechanism for body sheet metal according to claim 2, characterized in that: A left in-place limiting bracket and a right in-place limiting bracket are respectively fixed to the front position of the bottom of the sliding frame, and an in-place limiting block is respectively fixed to the left in-place limiting bracket and the right in-place limiting bracket.

5. The automatic hemming mechanism for body sheet metal according to claim 3, characterized in that: The upper hemming arm includes a final hemming knife, an upper hemming arm main arm, an upper hemming arm hinge pin, an upper hanging point pin and a second lower hemming arm hinge pin. The final hemming knife is fixed to the front end of the upper hemming arm main arm, the middle part of the upper hemming arm main arm is connected to the upper hemming arm hinge pin bushing assembly through the upper hemming arm hinge pin, the tail part of the upper hemming arm main arm is connected to the upper hanging point bearing joint through the upper hanging point pin, and the second lower hemming arm hinge pin is installed at the lower part of the upper hemming arm main arm.

6. The automatic hemming mechanism for body sheet metal according to claim 5, characterized in that: An upper buckling flat limit block and an upper buckling convex limit block are respectively fixed on both sides of the upper bag arm main arm, and the upper buckling flat limit block and the upper buckling convex limit block are respectively in contact with the corresponding lower buckling flat limit block and the lower buckling concave limit block.

7. The automatic hemming mechanism for body sheet metal according to claim 5, characterized in that: The lower edge wrapping arm includes a pre-wrapping knife, a lower edge wrapping arm main arm, a lower edge wrapping arm connecting rod and a third lower edge wrapping arm hinge pin. The pre-wrapping knife is fixed to the front end of the lower edge wrapping arm main arm, the middle part of the lower edge wrapping arm main arm is hinged to one end of the lower edge wrapping arm connecting rod through the third lower edge wrapping arm hinge pin, the other end of the lower edge wrapping arm connecting rod is connected to the second lower edge wrapping arm hinge pin through a bushing assembly, and the lower end of the lower edge wrapping arm main arm is connected to the first lower edge wrapping arm hinge pin through a bushing assembly.

8. The automatic hemming mechanism for body sheet metal according to claim 7, characterized in that: The sliding base includes a base bottom plate, a base slide, a left slide rail, a right slide rail, an in-place clamping cylinder and a slide pushing cylinder. The machine base slide is fixed on the base bottom plate, the left slide rail and the right slide rail are respectively fixed on the base slide, both sides of the slide pushing cylinder are installed on the base bottom plate through sliding cylinder ear shaft positioning blocks, the piston rod of the slide pushing cylinder is connected to the bottom of the sliding frame, the in-place clamping cylinder is fixed to the side of the base slide, and a in-place clamping block is installed on the piston of the in-place clamping cylinder, and the in-place clamping block cooperates with the sliding frame clamping limit block located on the side of the sliding frame.

9. The automatic hemming mechanism for body sheet metal according to claim 8, characterized in that: A sliding frame retraction limit block is fixed to the side of the sliding frame, and the sliding frame retraction limit block cooperates with a retraction limit block fixed on a retraction support, and the retraction support is fixed on the base bottom plate.

10. The automatic hemming mechanism for body sheet metal according to claim 8, characterized in that: The pre-packaging knife is located between the final packing knife and the bottom mold.

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