Pre-hemming tooling and pre-hemming method

Abstract

The present invention provides a pre-rolling tool and a pre-rolling method. The pre-rolling tool of the present invention includes a base, and a clamping wheel and a rolling wheel arranged on the base. The clamping wheel can be guided and movably arranged on the base, and an elastic telescopic member is arranged between the clamping wheel and the base, and a transmission mechanism is arranged between the clamping wheel and the rolling wheel; when the base approaches the workpiece to be pre-rolled, the clamping wheel can first abut against the inner plate of the workpiece, and stay at the position of clamping the workpiece as the base continues to approach, and the rolling wheel is driven to move through the transmission mechanism due to the movement relative to the base, so as to perform a pressing action on the edge of the outer plate of the workpiece. The pre-rolling tool of the present invention, by linking the clamping wheel and the rolling wheel on the base, drives the rolling wheel to perform a pressing action by the clamping wheel with the help of the movement of the clamping wheel relative to the base in the process of clamping the workpiece, which can effectively improve the efficiency of the pre-rolling process and reduce the difficulty and number of the configuration of the driving mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile manufacturing, and particularly relates to a pre-edge rolling tooling. In addition, the present invention also relates to a pre-edge rolling method. Background Art

[0002] With the development of the automobile manufacturing industry, the diversified and individualized requirements for the appearance of automobiles have gradually increased. In particular, the styling updates of automobile door covers are becoming more frequent and more individualized. As a result, the edge wrapping styling of the door covers is frequently used, and large-range and large-angle wrapping structures often appear on the door covers. For the edge parts of the door covers that need to be rolled and bent, the rolling and bending angles and dimensions also need to be adjusted frequently. Therefore, it is necessary to design special workpiece pressing mechanisms and edge rolling tools corresponding to the structural characteristics of specific workpieces.

[0003] However, for these parts with different characteristics and their specific shapes and wrapping structures, it is difficult to implement the process of developing special pressing and edge rolling tools. There are many problems in the development of edge rolling equipment, such as long cycle time, high cost, long production beat, and difficulty in optimizing edge rolling quality.

[0004] For workpieces to be processed with large-angle wrapping at the edges such as door covers, their edges generally need to go through multiple edge rolling processes to gradually bend the angles of their edges, and finally complete the wrapping process. Therefore, one or more pre-edge rolling processes are set before the final rolling and forming process. In order to reliably fix the workpiece to be pre-edge rolled on the die, a pressing wheel is generally set, and at the same time, an edge rolling wheel for bending the edge of the workpiece is set. Since the movement paths of the two rolling wheels are different, two sets of driving mechanisms need to be set separately to drive them to perform pressing and bending actions respectively.

[0005] The existing above design not only requires multiple robots to drive the pressing wheel and the edge rolling wheel respectively, but also needs to design different driving travel paths for each robot. As a result, the structure of the entire pre-edge rolling equipment is complex, the design and manufacturing costs are high, and the replacement and debugging operations of the pressing wheel and the edge rolling wheel in different processes are large, seriously affecting the production efficiency. Summary of the Invention

[0006] In view of this, the present invention aims to propose a pre-edge rolling tooling to provide a design idea for a pre-edge rolling tooling with high structural integration, which is beneficial to reducing the difficulty and quantity of the equipped driving mechanisms.

[0007] To achieve the above object, the technical solution of the present invention is realized as follows:

[0008] A pre-edge rolling tooling includes a base, and a pressing wheel and an edge rolling wheel arranged on the base;

[0009] The pressing wheel is movably disposed on the base in a guiding manner, and an elastic telescopic member is provided between the pressing wheel and the base, and a transmission mechanism is provided between the pressing wheel and the hemming wheel;

[0010] When the base approaches the workpiece to be pre-hemming processed, the pressing wheel can first abut against the inner plate of the workpiece, and stay at the position of pressing the workpiece due to the shortening of the elastic telescopic member during the continuous approach of the base; and, due to the movement relative to the base, the pressing wheel can drive the hemming wheel to move through the transmission mechanism, so as to make a pressing action on the edge of the outer plate of the workpiece, and bend the edge toward the inner plate side by a preset angle.

[0011] Further, the base includes a lower base and an upper base which are arranged at intervals up and down, a guiding column is provided between the lower base and the upper base, a moving frame is slidably arranged on the guiding column, the pressing wheel is arranged on the moving frame, and the elastic telescopic member is arranged between the moving frame and the upper base.

[0012] Further, the elastic telescopic member is a compression spring sleeved on the guiding column.

[0013] Further, a swing rod is hinged on the lower base, the hemming wheel is arranged on the swing rod, the transmission mechanism is arranged between the moving frame and the swing rod, and the swing rod can swing along with the sliding of the moving frame on the guiding column to drive the hemming wheel to make the pressing action.

[0014] Further, the transmission mechanism includes a connecting rod whose two ends are respectively hinged to the swing rod and the moving frame.

[0015] Further, a limiting frame is arranged on the base, the limiting frame defines the extreme positions of the sliding of the moving frame on the guiding column, and when the moving frame slides to the extreme position, the hemming wheel bends the edge to the position of the preset angle.

[0016] Further, when the moving frame slides to the extreme position, the connecting rod is perpendicular to the guiding column.

[0017] Further, the pre-hemming tooling further includes a monitoring unit for monitoring the pressing action, and the monitoring unit can send a signal to the outside when the hemming wheel bends the edge to the position of the preset angle.

[0018] Further, the monitoring unit includes an alarm and a detection switch which are electrically connected, and the detection switch can act due to the movement of the pressing wheel or the hemming wheel in place on the base, and control the alarm to give an alarm.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] The pre-rolling tool of the present invention is provided with a clamping wheel and a rolling wheel on the base in a linked manner. With the help of the movement of the clamping wheel relative to the base in the process of clamping the workpiece, the clamping wheel drives the rolling wheel to perform a pressing action, so that only one driving mechanism can be configured for the pre-rolling tool. The driving mechanism drives the pre-rolling tool to perform a clamping action on the workpiece and completes the bending of the edge of the workpiece at a preset angle, so as to perform the subsequent pre-rolling tooling process along the edge direction of the workpiece. This design is ingenious and efficient, and provides a design idea for a pre-rolling tool with high structural integration, which can effectively improve the efficiency of the pre-rolling process and reduce the difficulty and number of configurations of the driving mechanism.

[0021] In addition, the base is designed to be a lower base and an upper base spaced apart from each other, and a guide column is arranged between the two, so that the movable frame of the pressure wheel can be guided and slid up and down on the guide column, which is beneficial to the smooth displacement of the pressure wheel on the base and helps to simplify the travel route of the base approaching the workpiece. By driving the pre-rolling tooling to move along the length direction of the guide column through the driving mechanism to make the base approach the workpiece, the pressure wheel can be smoothly pressed against the inner plate.

[0022] Another object of the present invention is to provide a pre-rolling method, wherein the pre-rolling tool comprises:

[0023] Installing the pre-rolling tool of the present invention on a driving mechanism;

[0024] The driving mechanism is provided with a first driving path for driving the pre-rolling tool to approach the workpiece and press the workpiece against the fetal membrane, and a second driving path for driving the pre-rolling tool to move along the edge of the workpiece; and,

[0025] The first driving path includes an abutment section and a pressing section which are connected in sequence. The pressing wheel abuts against the inner plate when the driving mechanism reaches the end of the abutment section, and stays at a position to press the workpiece during the driving mechanism moving in the pressing section. Due to the movement relative to the base, the pressing wheel drives the hemming wheel to perform the abutment action.

[0026] On the second driving path, the pre-rolling tool completes the pre-rolling process on the workpiece.

[0027] The pre - hemming method of the present invention can complete the pre - hemming process of a workpiece by setting two paths, namely the first driving path and the second driving path, and using a driving mechanism equipped with a pre - hemming tooling. On the first driving path, the pressing wheel can press the inner panel, and the hemming wheel can bend the edge to a preset angle. Then, on the entire second driving path, the pre - hemming tooling can roll the entire edge of the workpiece to the position with the required preset angle, efficiently completing the pre - hemming operation of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof are for explaining the present invention. The front - back, up - down and other orientation terms involved only represent relative positional relationships and do not constitute improper limitations to the present invention. In the drawings:

[0029] Figure 1 FIG. 9 is a schematic diagram of the overall structure of the pre - hemming tooling according to Embodiment 1 of the present invention in the initial state;

[0030] Figure 2 FIG. 13 is a schematic diagram of the overall structure of the pre - hemming tooling according to Embodiment 1 of the present invention in the state where the pressing wheel gradually presses the inner panel;

[0031] Figure 3 FIG. 17 is a schematic diagram of the overall structure of the pre - hemming tooling according to Embodiment 1 of the present invention in the state where the moving frame reaches the extreme position;

[0032] Figure 4 FIG. 21 is a schematic diagram of the operation principle of the pre - hemming tooling according to Embodiment 1 of the present invention in the initial state;

[0033] Figure 5 FIG. 25 is a schematic diagram of the operation principle of the pre - hemming tooling according to Embodiment 1 of the present invention in the state where the moving frame reaches the extreme position;

[0034] Figure 6 FIG. 29 is a schematic sectional structure diagram of the workpiece according to Embodiment 1 of the present invention placed on the die;

[0035] DESCRIPTION OF THE REFERENCE NUMERALS:

[0036] 1, workpiece; 10, inner panel; 11, outer panel; 110, edge;

[0037] 20, tool arm; 200, connecting flange;

[0038] 30, base; 300, lower base; 301, upper base; 310, clamping wheel; 311, moving frame; 3110, top block; 312, guide column; 313, compression spring; 320, hemming wheel; 321, swing rod; 322, connecting rod; 323, first hinge axis; 324, second hinge axis; 325, third hinge axis; 330, alarm; 331, detection switch; 332, limit frame;

[0039] 4. Fetal membrane. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0041] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inner" and "back" appear, they are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; if terms such as "first" and "second" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0042] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installed", "connected", "connection", and "connector" should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0043] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0044] Embodiment 1

[0045] This embodiment relates to a pre-rolling tool, thereby providing a design concept for a pre-rolling tool with high structural integration, which is conducive to reducing the difficulty and number of configurations of the drive mechanism; an exemplary structure thereof is as follows Figure 1 , Figure 2 and Figure 3 shown.

[0046] Overall, the pre-hem tooling includes a base 30, a pressing wheel 310 and a hemming wheel 320 which are both movably arranged on the base 30. Among them, the pressing wheel 310 is movably arranged on the base 30 in a guiding manner, and an elastic telescopic member is provided between the pressing wheel 310 and the base 30, and a transmission mechanism is provided between the pressing wheel 310 and the hemming wheel 320. When the base 30 approaches the workpiece 1 to be pre-hemmed, the pressing wheel 310 can first abut against the inner plate 10 of the workpiece 1, and stay at the position of pressing the workpiece 1 due to the shortening of the elastic telescopic member during the continuous approach of the base 30; moreover, due to the movement relative to the base 30, the pressing wheel 310 can drive the hemming wheel 320 to move through the transmission mechanism, so as to make a pressing action on the edge 110 of the outer plate 11 of the workpiece 1, and bend the edge 110 toward the inner plate 10 by a preset angle.

[0047] Specifically, the base 30 of this embodiment includes a lower base 300 and an upper base 301 which are arranged at intervals up and down. And, a guiding column 312 is provided between the lower base 300 and the upper base 301. A moving frame 311 is slidably arranged on the guiding column 312, and the pressing wheel 310 is arranged on the moving frame 311, and the elastic telescopic member is arranged between the moving frame 311 and the upper base 301. Preferably, the guiding column 312 is vertically arranged, and the bottom of the moving frame 311 bypasses the lower base 300 and is located below the lower base 300; the above-mentioned pressing wheel 310 is fixedly installed on the bottom of the moving frame 311 through a roller frame. Of course, the pressing wheel 310 can be rotatably arranged on the roller frame so that the pressing wheel 310 rolls on the inner plate 10 during the process of the pre-hem tooling moving along the edge of the workpiece 1.

[0048] The base 30 is designed as the lower base 300 and the upper base 301 which are arranged at intervals up and down. By arranging the guiding column 312 between the two, the moving frame 311 of the pressing wheel 310 can slide up and down in a guiding manner on the guiding column 312, which is beneficial to the smooth displacement of the pressing wheel 310 on the base 30, and helps to simplify the traveling route of the base 30 approaching the workpiece 1. By driving the pre-hem tooling to move along the length direction of the guiding column 312 to make the base 30 approach the workpiece 1, the pressing wheel 310 can be smoothly pressed against the inner plate 10.

[0049] The elastic telescopic member is provided to be able to be shortened under the extrusion of the moving frame 311 during the process of the base 30 continuing to approach the workpiece 1 after the pressing wheel 310 abuts against the inner plate 10, so as to allow the moving frame 311 to slide up on the guiding column 312, so that the pressing wheel 310 stays at the position of pressing the workpiece 1. And, as the elastic telescopic member is squeezed and shortened, the force applied by the elastic telescopic member to the moving frame 311 will gradually increase, and then be transmitted to the pressing wheel 310, and the pressing force of the pressing wheel 310 on the inner plate 10 can be gradually increased.

[0050] Based on the above functional requirements, the elastic telescopic member can be a compression cylinder, a rubber pad, etc. Preferably, the elastic telescopic member in this embodiment is a compression spring 313 sleeved on the guide post 312, and both ends of the compression spring 313 abut against the upper base 301 and the moving frame 311 respectively. Using the compression spring 313 as the elastic telescopic member is convenient for configuration; moreover, after the pressing wheel 310 presses against the inner plate 10, as the base 30 continues to approach the workpiece 1, the compression spring 313 can be compressed as the moving frame 311 moves upward on the guide post 312, so that the elastic force transmitted to the pressing wheel 310 gradually increases, enabling the pressing wheel 310 to apply an increasingly large pressing force to the workpiece 1, which not only meets the displacement requirements of the moving frame 311, but also ensures that the workpiece 1 is stably positioned on the die 4.

[0051] For the setting structure of the hemming wheel 320 on the base 30, there are various options. In this embodiment, a swing rod 321 is hinged on the lower base 300, the hemming wheel 320 is arranged on the swing rod 321, and the transmission mechanism is arranged between the moving frame 311 and the swing rod 321. The swing rod 321 can swing as the moving frame 311 slides on the guide post 312 to drive the hemming wheel 320 to make a pressing action. By arranging the hemming wheel 320 on the swing rod 321, the up and down movement of the moving frame 311 can be transformed into the driving of the swing of the swing rod 321 by reasonably setting the transmission mechanism. Moreover, according to the pressing direction requirement of the bent edge 110, by hinging the swing rod 321 at a reasonable position on the lower base 300, the hemming wheel 320 can press and bend the edge 110. The overall structure design is simple and efficient, and has good structural stability.

[0052] Based on the setting of the swing rod 321, the transmission mechanism of this embodiment includes a connecting rod 322 whose two ends are respectively hinged to the swing rod 321 and the moving frame 311. Among them, the middle of the swing rod 321 is hinged to the lower base 300 through a first hinge shaft 323, one end of the connecting rod 322 is hinged to the top of the swing rod 321 through a second hinge shaft 324, and the other end of the connecting rod 322 is hinged to one side of the moving frame 311 through a third hinge shaft 325. The hemming wheel 320 is fixedly installed on the bottom of the swing rod 321 through a roller frame. Of course, like the pressing wheel 310, the hemming wheel 320 is also rotatably arranged on the roller frame so that during the process of the pre-hemming tooling advancing along the edge of the workpiece 1, the hemming wheel 320 rolls on the edge 110 of the outer plate 11 and completes the rolling of the edge 110.

[0053] The transmission mechanism is designed in the form of the connecting rod 322. The connecting rod 322 can change its attitude angle as the moving frame 311 moves, and then form a push and pull on the swing rod 321 to drive the swing rod 321 to swing. The rotation path of the force is simple, the number of transmission components is small, and it has the characteristics of high transmission efficiency.

[0054] In addition, as Figure 3As shown, a limiting frame 332 is provided on the base 30. Specifically, the connecting rod 322 is arranged on the upper base 301, and a top block 3110 opposite to the connecting rod 322 can be additionally installed on the top of the moving frame 311. When the moving frame 311 slides upward on the guiding column 312 until the top block 3110 abuts against the limiting frame 332, the moving frame 311 moves upward to the extreme position. It can be seen that the limiting frame 332 defines the extreme position of the moving frame 311 sliding on the guiding column 312; at the same time, this extreme position should correspond to the position where the hemming wheel 320 presses the edge portion 110 in place, that is, when the moving frame 311 slides to the extreme position, the hemming wheel 320 just bends the edge portion 110 to the position of the preset angle.

[0055] By providing the limiting frame 332 on the base 30, the extreme position of the upward movement of the moving frame 311 can be defined, and the position of the limiting frame 332 is preferably designed to be adjustable. Then, the extreme position of the moving frame 311 can be adjusted correspondingly according to the size requirement of the preset angle, which can well control the bending angle of the edge portion 110 (i.e., the rolling change angle of pre-hemming), and is beneficial to ensuring the consistency and stability of the rolling and bending angle.

[0056] Based on the above settings, a connecting rod 322 with a suitable length is preferably designed, and its hinged position is reasonably arranged; so that when the moving frame 311 slides to the extreme position, the connecting rod 322 is perpendicular to the guiding column 312. By reasonably designing the length of the connecting rod 322 and its hinged positions on the moving frame 311 and the swing rod 321, when the moving frame 311 reaches the extreme position, the connecting rod 322 is perpendicular to the guiding column 312, and a mechanical self-locking of the transmission mechanism can be formed in this position state, that is, the force exerted by the connecting rod 322 on the moving frame 311 is basically all transmitted to the guiding column 312, and will not be decomposed in the length direction of the guiding column 312, thus avoiding the influence of the force transmission of the transmission mechanism on the pressing force of the pressing wheel 310 on the workpiece 1.

[0057] In addition, a monitoring unit for monitoring the pressing action is also provided in the pre-hemming tooling of this embodiment, and the monitoring unit can send a signal to the outside when the hemming wheel 320 bends the edge portion 110 to the position of the preset angle. By setting the monitoring unit on the pre-hemming tooling, it can timely reflect the situation that the moving frame 311 reaches the extreme position or the pressing action of the hemming wheel 320 on the edge portion 110 is in place, so as to control the pre-hemming tooling to move along the edge of the workpiece 1 subsequently to complete the pre-hemming processing operation of the workpiece 1.

[0058] Specifically, the monitoring unit includes an alarm 330 and a detection switch 331 connected by a circuit. The detection switch 331 can be actuated when the pressing wheel 310 or the hemming wheel 320 moves into place on the base 30, and controls the alarm 330 to give an alarm. For example, the alarm 330 can be a common audible and visual alarm, and the detection switch 331 can be a travel switch. During installation, the detection switch 331 can be installed on the limit bracket 332, and when the top block 3110 reaches the position where it abuts against the limit bracket 332 (i.e., the moving frame 311 reaches the extreme position), the detection switch 331 can be triggered to actuate.

[0059] By setting the detection switch 331, a signal can be sent in time when the moving frame 311 reaches the extreme position or the hemming wheel 320's bending and pressing action on the edge 110 is in place. The setting of the alarm 330 facilitates the on-site operator to timely understand the operating state of the equipment. After the detection switch 331 is triggered to actuate, the audible and visual alarm will be powered on, the light of the audible and visual alarm will flash, and the buzzer will sound, indicating that the pre-hemming tooling is in an ideal state and position and pre-hemming work can begin.

[0060] In the actual application of the pre-hemming tooling, the driving mechanism can be a robot. The pre-hemming tooling is installed on the tool arm 20 of the robot, and the tool arm 20 is installed on the robot through the connecting flange 200 at its top. The robot drives the whole pre-hemming tooling to shift and perform movements on two driving paths. Among them, the first driving path is the process of driving the pre-hemming tooling to approach the workpiece 1 and pressing the workpiece 1 against the die bed 4, and the second driving path is the process of driving the pre-hemming tooling to travel along the edge of the workpiece 1 to perform pre-hemming treatment on the workpiece 1.

[0061] In the pre-hemming tooling of this embodiment, the linkage setting of the pressing wheel 310 and the hemming wheel 320 mainly plays a role during the process of the pre-hemming tooling moving on the first driving path. Specifically, the first driving path can be divided into two stages: the abutting stage and the pressing stage. When the pre-hemming tooling travels to the end of the abutting stage under the drive of the driving mechanism, as Figure 1 shown, the pressing wheel 310 abuts against the inner panel 10.

[0062] After that, the driving mechanism continues to drive the pre-hemming tooling to travel to the pressing stage. During the pressing stage, as Figure 2 and combined with Figure 4 shown, the moving frame 311 compresses the compression spring 313 and moves upward relative to the base 30 (along the direction shown by a' in Figure 4 ), drives the connecting rod 322 to swing upward, so that the connecting rod 322 pushes the swing rod 321 in the direction shown by b' in Figure 4 , thereby causing the hemming wheel 320 to have a Figure 2 or Figure 4At the same time, since the pre-rolling tooling is moving downward as a whole, the rolling wheel 320 is still moving. Figure 2 or Figure 4 Movement in the direction shown by a.

[0063] When the moving frame 311 reaches the limit position, Figure 3 Combined with Figure 5 As shown, the hemming wheel 320 moves down to the right side of the edge 110 and presses the edge 110 in the direction of the edge 110, thereby completing the pressing action on the edge 110. At this moment, the connecting rod 322 is perpendicular to the guide column 312, realizing the mechanical self-locking of the transmission mechanism.

[0064] In summary, the pre-rolling tool of this embodiment is provided with a pressing wheel 310 and a rolling wheel 320 on the base 30 in a linked manner. With the help of the movement of the pressing wheel 310 relative to the base 30 during the process of pressing the workpiece 1, the pressing wheel 310 drives the rolling wheel 320 to perform a pressing action, so that only one driving mechanism can be configured for the pre-rolling tool, and the driving mechanism drives the pre-rolling tool to press the workpiece 1 while completing the edge 110 of the workpiece 1. Figure 6 The preset angle of bend shown in e is to facilitate the subsequent pre-rolling process of the pre-rolling tool along the edge direction of the workpiece 1. This design is ingenious and efficient, providing a design idea for a pre-rolling tool with high structural integration, which can effectively improve the efficiency of the pre-rolling process and reduce the difficulty and number of drive mechanisms.

[0065] Embodiment 2

[0066] This embodiment relates to a pre-rolling method, wherein the pre-rolling tool first installs the pre-rolling tool provided in the first embodiment on a driving mechanism, and sets two driving paths for the driving mechanism. The two driving paths are respectively a first driving path for driving the pre-rolling tool to approach the workpiece 1 and press the workpiece 1 against the tire membrane 4, and a second driving path for driving the pre-rolling tool to move along the edge of the workpiece 1.

[0067] The first driving path includes a contact section and a pressing section which are connected in sequence. The pressing wheel 310 contacts the inner plate 10 when the driving mechanism reaches the end of the contact section, and stays at the position of pressing the workpiece 1 during the driving mechanism's movement in the pressing section. Moreover, due to the stop, the pressing wheel 310 moves relative to the base 30, and then uses the movement of the pressing wheel 310 to drive the hemming wheel 320 to perform a pressing action.

[0068] After the hemming wheel 320 completes the pressing action, the edge portion 110 is bent to a position of a preset angle; thereafter, the driving mechanism drives the pre-hemming tooling to move on the second driving path, thereby completing the pre-hemming process on the workpiece 1.

[0069] The pre-hemming method of this embodiment is suitable for preprocessing the edges of workpieces such as automobile door covers before large-angle hemming by arranging the pre-hemming tooling of the first embodiment on a robot. By setting two paths, namely the first driving path and the second driving path, and using a driving mechanism equipped with the pre-hemming tooling, the pre-hemming process of workpiece 1 can be completed. On the first driving path, the pressing wheel 310 can complete the pressing of the inner panel 10, and the hemming wheel 320 can bend the edge 110 to a preset angle. Then, on the entire second driving path, the pre-hemming tooling can roll the entire edge 110 of workpiece 1 to the position of the required preset angle, efficiently completing the pre-hemming process of workpiece 1.

[0070] The foregoing are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pre - hemming tooling, characterized in that: It includes a base (30), a pressing wheel (310) and a hemming wheel (320) provided on the base (30); The pressing wheel (310) is movably arranged on the base (30) in a guiding manner, and an elastic telescopic member is provided between the pressing wheel (310) and the base (30), and a transmission mechanism is provided between the pressing wheel (310) and the hemming wheel (320); When the base (30) approaches the workpiece (1) to be pre - hemmed, the pressing wheel (310) can first abut against the inner plate (10) of the workpiece (1), and stay in the position of pressing the workpiece (1) due to the shortening of the elastic telescopic member during the continuous approach of the base (30); and, Due to the movement relative to the base (30), the pressing wheel (310) can drive the hemming wheel (320) to move through the transmission mechanism, so as to make a pressing action on the edge portion (110) of the outer plate (11) of the workpiece (1), and bend the edge portion (110) towards the inner plate (10) side by a preset angle; The base (30) includes a lower base (300) and an upper base (301) arranged at intervals up and down. A guiding column (312) is provided between the lower base (300) and the upper base (301). A moving frame (311) is slidably arranged on the guiding column (312). The pressing wheel (310) is arranged on the moving frame (311), and the elastic telescopic member is provided between the moving frame (311) and the upper base (301); A swing rod (321) is hinged on the lower base (300). The hemming wheel (320) is arranged on the swing rod (321). The transmission mechanism is provided between the moving frame (311) and the swing rod (321). The swing rod (321) can swing along with the sliding of the moving frame (311) on the guiding column (312) to drive the hemming wheel (320) to make the pressing action; The transmission mechanism includes a connecting rod (322) whose two ends are respectively hinged to the swing rod (321) and the moving frame (311).

2. The pre - hemming tooling according to claim 1, characterized in that: The elastic telescopic member is a compression spring (313) sleeved on the guiding column (312).

3. The pre - hemming tooling according to claim 1, characterized in that: A limiting frame (332) is provided on the base (30). The limiting frame (332) defines the extreme limit of the sliding of the moving frame (311) on the guiding column (312). When the moving frame (311) slides to the extreme limit, the hemming wheel (320) bends the edge portion (110) to the position of the preset angle.

4. The pre - hemming tooling according to claim 3, characterized in that: When the moving frame (311) slides to the extreme limit, the connecting rod (322) is perpendicular to the guiding column (312).

5. The pre - hemming tooling according to any one of claims 1 to 4, characterized in that: The pre-rolling tool further comprises a monitoring unit for monitoring the pressing action, wherein the monitoring unit is capable of sending a signal to the outside when the rolling wheel (320) bends the edge portion (110) to the position of the preset angle.

6. The pre-rolling tool according to claim 5, characterized in that: The monitoring unit comprises an electrically connected alarm (330) and a detection switch (331); the detection switch (331) can be activated when the pressing wheel (310) or the hemming wheel (320) moves into position on the base (30), thereby controlling the alarm (330) to issue an alarm.

7. A pre-seaming method, characterized in that, The pre-rolling tool comprises: Mounting the pre-rolling tool as claimed in any one of claims 1 to 6 on a driving mechanism; The driving mechanism is provided with a first driving path for driving the pre-rolling tool to approach the workpiece (1) and press the workpiece (1) onto the fetal membrane (4), and a second driving path for driving the pre-rolling tool to move along the edge of the workpiece (1); and, The first driving path comprises an abutment section and a pressing section which are connected in sequence; the pressing wheel (310) abuts against the inner plate (10) when the driving mechanism reaches the end of the abutment section, and stays at a position for pressing the workpiece (1) during the driving mechanism's movement in the pressing section; due to the movement relative to the base (30), the pressing wheel (310) drives the hemming wheel (320) to perform the pressing action; On the second driving path, the pre-rolling tool completes the pre-rolling process on the workpiece (1).

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