CN113714358B - A rolling folding device for opening a window of a sheet metal part and a folding method thereof - Google Patents
A rolling folding device for opening a window of a sheet metal part and a folding method thereof Download PDFInfo
- Publication number
- CN113714358B CN113714358B CN202110991964.7A CN202110991964A CN113714358B CN 113714358 B CN113714358 B CN 113714358B CN 202110991964 A CN202110991964 A CN 202110991964A CN 113714358 B CN113714358 B CN 113714358B
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- 239000002184 metal Substances 0.000 title claims abstract description 74
- 238000005096 rolling process Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000007246 mechanism Effects 0.000 claims abstract description 61
- 238000005452 bending Methods 0.000 claims abstract description 15
- 238000005520 cutting process Methods 0.000 claims abstract description 7
- 238000003825 pressing Methods 0.000 claims description 70
- 238000009957 hemming Methods 0.000 claims description 24
- 230000008569 process Effects 0.000 claims description 11
- 230000002457 bidirectional effect Effects 0.000 claims description 9
- 230000002787 reinforcement Effects 0.000 claims description 6
- 230000001154 acute effect Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 abstract description 5
- 238000007789 sealing Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 5
- 238000002788 crimping Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000008439 repair process Effects 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005493 welding type Methods 0.000 description 2
- 241000219495 Betulaceae Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D19/00—Flanging or other edge treatment, e.g. of tubes
- B21D19/02—Flanging or other edge treatment, e.g. of tubes by continuously-acting tools moving along the edge
- B21D19/04—Flanging or other edge treatment, e.g. of tubes by continuously-acting tools moving along the edge shaped as rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automobile Manufacture Line, Endless Track Vehicle, Trailer (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention provides a rolling and flanging device and a flanging method for a sheet metal part window, wherein the rolling and flanging device comprises a positioning mechanism, a multi-axis robot, a flanging wheel, a clamping driving piece and a clamping driving piece, wherein the positioning mechanism is used for clamping and positioning the sheet metal part, the window opening is formed in the sheet metal part, edges are formed after edges of the window opening are folded, the top corners of the edges are rounded corners, the positioning mechanism is provided with a portal frame, the multi-axis robot is fixed on the portal frame, a rolling and flanging mechanism is arranged on a mechanical arm of the multi-axis robot, the rolling and flanging mechanism comprises a retainer, a flanging wheel, a clamping driving piece and a flanging wheel, the flanging wheel is arranged on the retainer in a rolling mode, the end face of the flanging wheel is clung to the edges of the window opening and is in rolling friction with the edges, the clamping driving piece is provided with the clamping driving piece for rotating the clamping wheel assembly to be matched with the flanging wheel to clamp the edges, and the multi-axis robot drives the rolling and flanging mechanism to move along a window opening path to upwards bend the edges. The invention has the advantages of flat and smooth edge bending, no cutting and welding seams at the top corners of the edge, and good sealing property.
Description
Technical Field
The invention belongs to the technical field of metal processing equipment, and particularly relates to a rolling flanging device and a flanging method for a sheet metal part windowing.
Background
Some industrial sheet metal parts are provided with a window, for example, an air conditioner window arranged on a top cover of a passenger car, an air conditioner is installed in the window which is approximately rectangular, and edge folds of the window are needed before installation. Part of factories adopt a manual flanging method, flanging at the top angle of a window is difficult, regular fillet flanging cannot be realized manually, only right-angle slotting can be adopted for repair welding, the structure is shown in figure 1, typically, a seam cutting 2' is formed at the top angle of the window 1', then an edge is turned upwards, and a welding seam 2' is repaired at the end part of the adjacent edge, and the edge in the machining mode has weak tightness and may have rainwater leakage phenomenon; and the size is unstable, the uniformity is poor, and the appearance is poor. The manual flanging efficiency is low, and the average flanging speed of the skilled worker is about 10mm/s.
Furthermore, the prior art rolling hemming devices are generally implemented using a plurality of rollers, for example, the patent of publication No. CN107537942B discloses a rolling hemming device and a method for hemming an edge region of a sheet metal part, with a robot-guided rolling hemming head having a hemming roller which can be moved in a hemming direction along the edge region of the sheet metal part to be hemmed, and with a holding device for holding the sheet metal part in a defined position, by means of which a pressing force can be applied directly to the edge region of the sheet metal part, wherein the holding device has a first pressing roller arranged in front of the hemming roller in the hemming direction and a second pressing roller arranged behind the hemming roller in the hemming direction. The first pressing roller and the second pressing roller are fixedly installed, so that compatibility is low, and the first pressing roller and the second pressing roller are difficult to adapt to a narrow operation space. The contact area between the first pressing roller and the second pressing roller and the edge is smaller, and the planeness of the edge plane is affected. The patent also does not disclose how to fold the corners of a rectangular fenestration.
The patent application of the publication No. CN110328266A provides a flanging tool, a flanging assembly and a flanging method, wherein the flanging tool comprises a bracket and a flanging workpiece, the flanging workpiece comprises a bracket connecting rod and a rolling piece, one end of the bracket connecting rod is fixedly connected to the bracket, the rolling piece is rotationally connected to the other end of the bracket connecting rod and is used for contacting with a sheet metal part to roll and press the sheet metal part so as to fold the edge of the sheet metal part, the flanging assembly comprises a clamping assembly and a flanging tool, the clamping assembly is arranged on a machine tool, the bracket is rotatably connected to the machine tool in a mode capable of feeding or retreating and is configured to drive the rolling piece to roll and press or keep away from the sheet metal part clamped on the clamping assembly, the flanging method is applied to the flanging assembly, and the application at least can relieve the technical problems that the flanging work in the prior art is mainly manually folded by using tools such as bending pliers, the manual operation is inconvenient and the efficiency is low, and the folded edge is not regular. The workpiece to which the flanging tool is applicable is round, and the scheme of how to flanging at the vertex angle of the rectangular windowing structure of the application cannot be solved unlike the windowing structure of the application. The two groups of flanging workpieces of the flanging tool are also arranged in a relatively fixed mode, machining compatibility of products is low, a cylinder structure of linear motion of the flanging tool cannot be suitable for flanging in a narrow space, and the diameter of a roller is large and cannot be used for flanging with smaller fillets.
In addition, because the influence of the thickness of the steel plate on the edge folding completion degree is larger, the thicker steel plate is larger in cylinder stress at the round-off angle, the dead point of a common linear motion cylinder non-crank connecting rod mechanism is self-locked, the bending force is larger when the thick plate is folded, and the problem that the cylinder cannot be clamped can occur. Therefore, the above-mentioned edge rolling or hemming mechanism is generally applicable to a thin steel sheet of about 0.6mm, but cannot satisfy the rolling or hemming of a steel sheet having a thickness of 1mm or more.
Disclosure of Invention
The invention aims to provide a rolling flanging device and a flanging method for a sheet metal part window so as to solve the problems of difficult flanging at the vertex angle of a rectangular window, poor sealing performance, low efficiency, unstable size, difficult flanging of a thick plate and low flanging flatness.
The invention provides the following technical scheme:
A rolling hemming device for sheet metal part windowing, comprising:
The positioning mechanism is used for clamping and positioning the sheet metal part, a plurality of windows are arranged on the sheet metal part, edges appear after the windows are turned over, and the vertex angles of the edges are fillets;
The multi-axis robot is fixed on the portal frame, a mechanical arm of the multi-axis robot is provided with a rolling mechanism, and the multi-axis robot is used for moving and rotating the rolling mechanism;
The rolling and folding mechanism comprises a retainer, a flanging wheel, a pinch roller assembly and a clamping driving piece, wherein the retainer is fixed on the mechanical arm;
the edge folding wheel is arranged on the retainer in a rolling manner and is provided with a plane end face, and the end face is tightly clung to the edge of the window for rotation;
The clamping driving piece is fixedly arranged on the retainer, the pinch roller assembly is arranged at the output end of the clamping driving piece, and the clamping driving piece is used for rotating the pinch roller assembly to enable the pinch roller assembly to be matched with the flanging wheel so as to clamp the edges;
The multi-axis robot drives the rolling and folding mechanism to move along the path of the window opening and fold the edge upwards, the rolling and folding mechanism folds the edge for a plurality of times, and the folding angle is gradually increased.
Preferably, the tail end of the retainer is fixedly provided with a first rotating shaft, the flanging wheel comprises a mounting part and a crimping part which are arranged on the first rotating shaft, the mounting part is cylindrical, the crimping part is in a round table shape, an included angle between the end face of the crimping part and the side wall of the crimping part is an acute angle, and in the rolling process of the flanging wheel, the rim of the end face extrudes the sheet metal part to form a crimping line of an edge.
Preferably, the pinch roller assembly comprises a wheel seat, a second rotating shaft and a pinch roller, wherein the wheel seat is fixed on the clamping driving piece, the second rotating shaft is rotatably arranged on the wheel seat, an included angle is formed between the second rotating shaft and an extension line of the end face, the pinch roller is coaxially fixed on the second rotating shaft, the pinch roller is in a truncated cone shape with a wide upper part and a narrow lower part, a gap for accommodating an edge is formed between a wheel wall of the pinch roller and the end face, and the wheel wall of the pinch roller is parallel to the end face at the gap.
Preferably, the clamping driving member is a welding type clamping cylinder, the wheel seat is mounted on a pressing arm of the clamping driving member through a plurality of bolts, the clamping driving member rotates the wheel seat to enable the pressing wheel to press edges on the end face of the flanging wheel, and the clamping driving member comprises a stroke induction switch to induce whether the rotation stroke of the clamping driving member is in place or not.
Preferably, a gasket is installed between the pressing arm and the wheel seat so as to adjust a gap between the wheel wall of the pressing wheel and the end face.
Preferably, a first limiting block is mounted on the back of the pressing arm, a second limiting block is mounted on the retainer, and in the flanging process, the first limiting block abuts against the second limiting block to limit the rotation angle of the clamping driving piece.
Preferably, the fillet radius of the edge is more than or equal to 20mm, and the diameter of the end part of the pressing wheel is more than or equal to 12mm.
Further, the positioning mechanism comprises a fixed seat, a movable seat, an X-axis driving mechanism and a Y-axis driving mechanism, wherein an X-axis guide rail is arranged on the fixed seat, the X-axis driving mechanism can drive the movable seat to translate along the X-axis guide rail, the X-axis driving mechanism comprises a motor, a gear and a rack, the motor is fixed on the movable seat, the gear is fixed on an output shaft of the motor, the rack is fixed on the fixed seat along the X-axis direction, and a stop lever is arranged at the end part of the movable seat in the X-axis direction and used for limiting the end part of the sheet metal part.
The sheet metal part is a cover body with an open bottom, a bidirectional screw rod is arranged on the movable seat along the Y-axis direction, counter-rotating threads are arranged at two ends of the bidirectional screw rod, abutting blocks are symmetrically arranged on the two sections of counter-rotating threads, and the bidirectional screw rod is rotated to enable the two abutting blocks to abut against the inner side of the sheet metal part so as to center and position the sheet metal part.
The rolling flanging method for the sheet metal part windowing comprises the following steps of:
cutting a window on the sheet metal part, wherein the vertex angle of the window is of a round corner structure without a cutting joint;
fixing the sheet metal part on the positioning mechanism, so that the window opening of the sheet metal part is positioned in the working range of the multi-axis robot;
The multi-axis robot presses the flanging wheel on the edge of the window opening at an inclination angle of 30 degrees, and the pinch roller opens relative to the flanging wheel and stretches into the window opening;
The clamping driving piece rotates the pressing wheel, so that the pressing wheel is pressed below an edge, the edge is bent upwards in cooperation with the flanging wheel, and the end face of the flanging wheel and the wheel wall of the pressing wheel are both clung to the edge;
In the flanging process, the rim of the end face rotationally extrudes the sheet metal part to form a folding line of the edge, and the pressing wheel automatically adheres to the edge to rotate;
The multi-axis robot adjusts the flanging wheel, presses the flanging wheel on the edge of the windowed window at an inclination angle of 60 degrees and an inclination angle of 90 degrees in sequence, and performs flanging beat on the edge twice, and turns the edge to 90 degrees;
the clamping driving part is opened to reset the pressing wheel, the multi-axis robot removes the rolling and folding mechanism from the upper part of the sheet metal part, and the sheet metal part is taken away.
The beneficial effects of the invention are as follows:
The invention sets round corners at the top corners of the window, folds the corners continuously, and folds the corners gradually for a plurality of times, solves the problems that the broken edges are manually broken at the top corners, then the broken edges are repair welded, and the regular round corner folding cannot be realized.
According to the invention, the multi-axis robot is arranged on the portal frame, and the multi-axis robot is utilized to move and rotate the rolling and folding mechanism, so that the edge of the window is folded by the rolling and folding mechanism according to a set path, the automation degree is high, the operation precision is high, and the folding effect is flat and smooth. The edge rolling and folding mechanism comprises a folding wheel fixed on the mechanical arm and a pressing wheel capable of moving relative to the folding wheel, the folding part of the folding wheel is in a round table shape, the end face of the edge is positioned on the folding part, rolling friction is carried out between the end face and the edge, and in the rolling process, the rim of the end face presses the sheet metal part to form a folding line of the edge, so that the folding effect is smoother, tidy and high in precision.
The pinch roller of the invention is fixed on the second rotating shaft, an included angle is formed between the second rotating shaft and the extension line of the end surface of the flanging wheel, and by using the included angle, the clamping force applied by the clamping driving piece to the pinch roller has a component force perpendicular to the end face, the moment for bending the edge is increased, the clamping and flanging effects are more reliable, the flanging times can be reduced, and the processing efficiency is improved.
The pinch roller is arranged on the pinch arm of the welding type clamping cylinder, and the clamping cylinder occupies small space and is flexible to use. When the window opening area is smaller, the common linear driving module and the pinch roller assembly cannot move in the window opening, but the clamping cylinder is positioned outside the window opening, and the clamping cylinder rotates the pinch roller assembly by taking the hinging point of the pressing arm of the clamping cylinder as the circle center, so that the pinch roller assembly rotates relative to the flanging wheel, edge clamping flanging is realized, and the problem that the pinch roller assembly is difficult to move due to small window opening area is solved.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a schematic view of a prior art window opening structure before folding a sheet metal part;
FIG. 2 is a schematic overall structure of embodiment 1 of the present invention;
FIG. 3 is an enlarged construction view of an X-axis driving mechanism according to embodiment 1 of the present invention;
FIG. 4 is a schematic view showing a partial structure of another view angle of embodiment 1 of the present invention;
FIG. 5 is a schematic view of a roll-over mechanism according to embodiment 1 of the present invention;
FIG. 6 is another schematic view of the rolling mechanism of embodiment 1 of the present invention;
FIG. 7 is a schematic view of a rolling mechanism according to embodiment 1 of the present invention;
fig. 8 is a schematic view of a window structure according to embodiment 1 of the present invention;
FIG. 9 is a schematic diagram showing the hemming process of embodiment 1 of the present invention;
FIG. 10 is a schematic view of the back structure of the sheet metal part of the present invention;
FIG. 11 is a schematic overall structure of embodiment 2 of the present invention;
fig. 12 is a partial structural schematic diagram of embodiment 2 of the present invention.
The hydraulic drive system is characterized by comprising a sheet metal part 1, a windowing part 2, an edge 3, a vertex angle of an edge 4, a fixing seat 5, a movable seat 6, a motor 7, a gear 8, a rack 9, a stop lever 10, a two-way screw rod 11, a supporting block 12, a portal frame 14, a multi-shaft robot 15, a retainer 16, a flanging wheel 17, a pinch roller assembly 18, a clamping driving part 19, a supporting block 20, a first rotating shaft 21, an end face 22, a mounting part 23, a folding part 24, a flange of the end face 25, a solenoid valve 26, a stroke induction switch 27, a pressing arm 28, a wheel seat 29, a second rotating shaft 30, a pinch roller 31, a gap 32, a gasket 33, a first limiting block 34, a second limiting block 35, a positioning block 36, a portal frame guide rail 37, a second motor 38, a second rack 39, a second gear 39, a 40. X-axis guide rail 41, a working table 42, a linear driving device 43, a folding line 44 and a supporting reinforcing member.
Detailed Description
Example 1
As shown in fig. 2 to 9, this embodiment discloses a rolling hemming device for opening windows of sheet metal parts, the sheet metal part 1 is a cover body with an open bottom, such as a passenger car top cover, a plurality of openings 2, such as air conditioner assembly windows, are arranged on the sheet metal part 1, and the sizes of the openings 2 can be the same or different. Referring to fig. 8, after the edge of the window 2 is turned over, an edge 3 appears, and the vertex angle 4 of the edge is a rounded angle, and the rounded angle and the edge 3 are of an integrated structure without cutting and welding seams.
The rolling and flanging device comprises a positioning mechanism, a multi-axis robot and a rolling and flanging mechanism.
Referring to fig. 2 to 4, the positioning mechanism is used for clamping and positioning the sheet metal part 1, the positioning mechanism comprises a fixing seat 5, a moving seat 6, an X-axis driving mechanism and a Y-axis driving mechanism, the fixing seat 5 is horizontally fixed on a workbench 41, two parallel X-axis guide rails 40 are arranged on the fixing seat 5, the X-axis driving mechanism can drive the moving seat 6 to translate along the X-axis guide rails 40, the X-axis driving mechanism comprises a motor 7, a gear 8 and a rack 9 meshed with the gear 8, the motor 7 is fixed on the moving seat 6, the gear 8 is fixed on an output shaft of the motor 7, the rack 9 is fixed on the fixing seat 5 along the X-axis direction, a stop lever 10 is arranged at the end part of the moving seat 6 and is used for limiting and calibrating the end part of the sheet metal part 1. The sheet metal part 1 is placed on the movable seat 6, the end part of the sheet metal part 1 is abutted against the stop lever 10, then the motor 7 is started, the movable seat 6 is driven to move along the X-axis direction through the gear rack assembly, and the window opening 2 is moved to the coordinate position corresponding to the edge folding starting point.
Referring to fig. 4, a bidirectional screw rod 11 is installed on the movable seat 6 along the Y-axis direction, two ends of the bidirectional screw rod 11 are provided with reverse threads, for example, one end is a left-handed thread, the other end is a right-handed thread, two sections of reverse threads are symmetrically provided with abutting blocks 12, and the bidirectional screw rod 11 is rotated to enable the two abutting blocks 12 to abut against the inner side of the sheet metal part 1, so that the sheet metal part 1 is centrally positioned in the Y-axis direction, and edge folding precision is ensured.
A portal frame 13 is arranged above the positioning mechanism. The multi-axis robot 14 is fixed on the beam of the portal frame 13, can perform downward detection operation, and has sufficient operation space. The multi-axis robot 14 may be a six-axis robot, and the mechanical arm of the multi-axis robot 14 is provided with a rolling mechanism, which can move and rotate in six degrees of freedom to flexibly bend the edge 3. A movement track matched with the shape of the window opening 2 is stored in the multi-axis robot 14, and the multi-axis robot 14 drives the rolling and folding mechanism to move along the path of the window opening 2 and fold the edge 3 upwards. As shown in fig. 9, the rolling and folding mechanism can perform a plurality of bending processes on the edge 3, and the bending angle is gradually increased until the edge is bent into a right angle, for example, 30 °, 60 °, 90 ° bending is sequentially performed, and the number of bending times and the angle are selected, so that the processing efficiency and the bending quality are ensured.
The rolling mechanism comprises a retainer 15, a flanging wheel 16, a pinch roller assembly 17 and a clamping driving piece 18.
Referring to fig. 5 to 7, the holder 15 is fixed on the mechanical arm, a supporting block 19 is installed at the lower end of the holder 15, an included angle is formed between the supporting block 19 and the holder 15, a first rotating shaft 20 is installed at the other end of the supporting block 19, a hemming wheel 16 is coaxially installed on the first rotating shaft 20, and a bearing is installed between the hemming wheel 16 and the first rotating shaft 20 to improve the flexibility of rotation of the hemming wheel 16.
The edge folding wheel 16 has a planar end surface 21, and in the edge folding process, the end surface 21 is clung to the edge 3 of the window 2 and rotates and rubs with the edge 3, and the two are in surface contact, so that the flatness of the edge is ensured.
The edge folding wheel 16 comprises an integrally formed mounting part 22 and a folding part 23, the mounting part 22 is cylindrical, the folding part 23 is in a round table shape, and an included angle between the end face 21 of the folding part 23 and the round table side wall of the folding part is an acute angle, so that in the process that the edge folding wheel 16 rolls along the edge 3, the rim 24 of the end face presses the sheet metal part to form a folding line 43 of the edge, and the folding effect of the edge 3 is smooth and tidy through the folding line 43.
The clamping drive 18 is fixedly mounted on the holder 15, the clamping drive 18 being optionally a welded clamping cylinder, such as V/V2V 63.1 manufactured by TUNKERS, or a JCK heavy welded clamping cylinder of alder. The clamping cylinder has high self-locking force, the maximum holding torque is 1500Nm, the 5bar air pressure clamping torque is 380Nm, the strength and stability of edge bending force are ensured, the edge bending of the steel plate with the thickness of 1.2mm can be realized, and the clamping cylinder has high self-locking force, so that the pressing arm 27 can be continuously locked during bending, and the edge bending at the round corner is smooth and even. The clamping cylinder is a thin cylinder, occupies a small space, is suitable for compact operation space, such as windowing flanging in the embodiment, and the opening angle of the pressing arm 27 of the clamping driving piece 18 is adjusted through an adjusting screw in the clamping driving piece, so that the flanging angle can be freely adjusted and has high compatibility.
The clamping drive 18 includes a travel sensing switch 26 to sense whether the output travel of the clamping drive is in place. A solenoid valve 25 electrically connected to the clamping driver 18 is also mounted on the holder 15, and a controller is connected to the solenoid valve 25 to control the operation flow of the clamping driver 18.
The output end of the clamping driving piece 18 is hinged with a pressing arm 27, the other end of the pressing arm 27 is provided with a pressing wheel assembly 17, and the clamping driving piece 18 can rotate the pressing arm 27 and the pressing wheel assembly 17, so that the pressing wheel 30 presses the edge 3 on the end face 21 of the flanging wheel, and the edge 3 is bent.
Specifically, puck assembly 17 includes a wheel mount 28, a second axis of rotation 29, and a puck 30. The underside of the pressing arm 27 is provided with a plurality of threaded holes, and the wheel seat 28 is fastened on the pressing arm 27 through a plurality of bolts, so that the clamping force is effectively transmitted to the pressing wheel 30 by the clamping driving member.
Referring to fig. 6 and 7, the wheel base 28 is provided with a bearing, and the second shaft 29 is rotatably mounted on the bearing of the wheel base 28. An included angle a is formed between the second rotating shaft 29 and the extension line of the end face 21, the pressing wheel 30 is coaxially fixed on the second rotating shaft 29, the pressing wheel 30 is in a truncated cone shape with a wide upper part and a narrow lower part, a gap 31 for accommodating an edge is formed between the wheel wall of the pressing wheel 30 and the end face 21, and the wheel wall of the pressing wheel 30 is parallel to the end face 21 at the gap. An included angle a is formed between the second rotating shaft 29 and the extension line of the end face 21, so that the clamping force applied by the clamping driving piece 18 to the pressing wheel 30 has a component force perpendicular to the end face 21, and therefore the pressing wheel 30 is matched with the end face 21, and the edge 3 can be bent more reliably and effectively. The pinch roller 30 is in a truncated cone shape with a wide upper part and a narrow lower part, and after the pinch roller 30 is rotated in place by the clamping driving piece 18, a gap 31 between the pinch roller 30 and the end face 21 just accommodates the edge 3, so that the edge 3 is bent. The wheel walls of the pressing wheel 30 are parallel to the end face 21 at the gap, namely, the pressing wheel and the edge are simultaneously in rolling friction, and the pressing wheel, the edge and the edge are matched with each other, so that the rolling edge folding effect of the edge is neat and smooth.
The gasket 32 is arranged between the pressing arm 27 and the wheel seat 28, and the number of the gasket 32 can be flexibly adjusted to adjust the width of the gap 31 between the pressing wheel and the end surface, so that the device is suitable for edge folding with different thicknesses and has strong compatibility.
The first stopper 33 is installed on the back of the pressing arm 27, the second stopper 34 meshed with the first stopper 33 is installed on the retainer 15, and in the flanging process, the first stopper 33 abuts against the second stopper 34 to physically limit the rotation angle of the clamping driving piece 18, so that the pinch roller assembly is prevented from rotating excessively. In addition, because the clamping force output by the clamping driving piece 18 is larger, and the first limiting block 33 is abutted against the second limiting block 34, the end part of the pressing arm 27 can be applied with reverse pressure, and when the pressing arm 27 is subjected to larger pressure, the lower end part of the pressing arm 27 is suspended, so that the pressing wheel assembly 17 is deformed when being pressed, and the edge folding precision and the flatness are prevented from being influenced.
In this embodiment, the radius of the fillet of the edge 3 is 20mm or more, and the diameter of the end of the pressing wheel 30 is 15mm or more. If the fillet radius of the edge 3 is smaller and the diameter of the pinch roller 30 is larger, the pinch roller 30 cannot fold the fillet when rolling over the fillet. In addition, referring to fig. 10, the back of the sheet metal part is usually required to install a supporting reinforcement 44 (e.g. a tube), the supporting reinforcement 44 is closer to the window, and the distance b from the transverse edge and the vertical edge of the window 2 to the supporting reinforcement is at least 10mm, so as to ensure that the hemming process is completed smoothly. The round corner radius of the window is large, the diameter of the pressing wheel is small, the pressing wheel 30 cannot interfere with the supporting reinforcement 44, and the edge folding is smoothly carried out.
The rolling flanging method for the sheet metal part windowing comprises the following steps of:
Cutting a window 2 on the sheet metal part 1, polishing the window edge to be smooth if necessary, wherein the vertex angle of the window is of a fillet structure without a kerf;
Fixing the sheet metal part 1 on a positioning mechanism, aligning one end of the sheet metal part with a stop lever 10, driving a movable seat 6 to move by a motor 7, closing the motor 7 after the window 2 is positioned at an operation origin, and positioning the window 2 of the sheet metal part in the operation range of a multi-axis robot 14;
The multi-axis robot 14 presses the flanging wheel 16 on the edge 3 of the window at an inclination angle of 30 degrees, and the pressing wheel 30 stretches out relative to the flanging wheel 16 and stretches into the lower part of the window 2;
the clamping driving piece 18 rotates the pressing wheel 30, so that the pressing wheel 30 is pressed below the edge 3, the edge 3 is bent upwards in cooperation with the edge folding wheel 16, the bending angle is 30 degrees, and the end face 21 of the edge folding wheel 16 and the wheel wall of the pressing wheel 30 are tightly attached to the edge 3;
In the flanging process, the rim 24 of the end face rotationally extrudes the sheet metal part 1 to form a fold line 43 of the edge, and meanwhile, the pinch roller 30 automatically adheres to the edge 3 to rotate;
The clamping driving piece 18 loosens the pinch roller assembly 17, the mechanical arm of the multi-axis robot 14 rotates, the inclination angle of the edge folding wheel 16 is adjusted, the pinch roller assembly 17 is pressed on the windowed edge 3 at the inclination angles of 60 degrees and 90 degrees in sequence, the clamping driving piece 18 is correspondingly pressed on the pinch roller assembly 17 again, the pinch roller assembly is matched with the edge folding wheel 16, two edge folding beats are completed on the edge 3, and the edge is folded to be 90 degrees;
the clamping driving member 18 is opened and the pressing wheel 30 is reset, the multi-axis robot 14 removes the rolling mechanism from above the sheet metal part 1, and the sheet metal part 1 is removed.
The device is used for opening and flanging the automobile top cover air conditioner, the flanging speed can reach 400mm/s, and one-step flanging forming is realized without repair welding.
Example 2
As shown in fig. 11 and 12, the difference between the present embodiment and the embodiment is that the positioning mechanism of the present embodiment is fixed, and the gantry moves relative to the positioning mechanism, so as to implement the hemming of the window opening on the sheet metal part.
The positioning mechanism is provided with a linear driving device 42 extending along the Y axis, and the linear driving device 42 can be a screw rod or a linear module. Two X-axis guide rails 40 are arranged on the front and rear groups of linear driving devices 42, positioning blocks 35 are arranged at two ends of the X-axis guide rails 40, the distance between the two X-axis guide rails 40 can be changed by the linear driving devices 42, the positioning blocks 35 are abutted in the side wall of the cover body of the sheet metal part 1, and the sheet metal part is positioned in the Y-axis direction.
Referring to fig. 12, a gantry rail 36 extending along the X-axis is mounted on the table, and two columns of the gantry 13 are movable along the two gantry rails. A second rack 38 is fixed on the inner side wall of the portal frame guide rail 36, a second motor 37 is installed on the portal frame 13, a second gear 39 meshed with the second rack 38 is installed on the output shaft of the second motor 37, and after the second motor 37 is started, the second gear 39 and the second rack 38 drive the portal frame 13 to move along the portal frame guide rail 36 until the multi-axis robot 14 stops moving when being positioned at the folding origin above the window.
Other structures of this embodiment are the same as those of embodiment 1.
The foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
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| CN202110991964.7A CN113714358B (en) | 2021-08-26 | 2021-08-26 | A rolling folding device for opening a window of a sheet metal part and a folding method thereof |
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| JP5210805B2 (en) * | 2008-11-05 | 2013-06-12 | 本田技研工業株式会社 | Roll hemming device |
| DE102016211571A1 (en) * | 2016-06-28 | 2017-12-28 | Audi Ag | Rollfalzvorrichtung and method for folding an edge portion of a sheet metal part |
| KR102226746B1 (en) * | 2019-08-12 | 2021-03-11 | (주)우신시스템 | Sun roof roll hemming apparatus |
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| CN218168333U (en) * | 2021-08-26 | 2022-12-30 | 常州孟腾智能装备有限公司 | Rolling edge folding device for sheet metal part windowing |
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