A tooling and method for low-pressure injection molding of soft-pack edges for automotive interior A, B, and C pillars.

Abstract

This invention discloses a low-pressure injection molding edge-reversing fixture and method for automotive interior A, B, and C pillars, comprising a base plate, on which a first hinge seat, a second hinge seat, and a support seat are sequentially arranged. A cylinder is mounted on the first hinge seat, an ultrasonic welding device is mounted on the second hinge seat, and a support mechanism is provided on the support seat. The output end of the cylinder is connected to the ultrasonic welding device. The support mechanism includes a first limiting plate, a second limiting plate, and a support roller. The first and second limiting plates perform double-point locking on the folded edge of the injection molded part, the support roller supports the injection molded part, and the ultrasonic welding device welds the folded edge of the injection molded part. During ultrasonic welding, the injection molded part is pressed down by the first and second limiting plates, preventing bulges between adjacent ultrasonic welding points and avoiding a wavy weld edge on the entire folded edge.

Description

Technical Field

[0001] This invention relates to the field of mechanical tooling technology, specifically to a tooling and method for reverse wrapping the edge of low-pressure injection molding soft padding on the A, B, and C pillars of automotive interiors. Background Technology

[0002] Currently, automotive A, B, and C pillar interior panels typically have a soft-pack material wrapped around the plastic surface. Low-pressure injection molding (LPI) can effectively achieve one-step molding of injection-molded parts with this material. After LPI injection molding, excess soft-pack material remains at the edges of the component frame. This excess material needs to be folded over and attached to the inside of the frame, then ultrasonically welded to fix it to the frame. Traditionally, the folding and wrapping of the soft-pack edges on injection-molded parts is done manually. However, manual methods suffer from drawbacks such as wasted labor, large product quality errors, and inconsistent product quality.

[0003] Existing technologies include some automatic flanging and welding fixtures, but these fixtures have the following problems: by clamping the folded edge with a single-point clamping fixture and then performing ultrasonic welding, raised waves will appear between adjacent ultrasonic welding points, resulting in a wavy welded edge. This not only leads to poor welding stability and easy detachment of the covering material from the injection molded part, but also affects the aesthetics. In addition, the surface of the ABC pillar guard plate has a large curvature, which makes it easy to warp inward when placed in the welding fixture, affecting the welding quality. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a tooling and method for reverse-wrapping the edge of low-pressure injection molded soft padding on the ABC pillars of automotive interiors. This method can avoid the appearance of a wavy weld edge on the entire folded edge, thereby improving the quality of the folded edge welding of low-pressure injection molded parts and soft padding materials.

[0005] The technical solution of the present invention is as follows:

[0006] In a first aspect of the invention, a low-pressure injection molding edge-reversing tooling for automotive interior A, B, and C pillars is provided, comprising a base plate, on which a support seat, a first hinge seat, and a second hinge seat are sequentially arranged. An ultrasonic welding device is mounted on the first hinge seat, and a cylinder is mounted on the second hinge seat. A support mechanism is provided on the support seat, and the output end of the cylinder is connected to the ultrasonic welding device. The support mechanism includes a first limiting plate, a second limiting plate, and a support roller. The first and second limiting plates perform double-point clamping on the folded edge of the injection molded part, the support roller supports the injection molded part, and the ultrasonic welding device welds the folded edge of the injection molded part.

[0007] In some embodiments of the present invention, the ultrasonic welding device is mounted on a first hinged seat via a rocker seat, and the rocker seat is hinged to the first hinged seat.

[0008] In some embodiments of the present invention, the rear end of the rocker seat is connected to the output end of the cylinder, and the front end of the ultrasonic welding device is provided with a serrated pressure head, which is located between the first limiting plate and the second limiting plate.

[0009] In some embodiments of the present invention, the first limiting plate and the second limiting plate are respectively mounted on the top of the support base via a first side bracket and a second side bracket, and the first limiting plate and the second limiting plate are arranged opposite to each other.

[0010] In some embodiments of the present invention, a nylon pad is provided between the first side bracket and the second side bracket, and the nylon pad is fixed to the top of the support base.

[0011] In some embodiments of the present invention, the support roller is mounted on the front side of the support base via a support plate, the bottom of the support plate abuts against an adjusting screw screwed onto a fixed base, and the fixed base is fixed to the front side of the support base.

[0012] In some embodiments of the present invention, the support roller is fixed to the support plate by a rotating shaft.

[0013] In some embodiments of the present invention, the support plate is provided with a long groove, and bolts are installed in the long groove to install the support plate on the support base.

[0014] In some embodiments of the present invention, the first hinge seat, the second hinge seat, and the support seat are all fixedly installed with the base plate.

[0015] In a second aspect of the invention, a method for using a low-pressure injection molding edge-reverse wrapping tooling for automotive interior A, B, and C pillars is provided, comprising:

[0016] After the large surface of the injection molded part is welded to the soft packaging material, the folded edge of the injection molded part is folded and inserted between the first limiting plate, the second limiting plate and the support roller. Then the ultrasonic welding device is started, and the piston rod of the cylinder repeatedly extends and retracts, driving the rocker seat to carry the ultrasonic welding device and the front sawtooth pressure head to perform ultrasonic welding on the folded part. The ultrasonic welding operation is completed by moving the position of the injection molded part relative to the sawtooth pressure head.

[0017] One or more technical solutions of the present invention have the following beneficial effects:

[0018] (1) The low-pressure injection molding soft pack edge wrapping tooling for automotive interior ABC pillars provided by the present invention ensures that during each ultrasonic welding, the injection molded part is pressed by the first limiting plate and the second limiting plate. The double-point clamping tooling holds the folded edge and then performs ultrasonic welding, which avoids the appearance of raised waves between adjacent ultrasonic welding points and avoids the entire folded edge from having a wavy welding edge. This not only ensures good welding stability and prevents the covering material from easily detaching from the injection molded part, but also makes it more aesthetically pleasing.

[0019] (2) The automotive interior ABC pillar low-pressure injection molded soft pack edge reverse wrapping tooling provided by the present invention can adjust the height of the support plate by adjusting the adjusting screw according to the total thickness of the low-pressure injection molded part and the soft pack, so that the gap between the support roller and the left limit plate and the right limit plate meets the requirements of the total thickness of the low-pressure injection molded part and the soft pack, and has good versatility.

[0020] (3) The low-pressure injection molding soft pack edge wrapping tooling for automotive interior ABC pillars provided by the present invention installs an ultrasonic welding device on a rocking seat, the rocking seat is hinged to a second hinge seat, and the rocking seat and ultrasonic welding device are driven to rotate by the extension and retraction motion of the cylinder, thereby realizing the up and down movement of the sawtooth pressure head at the front end of the ultrasonic welding device, and thus realizing the pressure function in the welding process.

[0021] (4) The automotive interior ABC pillar low-pressure injection soft pack edge reverse wrapping tooling provided by the present invention, when in use, the injection molded part to be welded is inserted between the first limiting plate, the second limiting plate and the support roller, which realizes the stable support of the injection molded part to be welded. The support roller is adapted to the curvature of the injection molded part surface, and the stable support of the injection molded part is realized during the welding process, so as to avoid the injection molded part from warping inward, thereby improving the welding quality. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the low-pressure injection molding soft-pack edge wrapping tooling for the ABC pillars of automotive interiors according to the present invention.

[0023] In the picture:

[0024] 1. Base plate; 2. Swing seat; 3. Cylinder; 4. Ultrasonic welding device; 5. Support mechanism;

[0025] 10. First hinge seat; 11. Second hinge seat; 12. Support seat; 12-1. Nylon pad; 12-2. Side bracket; 12-3. First limiting plate; 12-4. Second limiting plate;

[0026] 120. Fixed base;

[0027] 40. Serrated pressure head;

[0028] 50. Support plate; 50-1. Long groove; 51. Support roller; 52. Adjusting screw. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] Example 1

[0031] In a typical embodiment of the present invention, a low-pressure injection molding edge-reversing tooling for automotive interior A, B, and C pillars is provided, comprising a base plate 1, on which a support seat 12, a first hinge seat 10, and a second hinge seat 11 are sequentially arranged. An ultrasonic welding device 4 is installed on the first hinge seat 10, and a cylinder 3 is installed on the second hinge seat 11. A support mechanism 5 is provided on the support seat 12, and the output end of the cylinder 3 is connected to the ultrasonic welding device 4. The support mechanism 5 includes a first limiting plate 12-3, a second limiting plate 12-4, and a support roller 51. The first limiting plate 12-3 and the second limiting plate 12-4 perform double-point clamping on the folded edge of the injection molded part, the support roller 51 supports the injection molded part, and the ultrasonic welding device 4 welds the folded edge of the injection molded part.

[0032] In this embodiment, the first hinge seat 10, the second hinge seat 11, and the support seat 12 are all fixedly installed on the base plate 1, and are spaced a certain distance apart from each other. The second hinge seat 11 is hingedly connected to the bottom of the cylinder 3. The bottom of the first hinge seat 10 is fixed to the upper surface of the base plate 1 by bolts. The top of the first hinge seat 10 is provided with a groove, making the first hinge seat 10 have a Y-shaped structure. The side wall of the first hinge seat 10 is hingedly connected to the rocker seat 2. The rocker seat 2 can rotate at a certain angle in the groove at the top of the first hinge seat 10. The ultrasonic welding device 4 is installed on the first hinge seat 10 through the rocker seat 2. The rocker seat 2 is provided with a shape that matches the bottom shape of the ultrasonic welding device 4, so that the bottom of the ultrasonic welding device 4 is embedded in the rocker seat 2, providing stable support for the ultrasonic welding device 4. Ultrasonic welding utilizes high-frequency vibration waves transmitted to the surfaces of two objects to be welded. Under pressure, the surfaces of the two objects rub against each other, forming a fusion between molecular layers. In this embodiment, the ultrasonic welding device adopts an existing structure.

[0033] Furthermore, the bottom rear end of the swing seat 2 is connected to the output end of the cylinder 3, and the front end of the ultrasonic welding device 4 is provided with a sawtooth pressure head 40. The swing seat 2 is driven to swing within a certain angle by the extension and retraction of the cylinder 3, thereby driving the ultrasonic welding device 4 and the sawtooth pressure head 40 at its front end to rotate at a certain angle for welding. The sawtooth pressure head 40 is located between the first limiting plate 12-3 and the second limiting plate 12-4.

[0034] In this embodiment, the first limiting plate 12-3 and the second limiting plate 12-4 are both mounted on the top of the support base 12 via the side bracket 12-2. The first limiting plate 12-3 and the second limiting plate 12-4 are arranged opposite to each other. The first limiting plate 12-3 and the second limiting plate 12-4 are both made of a material with a certain elasticity. The first limiting plate 12-3 and the second limiting plate 12-4 press against the injection molded part to form a double-point pressing position.

[0035] In this embodiment, a nylon pad 12-1 is provided between the two side brackets used to install the first limiting plate 12-3 and the second limiting plate 12-4. The nylon pad 12-1 is fixed to the top of the support base 12, and the nylon pad 12-1 is provided to prevent the soft package edge from failing to abut and compact.

[0036] In this embodiment, the support roller 51 is mounted on the front side of the support base 12 via the support plate 50. The bottom of the support plate 50 abuts against the adjusting screw 52 screwed onto the fixed base 120. The fixed base 120 is fixed to the front side of the support base 12. The support roller 51 is fixed to the support plate 12 via a rotating shaft. The support roller 51 adapts to the curvature of the ABC pillar guard plate surface, providing stable support for the injection molded part during the welding process, preventing the injection molded part from warping inward, and thus improving the welding quality.

[0037] Furthermore, the support plate 50 is provided with a long groove 50-1, and bolts are installed in the long groove 50-1. The support plate 50 is installed on the support base 12 by bolts. The distance between the support plate 50 and the fixed base 120 can be adjusted by the setting adjustment screw 52. Then, the support plate 50 is fixed on the support base 12 by bolts, thereby realizing the adjustment of the support height of the support roller 51 to meet the different total thickness requirements of low-pressure injection molded parts and soft packaging, and has good versatility.

[0038] The working principle of the low-pressure injection molding soft-pack edge wrapping tooling for automotive interior A, B, and C pillars provided in this embodiment is as follows:

[0039] After the injection molded part is welded to the soft packaging material, the operator holds the welded part and folds the edge to be folded into the space between the first limiting plate 12-3, the second limiting plate 12-4 and the support roller 51. Then the ultrasonic welding device 4 is started, and the piston rod of the cylinder 3 repeatedly extends and retracts, driving the rocker seat 2 to carry the ultrasonic welding device 4 and its front-end sawtooth pressure head 40 to perform ultrasonic welding on the folded part. The operator only needs to move the position of the welded part relative to the sawtooth pressure head 40 to complete the ultrasonic welding operation.

[0040] During each ultrasonic welding process, the welding points are pressed down by the first limiting plate 12-3 and the second limiting plate 12-4. The folded edge is held in place by a double-point clamping fixture before ultrasonic welding. This prevents raised waves from appearing between adjacent ultrasonic welding points and avoids the entire folded edge from having a wavy welding edge. This not only ensures good welding stability and prevents the covering material from easily detaching from the injection molded part, but also makes it more aesthetically pleasing.

[0041] Furthermore, based on the total thickness of the low-pressure injection molded part and the soft package, the height of the support plate 50 is adjusted by adjusting the adjusting screw 52, ​​thereby ensuring that the gap between the support roller 51 and the left limit plate 12-3 and the right limit plate 12-4 meets the requirements of the total thickness of the low-pressure injection molded part and the soft package, thus having good versatility.

[0042] Example 2

[0043] In a typical embodiment of the present invention, a working method for a low-pressure injection molding edge wrapping tooling for automotive interior A, B, and C pillars is provided, comprising:

[0044] After the large surface of the injection molded part is welded to the soft packaging material, the folded edge of the injection molded part is folded and inserted between the first limiting plate, the second limiting plate and the support roller. Then the ultrasonic welding device is started, and the piston rod of the cylinder repeatedly extends and retracts, driving the rocker seat to carry the ultrasonic welding device and the front sawtooth pressure head to perform ultrasonic welding on the folded part. The ultrasonic welding operation is completed by moving the position of the injection molded part relative to the sawtooth pressure head.

[0045] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A tooling for reverse wrapping the edge of a low-pressure injection molded soft-pack on the A, B, and C pillars of an automotive interior, characterized in that, The device includes a base plate, on which a support seat, a first hinge seat, and a second hinge seat are sequentially arranged. An ultrasonic welding device is installed on the first hinge seat, and a cylinder is installed on the second hinge seat. A support mechanism is provided on the support seat, and the output end of the cylinder is connected to the ultrasonic welding device. The support mechanism includes a first limiting plate, a second limiting plate, and a support roller. The first and second limiting plates perform double-point locking on the folded edge of the injection molded part, the support roller supports the injection molded part, and the ultrasonic welding device welds the folded edge of the injection molded part. The support roller is mounted on the front side of the support base via a support plate. The bottom of the support plate abuts against an adjusting screw screwed onto a fixed base. The fixed base is fixed to the front side of the support base. The support rollers are fixed to the support plate by a rotating shaft; The support plate is provided with a long groove, and bolts are installed in the long groove. The support plate is installed on the support base by means of bolts. The first hinge seat, the second hinge seat, and the support seat are all fixedly installed on the base plate.

2. The low-pressure injection molding soft-pack edge wrapping tooling for automotive interior A, B, and C pillars as described in claim 1, characterized in that, The ultrasonic welding device is mounted on the first hinge seat via a swing base, and the swing base is hinged to the first hinge seat.

3. The low-pressure injection molding soft-pack edge wrapping tooling for automotive interior A, B, and C pillars as described in claim 2, characterized in that, The bottom rear end of the rocker seat is connected to the output end of the cylinder, and the front end of the ultrasonic welding device is provided with a serrated pressure head, which is located between the first limiting plate and the second limiting plate.

4. The low-pressure injection molding soft-pack edge wrapping tooling for automotive interior A, B, and C pillars as described in claim 1, characterized in that, The first limiting plate and the second limiting plate are respectively installed on the top of the support base via the first side bracket and the second side bracket, and the first limiting plate and the second limiting plate are arranged opposite to each other.

5. The low-pressure injection molding soft-pack edge wrapping tooling for automotive interior A, B, and C pillars as described in claim 4, characterized in that, A nylon pad is provided between the first side bracket and the second side bracket, and the nylon pad is fixed to the top of the support base.

6. A method for using a low-pressure injection molding soft-pack edge wrapping tooling for automotive interior A, B, and C pillars as described in any one of claims 1-5, characterized in that... include: After the large surface of the injection molded part is welded to the soft packaging material, the folded edge of the injection molded part is folded and inserted between the first limiting plate, the second limiting plate and the support roller. Then the ultrasonic welding device is started, and the piston rod of the cylinder repeatedly extends and retracts, driving the rocker seat to carry the ultrasonic welding device and the front sawtooth pressure head to perform ultrasonic welding on the folded part. The ultrasonic welding operation is completed by moving the position of the injection molded part relative to the sawtooth pressure head.

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