An automatic hot bending and shaping device for a sealing strip and a hot bending and shaping method

Abstract

The present invention discloses an automatic hot bending and shaping device for a sealing strip and a hot bending and shaping method, which includes a rotary indexing table performing a rotary motion, a plurality of hot bending and shaping toolings arranged on the rotary indexing table at equal angles, a hot baking unit, a cooling unit arranged around the rotary indexing table, and a loading and unloading station for loading and unloading. After the product is heated and formed, the present invention performs secondary bending and shaping again according to the requirements of the drawing, improves the matching degree of the door sheet metal arc shape for automobile manufacturers, maximally plays a sealing role, reduces various noises during the driving process of the automobile, and meets the customers' external aesthetics of the vehicle and the comfort of the customers when using the vehicle.

Description

Technical Field

[0001] The present invention belongs to the technical field of machinery, and particularly relates to an automatic hot bending and shaping device for a sealing strip and a hot bending and shaping method.

Background Art

[0002] The rapid development of modern society has brought about a great improvement in the automobile manufacturing process, and the quality and technical requirements for parts have become increasingly high. In automobile seals, the arc-shaped styling of the sealing strip that enhances the overall aesthetic appearance of the vehicle model is increasingly favored by vehicle manufacturers and end-users. The bending accuracy and aesthetic appearance of the sealing strip also have higher and higher requirements for the process. However, the traditional process for the bending arc forming process of new PP materials is not mature, the bending arc consistency is unsatisfactory, the bending forming process is relatively lacking compared with traditional EPDM materials, the arc rebound of products made by traditional processes is relatively large, it is difficult to shape, and the traditional process equipment is complex and expensive.

[0003] Therefore, it is necessary to provide an automatic hot bending and shaping device for a sealing strip and a hot bending and shaping method to solve the above problems.

Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a bending forming method for an automobile sealing strip and a bending forming device for an automobile sealing strip, which can bend-process the automobile sealing strip made of PP material and can significantly improve the accuracy and stability of the bending arc.

[0005] The present invention realizes the above purpose through the following technical solutions: An automatic hot bending and shaping device for a sealing strip, which includes a rotary indexing table that performs rotary motion, a plurality of hot bending and shaping toolings arranged at equal angles on the rotary indexing table, a hot baking unit, a cooling unit, and a loading and unloading station for loading and unloading, which are arranged around the rotary indexing table; the hot bending and shaping tooling includes product support spring pieces arranged in parallel and used for supporting the product, a radian positioning unit located outside the front ends of the two product support spring pieces and consistent with the designed radian of the product, a bending driving unit that drives the front end regions of the two product support spring pieces to expand outward to both sides and stick to the surface of the radian positioning unit, and an end pressing unit that presses the end of the product to prevent it from warping during the cooling and shaping process.

[0006] Further, a pressing device for pressing the product is arranged on the upper part of the product support spring piece.

[0007] Further, the bending driving unit includes a first cylinder, a connecting block that is driven by the first cylinder to perform horizontal linear motion, and connecting arms hinged on both sides of the connecting block and fixedly connected to the front ends of the two product support spring pieces.

[0008] Further, the radian positioning unit includes a vertical plate, a plurality of screw rods arranged on the vertical plate and in mating connection with the threaded holes on the vertical plate, and a radian adjustment block passing through the threaded holes and fixedly connected to the plurality of screw rods.

[0009] Further, a scale is arranged on one side of the radian adjustment block and corresponding to the adjustment direction of the radian adjustment block one by one.

[0010] Further, the radian adjustment block is locked on the bottom plate by a locking screw.

[0011] Further, the end pressing unit includes a second cylinder, a rod member that moves up and down under the drive of the second cylinder, and a pressing block fixed below the rod member and used for pressing the end of the product.

[0012] Another object of the present invention is to provide an automatic hot bending and shaping method for a sealing strip, which includes the following steps:

[0013] 1) Provide a radian positioning unit, and the radian positioning unit has an arc surface consistent with the designed radian of the sealing strip;

[0014] 2) Fix the sealing strip on a product support elastic sheet, and heat the section of the sealing strip that needs to be bent at a set temperature for a set time;

[0015] 3) Drive the front end of the product support elastic sheet towards the arc surface through a bending driving device, so that the product is bent into a designed radian state;

[0016] 4) Continue the secondary heat baking for a set time;

[0017] 5) Use an end pressing unit to press the end of the sealing strip, and then perform cooling to achieve the final shaping.

[0018] Further, the radian positioning unit includes a vertical plate, a plurality of screw rods arranged on the vertical plate and in mating connection with the threaded holes on the vertical plate, and a plurality of radian adjustment blocks fixedly arranged at the ends of the screw rods. Adjust the positions of the radian adjustment blocks according to the designed radian of the seal, so that the arc surface formed by the same-end surfaces of all the radian adjustment blocks is consistent with the designed radian of the sealing strip.

[0019] Further, the bending driving unit includes a first cylinder, a connecting block driven by the first cylinder to perform horizontal linear motion on a slide rail, and connecting arms hinged on both sides of the connecting block and respectively fixedly connected to the front ends of two product support elastic sheets.

[0020] Compared with the prior art, the beneficial effects of an automatic hot bending and shaping device and a hot bending and shaping method for a sealing strip of the present invention are as follows: The product is automatically transferred at the hot drying, cooling, and loading and unloading stations through a rotating disk, realizing fully automated hot bending and shaping operations, greatly improving production efficiency; and a hot bending and shaping tooling is used to fix the product, and an automatic bending drive and a bending positioning device are used to maintain the bent state of the product, with high bending accuracy. The product is softened by secondary heating, and is in a bent state before the second heating, and the end of the product is pressed by a pressing device and then cooled, effectively preventing the phenomenon of the end of the product warping due to stress changes during the cooling and shaping process; the bending, hot drying and shaping, and cooling of the product are completed through a series of combined actions of a jig bending and shaping device. The device uses an automated device, is highly reliable, has high bending accuracy, can effectively improve the matching degree with the arc shape of the car door panel, play the role of sealing to the greatest extent, reduce various noises during the driving of the car, and meet the customer's external aesthetics of the vehicle and the comfort of the customer when using the vehicle.

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of an embodiment of the present invention;

[0022] Figure 2 It is a schematic structural diagram of a hot bending and shaping tooling of an embodiment of the present invention;

[0023] Figure 3 It is a schematic structural diagram of a bending drive / end pressing unit of an embodiment of the present invention;

[0024] Figure 4 It is a schematic structural diagram of a radian positioning unit of an embodiment of the present invention;

[0025] Figure 5 It is a top view structural diagram of the product bending drive state in an embodiment of the present invention;

[0026] The numbers in the figure represent:

[0027] 100 Automatic hot bending and shaping device for sealing strips;

[0028] 1 Rotary indexing disk; 2 Hot bending and shaping tooling; 21 Base plate; 22 Product support spring piece; 23 Pressing device; 24 Radian positioning unit; 241 Vertical plate; 242 Screw rod; 243 Radian adjustment block; 244 Scale; 25 Bending drive unit; 251 First cylinder; 252 Connecting block; 253 Connecting arm; 254 Connecting joint; 255 Slide rail; 26 End pressing unit; 261 Second cylinder; 262 Rod member; 263 Pressing block; 3 Hot drying unit; 4 Cooling unit; 5 Loading and unloading station.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] Embodiment:

[0030] Please refer to Figures 1 - 5 , in this embodiment, there is an automatic hot bending and shaping device 100 for a sealing strip, which includes a rotary indexing table 1 performing rotary motion, three hot bending and shaping tooling 2 arranged on the rotary indexing table 1 at equal angles, a hot baking unit 3 arranged around the rotary indexing table 1, a cooling unit 4, and a loading and unloading station 5 for loading and unloading.

[0031] The hot baking unit 3 and the cooling unit 4 are modules that can be directly purchased from the market in the prior art. Therefore, they will not be elaborated in this embodiment.

[0032] The hot bending and shaping tooling 2 includes a bottom plate 21, product support elastic pieces 22 arranged in parallel and used for supporting the product, a pressing device 23 located above the product support elastic pieces 22 and used for pressing the product, a radian positioning unit 24 located outside the front ends of the two product support elastic pieces 22 and consistent with the designed radian of the product, a bending driving unit 25 for driving the front end regions of the two product support elastic pieces 22 to expand outward to both sides and stick to the surface of the radian positioning unit 24, and an end pressing unit 26 for pressing the end of the product to prevent it from warping during the cooling and shaping process.

[0033] A part of the product support elastic piece 22 is fixed on a fixed mounting seat, and its front section is cantilevered outside, so that the front section has bending freedom.

[0034] The pressing device 23 is a mechanical elbow press or a manual elbow press, which prevents the product from being displaced due to the expansion of the product support elastic piece 22 driven by the bending driving unit 25 during the bending process.

[0035] The radian positioning unit 24 includes a vertical plate 241 with four threaded holes on its surface, a number of screw rods 242 arranged on the vertical plate 241 and in threaded connection with the threaded holes on the vertical plate 241, and a radian adjusting block 243 fixedly connected to the number of screw rods 242 through the threaded holes. A scale 244 is arranged on one side of the radian adjusting block 243 and corresponding to the adjusting direction of the radian adjusting block 243. The locking screw is locked on the bottom plate 21 through the radian adjusting block 243 with a waist-shaped surface. When the product needs to be bent, the four radian adjusting blocks 243 are adjusted to specific positions according to the designed radian to form a radian consistent with the product, and then locked on the bottom plate 21 through the locking screw for fixation.

[0036] The bending drive unit 25 includes a first cylinder 251, a connecting block 252 driven by the first cylinder 251 to perform horizontal linear motion, and connecting arms 253 hinged on both sides of the connecting block 252 and respectively fixedly connected to the front ends of the two product supporting springs 22. A connecting joint 254 is provided at the end of the connecting arm 253, and the product supporting spring 22 is screwed on the connecting joint 254. A slide rail 255 is provided on the bottom plate. The first cylinder 251 drives the connecting block 252 to perform horizontal linear motion on the slide rail 255, and the connecting block 252 pushes the two connecting arms 253 to expand outward. The connecting joint 254 brings the two product supporting springs 22 to the surface of the curvature adjustment block 253, so that the product is bent into a set curvature.

[0037] The end clamping unit 26 includes a second cylinder 261, a rod 262 driven by the second cylinder 1 to move up and down, and a clamping block 263 fixed under the rod 262 and used to clamp the end of the product. After the product is bent and shaped and heated before cooling, the second cylinder 261 drives the clamping block 3 to clamp and fix the end of the product to prevent the product from deforming due to temperature changes during the cooling process, resulting in the end tip being lifted.

[0038] In the present embodiment, the automatic hot bending and shaping device 100 for sealing strips adjusts the position of the curvature adjusting block 233 according to the curvature of the product design before processing and fixes it. The product is placed on the hot bending and shaping tooling 2 on the rotating indexing plate 1 at the loading and unloading station 5. Then the hot bending and shaping tooling 2 rotates to the position of the hot drying unit 3. The hot drying gun is lowered to heat the product at the front end of the product supporting spring sheet 22 for 60 seconds. Then, the front end areas of the two product supporting spring sheets 22 are driven by the first cylinder 251 to expand outward to both sides and stick to the curvature positioning unit 2. 4, and then the hot drying gun comes down to perform secondary hot drying on the product for 10 seconds to complete the shaping. Then, the rotary indexing plate 1 rotates to the cooling unit 4. In order to prevent the product from deforming and warping due to temperature changes during the cooling process, the second cylinder 261 drives the pressing block 263 to press the end of the product and then blow cold air to cool the product, that is, the final shaping is completed. When the product is bent and shaped, it is rotated by the rotary indexing plate 1 to the loading and unloading station 5, and the completed product is taken away manually.

[0039] The present invention provides an automatic hot bending and shaping device and a hot bending and shaping method for sealing strips, which complete a series of combined actions of bending, hot baking and shaping, and cooling the product through a clamp bending and shaping device. The device adopts an automated device, is highly reliable, and has high bending accuracy. It can effectively improve the matching degree with the arc shape of the door sheet metal, maximize the sealing effect, reduce various noises during the driving process of the car, and meet the customer's aesthetic requirements for the vehicle's appearance and the customer's comfort when using the vehicle.

[0040] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention.

Claims

1. An automatic hot bending and shaping device for a sealing strip, characterized in that: It includes a rotary indexing table that performs rotary motion, several hot bending and shaping toolings arranged at equal angles on the rotary indexing table, a hot drying unit, a cooling unit, and a loading and unloading station for loading and unloading, which are arranged around the rotary indexing table; the hot bending and shaping tooling includes product support elastic pieces that are arranged in parallel and used to support the product, a radian positioning unit located outside the front ends of the two product support elastic pieces and consistent with the designed radian of the product, a bending driving unit that drives the front end regions of the two product support elastic pieces to expand outward to both sides and stick to the surface of the radian positioning unit, an end pressing unit that presses the end of the product to prevent warping during the cooling and shaping process, and a pressing device that presses the product above the product support elastic piece; a part of the product support elastic piece is fixed on a fixed mounting seat, and its front section is cantilevered outside; the bending driving unit includes a first cylinder, a connecting block that is driven by the first cylinder to perform horizontal linear motion, and connecting arms that are hinged on both sides of the connecting block and are respectively fixedly connected to the front ends of the two product support elastic pieces; the radian positioning unit includes a vertical plate, several screw rods arranged on the vertical plate and in threaded connection with the threaded holes on the vertical plate, and several radian adjusting blocks fixedly arranged at the ends of the screw rods.

2. The automatic hot bending and shaping device for a sealing strip according to claim 1, characterized in that: A scale is arranged on one side of the radian adjusting block along the adjusting direction of the radian adjusting block in a one-to-one correspondence manner.

3. The automatic hot bending and shaping device for a sealing strip according to claim 1, characterized in that: The radian adjusting block is locked on a bottom plate through a locking screw.

4. The automatic hot bending and shaping device for a sealing strip according to claim 1, characterized in that: The end pressing unit includes a second cylinder, a rod member that moves up and down under the drive of the second cylinder, and a pressing block fixed below the rod member and used to press the end of the product.

5. A method for hot bending and shaping a sealing strip, characterized in that: It includes the following steps: 1) Provide a radian positioning unit, and the radian positioning unit has an arc surface consistent with the designed radian of the sealing strip. 2) Fix the sealing strip on a product support elastic piece, and hot dry the section of the sealing strip that needs to be bent for a set time at a set temperature. 3) Drive the front end of the product support elastic piece to lean against the arc surface through a bending driving device, so that the product is bent into a designed radian state. 4) Continue hot drying for a set time for the second time. 5) Use an end pressing unit to press the end of the sealing strip, and then perform cooling to achieve final shaping.

6. The method for hot bending and shaping a sealing strip according to claim 5, characterized in that: The radian positioning unit includes a vertical plate, several screw rods arranged on the vertical plate and in threaded connection with the threaded holes on the vertical plate, and several radian adjusting blocks fixedly arranged at the ends of the screw rods. Adjust the positions of the radian adjusting blocks according to the designed radian of the seal, so that the arc surface formed by the same end surfaces of all the radian adjusting blocks is consistent with the designed radian of the sealing strip.

7. The method for hot bending and shaping a sealing strip according to claim 5, characterized in that: The bending driving unit includes a first cylinder, a connecting block that is driven by the first cylinder to perform horizontal linear motion on a slide rail, and connecting arms that are hinged on both sides of the connecting block and are respectively fixedly connected to the front ends of the two product support elastic pieces.

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