A method for demolding a skin textured bumper mold

Abstract

The present application belongs to the field of injection mold, and particularly relates to a demolding method of a skin pattern automobile bumper mold, the mold comprises a cavity part and a core part, and the cavity part and the core part are connected by an injection molded skin pattern automobile bumper, the core part comprises a core plate, a large top block is arranged on the core plate, the cavity part comprises a cavity frame, the end of the skin pattern automobile bumper is embedded in the cavity frame, the end of the skin pattern automobile bumper is provided with a side edge, an inclined top block is arranged in the core plate, the inclined top block is matched with the inner wall of the end of the skin pattern automobile bumper and the inner wall of the side edge, an outer push block is slidably arranged on the core plate, the outer push block is matched with the bottom surface of the end of the skin pattern automobile bumper and the outer wall of the side edge, when demolding, the inclined top block first leaves a deformation space, then the outer push block pushes the end of the skin pattern automobile bumper and the side edge to deform inwardly, so that the end of the skin pattern automobile bumper is demolded from the cavity frame.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of injection mold, in particular to a kind of automobile bumper mold demolding method with skin pattern. BACKGROUND

[0002] At present, automobile bumper mold mostly adopts inner parting demolding structure, and the inner parting demolding structure is mainly to set inner extraction mechanism on inclined ejector block, and when ejecting, the inclined ejector block is obliquely slid to drive the inner extraction mechanism to pull the end part (the largest profile part) of the bumper to deform, so that the end part of the bumper is demolded from the cavity of the mold. However, with the upgrading of products, the researchers develop a kind of automobile bumper with skin pattern on the surface, and the automobile bumper is flat as a whole, with small Z-direction difference and small height. If the traditional inner parting demolding structure is used, the demolding has the following difficulties: 1. Since the automobile bumper is flat, the Z-direction difference is small, and when the inner extraction mechanism pulls the bumper to deform inward, the resistance becomes large, that is, the inner extraction force is less than the deformation resistance, so the end part of the bumper cannot be deformed, and forcibly pulling the bumper can also easily cause the inner extraction mechanism to fall off from the end part of the bumper, and the deformation cannot be completed; 2. Even if the inner extraction force is greater than the deformation resistance, the surface skin pattern is also easily damaged, which affects the product quality. SUMMARY

[0003] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide a demolding method for automobile bumper mold with skin pattern, which uses an external pushing deformation method to make the end part of the bumper deform naturally and be smoothly demolded without damaging the surface skin pattern.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0005] A demolding method for automobile bumper mold with skin pattern, the mold comprises a cavity part and a core part, and there is an injection-molded automobile bumper with skin pattern between the cavity part and the core part. The core part comprises a core plate, and a large ejector block is arranged on the core plate. The cavity part comprises a cavity frame, and the end part of the automobile bumper with skin pattern is embedded in the cavity frame. The end part of the automobile bumper with skin pattern is provided with a side edge. An inclined ejector block is arranged in the core plate, and the inclined ejector block cooperates with the inner wall of the end part and the inner wall of the side edge of the automobile bumper with skin pattern. An external pushing block is slidably arranged on the core plate, and the external pushing block cooperates with the bottom surface of the end part and the outer wall of the side edge of the automobile bumper with skin pattern. When demolding, the core plate and the cavity frame are separated by the mold opening and closing mechanism, but under the action of the ejector mechanism, the automobile bumper with skin pattern remains in the cavity frame. The inclined ejector block slides inward under the reaction force of the core plate to leave a deformation space. Then, the external pushing block slides forward under the action of the external pushing mechanism to push the end part and the side edge of the automobile bumper with skin pattern to deform inward, so that the end part of the automobile bumper with skin pattern is demolded from the cavity frame.

[0006] Further, the mold opening and closing mechanism comprises a rotating connection pull rod on the ejection mechanism, a pull hook is arranged on the pull rod, a clamping block is arranged on the outer wall of the cavity frame, the pull hook is matched with the clamping block, rollers are arranged on the two side walls of the pull rod, guide blocks are arranged on the outer wall of the core plate, straight guide grooves and inclined guide grooves are arranged in the guide blocks, and the rollers are matched with the straight guide grooves and the inclined guide grooves.

[0007] Further, the ejection mechanism comprises an upper ejection plate and a lower ejection plate, a ejector pin is connected to the upper ejection plate, an ejection block is arranged on the ejector pin, and the ejection block is in contact with the back of the automobile bumper with a skin pattern; a straight ejection column is connected to the lower side of the large ejection block, and the straight ejection column is connected to the lower ejection plate; an inclined ejection rod is connected to the lower side of the inclined ejection block, an inclined sliding seat is arranged on the upper ejection plate, and the inclined ejection rod is connected to the inclined sliding seat in an inclined manner; a straight ejection rod is connected to the lower side of the outer push block, and the straight ejection rod is connected to the lower ejection plate; an ejection oil cylinder is arranged on the outer wall of the core plate, the oil cylinder rod of the ejection oil cylinder is connected to the lower ejection plate, and the pull rod is rotatably connected to the lower ejection plate through a connecting block.

[0008] Further, a T-shaped guide sliding strip is arranged on the straight ejection rod, a T-shaped guide sliding groove is arranged at the bottom of the outer push block, and the T-shaped guide sliding groove is matched with the T-shaped guide sliding strip.

[0009] Further, the outer push mechanism comprises an outer push fixed block arranged in the core plate, an outer push curved guide rail is arranged on the outer push fixed block, the outer push curved guide rail is connected to an outer push rod in a lateral sliding manner, and the outer push rod is connected to the outer push block.

[0010] Further, a lateral sliding groove is arranged on the outer push rod, and the lateral sliding groove is matched with the outer push curved guide rail in a sliding manner.

[0011] Further, a deformation prevention mechanism is arranged in the inclined ejection block, and the deformation prevention mechanism moves synchronously with the outer push mechanism.

[0012] Further, the deformation prevention mechanism comprises a deformation prevention insert block arranged in the inclined ejection block, the front end of the deformation prevention insert block is in contact with the along-edge inner wall, the rear end of the deformation prevention insert block is connected to a connecting rod, a deformation prevention fixed block is arranged in the core plate, a deformation prevention curved guide rail is arranged on the deformation prevention fixed block, a deformation prevention lateral sliding groove is arranged on the connecting rod, and the deformation prevention lateral sliding groove is matched with the deformation prevention curved guide rail.

[0013] The present application discloses a demolding method of a mold for an automobile bumper with a skin pattern, and has the following advantages compared with the prior art:

[0014] 1. The end part of the automobile bumper with a skin pattern is deformed by pushing from the outside, the whole outer push block acts on the outer wall of the end part of the automobile bumper with a skin pattern, the pushing force is larger, and it is particularly suitable for deforming the end part of a flat bumper with large deformation resistance, and the deformation is pushed from the outside, so that the accident of falling caused by pulling of the internal pulling mechanism does not occur, and the stability is better.

[0015] 2. The anti-deformation mechanism synchronizes with the outer pushing mechanism, which can effectively prevent deformation and prevent skin from being pulled to ensure product quality. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of a mold structure of a car bumper with skin;

[0017] Figure 2 is Figure 1 is a schematic diagram of a local enlargement at A of the car bumper with skin;

[0018] Figure 3 is a schematic diagram of an assembly relationship of the mold opening and closing mechanism of the present application;

[0019] Figure 4 is a schematic diagram of a cross-section of the ejection mechanism of the present application;

[0020] Figure 5 is a schematic diagram of an assembly relationship of the outer pushing mechanism and the anti-deformation mechanism of the present application;

[0021] Figure 6 is a schematic diagram of a cross-section of the outer pushing mechanism and the anti-deformation mechanism of the present application;

[0022] Figure 7 is a schematic diagram of an assembly relationship of the straight top rod and the outer pushing block of the present application;

[0023] Figure 8 is a schematic diagram of a three-dimensional car bumper mold with skin of the present application.

[0024] Markings in the figure: 1, core plate; 2, large top block; 5, cavity frame; 6, inclined top block; 7, outer pushing block; 8, ejector pin; 10, outer pushing fixed block; 11, outer pushing curved guide rail; 12, outer pushing rod; 13, lateral sliding groove; 20, upper top plate; 21, lower top plate; 22, straight top column; 23, inclined top rod; 24, inclined sliding seat; 25, straight top rod; 26, T-shaped guide sliding strip; 27, T-shaped guide sliding groove; 28, top block; 29, ejection oil cylinder; 30, anti-deformation insert block; 31, connecting rod; 32, anti-deformation fixed block; 33, anti-deformation curved guide rail; 34, anti-deformation lateral sliding groove; 50, pull rod; 51, pull hook; 52, clamping block; 53, roller; 54, guide block; 55, straight guide groove; 56, inclined guide groove; 57, connecting block, 01, cavity part; 02, core part; 03, car bumper with skin; 031, along the edge. DETAILED DESCRIPTION

[0025] The present application will be described in detail below in conjunction with specific implementation cases, which will help those skilled in the art to further understand the present application, but do not limit the present application in any form.

[0026] As Figure 1 —Figure 8 The present application relates to a kind of demolding methods of skin pattern automobile bumper mold, the mold includes cavity portion 01 and core portion 02 are constituted, there is the skin pattern automobile bumper 03 of injection molding between cavity portion 01 and core portion 02, the core portion 02 includes core plate 1, large top block 2 is arranged on the core plate, the cavity portion 01 includes cavity frame 5, the end of the skin pattern automobile bumper 03 is embedded in cavity frame 5, the end of the skin pattern automobile bumper 03 is equipped with along edge 031, oblique ejector pin 6 is arranged in the core plate 1, oblique ejector pin 6 cooperates with the end inner wall of the skin pattern automobile bumper 03 and the inner wall of along edge 031, outer push block 7 is slidably arranged on the core plate 1, and outer push block 7 cooperates with the end bottom surface of the skin pattern automobile bumper 03 and the outer wall of along edge 031, when demolding, core plate 1 is driven by opening and closing mold mechanism and is separated from cavity frame 5, but under the action of ejector mechanism, large top block 2, oblique ejector pin 6 and outer push block 7 are not moved first, so that the skin pattern automobile bumper 03 remains in cavity frame 5, at this time, the core side profile of the skin pattern automobile bumper 03 is demoulded, in this process, oblique ejector pin 6 moves inward under the reaction of core plate 1, and leaves deformation space, then continue to open mold, outer push block 7 is slid forward by outer push mechanism, so as to push the end of the skin pattern automobile bumper 03 and along edge 031 inwardly deformed, so that the end of the skin pattern automobile bumper 03 and the outer wall of along edge 031 are demoulded from cavity frame 5, and then continue to open mold, under the action of opening and closing mold mechanism, large top block 2, oblique ejector pin 6, outer push block 7 and the skin pattern automobile bumper 03 move away from cavity frame 5 following core plate 1, finally, the skin pattern automobile bumper 03 is ejected from the mold by ejector mechanism, and is taken away by worker or mechanical hand, and demolding is completed.

[0027] Further, the opening and closing mold mechanism includes rotatingly connecting pull rod 50 on ejector mechanism, pull hook 51 is arranged on pull rod 50, clamping block 52 is arranged on the outer wall of cavity frame 5, pull hook 51 cooperates with clamping block 52, roller 53 is arranged on the both sides of the outer wall of pull rod 50, guide block 54 is arranged on the outer wall of core plate 1, straight guide slot 55 and inclined guide slot 56 are arranged in guide block 54, and roller 53 cooperates with straight guide slot 55 and inclined guide slot 56. When opening mold, core plate 1 moves downward, and drives guide block 54 to move together, straight guide slot 55 in guide block 54 first cooperates with roller 53, at this time, pull hook 51 pulls clamping block 52, so as to pull the ejector mechanism not to move following core plate 1, i.e. large top block 2, oblique ejector pin 6 and outer push block 7 are not moved first by ejector mechanism, so that the skin pattern automobile bumper 03 remains in cavity frame 5, when roller 53 cooperates with inclined guide slot 56, since pull rod 50 is rotatingly connected, so as to drive pull rod 50 to rotate, so that pull hook 51 is separated from clamping block 52, at this time, the ejector mechanism moves following core plate 1, i.e. continue to open mold, under the action of opening and closing mold mechanism, large top block 2, oblique ejector pin 6, outer push block 7 and the skin pattern automobile bumper 03 move away from cavity frame 5 following core plate 1.

[0028] Further, the ejection mechanism includes an upper ejector plate 20 and a lower ejector plate 21, the upper ejector plate 20 is connected with the ejector pin 8, the ejector pin 8 is provided with a top block 28, the top block 28 is in contact with the back of the textured automobile bumper 03, the large top block 2 is connected with a straight ejector column 22, the straight ejector column 22 is connected with the lower ejector plate 21, the inclined top block 6 is connected with an inclined ejector rod 23, the lower ejector plate 21 is provided with an inclined sliding seat 24, the inclined ejector rod 23 is connected with the inclined sliding seat 24 in an inclined manner, the outer push block 7 is connected with a straight ejector rod 25, the straight ejector rod 25 is connected with the lower ejector plate 21, the oil cylinder rod of the ejection oil cylinder 29 is connected with the lower ejector plate 21, and the pull rod 50 is rotatably connected to the lower ejector plate 21 through the connecting block 57. During the downward movement of the core plate 1, the pull hook 51 on the pull rod 50 first pulls the clamping block 52, so that the lower ejector plate 21 does not move, but the inclined top block 6 slides inward under the reaction force of the downward movement of the core plate 1 through the cooperation of the inclined ejector rod and the inclined sliding seat, while the large top block 2 and the outer push block 7 remain stationary first, and the outer push block 7 is separated from the core plate 1, which facilitates the forward sliding of the outer push mechanism in the subsequent process.

[0029] Further, the straight ejector rod 25 is provided with a T-shaped guide sliding strip 26, the bottom of the outer push block 7 is provided with a T-shaped guide sliding groove 27, the T-shaped guide sliding groove 27 cooperates with the T-shaped guide sliding strip 26, and the sliding is more accurate and smooth.

[0030] Further, the outer push mechanism includes an outer push fixed block 10 arranged in the core plate 1, an outer push curved guide rail 11 arranged on the outer push fixed block, an outer push rod 12 slidably connected to the outer push curved guide rail 11, and the outer push rod 12 connected with the outer push block 7. During the downward movement of the core plate 1, the outer push fixed block 10 always moves, the outer push curved guide rail 11 moves along, so that the outer push rod 12 moves along the track of the outer push curved guide rail 11, that is, the Z-direction of the outer push rod 12 does not move, and the X-direction moves, so as to realize the forward pushing or backward movement of the outer push block 7 driven by the outer push rod 12.

[0031] Further, the outer push rod 12 is provided with a lateral sliding groove 13, the lateral sliding groove 13 cooperates with the outer push curved guide rail 11 in sliding, and with the lateral sliding groove 13, the sliding cooperation of the outer push rod 12 and the outer push curved guide rail 11 is more convenient.

[0032] Further, a deformation prevention mechanism is arranged in the inclined top block 6, the deformation prevention mechanism moves synchronously with the outer push mechanism, and the deformation prevention mechanism can effectively prevent the end of the textured automobile bumper 03 and the edge 031 from being deformed inward.

[0033] Further, the anti-deformation mechanism comprises an anti-deformation insert 30 arranged in the inclined ejector block 6, the front end of the anti-deformation insert 30 being in contact with the inner wall of the flange 031, and the rear end of the anti-deformation insert 30 being connected with a connecting rod 31, the core plate 1 being provided with an anti-deformation fixed block 32, the anti-deformation fixed block 32 being provided with an anti-deformation curved guide rail 33, the connecting rod 31 being provided with an anti-deformation lateral sliding groove 34, the anti-deformation lateral sliding groove 34 being matched with the anti-deformation curved guide rail 33, the anti-deformation mechanism being operated synchronously with the outer pushing mechanism, and the front end of the anti-deformation insert 30 being always in contact with the inner wall of the flange 031, so as to effectively prevent the product from being pulled and the skin from being damaged due to the transition deformation.

[0034] The above specific embodiments are used to explain and illustrate the present application, rather than limiting the present application, and any modification and change made to the present application within the spirit and protection scope of the claims of the present application shall fall into the protection scope of the present application.

Claims

1. A demolding method for a car bumper mold with a leather-textured finish, characterized in that: The mold comprises a cavity part (01) and a core part (02). A textured car bumper (03) is injection-molded between the cavity part (01) and the core part (02). The core part (02) includes a core plate (1) with a large top block (2) on it. The cavity part (01) includes a cavity frame (5). The end of the textured car bumper (03) is embedded in the cavity frame (5). An edge (031) is provided below the end of the textured car bumper (03). An inclined top block (6) is provided in the core plate (1). The inclined top block (6) cooperates with the inner wall of the end of the textured car bumper (03) and the inner wall of the edge (031). An outer push block (7) is slidably set on the core plate (1). The outer push block (7) cooperates with the bottom surface of the end of the textured car bumper (03) and the outer wall of the edge (031). When demolding, the core plate (1) is driven to separate from the cavity frame (5) by the mold opening and closing mechanism. However, under the action of the ejection mechanism, the textured car bumper (03) remains in the cavity frame (5). The inclined ejector block (6) slides inward under the reaction force of the core plate (1) to make room for deformation. Then, the outer push block (7) slides forward under the action of the outer push mechanism, pushing the end of the textured car bumper (03) and the edge (031) to deform inward, so that the end of the textured car bumper (03) is removed from the cavity frame (5). The mold opening and closing mechanism includes a rotatably connected pull rod (50) on the ejection mechanism, a pull hook (51) on the pull rod (50), a locking block (52) on the outer wall of the cavity frame (5), the pull hook (51) cooperating with the locking block (52), rollers (53) on both sides of the outer wall of the pull rod (50), and a guide block (54) on the outer wall of the core plate (1). The guide block (54) has a straight guide groove (55) and an inclined guide groove (56). The rollers (53) cooperate with the straight guide groove (55) and the inclined guide groove (56). The ejection mechanism includes an upper top plate (20) and a lower top plate (21). An ejector pin (8) is connected to the upper top plate (20), and an ejector block (28) is provided on the ejector pin (8). The top block (28) contacts the back of the leather-textured car bumper (03). The large top block (2) is connected to the straight top column (22), which is connected to the lower top plate (21). The inclined top block (6) is connected to the inclined top rod (23). An inclined slide (24) is provided on the lower top plate (21). The inclined top rod (23) is connected to the inclined slide (24) at an angle. The outer push block (7) is connected to the straight top rod (25), which is connected to the lower top plate (21). The core plate (1) is provided with an ejector cylinder (29). The cylinder rod of the ejector cylinder (29) is connected to the lower top plate (21). The pull rod (50) is rotatably connected to the lower top plate (21) through the connecting block (57).

2. The demolding method for a textured car bumper mold as described in claim 1, characterized in that... The straight push rod (25) is provided with a T-shaped guide slide (26), and the bottom of the push block (7) is provided with a T-shaped guide groove (27), which cooperates with the T-shaped guide slide (26).

3. The demolding method for a textured car bumper mold as described in claim 1, characterized in that... The push mechanism includes a push fixing block (10) set in the core plate (1), a push curved guide rail (11) set on the push fixing block, a push rod (12) slidably connected to the push curved guide rail, and the push rod connected to the push block (7).

4. The demolding method for a textured car bumper mold as described in claim 3, characterized in that... The outer push rod (12) is provided with a lateral sliding groove (13), which slides in conjunction with the outer push curve guide rail (11).

5. The demolding method for a textured car bumper mold as described in claim 1, characterized in that... The inclined block (6) is provided with an anti-deformation mechanism, which moves synchronously with the push mechanism.

6. The demolding method for a textured car bumper mold as described in claim 5, characterized in that... The anti-deformation mechanism includes an anti-deformation insert (30) in the inclined top block (6), the front end of the anti-deformation insert (30) is in contact with the inner wall of the edge (031), the rear end of the anti-deformation insert (30) is connected to the connecting rod (31), an anti-deformation fixing block (32) is provided in the core plate (1), an anti-deformation curved guide rail (33) is provided on the anti-deformation fixing block (32), and an anti-deformation lateral sliding groove (34) is provided on the connecting rod (31), the anti-deformation lateral sliding groove (34) cooperates with the anti-deformation curved guide rail (33).

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