Delayed demolding structure of automobile front end frame

Abstract

The utility model relates to a delayed demoulding structure of an automobile front end frame, which comprises a lower mould plate, a lower mould frame, an upper mould frame and an upper mould plate which are sequentially overlapped, and an upper mould core and a lower mould core are closed to form a cavity during mould closing; an upper mold core and a lower mold core which are used for forming the front end frame of the automobile are arranged in the cavity; an injection molding cavity is formed when the upper mold core and the lower mold core are closed, and a core pulling assembly is arranged in the injection molding cavity and used for forming an inverted buckle structure on an automobile front end frame; the core pulling assembly comprises a sliding block driven by an oil cylinder, a delayed demolding mechanism is arranged on the sliding block, and the output end of the delayed demolding mechanism abuts against the formed automobile front end frame. Compared with the prior art, the delayed demoulding device has the beneficial effects that the slider is sequentially driven to move through the combination of the inclined guide pillar and the oil cylinder to demould an inverted part in a delayed manner, so that the length of the inclined guide pillar can be shortened, the inverted part can be demoulded completely, and the strain of the inverted part is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to a delayed demoulding structure of a front end frame of an automobile. Background Art

[0002] The structure of the front-end frame of an automobile is complex and is usually provided with multiple rib positions, which require sliders for demolding. The rib positions of the automobile front-end frame product are all on the sliders, and the product is wrapped in the sliders. In the actual production process, the rib positions will stick to the sliders. That is, during the demolding process of the injection molded part, the rib positions will adhere to the sliders, causing the entire automobile front-end frame product to move with the sliders, and thus making it impossible for the injection molded part to be completely ejected; if only inclined guide pillars are used to drive the slider to move, the inclined guide pillars will be too long and easy to break. Utility Model Content

[0003] In order to solve the above problems existing in the prior art, the utility model provides a delayed demoulding structure for a front-end frame of an automobile.

[0004] The above-mentioned problem of the present invention is solved by the following technical solutions:

[0005] A delayed demoulding structure for a front-end frame of an automobile comprises a lower mold plate, a lower mold frame, an upper mold frame, and an upper mold plate, which are sequentially stacked. When the molds are closed, the upper mold core and the lower mold core are closed to form a cavity; the upper mold core and the lower mold core for molding the front-end frame of the automobile are arranged in the cavity;

[0006] When the upper mold core and the lower mold core are closed, an injection cavity is formed, and a core pulling assembly is provided in the injection cavity for forming an undercut structure on the front end frame of the automobile;

[0007] The core pulling assembly includes a slider driven by an oil cylinder, and the slider is provided with a delayed demoulding mechanism, and the output end of the delayed demoulding mechanism is supported on the formed front end frame of the automobile;

[0008] During the mold opening process, the slider has two moving strokes:

[0009] In the first stroke, the upper and lower molds open, driving the slider to exit. At this time, the output end of the delayed demoulding mechanism is still supported on the front frame of the car.

[0010] In the second stroke, the mold is fully opened, the oil cylinder drives the slider to continue to withdraw, and drives the output end of the delayed demoulding mechanism to separate from the front end frame of the car.

[0011] The above technical solution is further configured as follows: the delayed demoulding mechanism includes an elastic needle assembly penetrating the slider, and the output end is an end of the elastic needle assembly extending outside the slider;

[0012] The cavity is provided with a holding area and a demoulding area which are in contact with the holding end of the elastic needle assembly and correspond to the first stroke and the second stroke.

[0013] The above technical solution is further configured as follows: the holding area is a vertical plane, and the demoulding area is an inclined surface connected below the holding area.

[0014] The above technical solution is further configured as follows: the slider is provided with an elastic needle channel capable of accommodating the movement of the elastic needle assembly, and the inner wall of the upper mold frame is provided with a wear-resistant sheet to seal the end of the elastic needle channel;

[0015] The holding area and the demoulding area are located on the wear-resistant plate.

[0016] The above technical solution is further configured as follows: the elastic needle assembly includes a push rod and an elastic component arranged at the tail of the push rod;

[0017] The output end is the head end of the push rod, and the holding end is the tail end of the push rod;

[0018] The elastic component supports the push rod so that the push rod has a tendency to move toward a side away from the front end frame of the automobile.

[0019] The above technical solution is further configured as follows: the elastic component is a spring, and is sleeved on the tail of the push rod;

[0020] The push rod is provided with a support ring for the spring to support.

[0021] The above technical solution is further configured as follows: the elastic needle assembly further includes a guide block; the tail of the ejector rod passes through the guide block;

[0022] The elastic needle channel is provided with an adjustment groove capable of accommodating the guide block and the elastic component.

[0023] The above technical solution is further configured as follows: a driving groove connected to the oil cylinder is provided on the slider; and an output shaft of the oil cylinder is connected to the driving groove to pull the slider.

[0024] The above technical solution is further configured as follows: a driving block is provided in the driving slot, and the output end is connected to the driving block;

[0025] The length of the driving block along the moving direction is smaller than the width of the driving slot in the moving direction.

[0026] The above technical solution is further configured as follows: the upper die core drives the slider to move via an inclined guide column.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. The combination of the inclined guide column and the oil cylinder drives the slider to move in sequence to delay the demoulding of the undercut part. This can shorten the length of the inclined guide column and at the same time completely demould the undercut part, reducing the damage to the undercut part.

[0029] 2. Set the wear-resistant sheet to contact the elastic needle structure to reduce wear and ensure the service life of the delayed demoulding mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the cross-sectional structure of the present utility model.

[0031] Figure 2 It is a schematic diagram of the cross-sectional structure of the core pulling assembly in the first stroke state.

[0032] Figure 3 It is a schematic diagram of the cross-sectional structure of the core pulling assembly in the second stroke state.

[0033] Figure 4 for Figure 1 Schematic diagram of the enlarged structure of part A in the middle.

[0034] Figure 5 for Figure 3 Schematic diagram of the enlarged structure of part B in the middle.

[0035] Figure 6 It is a structural diagram of the core pulling component and product.

[0036] Figure 7 Schematic diagram of the structure of the wear-resistant plate.

[0037] Figure 8 Schematic diagram of the cross-sectional structure inside the slider.

[0038] Figure 9 Schematic diagram of the structure of the bottom of the slider.

[0039] The following are marked: 100, lower mold plate; 200, lower mold frame; 300, upper mold plate; 400, upper mold frame; 500, lower mold core; 600, upper mold core;

[0040] 700, core pulling assembly; 710, slider; 712, drive slot; 711, spring needle channel; 713, adjustment slot; 720, spring needle assembly; 721, ejector rod; 721.1, top holding ring; 722, elastic component; 730, wear-resistant sheet; 723, guide block;

[0041] 800, automobile front end frame;

[0042] 1. Die foot; 2. Ejector plate; 3. Ejector; 4. Cylinder; 4.1. Output shaft; 5. Drive block; 6. Inclined guide pin; 7. Guide pin drive block; 6.1. Notch;

[0043] a. Holding area; b. Demolding area. DETAILED DESCRIPTION

[0044] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the following is a detailed description of the specific implementation method, structure, characteristics and effects of the present invention in combination with the accompanying drawings and preferred embodiments.

[0045] like Figures 1-9 As shown, this embodiment discloses a delayed demoulding structure for a front-end frame of an automobile.

[0046] A delayed demoulding structure for a front-end frame of an automobile comprises a lower mold plate 100, a lower mold frame 200, an upper mold frame 400, and an upper mold plate 300, which are stacked in sequence. When the molds are closed, an upper mold core 600 and a lower mold core 500 are closed to form a cavity. The upper mold core 600 and the lower mold core 500 are disposed in the cavity for molding the front-end frame 800 of the automobile.

[0047] The upper mold core 600 and the lower mold core 500 form an injection cavity when the mold is closed. A core pulling assembly 700 is provided in the injection cavity for molding the undercut structure on the front end frame 800 of the automobile.

[0048] The core pulling assembly 700 includes a slider 710 driven by the oil cylinder 4. The slider 710 is provided with a delayed demoulding mechanism. The output end of the delayed demoulding mechanism is supported on the formed automobile front end frame 800.

[0049] During the mold opening process, the slider 710 has two moving strokes:

[0050] In the first stroke, the upper mold core 600 and the lower mold core 500 open the mold, driving the slider 710 to withdraw. At this time, the output end of the delayed demoulding mechanism is still supported on the front frame 800 of the automobile.

[0051] In the second stroke, the mold is completely opened, the oil cylinder 4 drives the slider 710 to continue to withdraw, and drives the output end of the delayed demoulding mechanism to separate from the front end frame 800 of the automobile.

[0052] The above is the basic solution of this embodiment.

[0053] Specific reference Figure 1 As shown, a mold foot 1 is provided between the lower mold plate 100 and the lower mold frame 200, and the mold foot 1 separates the lower mold plate 100 and the lower mold frame 200, and an ejector pin 3 plate 2 is provided between the two mold feet 1, and the ejector pin 3 ejects the product during the mold opening process;

[0054] The upper mold plate 300 is provided with an injection port which is connected to the runner in the upper mold frame 400, and the injection plastic is injected into the injection cavity to form the automobile front end frame 800;

[0055] The specific structure and usage of the mold are consistent with the mold in the prior art and will not be described in detail here.

[0056] In this embodiment, the undercut structure on the front end frame 800 of the automobile is set on the side, and the core pulling assembly 700 extends into the injection cavity from the side and exits from the side to separate from the front end frame 800 of the automobile, thereby demolding the product;

[0057] In the first stroke, the upper mold plate 300, the upper mold frame 400 and the upper mold core 600 are integrated and separated from the lower mold core 500, the lower mold frame 200 and the lower mold plate 100. At this time, the product is only wrapped on the slider 710.

[0058] Specific reference Figure 2 As shown, at this time, the delayed demoulding mechanism still holds the undercut structure on the front end frame 800 of the automobile, and the slider 710 withdraws from the product;

[0059] In the second stroke, the mold is fully opened. At the same time, the oil cylinder 4 drives the slider 710 to continue to withdraw from the injection cavity. During this withdrawal process, the delayed demoulding mechanism is separated from the undercut structure on the front end frame 800 of the automobile, and the core pulling assembly 700 and the front end frame 800 of the automobile are completely separated. For details, refer to Figure 3 shown.

[0060] Specifically, in this embodiment, the delayed demoulding mechanism includes an elastic needle assembly 720 that passes through the slider 710, and the output end is an end of the elastic needle assembly 720 that extends outside the slider 710;

[0061] The cavity is provided with a holding area a and a demoulding area b which are in contact with the holding end of the elastic needle assembly 720 and correspond to the first stroke and the second stroke.

[0062] Specific reference Figure 4 As shown, the spring needle assembly 720 passes through the slider 710, and the output end abuts against the undercut portion of the front end frame 800 of the automobile, and the holding end abuts against the inner wall of the cavity;

[0063] The portion of the inner wall of the cavity that contacts the spring pin assembly 720 is provided with a demolding area b and a holding area a along the mold opening direction. When the mold is opened, the demolding area b and the holding area a move with the upper mold frame 400 toward a side away from the lower mold frame 200.

[0064] Reference Figure 4 As shown, in the first stroke, the holding end is always in contact with the holding area a and slides relative to the holding area a, and the sliding direction is opposite to the mold opening direction of the upper mold frame 400;

[0065] Reference Figure 5As shown, in the second stroke, the holding end contacts the demolding area b and slides relative to the demolding area b. The sliding direction is opposite to the mold opening direction of the upper mold frame 400. At the same time, the spring needle assembly 720 moves along the exit direction of the slider 710, so that the output end is disengaged from the undercut part.

[0066] Preferably, in this embodiment, the holding area a is a vertical plane, and the demoulding area b is an inclined surface connected below the holding area a.

[0067] In this embodiment, the upward movement of the upper mold frame 400 is the mold opening direction. When the upper mold frame 400 moves, the inner wall of the cavity on the upper mold frame 400 also moves upward. Therefore, the holding area a also moves upward in the vertical direction. The holding area a does not move horizontally. Therefore, the holding end of the spring pin assembly 720 only moves linearly in the vertical direction relative to the holding area a. In other words, the spring pin assembly 720 does not move at all and is still held on the undercut part.

[0068] In the second stroke, the top holding end of the elastic needle assembly 720 contacts the demolding area b. Since the demolding area b is an inclined surface, when the demolding area b moves upward with the upper mold frame 400, the top holding position of the elastic needle assembly 720 on the demolding area b changes in the horizontal direction. That is to say, the top holding position moves outward, and the top holding end of the elastic needle assembly 720 is always in contact with the demolding area b, so it also moves outward, thereby separating the output end from the undercut part.

[0069] When the mold is opened, relative sliding occurs between the inner wall of the upper mold frame 400 and the elastic needle assembly 720, which causes wear on the inner wall, thereby causing deformation of the injection cavity and resulting in defective molded products. Therefore, in this embodiment, the slider 710 is provided with an elastic needle channel 711 capable of accommodating the movement of the elastic needle assembly 720, and a wear-resistant sheet 730 is provided on the inner wall of the upper mold frame 400 to seal the end of the elastic needle channel 711;

[0070] The holding area a and the demoulding area b are located on the wear-resistant plate 730 .

[0071] Specific reference Figure 6-Figure 8 As shown, the wear-resistant sheet 730 is fixed to the inner wall of the upper mold frame 400. When the mold is closed, the wear-resistant sheet 730 is tightly attached to the slider 710 and blocks one end of the elastic needle channel 711 on the slider 710. The supporting area a is located on the side connected to the elastic needle channel 711.

[0072] The holding area a is a groove concavely arranged on the wear-resistant plate 730, and the bottom of the groove is set as a vertical surface, that is, the holding area a; the holding end of the elastic needle assembly 720 extends into the groove and contacts the bottom of the groove.

[0073] The inner wall of the cavity is set as an inclined surface, and the wear-resistant sheet 730 is also fixed in an inclined state on the inner wall of the upper mold frame 400. When the upper mold frame 400 moves upward in the vertical direction to open the mold, the wear-resistant sheet 730 also moves upward.

[0074] In this embodiment, the demolding area b is the surface of the wear-resistant sheet 730 located below the groove; after the wear-resistant sheet 730 moves upward a certain distance, the groove and the elastic needle channel 711 are misaligned, and the groove is located above the elastic needle channel 711. At this time, the surface of the wear-resistant sheet 730 is located at the position corresponding to the elastic needle channel 711, and the elastic needle channel 711 is still blocked. At this time, the top holding end of the elastic needle assembly 720 contacts the surface of the wear-resistant sheet 730, that is, contacts the demolding area b.

[0075] In this embodiment, the specific implementation of the elastic needle assembly 720 is as follows: the elastic needle assembly 720 includes a push rod 721 and an elastic component 722 provided at the tail end of the push rod 721;

[0076] The output end is the head end of the push rod 721, and the holding end is the tail end of the push rod 721;

[0077] The elastic component 722 supports the push rod 721 so that the push rod 721 tends to move toward a side away from the front end frame 800 of the automobile.

[0078] Preferably, the elastic component 722 is a spring and is sleeved on the tail of the push rod 721;

[0079] The push rod 721 is provided with a support ring 721.1 for supporting the spring.

[0080] Specific reference Figure 4 or Figure 5 As shown, the head end of the push rod 721 extends outside the slider 710, and its shape is consistent with the undercut portion on the front frame 800 of the automobile; the tail end is located inside the slider 710 or extends outside the slider 710 to contact the wear-resistant plate 730, and the wear-resistant plate 730 supports the tail end;

[0081] The spring is sleeved at the tail of the push rod 721 and close to the tail end, and the top holding ring 721.1 is located at the rear side of the spring;

[0082] The spring supports the supporting ring 721.1, so that the push rod 721 is also supported by the spring and has a tendency to move backward, ensuring that the tail end of the push rod 721 is always in contact with the wear-resistant plate 730, so as to realize the control of the state of the push rod 721 through the supporting area a and the demoulding area b on the wear-resistant plate 730.

[0083] In this embodiment, the top holding ring 721 . 1 is a convex ring formed on the outer periphery of the top rod 721 .

[0084] In this embodiment, in order to ensure the position of the spring and the stability of the ejector rod 721 during movement, the ejector pin assembly 720 further includes a guide block 723; the tail of the ejector rod 721 passes through the guide block 723;

[0085] The elastic pin channel 711 is provided with an adjustment slot 713 capable of accommodating the guide block 723 and the elastic component 722 .

[0086] The inner diameter of the adjustment groove 713 is larger than the inner diameter of the elastic needle channel 711 and is arranged at the tail end of the elastic needle channel 711;

[0087] The spring is located in the adjustment groove 713, and the front end is supported on the front end wall of the adjustment groove 713;

[0088] The guide block 723 is located at the tail of the push rod 721 , limits and guides the position of the tail of the push rod 721 , and contacts the surface of the wear-resistant sheet 730 at the same time.

[0089] In order to cooperate with the two strokes of the slider 710, in this embodiment, the slider 710 is provided with a driving groove 712 connected to the cylinder 4; the output shaft 4.1 of the cylinder 4 is connected to the driving groove 712 to pull the slider 710.

[0090] Preferably, refer to Figure 9 As described, the driving groove 712 is set at the bottom of the slider 710, and the output shaft 4.1 of the cylinder 4 is limitedly set in the driving groove 712. When the output shaft 4.1 retracts, the slider 710 is pulled to move toward one side of the cylinder 4.

[0091] The driving block 5 is provided in the driving slot 712, and the output end is connected to the driving block 5;

[0092] The length of the driving block 5 along the moving direction is smaller than the width of the driving slot 712 in the direction.

[0093] In the first stroke, the upper mold core 600 drives the slider 710 to move when the mold is opened, and the cylinder 4 is not started. Therefore, the driving groove 712 moves relative to the driving block 5 as the slider 710 withdraws. The driving block 5 has an idle stroke at one end in the driving groove 712 until the rear end surface of the driving block 5 contacts the driving groove 712. The slider 710 and the driving block 5 are limited, and the slider 710 cannot continue to withdraw. For details, refer to Figure 9 As shown;

[0094] In the second stroke, the oil cylinder 4 is started, and the output shaft 4.1 pulls the driving groove 712 through the driving block 5, so that the slider 710 continues to withdraw outward until the demoulding is completed.

[0095] In this embodiment, the upper mold core 600 drives the slider 710 to move via the inclined guide pillar 6 .

[0096] Specific reference Figure 6 As shown, the oblique guide pillar 6 is provided on the upper mold core 600 and the slider 710, and a guide pillar driving block 75 is provided on the lower end surface of the upper mold core 600 to cooperate with the notch 6.1 on the oblique guide pillar 6;

[0097] When the mold is opened, the upper mold core 600 drives the guide column driving block 75 to move upward, and the guide column driving block 75 pulls the inclined guide column 6 upward through the slot 6.1, so that the inclined guide column 6 also moves upward. In the process of the inclined guide column 6 moving upward, due to its inclined state, a certain point therein also produces a displacement in the horizontal direction, thereby driving the slider 710 to move outward, so that the vertical movement of the upper mold core 600 is converted into a horizontal drive of the slider 710.

[0098] The structure of driving the slider 710 by the inclined guide pillar 6 in this embodiment is consistent with the inclined guide pillar driving structure in the prior art, and will not be described in detail here.

[0099] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A delayed demoulding structure for a front-end frame of an automobile, comprising a lower mold plate (100), a lower mold frame (200), an upper mold frame (400), and an upper mold plate (300) which are sequentially stacked. When the molds are closed, the upper mold core (600) and the lower mold core (500) are closed to form a mold cavity; the upper mold core (600) and the lower mold core (500) for molding the front-end frame (800) of the automobile are arranged in the mold cavity; Its characteristics are: When the upper mold core (600) and the lower mold core (500) are closed together, an injection cavity is formed, wherein a core pulling assembly (700) is provided in the injection cavity for molding an undercut structure on a front end frame (800) of an automobile; The core pulling assembly (700) includes a slider (710) driven by an oil cylinder (4), the slider (710) being provided with a delayed demoulding mechanism, the output end of the delayed demoulding mechanism being supported on the formed automobile front end frame (800); During the mold opening process, the slider (710) has two moving strokes: In the first stroke, the upper mold core (600) and the lower mold core (500) open the mold, driving the slider (710) to exit, and at this time, the output end of the delayed demoulding mechanism is still supported on the front frame (800) of the automobile; In the second stroke, the mold is completely opened, the oil cylinder (4) drives the slider (710) to continue to withdraw, and drives the output end of the delayed demoulding mechanism to separate from the automobile front end frame (800).

2. The delayed demoulding structure of the automobile front end frame according to claim 1, characterized in that: The delayed demoulding mechanism comprises an elastic needle assembly (720) penetrating the slider (710), and the output end is an end of the elastic needle assembly (720) extending outside the slider (710); The cavity is provided with a holding area (a) and a demoulding area (b) which are in contact with the holding end of the elastic needle assembly (720) and correspond to the first stroke and the second stroke.

3. The delayed demoulding structure of the automobile front end frame according to claim 2, characterized in that: The holding area (a) is a vertical plane, and the demoulding area (b) is an inclined surface connected to the bottom of the holding area (a).

4. The delayed demoulding structure of the automobile front end frame according to claim 2, characterized in that: The slider (710) is provided with an elastic needle channel (711) capable of accommodating the movement of the elastic needle assembly (720), and a wear-resistant sheet (730) is provided on the inner wall of the upper mold frame (400) to seal the end of the elastic needle channel (711); The holding area (a) and the demoulding area (b) are located on the wear-resistant plate (730).

5. The delayed demoulding structure of the automobile front end frame according to claim 4, characterized in that: The elastic needle assembly (720) includes a push rod (721) and an elastic component (722) arranged at the tail of the push rod (721); The output end is the head end of the push rod (721), and the holding end is the tail end of the push rod (721); The elastic component (722) supports the push rod (721), so that the push rod (721) has a tendency to move toward a side away from the front end frame (800) of the automobile.

6. The delayed demoulding structure of the automobile front end frame according to claim 5, characterized in that: The elastic component (722) is a spring and is sleeved on the tail of the push rod (721); The push rod (721) is provided with a support ring (721.1) for supporting the spring.

7. The delayed demoulding structure of the automobile front end frame according to claim 5 or 6, characterized in that: The elastic needle assembly (720) further includes a guide block (723); the tail of the ejector rod (721) passes through the guide block (723); The elastic needle channel (711) is provided with an adjustment groove (713) capable of accommodating the guide block (723) and the elastic component (722).

8. The delayed demoulding structure of the automobile front end frame according to claim 1, characterized in that: The slider (710) is provided with a driving groove (712) connected to the oil cylinder (4); the output shaft (4.1) of the oil cylinder (4) is connected to the driving groove (712) to pull the slider (710).

9. The delayed demoulding structure of the automobile front end frame according to claim 8, characterized in that: A driving block (5) is provided in the driving slot (712), and the output end is connected to the driving block (5); The length of the driving block (5) along the moving direction is smaller than the slot width of the driving slot (712) in the direction.

10. The delayed demoulding structure of the automobile front end frame according to claim 1, characterized in that: The upper die core (600) drives the slider (710) to move via the inclined guide pillar (6).

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