Multi-material injection molding process for automobile outer rear cover

Abstract

The invention relates to the technical field of automobile outer rear cover injection molding, in particular to an automobile outer rear cover multi-material injection molding technology which comprises a bottom plate, a lower mold assembly and an upper mold assembly, the upper mold assembly comprises an upper mold plate and a lower mold base, an upper mold cavity is formed in the lower mold base, and a mixing barrel is installed above the upper mold plate; a barrel cover is detachably mounted at the top end of the mixing barrel, a plurality of L-shaped material guiding barrels are mounted at the top end of the barrel cover, a push ring is transversely arranged on the horizontal part of each L-shaped material guiding barrel in a sliding and penetrating manner, a plurality of inclined material guiding barrels are mounted at the bottom end of the mixing barrel, and a circulating ring is rotationally arranged in each inclined material guiding barrel. After injection molding is finished, connection of the sprues in the vertical runners is cut off by changing the transverse positions of the cutters, that is, adhesion between the sprues in the vertical runners and the molded outer plates of the left and right rear wheel covers of the automobile is cut off, and subsequent demolding treatment of the outer plate plastic parts of the left and right rear wheel covers of the automobile is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding of an automobile outer rear cover, and in particular to a multi-material injection molding process of an automobile outer rear cover. Background Art

[0002] The left and right rear wheel cover outer panels of a car are an important part of the side panel assembly. They are an indispensable part of the car body side panel. They are located at the rear wheel cover of the car body and are used for the driver to compare the distance between the car body and external objects while driving and to seal the car body. In order to improve the overall strength of the left and right rear wheel cover outer panels of the car, a multi-material mixed injection molding process is generally used.

[0003] In the existing multi-material injection molding equipment for automobile rear cover, there is generally only one feed channel leading to the mixing barrel, so the multiple raw materials need to be pre-mixed in proportion in advance, but this method is prone to cause blockage of the feed channel; and the mixed multiple raw materials often only flow into the injection molding cavity through a single channel. Due to the complex shapes of the left and right rear wheel cover outer panels of the automobile, the feed of a single channel is prone to uneven distribution; and the improved multi-channel feed channel will bring multiple gates, causing the left and right rear wheel cover outer panels of the automobile to stick to the multiple gates after molding, making subsequent demolding difficult.

[0004] Therefore, it is necessary to invent a multi-material injection molding process for an automobile outer rear cover to solve the above problems. Summary of the invention

[0005] In order to address the deficiencies of the prior art, the purpose of the present invention is to provide a multi-material injection molding process for an automobile outer rear cover, which solves the problem that in the prior art there is only one feed channel leading to a mixing barrel, so that multiple raw materials need to be pre-mixed in proportion in advance, but this method is likely to cause blockage of the feed channel; and the mixed multiple raw materials often only flow into the injection molding cavity through a single channel. Due to the complex shapes of the left and right rear wheel cover outer panels of the automobile, the feed of a single channel is prone to uneven distribution; and the improved design of the multi-channel feed channel will bring multiple gates, resulting in adhesion between the molded left and right rear wheel cover outer panels of the automobile and the multiple gates, making subsequent demolding difficult.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: A multi-material injection molding process for an automobile rear cover, comprising a bottom plate, a lower mold assembly arranged above the bottom plate, and an upper mold assembly longitudinally slidably arranged above the lower mold assembly, wherein the upper mold assembly comprises an upper mold plate and a lower mold seat arranged below the upper mold plate, wherein an upper mold cavity is provided in the lower mold seat, wherein a mixing cylinder capable of stirring and mixing multiple raw materials is installed above the upper mold plate, wherein a cylinder cover is detachably installed at the top of the mixing cylinder, wherein a plurality of L-shaped guides capable of conveying raw materials required for injection molding into the mixing cylinder are installed at the top of the cylinder cover Cylinder, the horizontal part of each of the L-shaped material guide cylinders is slidably penetrated by a push ring for pushing the raw materials into the mixing cylinder, a plurality of inclined material guide cylinders are installed at the bottom end of the mixing cylinder, and a circulation ring for controlling the circulation of the inclined material guide cylinder is rotatably arranged in each of the inclined material guide cylinders, and vertical flow channels that can be connected to the upper mold cavity are opened at the positions of the upper mold plate and the upper mold seat that are adapted to the inclined material guide cylinders, and a cutter that can cut off the adhesion of the gate in the vertical flow channel is slidably arranged at the position of each vertical flow channel in the upper mold seat.

[0007] As a preferred solution of the present invention, a transverse slide groove is transversely opened at the position where each vertical flow channel is adapted on the peripheral side wall of the upper mold base, and a cutting groove is commonly opened on the connecting part of the vertical flow channel and the transverse slide groove. A lower support frame is installed on the peripheral side wall of the upper mold base, and a lower telescopic frame is installed on the end of the lower support frame. A slide plate that can slide transversely along the transverse slide groove is installed on the end of the lower telescopic frame, and the cutter is detachably installed on the other end of the slide plate.

[0008] As a preferred solution of the present invention, the cross-sectional dimension of the slide plate is consistent with the cross-sectional dimension of the transverse slide groove, and the cross-sectional dimension of the cutter is consistent with the cross-sectional dimension of the cutting groove.

[0009] As a preferred solution of the present invention, a mounting seat is provided at the top of the barrel cover, a driving member is installed in the mounting seat, a rotating shaft that can longitudinally penetrate the barrel cover and extend into the mixing barrel is installed at the output end of the driving member, and a portion of the rotating shaft located in the mixing barrel is provided with spiral mixing blades.

[0010] As a preferred solution of the present invention, an insert cylinder is installed at the center of the bottom end of the mixing cylinder, and the bottom end of the rotating shaft is rotatably inserted into the insert cylinder.

[0011] As a preferred solution of the present invention, a feed vertical pipe is installed on the horizontal part of the material guiding L-shaped cylinder, an upper support frame is installed at the peripheral side wall of the mixing cylinder to adapt to the position of each material guiding L-shaped cylinder, a laterally retractable upper telescopic frame is installed in the upper support frame, and the push ring is detachably installed on the other end of the upper telescopic frame.

[0012] As a preferred solution of the present invention, the lower mold assembly includes a lower mold plate detachably mounted at the center of the top end of the bottom plate and a lower mold base disposed at the top end of the lower mold plate, and the lower mold base is adapted to the size of the upper mold cavity.

[0013] As a preferred solution of the present invention, longitudinally retractable telescopic parts are installed at the four corners of the bottom plate, side clamps are detachably clamped at the four corners of the upper template, the bottom end of the telescopic parts is detachably connected to the bottom end of the side clamp, guide columns are installed at symmetrical positions of the lower template, guide grooves for the guide columns to slide longitudinally through are provided at the adaptation position of the upper mold base, and the top of the upper template is detachably connected to the mixing barrel through a support seat.

[0014] In the above technical solution, the technical effects and advantages provided by the present invention are: In the present invention, a single channel is modified into multiple channels, so that under the premise of not having to achieve proportional mixing of multiple materials, one injection molding raw material can be delivered to the mixing barrel through each feeding channel, which can not only avoid clogging of the feeding channel, but also control the amount of material in a single feeding channel during the feeding process to adjust the raw material proportion, which is more flexible and controllable; and for the improved multi-channel design, after the injection molding is completed, the gate connection in the vertical flow channel is cut off by changing the lateral position of the cutter, that is, the adhesion between the gate in each vertical flow channel and the left and right rear wheel cover outer panels of the automobile after molding is cut off, which is convenient for the subsequent demolding of the left and right rear wheel cover outer panel plastic parts of the automobile. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a front view structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the top view of the structure of the present invention; Figure 4 For the present invention Figure 3 Schematic diagram of the cross-sectional structure at AA in the middle.

[0016] Description of reference numerals: 1. Upper template; 2. Upper mold base; 3. Upper mold cavity; 4. Side clamp; 5. Bottom plate; 6. Lower template; 7. Telescopic member; 8. Lower mold base; 9. Guide column; 10. Guide groove; 11. Support seat; 12. Mixing cylinder; 13. Cylinder cover; 14. Material guide L-shaped cylinder; 15. Feed vertical pipe; 16. Upper support frame; 17. Upper telescopic frame; 18. Push ring; 19. Rotating shaft; 20. Spiral mixing blade; 21. Mounting seat; 22. Driving member; 23. Insertion cylinder; 24. Oblique material guide cylinder; 25. Circulation ring; 26. Vertical flow channel; 27. Horizontal slide groove; 28. Cutting groove; 29. ​​Lower support frame; 30. Lower telescopic frame; 31. Slide plate; 32. Cutter. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0018] The present invention provides Figure 1-4 The multi-material injection molding process of an automobile rear cover shown in the figure comprises a bottom plate 1, a lower mold assembly arranged above the bottom plate 1, and an upper mold assembly longitudinally slidably arranged above the lower mold assembly, the upper mold assembly comprises an upper mold plate 1 and a lower mold base 2 arranged below the upper mold plate 1, an upper mold cavity 3 is opened in the lower mold base 2, a mixing barrel 12 for stirring and mixing multiple raw materials is installed above the upper mold plate 1, a barrel cover 13 is detachably installed on the top of the mixing barrel 12, a plurality of material guide L-shaped barrels 14 for conveying raw materials required for injection molding into the mixing barrel 12 are installed on the top of the barrel cover 13, and a push ring 18 for pushing the raw materials into the mixing barrel 12 is slidably penetrated in the horizontal part of each material guide L-shaped barrel 14, A plurality of inclined material guide barrels 24 are installed at the bottom end of the mixing barrel 12, and a circulation ring 25 for controlling the circulation of the inclined material guide barrel 24 is rotatably arranged in each of the inclined material guide barrels 24, and a vertical flow channel 26 that can be connected to the upper mold cavity 3 is opened at the position where the upper mold plate 1 and the upper mold base 2 are adapted to the inclined material guide barrel 24, and a cutter 32 that can cut off the adhesion of the gate in the vertical flow channel 26 is arranged at the position adapted to each vertical flow channel 26 in the upper mold base 2 for horizontal sliding. After the material enters the material guide L-shaped barrel 14, it will generally be temporarily accumulated in the horizontal part. At this time, the material needs to be pushed into the mixing barrel 12 by sliding the push ring 18 horizontally, and the feed amount can be controlled by controlling the horizontal sliding progress of the push ring 18.

[0019] A transverse groove 27 is transversely opened at the position where each vertical flow channel 26 is adapted to the side wall of the upper mold base 2, and a cutting groove 28 is jointly opened at the connecting part of the vertical flow channel 26 and the transverse groove 27. A lower support frame 29 is installed on the side wall of the upper mold base 2, and a lower telescopic frame 30 is installed on the end of the lower support frame 29. A slide plate 31 that can slide transversely along the transverse groove 27 is installed on the end of the lower telescopic frame 30. The cutter 32 is detachably installed on the other end of the slide plate 31. The cross-sectional size of the slide plate 31 is consistent with the cross-sectional size of the transverse groove 27, and the cross-sectional size of the cutter 32 is consistent with the cross-sectional size of the cutting groove 28. The lower telescopic frame 30 slides transversely to drive the slide plate 31 to slide transversely in the transverse groove 27, thereby changing the transverse position of the cutter 32, thereby cutting off the gate after injection molding.

[0020] A mounting seat 21 is provided at the top of the barrel cover 13, and a driving member 22 is installed in the mounting seat 21. A rotating shaft 19 which can longitudinally penetrate the barrel cover 13 and extend into the mixing barrel 12 is installed at the output end of the driving member 22. The portion of the rotating shaft 19 located in the mixing barrel 12 is provided with a spiral mixing blade 20. An insert barrel 23 is installed at the center of the bottom end of the mixing barrel 12. The bottom end of the rotating shaft 19 is rotatably penetrated in the insert barrel 23. The driving member 22 drives the rotating shaft to rotate, and then the multi-material raw materials in the mixing barrel 12 are mixed and stirred through the spiral mixing blade 20.

[0021] A feed vertical pipe 15 is installed on the horizontal part of the material guiding L-shaped cylinder 14, and an upper support frame 16 is installed at the position of each material guiding L-shaped cylinder 14 on the side wall of the mixing cylinder 12. A laterally retractable upper telescopic frame 17 is installed in the upper support frame 16, and a push ring 18 is detachably installed on the other end of the upper telescopic frame 17. The lateral movement of the upper telescopic frame 17 can change the lateral position of the push ring 18 in the material guiding L-shaped cylinder 14.

[0022] The lower mold assembly includes a lower mold plate 6 detachably mounted at the top center of the bottom plate 6 and a lower mold base 8 arranged at the top of the lower mold plate 6. The lower mold base 8 is adapted to the size of the upper mold cavity 3. The four corners of the bottom plate 5 are equipped with longitudinally retractable telescopic parts 7. The four corners of the upper mold plate 1 are detachably clamped with side clamps 4. The bottom ends of the telescopic parts 7 are detachably connected to the bottom ends of the side clamps 4. Guide columns 9 are installed at symmetrical positions of the lower mold plate 6. A guide groove 10 for the guide column 9 to slide longitudinally is provided at the adaptation position of the upper mold base 2. The top of the upper mold plate 1 is detachably connected to the mixing barrel 12 through a support seat 11.

[0023] In the present invention, a single channel is modified into multiple channels, so that under the premise of not having to achieve proportional mixing of multiple materials, one injection molding raw material can be delivered to the mixing barrel 12 through each feed channel, which can not only avoid clogging of the feed channel, but also control the amount of material in a single feed channel during the feeding process to adjust the raw material ratio, which is more flexible and controllable; and for the improved multi-channel design, after the injection molding is completed, the gate connection in the vertical flow channel 26 is cut off by changing the lateral position of the cutter 32, that is, the adhesion between the gate in each vertical flow channel 26 and the left and right rear wheel cover outer panels of the molded car is cut off, which is convenient for the subsequent demolding of the left and right rear wheel cover outer panel plastic parts of the car.

[0024] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A multi-material injection molding process for an automobile rear cover, characterized in that: The invention comprises a bottom plate (1), a lower die assembly arranged above the bottom plate (1), and an upper die assembly longitudinally slidably arranged above the lower die assembly, the upper die assembly comprising an upper die plate (1) and a lower die seat (2) arranged below the upper die plate (1), an upper die cavity (3) being provided in the lower die seat (2), a mixing barrel (12) capable of stirring and mixing multiple raw materials being installed above the upper die plate (1), a barrel cover (13) being detachably installed at the top end of the mixing barrel (12), a plurality of material guide L-shaped barrels (14) capable of conveying raw materials required for injection molding into the mixing barrel (12) being installed at the top end of the barrel cover (13), and a water supply of each of the material guide L-shaped barrels (14) The flat portion is provided with a push ring (18) for pushing the raw material into the mixing barrel (12) in a transversely sliding manner. A plurality of inclined guide barrels (24) are installed at the bottom end of the mixing barrel (12). A circulation ring (25) is rotatably provided in each of the inclined guide barrels (24) for controlling the circulation of the inclined guide barrel (24). A vertical flow channel (26) which is communicated with the upper mold cavity (3) is provided at a position where the upper mold plate (1) and the upper mold base (2) are adapted to the inclined guide barrel (24). A cutter (32) which is adapted to each vertical flow channel (26) in the upper mold base (2) for cutting off the adhesion of the gate in the vertical flow channel (26) is provided in a transversely sliding manner.

2. The multi-material injection molding process for an automobile rear cover according to claim 1, characterized in that: A transverse slide groove (27) is transversely provided at a position where each vertical flow channel (26) is adapted to the side wall of the upper mold base (2), and a cutting groove (28) is provided at the connecting portion between the vertical flow channel (26) and the transverse slide groove (27). A lower support frame (29) is installed on the side wall of the upper mold base (2), and a lower telescopic frame (30) is installed at the end of the lower support frame (29). A slide plate (31) that can slide transversely along the transverse slide groove (27) is installed at the end of the lower telescopic frame (30), and the cutter (32) is detachably installed at the other end of the slide plate (31).

3. The multi-material injection molding process for an automobile rear cover according to claim 2, characterized in that: The cross-sectional dimensions of the slide plate (31) are consistent with the cross-sectional dimensions of the transverse slide groove (27), and the cross-sectional dimensions of the cutter (32) are consistent with the cross-sectional dimensions of the cutting groove (28).

4. The multi-material injection molding process for an automobile rear cover according to claim 1, characterized in that: A mounting seat (21) is provided at the top end of the barrel cover (13), a driving member (22) is installed in the mounting seat (21), a rotating shaft (19) which can longitudinally penetrate the barrel cover (13) and extend into the mixing barrel (12) is installed at the output end of the driving member (22), and a spiral mixing blade (20) is provided on the portion of the rotating shaft (19) located in the mixing barrel (12).

5. The multi-material injection molding process for an automobile rear cover according to claim 4, characterized in that: An insert cylinder (23) is installed at the center of the bottom end of the mixing cylinder (12), and the bottom end of the rotating shaft (19) is rotatably inserted into the insert cylinder (23).

6. The multi-material injection molding process for an automobile rear cover according to claim 4, characterized in that: A feed vertical pipe (15) is installed at the horizontal portion of the material guiding L-shaped cylinder (14), an upper support frame (16) is installed at the position of each material guiding L-shaped cylinder (14) on the peripheral side wall of the mixing cylinder (12), and a transversely retractable upper telescopic frame (17) is installed in the upper support frame (16), and the push ring (18) is detachably installed at the other end of the upper telescopic frame (17).

7. The multi-material injection molding process for an automobile rear cover according to claim 1, characterized in that: The lower mold assembly comprises a lower mold plate (6) detachably mounted at the center of the top end of the bottom plate (6) and a lower mold base (8) arranged at the top end of the lower mold plate (6); the lower mold base (8) is adapted to the size of the upper mold cavity (3).

8. The multi-material injection molding process for an automobile rear cover according to claim 1, characterized in that: The four corners of the bottom plate (5) are all provided with longitudinally retractable telescopic parts (7), the four corners of the upper mold plate (1) are all detachably connected with side clamps (4), the bottom ends of the telescopic parts (7) are detachably connected to the bottom ends of the side clamps (4), the symmetrical positions of the lower mold plate (6) are all provided with guide columns (9), the matching positions of the upper mold base (2) are provided with guide grooves (10) for the guide columns (9) to slide longitudinally through, and the top end of the upper mold plate (1) is detachably connected to the mixing barrel (12) via a support base (11).

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