Mold for forming a plastic male-female part and process

Abstract

The application discloses a male and female plastic part forming die, which comprises a rotating disc, a die support, a lower die shell, a lower die core, a first upper die core, a second upper die core, an upper die shell and a die top plate, the die support is fixed at an eccentric position of the rotating disc, the lower die shell is fixed on the die support, the lower die core is arranged in the lower die shell, a hard rubber workpiece forming cavity is arranged in the lower die core, the first upper die core is arranged on the top of the lower die core and covers the hard rubber workpiece forming cavity, the upper die shell is fixed on the top of the lower die shell and covers the first upper die core, and the die top plate is fixed on the top of the upper die shell; after a hard rubber workpiece is formed in the hard rubber workpiece forming cavity by injection molding, the rotating disc is rotated by a preset angle, fluid soft rubber is secondarily injected into the inner side of the second upper die core, so that a soft rubber part is formed at the top end of the hard rubber workpiece. The application can effectively save space and labor, help reduce cost and significantly improve production efficiency.

Description

Technical Field

[0001] This invention relates to injection molding equipment, and more particularly to a molding die and process for irregularly shaped plastic parts. Background Technology

[0002] Currently, many plastic parts need to be manufactured using injection molding, which includes processes that involve molding two different types of plastic materials into a single piece. For example, consider a plastic part used for rapid blood testing. Figure 11 It includes a hard plastic workpiece 100 and a soft plastic part 101 located at its top. For such workpieces, the process is generally to first use a mold to injection mold the hard plastic workpiece 100, and then transfer it to another device to injection mold the soft plastic part 101 on the basis of the hard plastic workpiece 100. The whole process requires a lot of manual intervention, which not only wastes costs, but also has low work efficiency and cannot meet production requirements. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a mold and process for molding irregularly shaped plastic parts that saves space, saves labor, helps reduce costs, and improves production efficiency, in order to address the shortcomings of the prior art.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.

[0005] A molding die for irregularly shaped plastic parts includes a turntable, a mold support, a lower mold shell, a lower mold core, a first upper mold core, a second upper mold core, an upper mold shell, and a mold top plate. The mold support is fixed at an eccentric position on the turntable, the lower mold shell is fixed on the mold support, the lower mold core is disposed within the lower mold shell, and a hard plastic workpiece forming cavity is formed within the lower mold core. The first upper mold core is disposed on top of the lower mold core and covers the hard plastic workpiece forming cavity. The upper mold shell is fixed on top of the lower mold shell and covers the first upper mold core. The mold top plate is fixed on top of the upper mold shell. After a hard plastic workpiece is formed by injection molding in the hard plastic workpiece forming cavity, the turntable rotates by a preset angle and moves the mold support from a first injection molding station to a second injection molding station. Then, the first upper mold core is replaced with the second upper mold core, and fluid soft plastic is injected a second time into the inner side of the second upper mold core to form a soft plastic part at the top of the hard plastic workpiece.

[0006] Preferably, the rotation angle of the turntable is 180° each time it rotates.

[0007] Preferably, it includes a drive block for driving the lower mold core to close or open.

[0008] Preferably, the bottom sides of the lower mold core are respectively provided with slide rails, and the slide rails are slidably connected to the lower mold shell.

[0009] Preferably, the drive block is vertical, and an outwardly inclined drive rod is formed at the top of the drive block. An inclined slot is provided on the lower mold core, and the inclined drive rod passes through the inclined slot and the two are slidably engaged. The mold support is provided with an opening and closing drive mechanism for driving the drive block to rise or fall. When the drive block rises, it drives the lower mold core to move outward and perform a mold opening action. When the drive block falls, it drives the lower mold core to move inward and perform a mold closing action.

[0010] Preferably, the first upper mold core has a hard plastic injection port at its center, and the second upper mold core has a soft plastic injection port at its center.

[0011] Preferably, the mold support and the mold top plate are fixedly connected by a first vertical connecting arm.

[0012] Preferably, the bottom surface of the first upper mold core is formed with a downwardly protruding pre-filling module, the pre-filling module having the same shape as the soft rubber part, and the pre-filling module being aligned with the top of the molding cavity of the hard rubber workpiece.

[0013] Preferably, a planar cavity is formed at the bottom of the second upper mold core, and the planar cavity is aligned with the top of the forming cavity of the hard plastic workpiece.

[0014] A molding process for irregularly shaped plastic parts, the process being implemented based on a mold, the mold including a turntable, a mold support, a lower mold shell, a lower mold core, a first upper mold core, a second upper mold core, an upper mold shell, and a mold top plate. The mold support is fixed at an eccentric position on the turntable, the lower mold shell is fixed on the mold support, the lower mold core is disposed within the lower mold shell, and a hard plastic workpiece forming cavity is formed within the lower mold core. The first upper mold core is disposed on top of the lower mold core and covers the hard plastic workpiece forming cavity, and the upper mold shell is fixed on top of the lower mold shell. The upper mold shell covers the first upper mold core, and the mold top plate is fixed to the top of the upper mold shell. The process includes: firstly, injecting fluid hard plastic into the molding cavity of the hard plastic workpiece through the first upper mold core; after the hard plastic workpiece is formed by injection molding in the molding cavity, the turntable rotates at a preset angle and drives the mold support to move from the first injection molding station to the second injection molding station; then, the first upper mold core is replaced with the second upper mold core; and then fluid soft plastic is injected a second time into the inner side of the second upper mold core so that the top of the hard plastic workpiece forms a soft plastic part.

[0015] The present invention discloses a molding die and process for irregularly shaped plastic parts. During operation, fluid hard plastic is first injected into the molding cavity of the hard plastic workpiece through the first upper mold core. After the hard plastic workpiece is formed by injection molding, the turntable is rotated by a preset angle. The turntable drives the mold support from the first injection molding station to the second injection molding station. Then, the first upper mold core is replaced with the second upper mold core, and a second injection is performed, injecting fluid soft plastic into the inner side of the second upper mold core. Finally, a soft plastic part is formed at the top of the hard plastic workpiece. Compared with the prior art, the present invention only requires controlling the turntable to rotate a certain angle to realize the conversion of the mold between the first and second injection molding stations, which not only saves space but also reduces manual operation, helping to reduce labor costs and improve production efficiency. Attached Figure Description

[0016] Figure 1 This is a perspective view of the molding die for irregularly shaped plastic parts according to the present invention;

[0017] Figure 2 This is a partial exploded view of the irregular plastic part molding die of the present invention during the installation of the first upper mold core;

[0018] Figure 3 This is a partial exploded view of the mold for molding irregular plastic parts of the present invention during the installation of the second upper mold core;

[0019] Figure 4 This is an internal structural diagram of the molding die for irregularly shaped plastic parts of the present invention;

[0020] Figure 5 for Figure 4 Enlarged view of section A;

[0021] Figure 6 for Figure 4 Enlarged view of section B;

[0022] Figure 7 This is a structural diagram of the drive block and the lower mold core;

[0023] Figure 8 Here is a structural diagram of the driver block;

[0024] Figure 9 A three-dimensional view of the first upper mold core;

[0025] Figure 10 A three-dimensional view of the second upper mold core;

[0026] Figure 11 This is a structural diagram of an irregularly shaped plastic part after injection molding. Detailed Implementation

[0027] The present invention will now be described in more detail with reference to the accompanying drawings and embodiments.

[0028] This invention discloses a molding die for irregularly shaped plastic parts, combined with Figures 1 to 11 As shown, it includes a turntable 1, a mold support 2, a lower mold shell 3, a lower mold core 4, a first upper mold core 5, a second upper mold core 6, an upper mold shell 7, and a mold top plate 8. The mold support 2 is fixed to an eccentric position on the turntable 1. The lower mold shell 3 is fixed on the mold support 2. The lower mold core 4 is disposed inside the lower mold shell 3, and a hard plastic workpiece forming cavity is formed inside the lower mold core 4. The first upper mold core 5 is disposed on top of the lower mold core 4 and covers the hard plastic workpiece forming cavity. The upper mold shell 7 is fixed to the lower mold shell 3. The top of the mold is covered by the upper mold shell 7, and the mold top plate 8 is fixed to the top of the upper mold shell 7. After the hard plastic workpiece 100 is formed by injection molding in the molding cavity, the turntable 1 rotates at a preset angle and drives the mold support 2 to move from the first injection molding station to the second injection molding station. Then the first upper mold core 5 is replaced with the second upper mold core 6. Then the fluid soft plastic is injected into the inner side of the second upper mold core 6 for a second time, so that the top of the hard plastic workpiece 100 forms a soft plastic part 101.

[0029] During operation, the mold first injects fluid hard plastic into the molding cavity of the hard plastic workpiece through the first upper mold core 5. After the hard plastic workpiece 100 is formed by injection molding in the molding cavity, the turntable 1 is rotated by a preset angle. The turntable 1 drives the mold support 2 from the first injection molding station to the second injection molding station. Then, the first upper mold core 5 is replaced with the second upper mold core 6, and a second injection is performed. Fluid soft plastic is injected into the inner side of the second upper mold core 6 a second time. Finally, a soft plastic part 101 is formed at the top of the hard plastic workpiece 100. Compared with the prior art, the present invention only needs to control the turntable 1 to rotate a certain angle to realize the conversion of the mold between the first injection molding station and the second injection molding station. This not only saves space but also reduces manual operation, which helps to reduce labor costs and improve production efficiency.

[0030] As a preferred embodiment, the turntable 1 rotates by 180° each time. This angle setting is advantageous for implementing motion control of the turntable 1.

[0031] To achieve automatic mold opening and closing, combined with Figure 7 and Figure 8 As shown, this embodiment includes a drive block 9 for driving the lower mold core 4 to close or open.

[0032] Furthermore, slide rails 40 are respectively provided on both sides of the bottom of the lower mold core 4, and the slide rails 40 are slidably connected to the lower mold shell 3. In this embodiment, by setting the slide rails 40, the smooth movement of the lower mold core 4 during the mold opening and closing process can be ensured.

[0033] In this embodiment, a driving method that converts lifting motion into horizontal motion is preferred to achieve mold opening and closing control. Specifically, the driving block 9 is vertical, and an outwardly inclined driving rod 90 is formed at the top of the driving block 9. An inclined slot 41 is provided on the lower mold core 4, and the inclined driving rod 90 passes through the inclined slot 41 and the two are slidably engaged. The mold support 2 is provided with an opening and closing driving mechanism for driving the driving block 9 to rise or fall. When the driving block 9 rises, it drives the lower mold core 4 to move outward and perform the mold opening action. When the driving block 9 falls, it drives the lower mold core 4 to move inward and perform the mold closing action.

[0034] Combination Figures 2 to 6 As shown, in order to achieve glue injection, in this embodiment, the center of the first upper mold core 5 is provided with a hard glue injection port 50, and the center of the second upper mold core 6 is provided with a soft glue injection port 60.

[0035] In order to reinforce the mold as a whole, in this embodiment, the mold support 2 and the mold top plate 8 are fixedly connected by the first vertical connecting arm 10.

[0036] Regarding the specific construction of the first and second upper mold cores, combined with Figure 9 and Figure 10 As shown, in this embodiment, a downwardly protruding pre-filling module 51 is formed on the bottom surface of the first upper mold core 5. The pre-filling module 51 has the same shape as the soft rubber part 101, and the pre-filling module 51 is aligned with the top of the hard rubber workpiece molding cavity.

[0037] In the above structure, the pre-filling module 51 provided on the bottom surface of the first upper mold core 5 has the function of forming a groove corresponding to the shape of the soft rubber part 101 at the top of the hard rubber workpiece 100 during the molding process of the hard rubber workpiece 100, as a reserved space for the molding of the soft rubber part 101.

[0038] Based on this, a planar cavity 61 is formed at the bottom of the second upper mold core 6, and the planar cavity 61 is aligned with the top end of the molding cavity of the hard plastic workpiece. Based on the above structure, after the second upper mold core 6 injects soft plastic for the second time, the soft plastic part 101 is formed in the groove at the top end of the hard plastic workpiece 100 accordingly.

[0039] Based on the above-described mold structure, this invention also discloses a molding process for irregularly shaped plastic parts. Specifically, the process is implemented using a mold, which includes a turntable 1, a mold support 2, a lower mold shell 3, a lower mold core 4, a first upper mold core 5, a second upper mold core 6, an upper mold shell 7, and a mold top plate 8. The mold support 2 is fixed to an eccentric position on the turntable 1, the lower mold shell 3 is fixed to the mold support 2, the lower mold core 4 is disposed within the lower mold shell 3, and a hard plastic workpiece forming cavity is formed within the lower mold core 4. The first upper mold core 5 is disposed on top of the lower mold core 4 and covers the hard plastic workpiece forming cavity. The upper mold shell 7 is fixed to the turntable 1. The upper mold shell 7 covers the top of the lower mold shell 3 and the upper mold shell 7 covers the first upper mold core 5. The mold top plate 8 is fixed to the top of the upper mold shell 7. The process includes: firstly, injecting fluid hard plastic into the molding cavity of the hard plastic workpiece through the first upper mold core 5; after the hard plastic workpiece 100 is formed by injection molding in the molding cavity, the turntable 1 rotates at a preset angle and drives the mold support 2 to move from the first injection molding station to the second injection molding station; then, the first upper mold core 5 is replaced with the second upper mold core 6; then, fluid soft plastic is injected a second time into the inner side of the second upper mold core 6 so that the top of the hard plastic workpiece 100 forms a soft plastic part 101.

[0040] The turntable 1 rotates 180° each time. Based on the above mold, process, and principle, this invention can effectively save space and labor, help reduce costs, and significantly improve production efficiency.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the technical scope of the present invention should be included within the scope of protection of the present invention.

Claims

1. A molding die for irregularly shaped plastic parts, characterized in that, The mold includes a turntable (1), a mold support (2), a lower mold shell (3), a lower mold core (4), a first upper mold core (5), a second upper mold core (6), an upper mold shell (7), and a mold top plate (8). The mold support (2) is fixed to the eccentric position of the turntable (1). The lower mold shell (3) is fixed on the mold support (2). The lower mold core (4) is located inside the lower mold shell (3). A hard plastic workpiece forming cavity is opened in the lower mold core (4). The first upper mold core (5) is located on the top of the lower mold core (4) and covers the hard plastic workpiece forming cavity. The upper mold shell (7) is fixed to the turntable (1). The top of the mold shell (3) and the upper mold shell (7) cover the first upper mold core (5). The mold top plate (8) is fixed to the top of the upper mold shell (7). After the hard plastic workpiece (100) is formed by injection molding in the molding cavity, the turntable (1) rotates at a preset angle and drives the mold support (2) to move from the first injection molding station to the second injection molding station. Then the first upper mold core (5) is replaced with the second upper mold core (6). Then the inner side of the second upper mold core (6) is injected with fluid soft plastic for the second time so that the top of the hard plastic workpiece (100) forms a soft plastic part (101). The rotation angle of the turntable (1) is 180° each time it rotates; It includes a drive block (9) for driving the lower mold core (4) to close or open the mold; The bottom sides of the lower mold core (4) are respectively provided with slide rails (40), and the slide rails (40) are slidably connected to the lower mold shell (3); The drive block (9) is vertical, and an outwardly inclined drive rod (90) is formed at the top of the drive block (9). An inclined slot (41) is provided on the lower mold core (4). The inclined drive rod (90) passes through the inclined slot (41) and the two are slidably engaged. The mold support (2) is provided with an opening and closing drive mechanism for driving the drive block (9) to rise or fall. When the drive block (9) rises, it drives the lower mold core (4) to move outward and perform the mold opening action. When the drive block (9) falls, it drives the lower mold core (4) to move inward and perform the mold closing action. The first upper mold core (5) has a hard plastic injection port (50) at its center, and the second upper mold core (6) has a soft plastic injection port (60) at its center.

2. The irregular plastic part molding die as described in claim 1, characterized in that, The mold support (2) and the mold top plate (8) are fixedly connected by the first vertical connecting arm (10).

3. The irregular plastic part molding die as described in claim 1, characterized in that, The bottom surface of the first upper mold core (5) is formed with a downward protruding prefill module (51). The prefill module (51) has the same shape as the soft rubber part (101). The prefill module (51) is aligned with the top of the hard rubber workpiece molding cavity.

4. The irregular plastic part molding die as described in claim 1, characterized in that, The bottom of the second upper mold core (6) is formed with a planar cavity (61), which is aligned with the top of the hard plastic workpiece forming cavity.

5. A molding process for irregularly shaped plastic parts, characterized in that, The process is based on the mold described in claim 1. The process includes: firstly, injecting fluid hard plastic into the molding cavity of the hard plastic workpiece through the first upper mold core (5), and after the hard plastic workpiece (100) is formed by injection molding in the molding cavity, the turntable (1) rotates at a preset angle and drives the mold support (2) to move from the first injection molding station to the second injection molding station. Then, the first upper mold core (5) is replaced with the second upper mold core (6), and then fluid soft plastic is injected into the inner side of the second upper mold core (6) for a second time so that the top of the hard plastic workpiece (100) forms a soft plastic part (101).

Images