Mould suitable for internal thread demoulding

Abstract

The utility model discloses a mold suitable for internal thread demolding, which comprises a front mold core and a rear mold core, the front mold core and the rear mold core are matched to form a cavity of an injection product, a threaded part is rotatably mounted in the rear mold core, a threaded demolding mechanism is mounted on the lower side of the threaded part, an insert is mounted in the threaded part, and a forced demolding core is mounted in the insert. The tops of the threaded part, the insert and the forced demolding core are all arranged in the cavity, a lock plate is installed at the bottom of the insert, a limiting lock block is installed on one side of the top of the lock plate, the bottom of the forced demolding core penetrates through the lock plate and extends to the lower side of the lock plate, a wear-resisting sleeve is installed on the lower side of the forced demolding core in a sliding mode, and a limiting block is arranged at the bottom of the forced demolding core. According to the utility model, before the product is demoulded during the first mould opening, the second mould opening action is carried out to finish the demoulding of the forced demoulding core and the inverted buckle of the product, then the first mould opening action is carried out, and then the demoulding is carried out according to a conventional thread twisting mode to realize the automatic dropping of the product, so that the problem of pulling deformation of the product caused by the inverted buckle is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology, specifically relating to a mold suitable for demolding internal threads. Background Technology

[0002] Molds are various shapes and tools used in industrial production to obtain desired products through methods such as injection molding, blow molding, extrusion, die casting, forging, smelting, and stamping. In short, molds are tools used to create shaped objects and are often referred to as the "mother of industry."

[0003] Plastic parts produced by injection molding have replaced some metal parts due to their unique advantages such as light weight, strong corrosion resistance, bright colors, simple production process, low cost, high efficiency and good processing performance. Therefore, the prerequisite for ensuring the high quality of plastic parts is their mold design. For internal thread plastic parts, the internal thread rotation demolding method is often used. However, when there are undercuts inside the product, the problem of stretching and deformation will occur. Therefore, there is an urgent need for a mold suitable for internal thread demolding to solve the above problems. Utility Model Content

[0004] In view of the problems mentioned above in the background art, the purpose of this utility model is to provide a mold suitable for demolding internal threads.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0006] A mold suitable for internal thread demolding includes a front mold core and a rear mold core, which cooperate to form a cavity for an injection molded product. A threaded component is rotatably installed inside the rear mold core. A threaded demolding mechanism is installed on the lower side of the threaded component. An insert is installed inside the threaded component, and a strong demolding core is installed inside the insert. The tops of the threaded component, the insert, and the strong demolding core are all located within the cavity. A locking plate is installed at the bottom of the insert. A limit locking block is installed on one side of the top of the locking plate. The bottom of the strong demolding core penetrates the locking plate and extends to its lower side. A wear-resistant sleeve is slidably installed on the lower side of the strong demolding core, and a limit block is provided at the bottom of the strong demolding core.

[0007] Furthermore, the front mold core is fitted with a front mold insert at the corresponding core release point, an A-plate is fitted on the outer side of the front mold core, and a panel is fitted on the top of the A-plate. This structural design facilitates the molding and production of the product.

[0008] Further specifying, a B-plate is installed on the outer side of the rear mold core, and a first support plate, a second support plate, a third support plate, and a fourth support plate are sequentially installed on the bottom of the B-plate from top to bottom. Square irons are installed on both sides of the bottom of the fourth support plate, and a base plate is installed on the bottom of the square irons. This structural design facilitates product demolding.

[0009] Further specifying, the first and second support plates have mounting grooves at corresponding threaded demolding mechanisms, with the threaded demolding mechanisms installed within these grooves. The third support plate has assembly grooves at corresponding locking plates and wear-resistant sleeves, with the locking plates and wear-resistant sleeves installed within these assembly grooves. The top of the fourth support plate has a groove in which a pressure plate is installed. The pressure plate has assembly holes that match the forced demolding core and the limiting block, with the forced demolding core and the limiting block installed within these assembly holes. This structural design facilitates the fixed installation of the threaded demolding mechanism, locking plate, and forced demolding core.

[0010] Furthermore, the wear-resistant sleeve is made of bronze. This structural design extends the service life of the wear-resistant sleeve.

[0011] The beneficial effects of this utility model are as follows: By using a combination of threaded parts, threaded demolding mechanism, inserts, strong demolding core, locking plate, limiting locking block, wear-resistant sleeve and limiting block, this utility model performs a second demolding action before the product is demolded in the first mold opening, completing the demolding of the strong demolding core and the product undercut. Then, the first mold opening action is performed, and then the product is automatically detached by the conventional threaded demolding method, avoiding the problem of product deformation caused by undercut. Attached Figure Description

[0012] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0013] Fig. 1 This is a schematic diagram of the axial structure of a mold suitable for demolding internal threads, according to an embodiment of the present invention.

[0014] Fig. 2 This is a cross-sectional structural diagram of a mold suitable for demolding internal threads, according to an embodiment of the present invention.

[0015] Fig. 3 This is an enlarged structural diagram of point A of a mold suitable for demolding internal threads, according to an embodiment of the present invention;

[0016] The symbols for the main components are explained below:

[0017] 1. Front mold core, 2. Rear mold core, 3. Threaded part, 4. Threaded demolding mechanism, 5. Insert, 6. Strong core release, 7. Locking plate, 8. Limiting locking block, 9. Wear-resistant sleeve, 10. Limiting block, 11. Front mold insert, 12. B plate, 13. First bearing plate, 14. Second bearing plate, 15. Third bearing plate, 16. Fourth bearing plate, 17. Square iron, 18. Base plate, 19. Mounting groove, 20. Recess, 21. Pressure plate, 22. Assembly hole, 23. Undercut. Detailed Implementation

[0018] To enable those skilled in the art to better understand this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0019] like Figs. 1-3 As shown, this utility model discloses a mold suitable for internal thread demolding. The front mold core 1 and the rear mold core 2 cooperate to form the cavity of the injection molded product. A threaded component 3 is rotatably installed inside the rear mold core 2. A threaded demolding mechanism 4 is installed on the lower side of the threaded component 3. An insert 5 is installed inside the threaded component 3. A strong demolding core 6 is installed inside the insert 5. The tops of the threaded component 3, the insert 5, and the strong demolding core 6 are all located inside the cavity. A locking plate 7 is installed at the bottom of the insert 5. A limit locking block 8 is installed on one side of the top of the locking plate 7. The bottom of the strong demolding core 6 passes through the locking plate 7 and extends to its lower side. A wear-resistant sleeve 9 is slidably installed on the lower side of the strong demolding core 6. A limit block 10 is provided at the bottom of the strong demolding core 6.

[0020] Preferably, the front mold core 1 is fitted with a front mold insert 11 at the corresponding strong ejector core 6, an A plate is fitted on the outer side of the front mold core 1, and a panel is fitted on the top of the A plate. This structural design facilitates the molding and production of the product. In practice, other mounting structures for the front mold core 1 and the front mold insert 11 can also be considered depending on the specific circumstances.

[0021] Preferably, a B-plate 12 is mounted on the outer side of the rear mold core 2. From top to bottom, a first support plate 13, a second support plate 14, a third support plate 15, and a fourth support plate 16 are sequentially mounted on the bottom of the B-plate 12. Square iron blocks 17 are mounted on both sides of the bottom of the fourth support plate 16, and a base plate 18 is mounted on the bottom of the square iron blocks 17. This structural design facilitates product demolding. In practice, other mounting structures for the rear mold core 2 can also be considered depending on the specific circumstances.

[0022] Preferably, the first support plate 13 and the second support plate 14 have mounting grooves 19 corresponding to the threaded demolding mechanism 4, and the threaded demolding mechanism 4 is installed in the mounting grooves 19. The third support plate 15 has assembly grooves corresponding to the locking plate 7 and the wear-resistant sleeve 9, and the locking plate 7 and the wear-resistant sleeve 9 are installed in the assembly grooves. The top of the fourth support plate 16 has a groove 20, and a pressure plate 21 is installed in the groove 20. The pressure plate 21 has assembly holes 22 that match the strong demolding core 6 and the limiting block 10, and the strong demolding core 6 and the limiting block 10 are installed in the assembly holes 22. This structural design facilitates the fixed installation of the threaded demolding mechanism 4, the locking plate 7, and the strong demolding core 6. In practice, other installation structure shapes for the threaded demolding mechanism 4, the locking plate 7, and the strong demolding core 6 can also be considered depending on the specific circumstances.

[0023] Preferably, the wear-resistant sleeve 9 is made of bronze. This structural design extends the service life of the wear-resistant sleeve 9. However, other structural shapes of the wear-resistant sleeve 9 can also be considered depending on the specific circumstances.

[0024] In this embodiment, during injection molding, the front mold core 1 and the rear mold core 2 close to form a cavity. An external injection molding machine performs injection molding, filling the cavity with the plastic material for molding. After molding, because an undercut 23 is formed inside the product, two mold opening actions are required. Before the product is demolded after the first mold opening, a second mold opening action is performed to separate the parts on the upper side of the third support plate 15 from the fourth support plate 16. At this time, the core release 6 is fixedly installed on the fourth support plate 16 by the bottom limiting locking block 8. Within the four bearing plates 16, the strong ejector core 6 is kept in place, thereby forcibly disengaging the undercut 23 on the product within the rear mold core 2 from the strong ejector core 6. After the undercut 23 on the product is completely disengaged from the strong ejector core 6, the first mold opening action is performed, causing the panel to drive the A plate, which in turn drives the front mold core 1 and the rear mold core 2 to separate and open the mold. Then, following the conventional threaded method, the threaded demolding mechanism 4 drives the threaded part 3 to rotate and demold, thereby achieving automatic product release and avoiding product deformation caused by the undercut.

[0025] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A mold suitable for demolding internal threads, characterized in that: The mold includes a front mold core (1) and a rear mold core (2). The front mold core (1) and the rear mold core (2) cooperate to form the cavity of the injection molded product. A threaded part (3) is rotatably installed inside the rear mold core (2). A threaded demolding mechanism (4) is installed on the lower side of the threaded part (3). An insert (5) is installed inside the threaded part (3). A strong ejector core (6) is installed inside the insert (5). The tops of the threaded part (3), the insert (5) and the strong ejector core (6) are all set inside the cavity. A locking plate (7) is installed at the bottom of the insert (5). A limit locking block (8) is installed on one side of the top of the locking plate (7). The bottom of the strong ejector core (6) passes through the locking plate (7) and extends to its lower side. A wear-resistant sleeve (9) is slidably installed on the lower side of the strong ejector core (6). A limit block (10) is provided at the bottom of the strong ejector core (6).

2. A mold suitable for demolding internal threads according to claim 1, characterized in that: The front mold core (1) is fitted with a front mold insert (11) at the corresponding strong core (6), and an A plate is installed on the outer side of the front mold core (1), and a panel is installed on the top of the A plate.

3. A mold suitable for demolding internal threads according to claim 2, characterized in that: A B plate (12) is installed on the outer side of the rear mold core (2). A first support plate (13), a second support plate (14), a third support plate (15) and a fourth support plate (16) are installed on the bottom of the B plate (12) from top to bottom. Square irons (17) are installed on both sides of the bottom of the fourth support plate (16). A base plate (18) is installed on the bottom of the square irons (17).

4. A mold suitable for demolding internal threads according to claim 3, characterized in that: The first support plate (13) and the second support plate (14) are provided with mounting grooves (19) at the corresponding threaded demolding mechanism (4), and the threaded demolding mechanism (4) is installed in the mounting groove (19). The third support plate (15) is provided with assembly grooves at the corresponding locking plate (7) and wear-resistant sleeve (9), and the locking plate (7) and wear-resistant sleeve (9) are installed in the assembly groove. The top of the fourth support plate (16) is provided with a groove (20), and a pressure plate (21) is installed in the groove (20). The pressure plate (21) is provided with assembly holes (22) that match the strong demolding core (6) and the limiting block (10), and the strong demolding core (6) and the limiting block (10) are installed in the assembly holes (22).

5. A mold suitable for demolding internal threads according to claim 4, characterized in that: The wear-resistant sleeve (9) is a bronze wear-resistant sleeve.

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