CN113799332B

CN113799332B - Flash-free mold for thin-wall injection molding product

Info

Publication number: CN113799332B
Application number: CN202111092195.3A
Authority: CN
Inventors: 王声杭
Original assignee: Ningbo Goode Molding Co ltd
Current assignee: Ningbo Goode Molding Co ltd
Priority date: 2021-09-17
Filing date: 2021-09-17
Publication date: 2023-04-11
Anticipated expiration: 2041-09-17
Also published as: CN113799332A

Abstract

The invention relates to a flash-free mold for a thin-wall injection molding product, which comprises an upper mold and a lower mold, wherein a convex platform is arranged on the lower mold, a cavity is arranged on the upper mold, a lower mold cavity is arranged at the top of the platform, an upper mold cavity is arranged at the top of the cavity, the parting surface of the upper mold cavity, the parting surface of the lower mold cavity, the inner peripheral wall of the cavity and the outer peripheral wall of the platform are inclined planes, when the upper mold and the lower mold are closed, the upper mold cavity and the lower mold cavity are combined into a complete mold cavity, the inner peripheral wall and the outer peripheral wall are tightly attached, a plurality of injection molding holes are arranged on the upper mold, a plurality of injection molding channels are arranged on the lower mold, each injection molding hole is respectively communicated with one injection molding channel, each injection molding channel is communicated with the lower mold cavity, so that the platform and the cavity as well as the parting surfaces of the upper mold cavity and the lower mold cavity are more tightly attached, when injection molding materials enter the mold cavity from the injection molding holes through the injection molding channels, no flash is generated at the product boundary, and the technical problem that the flash is easily generated at the product boundary after the injection molding of the film injection molding product in the prior art is solved.

Description

Flash-free mold for thin-wall injection molding product

Technical Field

The invention relates to the technical field of molds, in particular to a flash-free mold for a thin-wall injection molding product.

Background

The thin film injection molded product generally has a thickness of 1.2mm or less, and high pressure is often required at the time of injection molding, and due to the presence of the parting surface on the mold, flash is likely to occur at the boundary of the product, and the thinner the wall surface of the product, the greater the pressure required, and the more flash is likely to occur. The product is subjected to manual deburring treatment after injection molding due to the burrs on the product, so that labor is occupied, the method for manually treating the burrs is low in efficiency and poor in effect, and the product with excessive burrs is directly scrapped, so that the production efficiency of the product is low, and the yield is low.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a flash-free mold for a thin-wall injection molding product, so as to solve the technical problem that the flash is easily generated at the boundary of the product after the mold for the thin-wall injection molding product in the prior art is subjected to injection molding.

In order to solve the technical problem, the invention provides a flash-free die for a thin-wall injection molding product, which comprises an upper die and a lower die, wherein a raised platform is arranged on the lower die, a cavity matched with the platform is arranged on the upper die, a lower die cavity is arranged at the top of the platform, an upper die cavity is arranged at the top of the cavity, the parting surface of the upper die cavity and the parting surface of the lower die cavity are inclined planes, the inner peripheral wall of the cavity and the outer peripheral wall of the platform are inclined planes, and when the upper die and the lower die are closed, the upper die cavity and the lower die cavity are combined into a complete die cavity and the inner peripheral wall and the outer peripheral wall are tightly attached; the upper die is provided with a plurality of injection molding holes, the lower die is provided with a plurality of injection molding channels, each injection molding hole is communicated with the injection molding channels one by one, and each injection molding channel is communicated with the lower die cavity.

After adopting the structure, the flash-free die for the thin-wall injection molding product has the following advantages: through designing the lower mould chamber on the platform, and the periphery wall of platform and the internal perisporium of cavity are the inclined plane, go up die cavity and die cavity's die joint department down and set up to the inclined plane, make between platform and cavity and the laminating between upper and lower die cavity die joint inseparabler for when injection moulding material gets into the die cavity from the hole of moulding plastics through the passageway of moulding plastics, product boundary department does not produce the overlap, has improved the production efficiency and the yields of product, reduces the cost of labor.

As an improvement, the protruding height h of the platform is 3mm to 8mm; if the platform protrusion height h is too high, the processing is difficult, and if the platform protrusion height h is too low, the inclined plane cannot play a flash removing effect.

As an improvement, a plurality of sectional inserts are arranged on the lower die, the inserts are distributed along the outer peripheral wall of the platform and are attached to the outer peripheral wall, two adjacent inserts are attached to each other, and a lower die cavity extends to the inserts; the multi-section type insert can be suitable for products with multiple sizes by replacing the insert or carrying out secondary processing on the insert, if the upper die and the lower die are directly processed, the operation is complex, the cost is high, and even the upper die and the lower die can be damaged.

As an improvement, the width a of the insert ranges from 3mm to 50mm; by adopting the structure, the insert is convenient to install and replace, and the best use effect can be achieved.

As an improvement, the first contact surfaces between two adjacent inserts are all inclined surfaces; by adopting the structure, the connection between the adjacent inserts is more stable, and simultaneously, the flash generated after the injection molding of the product can be prevented.

As an improvement, an included angle α between the parting surface and a vertical plane ranges from 3 ° to 20 °, included angles α between the inner peripheral wall and the outer peripheral wall and between the inner peripheral wall and the vertical plane range from 3 ° to 20 °, and an included angle α between the first contact surface and the vertical plane ranges from 3 ° to 20 °; with the structure, if the included angle is too small, the effect of preventing flash cannot be achieved, and if the included angle is too large, the product is easy to deviate from the original shape; meanwhile, the invention is convenient for processing and easy for demoulding.

As an improvement, the injection molding channels are distributed along the peripheral wall; by adopting the structure, the injection molding is more uniform, and the quality of the injection molded product is better.

Drawings

FIG. 1 is an overall cross-sectional view of a first embodiment of the invention.

Fig. 2 is a partially enlarged view of a portion a in fig. 1.

Fig. 3 is a partially enlarged view of a portion B in fig. 1.

Fig. 4 is a cross-sectional view of a center parting surface in accordance with an embodiment of the present invention.

Fig. 5 is a partially enlarged view of a portion C in fig. 4.

FIG. 6 is a schematic view of the structure of adjacent inserts according to one embodiment of the present invention.

Fig. 7 is an exploded view of the upper mold and the lower mold according to the first embodiment of the present invention.

Reference numerals: 1. an upper die; 2. a lower die; 3. a platform; 4. a concave cavity; 5. a lower die cavity; 6. an upper mold cavity; 7. parting surfaces; 8. an insert; 9. an inner peripheral wall; 10. injection molding holes; 11. injection molding a channel; 12. a first contact surface; 13. an outer peripheral wall.

Detailed Description

The invention relates to a thin-wall injection molding product flashless mold which is explained in detail with the attached drawings.

The first embodiment is as follows:

as shown in fig. 1 to 7, a flash-free mold for a thin-wall injection molding product comprises an upper mold 1 and a lower mold 2, wherein a convex platform 3 is arranged on the lower mold 2, the protruding height h of the platform 3 is 3mm to 8mm, and h is 3mm in the embodiment, so that a good flash removing effect can be achieved; a concave cavity 4 matched with the platform 3 is arranged on the upper die 1, a lower die cavity 5 is arranged on the platform 3, an upper die cavity 6 is arranged in the concave cavity 4, a parting surface 7 of the upper die cavity 6 and a parting surface 7 of the lower die cavity 5 are both inclined surfaces, and an inner peripheral wall 9 of the concave cavity 4 and an outer peripheral wall 13 of the platform 3 are both inclined surfaces; the injection molding machine is characterized in that a plurality of injection molding holes 10 are formed in the upper die 1, a plurality of injection molding channels 11 are formed in the lower die 2, each injection molding hole 10 is communicated with the injection molding channels 11 one by one, each injection molding channel 11 is communicated with the lower die cavity 5, and the injection molding channels 11 are distributed along the peripheral wall 13.

The lower die 2 is also provided with a plurality of sectional inserts 8, the inserts 8 are distributed along the peripheral wall 13 of the platform 3 and are attached to the peripheral wall 13, two adjacent inserts 8 are attached to each other, the lower die cavity 5 extends to the inserts 8, the width a of each insert 8 ranges from 3mm to 50mm, and the width a is 3mm in the embodiment; the first contact surfaces 12 between two adjacent inserts 8 are inclined surfaces, and the contact surface on each insert 8, which is in contact with the peripheral wall 13 of the platform 3, is also an inclined surface; the contained angle alpha scope between die joint 7 and the vertical plane is 3 to 20, interior perisporium 9 contained angle alpha scope between periphery wall 13 and the vertical plane is 3 to 20, contained angle alpha scope between first contact surface 12 and the vertical plane is 3 to 20, alpha is 8 in this embodiment to reach the best flash effect that goes.

When the die is used, after the upper die 1 and the lower die 2 are assembled, the upper die cavity 6 and the lower die cavity 5 are combined into a complete die cavity, the inner peripheral wall 9 and the outer peripheral wall 13 are tightly attached, injection molding is carried out in the die cavity, and high pressure is applied to the die cavity to generate a thin-wall product. In the high-pressure injection molding process, the outer peripheral wall 13 of the platform 3, the inner peripheral wall 9 of the cavity 4, the parting surface 7 of the upper die cavity 6 and the lower die cavity 5 and the first contact surface 12 on the insert 8 are all inclined surfaces, so that the injection molded product cannot generate flash at the boundary even under the action of high pressure; the insert 8 is adjusted, so that the production of similar products with various sizes can be adapted, and the upper die 1 can adjust the relevant sizes adaptively according to the change of the insert 8.

Example two:

the difference between this embodiment and the first embodiment is that the protruding height h of the platform 3 is 8mm, the width a of the insert 8 is 50mm, and the included angles α are all 3 °.

Example three:

the difference between this embodiment and the first embodiment is that the width a of the insert 8 is 30mm and the included angles a are 20 °.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the three embodiments, and all other embodiments obtained by those skilled in the art without inventive efforts shall fall within the protection scope of the present invention.

Claims

1. The flash-free mold for the thin-wall injection molding products comprises an upper mold (1) and a lower mold (2), and is characterized in that a raised platform (3) is arranged on the lower mold (2), a cavity (4) matched with the platform (3) is arranged on the upper mold (1), a lower mold cavity (5) is arranged at the top of the platform (3), an upper mold cavity (6) is arranged at the top of the cavity (4), a parting surface (7) of the upper mold cavity (6) and a parting surface (7) of the lower mold cavity (5) are inclined planes, an inner peripheral wall (9) of the cavity (4) and an outer peripheral wall (13) of the platform (3) are inclined planes, and when the upper mold (1) and the lower mold (2) are closed, the upper mold cavity (6) and the lower mold cavity (5) are combined into a complete mold cavity, and the inner peripheral wall (9) and the outer peripheral wall (13) are tightly attached; the upper die (1) is provided with a plurality of injection molding holes (10), the lower die (2) is provided with a plurality of injection molding channels (11), each injection molding hole (10) is communicated with the injection molding channels (11) one by one, and each injection molding channel (11) is communicated with the lower die cavity (5); platform (3) protrusion height h is 3mm to 8mm, contained angle alpha scope between die joint (7) and the vertical plane is 3 to 20, interior perisporium (9) contained angle alpha scope between periphery wall (13) and the vertical plane is 3 to 20.

2. The flash-free die for thin-walled injection molding products of claim 1, wherein the lower die (2) is provided with a plurality of segmented inserts (8), the inserts (8) are distributed along the peripheral wall (13) of the platform (3) and attached to the peripheral wall (13), two adjacent inserts (8) are attached to each other, and the lower die cavity (5) extends to the inserts (8).

3. A flash-free mold for thin-walled injection molded products according to claim 2 wherein the width a of the insert (8) ranges from 3mm to 50mm.

4. The flash-free die for thin-walled injection molded products of claim 2 wherein the first contact surfaces (12) between two adjacent inserts (8) are all inclined surfaces.

5. A flash-free mould for thin-walled injection moulded products according to claim 4, characterised in that the angle α between the first contact surface (12) and the vertical plane is in the range 3 ° to 20 °.

6. A flash-free mould for thin-walled injection moulded products according to claim 1, characterised in that the injection channels (11) are distributed along the peripheral wall (13).