CN111590825B

CN111590825B - Prevent that product from leaning on mould structure of broken hole fluff limit

Info

Publication number: CN111590825B
Application number: CN201910128199.9A
Authority: CN
Inventors: 郭明文
Original assignee: Mitac Precision Technology Kunshan Ltd
Current assignee: Mitac Precision Technology Kunshan Ltd
Priority date: 2019-02-21
Filing date: 2019-02-21
Publication date: 2023-01-20
Anticipated expiration: 2039-02-21
Also published as: CN111590825A

Abstract

The invention relates to the technical field of injection molds, and particularly discloses a mold structure for preventing a product from raising edges by breaking a hole, which comprises a male mold core, a female mold core and an insert, wherein the insert comprises an insert body with an inverted T-shaped section and a forming part connected to the top end of the insert body, the male mold core is provided with a through hole, the insert body is accommodated in the through hole, and the forming part is matched with the male mold core and the female mold core to form the product; one end of the insert body close to the forming part is tightly matched with the through hole, and a clearance distance is reserved between the other end of the insert body and the inner wall of the through hole; when the die is closed, the forming part is firstly contacted with the cavity, and when the forming part is contacted with the cavity, the clearance between the broken surfaces of the cavity and the core is 0-0.2 mm. This mould structure can prevent effectively that the product from leaning on broken hole fluff limit.

Description

Prevent that product from leaning on mould structure of broken hole raising limit

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of injection molds, in particular to a mold structure for preventing a product from being broken and fluffed.

[ background ] A method for producing a semiconductor device

With the increasingly widespread use of plastic products, injection molds, which play an important role in the injection molding process, are receiving increasing attention. When some products with small broken holes are injection molded, such as a notebook computer D, a plurality of broken holes with the inner diameter of about 2mm are formed on the products, and a mold structure shown in figure 1 is generally adopted. The mold structure comprises a male mold core 10 ', a female mold core 20 ', and an insert 30 ' embedded in the male mold core 10 ', wherein the top end of the insert 30 ' is matched with the male mold core 10 ' and the female mold core 20 ' to form a product 100. However, with this mold structure, burrs are likely to be generated near the broken position. After the product is injection molded, a deburring process is usually required. This leads to the production processes of the product to be tedious, long cycle, cost increase, and the dimensional accuracy of the broken hole after the deburring process cannot be guaranteed.

Therefore, it is necessary to design a mold structure to prevent the product from raising its edge against the broken hole.

[ summary of the invention ]

The invention aims to provide a die structure for preventing a product from raising edges by broken holes.

In order to achieve the purpose, the invention adopts the following technical scheme:

a mould structure for preventing products from being fuzzed by broken holes comprises a male mould core, a female mould core and an insert, wherein the insert comprises an insert body with an inverted T-shaped section and a forming part connected to the top end of the insert body, the male mould core is provided with a through hole, the insert body is contained in the through hole, and the forming part is matched with the male mould core and the female mould core to form products;

one end of the insert body close to the forming part is tightly matched with the through hole, and a clearance distance is reserved between the other end of the insert body and the inner wall of the through hole;

when the die is closed, the forming part is firstly contacted with the cavity, and when the forming part is contacted with the cavity, the gap between the cavity and the broken surface of the core is 0-0.2 mm.

Furthermore, the through hole comprises a first through hole, the first through hole is tightly matched with one end, close to the forming part, of the insert body, and the length of the first through hole is 5 mm-10 mm.

Furthermore, the through hole also comprises a second through hole, the section of the second through hole is in an inverted T shape, and the second through hole is coaxially communicated with the first through hole; the clearance distance between the inner wall of the second through hole and the insert body is 0-1 mm.

Further, the clearance distance between the inner wall of the second through hole and the insert body is 0.5mm.

Further, when the molding part contacts with the cavity insert, a gap between the cavity insert and the broken surface of the core insert is 0.15mm.

The invention has the beneficial effects that: the sealing glue positioning is realized through the tight fit between one end of the insert body close to the forming part and the core insert; a clearance distance is reserved between one end of the insert body, which is far away from the forming part, and the core insert, so that the insert has a certain deformation space; the forming part of the insert is firstly contacted with the cavity insert when the mold is closed through prepressing the broken part of the insert for a certain distance; the mold is continuously closed, the insert is elastically deformed under the strong pressure of the cavity insert, so that the insert and the cavity insert are tightly matched, the edge fluffing of the product close to the broken hole is avoided, and the mold is simple in structure, convenient to install and low in cost.

[ description of the drawings ]

FIG. 1 is a schematic view of a prior art mold construction;

FIG. 2 is a schematic structural view of the mold structure for preventing the product from fluffing by a broken hole, which is provided by the invention, in a mold closing state;

FIG. 3 is a schematic structural view of the mold structure for preventing the product from raising by breaking holes when the molding part of the insert contacts with the cavity insert;

fig. 4 is a partial structural view of the core insert of fig. 3.

[ detailed description ] embodiments

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

As shown in fig. 2-4, a mold structure for preventing a product from raising edges by breaking holes comprises a male mold core 10, a female mold core 20 and an insert, wherein the insert comprises an insert body 31 with an inverted T-shaped cross section and a forming portion 32 connected to the top end of the insert body 31, the male mold core 10 is provided with a through hole 40, the insert body 31 is accommodated in the through hole 40, and the forming portion 32 is matched with the male mold core 10 and the female mold core 20 to form the product 100; wherein, one end of the insert body 31 close to the forming part 32 is tightly matched with the through hole 40, and a clearance distance is reserved between the other end of the insert body and the inner wall of the through hole 40; when the dies are closed, the forming portion 32 contacts with the cavity insert 20 first, and when the forming portion 32 contacts with the cavity insert 20, the clearance between the broken surfaces of the cavity insert 20 and the core insert 10 is 0-0.2 mm.

The die structure is suitable for forming products with the inner diameter of the near-broken hole within 4 mm. Specifically, the through hole 40 formed in the core insert 10 includes a first through hole 41 and a second through hole 42 which are coaxially communicated with each other. The first through hole 41 is tightly matched with one end of the insert body 31 close to the forming part 32, and the length of the first through hole 41 is 5 mm-10 mm. The cross section of the second through hole 42 is inverted T-shaped, one end of the insert body 31 far away from the forming part 32 is accommodated in the second through hole 42, and the clearance distance between the inner wall of the second through hole 42 and the insert body 31 is 0-1 mm. Preferably, the clearance distance is 0.5mm.

As a preferred embodiment of the present invention, when the molding portion 32 contacts the cavity insert 20, a gap between the cavity insert 20 and the broken surface of the core insert 10 is 0.15mm.

In the mold structure of the invention, the sealing glue positioning is carried out through the tight fit between one end of the insert body 31 close to the forming part 32 and the core insert 10; when the die is closed, the prepressing position of the insert is 0.15mm, and when the clearance between the broken surfaces of the cavity insert 20 and the core insert 10 is 0.15mm, the forming part 32 of the insert is contacted with the cavity insert 20; the mould is continuously closed, the female mould core 20 is pressed into the insert forcibly, and the insert has certain deformation space due to certain elasticity and clearance distance between the insert and the male mould core 10; the insert is elastically deformed, so that the insert is tightly matched with the cavity insert 20, the broken hole edge fluffing of the product 100 is avoided, and the structure is simple, the installation is convenient and the cost is low.

The technical principles of the present invention have been described above in connection with specific embodiments, which are intended to explain the principles of the present invention and should not be construed as limiting the scope of the present invention in any way. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.

Claims

1. A mould structure for preventing a product from raising edges by breaking holes comprises a male mould core, a female mould core and an insert, wherein the insert has elasticity, the insert comprises an insert body with an inverted T-shaped section and a forming part connected to the top end of the insert body, the male mould core is provided with a through hole, the insert body is contained in the through hole, and the forming part is matched with the male mould core and the female mould core to form a product; it is characterized in that the preparation method is characterized in that,

when the die is closed, the forming part is firstly contacted with the female die core, and when the forming part is contacted with the female die core, the clearance between the female die core and the broken surface of the male die core is 0-0.2 mm;

the through hole comprises a first through hole, the first through hole is tightly matched with one end, close to the forming part, of the insert body, and the length of the first through hole is 5-10 mm;

the through hole also comprises a second through hole, the section of the second through hole is in an inverted T shape, and the second through hole is coaxially communicated with the first through hole; the spacing distance between the inner wall of the second through hole and the insert body is greater than 0 and less than or equal to 1mm;

the insert is elastically deformed, so that the insert and the cavity insert are tightly matched.

2. The mold structure according to claim 1, wherein a clearance distance between an inner wall of the second through hole and the insert body is 0.5mm.

3. The mold structure according to claim 1, wherein when the molding portion contacts the cavity core, a gap between the cavity core and the broken surface of the core is 0.15mm.