CN107718457B

CN107718457B - Exhaust insert and injection mold

Info

Publication number: CN107718457B
Application number: CN201711164135.1A
Authority: CN
Inventors: 罗功县; 周守涛; 敖建斌; 叶志高
Original assignee: Guangdong Evenwin Precision Technology Co Ltd
Current assignee: Zhejiang Youlang Mould & Plastic Co ltd
Priority date: 2017-11-21
Filing date: 2017-11-21
Publication date: 2020-02-11
Anticipated expiration: 2037-11-21
Also published as: CN107718457A

Abstract

The invention relates to an exhaust insert and an injection mold, wherein the exhaust insert comprises: the sliding block is provided with a mounting hole along the horizontal direction, and the front end of the sliding block forms a matching surface which is used for being tightly attached to the outer surface of the periphery of the collision through hole of the injection molding piece; inlay the needle, set up in the mounting hole, the front end of inlaying the needle is followed the slider stretches out and is used for inserting the injection molding bump the perforation in the back formation and bump the position of wearing, inlay the needle with mounting hole clearance fit so that inlay the needle with form exhaust passage between the slider, exhaust passage is used for forming cold glue back exhaust when moulding plastics. Above-mentioned exhaust mold insert inlays and is formed with exhaust passage between needle and the slider, inserts the collision perforation of injection molding piece and forms and bumps the position of wearing when inlaying the section of stretching out of needle and moulding plastics, and the plastic flows into in the exhaust passage and forms cold accessible exhaust passage behind gluing and exhausts when moulding plastics, and the outward appearance face of the product after moulding plastics does not produce the burr, and the yields is high.

Description

Exhaust insert and injection mold

Technical Field

The invention relates to the technical field of injection molding processing, in particular to an exhaust insert and an injection mold.

Background

Nowadays, more and more electronic products adopt metal materials as a housing, such as mobile phones, ipads, etc., in order to solve the communication problem of electronic products adopting a metal housing, a slot is generally formed on the metal housing, and then injection molding is performed on the metal housing, so that signals can be transmitted from the housing of the electronic products.

When the side hole was seted up to metal casing, at the in-process of moulding plastics, generally follow metal casing's side hole and exhaust, but use current mould when moulding plastics this type of metal casing, often can form the excessive glue of large tracts of land, burr near the lateral wall of metal casing's side hole department, the product yield is lower.

Disclosure of Invention

Accordingly, there is a need for an exhaust insert and an injection mold with good injection molding effect and high yield of processed products.

A venting insert, comprising:

the sliding block is provided with a mounting hole along the horizontal direction, and the front end of the sliding block forms a matching surface which is used for being tightly attached to the outer surface of the periphery of the collision through hole of the injection molding piece;

inlay the needle, set up in the mounting hole, the front end of inlaying the needle is followed the slider stretches out and is used for inserting the injection molding bump the perforation in the back formation and bump the position of wearing, inlay the needle with mounting hole clearance fit so that inlay the needle with form exhaust passage between the slider, exhaust passage is used for forming cold glue back exhaust when moulding plastics.

In one embodiment, the fixture further comprises a positioning screw which is arranged in the mounting hole and is in threaded fit with the sliding block, and the positioning screw abuts against the insert pin.

In one embodiment, a belleville spring is arranged between the set screw and the insert pin to increase the pressure applied by the insert pin at the collision penetrating position.

In one embodiment, the insert pin comprises a head and a rod, the head abuts against the positioning screw, a reducing section is arranged at the front end of the rod, a part of the reducing section extends out of the sliding block, the diameter of the widest part of the reducing section is smaller than that of the rod, and the reducing section is in clearance fit with the sliding block.

In one embodiment, the diameter-variable section comprises a first section with a constant diameter, a second section with a constant diameter, and a third section with a variable diameter, the third section is located between the first section and the second section, the first section is located at the front end of the rod part, the diameter of the first section is smaller than that of the second section, the diameter of the third section is gradually increased from the front end to the rear end, the diameter of the front end of the third section is equal to that of the first section, and the diameter of the rear end of the third section is equal to that of the second section.

In one embodiment, the rear end of the second section is recessed to form an annular groove.

In one embodiment, the rear end of the rod portion is in interference fit with the slider, the side wall of the rod portion is provided with an exhaust surface which enables the rod portion and the slider to form a gap, the head portion is in clearance fit with the slider, the front end of the head portion is sunken to form a step, and the step is connected with the exhaust surface, so that air in the annular groove can flow into the gap between the head portion and the mounting hole through the exhaust surface.

In one embodiment, steps are symmetrically arranged on two opposite sides of the front end face of the annular boss, and a gap is formed between the front end face of the annular boss and the accommodating groove.

In one embodiment, the exhaust surfaces are symmetrically arranged on two opposite sides of the rod part.

An injection mold comprises the exhaust insert.

Above-mentioned exhaust mold insert inlays and is formed with exhaust passage between needle and the slider, inserts the collision perforation of injection molding piece and forms and bumps the position of wearing when inlaying the section of stretching out of needle and moulding plastics, and the plastic flows into in the exhaust passage and forms cold accessible exhaust passage behind gluing and exhausts when moulding plastics, and the outward appearance face of the product after moulding plastics does not produce the burr, and the yields is high.

According to the exhaust insert, the insert pin is provided with the annular groove, the exhaust surface and the step, so that an exhaust channel formed by the insert pin in the mounting hole of the sliding block is larger, and the exhaust during injection molding is facilitated.

Drawings

FIG. 1 is a schematic perspective view of an exemplary exhaust insert and injection molded part in combination;

FIG. 2 is a schematic perspective view of the venting insert of FIG. 1;

FIG. 3 is an enlarged, fragmentary, schematic view of the injection molded part of FIG. 1;

FIG. 4 is an exploded view of the venting insert of FIG. 1;

FIG. 5 is a schematic cross-sectional view of the venting insert of FIG. 1;

FIG. 6 is a side view of the insert pin of the exhaust insert of FIG. 1;

FIG. 7 is a schematic perspective view of the insert pin of the exhaust insert of FIG. 1;

FIG. 8 is an enlarged view of a portion of the injection molded part made by injection molding using the vented insert of FIG. 1 without cold glue removal;

FIG. 9 is an enlarged, partial, side view of an injection molded part made by injection molding using the vented insert of FIG. 1 without cold glue removal.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 3, a gas exhaust insert 10 according to an embodiment includes a slide 100 and a pin 200. The slider 100 has a mounting hole 110 formed along a horizontal direction, and a fitting surface 120 is formed at a front end of the slider 100, and the fitting surface 120 is closely attached to a surface around the collision through hole 510 of the injection molded part 500. The insert pin 200 is arranged in the mounting hole 110, the front end of the insert pin extends out of the slider 100, the extending part is used for being inserted into the collision penetrating hole 510 of the injection molding piece 500 to form a collision penetrating position 201 on the front end face, the insert pin 200 and the mounting hole 110 are in clearance fit, so that an exhaust channel is formed between the insert pin 200 and the slider 100 during injection molding, namely, part of plastic flows into the exhaust channel from a side hole of the injection molding piece 500 during injection molding, and the plastic is exhausted through the exhaust channel after cold glue is formed, so that the phenomenon that burrs are generated in a region (a surface B in figure 3) corresponding to the matching surface 120 of the insert pin 200 and the injection molding piece 500 can be avoided.

Referring to fig. 4 to 7, the insert pin 200 includes a head portion 210 and a rod portion 220, a portion of the front end of the rod portion 220 extends out of the slider 100, the mounting hole 110 of the slider 100 is adapted to the insert pin 200, and the mounting hole 110 is composed of two portions with different diameters, that is, the mounting hole 110 is a stepped hole, a cavity at the front end of the mounting hole 110 is adapted to receive the rod portion 220 of the insert pin 200, and a cavity at the rear end is adapted to receive the head portion 210 of the insert pin 200. The mounting hole 110 is further provided therein with a set screw 300, the set screw 300 is screwed to the slider 100, and the set screw 300 abuts against the head 210 of the insert pin 200 to fix the insert pin 200 to the slider 100. The positioning screw 300 may be a hexagon socket headless screw, which is completely hidden in the slider 100 and is convenient to mount and fix.

A disc spring 400 is further disposed between the set screw 300 and the head 210 of the insert 200, and the number of the disc springs 400 may be one, or may be stacked multiple, such as four or five. The disk spring 400 is a sheet with an opening in the middle, and the disk spring 400 is a concave structure in the direction of the injection molding piece 500, so that the pressure applied by the insert pin 200 at the penetration position 201 can be increased by the disk spring 400.

In an embodiment, the front end of the shaft 220 of the insert pin 200 is provided with a reducing section, the reducing section includes a first section 221, a second section 222 and a third section 223 located between the first section 221 and the second section 222, the first section 221 is located at the front end of the reducing section, the diameters of the first section 221 and the second section 222 are not changed, the diameter of the second section 222 is larger than that of the first section 221, the diameter of the second section 222 is smaller than that of the non-reducing section area of the shaft 220, the diameter of the third section 223 is gradually increased from the front end to the rear end, the diameter of the front end of the third section 223 is equal to that of the first section 221, and the diameter of the rear end of the third section 223 is equal to that of the second section 222, that is, the third section 223 is in a frustum. The area of the cold glue formed in the exhaust channel after injection molding, which corresponds to the third section 223, is horn-shaped, the inner diameter of the cold glue at the section is gradually increased from the inside to the outside of the injection molding product, the rear end of the cold glue at the section is close to a sharp corner, the plastic at the sharp corner A is cooled first in the injection molding process, the plastic can be effectively stopped from continuously flowing towards the rear end of the exhaust channel, gas is exhausted from the sharp corner A, and burrs generated on the surface B can be effectively reduced.

Referring to fig. 6 to 8, the second section 222 is recessed away from the rear end to form an annular groove 2221 to facilitate air exhaust after cold glue formation, and the length of the annular groove 2221 may be set to be greater than that of the second section 222. When the mold is opened, the insert pin 200 is separated from the injection molding part 500, and then CNC machining or other machining is carried out on the injection molding part 500 so as to remove the redundant cold glue 520 at the side hole of the injection molding part 500, and the product meeting the requirements is obtained.

In one embodiment, the gap between the insert pin 200 and the slider 100 is set to be in the range of 0.2mm to 0.5mm, and the depth of the vent channel is set according to the actual size of the injection molded part 500 during production, and is equal to the difference between the diameter of the rod portion 220 of the insert pin 200 and the diameter of the first section 221 of the variable diameter section, for example, when PC (polycarbonate) is used as the plastic material, the depth of the vent channel is set to be 0.02mm to 0.03mm, and when PC (poly oxy-ester) is used as the plastic material, the depth of the vent channel is set to be 0.005mm to 0.015 mm.

Referring to fig. 6 to 9, the side wall of the non-variable diameter section region of the rod portion 220 is provided with an exhaust surface 224, so that a gap is formed between the rod portion 220 and the slider 100, the exhaust surface 224 is a plane, and the exhaust surfaces 224 may be symmetrically disposed on two opposite sides of the rod portion 220. The head 210 is in clearance fit with the mounting hole 110, the front end of the head 210 is recessed to form a step 225, one step 225 surface of the step 225 is connected with the exhaust surface 224, so that the annular groove 2221 is communicated with the rear end cavity of the mounting hole 110 through the exhaust surface 224 and the step 225, and thus, an unobstructed exhaust channel (a shaded part in fig. 6 and 7) is formed between the insert pin 200 and the slider 100. During exhausting, the gas exhausted from the sharp angle a of the reducing section passes through the annular groove 2221, the exhaust surface 224, the gap between the head 210 and the mounting hole 110, and the gap between the set screw 300 and the mounting hole 110 in sequence, and is finally exhausted from the rear end of the mounting hole 110. It will be appreciated that the stem portion 220 may be provided with other structures for forming the exhaust passage, for example, a plurality of grooves formed on the surface of the stem portion 220 in parallel with the axial direction and communicating with the annular groove 2221, that is, grooves may be provided instead of the exhaust surface 224.

According to an embodiment, the injection mold comprises the exhaust insert 10 in the embodiment, and a product produced and processed by the injection mold has a good appearance surface, does not generate the phenomena of glue overflow and burr, and is high in product yield.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A venting insert, comprising:

the front end of the insert pin extends out of the sliding block and is used for being inserted into a collision penetrating hole of an injection molding piece to form a collision penetrating position, the insert pin is in clearance fit with the mounting hole so that an exhaust channel is formed between the insert pin and the sliding block, and the exhaust channel is used for forming cold glue and then exhausting air during injection molding;

the insert pin comprises a rod part, the front end of the rod part is provided with a reducing section, the reducing section is in clearance fit with the sliding block, and one part of the reducing section extends out of the sliding block so as to be inserted into a collision through hole of an injection molding piece; the diameter-variable section comprises a first section, a second section and a third section, wherein the diameter of the first section is not changed, the third section is arranged between the first section and the second section, the first section is arranged at the front end of the rod part, the diameter of the first section is smaller than that of the second section, the diameter of the third section is gradually increased from the front end to the rear end, the diameter of the front end of the third section is equal to that of the first section, and the diameter of the rear end of the third section is equal to that of the second section.

2. The exhaust insert according to claim 1, further comprising a set screw disposed in the mounting hole and threadedly engaged with the slide block, the set screw abutting against the insert pin.

3. The venting insert of claim 2, wherein the set screw is a headless hexagonal socket screw.

4. The venting insert of claim 2, wherein a belleville spring is disposed between the set screw and the insert pin to increase the pressure exerted by the insert pin at the pierce site.

5. The degassing insert according to claim 2, wherein the insert pin further comprises a head portion, the head portion is connected to an end of the stem portion remote from the tapered portion and abuts against the set screw, and a diameter of a widest portion of the tapered portion is smaller than a diameter of the stem portion.

6. The venting insert of claim 5, wherein the rearward end of the second section is recessed to form an annular groove.

7. The exhaust insert according to claim 6, wherein the rear end of the rod portion is in interference fit with the slide block, the side wall of the rod portion is provided with an exhaust surface which enables the rod portion and the slide block to form a gap, the head portion is in clearance fit with the slide block, the front end of the head portion is recessed to form a step, and the step is connected with the exhaust surface so that gas in the annular groove can flow into the gap between the head portion and the mounting hole through the exhaust surface.

8. The venting insert of claim 7, wherein the venting surfaces are symmetrically disposed on opposite sides of the stem portion.

9. An injection mold comprising the vented insert of any of claims 1 to 8.