CN110814315A

CN110814315A - Thimble exhaust structure

Info

Publication number: CN110814315A
Application number: CN201810900875.5A
Authority: CN
Inventors: 李战
Original assignee: Kunshan Huafu Precision Metal Co Ltd
Current assignee: Kunshan Huafu Precision Metal Co Ltd
Priority date: 2018-08-09
Filing date: 2018-08-09
Publication date: 2020-02-21

Abstract

The invention relates to the technical field of molds, in particular to an ejector pin exhaust structure. The thimble exhaust structure of the invention includes: the ejector pin body is provided with a plurality of exhaust grooves at the upper end, the exhaust grooves are spaced at the same length, and the depths of all the exhaust grooves are equal; the top end of the ejector pin body is away from the exhaust groove closest to the lower side of the ejector pin body by a certain distance, so that the exhaust groove is not too close to a casting to be blocked by molten soup, and the exhaust effect can be achieved. Compared with the prior art, the ejector pin exhaust structure has the advantages that the top end of the ejector pin body is provided with the plurality of exhaust grooves with the same width, and the exhaust grooves are at a certain distance from the top end of the ejector pin body, so that the exhaust grooves are not blocked by molten soup due to being too close to a casting, and the exhaust effect can be achieved; the structure has simple processing mode, good exhaust effect and is not easy to block.

Description

Thimble exhaust structure

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of molds, in particular to an ejector pin exhaust structure.

[ background of the invention ]

During the casting formation, gas is generated. And the poor condition that the mold cavity cannot be completely filled with the melt and the formed casting has multiple pores often occurs at the position with a higher casting structure due to unsmooth exhaust.

In order to solve the above problems, the following methods are often adopted in the industry. Firstly, an inlet and outlet sub-line is processed on an inlet, namely an exhaust groove is formed to assist exhaust, but the inlet is mostly fixed in the forming process, the inlet sub-line exhaust is often blocked, and the cost is increased by removing the inlet sub-line through subsequent processing; in addition, not all cases are suitable for processing the inlet wire; secondly, a slag ladle is manufactured in the casting, namely, a gas trapping part is transferred to the slag ladle and then removed in a CNC (computer numerical control) mode, but the manufacturing cost is increased and the risk of shrinkage cavity exists.

Chinese patent CN201220020133.1 discloses a mold exhaust thimble structure, which can achieve the exhaust effect by processing an exhaust strip-shaped hole at the upper end of a thimble main body, and setting a ventilation through hole below the thimble main body and ensuring that the thimble has an exhaust cavity inside. It has the following disadvantages by analysis: firstly, the exhaust strip-shaped hole is arranged on the upper end surface of the thimble, the upper end surface of the thimble is often in direct contact with a casting, and melt blockage is difficult to avoid over time; secondly, this kind of processing mode needs to do too much processing on the thimble, and often need set up a plurality of thimbles on a product and carry out ejecting, and every thimble all so processes and wastes time and energy.

In view of the above, there is a need to develop an ejector pin exhaust structure that is easy to process, has good exhaust effect, and is not easy to be blocked.

[ summary of the invention ]

Therefore, the invention aims to provide the ejector pin exhaust structure which is simple in processing mode, good in exhaust effect and not prone to being blocked. This thimble exhaust structure includes:

in order to achieve the above object, the ejector pin exhaust structure includes:

the ejector pin comprises an ejector pin body, wherein a plurality of exhaust grooves are formed in the upper end of the ejector pin body, the exhaust grooves are spaced at equal intervals and have the same length, and the depths of all the exhaust grooves are equal;

the top end of the ejector pin body is away from the exhaust groove closest to the lower side of the ejector pin body by a certain distance, so that the exhaust groove is not too close to a casting to be blocked by molten soup, and the exhaust effect can be achieved.

Optionally, the widths of the exhaust grooves are equal to each other and are all 3mm, and the depths of the exhaust grooves are 0.2 mm.

Optionally, the width of the exhaust groove decreases gradually downwards along the thimble body.

Optionally, the distance between the top end of the thimble body and the exhaust groove closest to the lower side is 5-7 mm.

Optionally, the number of the exhaust grooves is 3, and the interval length of each exhaust groove is 5 mm.

Optionally, in the machining process, burrs of the casting are extruded into the exhaust groove, and at the moment, the burrs of the casting can be removed through air blowing.

Compared with the prior art, the ejector pin exhaust structure has the advantages that the top end of the ejector pin body is provided with the plurality of exhaust grooves with the same width, and the exhaust grooves are at a certain distance from the top end of the ejector pin body, so that the exhaust grooves are not blocked by molten soup due to being too close to a casting, and the exhaust effect can be achieved; the structure has simple processing mode, good exhaust effect and is not easy to block.

[ description of the drawings ]

FIG. 1 is a schematic structural diagram of a thimble exhaust structure according to the present invention.

FIG. 2 is an enlarged view of a portion of the ejector pin exhausting structure according to the present invention.

[ detailed description ] embodiments

Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of an ejector pin exhaust structure of the present invention, and fig. 2 is an enlarged schematic partial diagram of the ejector pin exhaust structure of the present invention.

The thimble exhaust structure of the invention includes:

the thimble body 10 is provided with a plurality of exhaust grooves at the upper end, the exhaust grooves are spaced at the same length, and the depths of all the exhaust grooves are equal;

the top end of the thimble body 10 is spaced from the nearest exhaust groove 101 below, so that the exhaust groove is not too close to the casting to be blocked by molten metal, and the exhaust effect can be achieved.

Optionally, the width of the exhaust groove 102 is 3mm, and the depth thereof is 0.2 mm; if the air displacement is too large during the molding process, the width of the air discharge groove can be increased.

Optionally, the widths of the exhaust grooves 101, 102, 103 decrease downward sequentially along the thimble body 10; the higher part of the casting structure is most prone to air trapping during processing, the width of the exhaust groove 101 closest to the casting can be moderately increased according to needs, and the widths of other downward exhaust grooves can be set to be smaller.

Optionally, the distance between the top end of the thimble body 101 and the exhaust groove 102 nearest below is 5-7mm, and the exhaust effect is reduced beyond the distance.

Optionally, there are 3 exhaust grooves, and multiple exhaust grooves are provided to fully exhaust; the length of each exhaust groove is 5 mm.

Optionally, in the course of working, can have the deckle edge of foundry goods to extrude in the air discharge duct, can clear away the deckle edge through blowing this moment.

When the exhaust groove on the ejector pin is blocked in the production process, the ejector pin plate is ejected out to be cleaned on the machine table, and the use is convenient; simultaneously because of the long back of production, thimble hole wearing and tearing grow has a small amount of molten soup deckle edges to be crowded into in the thimble hole, and the easy card of thimble limit is died, and after increasing the air discharge duct, deckle edge can be crowded into the air discharge duct in, and the thimble is ejecting back can be to the mould chamber clearance of blowing, and the deckle edge of being crowded in the air discharge duct is cleared up very easily to more effectually prevent that the thimble card from dying, thimble rupture scheduling problem.

The exhaust groove is easy to machine, is suitable for machining and processing a large number of thimbles in actual production, has a good exhaust effect, and is particularly suitable for exhaust when a higher part of a casting structure is formed.

It should be noted that the present invention is not limited to the above embodiments, and any simple modification, equivalent change and modification made to the above embodiments by those skilled in the art based on the technical solution of the present invention fall within the protection scope of the present invention.

Claims

1. The utility model provides a thimble exhaust structure which characterized in that, it includes:

2. The exhaust structure of a thimble according to claim 1, wherein said exhaust grooves are all 3mm wide and 0.2mm deep.

3. The ejector pin exhaust structure according to claim 1, wherein the width of the exhaust groove decreases in sequence downward along the ejector pin body.

4. The ejector pin exhaust structure according to claim 1, wherein a distance between a top end of the ejector pin body and the exhaust groove closest to the bottom is 5-7 mm.

5. The ejector pin exhaust structure according to claim 1, wherein said exhaust grooves have 3, and said interval length of each of said exhaust grooves is 5 mm.

6. The exhaust structure of a thimble according to claim 1, wherein burrs of said casting are pushed into said exhaust grooves during the machining process, and said burrs of said casting are removed by blowing air.