CN204596767U

CN204596767U - Outer wall stream guidance pressing die head structure

Info

Publication number: CN204596767U
Application number: CN201520252652.4U
Authority: CN
Inventors: 柯岩
Original assignee: Jiangsu Changjiang Electronics Technology Co Ltd
Current assignee: JCET Group Co Ltd
Priority date: 2015-04-24
Filing date: 2015-04-24
Publication date: 2015-08-26
Anticipated expiration: 2025-04-24

Abstract

The utility model relates to a kind of outer wall stream guidance pressing die head structure, it comprises inner center pattern (1) and peripheral pressing mold wall (4), described center pattern (1) four side is provided with pressure tin step (5), described pressing mold wall (4) both sides or corner offer stream guidance groove (6), and described stream guidance groove (6) is connected with inside center pattern (1).A kind of outer wall stream guidance of the utility model pressing die head structure, its structure is simple, and manufacture difficulty is low, easy for installation, does not need other parts of change board, has saved production cost; Change the shape of air discharge duct according to the difference of chip size, the quantity etc. of width, degree of depth equidimension and air discharge duct, does not have limitation; Effectively residual air, unnecessary tin in the process of pressure tin, to outside outflow extrusion type chamber, can be avoided load tin cavity, air bubble problem, and effectively can be controlled shape and the thickness of tin, contribute to the reliability promoting pressing mold load.

Description

Outer wall stream guidance pressing die head structure

Technical field

The utility model relates to a kind of outer wall stream guidance pressing die head structure, belongs to technical field of semiconductor encapsulation.

Background technology

The pressing die head pressing mold region that in current encapsulation factory (Assembly house), traditional load uses is closed, cause the tin melted in die cavity, can not well circulate or discharge in closed interval the gas of redundant space, thus cavity or bubble can be produced in die cavity, the defect such as affect the shape after the stability of operation, pressing mold and tin is thick.

The method of current encapsulation factory and exhaust thick at process coined shape, tin, is mainly used as the flowing of tin and the method (see Fig. 1) of exhaust in the mode of the inner connectivity slot of pressing die head die cavity.

And adopt the mode of communication groove in die cavity to have following shortcoming:

1, still cannot solve the thickness problem of effective pressing mold region shape disunity and the effective area caused because tin amount is different during pressing mold at all;

2, because communication groove is narrower, have residual tin and be retained in pressing die head die cavity, the quality influence of secondary pollution may be had subsequent job;

3, limitation is comparatively large, just cannot use this design (because the processing dimension of pressing die head groove is too little, cannot manufacture the design of fluting around die cavity) for less chip;

4, the slot machining difficulty be communicated with in die cavity is comparatively large and technique is also more complicated, and relative processing cost is higher, and yield is low.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned deficiency, provides a kind of outer wall stream guidance pressing die head structure, and it can in order to need to use, the product of stamping technique provides steadily, the ability of safety, convenience and automated production.

The purpose of this utility model is achieved in that a kind of outer wall stream guidance pressing die head structure, it comprises inner center pattern and peripheral pressing mold wall, pattern four side, described center is provided with pressure tin step, described pressing mold wall both sides or corner offer stream guidance groove, and described stream guidance groove is connected with inside center pattern.

Described stream guidance groove is taper.

Compared with prior art, the utility model has following beneficial effect:

1, the utility model effectively can solve the pressing die head because of enclosed environment, and in the process of pressure tin, residual air is in the pressing die head of enclosed environment, causes air to discharge and produces empty problem, contributes to the reliability promoting pressing mold load;

2, the utility model can change the shape of air discharge duct according to the difference of chip size, and the quantity etc. of width, degree of depth equidimension and air discharge duct, does not have limitation;

3, its structure of the utility model is simple, and manufacture difficulty is low, easy for installation, does not need other parts of change board, has saved production cost.

4, the utility model center pattern is communicated with the external world by stream guidance groove, by unnecessary tin to outside outflow extrusion type chamber, thus can control the shape of tin and the thickness of tin well.

Accompanying drawing explanation

Fig. 1 is the existing structural representation connecting slot die head.

Fig. 2 is the schematic diagram of a kind of outer wall stream guidance of the utility model pressing die head constructive embodiment one.

Fig. 3 is the schematic diagram of a kind of outer wall stream guidance of the utility model pressing die head constructive embodiment two.

Fig. 4 is the schematic diagram of a kind of outer wall stream guidance of the utility model pressing die head constructive embodiment three.

Fig. 5 is the schematic diagram of a kind of outer wall stream guidance of the utility model pressing die head constructive embodiment four.

Wherein:

Center pattern 1

Center annular groove 2

Surrounding annular groove 3

Pressing mold wall 4

Pressure tin step 5

Stream guidance groove 6.

Embodiment

See Fig. 2 ~ Fig. 5, a kind of outer wall stream guidance of the utility model pressing die head structure, it comprises inner center pattern 1 and peripheral pressing mold wall 4, pattern 1 four side, described center is provided with pressure tin step 5, described pressing mold wall 4 both sides or corner offer stream guidance groove 6, described stream guidance groove 6 is connected with inside center pattern 1, and described stream guidance groove 6 can be designed to taper or other shapes as required.

Main Function Dian center pattern during work, because center pattern is communicated with the external world by stream guidance groove, therefore can air be extruded outside die cavity, thus avoid producing bubble in enclosed environment and cause load cavity, simultaneously can by unnecessary tin to outside outflow extrusion type chamber, also can control the shape of tin well, the phenomenon of the shape of tin and the thickness instability of effective area can not be caused because of the difference of tin amount.

Claims

1. an outer wall stream guidance pressing die head structure, it is characterized in that: it comprises inner center pattern (1) and peripheral pressing mold wall (4), described center pattern (1) four side is provided with pressure tin step (5), described pressing mold wall (4) both sides or corner offer stream guidance groove (6), and described stream guidance groove (6) is connected with inside center pattern (1).

2. a kind of outer wall stream guidance pressing die head structure according to claim 1, is characterized in that: described stream guidance groove (6) is taper.