CN205009445U - Inside water conservancy diversion exhaust formula moulding -die head structure - Google Patents
Inside water conservancy diversion exhaust formula moulding -die head structure Download PDFInfo
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- CN205009445U CN205009445U CN201520645003.0U CN201520645003U CN205009445U CN 205009445 U CN205009445 U CN 205009445U CN 201520645003 U CN201520645003 U CN 201520645003U CN 205009445 U CN205009445 U CN 205009445U
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Abstract
The utility model relates to an inside water conservancy diversion exhaust formula moulding -die head structure belongs to the semiconductor packaging technology field. It is including inside central pattern (1) and peripheral moulding -die wall (4), be provided with annular (2) all around between center pattern (1) and the peripheral moulding -die wall (4), (1) four side in the center pattern is provided with presses tin step (5), press tin step (5) four corners and seted up ramp type water conservancy diversion air discharge duct (6), ramp type water conservancy diversion air discharge duct (6) and inside central pattern (1) and all around annular (2) be linked together, center pattern (1) center is provided with center exhaust hole (7), a plurality of outer walls exhaust hole (8) has evenly been seted up on peripheral moulding -die wall (4). The utility model relates to an inside water conservancy diversion exhaust formula moulding -die head structure, it can use the product of moulding -die technology to provide steadily for needs, safety, convenience and automated production's ability.
Description
Technical field
The utility model relates to a kind of internal diversion exhaust pressing die head structure, belongs to technical field of semiconductor encapsulation.
Background technology
The inner die cavity of pressing die head that current encapsulation factory (Assemblyhouse) tradition uses is closed, and the pressing die head closed is unfavorable for that the tin melted circulates smoothly in die cavity, also the gas of redundant space in closed interval is difficult to be discharged, thus the tin in die cavity can be made not fill up produce cavity or bubble phenomenon, thus produce that pressing mold operation is unstable, tin shape breach after pressing mold and the defect such as tin thickness ununiformity is even.
The method of current encapsulation factory and exhausting problem thick at process coined shape, tin, mainly adopts communication groove to guide flowing and the exhaust of tin in the untouched pressing die head die cavity inside closed.(see Fig. 1).
And adopt the mode of communication groove in die cavity to have following shortcoming:
1, during pressing mold because inner air is assembled, pressing die head cannot arrive flattens location completely and cause because of tin amount difference make the tin of effective pressing mold region shape disunity and effective area in uneven thickness problem;
2, because the groove of guide effect is narrower and be flat, during pressing mold tin cannot flow to normally corner and product load time chip corner produce cavity, during follow-up encapsulating, plastic packaging material can pierce in the cavity of chip corner, thus causes chip rupture due to unequal power distribution;
3, limitation is comparatively large, is not suitable for longer chip (because tin amount is uneven, cannot be full of corner completely).
Summary of the invention
The purpose of this utility model is to overcome above-mentioned deficiency, provides a kind of internal diversion exhaust pressing die head structure, and it can in order to need to use, the product of stamping technique provides steadily, the moldability of safety, convenience and automated production.
The purpose of this utility model is achieved in that a kind of internal diversion exhaust pressing die head structure, it comprises inner center pattern and peripheral pressing mold wall, surrounding annular groove is provided with between described center pattern and peripheral pressing mold wall, pattern four side, described center is provided with pressure tin step, described pressure tin step corner offers ramp type stream guidance groove, described ramp type stream guidance groove is connected with surrounding annular groove with inside center pattern, described center pattern center is provided with central exhaust port, and described peripheral pressing mold wall evenly offers multiple outer wall steam vent.
The degree of depth of described center pattern is 0.02 ~ 0.06mm.
The degree of depth of described pressure tin step is 0.01 ~ 0.045mm.
The degree of depth of described surrounding annular groove is 0.1 ~ 0.3mm.
The ramp slope of described ramp type stream guidance groove is 1 ~ 5 °.
Described a kind of internal diversion adds exhaust pressure die head outside can add coating (coating material is diamond nano coating), increases pressing die head surface flatness and case hardness, increases in pressing die head life-span and operation and does not make residual tin be retained on pressing die head working face.
Compared with prior art, the utility model has following beneficial effect:
1, pressing die head residual air in pressure tin process that the utility model effectively can solve enclosed environment, in the problem of pressing die head, avoids the generation of cavity, bubble, contributes to the quality and reliability promoting pressing mold load;
2, whole pressing die head is provided with central exhaust port and outer wall steam vent, and being evenly distributed and disperseing of steam vent, can discharge the air in die cavity better smoothly, ensures the even of pressing mold district tin amount, thus tin quality in management and control better;
3, the design of ramp type stream guidance groove, can effectively guide tin to flow into pressing die head corner during pressing mold, in management and control, tin pattern and tin distribute better, avoid chip corner not have tin and the unbalanced stress that causes weighs problem;
4, the utility model can change quantity, spacing, the size of steam vent according to the difference of chip size, thus goes for needles of various sizes chip, and flexibility is larger;
5, its structure of the utility model is simple, and manufacture difficulty is low, easy for installation, does not need other parts of change board, does not increase its production cost and more stable.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing gang mould formula pressing die head.
Fig. 2 is the schematic diagram of a kind of internal diversion exhaust of the utility model pressing die head structure.
Wherein:
Center pattern 1
Surrounding annular groove 2
Outside annular groove 3
Peripheral pressing mold wall 4
Pressure tin step 5
Ramp type stream guidance groove 6
Central exhaust port 7
Outer wall steam vent 8.
Detailed description of the invention
See Fig. 2, a kind of internal diversion exhaust of the utility model pressing die head structure, it comprises inner center pattern 1 and peripheral pressing mold wall 4, surrounding annular groove 2 is provided with between described center pattern 1 and peripheral pressing mold wall 4, pattern 1 four side, described center is provided with pressure tin step 5, described 5 four jiaos, pressure tin step offers ramp type stream guidance groove 6, described ramp type stream guidance groove 6 is connected with surrounding annular groove 2 with inside center pattern 1, pattern 1 center, described center is provided with central exhaust port 7, and described peripheral pressing mold wall 4 evenly offers multiple outer wall steam vent 8.
The degree of depth of described center pattern 1 is 0.02 ~ 0.06mm, and the degree of depth of described pressure tin step 5 is 0.01 ~ 0.045mm, and the degree of depth of described surrounding annular groove 2 is 0.1 ~ 0.3mm, and the ramp slope of described ramp type stream guidance groove 6 is 1 ~ 5 °.
Main Function Dian center pattern during pressure tin, because center pattern is come round by central exhaust port, outer wall steam vent and the external world, in pressure tin process, air can not remain in enclosed environment and produces bubble thus cause load cavity, simultaneously because center pattern is communicated with surrounding annular groove by ramp type stream guidance groove, unnecessary tin can extrude center area of the pattern to outflow, the shape of tin can be controlled 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 (5)
1. an internal diversion exhaust pressing die head structure, it is characterized in that: it comprises inner center pattern (1) and peripheral pressing mold wall (4), surrounding annular groove (2) is provided with between described center pattern (1) and peripheral pressing mold wall (4), described center pattern (1) four side is provided with pressure tin step (5), described pressure tin step (5) corner offers ramp type stream guidance groove (6), described ramp type stream guidance groove (6) is connected with surrounding annular groove (2) with inside center pattern (1), pattern (1) center, described center is provided with central exhaust port (7), described peripheral pressing mold wall (4) evenly offers multiple outer wall steam vent (8).
2. a kind of internal diversion exhaust pressing die head structure according to claim 1, is characterized in that: the degree of depth at described center pattern (1) is 0.02 ~ 0.06mm.
3. a kind of internal diversion exhaust pressing die head structure according to claim 1, is characterized in that: the degree of depth of described pressure tin step (5) is 0.01 ~ 0.045mm.
4. a kind of internal diversion exhaust pressing die head structure according to claim 1, is characterized in that: the degree of depth of described surrounding annular groove (2) is 0.1 ~ 0.3mm.
5. a kind of internal diversion exhaust pressing die head structure according to claim 1, is characterized in that: the ramp slope of described ramp type stream guidance groove (6) is 1 ~ 5 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520645003.0U CN205009445U (en) | 2015-08-25 | 2015-08-25 | Inside water conservancy diversion exhaust formula moulding -die head structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520645003.0U CN205009445U (en) | 2015-08-25 | 2015-08-25 | Inside water conservancy diversion exhaust formula moulding -die head structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205009445U true CN205009445U (en) | 2016-02-03 |
Family
ID=55208070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520645003.0U Active CN205009445U (en) | 2015-08-25 | 2015-08-25 | Inside water conservancy diversion exhaust formula moulding -die head structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205009445U (en) |
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2015
- 2015-08-25 CN CN201520645003.0U patent/CN205009445U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |