CN203472065U - Jugged insert for encapsulating lead frame - Google Patents
Jugged insert for encapsulating lead frame Download PDFInfo
- Publication number
- CN203472065U CN203472065U CN201320574391.9U CN201320574391U CN203472065U CN 203472065 U CN203472065 U CN 203472065U CN 201320574391 U CN201320574391 U CN 201320574391U CN 203472065 U CN203472065 U CN 203472065U
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- China
- Prior art keywords
- lead frame
- slot
- insert
- notch
- jugged
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- Expired - Fee Related
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Abstract
The utility model discloses a jugged insert for encapsulating a lead frame, comprises an open slot into which pipe legs of the lead frame are inserted, the open slot comprises a slot bottom (1), a slot wall (2) and a slot opening (3), and a chamfer (4) is used as transition between the slot wall and the slot opening. The jugged insert disclosed by the utility model has the beneficial effect that the chamfer and a C angle are arranged between the slot opening and the slot wall to solve the problem that the lead frame difficultly presses ribs in place and excessive glue problem caused by large space between the pipe legs of the lead frame and the slot wall of the open slot of the jugged insert.
Description
Technical field
The utility model relates to a kind of encapsulating mould, relates in particular to the profile of tooth mold insert for encapsulating lead.
Background technology
Along with technical merit development, the requirement of injecting products profile, quality, product size, cave number is improved constantly simultaneously, plastic packaging forming defect is always ubiquitous simultaneously, and overflow glue, beading of product perplexing whole semiconductor plastic package die industry always.Although today machine tool accuracy and process technology improve again and again, beading, the glue problem of overflowing cannot effectively be solved all the time.We have roughly concluded through experience for many years and technological accumulation and have produced the glue that overflows, beading is former because following some:
Overflow collagen because mainly containing:
1.. the distortion of mold materials.
2.. detecting parting surface height poor (impression amount) value is unreasonable.
3.. the maximum clamping pressure that press can provide is less than the necessary mold clamping force of mould.
4.. the support column position of arranging is unreasonable.
5.. support column height value is unreasonable.
6.. client provides that lead frame precision is low to be caused.
Beading reason mainly contains:
1.. during production, mold temperature is unreasonable.
2.. during Design of Dies, line expansion factor is unreasonable.
3.. client provides that lead frame precision is low to be caused.
4.. mould flute profile mold insert machining accuracy is low.
5.. on mould, lead frame pilot pin tolerance is overproof.
6.. the gap that mould flute profile mold insert tooth is given is unreasonable, and it is not smooth that lead frame pipe leg enters position.
In designing mould, for controlling the glue that overflows, to lead frame pipe leg limit, to the monolateral of mould profile of tooth mold insert, be generally 0.05MM, at this moment wait pipe leg and occur beading, lead frame pipe leg is bad on mould profile of tooth mold insert enters position, and we can tune up beading (bad the enter position) problem that solves monolateral spacing.After we tune up gap, beading problem has solved but the glue problem of overflowing has occurred again.
Utility model content
The technical problems to be solved in the utility model is that existing profile of tooth mold insert will there will not be badly to enter position and will there will not be excessive glue, provides a kind of for this reason and can solve the bad profile of tooth mold insert for encapsulating lead that enters position and excessive glue problem of lead frame pipe leg.
The technical solution of the utility model is: for the profile of tooth mold insert of encapsulating lead, it comprises that described open slot comprises bottom land, cell wall and notch for the open slot of the pipe leg insertion of lead frame, passes through chamfering transition between described cell wall and notch.
The improvement of such scheme is between described chamfering and notch, to be provided with the transition of C angle.
Chamfering described in such scheme on cell wall and C angle account for the 1/2-3/5 of cell wall total height.
The beneficial effects of the utility model are to have solved by be provided with chamfering and C angle between notch and cell wall that lead frame enters position difficult beading and lead frame pipe leg and flute profile mold insert open slot cell wall spacing causes greatly the glue problem of overflowing.
Accompanying drawing explanation
Fig. 1 is the utility model schematic diagram;
In figure, 1, bottom land, 2, cell wall, 3, notch, 4, chamfering, 5, C angle.
The specific embodiment
Below in conjunction with accompanying drawing, the utility model is described further.
As shown in Figure 1, the utility model comprises that described open slot comprises bottom land 1, cell wall 2 and notch 3 for the open slot of the pipe leg insertion of lead frame, passes through chamfering 4 transition between described cell wall and notch.
The pipe leg of lead frame stretches in open slot, the space that bottom land and cell wall surround and the shape of lead frame are suitable, the internal diameter of open slot is slightly larger than the pipe leg of lead frame so that encapsulating encapsulation, preference of the present utility model is that the cell wall edge of open slot has more 0.05mm than the pipe leg of lead frame, for not making the glue pouring into, you do not overflow open slot, can between the cell wall of open slot and the notch of open slot, be provided with chamfering transition, for you further guarantee glue, can in open slot, not overflow, can between chamfering and the notch of open slot, be provided with 5 transition of C angle.
The pipe leg that guarantees lead frame for you is firmly encapsulated in open slot, and chamfering and C angle account for 1/2 of total height between bottom land and notch, at this moment between the shared bottom land of cell wall and notch 1/2 of total height.
Another embodiment be chamfering and C angle account for total height between bottom land and notch 3/5, at this moment between the shared bottom land of cell wall and notch 2/5 of total height, although cell wall height has reduced, can exert an influence to the firmness of lead-frame packages, can reduce the encapsulating amount of each lead frame pipe leg.
C angle in the utility model is exactly 45 degree limit chamferings, and the chamfering in the utility model can be that rounded corner can be also non-rounded corner.
By reference to the accompanying drawings the utility model is exemplarily described above; obviously the utility model specific implementation is not subject to the restrictions described above; as long as adopted the improvement of the various unsubstantialities that method of the present utility model design and technical scheme carry out; or without improving, design of the present utility model and technical scheme are directly applied to other occasion, all within protection domain of the present utility model.
Claims (3)
1. for the profile of tooth mold insert of encapsulating lead, it is characterized in that it comprises that described open slot comprises bottom land (1), cell wall (2) and notch (3) for the open slot of the pipe leg insertion of lead frame, passes through chamfering (4) transition between described cell wall and notch.
2. the profile of tooth mold insert for encapsulating lead as claimed in claim 1, is characterized in that being provided with between described chamfering and notch C angle (5) transition.
3. the profile of tooth mold insert for encapsulating lead as claimed in claim 2, is characterized in that the 1/2-3/5 that chamfering on described cell wall and C angle account for total height between bottom land and notch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320574391.9U CN203472065U (en) | 2013-09-17 | 2013-09-17 | Jugged insert for encapsulating lead frame |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320574391.9U CN203472065U (en) | 2013-09-17 | 2013-09-17 | Jugged insert for encapsulating lead frame |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203472065U true CN203472065U (en) | 2014-03-12 |
Family
ID=50220466
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320574391.9U Expired - Fee Related CN203472065U (en) | 2013-09-17 | 2013-09-17 | Jugged insert for encapsulating lead frame |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203472065U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103465441A (en) * | 2013-09-17 | 2013-12-25 | 铜陵建西精密部品有限责任公司 | Tooth-shaped insert for packaging lead frame |
-
2013
- 2013-09-17 CN CN201320574391.9U patent/CN203472065U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103465441A (en) * | 2013-09-17 | 2013-12-25 | 铜陵建西精密部品有限责任公司 | Tooth-shaped insert for packaging lead frame |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140312 Termination date: 20140917 |
|
| EXPY | Termination of patent right or utility model |