Tooth-shaped insert for packaging lead frame

Abstract

The invention discloses a tooth-shaped insert for packaging a lead frame. The tooth-shaped insert comprises an opening groove for inserting a pipe leg of the lead frame, wherein the opening groove comprises a groove bottom (1), groove walls (2) and a groove opening (3); the groove wall and the groove openings are in transition connection by chamfers (4). The tooth-shaped insert for packaging the lead frame has the beneficial effects that the chamfers and C angles are arranged between the groove opening and the groove walls so that the problems that ribbing is difficultly carried out on the placing position of the lead frame, and the spaces between the pipe leg of the lead frame and the groove walls of the opening groove of the tooth-shaped insert are large to cause glue overflowing are solved.

Description

technical field

[0001] The invention relates to a packaging mold, in particular to a tooth-shaped insert for packaging a lead frame. Background technique

[0002] With the continuous development of the technical level, the requirements for the shape, quality, product size, and number of injection molded products are constantly increasing. At the same time, plastic packaging molding defects are always common. Product overflow and beading have been plagued by the entire semiconductor plastic packaging mold industry. Although the precision and processing technology of machine tools have been improved again and again today, the problems of beading and glue overflow have not been effectively solved. After years of experience and technical accumulation, we have roughly summarized the reasons for the overflow of glue and beading as follows:

[0003] The main reasons for overflow glue are:

[0004] ①. Deformation of mold material.

[0005] ②. The value of parting surface height d...

Examples

Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] Such as figure 1 As shown, the present invention includes an open slot for inserting the tube legs of the lead frame, the open slot includes a slot bottom 1 , a slot wall 2 and a slot 3 , and a chamfer 4 transitions between the slot wall and the slot.

[0027] The legs of the lead frame extend into the open groove, the space surrounded by the bottom of the groove and the wall of the groove is suitable for the shape of the lead frame, and the inner diameter of the open groove is slightly larger than the leg of the lead frame for potting and encapsulation, a preferred example of the present invention The edge of the groove wall of the open groove is 0.05mm longer than the leg of the lead frame. In order to prevent the poured glue from overflowing the open groove, a chamfer transition can be provided between the groove wall of the open groove and the notch of the o...

technical field

[0001] The invention relates to a packaging mold, in particular to a tooth-shaped insert for packaging a lead frame. Background technique

[0002] With the continuous development of the technical level, the requirements for the shape, quality, product size, and number of injection molded products are constantly increasing. At the same time, plastic packaging molding defects are always common. Product overflow and beading have been plagued by the entire semiconductor plastic packaging mold industry. Although the precision and processing technology of machine tools have been improved again and again today, the problems of beading and glue overflow have not been effectively solved. After years of experience and technical accumulation, we have roughly summarized the reasons for the overflow of glue and beading as follows:

[0003] The main reasons for overflow glue are:

[0004] ①. Deformation of mold material.

[0005] ②. The value of parting surface height d...

Examples

Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] Such as figure 1 As shown, the present invention includes an open slot for inserting the tube legs of the lead frame, the open slot includes a slot bottom 1 , a slot wall 2 and a slot 3 , and a chamfer 4 transitions between the slot wall and the slot.

[0027] The legs of the lead frame extend into the open groove, the space surrounded by the bottom of the groove and the wall of the groove is suitable for the shape of the lead frame, and the inner diameter of the open groove is slightly larger than the leg of the lead frame for potting and encapsulation, a preferred example of the present invention The edge of the groove wall of the open groove is 0.05mm longer than the leg of the lead frame. In order to prevent the poured glue from overflowing the open groove, a chamfer transition can be provided between the groove wall of the open groove and the notch of the o...

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