JPH0756174Y2 - Resin molding equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a resin molding device, and more particularly, to a resin molding device capable of coping with a difference in length of the lead frame or a difference in length of the lead frame due to a difference in model. Regarding

2. Description of the Related Art An electronic component body such as an island for mounting a semiconductor pellet and a lead connected to an electrode of the electronic component body is connected and integrated by a suspension pin or a tie bar. It is manufactured by coating a part of it with resin and covering it, and cutting off and removing the hanging pins and tie bars exposed from the resin.

FIG. 3 is a side sectional view of an essential part showing an example of a resin molding device, in which 1 is a movable pace plate which moves up and down,
2 is a lower mold having a cavity 2a formed on its upper surface, 3 is a squeezing block arranged side by side of the lower mold 2, 4 is a lower mold 2, squeezing block 3 arranged around the lower mold 2, crushing block An end plate for positioning and fixing the block 3 to the base plate 1, 5 is a base plate fixed on the movable base plate 1, 6 is an upper mold having a cavity 6a formed on the lower surface,
Reference numeral 7 denotes an end plate that surrounds the upper mold 6 and positions and fixes the upper mold 6 on the fixed base plate 5.

Reference numeral 8 is a lead frame, and in the illustrated example, the electronic component body and wires for electrically connecting to the leads are omitted. The lower mold 2 supports the middle part of the lead frame 8, and the upper and lower molds 2,
It is sandwiched at 6. The crushing block 3 supports both ends of the lead frame 8, and the distance between the upper mold 6 and the dies is set to be thinner than the thickness of the lead frame 8, and both ends of the lead frame are crushed when the upper and lower molds 2 and 6 collide. Then, it is rolled in the end face direction to eliminate the gap A shown in the drawing, and the end face of the lead frame 8 is crushed and brought into close contact with the step side wall of the block 3.

Thereby, although not shown, the resin injected into the cavities 2a and 6a through the runner and the gate can be prevented from leaking to both ends of the lead frame 8.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the conventional resin molding apparatus, since the crushing block 3 is fixed to the mold 2, if the length of the lead frame 8 varies, the crushing blocks 3 on both ends of the lead frame will be damaged. If the lead frame 8 is short and the length of the lead frame 8 is short, the amount of crushing is small and the void A remains and resin leak prevention is insufficient. If the lead frame 8 is too long, the lead frame 8 is mounted on the crushing block 3 There was a problem that it could not be tightened.

Therefore, the dimensions of the lead frame 8 have to be strictly controlled.

Further, if the shape of both ends of the lead frame 8 is different, the crushing block corresponding to the shape of the lead frame 7 must be replaced, and the mold must be modified every time the model is changed, which makes the work complicated.

In addition, the lead frame with resin leakage has a problem that when a filler having high hardness such as silica is mixed in the resin, the cutting die wears quickly and has a short life.

Means for Solving the Problems The present invention has been proposed for the purpose of solving the above problems, and the lead frame is sandwiched between the cavity portions of a pair of upper and lower molds having a cavity on the abutting surface, and In a resin molding apparatus in which both end portions are crushed by a crushing block arranged adjacent to one mold to prevent resin leakage injected into the cavity and to coat the main part on the lead frame with resin, the crushing blocks are adjacent to each other. (EN) Provided is a resin molding device which is arranged so as to be able to approach and separate from a mold.

Action With the above configuration, since the crushing block can be placed close to and away from the mold, even if the lead frame has a variation in length or a difference in shape, it can be dealt with in a short time by a simple operation, and the resin leaks. Can be prevented.

Embodiment An embodiment of the present invention will be described below with reference to FIG. 1 by applying it to a resin molding apparatus shown in FIG. In the figure, the same reference numerals as those in FIG.

The device of the present invention is characterized in that the crushing block 9 is arranged so that it can be moved closer to and away from the adjacent molds 2, that is, the lead frame 8 can be adjusted in position in the longitudinal direction to cope with variations in the length of the lead frame 8. The position is adjusted so that the void A does not remain.

In order to make the crushing block 9 movable, in the illustrated example, a step portion 2c 'for slidably supporting the crushing block 9 is provided at the side end of the lower mold 2', and this end face is connected to the end plate 4. . As shown in FIG. 2, the crushing block 9 is pressed against the end plate 4 by rotation to press the lower mold 2 '.
The first and second screws 11a and 11b, which are screwed into the first screw 10 and are inserted into the holes 4a and 4b, which penetrate through the both ends in parallel.
The tip portion or the intermediate portion of is squeezed to the crushing block 9, and the crushing block 9 is pulled toward the end plate 4 side by rotation and separated from the lower mold 2 '. 1st, 2nd, 3rd screws
The crushing block 9 is positioned at a desired position by 10, 11a and 11b.

The present invention is not limited to the above-mentioned embodiment, and for example, by inserting a spacer (not shown) between the crushing block 9 and the end plate 4 or the lower mold 2 ',
The crushing block 9 can be positioned with a set of screws.

Also, a long hole is provided in the crushing block 9 in the sliding direction,
A screw hole may be bored in the stepped portion 2c 'and the crushing block 9 may be guided and fixed by a screw.

As described above, according to the present invention, the position of the crushing block can be adjusted according to the length of the lead frame, and the resin leakage can be reliably prevented.

Also, the crushing block can be easily replaced, and the crushing block having a proper shape can be replaced with a crushing block having a different shape at both ends by a simple operation in a short time.

Effect of the Invention As described above, according to the present invention, it is possible to easily cope with variations in the length and shape of the lead frame, and it is possible to perform good resin molding without resin leakage.

[Brief description of drawings]

FIG. 1 is a side sectional view of an essential part showing an embodiment of the present invention, FIG. 2 is a BB sectional view of FIG. 1, and FIG. 3 is a side sectional view of an essential part showing an example of a conventional resin molding apparatus. . 2 '... lower mold, 2a', 6a ... cavity, 6 ... upper mold, 8 ... lead frame, 9 ... crushing block.

Claims (1)

[Scope of utility model registration request] 1. A lead frame is sandwiched between cavity portions of a pair of upper and lower molds having a cavity formed on an abutting surface, and both end portions of the lead frame are crushed by a crushing block disposed adjacent to one mold, In a resin molding apparatus for preventing leakage of resin injected into a cavity and resin-coating a main portion on a lead frame, the crushing block is arranged so as to be capable of being closely spaced from an adjacent die. apparatus.