JP2565991B2 - Molding equipment for molding hoop-shaped lead frame - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a hoop-shaped lead frame used in the manufacture of semiconductor parts such as ICs and transistors.
The present invention relates to a molding device for molding a thermosetting synthetic resin mold portion for sealing semiconductor elements provided at appropriate intervals in the longitudinal direction.

[Conventional technology]

Conventionally, in order to mold a mold part made of a thermosetting synthetic resin for sealing semiconductor elements provided at appropriate intervals in the longitudinal direction of the hoop-shaped lead frame, the hoop-shaped lead frame is During the intermittent transfer, a lower mold having a plurality of mold part forming cavities formed with recesses and an upper mold having a plurality of mold part forming cavities formed with recesses are appropriately formed. Sandwiched by, by pressing the thermosetting synthetic resin in a molten state in each mold portion molding cavity in the lower mold and the upper mold, to form a plurality of mold portions in the portion of the appropriate length, Then, it is well known that the hoop-shaped lead frame is transferred by the appropriate length and then the molding is repeated.

[Problems to be Solved by the Invention]

However, the lower mold and the upper mold for molding the mold part have, after the molding of the mold part, the inner surfaces of the mold part molding cavities in the upper and lower molds at the time of molding the mold part, and the melt composition. A cleaning process for removing synthetic resin pieces, burrs, and dirt adhering to the inner surface of the runner for guiding the resin, and the mating surfaces of the upper and lower molds, and a thermosetting synthetic resin for the upper and lower molds. A raw material supply step for supplying a raw material tablet is required, and the cleaning step and the raw material supply step cannot be performed before the molding step can be performed.
In other words, since the time required for cleaning and the time required for supplying the raw material tablets are added to the time required for one molding, the molding time for the lead frame per time becomes long. Therefore, the molding speed of the molded part is extremely slow, and the cost for molding the molded part is considerably increased.

Moreover, since the conventional apparatus performs the molding process, the cleaning process, and the raw material supply process on the transfer path of the hoop-shaped lead frame, the molding process is separated from the cleaning process and the raw material supply process in which dust is generated. Therefore, it cannot be done in a clean room.

The present invention aims to improve productivity by overlapping the molding process for the hoop-shaped lead frame and the cleaning process and the raw material supply process for both upper and lower molds, and at the same time, to explain the molding process, the cleaning process and the raw material supply process. An object of the present invention is to provide a molding apparatus which is isolated and can be performed in a clean room.

[Means for solving the problem]

To achieve this object, the present invention provides a rotary base having a rotary shaft core at a part lateral to a transfer path for transferring a hoop-shaped lead frame in the longitudinal direction thereof, and the rotary base has the rotary base. Forming units each including a lower mold and an upper mold for molding the mold portion on the lead frame are provided at both left and right sides of the shaft center, and the rotary base is provided at one end thereof. When the molding unit is located at the location of the lead frame, the other molding unit provided at the other end is located at a location away from the lead frame, and when the other molding unit is located at the location of the lead frame, The molding unit is configured to be swung about the rotation shaft center so as to be located at a position away from the lead frame.

[Functions and effects of the invention]

As described above, the forming units are provided at both ends of the rotary base having the rotary shaft core at a position lateral to the transfer path of the hoop-shaped lead frame, and the rotary base is swiveled around the rotary shaft core. According to this structure, one of the molding units provided at both ends of the rotary base is located at the lead frame,
During molding of the mold portion for the lead frame, the other molding unit is located at a position away from the lead frame. Therefore, the cleaning process and the raw material for the upper and lower molds of the other molding unit are performed. It is possible to overlap the supply step with the one molding unit during the molding step, and the other molding unit of the two molding units is located at the position of the lead frame. During molding of the mold part, since one molding unit is located at a position away from the lead frame, the cleaning process and the raw material supply process are performed on the upper and lower molds of this one molding unit. Can be performed by overlapping during the molding process by the other molding unit. That.

That is, according to the present invention, the molding process for the lead frame and the cleaning process and the raw material supplying process for the upper and lower molds can be overlapped with each other, and the molding time per lead frame can be shortened. The speed of molding the mold portion with respect to the frame is increased, and the cost for molding the mold portion can be significantly reduced.

Moreover, according to the present invention, the molding process for the lead frame, the cleaning process for the upper and lower molds, and the raw material supplying process are performed at separate positions as described above, and the rotation of the rotary base is allowed between them. By providing the partition wall having the openable and closable door, it is possible to perform only the molding process for the lead frame in a clean room in a state separated from the cleaning process for the upper and lower molds and the raw material supply process. is there.

〔Example〕

An embodiment of the present invention will now be described with reference to the drawings. In the drawings, reference numeral 1 indicates a hoop-shaped lead frame that is fed from one reel 2 and wound on the other reel 3 to be transferred in the direction of arrow A. A support shaft 4 is vertically provided upright on the side of the lead frame 1.

Reference numeral 5 denotes a rotary type base which is rotatably fitted to the upper end of the support shaft 4 so that the support shaft 4 serves as a rotary shaft core, and one end of the upper surface of the base 5 has the lead frame 1 Lower die 7a located on the lower side and lead frame 1
A first forming unit 6a including an upper die 8a located above the lower die 7a and configured to be movable up and down toward the lower die 7a, and a hydraulic cylinder 9a for vertically moving the upper die 8a is provided. At the other end of the upper surface of the base 5, the lower mold 7b and the upper mold 8b configured to be movable up and down, like the first forming unit 6a.
And a second molding unit 6b including a hydraulic cylinder 9b for moving the upper mold 8b up and down.

When the first molding unit 6a provided at one end of the board 5 is located at the position of the lead frame 1, the second molding unit 6b provided at the other end is located at a position away from the lead frame 1. When the second molding unit 6b is positioned at the position of the lead frame 1, the first molding unit 6a is swung about the support shaft 4 so that the first molding unit 6a is positioned at a position away from the lead frame 1. ..

In this configuration, when the first molding unit 6a at one end of the rotary base 5 is located at the lead frame 1 and the mold portion is being formed on the lead frame 1, the rotary base 5 Since the second molding unit 6b at the other end is located at a position away from the lead frame 1, the cleaning process and the raw material supply process for the upper and lower molds 7b and 8b in the second molding unit 6b are performed by the first molding unit 6b. This can be performed by overlapping during the molding process for the lead frame 1 by the first molding unit 6a.

Then, when the rotary base 5 is rotated 180 degrees, the first molding unit 6a at one end of the rotary base 5 is moved to the lead frame 1
While the second molding unit 6b at the other end is located at a more distant site, the second molding unit 6b can mold the lead frame 1 at the second molding unit 6b. During the molding process by the second molding unit 6b, the cleaning process and the raw material supply process for the upper and lower molds 7a, 8a in the first molding unit 6a can be performed in an overlapping manner.

Further, reference numeral 10 indicates a partition wall for partitioning the part for performing the molding process and the part for performing the cleaning process and the raw material supply process. The opening 11 is provided, and the opening 11 is closed by the doors 12 and 13 configured to be openable and closable as shown by the double-dashed line arrows B and C, so that the location where the molding step is performed is the cleaning step and the raw material supply. It will be constructed in a clean room that is isolated from the place where the process is performed.

[Brief description of drawings]

1 shows a plan view, FIG. 2 is a II-II side view of FIG. 1, and FIG. 3 is a III-III side view of FIG. 1 ... lead frame, 2,3 ... reel for lead frame, 4 ... support shaft, 5 ... rotary base 5,6
a, 6b …… Molding unit, 7a, 7b …… Lower mold, 8a, 8b …… Upper mold, 9a, 9b …… Hydraulic cylinder, 10 …… Bulk wall, 12,13 ……
door.

Claims (1)

(57) [Claims] 1. A rotary base having a rotary shaft core is provided at a position lateral to a transfer path for transferring a hoop-shaped lead frame in the longitudinal direction, and the rotary base is sandwiched between the rotary bases. Forming units, each of which includes a lower mold and an upper mold for molding a mold portion on the lead frame, are provided at the left and right ends, respectively, and one of the molding units provided with the rotary base at one end is the lead. When located at the location of the frame, the other molding unit provided at the other end is located at a location away from the lead frame, and when the other molding unit is located at the location of the lead frame,
A molding device for a molding portion for a hoop-shaped lead frame, wherein one molding unit is pivotally operated about the rotary shaft center so as to be located at a position away from the lead frame.