JPH0917815A - Cold slug remover - Google Patents

Abstract

PURPOSE: To surely remove cold slug from a lead frame. CONSTITUTION: At a field roller 21, a guide tooth 22 to engage with the guide hole 6 of a lead frame 1 is made, and a recess 23d to escape the package 2 of the lead frame 1 is made. Furthermore, first pressers 24 and 24 and cold slug receivers 25 and 25 are made. At a retaining roller 26 which forms a pair with this field roller 21, a second press part is made, corresponding to the first press parts 24 and 24, and also, a cold slug press part 28 is made.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold slag removing device for removing cold slag from a resin-molded hoop-shaped lead frame.

[0002]

2. Description of the Related Art Conventionally, in a semiconductor resin encapsulation apparatus, after a pellet on which an element has been formed is fixed on a bed of a lead frame, a bonding pad on the pellet and the lead frame are wire-bonded to form an electrical connection. Then, the bonding portion between the pellet and the lead frame is sealed by resin molding.

In this resin mode molding, cold slag of resin remains on the lead frame. It is necessary to remove the cold slug, but in the case where the lead frame has a hoop shape, the cold slug is removed as shown in FIGS. 5 to 7 and 10 to 12. 5 to 7 show the hoop-shaped lead frame 1 after resin molding. This lead frame 1 is 2 by resin molding
A row of packages 2 is formed, and as a cold slug, a cull 3 and a runner 4 are provided on both sides of a lead frame 1, and a gate 5 is connected to the runner 4. Further, guide holes 6 are arranged in a row in the lead frame 1.

10 and 11 show a conventional cold slag removing device. Feed roller 7 is arrow A
It is rotated in the direction, and as shown in FIG. 11, a guide tooth portion 8 that meshes with the guide hole 6 is provided.
And a recess 9 for escaping the package 2 of the lead frame 1 is formed. Further, the feed roller 7 is provided with a holding roller 10 which makes a pair with the feed roller 7 and rotates in the direction of arrow B. Further, the feed roller 7 is paired with the feed roller 7 and has an angle of about 45 ° to 90 °.
The pressing roller 11 is provided with an angular deviation.

However, the lead frame 1 on which the cold slag remains remains as shown in FIG.
And a holding roller 10 and a feed roller 7 and a pressing roller 11. In the lead frame 1, the guide holes 6 of the feed roller 7 are engaged with the guide holes 6 of the lead frame 1 and the feed roller 7 is rotated, whereby the rollers 7, 10, 1
It is moved while flexing and deforming between 1 and 1. At this time, since the cold slug goes straight between the feed roller 7 and the holding roller 10, the cold slag is separated and removed from the lead frame 1.

[0006]

However, in the above-mentioned conventional case, although the cull 3 and the runner 4 are removed from the cold slag, the gate 5 has the reference numerals 5a and 5 in FIG.
As shown by b and 5c, it often remains, and in particular, the gate 5c has an extremely thin film shape, and the subsequent removal process of the residual cold slag is extremely troublesome. The present invention has been made in view of the above circumstances,
It is an object of the present invention to provide a cold slag removing device that can reliably remove cold slag and eliminate post-treatment of residual cold slag.

[0007]

The first means is to remove cold slugs such as culls, runners, gates and through gates from a resin-molded hoop-shaped lead frame, which is formed on the lead frame. A feed roller having a guide tooth portion that meshes with the guide hole and a recess for escaping the package in the lead frame, a holding roller that forms a pair with the feed roller and moves while sandwiching the lead frame, and the holding roller. Alternatively, a pressing roller that is paired with the feed roller and that converts the lead frame in a predetermined angle direction, a first pressing portion that is formed on the feed roller and presses one surface of the lead frame, and the holding roller that has the first 1 corresponding to the pressing portion of the other of the lead frame A second pressing portion for holding said lead frame from both sides by the pressing the first pressing part,
A cold slug pressing portion that is formed on one of the feed roller and the holding roller and that presses the cold slug in a direction in which the cold slug is separated from the lead frame in an inclined state, and formed on the other of the feed roller and the holding roller. It is provided with a cold slag receiving portion which allows peeling of the cold slag from the lead frame (the invention of claim 1).

A second means is characterized in that, in the first means, the cold slug pressing portion is constituted so that the cold slag is inclined at an angle of 20 ° to 25 ° with respect to the lead frame (claim). Invention of Item 2).

A third means is characterized in that, in the first means, the cold slug pressing portion is configured to be separated from the gate of the cold slug (the invention of claim 3). A fourth means is characterized in that, in the first means, the feed roller is located on the side of the lead frame opposite to the gate of the cold slug, and the pressing roller is paired with the feed roller. It has (the invention of claim 4).

[0010]

In the first means, the first pressing portion and the second
Since the lead frame is held from both sides by the pressing portion and the cold slag pressing portion separates the cold slug from the lead frame, the cold slag can be surely removed from the lead frame. Moreover,
Since the cold slug is peeled off in an inclined state after holding the lead frame, no unreasonable force acts on the lead frame and the lead frame is not deformed.

According to the second means, the cold slug pressing portion is provided so that the cold slug is 20 against the lead frame.
Since it is configured to incline at an angle of ° to 25 °, the cold slag can be peeled off more reliably. In the third means, since the cold slag pressing portion is configured to be peeled from the gate of the cold slag, the cold slag can be peeled more reliably. In the fourth means, the feed roller is located on the opposite side of the lead frame from the gate of the cold slug, and the pressing roller forms a pair with the feed roller. Therefore, the cold slug is more reliably peeled off. become able to.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. The feed roller 21 shown in FIG. 4 is rotated in the direction of arrow A. As shown in FIGS. 1 and 2, the feed roller 21 is formed with guide tooth portions 22 that mesh with the guide holes 6 of the lead frame 1. At the same time, a recess 23 is formed so as to escape the package 2 of the lead frame 1. Further, the feed roller 21 is formed with first pressing portions 24, 24 located outside the guide tooth portion 22 and for pressing one surface of the lead frame 1, in this case, the upper surface. Further, cold slug receiving portions 25, 25 are formed on the feed roller 21.

Further, the feed roller 21 is provided with a holding roller 26 paired therewith, which rotates in the direction of arrow B. The holding roller 26 has the first
The second pressing portions 27, 27 for pressing the other surface of the lead frame 1, in this case the lower surface, corresponding to the pressing portions 24, 24 of
Are formed. Further, the holding roller 26 is formed with cold slug pressing portions 28, 28, and further, cold slug escape portions 29, 29 for escaping the cold slag.
Are formed. Further, the holding roller 26 is provided with a pressing roller 30 which is paired with the holding roller 26 and is displaced by an angle of approximately 45 ° to 90 °.

In the above structure, the lead frame 1 having the cold slag remaining therein is passed between the feed roller 21 and the holding roller 26 as shown in FIG. It is passed. In this case, the lead frame 1 is held from both upper and lower surfaces by the first pressing portions 24 of the feed roller 21 and the second pressing portions 27 of the holding roller 26. In addition, the cold slug pushes the runner 4 on the cull 3 side upward by each cold slug pushing portion 28 of the holding roller 26, whereby the cold slug is separated from the gate in an inclined state, and the pushed runner 4 is fed. The cold slug receiving portions 25 of the roller 21 receive and pinch the rollers. The inclination angle at this time is 20 ° to 25 ° with respect to the lead frame 1.

Thereafter, the lead frame 1 is bent and deformed between the rollers 21, 26 and 30 by the guide teeth 6 of the feed roller 21 meshing with the guide hole 6 of the lead frame 1 and the feed roller 21 being rotated. While being moved. At this time, the cold slag is the feed roller 21.
The cold slug is peeled off from the lead frame 1 because it goes straight after passing between the holding rotor 26 and the holding rotor 26.

According to the present embodiment described above, the first pressing portion 24 formed on the feed roller 21 and the holding roller 26.
The lead frame 1 is held from both sides by the second pressing portion 27 formed on the both sides, and the cold slug is peeled off from the lead frame 1 by the cold slug pressing portion 28 formed on the holding roller 26, so that the cold slug is surely secured. It can be removed from the lead frame 1. As a result, the cold slag can be reliably removed, and the post-treatment of the residual cold slag can be eliminated. Moreover, since the cold slug is peeled off in an inclined state after holding the lead frame 1, it is possible to prevent the lead frame 1 from being deformed without an unreasonable force acting on the lead frame 1.

In particular, according to this embodiment, the cold slug pressing portion 28 and the cold slag receiving portion 25 are constructed so that the cold slag is inclined at an angle of 20 ° to 25 ° with respect to the lead frame 1. As a result, the cold slag can be reliably broken off from the lead frame 1 and can be more reliably peeled off. Further, according to the present embodiment, the cold slug pressing portion 28 is provided at the outer end portion of the holding roller 26 so that the cold slag is separated from the gate 5, so that the cold slug is reliably folded at the gate. It can be removed and can be peeled more reliably.

Further, according to this embodiment, the feed roller 21 is located on the side of the lead frame 1 opposite to the gate 5 of the cold slug, and the pressing roller 30 is
Since the structure is paired with the feed roller 21, that is, when the cold slug gate 5 is located below the lead frame 1, the feed roller 21 is located above the lead frame 1 and On the other hand, since the pressing roller 30 constitutes a pair, the lead frame 1 and the cold slug are well separated vertically,
Therefore, the cold slag can be peeled off more reliably. When the cold slug gate 5 is located above the lead frame 1, the feed roller 21 is located on the lower side opposite to the lead frame 1 as shown in FIG. 8 showing a second embodiment of the present invention. It may be configured to be located at.

Next, FIG. 9 shows a third embodiment of the present invention.
In this third embodiment, the cold slug pressing portion 3
1 is formed on the feed roller 21, and the cold slag receiving portion 32 is formed on the holding roller 26, so that the cold slag is peeled from the cull 3 side. According to this embodiment, there is an effect that the peeling force against the cold slag is small.

[0020]

As apparent from the above description, the present invention has the following effects. According to the invention of claim 1, the first pressing portion and the second pressing portion hold the lead frame from both sides, and the cold slug pressing portion separates the cold slag from the lead frame. Can be reliably removed from the lead frame, and post-treatment of residual cold slag can be eliminated. Moreover, since the cold slug is peeled off in an inclined state after holding the lead frame, no unreasonable force acts on the lead frame and the lead frame is not deformed.

According to the second aspect of the present invention, the cold slug pressing portion is provided such that
Since it is configured to incline at an angle of 0 ° to 25 °, the cold slug can be reliably broken off and the cold slug can be more reliably peeled from the lead frame. In the means of claim 3, since the cold slug pressing portion is configured to be peeled from the gate of the cold slug, the cold slug can be peeled from the lead frame more reliably. According to the invention of claim 4, since the feed roller is located on the side opposite to the gate of the cold slug with respect to the lead frame, and the pressing roller forms a pair with the feed roller, the cold slug is lead. The frame can be peeled more reliably.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional front view of essential parts showing a first embodiment of the present invention.

FIG. 2 is a vertical sectional front view of a cold slag peeling portion.

FIG. 3 is a vertical cross-sectional front view of a main part with a lead frame omitted.

FIG. 4 is an overall side view.

FIG. 5 is a plan view of the lead frame.

FIG. 6 is a plan view of the main part of the lead frame.

FIG. 7 is a vertical sectional front view of a main part of the lead frame.

FIG. 8 is a view corresponding to FIG. 4, showing a second embodiment of the present invention.

FIG. 9 is a view corresponding to FIG. 1, showing a third embodiment of the present invention.

FIG. 10 is an overall side view showing a conventional example.

FIG. 11 is a view equivalent to FIG.

FIG. 12 is a partial plan view of the lead frame showing the remaining state of cold slag.

[Explanation of symbols]

Reference numeral 21 is a feed roller, 22 is a guide tooth portion, 23 is a recessed portion, 24 is a first pressing portion, 25 is a cold slug, 26
Is a holding roller, 27 is a second pressing portion, 28 is a cold slag pressing portion, 29 is a cold slug escape portion, 30 is a pressing roller, 31 is a cold slag pressing portion, and 32 is a cold slag receiving portion.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Takekawa 2121 Nobuo, Asahi-cho, Mie-gun, Mie Prefecture

Claims (4)

[Claims] 1. A method for removing cold slugs such as culls, runners, gates, and through gates from a resin-molded hoop-shaped lead frame, which has guide teeth that mesh with guide holes formed in the lead frame. A feed roller having a recess for escaping the package in the lead frame, a holding roller that forms a pair with the feed roller and moves with the lead frame interposed therebetween, and the lead that forms a pair with the holding roller or the feed roller. A pressing roller for converting the frame in a predetermined angle direction, a first pressing portion formed on the feed roller for pressing one surface of the lead frame, and formed on the holding roller corresponding to the first pressing portion. The first pressing portion that presses the other surface of the lead frame And a second pressing portion that holds the lead frame from both sides, and a cold slug pressing portion that is formed on one of the feed roller and the holding roller and presses the cold slug in a direction in which the cold slag is separated from the lead frame in an inclined state. And a cold slag receiving device which is formed on the other of the feed roller and the holding roller and receives cold slag separated from the lead frame. 2. The cold slug pressing portion is configured such that the cold slag inclines at an angle of 20 ° to 25 ° with respect to the lead frame.
Cold slag removal device described. 3. The cold slag removing apparatus according to claim 1, wherein the cold slag pressing portion is configured to separate from the gate of the cold slag. 4. The cold roller according to claim 1, wherein the feed roller is located on a side of the lead frame opposite to the gate of the cold slug, and the pressing roller is configured to be paired with the feed roller. Slag removal device.