JP3098384B2 - Cold slag removal equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, in a semiconductor resin sealing device, a pellet on which an element has been formed is fixed on a bed of a lead frame, and a bonding pad on the pellet and a lead frame are wire-bonded to each other. 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. Although it is necessary to remove the cold slag, when the lead frame has a hoop shape, the cold slag is removed as shown in FIGS.
9 to 11 show a hoop-shaped lead frame 1 after resin molding. The lead frame 1 is formed by forming two rows of packages 2 by resin molding. As cold slag, there are a cull 3 and a runner 4 on both sides of the lead frame 1, and the runner 4 has a gate 5. Is continuous. Further, guide holes 6 are arranged in the lead frame 1.

The feed roller 7 shown in FIG. 12 is rotated in the direction of arrow A. As shown in FIG. 13, the feed roller 7 has a guide tooth portion 8 which meshes with the guide hole 6, and A recess 9 is formed to escape the package 2 of the lead frame 1. The feed roller 7 is provided with a pair of holding rollers 10, which rotate in the direction of arrow B. Further, the holding roller 10 is provided with a pressing roller 11 which forms a pair with the feed roller 7 and is displaced at an angle of about 90 °.

As shown in FIG. 12, the lead frame 1 where the cold slag remains remains on the feed roller 7 as shown in FIG.
And between the holding roller 10 and the holding roller 11. The lead frame 1 is rotated by rotating the feed roller 7 with the guide teeth 8 of the feed roller 7 meshing with the guide holes 6, whereby the rollers 7, 10, 1 are rotated.
It is moved while flexing and deforming between the spaces. At this time, since the cold slag travels straight after exiting between the feed roller 7 and the holding roller 10, the cold slag is peeled and removed from the lead frame 1.

[0006]

However, in the above conventional case, the cull 3 and the runner 4 are removed from the cold slag, but the gate 5 is often left as shown in FIG. Subsequent remaining gate 5
Was extremely troublesome. Further, it is considered that the number of packages in the lead frame 1 is further increased to improve the productivity. In this case, it is expected that the number of gates and through gates between the packages will further increase.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to reliably remove cold slag, eliminate post-processing of remaining cold slag, and increase the number of package rows in a lead frame. It is an object of the present invention to provide a cold slag removing device that can contribute to the above-mentioned problem without any trouble.

[0008]

The first means is to remove cold slugs such as culls, runners, gates and through gates from a hoop-shaped lead frame after resin molding. The first means is formed on the lead frame. A feed roller having a guide tooth portion engaged with the guide hole and a concave portion for escaping the package in the lead frame, a holding roller paired with the feed roller and moving with the lead frame interposed therebetween, and a holding roller A press roller that forms a pair with the lead frame to change the direction of the lead frame by a predetermined angle; and a gate that is formed on the feed roller so as to correspond to the gate of the lead frame and that presses and removes the gate with the rotation of the feed roller. Punch part and the feed roller to the feed roller. A punch portion for the through gate formed to correspond to the through gate of the drum and pressing and removing the through gate with the rotation of the feed roller, and a discharge hole formed in the holding roller to discharge the through gate. (Invention of claim 1).

The second means is that, in the first means, each of the gate punch portion and the through gate punch portion has a gap between the lead frame package and the package of 0.03 to 0.03.
It is characterized in that it is provided to be 0.05 mm (the invention of claim 2).

The third means is characterized in that, in the first means, a ventilation path for air blow is formed in the feed roller so that dust is sucked from a discharge hole (the invention of claim 3). The fourth means is characterized in that in the first means, a laser hole is formed in the feed roller so as to communicate with the recess from the outside (the invention of claim 4).

[0011]

In the first means, a gate punch portion is formed on the feed roller so as to correspond to the gate of the lead frame, and a punch gate portion is formed so as to correspond to the through gate of the lead frame. Since the gate and the through gate are pressed and removed by the gate punch and the through gate punch with the rotation of the feed roller, the gate and the through gate can be reliably removed from the lead frame. In addition, since the holding roller is formed with a discharge hole for discharging the through gate, the through gate separated and removed from the cull and the gate can be satisfactorily discharged.

In the second means, the gate punch portion and the through gate punch portion are provided so that the gap between the lead frame and the package is 0.03-0.05 mm. When the through gate is pressed by the gate punch portion and the through gate punch portion, the through gate is reliably cut off from the package.

In the third means, a ventilation path for air blow is formed in the feed roller so that dust is sucked from the discharge hole, so that a cold slag strip including a through gate at the time of removing the cold slag and the like is provided. Garbage can be collected well.

In the fourth means, a laser hole is formed in the feed roller so as to communicate with the recess from the outside. When the cold slag is removed, the package may be irradiated with a laser through the laser hole to make a mark. It becomes possible.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. FIGS. 2 and 3 show a hoop-shaped lead frame 2 after resin molding.
1 is shown. The lead frame 21 is provided with four rows of pellets (not shown), each of which is surrounded by a package 22 provided by resin molding. In this case, the cold slug formed by the resin mold includes a cull 23 and a runner 24 on both sides of the lead frame 21.
4, a gate 25 is continuous, and further, through gates 26 are continuous between the upper packages 22 in FIG. 2 and between the lower packages 22 in FIG.
Further, guide holes 27 are arranged in the lead frame 21.

Next, in FIG. 1, the feed roller 28 is rotated in the direction of arrow A. As shown in FIGS. 4 to 6, the feed roller 28 has a guide tooth portion 29 which meshes with the guide hole 27. In addition, a recess 30 is formed to escape the package 22 of the lead frame 21. Further, a gate punch 31 is formed on the feed roller 28 so as to correspond to the gate 25 of the lead frame 21, and a through gate punch 32 is formed so as to correspond to the through gate 26. ing. In this case, as shown in FIG. 5, the punch 31 for the gate and the punch 32 for the through gate are respectively connected to the package 2 of the lead frame 21.
2 are provided so that the gaps La and Lb between them are 0.03 to 0.05 mm.

The feed roller 28 is provided with a pair of holding rollers 33, which rotate in the direction of arrow B. The holding roller 33 has a discharge space portion 33a formed at the center thereof, and is rotatably supported via a substantially cross-shaped shaft support member. The discharge space 33a communicates with the outside by the shaft support member 34 having a substantially cross shape. Further, a discharge hole 35 is formed in the holding roller 33 in the radial direction so as to face the through gate 32. The discharge hole 35 communicates with the discharge space 33a. The holding roller 33 is provided with a pressing roller 36 which forms a pair with the feed roller 28 and is shifted at an angle of about 90 °.

The operation of the above configuration will be described. Cal 2
3, runner 24, gate 25 and through gate 26
Lead frame 21 with cold slag remaining
1 is passed between the feed roller 28 and the holding roller 33 and between the holding roller 33 and the pressing roller 36 as shown in FIG. The lead frame 21 is provided with the feed roller 2 in the guide hole 27.
8 are meshed with each other and the feed roller 28 is rotated, whereby the rollers 28, 33, and 36 are rotated.
It is moved while flexing and deforming the space.

In this case, when the lead frame 21 passes between the feed roller 28 and the holding roller 33, the gate 25 and the through gate 26 are formed by the gate punch 31 and the through gate punch 32 as shown in FIG. It is peeled off so as to be punched. The through gate 26 removed here passes through the discharge hole 35, exits to the discharge space 33a, and is discharged from the space 33a to the outside.

After leaving the space between the feed roller 28 and the holding roller 33, the lead frame 21
In this case, the cold slugs such as the cull 23, the runner 24, and the gate 25, which are separated from the lead frame 21, go straight, so that the cold slugs are separated and removed from the lead frame 21.

In this embodiment, the gate punch 31 is formed on the feed roller 28 so as to correspond to the gate 25 of the lead frame 21, and the feeder 28 is formed so as to correspond to the through gate 26 of the lead frame 21. Since the through-gate punch portion 32 is formed, and the gate 25 and the through-gate 26 are pressed and removed by the gate punch portion 31 and the through-gate punch portion 32 with the rotation of the feed roller 28, respectively, The gate 25 and the through gate 26 can be reliably removed from the lead frame 21, and the discharge hole 35 for discharging the through gate 26 to the holding roller 33.
Is formed, the through gate 26 separated from the cull 23 and the gate 25 can be satisfactorily discharged without being left on the holding roller 33.

Therefore, the removal of the remaining gates and the remaining through gates can be omitted, and as a result, even if the number of package rows in the lead frame 21 is further increased, the remaining gates and through gates can be reliably eliminated, thereby improving the productivity. Improvement can be achieved.

In particular, according to the present embodiment, each of the gate punch 31 and the through gate punch 32 has a gap of 0.03 between the lead frame 21 and the package 22.
Since the gate 25 and the through gate 26 are provided so as to be
Also, when pressed by the through gate punch portion 32, the package 22 can be reliably cut.

FIG. 6 shows a second embodiment of the present invention. In this embodiment, the feed roller 28
The air passage 41 for air blow is formed in the
Compressed air is sent through the outlet 1 and the compressed air is released from the discharge hole 35 so that dust is absorbed through the discharge hole 35. According to the second embodiment, it is possible to satisfactorily collect dust such as cold slag strips including the through gate 26 when removing the cold slag.

FIG. 7 shows a third embodiment of the present invention. In this embodiment, the feed roller 28
A laser hole 51 communicating from the outside is formed in the recess 30. According to this, it is also possible to irradiate the package 22 with a laser through the laser hole 51 to make a mark when the cold slag is removed.

It should be noted that the lead frame is not limited to the lead frame 21 of the first embodiment, but may be as shown in FIG. 8 shown as a fourth embodiment of the present invention. In this embodiment, the lead frames 61 and 62 are arranged and moved in two rows, and the guide holes 6 of the respective lead frames 61 and 62 are moved.
3, 64, gates 65, 66, through gates 67, 68
A guide tooth portion, a gate punch portion, a through gate punch portion, and the like may be formed corresponding to the above. Further, the angle of the pressing roller 36 with respect to the holding roller 33 is not limited to 90 °, but may be 60 ° or an angle in the range of 60 ° to 90 °.

[0027]

As apparent from the above description, the present invention has the following effects. According to the invention of claim 1, a gate punch portion is formed on the feed roller so as to correspond to the gate of the lead frame, and a through gate punch portion is formed so as to correspond to the through gate of the lead frame. With the gate punch portion and the through gate punch portion with the rotation of the feed roller, the gate and the through gate are pressed and removed, respectively, so that the gate and the through gate can be reliably removed from the lead frame, and Since the discharge hole for discharging the through gate is formed in the holding roller, the through gate separated and removed from the cull and the gate can be discharged favorably.

Therefore, the removal of the remaining gates and the remaining through gates can be made unnecessary. As a result, even if the number of packages in the lead frame is further increased, the remaining gates and through gates can be reliably eliminated, thereby improving the productivity. Can be achieved.

According to the second aspect of the present invention, the gap between the gate punch and the through gate punch is 0.03 to 0.05 mm between the lead frame and the package.
Therefore, when the gate and the through gate are pressed by the gate punch portion and the through gate punch portion, the gate and the through gate are reliably cut off from the package.

According to the third aspect of the present invention, the feed roller is provided with an air passage for air blow so that dust is sucked from the discharge hole, so that the cold slug including the through gate can be removed when the cold slug is removed. It is possible to satisfactorily collect waste such as pieces.

According to the fourth aspect of the present invention, since the laser hole is formed in the feed roller so as to communicate with the recess from the outside, the package is irradiated with the laser through the laser hole to remove the cold slag, thereby marking the package. It is also possible.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment of the present invention.

FIG. 2 is a partial plan view of a lead frame in a resin molded state.

FIG. 3 is a longitudinal sectional side view of the lead frame in the same state.

FIG. 4 is a longitudinal sectional side view of a main part for explaining operation.

FIG. 5 is an enlarged vertical sectional side view of a punch portion for a through gate.

FIG. 6 is a view corresponding to FIG. 4, showing a second embodiment of the present invention;

FIG. 7 is a view corresponding to FIG. 4, showing a third embodiment of the present invention;

FIG. 8 is a view corresponding to FIG. 2, showing a fourth embodiment of the present invention;

FIG. 9 is a partial plan view of a lead frame in a resin mold state showing a conventional example.

FIG. 10 is a diagram corresponding to FIG. 2 showing a conventional example.

FIG. 11 is a diagram corresponding to FIG. 3 showing a conventional example.

FIG. 12 is a diagram corresponding to FIG. 1 showing a conventional example.

FIG. 13 is a diagram corresponding to FIG. 4 showing a conventional example.

FIG. 14 is a plan view of the lead frame showing a state in which the cold slag remains.

[Explanation of symbols]

21 is a lead frame, 22 is a package, 23 is a cull, 24 is a runner, 25 is a gate, 26 is a through gate, 27 is a guide hole, 28 is a feed roller, 29 is a guide tooth, 30 is a recess, and 31 is a gate. Punch part, 32
Denotes a punch portion for a through gate, 33 denotes a holding roller, 35 denotes a discharge hole portion, 36 denotes a pressing roller, 41 denotes a ventilation path, and 51 denotes a laser hole portion.

Claims (4)

(57) [Claims] An apparatus for removing cold slugs such as culls, runners, gates, and through gates from a hoop-shaped lead frame after resin molding, the guide frame having guide teeth engaging with guide holes formed in the lead frame. A feed roller having a concave portion for escaping the package in the lead frame, a holding roller paired with the feed roller and moving the lead frame therebetween, and forming a pair with the holding roller and forming the lead frame at a predetermined angle. A pressing roller for changing direction, a gate punch portion formed on the feed roller so as to correspond to the gate of the lead frame, and pressing the gate with the rotation of the feed roller to remove the gate; Compatible with lead gate of through frame And a punching portion for the through gate, which is formed so as to press and remove the through gate with the rotation of the feed roller, and a discharge hole formed in the holding roller to discharge the through gate. Slag removal device. 2. The gate punch portion and the through gate punch portion are provided such that a gap between the lead frame and the package is 0.03 to 0.05 mm. Cold slag removal equipment. 3. The cold slag removing device according to claim 1, wherein a ventilation path for air blow is formed in the feed roller, and dust is sucked from a discharge hole. 4. The cold slag removing device according to claim 1, wherein the feed roller has a laser hole communicating with the outside from the concave portion.