JP3165236B2 - 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 resin sealing portion formed by sealing a chip portion provided on a lead frame with a resin.
The present invention relates to a cold slag removing device for removing unnecessary resin such as culls, runners and gates, that is, so-called cold slag.

[0002]

2. Description of the Related Art Generally, in sealing a chip portion provided on a lead frame with a resin, the chip portion is housed in a cavity of a molding die, and a resin is injected from a pot through a runner portion and a gate portion. That is being done. Therefore, unnecessary resin such as cull, runner, and gate are attached to the resin sealing portion corresponding to the cavity, and the unnecessary resin is removed from the resin sealing portion to form a predetermined container, for example, a waste box. It is necessary to discharge to etc.

Conventionally, in order to remove unnecessary resin from a resin sealing portion, a cold slag removing device disclosed in Japanese Patent Publication No. 3-18337 is used to press an unnecessary resin portion while supporting a lead frame. Then, it falls down. Further, in order to discharge the unnecessary resin to a waste box or the like, a waste box is disposed below the cold slag removing device, and the unnecessary resin is directly discharged into the waste box or discharged through a chute or the like. Like that.

[0004]

However, in the apparatus disclosed in Japanese Patent Publication No. 18337/1991, the unnecessary resin is separated from the resin sealing portion while the runner and the gate are connected to each other. Is done.

As a result, when discharging the unnecessary resin into the waste box, it is necessary to make the opening of the waste box relatively large.
When discharging into the waste box through the chute, it is necessary to increase the opening of the chute and the bending radius of the chute, and thus the chute and the waste box become large.
Moreover, when the runner and the gate are connected to the cull, the space formed between the unnecessary resins in the waste box becomes large, and the amount of unnecessary resin that can be accommodated in the waste box becomes small. Therefore, the trash box needs to be replaced frequently, and the productivity is reduced.

In sealing a chip portion with a resin, a resin is supplied from one pot to a plurality of cavities. As shown in FIGS. 3 and 4, in the molded article A thus formed, for example, lead frames C, C are arranged on both sides of a cull B, and a plurality of resin sealing portions are respectively provided on the lead frame C. D is formed, and a gate E and a runner F are formed between each resin sealing portion D and the cull B.
To be connected.

Accordingly, when the unnecessary resin is removed by the apparatus disclosed in Japanese Patent Publication No. 18337/1991, the four runners F and the gate E are connected to the cull B. The length dimension α of the unnecessary resin is greatly increased. As a result, the situation that the chute and the waste box are enlarged and the productivity is reduced becomes more remarkable.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to perform an operation of discharging unnecessary resin into a waste box even if a relatively small chute and waste box are applied. It is another object of the present invention to provide a cold slag removing apparatus which can reduce the number of times of replacing the waste box.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a cold slug removing apparatus for removing a cold slug such as a cull, a runner, and a gate from a resin sealing portion formed by resin sealing a chip portion provided on a lead frame. A cull support for supporting the cull from below is provided, a leadframe support for supporting the leadframe from below is provided, and a discharge section is provided on the leadframe support below the gate and the runner, Oyo said runner particular based on pressing the runner downward by and its movement can be moved in the vertical direction with respect to the lead frame support
And the gate are separated from the cull and the resin sealing part.
The present invention is characterized in that a pressing member for discharging from the discharge section is provided.

[0010]

According to the above means, the lead frame is mounted on the lead frame support, pressed and moved push member is downward in a state where Cal is placed on local support Then, runner downwardly by the pressing member Is done. Then, the gate of the cold slag is separated from the resin sealing portion, and the runner is separated from the cull and discharged from the discharge portion.

That is, unlike the conventional method, in which the cold slug is discharged while the runner and the gate are connected to the cull, the cold slag can be discharged in a state where the runner and the gate are separated from the cull. Dimensions can be reduced. As a result, even if the opening of the waste box and the chute and the bending radius of the chute are reduced, the operation of discharging the cold slag into the waste box can be performed without any trouble. The space formed can be reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

First, in FIG. 1, reference numerals 1, 1 denote lead frame supports for supporting the lead frames C, C from below. 1a are formed, and cut-out discharge portions 1b, 1b are located below the gate E and the runner F.
Are formed, and positioning pins 2 and 2 are protruded at the corners.

In this case, as shown in FIG. 3, the lead frames C, C have pressing member insertion holes G corresponding to the respective runners F.
Are formed, and positioning holes H, H are formed at the corners. When the positioning holes H, H are inserted into the positioning pins 2, 2 as shown in FIG. 1, the resin sealing portions D, D fit into the recesses 1a, 1a, and the lead frames C, C are connected to the lead frame support. It is supported from below by 1,1.

The lead frame supports 1, 1 are provided on a transfer device (not shown). The lead frame supports 1, 1 are provided with an automatic transfer molding device (not shown) for sealing the chip portion with resin. ) Receives the article from
The transport device operates to transport the lead frame supports 1, 1 to the cold slag removing device.

A cull support 3 is provided between the lead frame supports 1 and 1. The cull support 3 is for supporting the cull B from below, and supports a portion near the runner F. The cull support 3 is connected to an actuator (not shown) for driving the cull support via a rod 4 and moves up and down with the operation of the actuator for driving the cull support.

Above the cull support 3 is an upper cull support 5
Is provided. The upper cull support 5 is connected to an upper cull support driving actuator (not shown) via a rod 6.
, And moves up and down with the operation of the actuator for driving the upper cull support, and substantially comes into contact with the upper surface of the cull B as the actuator moves down. A cull extruded body (not shown) movable in a direction perpendicular to the paper surface of FIG. 1 is provided on a side of the cull support 3. Cal support 3 by extruded body
The upper cull B is pressed in the direction perpendicular to the paper surface of FIG.

Above the lead frame supports 1, 1, a removing mechanism 7 is provided. Hereinafter, the removing mechanism 7 will be described.

That is, the mounting plate 8 has an insertion hole 8a formed substantially at the center thereof, and a plurality of pressing members 9 provided on both sides of the insertion hole 8a. 9 is a holding plate 1 joined to the upper surface of the mounting plate 8.
0 prevents the attachment plate 8 from coming off.

The holding plate 10 is formed with an insertion hole 10a corresponding to the insertion hole 8a of the mounting plate 8, and the upper cull support 5 and the rod 6 move up and down through the insertion holes 8a, 10a. Further, rods 11 and 11 are attached to the holding plate 10 on the upper surface. Rod 11,
11 is connected to a connecting plate (not shown), which is connected to a removing mechanism driving actuator (not shown). When the removing mechanism driving actuator operates, the pressing member 9 causes the pressing member 9 to move to the lead frame support. The runner F of the molded product A is moved downwardly through the pressing member insertion hole G in accordance with the downward movement.

A waste box (not shown) from which unnecessary resin is discharged is disposed below the discharge portions 1b, 1b of the lead frame supports 1, 1.

Next, the operation of the above configuration will be described.

That is, the molded article A is manufactured by the automatic transfer molding apparatus, and the lead frame supports 1, 1 are manufactured.
When it is set on the upper side, the transfer device operates to transfer the lead frame supports 1, 1 together with the molded product A to the cold slag removing device.

Then, the actuators for driving the cull support and the upper cull support are operated, the cull support 3 is raised, the cull B is supported by the cull support 3 from below, and the upper cull support 5 is lowered. Then, the upper surface of the cull B is pressed by the lower surface of the upper cull support 5.

Next, when the removing mechanism driving actuator is actuated to move the removing mechanism 7 downward, each runner F is pressed by the leading end of the pressing member 9 through the pressing member insertion hole G of the lead frame C. Then, the gate E is separated from the resin sealing portion D as shown in FIG.
Is separated from the cull B, and the separated gate E and runner F are discharged into the waste box through the discharge portion 1b in a connected state.

Thereafter, the cull support, the upper cull support and the actuator for driving the removing mechanism are operated, and the cull support 3 is lowered and the upper cull support 5 and the removing mechanism 7 are raised. The cull B is moved in the direction of the support 3 and pressed in the direction perpendicular to the plane of the paper to drop into the waste box.

According to the above configuration, the following effects can be obtained.

That is, the cull support 3 and the lead frame supports 1 and 1 for supporting the cull B and the lead frame C from below are provided, respectively, and the removing mechanism 7 having the pressing member 9 for pressing the runner F downward is provided. Therefore, the unnecessary resin is discharged in a state where the runner F and the gate E are separated from the cull B.

Therefore, the runner F and the gate E are connected to the cull B.
The length dimension of the unnecessary resin to be discharged can be reduced as compared with the related art in which the unnecessary resin is discharged in a state where is connected. As a result, when the unnecessary resin is directly discharged into the waste box or when discharged through the chute, the work can be performed without any trouble even if the opening of the waste box and the chute and the bending radius of the chute are reduced. It is possible to apply relatively small chutes and waste boxes.

In addition, the unnecessary resin is changed from the cal B to the runner F.
Further, since the gate E is separated, the space formed between the unnecessary resins is smaller than in the conventional case, and the amount of the unnecessary resin that can be accommodated in the waste box becomes larger. as a result,
It is possible to reduce the number of times of replacement of the waste box and improve the productivity.

In particular, in the above embodiment, the cull support 3
Since the upper cull B is configured to be pushed down by the cull extruded body in conjunction with a series of unnecessary resin removing operations, for example, there is no need for the operator to perform the cull B discharging operation, and the productivity can be further improved. .

In the above embodiment, the cull support 3
In order to discharge the upper cull B, a cull extruded body movable in the direction perpendicular to the plane of the paper is provided. For example, the cull support 3 is provided so as to be rotatable relative to the rod 4 in the direction perpendicular to the plane of the paper. By rotating in this direction, the cull B may be dropped.

Further, in the above embodiment, the upper cull support 5 is moved up and down by the upper cull support driving actuator. Can be eliminated and the apparatus can be simplified. That is, the connecting plate to which the rods 11 are connected and the rod 6 are connected by an elastic body such as a spring (not shown), and the upper cull support 5 is moved up and down by the actuator for driving the removing mechanism. To

In the above embodiment, the molded product A
As shown in FIG. 3, the resin sealing portions D are arranged in a line along the longitudinal direction of the lead frame C. However, as is well known, there are various forms of molded products, The configuration of the cold slag removing device may be appropriately changed.

For example, when the resin sealing portions are arranged in two rows along the longitudinal direction of the lead frame and the parallel resin sealing portions are connected to each other via a through gate and a through runner, the following configuration is adopted. . The removing mechanism includes a pressing member that presses the through runner in addition to a pressing member that presses the runner located between the cull and the resin sealing portion.
In addition to the discharge section corresponding to the runner and gate located between the cull and the resin sealing section,
Discharge portions corresponding to through gates and through runners located between the parallel resin sealing portions are provided.

[0036]

As is apparent from the above description, according to the apparatus for removing cold slag of the present invention, the runner is pushed downward.
The runners and gates
Since the pressing member that separates from the resin sealing portion and discharges from the discharge portion is provided, the unnecessary resin can be discharged in a state where the runner and the gate are separated from the cull. as a result,
Even if a relatively small chute and a waste box are used, the operation of discharging the cold slag into the waste box can be performed without any trouble, and the number of times of replacement of the waste box can be reduced, so that productivity can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a main part showing one embodiment of the present invention.

FIG. 2 is a diagram corresponding to FIG. 1 for explaining operation.

FIG. 3 is a top view of a molded product.

FIG. 4 is a side view of a molded product.

[Explanation of symbols]

1 is a lead frame support, 1b is a discharge section, 3 is a cull support , 9 is a pressing member, B is a cull, C is a lead frame,
D indicates a resin sealing portion, E indicates a gate , and F indicates a runner .

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-298054 (JP, A) JP-A-4-330740 (JP, A) JP-A-62-266640 (JP, A) JP-A-61-1986 168230 (JP, A) JP-A-59-88837 (JP, A) JP-A-3-288453 (JP, A) JP-A-62-183532 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01L 21/56

Claims (1)

(57) [Claims] An apparatus for removing a cold slug such as a cull, a runner or a gate from a resin sealing portion formed by resin-sealing a chip portion provided on a lead frame, comprising: a cull support for supporting the cull from below. A lead frame support for supporting the lead frame from below; a discharge unit provided on the lead frame support below the gate and the runner; and a vertical direction with respect to the lead frame support. The runner and the gate are moved by pressing the runner downward by the movement.
Separated from the resin and the resin sealing section and discharged from the discharge section.
A cold slag removing device comprising: a pressing member that projects.