JP3018832B2 - Cal separation 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 cull separating apparatus for separating cull remaining on a lead frame from a lead frame when a molded body for protecting a chip on the lead frame is formed. It is.

[0002]

2. Description of the Related Art For electronic components, after a chip cut from a wafer is mounted on an island of a lead frame, a molded body for protecting the chip is formed by a resin molding apparatus, and then the lead of the lead frame is punched and formed. It is manufactured by doing.

FIG. 8 is a sectional view of a conventional lead frame in which a molded body is formed by the above-described resin molding apparatus.
A chip 3 is mounted on the island 2 of the lead frame 1, and a molded body 4 for protecting the chip 3 is formed.

The resin molding apparatus positions the lead frame 1 between the upper mold and the lower mold. In this state, the resin heated by the heater and melted in the pot is passed through a thin runner into a cavity surrounding the chip 3. Then, the resin filled in the cavity is cured to form the mold body 4.

[0005] In Fig. 8, reference numeral 5a denotes a solid resin remaining in the pot and cured, and 5b denotes a rod-shaped resin remaining in the runner and cured. Such a lump resin 5a or a rod-like resin 5b
Is generally called Cal 5.

[0006] The cull 5 which is a residual cured product of such a molten resin is an unnecessary substance and must be separated and removed from the lead frame 1. Therefore, conventionally, in FIG.
Is pressed in the direction of the arrow to force the bar-shaped resin 5b adhered to the lower surface of the lead frame 1 from the lead frame 1 to separate the cull 5 from the lead frame 1 (see a chain line in the figure). As such a cull separating apparatus, for example, one described in Japanese Utility Model Laid-Open No. 2-79032 is known.

By the way, as shown in FIG. 7, it is known that two molded bodies 4 are formed side by side on a lead frame 6 having a relatively large width. In this case, the runner is long, and accordingly, the rod-shaped resin 5b is also long, and adheres to the lower surface of the lead frame 6 more strongly than that shown in FIG.

If the cull 5 is pressed in the direction of the arrow similarly to the case of FIG. 8 to separate the cull 5 from the lead frame, the adhesion of the bar-shaped resin 5b to the lead frame 6 is shown in FIG. Bar-shaped resin 5
6B cannot be easily separated from the lead frame 6, and is broken near the side end of the lead frame 6 shown by a in FIG. 6, and the rod-shaped resin 5 b remains attached to the lower surface of the lead frame 6. Become.

Conventionally, as shown in FIG. 7, separation of the cull 5 from the lead frame 6 in which a plurality of mold bodies 4 are formed side by side is performed manually by an operator using a pin or the like. It was in fact.

[0010]

However, the work efficiency is not improved by the manual separation, and when the separation operation is performed while holding the lead frame 6 in the hand and operating the pins, the pins are not connected to the lead frame 6. There is a problem that the lead is easily damaged by hitting the lead or bending the lead frame 6.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a cull separating apparatus capable of automatically and surely separating cull from a lead frame even when the stick-like resin is long and adheres to the lead frame and the adhesive force is large. And

[0012]

SUMMARY OF THE INVENTION To this end, the present invention provides a transfer means for transferring a lead frame on which a molded body is formed, a base on which the lead frame transferred by the transfer means is mounted, and A grounding member provided on the base and having a side end of the lead frame grounded, a pressing member for pressing the lead frame against the grounding member from above to bend and deform, and a vertical moving means for causing the pressing member to perform a vertical operation , A peeler that moves forward between the lower surface of the lead frame and the cull attached to the lower surface, and a power separating means that causes the peeler to perform a forward and backward operation.

[0013]

In the above construction, the lead frame is placed on the base, the lead frame is pressed by the pressing element to bend the lead frame, and then the exfoliator is advanced between the lead frame and the cull. In this case, the cull can be reliably separated from the lead frame by the peeler.

[0014]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a bottom view of a lead frame on which a molded body is formed by a resin forming apparatus according to one embodiment of the present invention. This lead frame 6 is the same as that shown in FIG. 7. The chip 3 is mounted on the island 2, and the chip 3 is protected by the mold 4.
Further, there are two lead frames 6 on the left and right, and a bar-shaped resin 5b extending from the bulk resin 5a of the cull 5 extends to the side of the mold body 4 and is attached to the lower surface of the lead frame 6.

FIG. 2 is an overall perspective view of an apparatus for separating the cull 5 from the lead frame 6 in one embodiment of the present invention. Reference numeral 11 denotes a transfer means for the lead frame 6, which is configured as follows. 12 is transfer means 1
The cylinder 13 is provided at four corners of the upper surface of the base plate serving as a main body of the apparatus. Chuck claws 14 are connected to both extremes of the cylinder 13. The chuck pawl 14 extends below the base plate 12. When the cylinder 13 is operated, the chuck claws 14 open and close in the lateral direction (Y direction) to chuck both end portions of the lead frame 6 and release the chuck.

In the center of the upper surface of the base plate 12, two cylinders (vertical moving means) 15 are provided. Further, two pressers 16 are provided below the base plate 12. The rod 15a of each cylinder 15 is connected to the presser 16 (see also FIG. 5 (a)). When the cylinder 15 operates and the rod 15a projects downward, the presser 16 descends, and the rod 15a is moved. When pushed upward, the presser 16 rises.
The transfer means 11 is driven by a drive means (not shown) to move horizontally in the X and Y directions and move up and down in the Z direction.

In FIG. 2, reference numeral 20 denotes a main body of the separation device for the cull 5, which is constructed as follows. The base 21 is supported by a support 22. On the upper surface of the base 21, a large number of recesses 23 are formed in which the molded body 4 of the lead frame 6 transferred by the transfer means 11 is fitted. A drop groove 24 for the cull 5 separated from the lead frame 6 is formed on the side of the recess 23. As shown in FIG. 4, the falling groove 24 communicates with a collecting chamber 26 of the cull 5 provided at a lower portion of the base 21.

In FIG. 2, on both sides of the base 21, long grounding members 25 are provided in the X direction. Inside the grounding element 25, a large number of tapered portions 25a extending inward are provided at a pitch. The upper surface of the tapered portion 25a is a downwardly inclined surface as shown in the figure. A groove 27 into which the lower end of the chuck claw 14 is fitted is cut out on the rear surface of the grounding element 25.

In FIG. 2, FIG. 3, and FIG. 4, a vertical standing plate 31 is provided on both sides of the base 21. On the upper part of the standing plate 31, a plurality of strip-shaped strippers 32 extending horizontally toward the upper surface of the base 21 are formed in a comb-like shape.
As shown in FIG. 4, the stripper 32 passes below the grounding bar 25. A support wall 33 is provided upright behind the right standing plate 31, and a motor 34 is mounted behind the support wall 33.

As shown in FIG. 4, a ball screw 35 is installed horizontally below the base 21. The ball screw 35 is driven by a motor 34 to rotate. The standing plate 31
, A nut 36 is attached, and the ball screw 35 is fitted into the nut 36. A right-hand screw 35a and a left-hand screw 35b are formed at both ends of the ball screw 35, and are screwed to the nuts 36, respectively. A slider 37 is mounted below the standing plate 31. The slider 37 is slidably fitted on a Y-direction guide rail 38 provided on the floor surface. Therefore, when the motor 34 is driven and the ball screw 35 is rotated, the standing plate 31 is moved to the guide rail 3.
8 slides in the Y direction, and the peeler 32 moves forward or backward in the Y direction.

In FIG. 2, a pin 4 is
1 is erected. As shown in FIG.
1 is supported by a coil spring 42 at its lower end, and
1 is vertically movable.

This cull separator has the above-mentioned structure, and the operation will be described next. In FIG. 1, the transfer means 11 is moved to a resin molding apparatus (not shown), and the lead frame 6 on which the molded body 4 is formed is chucked and picked up by the chuck claws 14. Transfer upward. 5 (a), 5 (b), 5 (c) and 6 (a), 6 (b) show a series of operations for separating the cull 5 in the order of steps. FIG. 5A shows a state in which the transfer means 11 has transferred the lead frame 6 above the base 21. Next, as shown in FIG. 5B, the chuck claws 14 descend, and the lead frame 6 is grounded on the grounding element 25 and the pins 41. At the same time, the chuck claws 14 retreat outward (see the arrow), and the chuck state of the lead frame 6 is released.

Next, as shown in FIG.
The fifth rod 15a projects downward, and the pressing element 16 descends to hold down the lead frame 6. Then, the left end of the lead frame 6 is pressed against the grounding element 25, and the left end is bent and deformed as shown in the figure. At this time, the coil spring 42 is compressed and the pin 41 descends. By bending and deforming the left end of the lead frame 6 in this manner, the tip b of the bar-shaped resin 5b is partially peeled off from the lower surface of the lead frame 6. Then, the motor 34 is driven to release the stripper 3.
2 is slightly advanced to the right, and the tip c of the rod-shaped resin 5b is pressed by the tip c.

When the tip b of the bar-shaped resin 5b is pressed by the tip c of the stripper 32 in this manner, the pressing element 1
6 is lifted to release the pressed state (see FIG. 6A). Then, in FIG. 6A, the lead frame 6 is elastically deformed by its own spring property so as to be in close contact with the upper surface of the tapered portion 25a. In FIG. 6A, an arrow (a)
(B) shows the direction in which the lead frame 6 is elastically deformed so as to return to its original shape by its own spring property.
When the center portion rises in the direction of the arrow (b), the peeled portion between the lead frame 6 and the rod-shaped resin 5b is enlarged.

Then, by further driving the motor 34, the exfoliator 32 is further advanced to the right as shown in FIG. 6 (b), and the upper surface of the rod-shaped resin 5b is pressed down by the exfoliator 32 to gradually reduce the depth. Deeper. Then, the bar-shaped resin 5b is peeled off from the lower surface of the lead frame 6, and the lead frame 6 is elastically deformed by its own resiliency so as to approach a horizontal posture, and the peeling of the lead frame 6 and the bar-shaped resin 5b further progresses. The lead frame 6 is elastically returned to a completely horizontal posture, the bar-shaped resin 5b is completely peeled off from the lead frame 6, and the recovery chamber 26
(FIG. 4). The pin 41 is a coil spring 42
By pushing up the lead frame 6 by the spring force of the above, the lead frame 6 after peeling becomes a horizontal posture.

By performing the above operation, all the culls 5 attached to the two lead frames 6 shown in FIG.
Are simultaneously separated from the lead frame 6 and collected in the collection chamber 26. Next, the transfer means 11 moves above the resin molding apparatus, and the same operation as described above is repeated. In the above embodiment, the lead frame in which the two molded bodies 4 shown in FIGS. 1 and 7 are formed side by side has been described as an example. However, the present invention is applied to a case in which the molded body shown in FIG. Is also applicable.

[0028]

As described above, according to the cull separating apparatus of the present invention, even if the cull adheres strongly to the lower surface of the lead frame, the cull can be utilized while utilizing the elastic deformation of the lead frame itself due to its spring property. Can be automatically and reliably separated from the lead frame.

[Brief description of the drawings]

FIG. 1 is a bottom view of a lead frame of a cull separating apparatus according to an embodiment of the present invention.

FIG. 2 is an overall perspective view of a cull separating apparatus according to an embodiment of the present invention.

FIG. 3 is a plan view of a cull separator according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view of a cull separator according to an embodiment of the present invention.

FIG. 5A is a sectional view of a main part during cull separation according to an embodiment of the present invention. FIG. 5B is a sectional view of a main part during cull separation according to an embodiment of the present invention. Cross section of main part during cull separation

FIG. 6A is a cross-sectional view of a main part during cull separation in one embodiment of the present invention. FIG. 6B is a cross-sectional view of a main part during cull separation in one embodiment of the present invention.

FIG. 7 is a cross-sectional view of a lead frame showing a conventional method of separating a cull from a lead frame.

FIG. 8 is a cross-sectional view of a lead frame showing a conventional method of separating a cull from a lead frame.

[Explanation of symbols]

 Reference Signs List 4 Mold body 5 Cull 5a Lumped resin 5b Bar-shaped resin 6 Lead frame 11 Transfer means 15 Cylinder (vertical moving means) 16 Presser (pressing means) 21 Base 25 Grounding element 32 Peeler 34 Motor (powering means) 35 Ball screw ( Power means) 36 Nut (Power means)

Claims (1)

(57) [Claims] 1. A transfer means for transferring a lead frame on which a molded body is formed, a base on which the lead frame transferred by the transfer means is mounted, and a side of the lead frame provided on the base. A grounding element whose end is grounded,
A pressing element that presses the lead frame against the grounding element from above to bend and deform, vertical movement means for causing the pressing element to perform an up-down operation, and a peeler that advances between a lower surface of the lead frame and a cull attached to the lower surface. And a power means for causing the peeler to perform a forward and backward operation.