JP2549440B2 - Side burr cutter - Google Patents

Description

The present invention relates to a side burr cutter for removing a side burr on a resin-molded lead frame.

(Background Art) FIG. 6 shows lead frames 30 and 32 which are resin-molded to form a mold part 150. This example is 2
One lead frame 30 and 32 are molded with resin at the same time. One cull 74 ... to two gates 75 ...
.. extend to the lead frames 30 and 32, respectively. The resin-molded lead frames 30 and 32 (in the state shown in FIG. 6) are then transferred to the degate processing step. Cull 74 ... and gate 75 in the degate process
... (called scrap) are separated from the lead frames 30 and 32, respectively. The lead frames 30 and 32 that have been individually separated are sent to the next processing stage while being supported by guides 154 and 156 on both side edges as shown in FIG. 7 for sending to the next process. However, the lead frames 30, 32
When molding resin with
.. Ideally, only the gate and the gate 75 are formed, but there is a slight gap between the inner wall of the mold cavity and the side surface of the lead frame where the resin is to be molded. There must be. This is because without this gap, it is impossible to take the lead frame in and out of the cavity. As a result, when the resin molding is performed, side burrs 77 ... Are formed on the side edges 50, 52 of the lead frames 30, 32 near the gates 75. Even if the lead frames 30 and 32 are degated, it is difficult to remove the side burrs 77 ... And they remain on the side edges 50 and 52 of the lead frames 30 and 32. As shown in FIG. 7, when the lead frames 30 and 32 with the side burrs 77 ... Remaining are sent to the feed guides 154 and 156, the entire width X of the lead frames 30 and 32 is sent. Is the distance Y between the feed guides 154 and 156
Compared with, the protrusion amount Z of the side burr 77 becomes longer. For this reason, it becomes impossible to feed the lead frames 30 and 32, the feed guides 154 and 156 are damaged, and conversely, an external force acts on the lead frames 30 and 32 and the lead frames 3 and 32 are applied.
There is a problem that the circuit elements in the mold part 150 are damaged because 0 and 32 are deformed. Therefore, conventionally, after taking out the lead frames 30 and 32 after the degate processing and manually removing the side burrs 77 ..., the lead frames 30 and 32 are sent out onto the feed guides 154 and 156, and the next. Sent to the processing stage.

However, the side burr 77 /
There is a problem in that the work efficiency is poor and the cost increases due to the removal of.

Therefore, an object of the present invention is to provide a side burr cutter capable of automatically and efficiently removing a side burr.

(Means for Solving the Problems) In order to achieve the above object, the present invention has the following configuration.

That is, after resin molding, a mounting portion for mounting the lead frame subjected to the degate processing, a holding portion for holding the lead frame at a predetermined position of the mounting portion, and a side burr of the lead frame are formed. It is characterized in that it is provided with a cutter unit that is movably provided along the side edge and that removes the side burr along with the movement, and a drive unit that moves the cutter unit.

(Operation) The operation will be described.

The drive unit moves the cutter unit along the side edge of the lead frame on which the side burr is formed, and the cutter unit can remove the side burr from the lead frame without manpower with the movement.

(Examples) Hereinafter, preferred examples of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an apparatus for manufacturing a lead frame having a side clipper according to the present invention.

 First, the configuration will be described.

In FIG. 1, reference numeral 10 denotes a hand, which can be vertically moved and horizontally moved by an appropriate mechanism. The hand 10 has a claw part that can be opened and closed to grip and release the lead frame.
Two sets of 12a and 12b and claw portions 14a and 14b are provided. The hand 10 is horizontally movable at least above a die (not shown) for resin-molding a lead frame and above a degate stage 16 for performing a degate process and removing side burrs. The hand 10 is provided with frame pressing rollers 18 and 20 which are an example of a holding unit. Frame holding rollers 18 and 20 are air cylinders fixed to the hand 10.
By driving 22 (one is not shown), the hand 10 can be moved up and down.

24 and 26 are pallets that are an example of a mounting unit, and a main body 28
As shown in FIG. 4 (plan view), recesses 34 and 36 for positioning the lead frames 30 and 32 at predetermined positions are formed on the upper surface, as shown in FIG. 4 (plan view). palette
24 and 26 are attached to a main body 28 so as to be rotatable about shafts 38 and 40 in the directions of arrows A and B, and are normally held in a horizontal state shown in FIG. 1 by a stopper (not shown). . Rollers 42 and 44 are provided on the lower surface of the pallets 24 and 26 in the vicinity of the left end in FIG. 4, and the innermost points on the outer circumferences of the rollers 42 and 44 are slightly smaller than the opposite side surfaces 46 and 48 of the pallets 24 and 26. It is located inside. It should be noted that when the lead frames 30, 32 are positioned at predetermined positions in the recesses 34, 36, the side edges 50, 52 of the lead frames 30, 32 become side surfaces 46, 48 of the pallets 24, 26.
It is located on the inner side and slightly outside the innermost point on the outer circumference of the rollers 42, 44.

In FIG. 1, reference numeral 54 denotes an air cylinder, and a rod 56
The upper end of is fixed to a frame-shaped member 58 whose center is hollowed out, and the frame-shaped member 58 moves up and down as the rod 56 of the air cylinder 54 expands and contracts. An extension member 60 is provided on the left end of the frame-shaped member 58, and a guide 62 is provided on the lower surface of the extension member 60 in the length direction of the extension member 60 (see FIG. 4 for the planar shape). . A fitting member 66 having a groove 64 on the upper surface is fitted to the lower portion of the guide 62, and the fitting member 66 is arranged so as to be movable in the length direction of the guide 62. Further, the fitting member 66 is fitted to the guide 62 via a bearing (not shown), and is prevented from coming off the guide 62. A support member 68 to which a cutter unit described later is fixed extends from the lower part of the fitting member 66 to the right. FIG. 5 shows the relationship among the frame member 58, the extension member 60, the guide 62, the fitting member 66, and the support member 68. Frame member 58, extension member 60, guide 62, fitting member 66, and support member
68 are mutually assembled so that they can be moved up and down as the rod 56 of the air cylinder 54 expands and contracts.

As shown in FIGS. 1, 4, and 5, a long cull receiving portion 70 is elastically mounted on the upper surface of the frame member 58 via a spring 72. The cull receiving portion 70 is provided to push up the cull 74 from below during the degate process of the lead frames 30 and 32. Further, the frame member 58 is provided with twists 76 and 78 (not shown in FIGS. 4 and 5), and an air cylinder 80 fixed to the frame member 58 (one is not shown). It can move up and down. In other words, twist 76, 78
Is further moved up by the air cylinder 80 when it is moved up along with the frame-shaped member 58, and as shown in FIG.
It is provided to remove scraps such as cull 74 from the lead frames 30 and 32 by pushing up 4, 26 and rotating the shafts 38 and 40 in the directions of arrows A and B around the shafts 38 and 40.

In FIGS. 1, 4, and 5, reference numeral 82 is an air cylinder that is an example of a drive unit, and is fixed to the main body 28 via a mounting tool (not shown). The tip of the rod 84 of the air cylinder 82 is fixed to the fitting member 66. Therefore, the rod 84
The fitting member 66 and the supporting member 68 can move in the length direction of the guide 62 (arrow C) with the expansion and contraction of.

In FIGS. 1 and 4, 86 is a cutter portion, which is provided on the upper surface of the support member 68. Details of the cutter unit 86 are shown in FIG. Reference numerals 88 and 90 are cutter pieces, and blades 92 and 94 for removing side burrs are fixed to the outside of the upper end. The cutter pieces 88, 90 are rotatable in the directions of arrows D, E with respect to a frame 98 fixed to the support member 68 via shafts 94, 96. However, there is a spring 100 between the cutter pieces 88 and 90.
The cutter pieces 88 and 90 are always urged in the directions (arrow F) away from each other. The cutter pieces 88 and 90 are urged so as to be separated from each other, but the cutter pieces 8 and 90 are screwed to the frame 98 by the adjusting screws 102 and 104.
The maximum distance between the tips of 8 and 90 is adjustable.

The operation of the main part of the lead frame manufacturing apparatus configured as described above will be described.

The lead frames 30 and 32 are molded in the state shown in FIG. 6 in a resin mold die (not shown). Cull that remains connected to these lead frames 30 and 32 ...
.. To remove the gate 75 ..., the claw portion 12 of the hand 10
The lead frames 30 and 32 are gripped by the a and 12b and the claws 14a and 14b and moved to the upper side of the degate stage 16 shown in FIG. 1, and the hand 10 descends to lead the claws 12a, 12b, 14a and 14b. Release frames 30, 32 and pallet lead frames 30, 32
24, 26 are placed in the recesses 34, 36 on the upper surface. At that time Cal 74
.. is loosely fitted in the cull guide 108 provided on the lower surface of the central block 106 of the hand 10. On the other hand, at the same time when the hand 10 places the lead frames 30, 32 on the pallets 24, 26, the air cylinder 54 is driven and the rod 56 extends. As a result, the frame members 58 and the like also rise,
70 supports the cull 74 ...
Holds Cal 74 ... with 108. The position of the culls 74 ... Is fixed by this holding. Cal 74 ...
When the position is fixed, the air cylinder 80 is driven, and the twists 76 and 78 further rise from the frame-shaped member 58 and the pallet
Push the lower surfaces of 24 and 26 upward. As a result, palette 2
4 and 26 rotate in the directions of arrows A and B. At that time, Cal 74.
Since the position of ··· is fixed, the gates 75 are broken from the lead frames 30 and 32, separated, and subjected to degate processing. Thereafter, the hand 10 rises, and at the same time, the twists 76 and 78 move downward with respect to the frame member 58 by the air cylinder 80, and the frame member 58 and the like also descend due to the air cylinder 54 shortening the rod 56. . However, the scrap that has been cut off is still placed on the cull receiving portion 70. Therefore, the rod 56 of the air cylinder 54 is moved up and down again to shake down the scrap. At that time, twist 76,
78 has already returned to the lowest position, and does not interfere with the pallets 24 and 26. The state of the lead frames 30 and 32 after the scrap is removed is as shown in FIG.
..Side burrs 77 ... remain on the side edge where the. The rod 56 of the air cylinder 54 is once again extended to remove the side burr 77 ...
The extension member 60, the guide 62, the fitting member 66, the support member 68, and the cutter portion 86 move upward together. And the cutter section 86
The cutter pieces 88, 90 of the cutter project upward from the central space 59 of the frame member 58. At that time, the height positions of the blades 92, 94 are adapted to match the height positions of the side edges 50, 52 of the lead frames 30, 32. At that time, the air cylinder 22 of the hand 10 is driven, the frame pressing rollers 18, 20 are moved downward, and the lead frames 30, 32 are pressed against the pallets 24, 26 to lead frame.
Fix 30 and 32. After fixing lead frames 30 and 32, air cylinder to remove side burr 77 ...
When the rod 84 is driven and the rod 84 is extended, the fitting member 66, the supporting member 68, and the cutter portion 86 are integrally guided by the guide 62 in the direction of the arrow C to perform horizontal movement. Then, the cutter pieces 88, 90 first come into contact with the rollers 42, 44, but the spring 100 is compressed and the cutter pieces 88, 90 rotate inward relative to each other to pass between the rollers 42, 44. Since the gap between the rollers 42 and 44 is narrower than the gap between the opposing side edges 50 and 52 of the lead frames 30 and 32, the cutter piece that has passed between the rollers 42 and 44
88 and 90 enter between the lead frames 30 and 32. Then, the blades 92, 94 of the cutter pieces 88, 90 are pressed against the side edges 50, 52 of the lead frames 30, 32 by the urging force of the spring 100. As the cutter 86 moves in the direction of arrow C, side burr is generated.
77 ... is cut with the blades 92, 94 and removed from the lead frames 30, 32. After removing the side burr 77 ...
The air cylinder 54 compresses the rod 56, after which the air cylinder 82 shortens the rod 84 and returns the cutter 86 to the previous position. An air cylinder 22 provided on the hand 10 also moves the frame pressing rollers 18 and 20 upward. Then, the lead frames 30, 32 from which the side burrs 77 ... Are removed are conveyed to the next step.

Although the degate process and the side burr removal are performed by the above operation, after the degate process is completed, the side burr can be removed on the same stage without moving the lead frame, and the lead frame is moved to remove the side burr. There is an advantage that it is possible to save time and labor, and it is not necessary to provide a stage for removing the side burr.

Although various preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and, for example, the side burr cutter is not incorporated in the lead frame manufacturing apparatus, but an independent apparatus. Of course, more modifications can be made without departing from the spirit of the invention.

(Effects of the Invention) When the side burr cutter according to the present invention is used, it is possible to automatically remove the side burr of the lead frame, which was conventionally manually removed by an operator, so that work efficiency is improved. In addition to the effect, it is possible to remove uniform side burrs.

[Brief description of drawings]

FIG. 1 is a principal part drawing of a lead frame manufacturing apparatus of an embodiment provided with a side burr cutter according to the present invention, FIG. 2 is a view showing a structure of a pallet as a placing part, and FIG. 3 is a cutter part. FIG. 4 is a sectional view, FIG. 4 is a plan view of a degate stage, FIG. 5 is an explanatory view showing a connecting structure of frame members and the like, and FIG. 6 is a partial plan view showing a resin-molded lead frame before scrap removal. , FIG. 7 is an explanatory view showing a lead frame with side burrs remaining. 18,20 …… Frame press roller, 24,26 …… Pallet, 3
0,32 …… Lead frame, 50,52 …… Side edge, 77 …… Side burr, 82 …… Air cylinder, 86 …… Cutter part.

Claims (1)

(57) [Claims] 1. A mounting portion for mounting a lead frame that has been demolded after resin molding, a holding portion for holding the lead frame at a predetermined position of the mounting portion, and a side burr of the lead frame. A side burr cutter, which is provided so as to be movable along a formed side edge, and which includes a cutter part for removing the side burr according to the movement, and a drive part for moving the cutter part. .