JPS61173895A - Method of cutting terminal - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a terminal cutting method for cutting off terminals of an element connected to a lead frame from the lead frame.

[Conventional technology]

Devices such as semiconductors are formed in large numbers at once with their terminals connected to a lead frame, so in order to manufacture a product, it is necessary to cut the terminals from the connection to the lead frame and separate the device from the lead frame. There is.

The above-mentioned cutting method includes a cutting method using a blade, and a cutting method in which one of the lead frame and the element is fixed and the other is repeatedly swung in the vertical direction.

[Problem that the invention seeks to solve]

However, in the cutting method using a blade, since the object to be cut is a small item, it is difficult to adjust the position of the cutting point, and there are also disadvantages in that burrs are generated at the cut site and burr removal processing is required.

On the other hand, the cutting method using swinging has the disadvantage that unreasonable stress is applied to the boundary between the element and the terminal, and the boundary is likely to be damaged.

SUMMARY OF THE INVENTION Therefore, the present invention solves the above-mentioned inconveniences, prevents excessive stress from being applied to the boundary between the element and the terminal, and reliably cuts the terminal from a predetermined location without causing any cracks at the cutting location. The technical challenge is to make this possible.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention clamps the terminal' of an element connected to the lead frame via the constricted part with a clamp, and fixes either one of the terminal and the lead frame. , the other is repeatedly swung to cut the terminal from the lead frame.

[Effect]

As mentioned above, if one of the terminals and the lead frame is fixed by clamping the terminal and the other is repeatedly swung, the constriction of the terminal may become fatigued due to the oscillation. It is possible to cut the terminal reliably from the ground, and since large dislocations do not occur as with cutting with a knife, there is no generation of paris, and the terminal can be cut without excessive stress being applied to the boundary between the element and the terminal. I can do it.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in the figure, an element frame holder 2 is fixed to the upper surface of the base 1, and this element bone is provided with an element fitting recess 3 on the upper surface of the holder 2, and the front of the fitting part 3 is connected to a terminal support surface 4. It's Toshide.

A pair of guide shafts 5 are provided on both sides of the base, and a terminal holding plate 6 movably supported along the guide shafts 5 is attached to the terminal support surface 4. It is movable relative to the guide shaft 5 and is pushed upward by a spring 7 fitted to the guide shaft 5.

Further, a clamp base 8 is provided on the upper surface of the base 1 at the rear of the element frame 2, and a clamp mechanism 10 is provided on the top of the clamp base 8 for vertically moving the terminal holding plate 6.
is provided.

Although any clamp mechanism 10 can be used, a toggle mechanism is shown here. That is, as shown in FIGS. 5 and 6, one end of an L-shaped lever 713 is supported via a pin 12 at the front of a single bearing 11 mounted on the upper surface of the clamp base 8. A rod 14 capable of pushing down the center of the upper surface of the terminal holding plate 6 is attached to the other end, and the tip of an operating lever 16 is connected to the center of the L-shaped lever 12 via a pin 15. One end of the link 18 is connected from the center to the tip end via a pin 17, and the other end of the link 18 is connected to the rear part of the bearing 11 with a pin 19.

With the above configuration, when the rear end of the operating lever 16 is pulled up, the lever 13 rotates around the bin 12 and the lower end of the rod 14 moves away from the upper surface of the terminal holding plate 6, so that the spring 7 is resilient. This causes the terminal holding plate 6 to rise along the guide shaft 5 (see FIG. 6). When the rear end of the operating lever 16 is pushed down, the lever 13 rotates in the opposite direction, and the terminal holding plate 6 is pushed down by the rod 14 (see FIG. 5). At this time, the connecting portion between the operating lever 16 and the link 18 comes into contact with the upper surface of the bearing 11 and is prevented from moving downward, and the pin 17 at the connecting portion is moved downward from the straight line connecting the pins 15 and 19. Because of this, the operating lever 16 is held in a depressed state,
The terminal holding plate 6 is held close to or in pressure contact with the terminal support surface 4.

The terminal cutting jig shown in the example has the above structure,
Using this jig, as shown in FIG. 4, in order to cut the terminals 22 of the elements 21 connected in large numbers to the lead frame 20 from the constricted portion 23 of the lead frame 20, - The element rib fits the element 21 into the element fitting recess 3 of the base 2, supports the terminal 22 on the terminal support surface 4, lowers the terminal holding plate 6 by the operation of the clamp mechanism 10, and presses the terminal holding plate 6. The terminal 22 is held between the terminal 22 and the element support surface 4.

In this state, the lead frame 20 is repeatedly swung in the vertical direction, and the terminal 22 is cut from the lead frame 20 due to fatigue of the constricted portion 23.

In the above-mentioned cutting operation, a fitting groove 3 is formed in the tip of the swinging cover 30, as shown by the chain line in FIGS. 2 and 3.
1, and by fitting the lead frame 2σ into the fitting groove 31 and repeatedly swinging the swing bar 30 in the vertical direction, the terminals 22 can be cut very easily and a plurality of terminals 22 can be cut at the same time. be able to.

In the case of the embodiment, the terminal 22 is fixed and the terminal 22 is cut by the swinging of the lead frame 20.
The terminal 22 may be cut by repeatedly swinging the element holder while being held between the base 2 and the terminal holding plate 6.

〔effect〕

As described above, according to the present invention, since the terminals connected to the lead frame are held by clamps, one of the lead frame and the terminal is fixed, and the other is repeatedly swung. The terminal is placed at the connecting part of the lead frame, allowing reliable cutting from the constricted part, and since the terminal is held with a clamp, no undue stress is applied to the boundary between the element and the terminal, and fatigue is avoided. Since cutting is performed using a cutting tool, many advantages can be obtained, such as no large dislocations occurring and no burrs occurring at the cut portion, unlike cutting using a knife.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the terminal cutting jig used in the method of the present invention, FIG. 2 is a partially cutaway side view of the same, and FIG. 3 is a cross-section showing the base portion of the same element holder. FIG. 4 is a plan view of the same, FIG. 5 is a sectional view showing the clamp mechanism of the above, and FIG. 6 is a sectional view of the same in an operating state. 20... Lead frame, 21... Element, 22 River terminal, 23... Constriction portion Patent applicant Sumitomo Electric Industries Co., Ltd. Agent Kama 1) Written by Nisuga--Csu

Claims (1)

[Claims] The terminal of the element connected to the lead frame through the constriction is held with a clamp, one of the terminals and the lead frame is fixed, and the other is repeatedly swung to disconnect the terminal from the constriction. Cutting method.