JPH02255233A - Fixed size feeding and cutting device for fine wire - Google Patents

Abstract

PURPOSE:To allow cutting to a fixed size without deforming the sectional shape of fine wires as the cut ends are semicircular by positioning the front ends of the fine wires inserted along the grooves of a guide jig flush with the bottom ends and cutting the wires by a specified length synchronizing the rotation of rolls and the movement of an upper blade. CONSTITUTION:The fine brazing wires 5 are inserted into the respective grooves 11a of the guide jig 11. The wires 5 are mated with the lower blade 13b of the guide jig 13. A press is driven to rotate the roll 9 and the upper blade 15 is driven to synchronize the feed of the wires 5 and the vertical movement of the blade 15, by which the wires 5 can be cut successively intermittently by the prescribed length. Since the rolls 9, 10 are covered with a urethane material, the holding of the wires 5 is sure and since the cutting edge 15a is semiconductor, the drastic deformation of the sectional shape of the fine brazing wires is obviated even is the fine wires are subjected to the shear cutting. The cutting of the wires with the stable shape is possible in this way and the requirement for high dimensional accuracy is met.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a thin wire sizing feeding cutting device for obtaining a fixed amount of material such as a brazing material used for joining IC lead pins to an IC package. Regarding.

[Conventional technology]

As an improvement in the process of soldering IC lead pins to IC packages, there are IC lead pins with brazing material attached to their heads in advance.

As shown in FIG. 5, in order to join the solder metal 2 to the head 1a of the IC lead bin 1, there is a method of punching a certain amount of circular, square, etc. shapes from a solder plate by press working. There is a lot of leftover material compared to the brazing filler metal used, and the cost is also high.

In view of this point, there is a technique disclosed in JP-A-63-115679 as a technique for improving the yield of brazing filler metal.

This technique is shown in the side view in Fig. 6 and in Fig. 6B-B in Fig. 7.
This will be explained using a line cross-sectional view.

According to this method, a plurality of grooves 3a and 4a are formed around each of an upper roll 3 made of urethane and a lower roll 4 made of metal, and a plurality of thin wax wires 5 are intermittently fed, and the grooves 3a,
4a, it can be cut to a fixed size by the upper blade 6 and lower blade 7, which are provided in front of the roll in the feeding direction and close to the roll.

[Problems to be Solved by the Invention] According to the above-mentioned conventional technology, a plurality of thin wax wires are intermittently fed by a certain amount by the grooves of the upper roll and the lower roll, but when cutting, the thin wax wires are fed vertically and horizontally. Shaking occurs, and stability in the vertical and horizontal directions during cutting is extremely poor.
The problem is that it is very difficult to cut into uniform dimensions.

[Means to solve problems]

In the present invention, a pair of rolls whose outer peripheries are covered with urethane material are disposed vertically facing each other, guide jigs are disposed at the front and rear of the pair of rolls, and fine wires are introduced into the surfaces of both guide jigs. A lower blade is provided at the tip of the guide jig in front of the roll, an upper blade is placed opposite to the lower blade, and semicircular grooves are formed on each of the upper and lower blades at the same intervals as the grooves. It is characterized by having a cutting blade formed therein.

[For production]

According to the above configuration, by inserting the thin wire along the valley groove of the guide jig, aligning the tip with the lower blade, and synchronizing the rotation of the roll and the movement of the upper blade, it is possible to always cut a fixed amount. Moreover, since the cutting blade is semicircular, it is possible to cut the wax wire into a regular shape without significantly deforming the cross-sectional shape of the wax wire when shear cutting is performed.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic side view, FIG. 2 is an enlarged sectional view of the guide jig, and FIG. 3 is a sectional view taken along line A-A in FIG.
5 is a thin wax wire, and in this example, 72wt%Ag −
It is made of Cu and has a wire diameter of 0.3 In[Il.

8 is a base, 9.10 is a pair of upper and lower rollers attached to this base 8, and core materials 9a, 10a made of carbon tool steel.
It is a roller whose circumference is covered with urethane material 9b, 10b or made entirely of urethane, and the outer peripheral surface is smooth, and in this embodiment, the outer diameter is 20 m5. 20am wide core material with wall thickness 1
It is covered with 0mm urethane material.

Reference numeral 11 denotes a guide jig detachably attached to the base 8, and is provided in front of the rollers 9 and 10, in which grooves 11a having a depth into which the wax wire 5 is fitted are continuously arranged in parallel. In this example, the radius is 0.17 am, the width is 0.34 mm, the depth is 0.34 mm, and the center pitch is 0.7 mm.

12 is a cover of the guide jig 11.

Reference numeral 13 denotes a guide jig made of cemented carbide that is detachably attached to the base 8, and is provided in front of the rollers 9 and 10, the tip of which is a cutter lower blade 13b, It is similar to the jig 11, and grooves 13a having a depth into which the thin wax wire 5 is fitted are continuously arranged in parallel. This valley groove 13a is located on an extension of the valley groove 11a of the guide jig 11. In this example, the radius is 0.17m.
It has a width of 0.34 m, a depth of 0.34 am, and a center pitch of 0.7 mm.

14 is a cover of the guide jig.

Reference numeral 15 denotes the upper blade of the cutter, which is attached to the shank 16 of the press that moves up and down. As shown in the figure, a semicircular cutting blade 15a
are formed continuously. In this example, it is made of cemented carbide, has a thickness of 3 mm, a width of 20III11 mm, and a length of 25111 mm.
11, the radius of the cutting blade 15a is 0.16 mm, and the center pitch is 0.7 mm, which is the same pitch as the groove 13a of the guide jig 13.

This semicircular cutting blade 15a is the lower blade 13 of the guide jig 13.
The pitch is the same as b and approximates the wire diameter of the wax wire 5,
By forming the wire into a semicircular shape, the thin wax wire can be cut into a stable shape with less displacement such as crushing of the cross-sectional shape when shear cutting is performed.

According to the above configuration, the wax wire 5 is inserted into each of the valley grooves 11a of the guide jig 11, and the wax wire 5 is aligned with the lower blade 13b of the guide jig 13.

By driving a press (not shown) in this state, the roll 9 is rotated, and the upper blade 15 is driven via the free mechanism, and the feeding of the wax wire 5 and the vertical movement of the upper blade 15 are synchronized. It is possible to sequentially and intermittently cut the thin wax wire 5 by a predetermined amount.

At this time, since the rolls 9 and 10 are covered with urethane material, the wax wire 5 can be held securely, and the cutting blade 15
Since a is semicircular, the cross-sectional shape of the thin wax wire will not be significantly deformed even when shear cutting is performed (it can be cut in a stable shape).

〔Effect of the invention〕

According to the present invention described in detail above, a pair of rolls whose outer peripheries are covered with urethane material are arranged vertically facing each other, guide jigs are arranged before and after the pair of rolls, and guide jigs are arranged at the front and rear of the pair of rolls. Multiple grooves are formed on the surface to introduce thin wires, a lower blade is provided at the tip of the guide jig in front of the roll, an upper blade is placed opposite the lower blade, and the upper and lower blades have the same spacing as the grooves. By forming a semicircular cutting blade and synchronizing the rotation of the roll with the drive of the upper blade, a pair of rolls covered with urethane material can be reliably cut by introducing thin wires into the grooves on the surface of the guide jig. It is possible to feed the wire and cut it to a fixed size while accurately positioning and holding it with a guide jig. Moreover, since the cutting blade is semicircular, the cross-sectional shape of the thin wax wire is greatly deformed when shear cutting is performed. It has the effect of being able to cut into a regular shape without cutting, and meeting the demands for high dimensional accuracy.

[Brief explanation of drawings]

Fig. 1 is a schematic side view showing one embodiment of the present invention, Fig. 2 is an enlarged sectional view of the guide jig, Fig. 3 is a sectional view taken along the line A-A in Fig. 1, and Fig. 4 shows the upper and lower blades. An enlarged front view showing the blade, Fig. 5 is a perspective view of an IC lead bin with brazing material attached to the head, Fig. 6 is a side view of the conventional example, and Fig. 7 is a cross-sectional view of Fig. 6 B-B vA. be. 5...Thin wire 9.10...Roller 9bS 10b...Urethane material 11.13...Guide jig 13b...Lower blade 15...Upper blade 15a...Cutting blade transport 1 Rotsumugi 2. Guoguan Guoyan = 3.

Claims (1)

[Claims] 1. A pair of rolls whose outer peripheries at least are covered with urethane material are arranged vertically facing each other, guide jigs are arranged before and after the pair of rolls, and a plurality of wires are introduced into the surfaces of both guide jigs. A groove is formed, a lower blade is provided at the tip of the guide jig in front of the roll, an upper blade is placed opposite to the lower blade, and semicircular cutting blades are provided on each of the upper and lower blades at the same intervals as the grooves. A fixed length feed cutting device for fine wire, characterized by the following: