JPH0512076B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for inserting a wire into a die in a wire butt cold welding machine.

(Prior art) In the case of butt cold welding of wire rods, pressure welding cannot be performed if foreign matter such as oil or dust adheres to the butt surfaces of the wire rods, so initially the butt surfaces are cut with a knife or the butt surfaces are After removing foreign matter with a buff etc.
They were gripped with a die and pressed together to make pressure contact.

However, the above-mentioned method has poor workability such as cutting and buffing the wire, and an improved method called "multi-stage pressing" was developed. In this method, by pressing the wire 3 to 5 times in succession, foreign matter on the abutting surfaces is pushed out into the press burr, and the wire is press-bonded in a place where there is no burr inside the wire.

FIG. 1 shows a die portion of a conventional multi-stage cold press welding machine, and only the die shows a cross section taken at a hole for gripping a wire.

The dice consist of four pieces, 1a, 1b, 1c, and 1d. 2a, 2b, 2c, and 2d are fingers, which are not shown, but are rotated and pressed by a spring in the direction of arrow A with the pin 3 as a fulcrum, and prevent the wire rod inserted into the die from retreating and allow it to move forward. It is something.

Spring 4a, 4b, 4c, 4d are four dice 1
a, 1b, 1c, and 1d are pressed in the direction that they are separated from each other.

5a and 5b are V blocks, which are pressed in the direction of the arrow R with a lever as described later, thereby pressing the die with the V surface and gripping the wire with the die, and then pressing the wire in the axial direction to cool it. It performs pressure welding. The V-blocks 5a, 5b and the dies 1a, 1b, 1c, 1d are incorporated in a recessed portion of the main body 6, and move using the side surface 7 of the recessed portion as a guide.

The movement of the die during cold welding using the cold welding machine having such a configuration will be explained with reference to FIGS. 1A to 1D.

Wire rod 10 to be cold welded as shown in Fig. 1A
a, 10b as fingers 2a, 2b and 2c,
Insert into the die via 2d.

As shown in FIG. 1B, by pressing the V blocks 5a, 5b in the direction of the arrow with a lever described later, the dice also move in the direction of the arrow, and the wire rods 10a, 10b are gripped by the dice.

As shown in FIG. 1C, V blocks 5a, 5b
If you press further in the direction of the arrow, the die will turn V
Along the slope 11 of the block, the wire rods 10a, 1
The abutting surfaces of 0b are moved in the direction of pressing each other (in the direction of the arrow), and the pressed part of the wire becomes a burr 1.
It becomes 2.

As shown in FIG. 1D, V blocks 5a, 5b
When returned to the direction of the arrow, springs 4a, 4b, 4
c and 4d (see FIG. 1), the die moves in the direction of the arrow and returns to the state shown in FIG. 1A.

At this time, the wires 10a, 10b are stopped by fingers 2a, 2b and 2c, 2d so that they do not retreat together with the die. At this time, due to the friction between the tip of the finger and the wire, the finger tries to rotate in the biting direction using the pin 3 as a fulcrum, thereby preventing the wire from retreating.

Repeat the above steps 3 to 5 times to complete cold pressure welding by "multi-stage pressure welding."

(Problem to be solved) As mentioned above, in multi-stage pressure welding of wire rods, the first
As shown in Figure A, when inserting the wire rod to be cold welded into the die through the fingers, conventionally a gap (Figure 2 and Figure 3 G) is provided to prevent the wire rod from falling out of the die. Because the wire has no stiffness like thread, it bends under its own weight or a slight external force.
When inserting the wire into the dies, it is easier to work if the distance between the dies is wide enough to pass the thread through the hole of a needle. As shown in FIG. 3, when inserting the wire c into the groove 16 of the die 11, since the wire c is meandering, even if the die interval g is wider than the wire c,
It is caught in the die hole 16 at point and b and will not fall. However, when the wire c is gripped by the die 11 for pressure welding, the meandering part of the wire c may be straightened and the wire may fall from the die groove 16, which causes a problem in that poor pressure welding occurs. Ta.

(Means for Solving the Problem) The present invention provides a method for inserting a wire into a cold pressure welding machine that solves the above-mentioned problems, and has the following characteristics:
After inserting the wire into the die groove having a gap, the above-mentioned gap is closed by operating an adjustment knob attached to the tip of a V-block in which the die is installed, and then the wire is pressed.

FIG. 2 is an explanatory diagram showing a cross section of a cold pressure welding machine used in the present invention.

In the drawing, 11 is a die incorporated into the V-block 13, and 12 is an adjustment knob provided with a threaded rod 14, the tip 15 of which is in contact with the protrusion 15 of the V-block 13. Therefore, when inserting the wire c (see Fig. 3) into the die 11, the wire c
Considering the meandering of the grooves 16 of the die 11, the interval g
Make it wide enough that the wire c does not fall down,
When the wire c is inserted into the die groove 16, by turning and operating the adjustment knob 12, the V block 13 moves forward to close the gap g. In this state, when the handle is operated to repeat the press-welding process as in the conventional case, a good press-weld connection can be obtained without the wire c falling out of the die groove 16.

(Effects of the Invention) As explained above, according to the method of the present invention,
When inserting the wire into the die groove, the distance between the die grooves is wide, making it easy to insert the wire. Furthermore, since the adjustment knob is operated and closed before the pressure welding process, the wire does not fall out of the die groove during the pressure welding process, and a good pressure weld connection can be achieved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a die portion of a cold pressure welding machine, and FIGS. 1A to 1B are explanatory diagrams of the operation of the die portion. FIG. 2 is an explanatory diagram showing a cross section of a cold pressure welding machine used in the method of the present invention. FIG. 3 is an explanatory diagram of the relationship between the die interval and the inserted wire. 11...Dice, 12...Adjustment knob, 13...
...V block, 14...Adjustment knob screw rod, 1
5...Tip of threaded rod, 16...Dice groove, g...
...dice spacing.

Claims (1)

[Claims] 1. A wire rod characterized in that after a wire rod is inserted into a die groove having a gap, the adjustment knob attached to the tip of the V block incorporating the die is operated to close the gap, and then the wire rod is pressed. How to insert wire into a butt cold welding machine.