JPH01138076A - Cold butt welding machine - Google Patents

Abstract

PURPOSE:To use dies with a joint shape and in addition, to easily remove burrs by deviating a groove part of a frame where the dies and V blocks are incorporated in the longitudinal direction of a wire rod. CONSTITUTION:The groove part of the frame 6 where the four dies 1a, 1b, 1c and 1d and the V blocks 5a and 5b are incorporated is manufactured by deviating by (d) in the longitudinal direction of the wire rod. The four respective dies with the entirely joint shape are used and incorporated in the frame 6 along with the V blocks, by which the same effect as offset dies is obtained. Accordingly, only the semicircular burrs of the wire rod welded with pressure which are deviated slightly on right and left of the wire rod are formed and can be easily removed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a welding machine used for cold butt welding.

(Prior art) In the case of butt cold welding of wire rods, welding cannot be performed if there are foreign substances such as holes or dust attached to the butt joint. After removing the foreign matter with a puff or the like, the two were grasped with a die and pressed together to make pressure contact.

However, with the above method, the workability of cutting and puffing the wire is poor, and a so-called "multi-step pressing" method has been developed to improve this. This welding is performed by pressing the wire 3 to 5 times in succession to force out the foreign matter in the butt into the welding hole, and welding is carried out in the part of the wire where there is no foreign matter.This welding will be explained below.

FIG. 3 shows the die part of the cold pressure welding machine, and shows a cross section taken at the hole where the die only grips the gland.

The dice consist of four pieces: lax tbN 1c11d. Reference numerals 2a12b and 2c12d are fingers, which are not shown in the figure, but are moved by a spring with the pin 3 as a fulcrum and arrows (
The rotation is suppressed in the a) direction, preventing the wire rod inserted into the die from retreating and allowing it to move forward.

Spring 4 a s 4 b 14 CX 4 d has 4 dice ta, lb.

1c11d press each other in the direction of separation.

5a15b is a V block, and ① Although block 5a15b is not shown, press it in the direction of the arrow (b) with a lever or the like,
As a result, the die is compressed on seven sides, the wire is gripped by the die, and then the wire is pressed to perform cold welding.

(2) The blocks 5a, 5b and the dies 1a to 1d are assembled into four parts of the frame body 6, and move using the side surfaces 7 of the recessed portions as guides.

The movement of the die during cold welding using a welding machine having such a configuration will be explained with reference to FIGS. 4(A) to 4(P).

(+) Wire 10 to be cold welded as shown in Figure 4 (())
Insert a110b into the die via finger 2a12b12CN2d.

(2) As shown in Figure 4 (b), ■Pro 5. 5a,
By pressing 5b in the direction of the arrow, the die also moves in the direction of the arrow and grips the wire 10a1job with the die.

(3) As shown in Fig. 4 (c), when the ■Pro and Nku are further pressed in the direction of the arrow, the slope 11 of the ■block causes the die to press the butt surfaces of the wire rods together (in the direction of the arrow).
The pressed portion of the wire becomes a burr 127.

(4) As shown in Fig. 4), when the ■ block is returned in the direction of the arrow, the spring 4 az 4 b14 C14d (
(see FIG. 1), the die moves in the direction of the arrow and returns to its original state (see FIG. 4 (a)).

At this time, use fingers to stop the wire so that it does not move back together with the die. This point has already been touched upon somewhat, but 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. This prevents backtracking.

Repeat steps (1) to (4) above 3 to 5 times to complete cold pressure welding by "multi-stage pressure welding."

(Problem to be Solved) When the wire rod welded by cold pressure welding is taken out as shown in Figure 5 (a) as shown in Figure 5 (a). The same figure (b)
(A) The burr 12 generated at the butt in the XX cross-sectional view of the figure
shows. That is, the bar 1J12 that occurred in Fig. 4 (c)
is continuously formed in a substantially circular shape around a cross section perpendicular to the length direction of the wire. The thickness of this burr 12 increases as the diameter of the wire increases, making it extremely difficult to remove.

Therefore, an offset die was devised to facilitate the removal of the burr 12. FIG. 2(A) is an explanatory diagram of the offset die. As shown in the drawings, opposing dies 1a, 11), 11c, and 1d have different dimensions, and are assembled so that their abutting surfaces are slightly shifted in the length direction of the wire rod.

FIG. 2(a) is a side view of the wire rod pressed with such an offset die. The burr 12a112b is formed in a semicircular shape divided into the left and right sides of the wire rod, and the burr 12a112b is removed in a circular manner as shown in FIG. Although it is continuous on the circumference, it is easy to perform.

However, this method requires the manufacture of dies with different dimensions, which not only complicates the manufacture of the dies (but also limits the ability to improve accuracy and reduce manufacturing costs).

(Means for Solving the Problems) The present invention provides a cold butt welding machine that solves the above-mentioned problems. This is because the abutting surfaces of the dies are slightly shifted in the longitudinal direction of the wire.

FIG. 1 is a longitudinal cross-sectional view of the die portion of the cold butt welding machine of the present invention.

In the present invention, 4 dies x fallbt 1c11d
and the groove part of the frame 6 into which the V block 5a15b is installed.
For example, d: The wire is manufactured by shifting the wire by about 0.5 mm in the longitudinal direction. Then, the four dice fa11bs let ld are all congruent, and the V block 5 a
By incorporating it into the frame θ together with 15b, the abutment surface is shifted by d:o, 5mm in the longitudinal direction of the wire,
The same effect as the offset die shown in FIG. 2 can be obtained. Therefore, the burrs on the pressed wire are formed into semicircular shapes that are slightly rubbed on the left and right sides of the wire, as shown in FIG. 2, and can be easily removed.

(Effects of the Invention) As explained above, according to the cold butt welding machine of the present invention, by shifting the groove of the frame in the longitudinal direction of the wire, it is possible to use completely congruent dies to be incorporated therein. Moreover, the paris are easily removed because semicircular shapes are formed with slight rubbing on the left and right sides of the wire, similar to when using an offset die.

Furthermore, since the dies are of a completely congruent shape, manufacturing is easy, and accuracy can be improved and manufacturing costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of the die portion of the cold butt welding machine of the present invention. Figure 2 (a) is a vertical cross-sectional explanatory diagram of the offset die;
B) is an explanatory diagram of Paris using an offset die. FIG. 3 is an explanatory diagram of a die portion of a conventional cold butt welding machine, and FIGS. 4(a) to 4(b) are explanatory diagrams of cold pressure welding. Figure 5 is an explanatory diagram of the welding machine shown in Figure 3.
(A) is a side view, and (B) is a cross-sectional view taken along line XX in FIG. las lbs 1c11d-dice, 5a, 5b ・
V block, 6...frame. Figure 1 Kaya 2 Figure 3 Figure (b) IUD

Claims (1)

[Claims] (1) Assemble the four dies into the frame via the V block, insert the wire rod to be welded into the die hole formed by the above dies, and press the V block to press the die hole and cool the wire between the wire rods. A welding machine that performs cold welding, characterized in that the center of the groove in the frame in which the die and the V-block are incorporated is shifted, and the abutting surfaces of the die are slightly shifted in the longitudinal direction of the wire. Butt welding machine.