JPH01157782A - Cold butt welding machine for wire rods - Google Patents

Abstract

PURPOSE:To prevent meandering of wire rods by moving dies holding the wire rods at two steps in the direction to cross orthogonally to the direction of the wire rods and then in the direction of the wire rods after finishing welding. CONSTITUTION:When the wire rods are inserted to grip a handle, since a projection 11 is separated, a lever 9 presses a frame 8 by a spring 10 and the frame 8 presses lower side dies 2b and 2d and the movements of the lower side dies and upper side dies in the direction of the wire rods are controlled. Further, when the handle is gripped, the upper side dies are stuck to one another to hold the wire rods. Further, when the handle is gripped, the four upper side dies 1a-1d are entirely stuck to one another by a V block 6a. At this time, since the upper side dies are connected to the lower side dies by a keyway, the inserted wire rods are pressed in the axial direction. The handle is released up to the middle and the upper side dies first retreat in the direction to cross orthogonally to the wire rods by springs 3a and 3b in the upper side dies. At this time, the upper side dies move only in the direction to cross orthogonally to the wire rods and do not move in the direction of the wire rods. Further, when the handle is released, since the frame 8 is released, the control of the movements of the lower side dies in the direction of the wire rods is released.

Description

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

(Prior art) In the case of butt cold welding of wire rods, welding cannot be performed if there is foreign matter such as oil or dirt on the butt surfaces. After removing foreign matter from the surface 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 3 to 5 times in succession to push out foreign matter on the abutting surfaces into the welding gap, and welding is carried out in areas where there are no foreign matter inside the wire. This welding will be explained below.

FIG. 7 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: 21^, 2L6121C121d. 226L, 226 and 22C, 22d
is a finger, which is not shown in the figure, and is attached to pin 2 by a spring.
It is rotated and pressed in the direction of arrow (A) using 3 as a fulcrum,
This prevents the wire rod inserted into the die from retreating and prevents it from moving forward.

Spring 244.24, 24C, 24d are 4 dice 2
14. 21 people and 21C121d press in the direction away from each other.

25^, 256 are V blocks, ■block 254.2
Five people (not shown) press in the direction of the arrow (B) with a lever, etc., thereby compressing the die on 7 sides, gripping the wire with the die, and then pressing the wire to perform cold welding. It is something. ■Block 25a, 2 6 and dice 21^~
21d is incorporated in the recess of the main body 2B, and moves using the side surface 27 of the recess as a guide.

Figure 8 is a cross section taken along line A-A in Figure 7, with 28 inserting the wire;
29 is a hole for gripping, and is a blank space where burrs are exposed during welding.

FIG. 9 is a cross section taken along line BB in FIG. 7. The dimension C in FIG. 9 is such that the distance between the dies 214 and 216 and between the dies 21C and 214 is such that the wire 30 does not fall from the die hole 28.

The movement of the die in cold pressure welding using a welding machine having such a configuration will be explained with reference to FIGS.

(1) Wire rod 30 to be cold welded as shown in Figure 7 (a)
4.30 people with finger 224.22 go, 22C122
Insert into the die via d.

(2) As shown in FIG. 7(b), ■ block 254,
By pressing 256 in the direction of the arrow, the die also moves in the direction of the arrow, and the die holds the wire 30tL and 306.

(3) As shown in FIG. 7(c), when the ■ block is further pressed in the direction of the arrow, the slope 31 of the ■ block causes
The die moves in a direction (in the direction of the arrow) to press the abutting surfaces of the wire rods together, and the pressed portion of the wire rod becomes a burr 32.

(4) As shown in Fig. 7), when the ■ block is returned in the direction of the arrow, springs 24^, 24 people, 24C, 24d (
(see FIG. 7), the die moves in the direction of the arrow and returns to its original state (see FIG. 7(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) According to the f8 welding machine described above, there is no problem until the wires are pressed together.

However, there is a problem with the movement of the die from 411s when the wire rod is pressed <FIG. 7(c)) until the die returns to its original state.

However, if the wire is relatively thick and has a stiffness (a state in which it does not bend with a little force), there is no problem.

This is because, as shown in Fig. m7), when the die returns to its original position, the movement of the arrows (a) and (b) is simultaneous, so the die hole 28 and the outer periphery of the wire come into contact. Therefore, when the line is thin and has no stiffness (like a thread), the movement of the die in the direction of the arrow (B);
The wire snakes inside the die or between the die and the fingers, and there is no point in using the fingers to prevent the wire from retreating.

As already mentioned, the abutting surfaces of the wire rods cannot normally be pressed together during the first pressing due to oil, dirt, oxide film, etc. Therefore, when the die returns and the wire also retreats, the abutting surfaces of the wire become separated, and there is insufficient compression allowance for cold welding, making it impossible to perform welding even if repeated operations are performed. Note that the compression cost is 0.
．． 75D to ID (D is the wire diameter).

(Disclosure of the invention) The welding machine explained above has the following characteristics in Fig. 7 (a), (b), and Q9.
It is clear that moving the die in the directions of arrows (a) and (b) at the same time, as shown in Figure 7, is not suitable for fine wire butt welding. Therefore, in the present invention, as shown in FIG. 7 (E),
First, release the wire from the die hole, then
As shown in FIG. 7(f), the present invention aims to provide a cold butt welding machine for thin wires that can prevent meandering of the wire as much as possible by moving the die in the axial direction of the wire.

FIG. 1 is a partially cutaway longitudinal sectional view of a specific example of the welding machine of the present invention. Figure 2 is a perspective view of the die part of the welding machine in Figure 1;
Figure 3 is a vertical cross-sectional view of the die part, Figure 4 (a) is a cross-sectional view of X+-X+ in Figure 3, and figure (b) is an
3-X3 sectional view, and FIG. 5 is an X2-X2 sectional view of FIG.

As shown in FIG. 3, in the present invention, the upper die (
The lower die (2^) (26) closely overlaps under ItL) (+6), forming a two-tiered structure. In FIG. 4, Cl4)Cl6)(IC)(ld) indicates the four upper dice, and (26L)(26)(2C)(2) in FIG.
d) shows the lower dice corresponding to the four upper dice. As shown in FIG. 4(B), a key-shaped protrusion (48) (td) is provided on the upper surface of the lower die in a direction perpendicular to the wire, while the protrusion (48) (td) is provided on the bottom surface of the upper die. 41 (4d) is provided with a key-shaped groove into which the upper die (14) (+6) (IC) (I d
) and lower dice (26L) (2 people) (2C) (2d)
are configured to be able to slide in a direction perpendicular to the wire while being in close contact with each other through keyway coupling.

The opposing dice (IL!:L) and (+
A spring (36L) (3 people) is inserted between (1!1) and (IC) and (Id), respectively, and the fixed side die (
1tL) (IC), the movable die (Illd) can be pressed and moved only in the direction orthogonal to the wire.

On the other hand, the adjacent dice (26L) and (2C) on the lower side
And between (26) and (2d) are springs (5tL).
) (5t!1) is inserted, which causes the die (
26L) pair (2C) and (26) pair (2d) can be independently moved relative to each other only in the wire direction.

(6^) is a moving V block incorporating a moving die (+6L) (Ic), (66) is a fixed die I+t
! t ) (Id) is a fixed-side V block incorporating it.

(7) and (8) are plates, the plate (7) is fixed to the main body, and the plate (8) is connected to the lower die (26) (
2d) and brake the lower die (2^) (2 people) (2C) C2d l. (9) is a lever that presses and releases the plate (8), and is actuated by a spring (10). The protrusion (11) provided on the handle
) is away from the lever (9), the frame (8) is pressing the lower III die (26) (2dl).

(Function) The operation when connecting wires using the welding machine of the present invention will be described below with reference to FIGS.

FIG. 6(A) shows a state in which the wire has been inserted and preparation for connection is completed (the handle is not gripped). In this state,
A force acts on each part in the direction of the arrow. In the figure, the frame (8) is released and a gap (δ) is created between the frame (8) and the lower die (2mo) (2d).

Therefore, the lower die (26L) (212C) (2d)
The movement of the wire in the direction of the wire is not damped. Upper die (1
α) (1 go) (IC) (Id) and lower die (2a) (
26) (2C) (2d) are keyway connected, so the movement of the upper die (l^) (161 (Ic) (ld) is not braked either.

Figure 6 (center) shows the driver holding the handle. When you squeeze the handle, the protrusion (I) provided on the handle separates, so the lever (9) is moved by the spring (10) to the frame (8).
), frame (8) is lower die (2j!1)
Press (2d). Therefore, the lower die (2α) (
26) (2C) C2d ) and upper die (Iα) (II
! The movement of IHIc)(ld) in the wire direction is braked.

Furthermore, when you squeeze the handle, the upper die (I^) and (1no)
and (IC) and (1d) grip a dense wire rod.

FIG. 6(c) shows a state in which the handle is further gripped.

When the handle is further squeezed, the moving die (+1ld) is moved by the block (64) to the fixed die (ItL) (I
Move to C) side and place 4 upper dice (l^) (+l+c
) (Id) is in complete contact.

At this time, the lower die (2^) (2 go) (2C) (2d
) is braked in the wire direction, but the ■ block (
Since the pressing force of 6^) (86) is greater, the V block (6^) moves in the direction of the wire along the V groove of (16) in the braking state. At this time, since the upper die and the lower die are connected by a keyway, the upper die also moves in the direction of the wire rod and presses the inserted wire rod in the axial direction.

Figure 6) shows a state in which the handle is released at intermediate speed. First, the upper die (+6L) (IC) retreats in the direction perpendicular to the wire due to the spring (313j!J) in the upper die. At this time, since the lower die is braked, the upper die moves only in the direction perpendicular to the wire and does not move in the direction of the wire.

Furthermore, when the handle is released, the protrusion (II) provided on the handle contacts and presses the lever (9), releasing the frame (8), so the lower die (2^) (2
12C) The braking of the movement in the wire direction (2d) is released. Therefore, the lower die (2^) (26) (2C) (2d
) are the springs (54) (56) built into the lower die.
) to move in the wire direction, the upper die (14) (
+6) (IC) (ld) also moves in the direction of the wire, and as shown in Figure 6 (
b) Restore to the prone state. The entire process is now complete.

By repeating the steps shown in FIG. 6(a) to 6(a) to 6(a) above ten times, a complete pressure-welding state is obtained.

(Effects of the Invention) As explained above, according to the welding machine of the present invention, after welding is completed, by moving the die gripping the wire in two steps, in the direction perpendicular to the wire direction and then in the direction of the wire, This has the effect of preventing meandering of loose thin wires.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway vertical view of a specific example of the welding machine of the present invention, Fig. 2 is a perspective view of the die portion of the welding machine of Fig. 1, and Fig. 3 is the same (
FIG. 3 is a vertical cross-sectional view of the die portion. Figure 4 (a) is a sectional view of Xl-X+ in Figure 3, and the same figure (b)
(A) is a cross-sectional view of X3-X3 in Figure 5, and Figure 5 is a cross-sectional view of
It is a 2-X2 sectional view. FIGS. 6(a) to 6) are explanatory views of the operation when connecting wires using the welding machine of the present invention. FIG. 7 is an explanatory diagram of a die portion of a conventional cold butt welding machine. FIGS. 7A to 7F are explanatory views of the operation of the die portion of the welding machine. Figure 8 is a sectional view taken along line A-A in Figure 7, and Figure 9 is a cross-sectional view taken along line B-- in Figure 7.
It is a sectional view of B. +4.1 person, IC, Ld...upper die, 2tL12
6.2C, 2d...lower die, 3tL, 39...
Upper die built-in spring, 4^, 46.4C14d...Key-shaped projection, 56L, 54...Lower die built-in spring, e
tL1e6...■block, 7.8...frame,
9... Lever, 10... Spring, ■... Handle protrusion. FIG. Bu 1 Zukan 2 Zuzu 3 Zui 4 Diagram (A) (B) ^3 '35 Prisoner Sen 6 N (A) δ (υ) Mizu 6 Diagram (C) (=) Rishi 7 Gago ("mouth"'nj;n: 7 [(]rioi 7 figure (e)

Claims (1)

[Claims] (1) The dies have a two-stage structure of an upper die and a lower die, and the upper die and the lower die are movable in a direction perpendicular to the wire rod through a keyway connection, and the upper die is located between opposing dies. A spring is inserted in the direction perpendicular to the wire rod, so that the movable die can press against the fixed die only in the direction orthogonal to the wire rod, and the lower die has a spring inserted between adjacent dies. After butt welding, the die is moved back in the direction perpendicular to the wire to release the wire from the die hole, and then the die is moved in the direction of the wire. A cold butt welding machine for thin wire, characterized in that it is configured to prevent meandering of the wire.