JPH01143734A - Method and jig for straightening wire rod - Google Patents

Abstract

PURPOSE:To fully straighten a wire rod high in hardness, tensile strength to give enough linearity by passing the wire rod through a bent teflon tube and revolving the teflon tube in the direction normal to the advancing direction of the wire rod. CONSTITUTION:A brush wire rod 7 is inserted into a teflon tube 5 projecting from a tubular supporting axis 2 on the front end surface of a jig body 1. The wire rod is passed through the internal part of the bent teflon tube 5 and the front end is lead out of the teflon tube 5 projecting from the tubular supporting axis 3. Then, the tubular supporting axes 2, 3 are gripped by collector chucks 8, and the front end of the wire rod is drawn to be taken up round a reel as a straightening jig 6 is rotated. Accordingly, bend of the wire rod 7 is ironed by bent parts of the teflon tube 5 to be dissolved and twist of the wire rod is dissolved by the revolution of the teflon tube 5 to obtain a brush wire rod 7 having sufficient linearity.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for straightening a wire rod used for a sliding brush, a sensor, etc., and a jig therefor.

(Conventional technology and its problems) Wire rods used for sliding brushes, sensors, etc. are required to have good linearity and mechanical properties (hardness, springiness, tensile strength, etc.), and are also free from dirt, discoloration, and foreign matter in appearance. It is required that there is no adhesion.

Conventionally, in order to straighten the wire, tension is applied to the wire and the wire is passed through an electric furnace and heated to finish the wire.

By the way, in the above method, if foreign matter is attached to the wire, it may change color due to heating or become burned and cannot be removed. Therefore, it is necessary to spend sufficient time cleaning in advance, and strict control is required to prevent secondary contamination during cleaning.

In addition, in the above method, since the wire is softened by heating, a wire rod having sufficient mechanical properties such as hardness and tensile strength cannot be obtained.

Furthermore, in the above method, it was difficult to balance the heating temperature and speed, so a wire rod with sufficient linearity could not be obtained.

(Object of the Invention) The present invention has been made to solve the above-mentioned problems, and provides a method for straightening a wire rod with sufficient straightness and mechanical properties by mechanical straightening without using heating. The purpose is to provide a jig.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the method for straightening a wire rod according to the present invention involves passing the wire rod through a bent Teflon tube, and using the Teflon tube as a method for advancing the wire rod. It is characterized by rotating in a right angle direction to straighten the wire.

In addition, the jig for carrying out the above-mentioned method for straightening wire rods is equipped with tubular support shafts at both the front and rear ends, and a large number of pins are installed horizontally in the front-rear and up-down directions inside. The introduced Teflon tube is led out from a tubular support shaft at the upper rear end which is appropriately bent in the vertical direction between a number of pins.

(Function) As described above, in the method for straightening a wire rod according to the present invention, the wire rod is passed through a bent Teflon tube and the Teflon tube is rotated in a direction perpendicular to the direction of movement of the wire rod. The twisting of the wire is eliminated by squeezing it at the bent part of the tube, and the twisting of the wire is eliminated by rotating the Teflon tube, resulting in a wire with sufficient straightness. Moreover, since the wire is not damaged even though it is mechanically corrected, no scrap is generated.

Further, according to the wire rod straightening jig according to the present invention, the above-mentioned wire rod straightening method can be carried out smoothly, easily and reliably, and the workability is good.

(Example) An example of a wire straightening method and a jig thereof according to the present invention will be described.

First, a straightening jig for a wire rod will be explained with reference to Fig. 1.2. Reference numeral 1 is a hollow jig body with a flat octagonal side and a rectangular plane. A tubular support shaft 2.3 is provided. Inside the jig main body 1, a large number of pins 4 are removably attached laterally at regular intervals in the front-rear and up-down directions. Then, from the tubular support shaft 2 on the front end surface to the inside of the jig main body 1, the inner diameter is 0.5 mm.
A Teflon tube 5 is introduced, is suitably bent vertically and passed between a large number of pins 4, and is led out from the tubular support shaft 3 on the rear end surface. In addition, 1a is the jig main body 1
It is a window on the side.

Next, a method for straightening a wire using the straightening jig 6 configured as described above will be explained. As shown in FIG.
35wt%-Ag30wt%-Cu 14wt%-Zn
A brush wire 7 with a wire diameter of 0.09 mm made of 1wt% is introduced into the Teflon tube 5 protruding from the tubular support shaft 2 on the front end surface of the jig main body l, and passed through the bent Teflon tube 5 to remove the tip. is led out from the Teflon tube 5 protruding from the tubular support shaft 3. In this state, the tubular support shafts 2.3 at both front and rear ends are gripped by the collect chucks 8, and the straightening jig 6 is rotated at 120 rpm using a rotating device (not shown).
While rotating at +, the tip of the brush wire 7 is pulled and wound onto a reel (not shown), and the bend in the brush wire 7 is squeezed by the bent portion of the Teflon tube 5 and eliminated. Also, the twist of the brush wire 7 is the Teflon tube 5.
The problem was resolved by rotation of , and a brush wire 7 with sufficient straightness of 2/100 was obtained. The brush wire 7 had a hardness of 340 Hv and a tensile strength of 950 g, and had sufficient mechanical properties. Furthermore, this brush wire 7 had no scratches on its surface.

On the other hand, the same brush wire rod as in the above embodiment was straightened by the conventional method for straightening the wire rod, and the brush wire rod was pulled at a speed of 6.
Pass through the electric furnace at 750° while applying tension at m/win.
Heated to C and straight line finished, straightness 10 ml/
At 100 cm, a brush wire with sufficient straightness could not be obtained. Also, the hardness of this brush wire is 280Hv.
, the mechanical properties were insufficient with a tensile strength of 510 g.

The wire rod straightening jig 6 according to the present invention changes the route of the Teflon tube 5 passing between the pins 4 depending on the material, wire diameter, and hardness of the wire rod to be straightened, thereby changing the bent shape of the Teflon tube 5. It is subject to change.

(Effects of the Invention) As can be seen from the above explanation, according to the method for straightening a wire rod according to the present invention, sufficient straightness and hardness can be achieved by mechanical straightening.
．． A wire rod which can be straightened into a wire rod having high tensile strength and sufficient mechanical properties, and which is free from damage and scrap despite mechanical straightening can be obtained.

Further, according to the wire rod straightening jig according to the present invention, the above-described wire rod straightening method can be carried out smoothly, easily and reliably, resulting in good workability.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a wire rod straightening jig according to the present invention, FIG. 2 is a longitudinal side view thereof, and FIG. 3 is a longitudinal side view showing a method for straightening a brush wire with the straightening jig. be. 1--jig main body, 2.3-- tubular support shaft, 4-pin,
5 - Teflon tube, 6 - straight line correction jig, 7 - wire rod for brushes Applicant: Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (2)

[Claims] (1) A method for straightening a wire, which comprises passing the wire through a bent Teflon tube and rotating the Teflon tube in a direction perpendicular to the direction in which the wire travels, thereby straightening the wire. (2) A tubular support shaft is provided at both the front and rear ends, and a large number of pins are installed horizontally in the front-rear and up-down directions inside, and a Teflon tube introduced inside from the tubular support shaft at the front end runs between the many pins. A straightening jig for a wire rod, which is led out from a tubular support shaft at an upper and rear end that is appropriately bent in the vertical direction.