JPS6216832A - Core wire cutting device - Google Patents

Abstract

PURPOSE:To make the cutting shape of a core wire in a tapering and to cut without any formation of an oxidized film by drawing a core wire to both sides with melting in a gaseous atmosphere. CONSTITUTION:The core wire 12 straightened by a strainer part 11 is fed in a fixed quantity by the first cylinder 13 and chucked by chucking parts 14, 15. In this state a gas is fed by a gas atmosphere feeding device 22 and the cut part of the core wire 12 becomes in ignition melting state with the flow of a current from AC power source 16 as well as being enveloped in a gas atmosphere. In this state when one side of the core wire 12 is drawn to the left direction via the second cylinder 17 and chuck part 14 by the fourth cylinder 19, the core wire 12 is cut in a tapering off. Thereafter the core wire 12 cut by the fifth cylinder 20 is inserted into the hole of a CO tip. The easy insertion into the hole without being oxidized is thus enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a core wire cutting device for cutting iron-based metal wires such as piano wires without leaving any cracks in the cut portion.

Conventional technology As an example of the use of piano wire in the past, when manufacturing the 002 chip used at the tip of the welding torch of a CO2 welding machine, the following method was used to determine the diameter of the through hole of the CO2 chip. It was used.

FIG. 2 shows the shape of the Co2 chip 1. 2 is a hole formed in the Co2 chip 1. C02 as shown in Figure 2
When forming chip 1, cut the hexagonal bar, then
Insert a core wire (piano wire) with the same diameter as the required hole diameter and tap around the hexagonal bar, the hexagonal bar will become thinner and the hole 2 will have the same diameter as the core wire. When the core wire is pulled out from the hexagonal rod in this state, a Co2 chip 1 in which a hole 2 of a desired diameter is formed is obtained.

However, when pulling out the piano wire, if there are any cracks or foreign matter attached to the core wire when it is cut, the core wire will not be pulled out and the core wire will break midway. For this purpose, currently, the core wire is cut to a certain length and then barrel-polished to remove cut particles and adhering foreign matter.

Problems to be Solved by the Invention However, the core wires were bent during polishing, the polishing was insufficient, the equipment for feeding each CO2 chip one by one was complicated, and the number of production steps was high.

Means for Solving the Problems In order to solve the above problems, the core wire cutting device of the present invention includes a first means for applying an electric current to the core wire to be cut and melting the cut portion with the generated heat; The apparatus is equipped with a second means for pulling both ends of the core wire or both sides of the red-hot part, and a third means for supplying a gas atmosphere for preventing oxidation.

Effect: By the above means, the core wire is melted in a gas atmosphere while
Since it is pulled to both sides, the cut shape of the core wire becomes tapered and no oxide film is formed.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIG.

In FIG. 1, 11 is a part of a strainer that straightens the core wire (piano wire) 12, 13 is a first cylinder that feeds the core wire 12 by a certain amount, and 14 and 15 are chucks that chuck both sides of the cut portion of the core wire 12. At this point, a current is applied from the AC power source 16 to the cut portion through the chuck portion 14, 15 to bring the cut portion into a red-hot molten state. Reference numerals 17 and 18 are the second and third cylinders that support the chuck part 14 and 16, and the second cylinder door is connected to the fourth cylinder 19 in the figure.
A pulling force can be applied to the left. 20 is a sixth cylinder for inserting the core wire 12 into the hole of the positioned C02 chip 21 after cutting is completed, and 22 is a gas atmosphere supply device for supplying gas to the cut portion to form a gas atmosphere. In addition, the first
The chuck parts 14 and 15, the second cylinder 1
7, the third cylinder 18, and the fourth cylinder 19 constitute a second means.

In the above configuration, the core wire 12 straightened by the strainer part 11 is fed by a fixed amount by the first cylinder 13 and chucked by the chuck part 14.15. In this state, gas is supplied by the gas atmosphere supply device 22, and the cut portion of the core wire 12 is surrounded by the gas atmosphere, and
The stain current is caused to flow by the AC power source 16 and becomes red-hot and molten.

In this state, the fourth cylinder 19 causes the second cylinder 17 to
When one side of the core wire 12 is pulled to the left in the figure via the chuck portion 14, the core wire 12 is cut into a tapered shape.

After that, the cut core wire 12 is moved by the fifth cylinder 20.
Insert into the hole of 002 chip 21.

Therefore, the cut core wire 12 is not oxidized because it is in the gas atmosphere when it is red hot, and is cut into a tapered shape, so it can be easily inserted into the 2° hole of the GO□ chip, and the CO□ chip 20 It can also be easily extracted from. Note that foreign matter adhering to the hoop material of the core wire 12 may be removed using a cloth or the like on the inlet side of the strainer portion 11.

Effects of the Invention As described above, according to the present invention, it is possible to cut the core wire without causing any burr due to the cutting blade during cutting, and without forming an oxide film on the red-hot portion.

[Brief explanation of drawings]

FIG. 1 is a front view of a core wire cutting device showing an embodiment of the present invention, and FIG. 2 is a half-cut front view and side view of a C02 chip. 12... core wire, 14, 15... chuck part, 16... AC power supply, 17... second cylinder, 18...... th 3 cylinders, 19...
...Fourth cylinder, 22... Gas atmosphere supply device.

Claims (1)

[Claims] A first means of passing an electric current through the core wire to be cut and melting the cut part with the generated heat, a second means of pulling both ends of the core wire to be cut or both sides of the red-hot part, and a method for preventing oxidation. A core wire cutting device comprising a third means for supplying a gas atmosphere.