JP2909774B2 - Heat treatment method of metallic wire for spinning machine - Google Patents

Abstract

PURPOSE:To improve both abrasion resistance of a wire having a large tooth part such as a metallic wire, especially a garnet wire and efficiency of heat- treating operation. CONSTITUTION:The aforementioned method is characterized as follows. A metallic wire is formed into a prescribed shape and annealing treatment is then carried out by high-frequency induction heating. Only a tooth part of the metallic wire is subsequently heated while alternately and continuously applying voltages at different frequencies using a double frequency induction heater and then cooled to carry out hardening treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of heat-treating a metallic wire used in a carding machine or an air spinning machine of a spinning machine, and more particularly to a high-frequency heat treatment of a garnet wire such as a take-in wire and an interlock wire. .

[0002]

2. Description of the Related Art Conventional heat treatment of a conventional metallic wire for spinning machine is performed by forming into a predetermined shape by rolling and punching, and then heating in a continuous furnace of several meters using city gas, natural gas or electricity as a heat source. In order to eliminate stress, a heat treatment method is performed in which the tip of the metallic wire is hardened by flame quenching and tempered in a continuous furnace of several meters by gas or electricity.

However, under severe operating conditions in recent spinning mills, higher wear resistance is required, and special alloy steel wires containing a large amount of carbide may be used. However, according to the conventional heat treatment method, the alloy steel wire has less carbide mixing and martensite formation than carbon steel wire, has insufficient martensite, has high hardness only at the tooth tip, and has insufficient hardness below the tooth tip. As a result, there is a problem that it does not contribute to the improvement of the wear resistance for the expensive material.

[0004] Further, if the quenching heating time is lengthened to make a large amount of carbides form a solid solution and martensite is formed in a wide range of teeth, in flame quenching, the hardness increases to the valley of the metallic wire, and the metallic wire is applied to the roller. At the time of winding, there is a problem that the elongation of the valley decreases, a crack is generated from the portion, and the metallic wire is cut.

Heating and cooling may be performed using a high-frequency induction heating device having a high frequency for quenching. However, extreme hardening is liable to occur, in which the entire valley is hardened from the tooth surface layer or the teeth. If a metallic wire that has been cured only on the surface of the part is used, the uncured part at the tip of the tooth part is exposed to periodically grind the tooth tip as a carding machine, or there is a problem that wear is accelerated, or The above-described problem of hardening to the valley has occurred. Furthermore, since a long annealing furnace, a tempering furnace, and a quenching burner are used, there is a problem that work efficiency is lowered due to deterioration of a work environment due to a rise in temperature in a heat treatment plant due to heat radiation.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the conventional heat treatment method for metallic wires for spinning machines. After forming into a predetermined shape by rolling and punching, high-frequency induction heating with a low single frequency is performed. Perform annealing treatment with
Then, using a high-frequency double-frequency induction heating device, the teeth of the metallic wire are rapidly heated while alternately applying time-division different-frequency voltages alternately and continuously, and self-cooling or a cooling medium such as water. The present invention provides a heat treatment method for producing a metallic wire for a spinning machine having high wear resistance by quenching and quenching to harden the teeth over a wide range.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. As a material, a hard steel wire (C: 0.82%) is used, and the take-in wire 1 for a carding machine having a predetermined shape as shown in FIGS. 1A and 1B is formed by rolling and punching.

First, as an annealing process, the entire metallic wire is heated for 1 to 2 seconds by high-frequency induction heating at a low frequency of 500 KHz, and then gradually cooled. As quenching after slow cooling, the same heating coil is used for different frequencies (1 MHz and 10 MHz) using a high frequency double frequency induction heating device.
After continuously cooling the teeth 3 except the valleys 2 of the metallic wire for 0.1 to 0.5 seconds while continuously applying the voltage of
Immediately by quenching immediately with water, heat treatment is continuously performed.

In addition, when the frequency is low, the inside of the tooth root of the metallic wire is heated, and when the frequency is high, the surface layer of the tooth portion is heated. The inside of the tooth portion and the surface layer can be uniformly heated.

By performing the above heat treatment, the tooth portion 3 is formed into a highly hardened portion 4, a hardened portion 5, and a non-hardened portion 6 as shown in FIGS. Further, as shown in FIG. 4, the surface hardness distribution curve A of the metallic wire for a spinning machine according to the heat treatment method of the present invention.
It was found that the hardness of the tooth tip 7 was increased as compared with the surface hardness distribution curve B of the metallic wire of the conventional heat treatment method, and the highly hardened portion of the ridge line 8 required as the effect of the metallic wire was widened. It is effective for those requiring a large amount of heating for quenching, such as garnet wires such as take-in wires and interlock wires.

A spinning test was carried out under the following conditions using the product A of the present invention according to the above embodiment and the conventional product B of the metallic wire for comparison test. Spinning test conditions Fiber: cotton 40 count Spinning amount: 450 gr / 6 yrds Rotation speed: cylinder 450 rpm Doffer 35 rpm Takein 1150 rpm According to the spinning test, the product A of the present invention has a total amount of passing fibers of 4
Conventional ton B has a total passing fiber amount of 250 t
On, wear increased and the life was extended, and the life extension of the present invention A was recognized.

On the other hand, according to the heat treatment method of the present invention, the line of the heat treatment step is shortened, the room temperature is hardly increased, the heating time is very short, and the scale generated on the surface of the metallic wire is small. The environment has improved, and work efficiency and quality have been improved.

[0013]

The metallic wire for spinning machine by heat treatment of the present invention has the effect that even if it is the same material as the conventional one, the teeth have a fine martensitic structure and have high hardness, so that the wear resistance to the fiber is improved. There is.

Further, the invention has excellent effects such as shortening the line of the heat treatment step, hardly increasing the room temperature, and improving the working environment.

[Brief description of the drawings]

FIG. 1 shows a metallic wire for a spinning machine obtained by a production method according to an embodiment of the present invention, wherein A is a front view and B is a side view.

FIG. 2 is a partially enlarged sectional view taken along the line AA of FIG. 1;

FIG. 3 is a partially enlarged sectional view taken along line BB of FIG. 1;

FIG. 4 is a surface hardness distribution curve diagram of a tooth portion of a metallic wire.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metallic wire 2 Valley part 3 Tooth part 4 Highly hardened part 5 Hardened part 6 Non-hardened part 7 Tooth tip 8 Ridge line

Claims (1)

(57) [Claims] 1. After forming into a predetermined shape using a hard steel wire or an alloy steel wire, an annealing treatment is performed by high frequency induction heating, and then only a tooth portion of the metallic wire is processed using a dual frequency induction heating device. A method of heat treating a metallic wire for a spinning machine, wherein a quenching process is performed by heating and cooling while alternately and alternately applying voltages of different frequencies.