JPS61199034A - Method for hardening metallic card cloth - Google Patents

Abstract

PURPOSE:To harden surely only the necessary tip parts of the teeth of metallic card cloth used in a carding machine for spinning with laser beams by forming films which absorb readily laser beams on the surfaces of the tip parts. CONSTITUTION:Metallic card cloth 3 consisting of teeth 1 and an edge 2 is treated by a prescribed method to give metallic luster by which laser beams 6 are readily reflected to the surface of the cloth 3. Films which absorb readily laser beams 6 are then formed on only the tip parts 4 of the teeth 1 to be hardened. Laser beams 6 are irradiated on the tip parts 4 to heat the parts 4 and the heated parts 4 are cooled. Thus, only the tip parts 4 are hardened.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for hardening metallic clothing used in carding machines in spinning.

Conventional Technology and Problems Conventionally, the method of hardening metallic clothing used in Chen cotton machines involves blowing a gas flame onto and around the tips of the teeth of the metallic clothing that is to be hardened. Considering the spraying time #! Under optimal conditions, the material is heated to a temperature that allows for sigma, and then quenched with water or oil for quenching.

However, the V8 heating method using gas flame requires the gas composition,
There are many factors that affect temperature rise, such as the length of the flame and the size of the burner, as well as the time required for quenching, making it extremely difficult to limit the area to be hardened to an optimal range. Therefore, as a means to solve this problem, a method has been proposed in which a laser beam is used and the sawtooth is irradiated in spots to harden the sawtooth.

However, laser beams have a high energy density and are effective in raising the temperature in a short time, but on the other hand, in the case of metal products such as metallic clothing, the reflectance of the surface is 9.
It can reach 0-95%, resulting in large energy loss, and slight differences in reflection can lead to variations in hardening, resulting in differences in hardness and problems in terms of wear resistance, breakage, etc. It becomes.

On the other hand, there is also a method of forming an oxide film on the surface through an annealing process etc. before hardening and irradiating it with a laser. , absorption. Because it is easy, it is made with a grilled fist. There is a problem in that it is difficult to selectively heat only the tips of the teeth where it is desired to increase the hardness by 1 or more, which increases the hardness of the entire tooth, causing problems in roller winding. Therefore, if the energy density is increased and the irradiation area is decreased,
It is extremely difficult to manage hardening based on energy density alone, as there is a continuing problem that the temperature rises too high and the tooth tip melts.

Furthermore, during the running of the metallic clothing during hardening, there are various problems such as vertical vibrations and fluctuations in feed speed, making it impossible to perform uniform hardening work.

Means for Solving the Problems The present invention solves the various problems mentioned above.It is an object of the present invention to solve the above-mentioned various problems by making at least the tip part of the metallic clothing before hardening and its vicinity a shiny metallic surface that easily reflects laser beams. Next, a coating that easily absorbs laser beams is formed on the tip of the tooth that requires aging and the surface around it, and then the laser beam is irradiated to the area where the coating is formed, and the difference in reflectance is used to completely harden the tooth. This method provides a method for completely heating and raising the temperature of only the necessary tooth tip portions, and hardening the tooth tip portions of meta-IJ and seven-piece clothing.

The present invention will be explained in detail below with reference to Examples.

Example 1 As shown in the drawings, metallic clothing consisting of teeth (1) and edges (2) formed by rolling a carbon steel 9 alloy steel wire or the like and punching out teeth is prepared in advance before quenching. Cutting oil and rolling oil commonly used on surfaces.

An oil agent that evaporates easily at low temperatures in place of oil agents such as rust preventive oil,
For example, a stearyl alcohol-based lubricant is applied with an applicator, and the oil is vaporized by heating with non-oxidized rich oil in the annealing process before quenching, and the surface of the metallic clothing is treated to have a metallic luster. An ink containing a laser beam absorbing agent, such as manganese phosphate, carbon, etc., is applied by a coating device (5) only to the tooth tips (4) that require hardening, and then dried.

Next, the laser beam (6) is emitted by the laser beam irradiation device.
The tooth tips that have been coated with the above-mentioned ink film, which requires T-hardening, are irradiated, heated to a high temperature, and then cooled down. A metallic clothing with excellent abrasion resistance was formed.

In addition, 90-95% of the laser beam is reflected from a shiny metallic surface, and only about 50% is reflected from an ink-coated surface, so only the ink-coated area is rapidly heated to a temperature that can be hardened, but the surrounding area is It is suppressed to below the quenching temperature and is not quenched.

Therefore, if the laser beam to be irradiated is narrowed down to a minute spot diameter and the energy density is set to a relatively low energy density with a wide spot diameter without increasing the energy density, it will be possible to reliably heat and harden only the tip of the tooth where the ink is coated, and the uncoated tooth tip will be heated and hardened. Although most of the parts are not hardened due to reflection, and the vibration of the metallic clothing and the feeding speed are uneven, it is possible to completely harden only the tooth tips.

Also, before annealing, deposits may be removed by cleaning instead of applying oil, which easily evaporates. Furthermore, the ink coated film that easily absorbs laser beams can be formed not only by ink but also by spot-colored paint, resin, or coating.

Effects of the Invention As described above, the present invention, when phosphorizing metallic clothing with a laser beam, does not require hardening of the teeth even if vibrations of the metallic clothing, fluctuations in feed speed, or fluctuations in laser output occur. It is possible to heat the teeth to a temperature that allows only the tooth tips to be reliably hardened, and also eliminates the occurrence of melting due to excessive temperature rises, ensuring that only the tooth tips are completely hardened. can increase hardness and create a wear-resistant surface. Further, since the edges are not hardened, the winding can be easily carried out without breaking inside the winding.

In addition, the hardened part reaches a high temperature in a short period of time and is hardened by self-cooling or forced cooling in an instant, resulting in a dense hardened structure, high hardness and excellent wear resistance, and a high-production card machine. This invention has various effects such as making it possible to produce high-quality webs for a long period of time even when used for.

[Brief explanation of drawings]

The drawings are schematic process diagrams showing one embodiment of the present invention. +1+...Tooth, (2)...Edge, River...Meta I
J, 7-piece clothing, (4)...Tooth tip, (6)...Applying device, (6)...Laser beam

Claims (1)

[Claims] Before hardening the metallic clothing consisting of teeth and edges, at least the tips of the teeth and their surroundings are made to have a metallic shiny surface that easily reflects laser beams, and the laser beam is applied to the metallic shiny surfaces. After forming a coating layer that is easy to absorb, a laser beam is irradiated to the portion where the coating layer is formed, and the temperature is raised to a temperature at which the tooth tip and its surroundings that require hardening can be hardened due to the difference in reflectance. How to harden metallic clothing.