JPS5943862A - Wire bar and its production - Google Patents

Abstract

PURPOSE:To obtain a wire bar having improved hardness and abrasion resistance by winding and fixing densly a stainless steel wire on a stainless steel rod form a raw wire bar then subjecting the raw wire bar to an ion nitriding treatment. CONSTITUTION:A stainless steel wire having a polished surface is densely wound on a stainless steel rod having a polished surface and the head and tail of the wire is fixed to the rod to manufacture a raw wire bar. The raw wire bar are set in an ion nitriding furnace where gaseous nitrogen is introduced and with the furnace body as anode and the raw wire bar as cathode the wire bar is subjected to a nitriding treatment. At least the surface part of the wire is converted to nitrided steel having >=1,000Hv hardness and the smooth and abrasion resistant surface is formed by the above-mentioned method. The wire bar is used for the part where the paint coating by a painter is finished or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a so-called "wire bar" used for finishing parts in paint coating using a coating machine, and a method for manufacturing the same.

There are various methods of coating machines used to coat paper, film, etc. with various types of paints, and a specific method is adopted alone or in combination, taking into consideration the properties of the product and paint. There is. The present invention focuses on a "rod coater", "bar coater" or "metering metering bar"). According to the bar coater method, first, an excessive amount of paint is applied to the material to be treated by an applicator roll, and then the excess is scraped off by the bar, and the coated surface is finished to a uniform thickness to form a good finish. This bar is generally a round bar with a polished surface and a diameter of about 3 to 20 mm, and its material is usually stainless steel to avoid rusting. Furthermore, some bars are not completely round, but have thin grooves cut into them, or have a satin finish, depending on the properties of the paint, the purpose of the product, etc. Furthermore, in order to make the coating surface more precise, a round rod like the one described above was used as a core material, and a diameter of 0.0 mm was added to it.
There is a bar made by winding extremely thin stainless steel wire with a harmonic degree of 2 to 1.0, and this is called a "wire bar".

Since the wire bar is rotated in contact with the coating surface, it subtly smoothes the coating applied to the material to be treated to form a smooth and uniform coating surface, while also controlling the thickness of the wire wound around the core material. It has the advantage that the amount of application can be significantly adjusted depending on the situation. For example, according to the "Paper Processing Handbook" (published in 1980), the range of adjustment of the application amount is as follows: for paint with a viscosity of 3 (centipoise), the round bar method is 5 to 1 (JV).
/r wire bar one type 5 to 5017 m'', wire bar one type is significantly advantageous.

However, as is obvious from its structure, wire bars are more expensive than round bars, and they also have the disadvantage of having a relatively short useful life, depending on the quality tolerance of the coated product. . Regarding the effective lifespan, since the winding of this wire bar is an extremely thin metal wire,
Even if the degree of wear due to use is slight, the denting rate at the outer periphery of the cross section of the winding is quite high, and therefore, scratching the paint will cause subtle changes in the amount of paint applied, resulting in a decline in product quality. Furthermore, if the wire breaks due to wear during use, the wire may bounce due to its restoring force, causing damage to the product itself.

Naturally, in order to improve the wear resistance of the wire bar, it is conceivable to use a wire with higher hardness as the winding. Generally, there are various surface hardening methods to increase the hardness of metals, such as carburizing hardening, flame hardening, induction hardening, gas nitriding, salt bath nitriding, and ion nitriding. However, even if the hardness of the wire is increased using these methods, as the hardness increases, flexibility is lost and brittleness occurs, resulting in a wire having a strong rebound and restoring force against bending and becoming easily broken. In addition, if the wire is hardened only on the surface part in order to prevent it from breaking easily, cracks will occur on the surface part when the wire is bent. Therefore, even if the hardness of the wire itself were improved, it would be difficult to tightly wind the wire into a wire bar with a diameter of 2θ3 to IJI without causing bends or surface cracks. Rather than saying, it is impossible.

Due to the existing technical common knowledge as described above, conventional wire bars are constructed by winding untreated stainless steel wire with a hardness of about 200Hν around a core iron, or in cases where particularly high hardness is required. It is constructed by applying chrome plating to this wire bar (the hardness of chrome plating depends on the condition of the plating layer, but it is about 400~
600Hν).

Even if this chrome plating improves the hardness of the wire,
Since the chrome plating layer is originally porous, the wear resistance is not sufficiently improved even though the hardness is increased, and uniform plating is difficult, and uneven thickness of the plating layer is likely to occur. It is impossible to avoid the occurrence of so-called defects when the accuracy of the image is reduced.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a wire bar and a method for manufacturing the same, which can completely avoid and overcome the above-mentioned deficiencies in conventional wire bars.

In the wire bar according to the present invention, at least the surface portion of the core rod and the wire wound on the core rod is made of nitrided steel,
It is characterized by a hardness of 1000 Hv or more.

According to the method of the present invention, such a wire bar is obtained by tightly winding a stainless steel wire with a polished surface and fixing the starting and ending ends of the wire to the iron to form a wire bar base material. Then, the wire bar material can be ion-nitrided.

According to the method of the present invention, the hardening process is performed after the wire is wound one core at a time, so the hardening process reduces the resilience and restoring force that the wire originally had against bending.
Therefore, since the wire maintains a good coiled state after the hardening process, the wire bar according to the present invention is extremely stable in use, and even if the wire breaks due to wear of the temporary stand, the broken part of the wire will not bounce off. There is no risk of damaging the product. Moreover, according to the method of the present invention, the ion nitriding method is adopted for the hardening treatment, and the treatment temperature is relatively low (and the treatment time is also relatively short), so that the deviation and distortion during the hardening treatment are extremely small. This has the advantage that the accuracy of the original wire bar is maintained even after the hardening process, so there is no need for re-correction.

will be explained in detail.

Production example Stainless steel wire (SU
S304 (diameter: 0.08+ nm) was tightly wound using a conventional method, and the starting and ending ends of the wire were fixed to the rod to produce a wire bar material.

This wire bar material is set in an ion nitriding furnace, the air inside the furnace is circulated, nitrogen gas (if necessary, a mixture with hydrogen gas, etc.) is introduced, the furnace body is used as an anode, and the wire bar material is was used as a cathode and a direct current was passed through it to generate a glow discharge. After the temperature of the wire bar material reached approximately 550° C., the temperature was maintained for approximately 2 hours and ion nitriding treatment was performed.

The surface hardness of the wire portion of the wire bar thus obtained was approximately 1200 Hν, and the hardness of both the wire portion and the core rod portion was approximately 1000 to 1100 Hν up to a depth of approximately 20μ.
It had a hardness of Hv. The surface of the wire part is extremely smooth, and when this wire bar was compared with a correspondingly manufactured chrome-plated tweezer bar, the wear resistance was 3 to 5 times higher, and a significant difference in useful life was observed. Ta.

Patented Tanfu Kano Shoji Co., Ltd. Representative patent attorney Toji Tashiro

Claims (2)

[Claims] (1) In a wire bar in which a stainless steel wire is tightly wound on a stainless steel wire, at least the surface portion of the rond and the wire is made of nitrided steel, and the hardness is 100OHν.
A wire bar characterized by the above. (2) Table i A wire bar base material is formed by tightly winding a surface-polished stainless steel wire around a polished stainless steel wire, fixing the starting and terminal ends of the wire to the rond, and then ionizing the wire bar base material. How to make wire bars.