JP2004019051A - Heald bar and method for producing the bar - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heald bar not only having excellent abrasion resistance but also hardly causing breakage. <P>SOLUTION: The heald bar has a center part 12 having 430-500 Hv hardness at the center in the width direction, and edge parts 11 having ≥470 Hv hardness higher than that at the center part 12 at both of the edges in the width direction. The heald bar is produced by rolling the edge parts of a material plate in a long flat plate shape by rolls to form the cross sections of the edge parts into circular shapes and to partially heighten the hardness. <P>COPYRIGHT: (C)2004,JPO

Description

【００１３】
製造した各ヘルドバーのエッジ部および中央部についてビッカース硬さ（Ｈｖ）を調べた。また、ＪＩＳ　Ｇ０５７７に準拠する方法（３０℃の３．５％食塩水中での孔食電位を調べる）で耐食性試験を行った。また、耐摩耗性試験として、各ヘルドバーを織機（津田駒社製：ＺＷ４０３）に用いて通常の運転を１日当たり２４時間連続して行い、幅が７ｍｍになるまでの運転日数を調べた。これらの結果を、表２に併記する。
【００１４】
【表２】

【００１５】
表２から明らかなように、実施例１〜５のヘルドバーは、エッジ部の硬さが４７０Ｈｖ以上が確保されていることにより耐摩耗性が高く、また、Ｃｒ量の多い鋼種Ａ，Ｂを用いているので優れた耐食性を発揮することが認められた。一方、エッジ部の硬さが４５０以下の比較例１〜３のヘルドバーは耐摩耗性に劣っており、鋼種Ｃを用いた比較例３，４は耐食性に劣っていた。特に比較例４は５０日で腐食（錆び）が顕著に認められた。したがって、エッジ部の硬さが本発明のように規定され、かつＣｒ量が確保されていることにより、優れた耐摩耗性および耐食性が得られることが確認された。
【００１６】
【発明の効果】
以上説明したように、本発明によれば、幅方向両端のエッジ部の硬さを中央部の硬さよりも高くし、かつその硬さを規定したので、優れた耐摩耗性を有するとともに折れが生じにくいヘルドバーを提供することができるといった効果を奏する。
【図面の簡単な説明】
【図１】本発明に係るヘルドバーの一例を示す（ａ）側面図、（ｂ）断面図である。
【図２】本発明に係るヘルドバーの製造方法の一例を示す（ａ）側面図、（ｂ）断面図である。
【符号の説明】
１０…ヘルドバー、１０Ａ…素材板、１１…エッジ部、１２…中央部、
２０…ロール。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a heald bar, which is one of the components for a loom, and a method for manufacturing a bar similar to such a heald bar.
[0002]
[Prior art]
The heald bar constituting the loom is made of a long section steel having a length of, for example, about 1.5 to 4 m. During operation of the loom, the heald continuously contacts the edges at both ends in the width direction. For this reason, the edge portion is required to have high wear resistance, that is, high hardness. By the way, the conventional heald bar is manufactured by rolling a stainless steel round bar such as SUS304 or SUS420 into a flat plate by rolling, and the cross section of the edge portion is formed in a circular shape by this manufacturing method, so that the loom can smoothly move. It is being maintained. However, according to this manufacturing method, the center in the width direction is larger than the edge in terms of the degree of processing, so that the center is harder than the edge. As the hardness, for example, a numerical value such as 460 to 510 Hv at the center and 450 to 470 Hv at the edge was common.
[0003]
[Problems to be solved by the invention]
In the conventional manufacturing method, it is obvious that the hardness of the central portion needs to be further increased in order to increase the hardness of the edge portion. However, when the central portion is processed to a hardness of more than 500 Hv, for example, sudden breakage may occur during processing or during operation of the loom, which indicates that there is a limit in increasing the hardness of the edge portion. I have. Therefore, there has been a demand for a heald bar in which the edge portion has sufficient hardness but does not easily break.
Accordingly, an object of the present invention is to provide a heald bar having an edge portion having sufficient hardness and hardly causing breakage, and a method of manufacturing a bar similar to such a heald bar.
[0004]
[Means for Solving the Problems]
The heald bar of the present invention is characterized in that the hardness at the center in the width direction is 430 to 500 Hv, and the hardness at the edges at both ends in the width direction is higher than that at the center and is 470 Hv or more. As another parameter, the hardness at the center in the width direction is 430 to 500 Hv, and the hardness at the edges at both ends in the width direction is 10% or more higher than that at the center.
[0005]
According to the heald bar of the present invention, the hardness of the central portion is 430 to 500 Hv, and the edge portion is harder than the central portion as described above, so the edge portion has a sufficient hardness. The edge therefore exhibits excellent wear resistance. In addition, since the central portion can be suppressed to the above hardness, flexibility is ensured and breakage hardly occurs.
[0006]
In the heald bar of the present invention, the cross section of the edge portion is formed in a circular shape so that the loom can be smoothly moved, and the thickness of the edge portion is larger than the thickness of the portion other than the edge portion. This is a preferred mode.
[0007]
In the heald bar of the present invention, the components are as follows: C: 0.03 to 0.30 wt%, Si: 3.0 wt% or less, Mn: 3.0 wt% or less, Ni: 5.0 to 10.0 wt%, Cr: 15.0 to 25.0 wt%, N: 0.02 to 0.30 wt%, and the balance is made of stainless steel containing Fe and unavoidable impurities. This component is particularly characterized by a large amount of Cr, and therefore, the corrosion resistance is improved. Some looms use a water jet to pass the yarn through the yarn holes in the heald bar.In such a case, rust easily occurs on the heald bar. Can be suppressed.
[0008]
FIGS. 1A and 1B show an example of a heald bar according to the present invention. As shown in FIG. 1B, the heald bar 10 has a circular cross section at the edge portions 11 at both ends in the width direction. The edge portion 11 is thicker than the central portion 12 that is formed and has a uniform thickness between the edge portions 11. As an example of the dimensions, the overall width W is 9.5 mm, the thickness T1 of the edge portion 11 is 1.51 to 1.53 mm, the thickness T2 of the central portion 12 is 1.50 mm, and the length L is the length of the loom. Although it is appropriately determined according to the specification, it is approximately 1.5 to 4 m.
[0009]
Next, the method of manufacturing a bar of the present invention is a method of suitably manufacturing a bar such as the heald bar of the present invention, wherein the edge portions at both ends in the width direction of a long flat material plate are roll-rolled. The cross section of the edge portion is formed in a circular shape. Examples of the material plate include a long flat plate-shaped steel material. By rolling the edge portion of such a material plate, the edge portion can be locally harder than other portions. Further, by using a roll having an arc-shaped concave groove, the cross section of the edge portion can be formed in a circular shape as described above.
[0010]
FIG. 2A shows an example of the manufacturing method of the present invention. In this manufacturing method, a flat material plate 10A made of stainless steel having the above-described components is sandwiched between a pair of rolls 20 and 20, and the material plate 20 is moved in the longitudinal direction so that edges at both ends in the width direction are formed. Roll rolling. As shown in FIG. 2 (b), the roll 20 has an arcuate groove on the roll surface, which is a peripheral surface. The edge of the material plate 20 is pressed against the groove and plastically deforms. The edge portion has a circular cross section as shown in FIG. Roll rolling is performed in several stages, and it is desirable to perform water cooling immediately after one roll rolling is completed in order to suppress warping, bending, twisting, and the like due to heat generation.
[0011]
【Example】
Next, examples are presented to further clarify the effects of the present invention.
Table 1 shows the components of steel types A, B, and C. Steel types A and B are stainless steels within the composition range of claim 4 of the present invention, and steel type C is SUS420 type outside the range. Using these steel types A, B and C, heald bars of Examples 1 to 5 and Comparative Examples 1 to 4 shown in Table 2 were produced. The heald bar of Comparative Example 3 was manufactured by a conventional manufacturing method, that is, by rolling a round bar into a flat plate. Except for Comparative Example 3, it was manufactured by applying the method of the present invention shown in FIG. 2, that is, the method of rolling the edge portion of a flat material plate. The dimensions of each manufactured heald bar are 1.5 mm in thickness, 9.5 mm in width, and 2100 mm in length. In addition, a difference was produced in the hardness at the center by appropriately changing the rolling reduction during rolling.
[0012]
[Table 1]

[0013]
The Vickers hardness (Hv) was examined for the edge portion and the center portion of each manufactured heald bar. In addition, a corrosion resistance test was performed by a method according to JIS G0577 (investigating pitting potential in 3.5% saline at 30 ° C.). In addition, as a wear resistance test, each heald bar was used for a loom (manufactured by Tsuda Koma Co., Ltd .: ZW403), normal operation was continuously performed for 24 hours per day, and the number of operation days until the width became 7 mm was examined. These results are also shown in Table 2.
[0014]
[Table 2]

[0015]
As is clear from Table 2, the heald bars of Examples 1 to 5 use steel types A and B having high wear resistance due to the hardness of the edge portion being secured to 470 Hv or more, and having a large amount of Cr. Therefore, it was recognized that excellent corrosion resistance was exhibited. On the other hand, the heald bars of Comparative Examples 1 to 3 having an edge portion hardness of 450 or less were inferior in wear resistance, and Comparative Examples 3 and 4 using steel type C were inferior in corrosion resistance. In particular, in Comparative Example 4, corrosion (rust) was remarkably observed in 50 days. Therefore, it was confirmed that excellent wear resistance and corrosion resistance can be obtained when the hardness of the edge portion is defined as in the present invention and the Cr content is secured.
[0016]
【The invention's effect】
As described above, according to the present invention, the hardness of the edges at both ends in the width direction is made higher than the hardness of the central portion, and the hardness is specified, so that it has excellent abrasion resistance and breakage. It is possible to provide a heald bar that is unlikely to be generated.
[Brief description of the drawings]
FIG. 1A is a side view and FIG. 1B is a sectional view showing an example of a heald bar according to the present invention.
2A and 2B are a side view and a cross-sectional view illustrating an example of a method for manufacturing a heald bar according to the present invention.
[Explanation of symbols]
Reference numeral 10: heald bar, 10A: material plate, 11: edge portion, 12: central portion,
20 ... Roll.

Claims (5)

It is a long flat plate-shaped heald bar for loom, and the hardness at the center in the width direction is 430 to 500 Hv, and the hardness at the edges at both ends in the width direction is higher than the center, and is 470 Hv or more. A heald bar characterized by the following. A long flat plate-shaped heald bar for a loom, wherein the hardness at the center in the width direction is 430 to 500 Hv, and the hardness at the edges at both ends in the width direction is 10% or more higher than the center. Held bar. The heald bar according to claim 1, wherein a cross section of the edge portion is formed in a circular shape, and a thickness of the edge portion is larger than a thickness of a portion other than the edge portion. C: 0.03 to 0.30 wt%, Si: 3.0 wt% or less, Mn: 3.0 wt% or less, Ni: 5.0 to 10.0 wt%, Cr: 15.0 to 25.0 wt%, N The heald bar according to any one of claims 1 to 3, wherein the heald bar is steel containing 0.02 to 0.30 wt%, with the balance being Fe and unavoidable impurities. A method for manufacturing a bar, comprising rolling an edge portion at both ends in a width direction of a long flat material plate to form a cross section of the edge portion in a circular shape.

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