JPS61255736A - Production of elevator guide rail - Google Patents

Abstract

PURPOSE:To restore the ductility of the part which became brittle with its cleavage by re-crystalizing with cooling after heating locally the both leg parts formed by cleaving the end face of a metallic strip sheet by a wedge shaped tool. CONSTITUTION:Leg parts 1A, 1B are formed by cleaving a metal strip sheet 1 by a wedge shaped tool 2. In this case, a work hardening is caused by the pushing-in of the wedge shaped tool 2 on the cleaved part 3 and the surface layer part becomes hard and brittle. The work hardened part 3A is subjected to an annealing and normalizing by cooling it after heating by the flame 4A of a torch 4 since a crack may cause on the work hardened layer if it is elongated in T shape as it is. By performing said heat treatment, the mechanical property is restored with the recrystalization of the work hardened layer 3A and the crack is difficult to cause on the work part 3B even in case of forming in T shape by performing the bending thereafter.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は、横断面がＴ形、Ｔ形などの形材を製造するに
係り、特にエレベータのガイドレールに好適な製造方法
に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method of manufacturing a section having a T-shape, T-shape, etc. in cross section, and is particularly suitable for a guide rail of an elevator.

〔発明の背景〕[Background of the invention]

従来、エレベータのガイドレールは、実公昭４７−４２
３６１号公報に記載の、薄鋼板をロールフォーミングに
より略丁字形に折曲して形成したものや、丁字形の形材
を購入して切削したものであった。Conventionally, elevator guide rails were developed in 1974-42
They were those that were formed by bending a thin steel plate into a substantially T-shape by roll forming, as described in Japanese Patent No. 361, or those that were purchased and cut into T-shaped shapes.

しかし、前者は中空構造のため使用範囲が限られている
。また後者は材料歩留りが悪い。However, the former has a hollow structure and has a limited range of use. Moreover, the latter has a poor material yield.

そこで、断面が短形をなす素材の端面を、ローラやカッ
タで裂開し１丁字形、工学形に加工することが考えられ
る。この場合、鋼材を裂開して所定の形状に成形するに
は、大きな加工力を要し、この加工力のため、加工部は
加工硬化して脆くなるという問題がある。Therefore, it is conceivable to split the end face of a material with a rectangular cross section using a roller or a cutter and process it into a 1-C shape or an engineering shape. In this case, there is a problem in that a large working force is required to split the steel material and form it into a predetermined shape, and this working force causes the processed part to work harden and become brittle.

〔発明の目的〕[Purpose of the invention]

考発明の目的は、金属帯板を裂開したため脆くなった部
分の延性を回復させるエレベータガイドレールの製造方
法を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing an elevator guide rail that restores the ductility of a portion that has become brittle due to splitting of a metal strip.

〔発明の概要〕[Summary of the invention]

本発明は、楔状工具を用いて金属帯板の端面を裂開した
後、裂開して形成した両脚部を局部的に加熱して冷却し
、再結晶化させることにより、機械的性質を回復させる
ようにしたものである。The present invention recovers mechanical properties by tearing the end face of a metal strip using a wedge-shaped tool, and then locally heating and cooling the legs formed by the split to recrystallize it. It was designed so that

〔発明の実施例〕[Embodiments of the invention]

以下、本発明の一実施例を添付図面により詳説する。 Hereinafter, one embodiment of the present invention will be explained in detail with reference to the accompanying drawings.

第１図は、本発明に係る長尺形材の製造方法の一例を示
したものである。第１図（ａ）において。FIG. 1 shows an example of a method for manufacturing a long profile according to the present invention. In FIG. 1(a).

金属帯板１は、第１図（ｂ）のごとく、楔状工具２によ
り裂開され１脚部ＩＡ、ＩＢが形成される。As shown in FIG. 1(b), the metal strip 1 is torn apart by a wedge-shaped tool 2 to form one leg portion IA, IB.

このとき、裂開された部分３では、楔状工具２の押込み
により、加工硬化が発生し、表層部は硬く脆くなる。こ
れをこのまま第１図（ｄ）のごとく曲げると、加工硬化
している表層部３Ｂが伸ばされるため、加工条件、素材
によっては、伸びが不足して、加工硬化層で割れが発生
することがある。At this time, in the split portion 3, work hardening occurs due to the pushing of the wedge-shaped tool 2, and the surface layer portion becomes hard and brittle. If this is bent as shown in Figure 1(d), the work-hardened surface layer 3B will be stretched, so depending on the processing conditions and material, the elongation may be insufficient and cracks may occur in the work-hardened layer. be.

この加工硬化層での割れを防ぐには、加工硬化層を焼な
ましたり、焼ならしたりして再結晶化して機械的性質を
回復させればよい。In order to prevent cracking in this work-hardened layer, the work-hardened layer may be annealed or normalized to recrystallize it and restore its mechanical properties.

したがって、第１図（ｃ）のごとく、加工硬化した部分
３Ａをトーチ４の火焔４Ａにより加熱して冷却すること
により焼なまし焼ならしを行う。Therefore, as shown in FIG. 1(c), the work-hardened portion 3A is heated by the flame 4A of the torch 4 and cooled to perform annealing and normalization.

この熱処理を行うことにより、加工硬化層３Ａは再結晶
して機械的性質が回復する。この後第１図（ｂ）のごと
く曲げを行っても加工部３Ｂは、素材と同等の伸びを持
つため、割れは発生し難い。By performing this heat treatment, the work-hardened layer 3A recrystallizes and recovers its mechanical properties. Even if the processed portion 3B is bent as shown in FIG. 1(b) after this, cracks are unlikely to occur because the processed portion 3B has the same elongation as the raw material.

なお、本実施例では、加熱の方法の一例として火焔によ
る方法を示したが、加工硬化層３Ａを加熱できる方法な
らばいずれの方法でも良い。たとえば、電子ビーム、高
周波誘導加熱、プラズマなどがある。In this embodiment, a method using flame is shown as an example of the heating method, but any method that can heat the work-hardened layer 3A may be used. Examples include electron beams, high frequency induction heating, and plasma.

また、本実施例では、裂開を一方向側からのみ行った場
合を示したが、両側から同時に裂開すれば、工形の形材
を製造できる。さらに、この工形の形材の中央部を切断
することにより、同時に２本のＴ形の形材を製造するこ
とができる。Further, in this example, the case where the tearing was performed only from one side was shown, but if the tearing is performed from both sides simultaneously, a shaped material can be manufactured. Furthermore, by cutting the central part of this shaped section, two T-shaped sections can be manufactured at the same time.

第２図は１本発明に係る長尺形材の製造方法を実施する
ための装置の一例を示したものである。FIG. 2 shows an example of an apparatus for carrying out the method for manufacturing a long shape according to the present invention.

第２図において、供給装置１１により金属帯板１は裂開
装置２１に導入される。裂開装置２１では、第１図（ｂ
）のどとく裂開が行われる。この後、加熱袋Ｗ４１で第
１図（ｃ）のごとく、加工硬化層の加熱が行われる。加
熱された金属帯板１ｃは。In FIG. 2, the metal strip 1 is introduced into a tearing device 21 by means of a feeding device 11. In the tearing device 21, as shown in FIG.
) Throat dehiscence is performed. Thereafter, the work-hardened layer is heated using the heating bag W41 as shown in FIG. 1(c). The heated metal strip 1c.

冷却室４２に導入され、冷却されたのち、成形装置５１
により、第１図（ｄ）のごとく、両脚部を対称に成形さ
れる。この金属帯板を切断機５２により測長切断し、長
尺形材５として搬出装置５３により搬出される。After being introduced into the cooling chamber 42 and cooled, the molding device 51
As a result, both legs are molded symmetrically as shown in FIG. 1(d). This metal strip is cut to length using a cutting machine 52, and is transported out as a long shape member 5 by a transport device 53.

なお１本実施例では、長尺形材の製造を一連で行うライ
ンとして説明したが、各工程を個別に行ってもよい。Although this embodiment has been described as a line in which the production of elongated shapes is carried out in series, each process may be carried out individually.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、金属帯板の裂開による加工硬化のため
に脆くなった部分の機械的性質を回復することができる
ので、成形工程による割れの発生、拡大を防ぐことがで
きる。According to the present invention, it is possible to restore the mechanical properties of a portion that has become brittle due to work hardening due to splitting of the metal strip, and therefore it is possible to prevent the occurrence and expansion of cracks during the forming process.

さらに、残留応力を除去することができるため。Furthermore, because residual stress can be removed.

信頼性を向上させることができる。Reliability can be improved.

【図面の簡単な説明】[Brief explanation of drawings]

第１図（ａ）〜（ｄ）は本発明に係るエレベータガイド
レールの製造方法の一実施例の概略を示す略示図、第２
図は本発明に係るエレベータガイドレールの製造方法を
実施するための製造装置の一側を示す側面図である。 １・・・金属帯板、２・・・楔状工具、３・・・加工硬
化部、早・Ｉ　呂 第　２　目1(a) to 1(d) are schematic diagrams illustrating an embodiment of the method for manufacturing an elevator guide rail according to the present invention;
The figure is a side view showing one side of a manufacturing apparatus for carrying out the method for manufacturing an elevator guide rail according to the present invention. 1...Metal band plate, 2...Wedge-shaped tool, 3...Work hardening part, early/Iro 2nd item

Claims (1)

【特許請求の範囲】[Claims] １、金属帯板の端面を長手方向の全長にわたつて楔状工
具で裂開し、二つの脚部を形成した後、該当部分を局部
的に加熱して冷却する熱処理を行う第１の工程と、前記
両脚部を対称となるように成形する第２の工程とよりな
ることを特徴とするエレベータガイドレールの製造方法
。1. A first step of splitting the end face of the metal strip over the entire length in the longitudinal direction with a wedge-shaped tool to form two legs, and then performing heat treatment to locally heat and cool the corresponding part. A method for manufacturing an elevator guide rail, comprising: a second step of molding both legs symmetrically.