JPS58154449A - Production of roll made of cast iron having core shaft made of steel - Google Patents

Abstract

PURPOSE:To improve the adhesion between a core shaft part made of steel and a body part made of cast iron in the stage of producing a roll made of cast iron having the core shaft made of steel by enclosing the core shaft made of steel having required strength over the entire part from both bearing parts to the body part. CONSTITUTION:In the stage of producing a roll made of cast iron having a core shaft made of steel, a core shaft 1 made of carbon steel which is formed as slender as possible within the range where the shaft withstands the bending force by external load as a roll is enclosed by cast iron with the body part 3 including the bearing parts 2 at both ends as a roll. Since the shaft 1 is relatively small in diameter, it has small heat capacity, and the shaft 1 and the cast iron part are melt stuck to each other and are bonded firmly by the heat possessed by the molten cast iron in the stage of insert casting.

Description

【発明の詳細な説明】 本発明は、鋼製芯軸を持った鋳鉄製ローラの製造法に係
わり、詳わしくは鋼製材を芯軸として完全な鋳ぐるみ状
に鋳造される鋳鉄製ローラの製造法に関するものである
。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a cast iron roller having a steel core shaft, and more specifically, to a method for manufacturing a cast iron roller having a core shaft made of steel, which is cast into a complete cast shape. It concerns the manufacturing method.

一般にｍｉローラに代わる鋳鉄製ローラを考える場合、
その機械的強度面から、鉄心補強が必要であり、従来よ
りローラ用鋳型内に鋼製芯軸を入れローラ部全鋳造する
ことによ如、鋼製芯軸を持った鋳鉄製ローラを製造する
ことは周知である。Generally speaking, when considering a cast iron roller to replace the mi roller,
In terms of mechanical strength, iron core reinforcement is required, and conventionally a cast iron roller with a steel core shaft is manufactured by placing a steel core shaft in a roller mold and casting the entire roller part. This is well known.

しかし、上記従来法では芯軸の途中にローラ部を融着結
合させるよう、第１図または第２図に示すような芯軸側
に適宜の四部または孔を設けて両者の一体化を計ってい
るが、なお充分ではなく、使用中に両者が分離するとい
う不都合があった。However, in the above conventional method, in order to fuse and connect the roller part in the middle of the core shaft, appropriate four parts or holes are provided on the core shaft side as shown in Fig. 1 or 2 to integrate the two. However, it is still not sufficient, and there is a problem that the two separate during use.

更に従来法では芯軸側に凹部や孔を設けているためにそ
の部分の強度が弱いという欠点もあった。Furthermore, the conventional method has the disadvantage that the strength of that part is weak because a recess or hole is provided on the core shaft side.

本発明は、上記問題点を解消する方法を提供するもので
あり、すなわち外荷重に堪え得る炭素鋼芯軸を、その両
端軸受部から所定形状の胴部に亘って全体的に鋳ぐるむ
ことを特徴とするものである。The present invention provides a method for solving the above-mentioned problems, namely, by casting a carbon steel core shaft capable of withstanding external loads entirely from the bearings at both ends to the body of a predetermined shape. It is characterized by:

以下これを第６図に示す一実施例に基づき詳細に説明す
る。This will be explained in detail below based on an embodiment shown in FIG.

本発明方法は例えば鋼管積載時等の外荷重による曲げ力
のみに堪え得る範囲で可及的に細く形成した炭素鋼の芯
軸（１）を、両端の軸受部（２）から例えば鋼管積載部
位である鼓状形成された胴部（３）に亘って全体的に鋳
ぐるむことで前記芯軸（１）と軸受部（２）及び胴部（
３）とを強固に融着するものである。In the method of the present invention, for example, a core shaft (1) of carbon steel made as thin as possible within a range that can withstand only the bending force due to an external load such as when loading steel pipes is inserted from the bearing parts (2) at both ends to the loading area of the steel pipes, for example. The core shaft (1), the bearing part (2) and the body part (
3) and firmly fused together.

すなわち、従来と比較して芯軸（１）が細く形成されて
いる為、鋳造時における芯軸（１）温度が従来よリ１．
’Ａ　（なり、よって製造され九ローラにおける芯軸（
１）と軸を部（２）及び胴部（３）との融着が強固にな
る。That is, since the core shaft (1) is formed thinner than the conventional one, the temperature of the core shaft (1) during casting is lower than that of the conventional one.
'A (becomes, therefore, the core shaft in nine rollers manufactured (
1), the shaft portion (2) and the body portion (3) become firmly fused.

（実施例） 前記芯軸（１）を５４５０の材質で直径４０Ｔｎｍ、長
さ７２０＋＋１ｍに形成し、その周囲をｙｏＤ６［１で
鋳込み軸受部（２）の径を７５ｍ、胴部（３）の径を１
８０ｍｍに形成した本発明性実施によるローラと、　　
ｓ４５゜の材質で直径８３ｍ長さ７２０謳の軸部を形成
し、その周囲を本発明と同一なＦＯＤ６０で鋳込み、胴
部の径を１８０錫に形成した従来法によるローラとをそ
の耐久性及び強度面について比較した結果を下表に示す
。(Example) The core shaft (1) is made of 5450 material and has a diameter of 40Tnm and a length of 720++1m, and its surroundings are yoD6[1, the diameter of the cast bearing part (2) is 75m, and the diameter of the body part (3). 1
a roller according to the inventive implementation formed with a diameter of 80 mm;
The durability and durability of the roller was compared with a conventional roller in which a shaft part with a diameter of 83 m and a length of 720 mm was formed from a material of s45°, the periphery of the shaft was cast with FOD60, which is the same as that of the present invention, and the diameter of the body was formed with a diameter of 180 tin. The table below shows the comparison results in terms of strength.

以上の如く１本発明方法によれば芯軸に特別なＩＪ（］
工を施す必要もなく鋳鉄を安定して融着結合できるもの
であり、その耐久性も上記実施結果から（３） 第１［ 従来のめ１０倍に向上するものである。As described above, according to the method of the present invention, a special IJ (]
Cast iron can be stably fused and bonded without the need for any additional work, and its durability is 10 times greater than the conventional method, based on the results of the above implementation.

また、本発明では芯軸を鋼管積載の外荷重による曲げ力
のみに堪え得る範囲で可及的に細く形成しているため、
その炭素鋼の使装置をも減少させることができ、コスト
面に於いても従来より低減させることができるものであ
る。In addition, in the present invention, the core shaft is formed as thin as possible within a range that can withstand only the bending force due to the external load of loading steel pipes.
The use of carbon steel equipment can also be reduced, and costs can also be reduced compared to conventional methods.

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

第１図、第２図は従来法による鋼製芯軸を有する鋳鉄製
ローラの断面図、第３図は、本発明法による鋼製芯軸を
有する鋳鉄製ローラの断面図。 （１）は芯軸、（２）は軸受部、（３）は胴部。 特許出願人　　住友金属工業株式会社1 and 2 are sectional views of a cast iron roller having a steel core shaft made by a conventional method, and FIG. 3 is a sectional view of a cast iron roller having a steel core shaft made by the method of the present invention. (1) is the core shaft, (2) is the bearing part, and (3) is the body part. Patent applicant: Sumitomo Metal Industries, Ltd.

Claims (1)

【特許請求の範囲】[Claims] （１）、外荷重に堪え得る炭素鋼の芯軸を、その両端軸
受部から所定形状の胴部に亘って全体的に鋳ぐるむこと
を特徴とする鋼製芯軸を有する鋳鉄製ローラの製造法。(1) A cast iron roller with a steel core shaft, characterized in that a carbon steel core shaft capable of withstanding external loads is entirely cast from the bearings at both ends to the body of a predetermined shape. Manufacturing method.