JPS57187116A - Roll-working method of cylinder - Google Patents

Abstract

PURPOSE:To improve the roundness of a blank material and to prevent the material from deformation flaw, and crack while keeping a biting condition well, by forming a shape of the material so as to make its tip contact with a next small roll at its whole end surface simultaneously when a blank material is inserted into between a main roll and a small roll. CONSTITUTION:A shape of cut edge 6, being the front end part of a blank material 1 in rolling direction, is formed to be in contact with a small roll 4 at the whole end part of the material 1 simultaneously, when the material is inserted into between a main roll 2 and the 1st small roll 3 to be in touch with the successive roll 4. Further, a shape of cut edge 6', which is the rear end part of the material 1, is formed to a male and a female fitting to the shape of the cut edge 6. Thus, when the material 1 is bitten by the small roll 3 and main roll 2, the material 1 touches the next roll 4 on its whole end part simultaneously and is bitten at its cut edge 6 to be pulled in smoothly conforming to the rotation of roll 4, and then is bent into a cylinder while receiving a bending load from a touching point E with the roll 3, a point F with the roll 2, and a point G with the roll 4.