Ring rolling mill and ring rolling method

Abstract

A ring rolling mill comprising a main roll and a mandrel capable of moving toward and away from each other, and rolling the circumferential portion of a ring-like body in the radial direction while rotating the ring-like body along the circumferential direction under such a state that the circumferential portion of the ring-like body is held in the radial direction thereof between the outer circumferential surface of the rotary driven main roll and the outer circumferential surface of the rotatable mandrel. The rolling mill further comprises a mechanism for supporting the mandrel kept inclined from the rotary axis of the main roll such that the gap between the outer circumferential surfaces of the mandrel and the main roll on one side is difference from that on the other side when viewed in the direction along the rotary axis of the main roll.

Description

technical field

[0001] The present invention relates to a ring rolling mill and a ring rolling method for radially rolling the peripheral portion of a ring body.

[0002] This application is based on Japanese Patent Application No. 2006-089759, and the contents thereof are incorporated herein. Background technique

[0003] For example, in the conventional ring rolling mill disclosed in Patent Document 1, the peripheral portion of the annular body is sandwiched between the outer peripheral surface of the rotationally driven main roll and the outer peripheral surface of the rotatable mandrel in the radial direction. Next, while rotating the annular body in the circumferential direction, the above-mentioned peripheral portion is radially rolled. In addition, in the conventional ring rolling mill, the peripheral portion of the annular body is radially rolled on the respective outer peripheral surfaces by making the main roll and the mandrel relatively close to or away from each...

Images