Patent ID: 6178637
Filing Date: 2001-01-30
Classification: B23P,B24B,Y10T

Abstract:
A process for producing rotationally symmetrical valve seat faces with a high surface quality on fuel injection valves for internal combustion engines, which comprises forming at least one inclined valve seat face on a valve seat body, forming a tool body in a shape of a ball, directing the valve seat face of the valve seat body into contact with a face of said tool body, and moving both the valve seat body and the tool body relative to each other in a rotational movement, applying a compression force (18) onto said tool body against the valve seat face (81) of the valve seat body (74) thereby elastically deforming the valve seat face (81) and the tool body (15) along contact faces of the tool body and the valve seat face, rotating the valve seat body (74) around a valve seat body axis (77) and rotating the tool body (15) around a tool body rotational axis (17), and the valve seat body axis (77) and the tool body rotational axis (17) are always inclined in relation to each other and a constant angle is maintained between the valve seat body axis and the axis of the tool body to achieve a relatively broad smoothing trace without a significant indentation thereby forming a valve seat face of high surface quality before the valve is used.