Method for machining a workpiece

Abstract

A method for machining a workpiece in which a machine tool comprising a first and a second chuck devices is employed to machine the workpiece, the machine tool being used in which the first and the second chuck devices comprise a chuck main body, plural chuck jaws, a chuck jaw drive body, and a pressing member, the method comprising: machining a clamp part of the other end part of the workpiece in a state where one end part of the workpiece is clamped by the first chuck device; machining a clamp part of the one end part of the workpiece in a state where the clamp part of the other end part of the workpiece is clamped by the second chuck device; and executing desired machining on the workpiece in a state where each of the clamp parts are clamped by each of the chuck devices.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a conceptual view showing a production line of a crankshaft to which a method for machining a workpiece pertaining to the present invention is applied;

FIG. 2 is a conceptual view showing an example of a machine tool for implementing the method for machining a workpiece pertaining to the present invention;

FIG. 3 is an external appearance perspective view of a chuck device of the machine tool shown in FIG. 2;

FIG. 4 is a full front view of the chuck device shown in FIG. 3;

FIG. 5 is a full side cross-sectional view of the chuck device shown in FIG. 3;

FIG. 6 is a main part cross-sectional bottom view of the chuck device shown in FIG. 3;

FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. 5;

FIG. 8 is a main part cross-sectional side view showing the periphery of a pressing member of the chuck device shown in FIG. 3;

FIG. 9 is a main part cross-sectional side view showing the periphery of the pressing member of the chuck device shown in FIG. 3;

FIG. 10 is a conceptual cross-sectional view showing a spherical bearing of a centering mechanism of the chuck device shown in FIG. 3;

FIG. 11 is a main part cross-sectional side view of the chuck device;

FIG. 12 is a main part cross-sectional side view of the chuck device;

FIG. 13A and FIG. 13B are conceptual views showing a crankshaft machined mode produced by the machine tool shown in FIG. 2;

FIG. 14A and FIG. 14B are conceptual views showing a crankshaft machined mode produced by the machine tool shown in FIG. 2;

FIG. 15 is a conceptual view showing a crankshaft machined mode produced by the machine tool shown in FIG. 2;

FIG. 16 is a conceptual view showing a workpiece regripping mode of the machine tool shown in FIG. 2;

FIG. 17 is a conceptual view showing a workpiece regripping mode of the machine tool shown in FIG. 2;

FIG. 18 is a conceptual view showing a workpiece regripping mode of the machine tool shown in FIG. 2;

FIG. 19 is a conceptual view of a workpiece regripping mode of the machine tool shown in FIG. 2;

FIG. 20 is an external appearance full side view showing an example of the crankshaft; and

FIG. 21 is conceptual view showing a conventional production line for machining of a crankshaft.

Claims

1. A method for machining a workpiece in which a machine tool comprising a first chuck device for clamping one end part of the workpiece and a second chuck device for clamping the other end part of the workpiece is employed to carry out a machining operation on the workpiece, the machine tool being used in which the first chuck device and the second chuck device comprise a chuck main body fixedly arranged in a tip end of a main spindle, a plurality of chuck jaws arranged to move freely along a radial direction of the chuck main body, a chuck jaw drive body, provided concentrically with a center axis of the main spindle and the chuck main body, that moves advancingly and retreatively along the center axis, and a pressing member supported rotatably and tiltably by the chuck jaw drive body through a spherical bearing provided in a center region, and which is configured to clamp the workpiece by pressing a plurality of chuck jaw rods respectively linked with the plurality of chuck jaws using the pressing member in accordance with actuation of the chuck jaw drive body and by causing the plurality of chuck jaws to move in a radially inward direction,the method comprising the steps ofmachining a clamp part of the other end part of the workpiece in a state in which the one end part of the workpiece is clamped by the first chuck device and the other end part of the workpiece is released by the second chuck device;machining a clamp part of the one end part of the workpiece in a state in which the clamp part of the other end part of the workpiece is clamped by the second chuck device and the one end part of the workpiece is released by the first chuck device; andexecuting desired machining on the workpiece in a state in which the clamp part of the one end part of the workpiece is clamped by the first chuck device and the clamp part of the other end part of the workpiece is clamped by the second chuck device.

2. The method for machining the workpiece according to claim 1, wherein the workpiece is a crankshaft starting material for manufacturing an engine crankshaft.