JPS61164739A - Steady rest device - Google Patents

Abstract

PURPOSE:To prevent the chattering vibration of a work during its machining by providing a work supporting arm so that it can rotate reversibly and move reciprocatorily toward a base stand fixed to a machine tool, and bringing the center of gravity of the supporting arm in coincidence with its rotational center. CONSTITUTION:A fork-shaped supporting element 7 of a base stand 6 formed in a body with a machine tool is provided with fitting holes 8 opposite to each other. Sliders 9 are inserted in the fitting holes 8 so as to freely slide in horizontal direction, and provided with axial holes 10 in which the both ends of a shaft 11 are rotatably fitted. The supporting element 7 of the base stand 6 is equipped with an arm body 12 for a work 4 to which the shaft 11 is fixed passing through it. The work 4 is mounted on a V-shaped groove 14 formed on the bottom of the notch 13 of the arm body 12, and pressed down by a screw 3a through a pressing element 3. The arm body 12 can rotate round the shaft 11 and reciprocate through the fitting holes 8, thus a supporting arm 15 is composed of the arm body 12 and pressing element 3.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a steady rest device mounted on a machine tool to provide steady rest during workpiece machining.

<Conventional technology> For long workpieces with center holes at both ends, a steady rest device is used to support the center of the workpiece in order to prevent deflection and vibration caused by cutting force during machining. I have to. For example, the steady rest device shown in FIG.
, the position can be adjusted and the workpiece 4 can be moved to p1.
The steady rest device shown in FIG. The center portion of the workpiece 4 is held by three pressers s3 radially provided on the device body 5 so as to be able to fix it in a desired position.

<Problems to be solved by the invention> In the conventional steady rest device, the position of the holding part relative to the workpiece is always constant, so vibrations occur in the workpiece due to changes in cutting resistance during machining, and the workpiece ME has a hearing point between which decreases.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a steady rest device that can prevent chatter from occurring during machining of a workpiece even if there is a change in cutting resistance.

Means for Solving the Problems> The present invention has a structure in which a support arm supporting a workpiece is rotatably supported on a base fixed to a machine tool via an axis parallel to the axis of the workpiece. and the shaft is capable of reciprocating with respect to the base in a direction perpendicular to the axis of the workpiece, and the shaft passes through the center of gravity of the support arm. .

Effect> In response to the chatter vibration of the workpiece, the support arms of the steady rest rotate or reciprocate as inertial masses, thereby suppressing the chatter of the workpiece. At this time, since the center of gravity of the support arm coincides with its center of rotation, the amount of the support arm does not apply any stress to the workpiece.

<Embodiment> As shown in FIG. 1 showing the schematic structure of an embodiment of the steady rest device according to the present invention and FIG. 2 showing the planar shape thereof, a bifurcated base 6 integrated with a machine tool (not shown) is Rectangular fitting holes 8 are provided in the support portions 7 that face each other. In this embodiment, these fitting holes 8 are set to be long in the horizontal direction (in the horizontal direction in the figure), and a slider 9 is inserted into these fitting holes 8 so as to be slidable in the horizontal direction. Each of the sliders 9 is provided with a shaft hole 10, and both ends of a shaft 11 are rotatably attached to the shaft holes 10 of a pair of opposing sliders 9, and the shaft 11 is inserted through the support portion 7 of the base 6. The arm main body 12 of the workpiece 4 fixed in this state is disposed. Then, the workpiece 4 is placed on the notch 13 [face V@i14 formed at the tip of the arm body 12, and the screw 3a
It is movably supported by a presser part 3 provided on the arm body 12.

Therefore, the arm body 12 can rotate around the shaft 11 and can reciprocate along the fitting hole 8, and the support arm 1
5 is diluted with acid. The center of gravity of the support arm 15 is configured to coincide with the center of the shaft 11, that is, the center of 1 gJ rotation of the support arm 15.

Therefore, when the workpiece 4 whose central part is supported by the support arm 15 of the steady rest device rotates eccentrically by the distance e from the rotation center 16ηλ of the tool 240, the support arm 15 rotates by the angle α and the angle 2e with respect to the base 6 rotates. Move back and forth over distance. As a result, the rotation and reciprocating motion of the support arm 15 each act as an inertial mass against chatter vibration in each direction during machining of the workpiece 4, thereby suppressing the chatter of the workpiece 4.

At this time, since one core of the support arm 15 coincides with its center of rotation, the weight of the support arm 15 does not apply bending stress to the workpiece 4, and there is no possibility that the machining accuracy of the workpiece 4 will deteriorate. .

<Effects of the Invention> According to the present invention, the support arm of the workpiece is provided so as to be able to rotate and reciprocate with respect to the base fixed to the machine tool, and one center of the support arm coincides with the center of rotation of the support arm. Therefore, chatter vibration of the workpiece during machining can be suppressed, and machining accuracy will not be reduced.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment of the steady rest device according to the present invention, FIG. 2 is a plan view thereof, and FIGS. 3 and 4 are front views of conventional steady rest devices, respectively. In the figure, 3 is a holding part, 4 is a workpiece, 6 is a base, 8 is a fitting hole, 9 is a slider, 11 is a shaft, 14 is a V hook part, and 15 is a support arm.

Claims (1)

[Claims] A support arm that supports a workpiece is rotatably supported on a base fixed to a machine tool via an axis parallel to the axis of the workpiece, and this shaft is connected to the axis of the workpiece with respect to the base. A steady rest device capable of reciprocating in a direction perpendicular to the center of the support arm, the shaft passing through the center of gravity of the support arm.