JPS6094209A - Work retaining device using collet chuck - Google Patents

Abstract

PURPOSE:To prevent chips or the like from advancing into a collet portion by coupling collet portions to each other with thin cylindrical portions, clamping both inner and outer surfaces of the collet portions with protective sleeves, and holding end surface seal materials contacting the thin cylindrical portions on the protective sleeves. CONSTITUTION:A plurality of collet portions 3 formed on a collet chuck 2 concentrically and axially projected to the front of the chuck body 1 are coupled to each other by thin cylindrical portions 10 having flexibility. Both inner and outer surfaces perpendicular to the expanding and contracting direction of the collet portions 3 are provided with protective sleeves 11a, 11b disposed in such a manner as to clamp both surfaces, and end surface seal materials 12 contacting the thin cylindrical portions 10 are held at the protective sleeves 11a, 11b. When an operation sleeve 4 is moved to the right by an operation lever 8, the collet portions 3 are reduced by taper fitting 14 to clamp a work W. At this time, chips or the like is prevented from advancing between slits of the collet portions 3 by the thin cylindrical portions 10 and protective sleeves 11a, 11b.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a workpiece holding device using a collet chuck used in a machine tool.

<Prior art> When a workpiece is held by a resoto chuck, chips enter through the slits in the collet part that expands and contracts in the radial direction.
Obstructs the workpiece holding function. In order to prevent the intrusion of chips, as disclosed in Japanese Utility Model Publication No. 46-1485, the slits are closed with shielding plates, or elastic rubber or the like is inserted between the slits. In other words, since the collet portion must allow expansion and contraction in the radial direction, it is intended to prevent chips from entering only from between the slits.

Chips and coolant can enter not only between the slits but also from the taber fitting surface on the outer periphery of the collet, but conventionally, there is almost no sealing performance to prevent chips and coolant from entering the taber fitting surface. It was in a terrible state.

<Object of the Invention> An object of the present invention is to reliably prevent chips, coolant, etc. from entering not only the slit of the collet portion but also the Taber fitting surface.

<Structure of the Invention> The structure of the present invention is such that a plurality of collet parts formed in a collet chuck are interconnected by a thin cylindrical part having flexibility, and the inner and outer surfaces of each collet part are sandwiched in a direction orthogonal to the expansion/contraction direction. A protective sleeve is disposed on the sleeve 5, and an end face sealing material that contacts the thin cylindrical portion is held in the protective sleeve.

<Examples> Examples of the present invention will be described below with reference to the accompanying drawings. 1st
In the figure, 1 is the chuck body. A collet chuck 2 concentrically protruding in the axial direction is fixed to the front surface of the chuck body 1. Reference numeral 3 denotes a plurality of collet parts formed in the collet chuck 2, which expand and contract in the radial direction orthogonal to the axis to clamp and unclamp the workpiece WY. 4 is the outer periphery of the collet part 3 that is fitted with a taber (14), and moved forward and backward in the axial direction.
fll 3 w expanding/contracting f eccentric slinib. This operating sleeve 4 is held movably back and forth via a stroke bearing 6 interposed in the gap between the fixed sleeve 5, which is fixed to the chuck body 1 with a gap around its outer periphery, and As shown in FIG. 2, a fork-shaped operating lever 8 is connected to the clamp cylinder 7 fixed to the chuck body 1 and swings using the fulcrum portion 91 as a fulcrum.
It is operated by.

Therefore, the plurality of collet parts 3 are connected to each other by a thin cylindrical part 10 having flexibility.

Furthermore, protective sleeves 11α and 11h are attached to both the inner and outer surfaces of the collet portion 3 perpendicular to the direction of expansion and contraction.
The protective sleeves 11α and 1ψ hold an end face sealing material 12 in contact with the thin cylindrical portion 10. 13 is a positioning pin for the workpiece W that protrudes from the outer protective sleeve 11 (Z).

Since the present invention has the above-described configuration, the collet portion 3 of the collet chuck 2 is expanded and unclamped by the backward movement of the actuation sleeve 4 (leftward movement in FIG. 1) by the actuation of the actuation lever 8. By forward movement (movement to the right in FIG. 1), the collet portion 3 is contracted by the taper fitting 14 and clamps the workpiece WY. Then, the thin cylindrical portion 10 is allowed to expand and contract in the radial direction of the collet portion 3.
In addition, the holding sleeve 1112 and IIA prevent cholera (cutting chips,
This prevents coolant etc. from entering.

Effects> As described above, the present invention connects the collet parts to each other by the thin-walled cylindrical part, and seals the collet parts with the protective sleeve arranged so as to sandwich both the inner and outer surfaces of the collet part, and the thin-walled cylindrical part held by the protective sleeve. The end face sealing material seals the inner and outer periphery of the collet part including the fitting part, so it is possible to reliably prevent the intrusion of chips, coolant, etc. while the collet part has the expansion and contraction function, and it is possible to prevent machining. Object 2 has the effect of always holding the object with high precision.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the device of the present invention, and Fig. 2 is Fig. 11-■
3 is a sectional view taken along the line T' in FIG. 1. 1... Chuck body, 2... Collet chuck, 3
... Collet part, 4... Operating sleeve, 10...
Thin cylindrical portion, 11α, llb...protective sleeve, 12
9 One end sealing material.

Claims (1)

[Claims] A plurality of collet parts formed in the collet chuck are interconnected by a thin, flexible cylindrical part, and protective sleeves are arranged to sandwich the inner and outer surfaces of the collet part perpendicular to the direction of expansion and contraction. A workpiece holding device using a collet chuck, in which a sleeve holds a sealing material on the 1" end face in contact with the thin-walled cylindrical portion.