JPS64161B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an internal diameter collect chuck device.

[Conventional technology]

Conventionally, the one shown in Fig. 4 is generally known as this type of collect chuck device, and this structure is as follows:
A mounting member 52 is attached to the main shaft 51 of the machine tool, a collet member 54 is attached to the front surface of the mounting member 52 with a tightening nut 53, and a thrust member 55 is attached to the inner peripheral surface of the collet member 54. A male tapered surface 56 is fitted through the thrust member 55 so as to be slidable forward and backward in the axial direction thereof, and is tapered toward the front end of the thrust member 55.
A female tapered surface 57 that fits into the male tapered surface 56 is formed on the inner circumferential surface of the collect member 54, and the workpiece W is inserted into the outer circumferential surface of the collect member 54 so that the thrust member 55 moves forward. The collet member 54 is expanded by sliding and the workpiece W is tightened on the outside.

However, since this structure has a cantilevered structure in which the thrust member 55 protrudes from the so-called bearing portion 58, there is a risk that the machining accuracy of the workpiece W may be reduced due to cutting force, centrifugal force, etc. applied to the workpiece W.

In order to suppress the vibration due to the cantilevered structure of the thrust member 55, a fifth
The structure shown in the figure is known.

That is, attaching the mounting member 62 to the main shaft 61,
A thrust member 63 is provided that penetrates the main shaft 61 and is moved forward and backward in the axial direction of the main shaft 61 by a cylinder mechanism (not shown) of the machine tool, and a support shaft member 64 is provided at the center of the front surface of the mounting member 62, with the support shaft member 64 centered on the main shaft 61. A tapered male tapered surface 65 is formed on the outer peripheral surface of the support shaft member 64, and a female tapered surface 66 is formed on the outer peripheral surface of the support shaft member 64 to fit with the male tapered surface 65 on the inner peripheral surface. The thrust member 67 is slidably fitted into the support shaft member 64, and the thrust member 67 is
3 and engages the tip thereof with a collet member 67, and a work contacting surface 68 is formed on the front surface of the mounting member 62.

When the thrust member 63 is pulled, the collet member 67 is pulled toward the main shaft 61 on the support shaft member 64, and the collet member 67 expands due to the taper action of the male taper surface 65 and the female taper surface 66, and moves into the workpiece W. The surrounding surface will be compressed.

[Problem to be solved by the invention]

However, in this conventional structure, since the collet member 67 slides in the axial direction when the workpiece is clamped, an axial force is applied to the workpiece, and a pressing force is applied to the contact position P between the workpiece W and the workpiece contact surface 68. When the workpiece is thin, the workpiece W
This has the disadvantage that deformation may occur.

[Means to solve the problem]

The purpose of the present invention is to solve these inconveniences, and the gist thereof will be explained with reference to the attached drawings of FIGS. 1 to 3.
a mounting member 3 attached to; passing through the main shaft 2;
a thrust member 5 that is moved forward and backward in the axial direction of the main shaft 2 by the cylinder mechanism 4 of the machine tool 1; a support shaft member that is formed protruding from the center of the front surface of the mounting member 3 and is concentric with the center of the main shaft 2; 6; a sliding member 8 which is slidably attached to the outer circumferential surface of the support shaft member 6 and has a male tapered surface 7 tapered forward toward the outer circumferential surface; a collet member 10 that is protrudingly attached, has a female tapered surface 9 on its inner circumferential surface that fits with the male tapered surface 7, and is capable of penetrating and outwardly tightening the workpiece W on its outer circumferential surface; the thrust member 5 and the sliding member; Thrust transmission member 1 connecting with moving member 8
1 and;

〔Example〕

The machine tool 1 of this embodiment is a lathe, and the reference numeral 12
13 is a directional control valve, and 14 is a hydraulic tank unit.

Further, the cylinder mechanism 4 has both a mechanism for moving the thrust member 5 forward and backward and a mechanism for allowing the main shaft 2 to open.

Further, the mounting member 3 of this embodiment is attached to the main shaft 2 with bolts 15.

Further, the support shaft member 6 is integrally formed to protrude from the central portion of the front surface of the mounting member 3.

Further, the sliding member 5 of this embodiment is configured to be slidable in the axial direction by means of a sliding bearing 16.

Further, the collet member 10 of this embodiment has a plurality of cut grooves 17 on the outer circumference, and the cut grooves 17
Although the width is normally about 1 mm, it is formed to a narrow width of about 0.3 mm.

This is because the workpiece W is a thin member.
This is to prevent the inner circumferential surface of the workpiece W from sinking into the cut groove 17 due to the cutting force, thereby preventing the inner circumferential surface from being damaged or bent into a wave-like shape.

Further, the thrust transmission member 11 of this embodiment includes an intermediate bolt 18, a set screw 19, a tightening nut 20,
Consisting of a mounting bolt 21, a sliding rod 22, a bolt 23, and a connecting bolt 24, an intermediate bolt 18 is connected to the thrust member 8, a tightening nut 20 is connected to the intermediate bolt 18 with a set screw 19, and the mounting member A sliding rod 22 is fitted into the sliding rod 3 so as to be slidable in the axial direction, a mounting bolt 21 is fitted into the sliding rod 22, a tightening nut 20 is connected to the mounting bolt 21, and the sliding rod is Several connecting bolts 24 are connected to 22 by bolts 23, and these connecting bolts 24 are projected forward through the mounting member 3, and these connecting bolts 24 are connected to each other by bolts 23.
is connected to the sliding member 8.

Further, the collet member 10 has a pressing ring 25.
and is attached to the mounting member 3 with bolts 26.

Further, in this embodiment, a receiving cylinder member 28 is fixed to the center of the front part of the support shaft member 6 with a bolt 27, and the rear end surface of this receiving cylinder member 28 is used as a front stopper part.
The front end surface of the sliding rod 22 is applied to this to regulate the forward position of the sliding member 8, and the mounting member 3
A stopper bolt 29 is screwed onto the front end of the stopper bolt 29, and the front end of the stopper bolt 29 is used as a rear stopper, and the rear surface of the sliding member 8 is applied to this to regulate the forward and backward positions of the sliding member 8.

Further, an engagement plate 30 is formed in the front part of the receiving cylinder member 28, and an annular groove 31 is formed in the front part of the collet member 10, and the annular groove 31 and the engagement plate 30 are formed in the front part of the collector member 10.
A ring plate 32 having spring elasticity is interposed between the collet member 10 and the collet member 10 to facilitate expansion and contraction operations of the collet member 10.

Since this embodiment has the above configuration, when the thrust member 5 is moved forward by the cylinder mechanism 4, the sliding rod 22 moves forward, and the connecting bolt 2 moves forward.
4, the sliding member 8 slides forward on the support shaft member 6 by the action of the sliding bearing 16, and as the sliding member 8 moves forward, the male tapered surface 7 contacts the female part of the collector member 10. The collet member 10 is pressed against the tapered surface 9, and the collet member 10 expands due to this pressing force, thereby tightening the work W to the outside.

When the thrust member 5 is moved forward and backward by the cylinder mechanism 4, the sliding rod 22 moves backward, and the sliding member 8
moves backward on the support shaft member 6 by the action of the sliding bearing 16, and as the sliding member 8 retreats, the pressure contact between the male tapered surface 7 and the female tapered surface 9 is released. The collector member 10
is restored and reduced, and the workpiece W is released and removed.

〔Effect of the invention〕

Since the present invention is configured as described above, when the thrust member 5 is moved forward and backward by the cylinder mechanism 4,
The sliding member 8 moves forward and backward as the sliding member 8 moves forward and backward, and during this forward movement, the male tapered surface 7 of the sliding member 8 and the female tapered surface 9 of the collet member 10 are pressed against each other, and this pressing action causes the collet member to 10 expands,
Therefore, the workpiece W can be clamped to the outside, and when retracting, the pressure contact between the male tapered surface 7 and the female tapered surface 9 is released, the collet member 10 is restored and contracted, and the workpiece W is released. can do.

At this time, in particular, the sliding member 8 slides on a support shaft member 6 formed protruding from the center of the front surface of the mounting member 3 concentrically with the center of the main shaft 2, and by this sliding, the collector Since the member 10 is expanded, the rigidity of the support shaft member 6 serves to improve the sliding accuracy of the sliding member 7, and therefore the collet member 1
0 expands with accuracy, especially with high concentricity, and therefore it can be expected that the accuracy of tightening and holding the workpiece W will improve.

Moreover, since the collet member 10 has a structure in which it only expands and contracts in the radial direction without sliding in the axial direction, it does not apply any force in the axial direction to the workpiece W, and the deformation of the workpiece W can be suppressed to that extent, resulting in a good workpiece. It becomes possible to retain the data.

In addition, by making the sliding movement occur using the sliding bearing 16, the sliding accuracy is further improved, and the accuracy of holding the workpiece W in the fastened state can be further improved.

As described above, the intended purpose can be fully achieved.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a vertical cross-sectional view of the main part, FIG. 2 is a cross-sectional view thereof, and FIG.
The figure is an overall front view, FIG. 4 is a vertical cross-sectional view of a conventional example, and FIG. 5 is a vertical cross-sectional view of another conventional example. W...Work, 1...Machine tool, 2...Spindle,
3... Mounting member, 4... Cylinder mechanism, 5... Thrust member, 6... Support shaft member, 7... Male tapered surface,
8...Sliding member, 9...Female tapered surface, 10...Collection member, 11...Thrust transmission member.

Claims (1)

[Scope of Claims] 1. A mounting member attached to a main shaft of a machine tool; a thrust member that passes through the main shaft and is moved forward and backward in the axial direction of the main shaft by a cylinder mechanism of the machine tool; A protrusion is formed at the center of the front of the mounting member,
a support shaft member that is concentric with the center of the main shaft; a sliding member that is slidably attached to the outer peripheral surface of the support shaft member and has a male tapered surface that tapers forward toward the outer peripheral surface; It is attached protrudingly to the front outer periphery,
a collet member having a female tapered surface that fits with the male tapered surface on its inner circumferential surface and capable of penetrating and outwardly tightening a workpiece on its outer circumferential surface; a thrust transmission member that connects the thrust member and the sliding member; A collect chuck device comprising; 2. The collect chuck device according to claim 1, wherein the outer circumferential surface of the supporting member and the outer circumferential surface of the sliding member are slidable by a sliding bearing.