JPH0753841Y2 - Lathe centering holder - Google Patents

Description

[Detailed description of the device]

[0001]

2. Description of the Related Art When cutting a long object such as a roll with a lathe,
One end is fixed by a chuck and rotated, while the other end presses the pointed tip portion 41 of the center holding portion 4 into a conical recess formed in the center portion on the tip side of the workpiece 6 to hold the center. ing.

[0002]

However, in the above long object, the other end (tip side) holds only the center position at the tip portion 41 and there is no axial pressing, so the object to be cut is pushed by the cutting tool 7. 6 may be slightly curved and the required cutting accuracy may not be obtained.

In a thin film rolling roll or the like, this slight error in cutting accuracy may affect the quality of the film, resulting in a defective product. For example, the total length is 1200 mm
In the case of a long roll, the outer diameter finish is so-called chattering, and therefore, the cutting process is divided into three times. However, since the machining accuracy is low and the balance is lost due to slight chattering, there is a problem that the rotation speed of the lathe cannot be increased and a long processing time is required.

An object of the present invention is to solve the above problems and to provide a centering holder for a lathe which has a high machining accuracy and can facilitate machining in a short time.

[0005]

In order to solve the above-mentioned problems, an annular fixing portion 1 fitted to a center holding portion 4 of a lathe, and an end portion of a workpiece 6 opposite to a chuck 5 of the lathe. There is provided a centering holder for a lathe, which is composed of a holding portion 2 for holding the holding portion 2 and a plurality of arms 3 for connecting the holding portion 2 and the fixed portion 1.

An arm 3 is fixed to the fixed portion 1 in a direction parallel to an annular center line, and a center holding portion 4 of a lathe.
And a plurality of setscrews 11 which are fixed to the center holding part 4 after being fitted to the center holding part 4.
1 is provided.

This holding mechanism 21 is movable in the radial direction on a plane perpendicular to the annular center line of the fixed portion 1 and has a roller 212 capable of pressing the workpiece 6 at the tip thereof.
1 is provided, and the slider 211 is configured to be able to hold the workpiece 6 at the center position of rotation with the adjusting screw 213 and the fixing screw 214, and the arm 3 is adapted to the length of the workpiece 6. And a connecting portion 31 that can be exchanged with the fixed portion 1 having arms 3 having different lengths.

[0008]

As described above, when the work piece 6 is rotated and cut by the cutting tool 7, the work piece 6 is pushed to the opposite side of the cutting tool 7 with a strong force. However, not only the center position of the end portion on the opposite side of the chuck 5 is held by the tip 41 of the center holding portion 4 of the lathe, but also the center position is held at the position closer to the chuck 5 from the above-mentioned end portion. Therefore, there is almost no curvature of the workpiece 6,
High precision cutting is possible.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of a centering holder of a lathe according to the present invention, (a) is a side view seen from the chuck side of the lathe,
(B) is a side view seen from the direction perpendicular to the rotation axis of the lathe.
FIG. 6 is an explanatory view showing a state where the centering holder is mounted on a lathe.

This centering holder has an annular fixing portion 1 which fits in a center holding portion 4 of a lathe, a holding portion 2 which holds the workpiece 6 on the side opposite to the chuck 5 of the lathe, in the vicinity of the end portion. It is composed of a plurality (two in this embodiment) of arms 3 connecting the holding portion 2 and the fixed portion 1.

An arm 3 is fixed to the fixed portion 1 in a direction parallel to the rotary shaft of the lathe, that is, an annular center line, and is fitted to the center holding portion 4 of the lathe and then fixed to the center holding portion 4. And a plurality of setscrews 11 that operate.

The holding portion 2 has a substantially semicircular arc shape, and a holding mechanism 21 for holding the work 6 is provided at both ends and the central portion of the arc shape. This holding mechanism 21 is provided with a slider 211 which is movable in a radial direction on a plane perpendicular to the center line of the annular fixing portion 1 and has a roller 212 at its tip which can press the workpiece 6. The slider 211 is constructed so that the workpiece 6 can be held at the center of rotation by the adjusting screw 213 and the fixing screw 214.

The arm 3 is provided with a fixing portion 1 having an arm 3 having a different length depending on the length of the work 6 and a replaceable connecting portion 31, and for one type of holding portion 2. Several types of fixing parts 1 having different lengths of the arm 3 are prepared.

[0014]

As described above, the workpiece 6 is chucked by the chuck 5
Not only holds the center position of the end on the opposite side by the center holding part 4 of the lathe, but also moves the position from the end to the chuck side by 3
Since the center is held from the direction, there is almost no bending or chattering of the workpiece 6. High precision cutting is possible.

As a result, the number of revolutions of the lathe can be increased and the cutting depth can be increased.
It is possible to cut once as a result of machining that was divided into several positions, and it is possible to reduce the processing time as a whole.

Since bending, bending and chattering can be suppressed,
It is also possible to process long products.

[Brief description of drawings]

FIG. 1 is a block diagram of a centering holder of a lathe according to the present invention,
(A) is a side view seen from the chuck side of the lathe, and (B) is a side view seen from a direction perpendicular to the rotation axis of the lathe.

FIG. 2 is an explanatory view showing a state in which the object to be cut is attached to a lathe in which the centering holder is attached to the lathe.

FIG. 3 is an explanatory view showing a state in which an object to be cut is attached to a conventional lathe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed part 2 Holding part 21 Holding mechanism 211 Slider 212 Roller 213 Adjustment screw 214 Fixing screw 3 Arm 31 Connection part 4 Center holding part 5 Chuck 6 Workpiece

Claims (1)

[Scope of utility model registration request] 1. A ring-shaped fixing portion that fits into a center holding portion of a lathe, a holding portion that holds an end of an object to be cut opposite to a chuck of the lathe, and the holding portion and the fixing portion are connected to each other. A plurality of arms that are fixed to the fixing portion in a direction parallel to the annular center line and that are fitted to the center holding portion of the lathe and then fixed to the center holding portion. Set screw, the holding portion is an arc shape of a substantially semi-circular shape, and a holding mechanism for the workpiece is provided at both ends and a central portion of the arc shape, and the holding mechanism is perpendicular to the rotary shaft of the lathe. There is a slider with a roller that can move in a radial direction on a flat surface and that can press the work piece at the tip, and this slide piece is the center of rotation of the work piece with the adjusting screw and the fixing screw. It is configured to be held in position, and the arm is the length of the work piece. A centering holder for a lathe, comprising a connecting portion that can be replaced with the fixing portion having arms having different lengths according to the above.