JPH0715215U - Machine tool co-rotation prevention device - Google Patents

Abstract

(57) [Summary] [Purpose] To facilitate the replacement of cutters in a short time. In a machine tool in which a cutter 3 is detachably attached to a cutter adapter 2 attached to a spindle 1 via a mounting bolt 4, when the attachment bolt 4 is attached or loosened in order to replace the cutter 3, Cutter 3
The spindle 1 by fixing the
Since the spindle 1 does not rotate together when the cutter 3 is replaced, the cutter 3 can be replaced easily and in a short time.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a co-rotation preventing device for a machine tool, which facilitates replacement of a cutter.

[0002]

[Prior art]

 Conventionally, a machine tool such as a crankshaft mirror for cutting a crankshaft uses an inner blade cutter a as shown in FIG. 1, and this inner blade cutter a is connected to a spindle (see FIG. (Not shown). The inner cutter a is fixed to the cutter adapter b by tightening a half-moon shaped key c with a bolt d or directly tightening a bolt e.

[0003]

[Problems to be solved by the device]

 For this reason, when replacing the inner blade cutter a, if the bolts d and e are loosened or tightened with a tool, the spindle to which the cutter adapter b is attached will rotate together to loosen or tighten the bolts d and e. It took a lot of time and it was not easy to replace the cutter. The present invention has been made in order to improve such a problem, and an object thereof is to provide a co-rotation preventing device for a machine tool that facilitates replacement of a cutter.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is a machine tool in which a cutter is detachably attached to a cutter adapter attached to a spindle through a mounting bolt, when tightening or loosening the mounting bolt to replace the cutter. The co-rotation of the spindle is prevented by fixing the above-mentioned cutter by a rotation stopping means.

[0005]

[Work]

 With the above configuration, since the spindle does not rotate together when the mounting bolt is rotated, the cutter can be easily replaced in a short time.

[0006]

【Example】

 An embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS. In FIG. 3, 1 is a spindle of a machine tool, and a cutter 3 is detachably attached to the tip of the spindle 1 via a cutter adapter 2. The cutter 3 has a ring shape, and a plurality of chips 3a are mounted on the inner peripheral surface at equal intervals in the circumferential direction, and the outer peripheral side is mounted on the cutter adapter 2 by a plurality of mounting bolts 4. ing.

2 and 3 show a work rest device, in which a pair of rest arms 5b are provided on a base plate 5a of the work rest device 5 so as to be vertically openable and closable. A semicircular notch 5c for supporting a work (not shown) from above and below is formed on the facing surface of the arm 5b. The board 5a is provided with a clamper 5d for holding each of the rest arms 5b in a closed state by clamping the open end of the closed rest arm 5b, and a pin hole 5e is formed above the board 5a. The spindle 1 can be prevented from rotating together by inserting the detent pin 6 inserted through the pin hole 5e into the pin hole 2a formed in the cutter adapter 2.

To explain the operation, when replacing the cutter 3, first, the pin 5e of the board 5a and the pin 2a of the cutter adapter 2 are aligned with each other with the rest arm 5b of the work rest device 5 opened. Then, the detent pin 6 inserted from the pin hole 5e on the substrate 5a side is inserted into the pin hole 2a of the cutter adapter 2 to detent the cutter adapter 2. Then, by loosening the mounting bolt 4 with a tool in this state, the spindle 1 does not rotate together, so that the cutter 3 can be easily replaced.

4 and 5 show another embodiment in which the chuck 8 is used to prevent co-rotation, which will be described below. In FIGS. 4 and 5, reference numeral 10 denotes a cutter exchange jig used when the cutter 3 is attached and detached. A tongue-shaped detent piece 10a is provided on the inner peripheral portion of the cutter exchange jig 10 and a chuck 8 side is provided. Forms a notch 8a into which the detent piece 10 fits.

When exchanging the cutter 3, the cutter 3 is moved to the outer peripheral side of the chuck 8 and the detent piece 10 a of the cutter exchanging jig 10 is fitted into the notch 8 a of the chuck 8 at this position. Attach the cutter replacement jig 10 to the cutter 3. Next, in this state, the cutter 3 can be easily replaced by loosening the mounting bolt 4 for mounting the cutter 3 with a tool.

[0011]

[Effect of device]

 As described in detail above, this invention uses the work rest device and the cutter replacement jig to prevent the cutter from rotating, and in this state, the mounting bolts that attach the cutter are loosened and tightened. Spindle does not rotate together. As a result, the cutter can be easily replaced in a short time, and the existing work rest and cutter replacement jig can be used, which can be easily and inexpensively performed.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a cutter attached state of a conventional machine tool.

FIG. 2 is a front view showing a co-rotation preventing device for a machine tool according to an embodiment of the present invention.

3 is a sectional view taken along the line AA of FIG.

FIG. 4 is a front view showing a co-rotation preventing device for a machine tool according to another embodiment of the present invention.

5 is a cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

1 ... Spindle, 2 ... Cutter adapter, 2a ... Pin hole,
3 ... Cutter, 4 ... Mounting bolt, 5 ... Work rest device, 5e ... Pin hole, 8 ... Chuck, 8a ... Notch, 10 ...
Cutter replacement jig, 10a ... Detent piece.

Claims (3)

[Scope of utility model registration request] 1. A machine tool in which a cutter 3 is detachably attached to a cutter adapter 2 attached to a spindle 1 via an attachment bolt 4, when the attachment bolt is tightened or loosened in order to replace the cutter 3. A co-rotation preventing device for a machine tool, which prevents co-rotation of the spindle 1 by fixing the cutter 3 with a rotation-stopping means. 2. Pin holes 5e, 2a in which a detent means for the cutter 3 is formed in the work rest device 5 and the cutter holder 2.
2. The co-rotation preventing device according to claim 1, wherein the anti-rotation device is constituted by a detent pin 6 which is removably inserted into the pin holes 5e and 2a. 3. A rotation stopping means for the cutter 3 comprises a rotation preventing piece 10a protruding from an inner peripheral portion of the cutter exchanging jig 10, and a notch 8a formed in the chuck 8 so that the rotation preventing piece 10a fits. The co-rotation preventing device according to claim 1, wherein