JP3029248U - Holding device for cutting tools in lathes - Google Patents

Abstract

(57) [Abstract] [Problem] Centering at the time of initial setting of a cutting tool and displacement correction due to a collision accident can be easily performed by a simple structure improvement without adding a large improvement to a conventional tool holder or the like. Therefore, it is necessary to improve work efficiency. A tool holder (2) is provided on a turret head (1), a sleeve (3) is inserted and attached to the tool holder (2), a cutting tool (4) is rotatably inserted into the sleeve (3), and a cutting tool (4) is attached by a bolt (6). Holding device for a cutting tool in a lathe for fixing a tool to the tool holder 2 via the sleeve 3. The shaft core P1 of the insertion hole 3a of the cutting tool 4 of the sleeve 3 is formed to have an eccentric wall thickness so as to be eccentric with respect to the shaft center P2 of the sleeve 3, and the stupid hole 5 is formed around the sleeve 3. A fixing means 7 is provided which is a long hole which is long in the direction and which fixes the relative rotational position of the sleeve 3 with respect to the tool holder 2.

Description

[Detailed description of the device]

[0001]

[Field of Invention]

 The present invention relates to a holding device for a cutting tool in a lathe, particularly a lathe used in an NC lathe, and as a tooling system, particularly a cutting tool in a lathe that holds a cutting tool such as a boring holder or a drill holder via a sleeve. Holding device.

[0002]

[Prior art]

 In a lathe, especially an NC lathe, for example, an octagonal turret head is used, and a large number of cutting tools are attached so as to project in the circumferential direction, and the required cutting tool is selected and used by the rotation of the turret head. Has been made possible. Among these cutting tools, cutting tools for boring and drilling are attached through a sleeve inserted into a tool holder.

[0003]

[Problems to be solved by the device]

 By the way, in a cutting operation, a workpiece, a jig, etc. often collide with a cutting tool such as a drill protruding from a tool holder due to an erroneous operation. When such a situation occurs, the impact is transmitted to the turret head, causing the fixed key of the turret head to be slid or sometimes deformed, resulting in the initially set axis of the cutting tool such as a drill being misaligned. It will be. Especially in the case of a drill, there is a danger that the drill will break and fly if the core goes wrong.

If the radial deviation of the turret head occurs when the axis of the cutting tool is misaligned, it can be easily corrected by adjusting the horizontal movement position of the turret head. It is not possible to adjust the position of the turret head that is configured to stop at a predetermined rotation angle position so that various cutting tools can be selected when there is a displacement in the moving direction. Therefore, when the circumferential displacement of the turret head occurred, it was necessary to remove the turret head and reassemble it to center the cutting tool.

In order to deal with such a deviation in the axis of the cutting tool, it is often necessary to dispatch not only the operator of the lathe but also a professional engineer to remove and adjust the turret head. As a matter of course, the production stoppage requires a lot of time and labor for recovery.

In view of these problems of the prior art, the present invention can easily perform centering at the time of initial setting of a cutting tool and displacement correction due to a collision accident without adding a large improvement to a conventional tool holder or the like. The purpose of this is to improve work efficiency by making it possible to easily carry out such structural improvement.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a holding device for a cutting tool in a lathe according to the present invention is provided with a tool holder 2 on a turret head 1, a sleeve 3 is inserted into the tool holder 2 and mounted, and a sleeve 3 is attached to the sleeve 3. A cutting tool 4 having a columnar base portion is rotatably inserted, and the cutting tool 4 is fixed to the tool holder 2 via the sleeve 3 by a bolt 6 that passes through a fool hole 5 formed in the peripheral wall of the sleeve 3. In the holding device for a cutting tool in a lathe configured as described above, an eccentric wall is formed so that the axis P1 of the insertion hole 3a of the cutting tool 4 of the sleeve 3 is eccentric with respect to the axis P2 of the sleeve 3. The thickness of the back hole 5 is long in the circumferential direction of the sleeve 3, and the relative rotation position of the sleeve 3 with respect to the tool holder 2 is fixed. Is provided with constant means 7 is of took measures that.

In the present invention, the fixing means 7 is configured such that the insertion tip of the sleeve 3 projects from the tool holder 2 and is provided with a screw portion 7a, and the screw portion 7a has the above-mentioned tool holder. It is preferable that a nut 7b for pressing 2 is screwed together.

In the present invention, the fixing means 7 includes a bolt hole 7c bored in the tool holder 2 and a bolt 7d inserted into the bolt hole 7c to press the outer peripheral portion of the sleeve 3. It is preferable that

In addition, in the present invention, it is preferable to provide a centering member 8 having a cylindrical shape, which is inserted into the sleeve 3 instead of the cutting tool 4.

[0011]

[Embodiment of device]

 According to the device of the present invention, for example, when the cutting tool 4 (here, a drill) collides with another object during cutting operation and the center of the cutting tool 4 deviates, the turret head 1 can be corrected normally in the horizontal direction. It can be corrected by controlling the horizontal position in the same way as horizontal movement to the working position. The problematic correction of the turret head 1 in the circumferential direction can be performed in the following manner.

First, the fixing means 7 is released, the sleeve 3 is set in a free state with respect to the tool holder 2, the bolts 6 fixing the drill 4 are loosened, and the crimping of the drill 4 to the sleeve 3 is released. The drill 4 is once removed and the centering member 8 is replaced. In this case, the drill 4 may be used as it is without being pulled out, but here, the case where the centering member 8 is used will be described.

Then, the sleeve 3 having an eccentric wall thickness is rotated with respect to the tool holder 2. As a result, the axis P1 of the insertion hole 3a of the drill 4 of the sleeve 3 is eccentric with respect to the axis P2 of the sleeve 3 (that is, the axis of the hole of the tool holder 2). To be

For example, as shown in FIG. 3, the state of the initial mounting state in which the displacements of the axis P1 of the insertion hole 3a of the drill 4 and the axis 2 of the sleeve 3 are matched in the horizontal axis Y direction. Therefore, when the sleeve 3 is rotated 90 degrees to the right (clockwise) as shown in FIG. 4, the displacement X1 in the circumferential direction (upward) with respect to the horizontal axis Y (the maximum displacement is shown). , The displacement amount obtained in the turning range of about 45 degrees is actually used).

As a matter of course, this displacement is accompanied by a displacement X1 in the circumferential direction of the turret head 1 and a displacement Y1 (increase in diameter) in the horizontal direction. Therefore, the horizontal displacement Y1 can be adjusted by the horizontal movement of the turret head 1, and any method or combination can be appropriately used. In this way, if the displacement of the drill 4 due to the above-mentioned collision or the like is deviated downward with respect to the horizontal position, this correction method can eliminate it.

Further, if the displacement of the drill 4 due to the above-mentioned collision or the like is displaced upward with respect to the horizontal position, the sleeve 3 is moved to the left (counterclockwise) from the position of the initial mounting state. When it is turned 90 degrees, the displacement X2 (maximum displacement) in the circumferential direction (downward) with respect to the horizontal axis Y is obtained, and the deviation can be easily corrected. Of course, this displacement is accompanied by the displacement X2 in the circumferential direction of the turret head 1 and the displacement Y2 (increase in diameter) in the horizontal direction. Therefore, similarly to the above, since the horizontal displacement Y1 can be adjusted by the horizontal movement of the turret head 1, any method or combination can be appropriately used.

The centering for the above-mentioned correction is performed by bringing a dial gauge (normally magnetic attraction) attached to the rotating body of the main shaft at the opposite position into contact with the peripheral surface of the centering member 8 to rotate the eccentricity. Do it while checking the degree. At this time, if the main body has a cylindrical shape like the drill 4, the dial gauge can be easily actuated by utilizing that portion. Needless to say, the centering member 8 can be conveniently used not only for the correction work due to the above troubles but also for the centering at the time of initial setting of the various cutting tools 4.

[0018]

【Example】

 A preferred embodiment of a holding device for a cutting tool in a lathe according to the present invention will be described in detail below with reference to the drawings. Here, an NC lathe which is widely used today as a lathe will be described as an example. FIG. 1 is a front view of the entire NC lathe. FIG. 2 is a front view of the octagonal turret head 1, in which various tool holders for mounting various cutting tools are provided, and there are a milling machine, an outer diameter holder, an inner diameter holder, etc., and a drill. Tool holders using sleeves for boring, etc. are provided.

That is, when the sleeve is provided as a reference, the turret head 1 is configured to horizontally move between the standby position and the working position and select the required cutting tool 4 by rotation. 2 is provided, the sleeve 3 is inserted into the tool holder 2 and mounted, the cutting tool 4 having a cylindrical base portion is rotatably inserted into the sleeve 3, and a fool hole 5 formed in the peripheral wall of the sleeve 3 It can be said that the cutting tool 4 is configured to be fixed to the tool holder 2 via the sleeve 3 by a bolt 6 (see FIG. 7) passed through.

Then, as shown in FIGS. 3 and 4, the eccentric wall thickness is set so that the axis P1 of the insertion hole 3a of the cutting tool 4 of the sleeve 3 is eccentric with respect to the axis P2 of the sleeve 3. Is configured. The eccentric wall thickness is 3 mm at maximum (between the axis P1 and the axis P2) in this embodiment, and therefore, the eccentric amount of 1.5 mm by 90 degrees of rotation, 45 degrees (used in this embodiment The structure is such that 0.75 mm is obtained in one rotation direction). However, it goes without saying that an appropriate range may be set for this amount of eccentricity.

Further, as shown in FIG. 5, the fool holes 5 (here, three holes) are formed as long holes that are long in the circumferential direction of the sleeve 3. This stupid hole 5 has a rotation range of 90 degrees from the axis P2 (45 degrees clockwise from the horizontal position and 45 degrees counterclockwise from the horizontal position) so as not to interfere with the bolt 6. The length is set to allow

FIG. 6 shows a fixing means 7 provided for fixing the relative rotational position of the sleeve 3 with respect to the tool holder 2. In this embodiment, the insertion end of the sleeve 3 is configured to project from the tool holder 2 and a screw portion 7a is provided, and a nut 7b for pressing the tool holder 2 is screwed into the screw portion 7a. Is configured.

However, for example, as shown in FIG. 7, the tool holder 2 includes a bolt hole 7c and a bolt 7d that is inserted into the bolt hole 7c and presses the outer peripheral portion of the sleeve 3. May be.

Reference numeral 8 denotes a centering member, which is inserted into the sleeve 3 instead of the cutting tool 4 when adjusting the eccentricity, and is attached to the rotating body of the spindle on the opposite side so as to facilitate the centering. It is long and cylindrical so that it can contact the dial gauge to be attached.

[0025]

[Effect of device]

 According to the present invention, the tool holder sleeve can be rotated without the need for disassembling the turret head or the like, which cannot be easily repaired due to the collision of other objects with the cutting tool, especially the circumferential displacement of the turret head. By just moving it, it will be possible to correct it extremely easily, and it will be possible for operators in the field to perform repairs without labor and improve work efficiency without waiting for the hands of specialists. Has a remarkable effect. Furthermore, there is an advantage that it does not cost because it can be carried out only by partially improving the structure of the tool holder and the sleeve.

[Brief description of drawings]

FIG. 1 is an overall front view of a lathe to which a cutting tool holding device in a lathe according to the present invention is applied.

FIG. 2 is a front view of a turret head of a cutting tool holding device in a lathe according to the present invention.

FIG. 3 is a side view of the sleeve showing one operation state of the cutting tool holding device in the lathe according to the present invention.

FIG. 4 is a side view of the sleeve showing one operating state of the cutting tool holding device in the lathe according to the present invention.

FIG. 5 is a perspective view of a sleeve of a cutting tool holding device in a lathe according to the present invention.

FIG. 6 is a vertical cross-sectional view of a tool holder of a cutting tool holding device in a lathe according to the present invention.

FIG. 7 is a perspective view of a tool holder showing another embodiment of a cutting tool holding device in a lathe according to the present invention.

[Explanation of symbols]

 1 Turret Head 2 Tool Holder 3 Sleeve 3a Insertion Hole 4 Cutting Tool 5 Facsimile Hole 6 Bolt 7 Fixing Means 7a Screw Part 7b Nut 7c Bolt Hole 7d Bolt 8 Centering Member P1 Insertion Shaft Core P2 Sleeve Shaft Core

Claims (4)

[Scope of utility model registration request] 1. A horizontal movement between a standby position and a work position,
In addition, a tool holder 2 is provided on a turret head 1 configured to select a required cutting tool 4 by rotation, a sleeve 3 is inserted and mounted in the tool holder 2, and a cutting tool 4 having a cylindrical base portion on the sleeve 3 is provided. In a lathe configured to rotatably insert and to fix the cutting tool 4 to the tool holder 2 via the sleeve 3 by means of bolts 6 that pass through stupid holes 5 formed in the peripheral wall of the sleeve 3. In the cutting tool holding device, the axis P1 of the insertion hole 3a of the cutting tool 4 of the sleeve 3
Is formed with an eccentric wall thickness so as to be eccentric with respect to the axis P2 of the sleeve 3, the fool hole 5 is formed as a long hole that is long in the circumferential direction of the sleeve 3, and A holding device for a cutting tool in a lathe, which is provided with fixing means 7 for fixing a relative rotational position with respect to the tool holder 2. 2. The fixing means 7 is provided with a threaded portion 7a configured so that the insertion tip of the sleeve 3 projects from the tool holder 2, and a nut for pressing the tool holder 2 against the threaded portion 7a. A holding device for a cutting tool in a lathe according to claim 1, which is configured by screwing 7b. 3. The tool holder 2 includes the fixing means 7.
The holding device for a cutting tool in a lathe according to claim 1, which is constituted by a bolt hole 7c bored in the hole and a bolt 7d inserted into the bolt hole 7c and pressing the outer peripheral portion of the sleeve 3. 4. A centering member 8 having a cylindrical shape which is inserted into the sleeve 3 in place of the cutting tool 4,
A holding device for a cutting tool in a lathe according to claim 1.