JPH079207A - Cutting tool - Google Patents

Abstract

PURPOSE:To provide a cutting tool by which a work surface is not scratched as well as to eliminate such inconvenience that a cutter holder shaft can not be pulled off from the work after counterboring. CONSTITUTION:A holder shaft 25 to be rotated by an angle of 180 deg. by press-in of coolant liquid of air is provided in the eccentric position of a base body 21 to be turned together with a spindle 22, and the holder shaft penetrates through a hole of a work by moving a cutter 27 into the center area of the base body by the turning movement by an angle of 180 deg. of the holder shaft, and then, the press-in of coolant liquid or air is stopped to rotate the holder shaft by an angle of 180 deg., and the holder shaft is countersunk by the cutter moved in the circumferential direction of the base body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool for spot facing.

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventional counterbore cutting tool descends while rotating a base body 3 together with a shank 2 mounted on a spindle 1, and a holder shaft 4 is inserted into a through hole a of a work A. Penetrate the tip.

Then, when the contact member 5 on the outer peripheral surface of the holder shaft 4 comes into contact with the upper surface of the work A as the descent continues, the holder shaft 4 stops, but only the base body 3 descends, and therefore the workpiece 3 also descends. The blade holder 8 rotates in the protruding direction from the groove 9 of the holder shaft 4 via the pinion 7 that meshes with the rack 6.

Therefore, the edge of the through hole a on the lower surface of the work A is spotted by the blade 10 of the blade holder 8.

Incidentally, when the base body 3 is raised together with the spindle 1 after the spot facing, the blade holder 8 is rotated by the rack 6 which is also raised so as to be retracted into the groove 9.

[0006]

According to the above-mentioned structure, since the cutting powder enters the groove of the holder shaft and becomes clogged with the spot facing, the blade holder cannot be immersed in the groove.

Therefore, there is a problem that the holder shaft cannot be removed from the work.

Further, since the contact member is brought into contact with the surface of the work for processing, the work is scratched and can be processed depending on the shape (taper or unevenness) of the surface of the work, resulting in variations in the size of the spot facing. did.

Therefore, the present invention eliminates the inconvenience that the holder shaft does not come off from the work.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a base body which is connected to a spindle at its distal end side and rotates together with the spindle body, and which is provided on the base body in a distal direction from an eccentric position on the tip surface. A cylindrical body which is connected to the recessed hole and the end of the holder shaft, and which is rotatably supported in the recessed hole, and a blade provided so that the cutting edge projects from the outer peripheral surface of the tip of the holder shaft. A stopper device provided so that the rotation of the holder shaft with respect to the base body is restricted to a range of 180 degrees, and the base body and the holder shaft rotate together; and the cylindrical body of the recessed hole. A slidable piston incorporated in the rear, a spring that gives the piston a restoring force that pushes back in the direction of the tubular body, and a protruding shaft that is continuous from the end of the piston and that is slidably fitted in the tubular body. , This A transmission mechanism provided on the outer circumference of the protruding shaft and the inner circumference of the cylindrical body so as to convert the sliding of the protruding shaft into 180-degree rotation of the cylindrical body, and the base body outside the tip of the base body. A tubular body provided so as to rotate freely, and an engaging portion provided in the tubular body so as to engage with the spindle bearing side when the base body is connected to the spindle;
A locking device that disengages the rotation stoppers provided on the base body and the tubular body when the engagement portion engages with the spindle bearing side, and a piston base body from the engagement portion to the tubular body and the base body. A cutting tool including a passage provided so as to exert a fluid pressure on the tip side surface is adopted.

[0011]

According to the above construction, when the distal end side of the base body is connected to the spindle, the engaging portion engages with the spindle bearing side and the locking device is disengaged so that the base body can freely rotate with respect to the cylindrical body. become.

Next, when coolant or air is supplied to the passage from the spindle bearing side, the projecting shaft slides together with the piston toward the terminal end of the base body while compressing the spring, so that the holder shaft together with the tubular body via the transmission mechanism. It rotates in one direction, and its rotation is restricted to 180 degrees by the stopper device.

While maintaining this state, the tip of the holder shaft is passed through the through hole of the work while lowering the substrate together with the spindle. The holder shaft is penetrated so that the blade reaches the lower side of the work.

When the supply of the coolant liquid or the air is stopped, the compression shaft pushes back the protruding shaft together with the piston. Therefore, the holder shaft rotates in the other direction together with the tubular body through the transmission mechanism, and the stopper device restores 180 times. Regulated every time. Of course, the blade also rotates 180 degrees.

After that, when the base is rotated by driving the spindle and the spindle is gradually raised, the lower edge of the through hole is cut by the blade and the spot is spotted.

After the spot facing, the driving of the spindle is stopped, and then the holder shaft is rotated 180 degrees by supplying the coolant or air as described above, and while maintaining this state, the base body is raised together with the spindle, Remove the holder shaft from the through hole.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, reference numeral 21 is a base body for connecting the distal end side to a spindle 22. The method of connecting to the base body 21 is as follows.
Although 3 is inserted, it may be connected by using a method such as a clamp.

Further, a recessed hole 24 is provided from the eccentric position of the tip end surface of the base body 21 toward the inside, and the recessed hole 24 is formed.
A cylindrical body 26 having an open end connected from the end of the holder shaft 25 is fitted therein, and is supported so as to freely rotate at a fixed position.

A blade 27 is attached to the tip of the holder shaft 25 via a fastener 28 such that the protruding direction of the blade edge is perpendicular to the axis of the holder shaft 25.

Further, the rotation of the holder shaft 25 with respect to the base body 21 is restricted to 180 degrees by the stopper device 29.

In the illustrated case, the stopper device 29 is
A 180 degree arcuate hole 30 provided in the base 21 and a holder shaft 25
The rotor 31 is supported by the rotor 31 and is fitted into the arc-shaped hole 30. By contacting one end of the arc-shaped hole 30 with the rotor 31, the rotation is transmitted from the base 21 to the holder shaft 25.

A piston 33, which is pushed back toward the holder shaft 25 by a spring 32, is incorporated at the rear side of the cylindrical body 26 of the recessed hole 24.

Further, the cylindrical body 2 is attached to the tip surface of the piston 33.
6 is provided with a protruding shaft 34, and a transmission mechanism 35 is provided on the outer periphery of the protruding shaft 34 and the inner periphery of the tubular body 26 to convert the tubular body 26 into 180 ° rotation by sliding the protruding shaft 34.
Is provided.

In the illustrated case, the transmission mechanism 35 is constructed by fitting a twisted elongated hole 36 provided on the inner peripheral surface of the cylindrical body 26 and a rotor 37 axially supported on the outer periphery of the protruding shaft 34 to form a protruding shaft. With the forward and backward movement of 34, the tubular body 26 is rotated in the normal and reverse directions of 180 degrees.

A cylindrical body 38 is provided outside the tip of the base body 21 so that the base body 21 can rotate freely.
8 is provided with an engaging portion 51 that engages (by fitting) with the bearing portion 39 of the spindle 22 when the end of the base body 21 is connected to the spindle 22.

In the illustrated case, the engaging portion 51 is the cylindrical body 3.
A hole 41 whose upper surface is opened is provided in the arm 40 projecting from the outer peripheral surface of 8, and a pipe 42 is fitted into the hole 41, and a spring 43 applies a pushing-back force to the pipe 42 upward. Is connected, the upper end of the pipe 42 is fitted into and engaged with the hole 44 of the bearing 39, and the pipe 42 is pushed down while compressing the spring 43.

Reference numeral 45 denotes the base body 2 associated with the engagement of the engagement portion 51.
This is a locking device that automatically releases the rotation restraint from the pair of cylindrical bodies 38.

The locking device 45 is composed of a pin 46 which moves up and down together with the pipe 42, and a notch 47 which is provided on the outer peripheral surface of the base 21 so that the tip of the pin 26 is disengaged as the pin 46 descends. ing.

Reference numeral 48 denotes a pipe 42, a cylinder 38, and a base 21.
It is a passage that extends inward and applies the supply coolant liquid or air pressure to the front surface of the piston 33 (side surface in the protruding direction of the holder shaft 25).

With the above construction, when the base 21 is connected to the spindle 22, the engaging portion 51 is engaged with the bearing 39 and the locking device 45 is disengaged.

Next, when coolant or air is supplied from the bearing 39 to the passage 48, the protruding shaft 34 is retracted together with the piston 33 while compressing the spring 32. Therefore, together with the tubular body 26 via the transmission mechanism 35. The holder shaft 25 rotates in one direction, and the stopper device 29 rotates 180
Regulated every time. At this time, the blade 2 together with the holder shaft 25
7 also rotates 180 degrees and stops at the position shown by the chain line in FIG.

While maintaining this state, the substrate 21 is lowered together with the spindle 22 so that the holder shaft 25 penetrates the through hole a of the work A.

However, when the supply of the coolant or air is stopped, the compression spring 32 causes the protruding shaft 34 to move forward together with the piston 33, so that the cylindrical body 26 is transmitted through the transmission mechanism 35.
At the same time, the holder shaft 25 rotates 180 degrees, and the blade 27 returns from the chain line position to the solid line position as shown in FIG.

After that, when the spindle 22 is driven and the substrate 21 is raised together with the spindle 22, the counterbore is formed while cutting the lower edge of the through hole a with the blade 27.

After counter boring, the holder shaft 25 is rotated 180 degrees and the holder shaft 25 is pulled out from the through hole a as described above.

[0037]

[Effect] Since the cutting tool of the present invention is configured as described above, there is a problem that the cutting powder cannot be inserted into the groove and the tool cannot be immersed, that is, the holder shaft cannot be removed from the work. To cancel.

Further, it is possible to carry out spot facing processing without damaging the surface of the work.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a cutting tool according to the present invention.

FIG. 2 is a bottom view of a portion that regulates the rotation angle of the holder shaft to 180 degrees.

FIG. 3 is a partially cutaway front view of a conventional cutting tool.

[Explanation of symbols]

 21 Base Body 22 Spindle 23 Shank Part 24 Recessed Hole 25 Holder Shaft 26 Cylindrical Body 27 Blade 28 Clamping Tool 29 Stopper Tool 30 Arc-Shaped Hole 31 Rotor 32 Spring 33 Piston 34 Projection Shaft 35 Transmission Mechanism 36 Screw Long Hole 37 Rotor 38 Cylindrical body 39 Bearing part 40 Arm 41 Hole 42 Pipe 43 Spring 44 Hole 45 Locking device 46 Pin 47 Notch 48 Passage 51 Engagement part

[Procedure amendment]

[Submission date] August 26, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Change

[Correction content]

Further, it is possible to carry out spot facing without damaging the surface of the work and to make the spot facing deep.
It

Claims (1)

[Claims] 1. A base body which is connected to a spindle at an end side thereof and rotates together with the base body, a recessed hole provided in the base body from an eccentric position of a tip end surface toward a distal direction, and a recessed portion which is continuous from the end of a holder shaft. A cylindrical body supported so as to freely rotate in the hole, a blade provided so that the cutting edge projects from the outer peripheral surface of the tip of the holder shaft, and the rotation of the holder shaft with respect to the base body within a range of 180 degrees. And a stopper device provided so that the base body and the holder shaft rotate together.
A slidable piston incorporated in the rear of the cylindrical body of the recessed hole, a spring for giving a restoring force to push back the piston in the direction of the cylindrical body, and a cylinder connected to the end of the piston and having the cylindrical shape. A projection shaft slidably fitted in the body, and a transmission provided on the outer circumference of the projection shaft and the inner circumference of the tubular body so as to convert the sliding of the projection shaft into 180-degree rotation of the tubular body. A mechanism, a cylinder provided outside the tip of the base so that the base can rotate freely, and provided on the cylinder so as to engage with the spindle bearing side when the base is connected to the spindle. The engaging portion, a locking device for releasing the rotation stop provided on the base body and the tubular body due to the engagement between the engaging portion and the spindle bearing side, and the tubular body and the base body from the engaging portion. Apply fluid pressure to the side of the base of the piston. Cutting tool consisting of the provided passage so as to use.