JPS5811452Y2 - Bit holder for groove machining - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a holder for a cutting tool for machining grooves on the inner diameter of a workpiece.

An object of the present invention is to automatically insert and remove a cutting tool for groove machining in the radial direction by forward and backward movement of a spindle, and to process grooves in a fixed position with high precision.

When machining a concave groove on the inside diameter of a workpiece, the cutting tool is placed in the machining position with respect to the fixed workpiece, the cutting tool is rotated, the slide shaft is advanced, and the cutting tool protrudes in the radial direction to cut the groove. However, with conventional tools for groove machining, the operator is responsible for inserting and removing the cutting tool.

Therefore, it is not preferable in terms of work efficiency, and there are also difficulties in processing accuracy.

The present invention provides a cutting tool holder for groove machining that eliminates these conventional problems.

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

Reference numeral 1 denotes a mounting portion which can be freely attached to and detached from a spindle of a processing machine, and has a slide shaft 2.

This slide shaft 2 is provided with an inclined surface groove 3.

Reference numeral 6 denotes a cylindrical shaft that is integrally engaged with the slide shaft 2 in the rotational direction and fitted into the cylindrical shaft hole 7 so as to be relatively slidable in the axial direction.

In this fitting structure, an engaging pin 5 is attached to the slide shaft 2 and is perpendicular to the axis thereof, while an elongated hole 8 that is long in the axial direction is provided on the cylindrical shaft 6 side, into which the retaining pin 5 engages. .

Further, a compression spring 9 is interposed in the cylinder shaft hole 7 at the tip of the slide shaft 2, so that the cylinder shaft 6 and the slide shaft 2 have elastic force in a relative direction in the axial direction.

Further, the cylinder shaft 6 holds a groove machining tool 10 that can freely move forward and backward in the radial direction, and an inclined surface 11 is formed on the bottom surface of the cutting tool 10 so as to come into contact with the inclined surface of the inclined surface groove 3 of the slide shaft 2.

Further, a spring 12 is attached to this grooving tool 10 so that the inclined surface 11 is pulled in the axial direction (backward direction) so that the inclined surface 11 always comes into contact with the inclined surface of the inclined surface groove 3.

As a means for attaching this spring 12, the slide shaft 2
A through hole 4 is bored in the radial direction of the inclined surface groove 3,
Connect one end of the spring 12 to the pin 13 through the through hole 4.
The other end is hooked to the cylindrical shaft 6 by the pin 14, and the other end is hooked to the grooving tool 10 by the pin 14.

Further, a pilot 15 is rotatably supported at the tip of the cylinder shaft 6.

This pilot 15 comes into contact with a workpiece reference plane B located on the center line of the inner diameter of the workpiece W to be cut into the groove A by the groove machining tool 10, and the pilot 15 comes into contact with the workpiece reference plane B, which is located at an angle of 90 ) is a cone with the same angle.

A support shaft 16 is integrally formed on the center line of the pilot 15, and is supported at the tip of the cylindrical shaft 6 by two-way bearings including a slide bearing 17 and a needle bearing 18.

The reference numeral 19 in FIG. 2 indicates a steady rest piece attached to the cylinder shaft 6.

Next, the operation of the above configuration will be explained.

The mounting portion 1 is fitted onto a spindle (which allows rotation and forward/backward feed movement) of a processing machine (not shown).

When the spindle is in its original position, the slide shaft 2 and cylinder shaft 6 extend in opposite directions, with the slide shaft 2 to the right and the cylinder shaft 6 to the left in FIG. 1 due to the elastic force of the compression spring 9. are doing.

Therefore, since the inclined surface 11 of the grooving tool 10 is in contact with the lower side of the inclined surface groove 3 of the slide shaft 3, the axial center of the grooving tool 10 is lowered from the circumferential surface of the cylindrical shaft 6 by the tensile force of the spring 12. Immersed in the side.

When receiving a command to start machining from such an original position,
Due to the rotation of the spindle, the slide shaft 2, the engagement pin 5,
Rotation is transmitted to the cylinder shaft 6 and the groove machining tool 10.

At the same time, the cylinder shaft 6 is inserted into the inner diameter of the workpiece W by rapid forward movement of the spindle, and the pilot 15 at the tip is slow fed just before it contacts the workpiece reference surface B, and the pilot 15 quietly contacts the workpiece reference surface B. .

The forward movement of the cylindrical shaft 6 is restricted by this contact with the pilot 15, and the cylindrical shaft 6 smoothly rotates relative to the pilot 15, which has stopped rotating due to the slide bearing 17 and the needle bearing 18.

Further, due to the contact of the pilot 15, the grooving tool 10 is correctly positioned at the grooving position on the inner diameter of the workpiece.

Even if the forward movement of the cylindrical shaft 6 is restricted, the spindle continues to move forward by cutting feed, so the slide shaft 2 moves forward relative to the cylindrical shaft 6 while compressing the compression spring 9, and the groove machining tool is 10 is extended in the direction of the outer diameter of the cylinder shaft 6, and a cut is made to cut the groove A on the inner diameter of the workpiece.

The depth of cut of the groove A is automatically detected and confirmed based on a preset cutting feed forward movement amount of the spindle.

When the predetermined groove machining is completed, the spindle is returned to its original position, the slide shaft 2 first begins to move backward, the compression spring 9 is expanded, and the engagement pin 5 hits the end of the elongated hole 8, and then the cylindrical shaft 6 is moved back. move backwards together.

Therefore, while only the slide shaft 2 is moving backward, the protruding grooving tool 10 is retracted in the axial direction of the cylinder shaft 6, and then the backward movement of the cylinder shaft 6 is started.
The grooving tool 10 is pulled out from the inner diameter of the workpiece and returns to its original position, completing the grooving cycle.

As described above, according to the present invention, the protruding and retracting of the grooving tool is automatically performed by the forward and backward movement of the spindle of the processing machine, eliminating the need for manual operations by the operator as in the past. Since the grooving tool is automatically positioned at a fixed position by a pilot at the tip of the cylinder shaft, there are advantages in that highly accurate grooving can be achieved and work efficiency is significantly improved.

[Brief explanation of drawings]

Figure 1 is a cross-sectional side view of the present invention, Figure 2 is Figure 1 II -
There is a cutaway view of line II. 1... Mounting part, 2... Slide shaft, 3
...Slope groove, 4...Through hole, 5...
...Engagement pin, 6...Cylinder shaft, 8...
・Long hole, 9... Compression spring, 10...
...Groove machining tool, 12...Spring, 1
5...Pilot, 16...Spindle, 1
7...Slide bearing, 18...
Needle Bearing.

Claims (1)

[Scope of utility model registration request] An inclined surface groove is provided on a slide shaft having a mounting part that is detachable from the spindle of a processing machine, and a cylindrical shaft is integrally engaged with the slide shaft in the rotational direction, and is fitted so as to be relatively slidable in the axial direction. A compression spring is interposed at the tip of the slide shaft, and the cylindrical shaft has an inclined surface in contact with the inclined surface groove so as to be able to slide relative thereto, and is movable radially forward and backward, and is always pulled back in the axial direction by a coil spring. A groove machining tool that holds a force-applied groove machining tool, and has a conical pilot that contacts the workpiece reference surface of a tapered hole supported at the tip of the cylindrical shaft so as to be relatively rotatable. holder.