JPH0623607A - Holder for cutting tool - Google Patents

Abstract

PURPOSE:To provide a cutting tool holder at which the correction of an edge tip position and the exchange of chips can be conducted simply and in a short time without requiring skill. CONSTITUTION:In the case of a cutting tool holder which is arragned so that what retains a sticklike cutting tool 12 having an edge tip 13a at its tip may be fitted to the main spindle end portion of a cutting machine, the above sticklike cutting tool 12 is inserted into a retaining hole 11c piercingly provided along an axis from the tip portion of this holder main body 11. The base portion 12a of this cutting tool 12 is fixed at the holder main body 11, and at the same time on the tip side of the holder main body 11, the cutting tool 12 is pushingly pressed by means of a bolt 16 from a direction which meets at right angles with the axis of the cutting tool 12, and the position of the edge tip 13a at the tip of the cutting tool 12 is made movable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool holder attached to the end of a spindle of a cutting machine used for boring and the like.

[0002]

2. Description of the Related Art FIGS. 5 and 6 show an example of a cutting tool holder conventionally used for boring and the like. In FIG. 5, 1 is an end of a main shaft (not shown) of a boring machine. It is a stepped cylindrical holder body that is attached to the base portion, and the base portion is thick and gradually tapered toward the tip. Reference numeral 1a is a flange portion formed on the base portion, 1b is a spigot portion that fits with the main shaft of the boring machine, 1c (see FIG. 6) is a bite insertion hole formed obliquely at the tip of the holder body 1, and 1d is This bite insertion hole 1c
Is a small-diameter screw hole that is concentrically connected with the screw hole. 2 is a round bite made of special carbide material inserted in the bite insertion hole 1c.
Reference numeral 2a is its blade edge, 3 is an adjusting bolt screwed into the screw hole 1d, and 3a is a hexagonal hole for tool insertion. Further, 4 (see FIG. 5) is a lock bolt for fixing the round cutting tool 2.

In the above apparatus, when the cutting edge 2a of the round cutting tool 2 is worn by repeated use, it is necessary to correct the amount corresponding to the amount of wear. If the above correction is further performed several times, the sharpness of the cutting edge 2a will deteriorate, so
Will be removed and replaced with another round bite 2.
Then, the removed round bite 2 is ground and stored as a replacement.

At the time of correcting the position of the cutting edge 2a or reattaching it, a dial gauge or the like is usually set at the tip of the cutting edge 2a for positioning, and adjustment is performed in the following manner. First, the lock bolt 4 is loosened slightly and the round bite 2 is temporarily tightened. Then, while looking at the scale of the dial gauge, with the adjusting bolt 3 which inserts a tool (not shown) such as a hexagon wrench into the hexagonal hole 3a to rotate the bottom portion of the round bite 2 inserted into the bite insertion hole 1c. By pushing up, the blade tip 2a is projected. At this time, the lock bolt 4 is temporarily tightened in order to eliminate the influence of the backlash between the round bite 2 and the bite insertion hole 1c, such as the inclination of the round bite 2.

[0005]

However, in the above-mentioned conventional apparatus, since the round cutting tool 2 is temporarily tightened when the positioning of the round cutting tool 2 is adjusted, it is difficult to finely adjust the adjustment tool 3 and sometimes the round cutting tool 2 is used. May over-project. In this case, the set dial gauge is removed, the lock bolt 4 is completely loosened, the round bite 2 is pushed back, the dial gauge is set again, and the adjustment work is repeated from the beginning. Therefore, in the conventional case, there is a problem that the correction work accompanying the wear of the cutting edge and the replacement work of the cutting edge are very difficult and require skill.

[0006]

In order to solve the above problems, in the present invention, a cutting tool holding a rod-shaped cutting tool having a cutting edge at its tip is attached to the end of the spindle of a cutting machine. In the holder for a holder, the rod-shaped cutting tool is inserted into a holding hole formed along the axis from the tip of the holder body, and the base of the cutting tool is fixed to the holder body. On the tip side, the cutting tool is pressed from the direction orthogonal to its axis to make the cutting edge position of the tip of the cutting tool movable, thereby forming a cutting tool holder.

[0007]

As described above, according to the present invention, a rod-shaped cutting tool is inserted into the holding hole formed along the axis from the tip of the holder body, and the base of the cutting tool is fixed to the holder body. At the same time, by pressing the cutting tool on the tip side of the holder main body from the direction orthogonal to its axis to make the cutting edge position of the cutting tool tip movable, it is possible to perform correction work accompanying wear of the cutting edge position. The tip replacement work does not require skill and can be performed easily and in a short time.
Further, various exchangeable tips can be used, and it is possible to perform stable quality processing without the need for skillful blade edge polishing.
As the replaceable tip, a ceramic tip or a tip hardened by coating titanium or the like can be used, so that the tool has a long life.

[0008]

Embodiments of the present invention will be described below with reference to FIGS. In the figure, 11 is a holder main body formed in a stepped cylindrical shape so as to be attached to the end of the main shaft of a cutting machine such as a boring machine, the base of which is thick and gradually tapered toward the tip. Reference numeral 11a is a flange portion provided on the base portion thereof, and 11b is a spigot portion into which the main shaft of the cutting machine is fitted.

Reference numeral 12 is a rod-shaped cutting tool having a tip 13 having a cutting edge 13a fixed to it by bolts 14, and a holding hole 11c into which the rod-shaped cutting tool 12 is inserted is formed from the tip of the holder body 11 to the holder body 11. While drilling along the axis of
An escape groove 11d that allows the rod-shaped cutting tool 12 to move is formed on the tip side of the intermediate portion A (see FIG. 1) of the holding hole 11c. Instead of the escape groove 11d, a notch reaching the outer circumference of the holder body 11 may be provided.

The rod-shaped cutting tool 12 is inserted into the holding hole 11c formed in the holder body 11 as described above, and the base portion 12a of the cutting tool 12 is provided in the holder body 11 with the screw hole 11 formed therein.
It is fixed through a bolt 15 screwed into e, and a screw hole 11f is provided in the holder body 11 on the opposite side of the relief groove 11d at the tip side of the holder body 11, and cutting is performed by the bolt 16 screwed into the screw hole 11f. By pressing the tool 12 in a direction orthogonal to the axis thereof and elastically deforming the tip side of the rod-shaped cutting tool 12 from the point A, the position of the cutting edge 13a at the tip of the cutting tool 12 can be moved. 15
Reference characters a and 16a are hexagonal holes provided for rotating the bolts 15 and 16 with a hexagonal tool.

Reference numeral 17 shown in FIG. 2 denotes a bolt for suppressing vibration caused by cutting of the cutting tool 12, and 17a is a hexagonal hole thereof. Further, FIG. 3 shows a state in which an object 18 to be cut is bored by a cutting tool 12 which rotates integrally with a spindle. The blade of the cutting tool that can be used in the present invention may have a triangular shape, a replaceable tip, a square shape, a rhombus shape, a round shape, or another irregular shape tip, or a solid type in which the blade is integrated with the rod-shaped cutting tool 12. . Further, the fixing method in the case of the replaceable tip is also a clamp method using a holding piece 19 as shown in FIG.
In addition, various types such as a pin lock type and a lever lock type can be applied.

The procedure for adjusting the position of the cutting edge 13a of this embodiment is as follows.
A dial gauge is brought into contact with the tip of the cutting edge 13a, and the adjusting bolt 16 is rotated until it reaches a predetermined position. By doing so, the tip end side of the cutting tool 12 is elastically deformed and bent with the point A as a fulcrum, so that the position of the cutting edge 13a can be projected or retracted by its spring force. Further, since the adjusting bolt 16 always receives the elastic force of the rod-shaped cutting tool 12, it is not necessary to prevent it from loosening.

[0013]

As described above, according to the present invention, in the holding hole 11c formed along the axis from the tip of the holder body 11,
Insert a bar-shaped cutting tool 12 and insert the base 12
a is fixed to the holder main body 11, and the cutting tool 12 is pressed on the tip side of the holder main body 11 from a direction orthogonal to the axis thereof so that the cutting edge 12a of the tip of the cutting tool 12
Therefore, according to the present invention, the correction work accompanying the wear of the cutting edge position and the replacement work of the tip 13 do not require skill, and can be easily performed in a short time. Is obtained. Further, various exchangeable tips can be used, and it is possible to perform stable quality processing without the need for skillful blade edge polishing. As the replaceable tip, a ceramic tip or a tip hardened by coating titanium or the like can be used, so that the effect of prolonging the life of the tool can be obtained.

[Brief description of drawings]

FIG. 1 is a side view showing a partial cross-section of a holder for a cutting tool according to the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a partial view showing a use state of the cutting tool according to the present invention.

FIG. 4 is a view showing another embodiment of the cutting edge portion of the cutting tool.

FIG. 5 is a side view showing an example of a conventional device.

6 is a cross-sectional view of the tip portion of FIG.

[Explanation of symbols]

 1 Holder Main Body 2 Round Tool 3 Adjusting Bolt 4 Lock Bolt 11 Holder Main Body 11a Collar 11b Inlay Part 11c Holding Hole 11d Relief Groove 11e Screw Hole 11f Screw Hole 12 Cutting Tool 12a Base 13 Tip 13a Cutting Edge 14 Bolt 15 Bolt 16 Bolt (Bolt Bolt) 17 Bolt 18 Workpiece 19 Rest piece

Claims (1)

[Claims] 1. A holder for a cutting tool, wherein a rod-shaped cutting tool having a cutting edge at its tip is held at the end of a spindle of a cutting machine, and a holder is provided along the axis from the tip of the holder body. The rod-shaped cutting tool is inserted into the holding hole, the base of the cutting tool is fixed to the holder body, and the cutting tool is pressed from the direction orthogonal to the axis on the tip side of the holder body. A cutting tool holder characterized in that the cutting edge position of the cutting tool tip is movable.