JPS6029411Y2 - Cutting tool edge position measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a measuring device for measuring the position of a cutting edge of a cutting tool, particularly a cutting tool having a large number of cutting edges.

As is well known, the machining accuracy when machining is performed with a machine tool depends not only on the accuracy of the machine tool itself, but also on the accuracy of the cutting tool used. Must be well configured.

Normally, the position of the cutting edge of a cutting tool is determined based on both the outer diameter or inner diameter of the tool, and the width or runout of the tool, but in any case, it is determined based on the dimensions from the reference position.

For example, in a cutting tool that has an even number of cutting edges or indexable inserts on the outer periphery of the tool body, the center of the tool body is used as the reference position, or the diameter of each cutting edge is determined by the corresponding dimension between the cutting edges. For cutting tools that have an odd number of cutting edges or indexable tips on the outer periphery of the tool body, the position of each cutting edge is determined using the center of the tool body or the bottom of the chip pocket as the reference position. It can be decided.

However, in the case of so-called internal cutters, which have multiple indexable inserts attached to the inner circumference of an annular tool body, the center of the tool body exists in space, so it should be used as the reference position for measuring the cutting edge. Moreover, for tools equipped with an odd number of indexable inserts, there is no corresponding diameter, so the cutting edge position cannot be determined by measuring the inner diameter.

Furthermore, when determining the position of the cutting edge based on the chip pocket,
Since the position of the cutting edge must be measured for each indexable tip, this work requires a great deal of time, and the position of the cutting edge, especially the position of the cutting edge as the inner diameter, cannot be made with high accuracy.

Furthermore, measurement of runout in compound-edged cutting tools is
It would be possible to determine the runout of any one indexable tip and measure the runout of the other indexable tips based on this, but this requires a measuring device with a highly accurate sliding mechanism. Practically unfavorable.

In any case, it can be said that conventional measuring devices and measuring methods can be applied to any cutting tool, but they are hardly practical for measuring the cutting edge position of multi-blade internal cutters. There wasn't.

The present invention was developed in view of the above circumstances, and aims to provide a blade edge position measuring device that can easily and quickly measure the blade edge position without causing measurement errors. .

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

In the figure, reference numeral 1 denotes a machine stand, and a rotary table 2 is mounted on this machine stand 1.

This rotating table 2 consists of a base part 2a rotatably attached to the machine stand 1 with a bearing 3, and a tool support part 2b detachably mounted on this base part 2a. A tool to be measured T can be attached to the upper end.

That is, as shown in the figure, the tool support part 2b has a cylindrical shape with an open upper end, and a locking part 4 for locking the peripheral edge of the tool T to be measured is formed on the inner peripheral side of the upper end. In addition, a screw hole 6 is formed in the locking part 4 at a location corresponding to the bolt hole 5 of the tool to be measured T, and furthermore, a screw hole 6 is formed in the upper end edge of the tool support part 2b at four diametrically opposed locations. That is, the key 7 is fixed at a location corresponding to the keyway of the tool T to be measured.

A reference pin 8 is erected at a predetermined location on the base plate of the tool support section 2b, and the tip end 8a of this reference pin 8 is attached to one of the chips of the tool T to be measured attached to the tool support section 2b. A part of the outer circumferential surface of the pocket portion extends into the pocket portion and matches the inner diameter position of the tool T to be measured, and serves as a measurement reference.

Next, a measurement procedure will be described using a compound-blade indexable internal cutter as an example of the tool T to be measured.

First, the peripheral edge of the tool T to be measured is locked in the locking part 4, and the tool T is positioned using the key 7 and attached to the upper end part of the tool support part 2b.

In this case, the tip 8a of the reference pin 8 is located in one of the chip pockets as shown in FIG. It has become.

On the other hand, a stand S is erected at a predetermined location on the machine base 1, and a dial gauge G is fixed to the tip of an arm portion a extending from the stand S.

Then, the dial gauge G is placed inside the tool to be measured T, and the tip of the spindle is connected to the tip of the reference pin 8.
It abuts against the outer circumferential surface that serves as the measurement reference for a, and this is taken as the zero point position.

After that, while keeping the dial gauge G fixed, the tool T to be measured is rotated together with the tool support part 2b, and the dial gauge G is rotated.
By sequentially abutting the tip of the spindle against the cutting edge of each indexable tip C, it is possible to measure the dimension of each cutting edge from the measurement standard, that is, the dimension from the inner diameter dimension position.

In addition, when measuring the runout of each cutting edge, the height of the reference pin 8 is known in advance, or a step is provided at a location with a known height, and the tip of the reference pin 8 or the step is By using this as the reference position for runout measurement, the runout of each cutting edge can be measured as a dimension from the reference position.

Therefore, by adjusting the mounting position of each indexable tip C based on the above measurement results, the tool T to be measured can be made as designed.

In addition, when attaching the tool T to be measured to the tool support part 2b, the deflection of the tool T to be measured can be eliminated by fixing it with an appropriate bolt that is inserted into the bolt hole 5 and screwed into the screw hole 6. Needless to say, this results in more accurate measurements.

Further, as is clear from the above description, since the tool support part and the tool to be measured have a one-to-one correspondence, it is only necessary to replace the tool support part with one that matches the tool support for each different tool to be measured.

As explained above, according to the cutting edge position measurement according to the present invention, since the tool support part and the reference pin whose tip extends near the cutting edge of the tool to be measured attached thereto are provided, It is possible to measure each cutting edge position using the reference pin as the reference position for measurement without having to set the reference position for measurement at any position on the tool to be measured, and the measurement can be performed for each cutting edge. Therefore, the position of the cutting edge can be easily and quickly and accurately measured even for tools with compound blades in which the mounting positions of each cutting blade are slightly different, or tools with an odd number of cutting blades. be able to.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted plan view showing an embodiment of the present invention;
FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG. 3 is a detailed view of the section ■ in FIG. 1... Machine base, 2... Turntable, 2a...
・・・Base part, 2b...Tool support part, end ・
...Reference pin, 8a...Tip (of reference pin), T...Tool to be measured.

Claims (1)

[Scope of utility model registration request] A rotary table having a tool support part is rotatably provided on the machine table, and a reference pin indicating a reference position for measurement is placed on the rotary table so that the tip thereof is located near the cutting edge of the tool to be measured. A cutting tool blade edge position measuring device characterized by being installed vertically.