JPH0714801Y2 - Measuring tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a measuring tool, mainly a measuring tool which is attached to a spindle of a machine tool and is used for positioning an origin in an axial direction (Z axis) of the spindle.

Generally, in a machine tool, as shown in FIG. 1, Z from the reference dimension position GL of the taper hole 2 of the spindle 1 to the reference measurement surface M (or jig mounting surface, work reference surface) of the table 5 It is necessary to measure an accurate reference dimension L (absolute dimension) in the axial direction. This is because the reference dimension position GL varies from spindle to spindle due to the problem of machining accuracy, and the machining accuracy of the workpiece cannot be expected to be improved unless the reference dimension L is accurately measured for each spindle. Further, the machining of the work causes a temperature change in the machine, which causes an error in the reference dimension L and the like. Therefore, the reference dimension must be regularly confirmed and corrected.

Further, as shown in FIG. 2, the same is true of a machine tool provided with a rotatable pallet table 6, and in this one, a work or the like is installed with reference to the locators 7, 7 '. As a reference, Z-axis positioning is required. Therefore, the reference dimension in the Z-axis direction is set to L from the reference dimension position GL to the center of the table to the reference measurement surface M,
The dimensions are the sum of dimensions L ₁ and L ₁ ′ up to M ′. Normally, locators 7 and 7'are installed in two places, but their dimensions L ₁ and L ₁ ′
Because there are errors, and even when several pallet tables 6 are used, there are processing dimension errors.

Here, an example of the conventional measuring method is shown in FIG. This method uses the test bar 8, and the taper shank portion 9 of the test bar 8 is inserted into the taper hole 2 of the machine spindle 1.
While the spindle 1 is lowered to some extent, the block gauge 3 is manually slid and inserted between the tip of the test bar 8 and the measurement reference plane M, and the spindle 1 is positioned by the feel of sliding.

However, in this method, since the block gauge 3 is slid to determine the reference dimension L by touch, a measurement error is inevitable, individual differences are large, setup is complicated, and long time is required for measurement. There is also a risk of scratching. In addition, the measurement reference plane M requires a certain area,
It also has the drawback that it cannot measure on a narrow surface, and because it is not a method of reading the scale of a dial gauge, comparative measurement is inaccurate and difficult.

The present invention has been made in view of the above-mentioned drawbacks, and an object thereof is to provide a measuring tool capable of accurately and easily measuring the reference dimension of the Z axis of a machine tool spindle.

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

Referring to FIG. 4, the measuring tool according to the present invention is generally shown in the main body 10
And a dial gauge 15 and a cap 20.

The main body 10 is integrally formed with a shank portion 11 having the same taper as the machine main shaft at the rear end (upper end in the figure), a well-known dial gauge 15 is installed inside, and the probe 16 has a tip screw portion. It is slightly protruding from 12.

The cap 20 serves to protect the probe 16, and is attachable to and detachable from the screw portion 12. The bottom 21 of the cap pushes the probe 16 in a fixed amount when it is screwed onto the threaded portion 12. At this time, the dimension from the reference dimension position GL to the tip of the probe 16 is, for example, 200.00 as the Z-axis dimension L. The measured value is accurately adjusted to mm, and the measured value is printed on the surface of the main body 10. That is, it is possible to perform zero adjustment or zero confirmation of the dial gauge 15 with the cap 20.

Next, a method of using the measuring tool having the above configuration will be described with reference to FIG.

FIG. 5 shows a case where the Z-axis reference dimension L is measured. First,
As a pre-process, zero adjustment of dial gauge 15 and cap 20
With the dial attached, adjust the dial scale zero to the pointer of the dial gauge 15, then remove the cap 20, then insert and fix the shank portion 11 of the main body 10 into the tapered hole 2 of the main spindle 1 to loosen the main spindle 1. The probe 16 is lowered, and the probe 16 is put on the reference measurement surface M, and stopped at the position where the pointer of the dial gauge 15 indicates the zero scale. The reference dimension L is now exactly 200.00
It has been set to mm.

As shown in FIG. 4, a well-known centering arm 25 and a test indicator 30 are attached to the cap 20 to measure the position of the reference hole and the parallelism and squareness of the reference plane. You can also

That is, the centering arm 25 attaches the shaft 26 to the cap 20.
It can be freely attached to and detached from the hole 22 and is rotatable about a pin 27. Further, the test indicator 30 is rotatable on the centering arm 25 with the pin 31 as a fulcrum, and the measurement value thereof is read by the scale section 32.

FIG. 6A shows the case where the position of the reference hole 5a is measured.
The cap 20 is attached to the cap 10, the centering arm 25 and the test indicator 30 are attached to the cap 20, the probe 33 of the test indicator 30 is inserted into the reference hole 5a, and the spindle 1 is rotated to perform position measurement.

Further, FIG. 6B shows the measurement of the parallelism and the squareness of the reference plane N. The parallelism and the straightness are measured while moving the spindle 1 or the table vertically and vertically with the probe 33 of the test indicator 30 along the reference plane N. Measure the angle.

As is apparent from the above description, the present invention has a main body integrally provided with a shank portion having the same taper as the machine main shaft at the rear end, and is fixed in the main body so that the probe is projected from the tip of the main body. With the dial gauge and the body completely attached to the tip of the body, the bottom portion abuts the tip of the probe to push the probe in a certain amount, and the measurement is performed by abutting the cap from the reference dimension position of the machine spindle. Since it has a cap that sets the distance to the tip of the probe to a certain size, it is a simple operation to put the probe on the measurement reference surface with the shank part inserted in the taper hole of the spindle of the machine tool. It is possible to accurately measure the reference dimension, and it is possible to greatly improve the conventional measurement that relied on the skill and intuition of the measurer.
Of course, the absolute dimensions can be read directly and can be used even if the reference plane is narrow. In addition, the cap also protects the dial gauge probe protruding from the main body and prevents damage to the probe. Further, since the test indicator can be easily attached to the cap, the measuring tool with the test indicator attached can be attached to the machine spindle, and the parallelism or perpendicularity of the reference plane can be measured while moving the machine spindle or the table. .

[Brief description of drawings]

1 and 2 are explanatory diagrams related to measurement of standard dimensions, and FIG.
FIG. 4 is a front view showing a conventional measuring method, FIG. 4 is a front view showing an embodiment of a measuring tool according to the present invention, FIG. 5 is an explanatory view of how to use it, and FIGS. 6A and 6B are books. It is explanatory drawing at the time of utilizing the measuring tool which concerns on a device for other measuring methods. 1 ... Spindle, 10 ... Main body, 11 ... Shank part, 12 ... Screw part, 15
… Dial gauge, 16… Sensor, 20… Cap, 21… Bottom of cap.

Claims (1)

[Scope of utility model registration request] 1. A main body integrally provided with a shank portion having the same taper as that of a machine main shaft at a rear end thereof, a dial gauge fixed in the main body and having a probe protruding from a front end of the main body, With the tip completely attached, the bottom part contacts the tip of the probe and pushes the probe in a certain amount, and the distance from the reference dimension position of the machine spindle to the tip of the probe contacting the cap is fixed. A measuring tool characterized by comprising a cap that is set to the dimension of.