JPH0413609Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Field of Application> This invention mainly relates to a gauge for inspecting squareness errors in orthogonal motion of three-dimensional coordinate measuring machines, machine tools, and the like.

<Prior Art> In high-precision machines having orthogonal motion as described above, high-precision inspection devices that use autocollimators or laser beams are provided as squareness inspection devices to improve or maintain orthogonality accuracy. However, the equipment was not only complicated and expensive, but also difficult to handle and operate, requiring a long time for testing, and was not commonly used for daily use. On the other hand, right angle gauges, cylindrical scorers, etc., which are used as extremely simple methods, have limitations in their own high-precision machining, and not only are errors likely to occur depending on how they are handled, but it is also difficult to verify the gauge itself. It was hot.

Furthermore, Utility Model Application No. 52-154627 has been filed based on the same principle, but this has the drawback that the support mechanism for the cylinder of the central shaft is complicated and errors occur due to rotation of the shaft, and the object to be measured in the driven part is Since the bar in the section is an arbitrarily set point on a straight line, it is difficult to determine the measurement point precisely, and the accuracy is not good.

<Purpose of the present invention> The present invention was devised in view of the above-mentioned points, and provides a squareness gauge that is capable of higher precision inspection than the above-mentioned simple gauges, is practical, and is simple in structure and operation. This is what I am trying to do.

<Example> A preferred example of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, a conical catch seat 2 facing upward is formed at one end of a rectangular base 1, and a groove is provided at the other end in the same direction as the longitudinal direction of the base 1. A groove catch seat 3 is formed. Support balls 4 and 5 each have good sphericity, and are connected by a connecting shaft 6 so as to be placed on the respective seats 2 and 3. The bottom surface of the base 1 and the seats 2, 3 are formed so that when the support balls 4, 5 are seated, Y--Y, which connects the bottom surface and the center of the support balls, becomes parallel. Reference numeral 7 denotes a moving shaft extending from the intermediate portion of the connecting shaft 6 at a substantially right angle to the shaft, and a moving ball 8 having good sphericity is attached to the tip end thereof as a reference portion. Reference numeral 9 indicates that the movable ball 8 is attached to the support balls 4 and 5 in order to improve workability when rotating and setting the movable ball 8.
This is a stopper attached near the tip of the moving shaft 7 in order to stabilize it at approximately the same height as
It is made removable so that it can be replaced with the stable support side. A magnet 10 is embedded in the bottom of the seat 2 on which one of the supporting balls 4 is seated, and allows the supporting balls 4 to be seated stably.

In the configuration as described above, the moving column (X, Y) of the three-dimensional coordinate measuring machine (not shown) is then
The third test is when inspecting the perpendicular accuracy of the Z-axis, etc.
This will be explained using figures.

First, the base 1 is placed on the table of the measuring machine with the imaginary center line of the support balls 4 and 5 of the proposed gauge positioned approximately parallel to the y-axis of the measuring machine. Then, the center coordinates of the support balls 4 and 5 are detected by the probe of the measuring machine, and a line connecting the center points is drawn as the center line Y-
Y, that is, the Y-axis direction reference axis. Next, the center coordinates P of the moving ball 8, which has been tilted to one side and stabilized, is similarly detected by the probe (FIG. 3, solid line state). Next, the moving sphere 8 is inverted 180 degrees around the center line Y-Y (dotted line state in Figures 2 and 3), and the center coordinate _P1 of the moving sphere 8 at that position is similarly determined using a probe. To detect. Even if the moving axis 7 is tilted to the center line Y-Y, the reversal locus of the moving ball 8 on the plane will be perpendicular to the center line Y-Y if this is the center line X-X. Therefore, if the difference between the coordinate values of _one point P and P in the Y-axis direction is detected as described above, it will be determined as the squareness error of the measuring machine in the Y-axis direction with respect to the X-axis.

Regarding the perpendicularity of the Z-axis direction of the measuring device to the X-axis, for ease of understanding, it is assumed that the moving axis 7 is set vertically, that is, the center point of the moving ball 8 is located on the YY line. Then, since the X-Y coordinate values of the center coordinate P ₂ of the moving sphere 8 at the vertical position are known, the probe is brought into contact with the moving sphere 8 and compared with the value read by the probe at the coordinate P ₂ at that time. Then, the amount of vertical movement of the measuring machine on the Z axis,
That is, the verticality in the Z direction due to the movement of the probe from point O to _P2 in FIG. 3, in other words, the perpendicularity error of the Z axis of the measuring device with respect to the Y axis is determined. Regarding this Z direction, the X of the moving ball 8
The direction locus is the same as the center line XX, and the only difference is the height position (Z direction), so it is not necessarily necessary to measure at the vertical position as described above.
It may be tilted, but in order to improve accuracy
It goes without saying that the larger the amount of movement in the axial direction, the better, and therefore a substantially vertical position where the reference portion is at its maximum height is preferable.

It is obvious from the above that the perpendicularity of the Z axis with respect to the X axis can also be determined as is by applying the above method, without needing to explain it again.

In the above explanation, the reference part for detecting the predetermined coordinate values was described using the moving sphere 8 as a sphere, but this is a coordinate measuring machine that uses the coordinates of the probe to detect the sphere from the coordinate values. The coordinates of the center of can be found accurately and easily.

Furthermore, although a case has been described in which there is one moving axis and one reference part, a plurality of reference parts etc. may be provided on the connecting shaft 6 at appropriate intervals. It can be found by

<Effects> As stated above, the gauge of the proposed configuration has a simple configuration and can be used for convenient and highly accurate squareness measurement, and it is an inexpensive, durable, and reliable gauge. Angle gauge can be provided.

In the present invention, it is possible to detect the coordinates of the orthogonal plane only from the relative positions of the three balls, and the machining accuracy of the connecting shafts 6 and 7 between the balls is not relevant, and the contact between the table and the rotating part Since there are few points, it is easy to work with, and has the characteristics of very little error due to rotation.

In particular, the proposed gauge has a pair of spherical members that support the moving shaft and the reference part, which are seated on conical and V-groove seats, respectively, so that it can withstand expansion and contraction due to temperature changes during use. You can always obtain a reliable gauge with stable accuracy.

[Brief explanation of drawings]

FIG. 1 is a plan view of the present invention, FIG. 2 is a sectional view taken along the line -- in FIG. 1...Base, 2...Conical catch, 3...V groove catch, 4, 5...Support ball, 6...Connection shaft, 7...Movement axis, 8...Reference part, 9...Stopper , 10...
Magnet.

Claims (1)

[Scope of Claim for Utility Model Registration] A base having a conical catch with a magnet embedded in the bottom and a V-groove catch at both ends, two supporting balls rotatably seated on the seats and connected to each other. , A squareness gauge characterized in that it is attached almost at right angles to the connecting part between the support balls and is constructed by a moving shaft having a reference ball at the tip.