JPS59208401A - Right-angle degree measuring device utilizing spherical bodies - Google Patents

Abstract

PURPOSE:To make it possible to perform highly accurate measurement simply, by a simple mechanism wherein two spherical bodies having slightly different sizes are arranged along the same vertical line. CONSTITUTION:Two steel balls are provided. A small ball is a fixed ball 1 and fixed on a surface plate 2 by a steel-ball holding tool 3. A large ball is a moving ball 4 and soldered to a slider 5 through a thin plate spring 6. The slider 5 is vertically moved along a supporting post 7. When a material to be measured 10 is pushed to the two balls 1 and 4 along a guide 11, the material 10 is first contacted with the moving ball 4. When the material 10 is further pushed forward, it is contacted with the fixed ball 1 and stopped. At this time, the amount of displacement of the moving ball 4 is measured by a displacement detector 9. Then the material to be measured 10 is reversed and positioned at an axially symmetrical location with respect to the steel balls 1 and 4. The amount of displacement of the moving ball 4 is measured by the same procedure. Based on the sum of the two amounts of displacements obtained in the procedure and the difference in nominal dimensions of the two steel balls 1 and 4, the measure of a right angle is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that a simple mechanism arranged on a perpendicular line enables simple and highly accurate measurement.

Conventional measurements using a square ruler include the gap bamboo removal method using a standard square ruler and a block gauge as shown in Figure 1, and the second method.
Comparison method with a reference square ruler using a dial gauge as shown in the figure, and a micrometer as shown in Figure 3.
The use of a square ruler tester with a structure that adjusts the gap, and the use of a square ruler tester with two indicators installed with spindles of the same size in the O 1- as shown in Figure 4, etc. The main thing.

In Figures 1 to 5, 1 is the square ruler to be measured, 2
3 is a surface plate, 3 is a reference angle ruler, 4 is a dial gauge, 5 is a port, 6 is a micrometer, 7 is an indicator, and 8 is a spindle.

have been widely adopted.

j, □;, both the precision and the shape accuracy are good, and in the precision class, the mutual difference and sphericity are both less than 0.5μ, and the strength against external forces is also high.

Embodiments of the present invention will be described in detail below based on two drawings.

FIGS. 6A and 6B show the structure of the present invention. The steel ball holder 3 is fixed on the diameter difference of -4-suh, and the large ball is used as the swinging ball 4 and is brazed to the slider 5 via a thin plate spring 6. Furthermore, the slider 5 is attached to the support 7. Make a vertical motion along. When an external force parallel to the surface plate 2 is applied to the thin plate spring 6 at a right angle to the rocking ball 4, it performs an approximate linear motion within the range of the dimensional difference between the four rocking balls and the two balls, and the external force is removed. If so, I will inform you of the neutral point. The line connecting the center of the rocking ball 4 stationary at the neutral point and the fixing method 1 is the fixed position of the fine movement device 8 attached to the slider 5 and the steel ball holder 3 so that it is perpendicular to the surface plate 2. It can be adjusted by moving.

When the object to be measured 10 is pushed toward the two steel balls 1 and 4 along the guide 11, it first comes into contact with the rocking ball 4;
It is further pushed forward until it comes into contact with Fixing Method 1 and stops. At this time, the amount of deviation of the rocking ball 4 is measured by the deviation detector 9. Subsequently, the object to be measured 10 is turned over and placed in a position symmetrical to the steel balls 1 and 4, and the amount of deviation of the rocking ball 4 is measured in the same manner. One perpendicularity can be determined from the sum of the two deviations obtained by this operation and the difference between the nominal dimensions of the two steel balls 1 and 4.

The features of this device include not only the ability to measure squareness extremely easily, but also point contact using one spherical terminal, which results in fewer errors due to the shape and orientation of the contact surface, compared to methods that contact four surfaces or lines.

Furthermore, since the object to be measured 10 is inverted during measurement, it also has the advantage that errors caused by the tilting of the measurement surface with respect to the sides of the two steel balls 1 can be canceled out.

The fine movement device 8
By adjusting , the arrangement of the two balls becomes practically perpendicular to the surface plate.

j-+ Figure 7^, B shows an example of the steel ball holder 3. The steel ball 1 is fixed to the surface plate 2 by fastening two retaining plates 12 and 13 with screws 14, which have a cylindrical recess, making it possible to easily replace the steel ball 1. In experiments in which impact forces of 100 to 150 g were repeatedly applied, reproducibility within 1 μm was obtained. Figure 8 shows an example of the deflection detector 9, which is an electric micrometer detector that has been modified by removing the fill flap, replacing the tip 15 with one rocking ball 4 attached, and changing the measurement direction. No operation was required, the measuring force was small, the indicated value was stable, and the reproducibility when the rocking ball was repeatedly deflected was within 1 μm.

3- What are the characteristics of this measuring device? Here are 2.3 examples of applications that take advantage of this.

FIGS. 9A and 9B show an example of a device in which a plurality of detectors 9 are provided on a support 7 and the squareness at different measurement positions is measured with one operation.
The straightness of the measurement surface can also be determined using this method. 1st
0 Figures A and B are.

This is an example of a device that measures the perpendicularity between the outside 1 historical surface 17 and the internal usage surface 18 by inserting a 16 ft spacer under the steel ball holder 3 to raise the height of the fixing method 1. Parallelism of the facing surfaces of objects? You can ask for it.

As is clear from the above details, the measuring device according to the present invention uses a commercially available steel ball as a dimension standard, so an angle reference device is not required, and if the steel ball is damaged or worn, it can be easily and inexpensively measured. Is it possible to change the squareness with high accuracy in a short time with simple operation? can be measured.

[Brief explanation of the drawing]

Figures 1 to 5 are front views of conventional measurement examples, and Figure 6A.
. B is a front entrance and side view showing an embodiment of the present invention, and FIG. 7A. A front view and a plan view showing an embodiment of the steel ball holder, FIG. 8 is a sectional view showing the entire embodiment of the deflection detector, and FIGS. 9A and B
10A and 10B show a front view and a side view of an application example of the present invention. 1...Fixing method 2...Surface plate 4-6...Thin plate spring 8...Fine movement device 9...・Deflection detector Fig. 1 Fig. 20 Fig. 3 Fig. 4

Claims (1)

[Claims] Of the two spheres with slightly different dimensions, the small sphere is fixed on a surface plate, and the large sphere is held above the small sphere by a thin plate that springs so that it can move parallel to the surface of the surface plate by external force, and Amount of deviation in a small straight line section