JP2855064B2 - Inner sphere diameter measuring method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner sphere diameter measuring method and apparatus for measuring the inner sphere diameter of a concave spherical surface provided on an object to be measured and having a circular arc cross section.

[0002]

2. Description of the Related Art For example, the inner diameter of an annular component such as a concave spherical surface of an outboard outer of a constant velocity joint or an inner ring of a bearing,
A flow-type air micrometer is used to measure the roundness or gradient of the inner diameter.

An air micrometer of this type is provided with a plug gauge (measurement head) having a cylindrical outer peripheral surface as a probe, and a pair of nozzles are provided at the tip of the plug gauge so as to face the outer peripheral surface. Have been. Then, when measuring the inner diameter dimension with the air micrometer, after the plug gauge tip is disposed corresponding to the inner diameter surface of the inner ring of the object to be measured, compressed fluid flows from the pair of nozzles to the inner diameter surface. Injection causes the float in the tapered tube of the air micrometer display section to rise due to the back pressure. Therefore, by reading the indication of the float position, the inner diameter of the inner ring of the measured object is measured.

As shown in FIG. 6, when measuring the inner sphere diameter of a concave spherical surface F having an arc-shaped cross section provided on an object to be measured W which is an outboard outer of a constant velocity joint, first, the inner sphere is measured. A plug gauge tip portion having a diameter smaller than the diameter and having a similar shape is arranged corresponding to the concave spherical surface F. Next, after measuring the inner diameter (central diameter) of the diameter portion of the concave spherical surface F through a pair of nozzles provided at the tip of the plug gauge, the tip of the plug gauge is tilted at a predetermined angle, and one of the nozzles is moved. The nozzle is arranged so as to be directed to the vicinity of the end of the concave spherical surface F on the inlet side, and the other nozzle is arranged so as to be directed to the inner side of the concave spherical surface F. In this state, the compressed fluid is jetted to measure the diagonal diameter of the concave spherical surface F, and the tip of the plug gauge is tilted to the opposite side to measure the opposite diagonal diameter.

That is, in FIG. 6, the inner diameter of the concave spherical surface F is set by measuring the central diameter G and the diagonal diameters H1 and H2 of the concave spherical surface F.

[0006]

However, in the above prior art, when measuring the inner sphere diameter, each of the nozzles provided in the diametrical direction at the tip of the plug gauge has a concave spherical surface F.
Must face each other. If one nozzle comes off the concave spherical surface F, the compressed fluid ejected from the one nozzle flows out to the outside, so that the operation of measuring the inner spherical diameter of the concave spherical surface F becomes impossible. For this reason, in the conventional air micrometer, the measurable range α ° and the unmeasurable range β ° exist on the concave spherical surface F. However, if the diameter of the inner sphere in the non-measurable range β ° is not sufficiently controlled, problems such as fluctuations in the torque after assembling may occur, and therefore, the entire surface of the concave spherical surface F may be managed with high precision and ease. It is desired to do.

An object of the present invention is to solve this kind of problem, and it is possible to easily and accurately measure the diameter of the inner sphere of a concave spherical surface having an arc-shaped cross section provided on an object to be measured. An object of the present invention is to provide an inner sphere diameter measuring method and apparatus.

[0008]

To achieve the above object, the present invention provides an inner sphere diameter measuring method for measuring the inner sphere diameter of a concave spherical surface having an arc-shaped cross section provided on an object to be measured. A measuring head having a diameter smaller than that of the concave spherical surface of the object to be measured and having a shape substantially similar to the concave spherical surface is disposed at a constant interval with respect to the concave spherical surface, and provided on the measuring head. Detecting the maximum inner sphere diameter of the concave spherical surface by injecting a measurement compressed fluid from the pair of first nozzles to the diameter portion of the concave spherical surface, and detecting the maximum inner sphere diameter at the position where the maximum inner sphere diameter is detected. While maintaining the measuring head, the diameter of the inner sphere on the entrance side of the concave spherical surface is measured through a pair of second nozzles provided on the measuring head, and a pair of second spheres provided on the measuring head are measured. Measuring the diameter of the inner sphere of the concave spherical surface via three nozzles. And wherein the door.

When the compressed fluid for measurement is jetted from the first to third nozzles, the object to be measured and the measurement head are relatively rotated to form the concave spherical surface at an arbitrary phase angle position. It is preferable to measure the inner sphere diameter.

Further, the present invention relates to an inner sphere diameter measuring device for measuring the inner sphere diameter of a concave spherical surface having an arc-shaped cross section provided on an object to be measured, wherein the inner sphere diameter is smaller than the concave spherical surface of the object to be measured. And a measuring head substantially similar in shape to the concave spherical surface, the measuring head comprising: a pair of first nozzles for injecting a measurement compressed fluid to a diameter portion of the concave spherical surface; and an inlet side of the concave spherical surface. A pair of second jets for injecting the measurement compressed fluid to the concave spherical portion
A nozzle, and a pair of third nozzles for injecting a compressed fluid for measurement to an inner concave spherical portion of the concave spherical surface, and the first to third nozzles are respectively provided via different passages. It is characterized by being connected to a pressure detector.

It is preferable that the first to third nozzles are arranged so as to have a phase difference with respect to the axial direction and the diametrical direction of the measuring head, respectively.

[0012]

In the method and apparatus for measuring the inner sphere diameter according to the present invention, after the maximum inner sphere diameter of the concave spherical surface is detected through the pair of first nozzles provided in the measuring head, the inner sphere diameter is set at that position. The diameter of the inner sphere on the entrance side and the diameter of the inner sphere on the inner side of the concave spherical surface are measured via the pair of second nozzles and the pair of third nozzles while maintaining the measuring head. For this reason, the measuring head can be accurately positioned and held in the concave spherical surface, and the measuring operation of the entrance inner sphere diameter and the inner inner sphere diameter of the concave spherical surface can be performed without tilting the measuring head. It becomes possible. As a result, the operation can be simplified all at once, the measurement operation can be performed quickly and easily, and the measurement failure can be effectively prevented.

When the measurement fluid is ejected from the first to third nozzles, the object to be measured and the measurement head are relatively rotated to adjust the inner spherical diameter of the concave spherical surface at an arbitrary phase angle position. The measurement further improves the measurement accuracy of the inner sphere diameter.

Furthermore, when the first to third nozzles are arranged with a phase difference in the axial direction and the diametrical direction of the measuring head, respectively, the interference of the compressed fluid to be ejected is reliably prevented. can do.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An inner sphere diameter measuring method and apparatus according to the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates an inner sphere diameter measuring apparatus according to the present embodiment. This inner sphere diameter measuring device 10
Is a first pressure detector communicating with a measurement head 12, a support rod 14 to which the head 12 is fixed, and a first passage 16a, a second passage 16b, and a third passage 16c formed in the support rod 14. Device 18a, a second pressure detector 18b, and a third pressure detector 18c.

The head 12 has a diameter smaller than that of the concave spherical surface F of the object W to be measured and has a substantially similar shape to the concave spherical surface F. As shown in FIG. (Corresponds to G)
A pair of first nozzles 20 for injecting a compressed fluid for measurement
a, 20b and a pair of second nozzles 22a for injecting a compressed fluid for measurement onto the inlet-side concave spherical portion Fe of the concave spherical surface F,
22b and a pair of third nozzles 24a, 24b for injecting the compressed fluid for measurement onto the inner concave spherical surface portion Fi of the concave spherical surface F.
And The concave spherical surface F is not a perfect circle.
a, 20b and the distance C1 between the diameter portion and the second nozzle 22
a distance C2 between the a and 22b and the entrance-side concave spherical surface portion Fe;
Distance C between nozzles 24a and 24b and inner concave spherical surface portion Fi
3 is different from each other.

As shown in FIG. 3, the first nozzle 20a, the second nozzle 22a, and the third nozzle 24a
The first nozzle 20b, the second nozzle 22b, and the third nozzle 24b are arranged on the same line with respect to the axial direction (arrow X direction) of FIG. It is arranged with a phase difference with respect to the X direction) and the diameter direction (the arrow Y direction) perpendicular thereto.

The first nozzles 20a and 20b are
Are integrated with each other in the first passage 16a,
Nozzles 22a, 22b and third nozzles 24a, 24b
Similarly, the second passages 16b are integrated with each other.
And the third passage 16c (see FIG. 1). The first passage 16a to the third passage 16c are provided at equal angular intervals on an imaginary circle concentric with the center of the support rod 14 (see FIG. 5).

Next, the operation of the inner sphere diameter measuring device 10 thus configured will be described in relation to the inner sphere diameter measuring method according to the present embodiment.

The workpiece W is held in a vertical posture as shown in FIG. 1, and the head 12 constituting the inner sphere diameter measuring device 10 is lowered from above the workpiece W to be measured. It is disposed at a constant interval with respect to the concave spherical surface F of the object W. Then, first, a compressed fluid is supplied to the first passage 16 a of the support rod body 14, and a pair of first
The compressed fluid for measurement is jetted from the nozzles 20a and 20b to the diameter portion of the concave spherical surface F. For this reason, the first pressure detector 1
The diameter of the inner sphere of the diameter portion, that is, the center diameter G is measured through 8a, the maximum inner sphere diameter of the diameter portion is detected by changing the position of the head 12 up and down, and the maximum inner sphere diameter is detected. The head 12 is maintained at the set position. Because the concave spherical surface F is not a perfect circle (see FIG. 2), it is necessary to arrange the head 12 at a position corresponding to the maximum inner sphere diameter of the diameter portion.

Next, the inner sphere diameter (inlet side inner sphere diameter) of the inlet-side concave spherical portion Fe is measured via a pair of second nozzles 22a and 22b provided on the head 12, and provided on the head 12 as well. Pair of third nozzles 24a, 24b
The inner spherical diameter of the inner concave spherical surface portion Fi (the inner inner spherical diameter)
Is measured. That is, when the compressed fluid is supplied to the second passage 16b, the compressed fluid branches in the head 12 and is jetted from the second nozzles 22a and 22b to the inlet-side concave spherical portion Fe so that the inner sphere diameter is reduced to the second diameter. 2 Measured by the pressure detector 18b. On the other hand, the compressed fluid supplied to the third passage 16c is supplied from the third nozzles 24a and 24b to the inward concave spherical surface portion Fi.
And its inner sphere diameter is measured by the third pressure detector 18c.

Then, it is determined whether or not each measurement result is within the specified range, and the inner spherical diameter of the concave spherical surface F is detected.

In this case, in this embodiment, after the maximum inner sphere diameter of the concave spherical surface F is detected through the pair of first nozzles 20a and 20b provided in the head 12, the head 12 is maintained at that position. In a state in which the pair of second nozzles 22a,
The inner diameter of the inner sphere and the inner diameter of the inner sphere of the concave spherical surface F are measured via the second nozzle 22b and the pair of third nozzles 24a, 24b. For this reason, it is not necessary to tilt the head 12 unlike the related art, and the measuring operation of the inner diameter of the inner sphere on the entrance side and the inner sphere of the concave spherical surface F can be performed easily and quickly. In addition, it is possible to accurately position the head 12 with respect to the concave spherical surface F, and it is possible to obtain the effect that the entire inner diameter measurement operation of the concave spherical surface F can be performed with high accuracy and efficiency. Further, the inner sphere diameter of the inward concave spherical surface portion Fi (see FIGS. 2 and 5), which cannot be measured conventionally, can be easily measured.

In the present embodiment, the inner sphere diameter of the concave spherical surface F is measured while the head 12 is held so as to face the concave spherical surface F. It is possible to perform measurement at three places by rotating the film intermittently, for example, by 120 °. Thereby, there is obtained an advantage that the measurement accuracy of the inner sphere diameter is further improved.

The first nozzle 20b and the second nozzle 22
b and the third nozzle 24b are arranged with a phase difference with respect to the axial direction (arrow X direction) and the diameter direction (arrow Y direction) of the head 12, respectively. Therefore, when the operation of measuring the inner sphere diameter of the inlet-side concave spherical surface portion Fe and the operation of measuring the inner sphere diameter of the inner-side concave spherical surface portion Fi are performed simultaneously, the second nozzle 22 b
And the third nozzle 24b can effectively prevent the interference of the compressed fluid injected from the third nozzle 24b. For this reason, the first nozzle 20a, the second nozzle 22a, and the third nozzle 24a may be arranged with a phase difference in the axial direction and the diametric direction of the head 12, respectively.

[0027]

According to the inner sphere diameter measuring method and apparatus according to the present invention, the following effects and advantages can be obtained.

After the maximum inner sphere diameter of the concave spherical surface is detected through the pair of first nozzles provided on the measuring head, the pair of second nozzles and the pair of second nozzles are maintained while maintaining the measuring head at that position. Since the inlet-side inner sphere diameter and the inner-side inner sphere diameter of the concave sphere are respectively measured via the third nozzle, the inlet-side inner sphere diameter and the inner sphere diameter of the concave sphere can be measured without tilting the measuring head. It becomes possible to perform the measurement operation of the diameter of the inner sphere. As a result, the operation can be simplified at a stroke, the measurement operation can be performed quickly and easily, and the measurement failure can be effectively prevented.

When the compressed fluid for measurement is ejected from the first to third nozzles, the object to be measured and the measuring head are relatively rotated to adjust the inner spherical diameter of the concave spherical surface at an arbitrary phase angle position. The measurement further improves the measurement accuracy of the inner sphere diameter.

Furthermore, if the first to third nozzles are arranged with a phase difference in the axial direction and the diametric direction of the measuring head, respectively, the interference between the compressed fluids to be ejected is reliably prevented. And measurement errors are reduced as much as possible.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an inner sphere diameter measuring device according to an embodiment of the present invention.

FIG. 2 is an enlarged explanatory view of a head and a concave spherical surface of an object to be measured, which constitute the inner sphere diameter measuring device.

FIG. 3 is a side view of one side of a head constituting the inner sphere diameter measuring device.

FIG. 4 is another side view of a head constituting the inner sphere diameter measuring device.

FIG. 5 is a sectional plan view of a support rod constituting the inner sphere diameter measuring device.

FIG. 6 is a partial cross-sectional explanatory view of an object to be measured.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Inner ball diameter measuring device 12 ... Head 14 ... Support rod body 16a-16c
... passages 18a to 18c ... pressure detectors 20a, 20b, 22a, 22b, 24a, 24b ... nozzle G ... central diameter F ... concave spherical surface Fe ... inlet side concave spherical surface portion Fi ... inner side concave spherical surface portion

Claims (4)

(57) [Claims] 1. An inner sphere diameter measuring method for measuring the inner sphere diameter of a concave spherical surface provided on an object to be measured and having an arcuate cross section, wherein the inner sphere diameter is smaller than that of the concave sphere of the object to be measured. A measurement head having a shape substantially similar to a spherical surface is disposed at a fixed interval with respect to the concave spherical surface, and a pair of first heads provided on the measurement head are provided.
A step of injecting a measurement compressed fluid to a diameter portion of the concave sphere from a nozzle to detect a maximum inner sphere diameter of the concave sphere; and maintaining the measurement head at a position where the maximum inner sphere diameter is detected. In this state, the diameter of the inner sphere on the inlet side of the concave spherical surface is measured through a pair of second nozzles provided on the measuring head, and the diameter is measured through a pair of third nozzles provided on the measuring head. Measuring a diameter of the inner sphere on the inner side of the concave spherical surface. 2. The measuring method according to claim 1, wherein when the compressed fluid for measurement is ejected from the first to third nozzles,
An inner sphere diameter measuring method, wherein the object to be measured and the measuring head are relatively rotated to measure the inner sphere diameter of the concave spherical surface at an arbitrary phase angle position. 3. An inner sphere diameter measuring device for measuring an inner sphere diameter of a concave spherical surface having an arc-shaped cross section provided on an object to be measured, wherein the inner sphere diameter is smaller than the concave spherical surface of the object to be measured and the concave is smaller. A measuring head having a substantially similar shape to a spherical surface, wherein the measuring head has a pair of first nozzles for injecting a measuring compressed fluid to a diameter portion of the concave spherical surface, and a concave spherical portion on an inlet side of the concave spherical surface. A pair of second nozzles for injecting the compressed fluid for measurement, and a pair of third nozzles for injecting the compressed fluid for measurement to the inner concave surface of the concave surface; An inner sphere diameter measuring device, wherein the third nozzle communicates with the pressure detector via different passages. 4. The measuring apparatus according to claim 3, wherein the first to third nozzles are arranged so as to have a phase difference in the axial direction and the diametric direction of the measuring head. Inner diameter measuring device.