JPH07113627A - Method and equipment for measuring diameter of internal sphere - Google Patents

Abstract

PURPOSE:To measure the diameter of the internal sphere of a recessed spherical surface having an arcuate cross section mounted on an article to be measured simply with high accuracy. CONSTITUTION:A head 12 for measurement having a diameter smaller than the recessed spherical surface F of an article to be measured W and an approximately similar figure to the recessed spherical surface F is provided, and the head 12 has a pair of first nozzles 20a, 20b injecting a compressive fluid for measurement against the diametral section of the recessed spherical surface F, a pair of second nozzles 22a, 22b infecting the compressive fluid for measurement against the inlet-side recessed spherical surface section Fe of the recessed spherical surface F and a pair of third nozzles 24a, 24b injecting the compressive fluid for measurement against the inside recessed spherical surface section of the recessed spherical surface F.

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 having an arcuate cross section provided on an object to be measured.

[0002]

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

This type of air micrometer is provided with a plug gauge (measuring head) having a cylindrical outer peripheral surface as a probe, and a pair of nozzles are provided at the tip of this plug gauge so as to face the outer peripheral surface. Has been. Then, when measuring the inner diameter dimension with the air micrometer, after the plug gauge tip portion is disposed corresponding to the inner diameter surface of the inner ring of the object to be measured, compressed fluid from the pair of nozzles to the inner diameter surface. The float in the taper pipe of the air micrometer display is jetted and floats up due to the back pressure. Therefore, the inner diameter of the inner ring of the object to be measured is measured by reading the display of the float position.

By the way, as shown in FIG. 6, when the inner spherical diameter of a concave spherical surface F having an arcuate cross section provided on an object to be measured W, which is an outboard outer of a constant velocity joint, is measured, first of all, A plug gauge tip portion having a smaller diameter and a similar shape is arranged corresponding to the concave spherical surface F. Then, after the inner diameter (center diameter) of the diameter portion of the concave spherical surface F is measured through a pair of nozzles provided at the tip of the plug gauge, the tip of the plug gauge is tilted by a predetermined angle and one of the nozzles is The nozzle is arranged near the inlet side end of the concave spherical surface F, and the other nozzle is arranged toward 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 end portion 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 of the concave spherical surface F and the diagonal diameters H1 and H2.

[0006]

However, in the above-mentioned prior art, when measuring the inner sphere diameter, each nozzle provided in the diametrical direction of the tip portion of the plug gauge has a concave spherical surface F.
Must be facing. This is because if one of the nozzles deviates from the concave spherical surface F, the compressed fluid ejected from this one nozzle will flow out to the outside, making it impossible to measure the inner diameter of the concave spherical surface F. Therefore, in the conventional air micrometer, the measurable range α ° and the unmeasurable range β ° exist on the concave spherical surface F. However, if the inner sphere diameter in this unmeasurable range β ° is not sufficiently controlled, problems such as fluctuations in torque after assembly occur, and therefore the entire concave spherical surface F can be easily and accurately controlled. Is desired.

The present invention is for solving this kind of problem, and it is possible to measure the inner spherical diameter of a concave spherical surface having an arcuate cross section provided on the object to be measured easily and with high accuracy. An object is to provide a method and an apparatus for measuring the inner diameter.

[0008]

In order 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 arcuate 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 that of the concave spherical surface is provided at a constant interval with respect to the concave spherical surface, and is provided on the measuring head. Detecting a maximum inner spherical 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 at the position where the maximum inner spherical diameter is detected. While maintaining the measurement head, the inner spherical diameter on the inlet side of the concave spherical surface is measured through a pair of second nozzles provided on the measurement head, and a pair of first nozzles provided on the measurement head are measured. Measuring the inner spherical diameter of the concave spherical surface through three nozzles. And wherein the door.

Further, when jetting the measurement compressed fluid from the first to third nozzles, the object to be measured and the measurement head are relatively rotated to move the concave spherical surface at an arbitrary phase angle position. It is preferable to measure the inner spherical diameter.

Furthermore, the present invention is an inner sphere diameter measuring device for measuring the inner sphere diameter of a concave spherical surface having an arcuate cross section provided on a measured object, the diameter being smaller than the concave spherical surface of the measured object. And a measurement head having a shape similar to that of the concave spherical surface, wherein the measurement head includes 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 surface portion
The nozzle has a nozzle and a pair of third nozzles for injecting a measurement compressed fluid toward the concave spherical surface portion on the inner side of the concave spherical surface, and the first nozzle to the third nozzle are respectively passed through different passages. It is characterized in that it communicates with a pressure detector.

Further, it is preferable that the first to third nozzles are arranged with a phase difference in the axial direction and the diametrical direction of the measuring head, respectively.

[0012]

In the above-described inner sphere diameter measuring method and apparatus according to the present invention, the maximum inner sphere diameter of the concave spherical surface is detected through the pair of first nozzles provided in the measuring head, and then the position is measured at the position. The inlet-side inner sphere diameter and the inner-side inner sphere diameter of the concave spherical surface are measured through the pair of second nozzles and the pair of third nozzles while maintaining the measuring head. Therefore, the measuring head can be accurately positioned and held in the concave spherical surface, and the measurement work of the inner spherical diameter on the inlet side and the inner spherical diameter of the concave spherical surface can be performed without tilting the measuring head. It will be possible. As a result, the operation is simplified at once, the measurement work is performed quickly and easily, and the measurement failure can be effectively prevented.

Further, when the measurement compressed fluid is ejected from the first to third nozzles, the object to be measured and the measurement head are relatively rotated to set the inner spherical diameter of the concave spherical surface at an arbitrary phase angle position. If it is measured, the measurement accuracy of the inner spherical diameter is further improved.

Furthermore, when 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, the interference of the jetted compressed fluids is reliably prevented. can do.

[0015]

Embodiments of the method and apparatus for measuring the inner spherical diameter 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 this embodiment. This inner diameter measuring device 10
Is the first pressure detection communicating with the measurement head 12, the support rod 14 that fixes the head 12, and the first passage 16a, the second passage 16b, and the third passage 16c formed in the support rod 14. And 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 to be measured W and has a shape substantially similar to the concave spherical surface F. As shown in FIG. (Compatible with G)
To the pair of first nozzles 20 for injecting the measurement compressed fluid
a, 20b and a pair of second nozzles 22a for injecting a measurement compressed fluid onto the concave spherical surface portion Fe on the inlet side of the concave spherical surface F,
22b and a pair of third nozzles 24a, 24b for injecting the measurement compressed fluid onto the concave spherical surface portion Fi on the inner side of the concave spherical surface F.
With. The concave spherical surface F is not a perfect circle, but the first nozzle 20
a, 20b and the distance C1 between the diameter portion and the second nozzle 22
a, 22b and the distance C2 between the concave spherical surface Fe on the inlet side,
Distance C between nozzles 24a, 24b and inward concave spherical surface portion Fi
3 is different from each.

As shown in FIG. 3, the first nozzle 20a, the second nozzle 22a and the third nozzle 24a are connected to the head 12
Of 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 the head 12, as shown in FIG. They are arranged with a phase difference in the X direction) and the diametrical direction (arrow Y direction) orthogonal thereto.

The first nozzles 20a and 20b are the head 12
Are integrated with each other and communicate with the first passage 16a,
Nozzles 22a, 22b and third nozzles 24a, 24b
Similarly, the second passages 16b are integrally formed with each other.
And communicates with the third passage 16c (see FIG. 1). The first passage 16a to the third passage 16c are provided at equal angular intervals on a virtual circumference concentric with the center of the support rod 14 (see FIG. 5).

Next, the operation of the inner sphere diameter measuring apparatus 10 thus constructed will be described in relation to the inner sphere diameter measuring method according to this embodiment.

The object to be measured W is held in a vertical posture as shown in FIG. 1, and the head 12 constituting the inner diameter measuring device 10 is lowered from above the object to be measured W to be measured. It is arranged at a constant distance from the concave spherical surface F of the object W. Then, first, the compressed fluid is supplied to the first passage 16 a of the support rod body 14 to provide a pair of first
The measurement compressed fluid is jetted from the nozzles 20a and 20b to the diameter portion of the concave spherical surface F. Therefore, the first pressure detector 1
The inner sphere diameter of the diameter portion, that is, the central diameter G is measured via 8a, and the maximum inner sphere diameter of the diameter portion is detected by changing the position of the head 12 up and down. The head 12 is maintained at the set position. This is because the concave spherical surface F is not a perfect circle (see FIG. 2), and the head 12 needs to be arranged at a position corresponding to the maximum inner spherical diameter of the diameter portion.

Next, the inner spherical diameter of the concave spherical surface Fe on the inlet side (inner spherical diameter on the inlet side) is measured through a pair of second nozzles 22a and 22b provided on the head 12, and the head 12 is provided with the inner spherical diameter. Paired third nozzles 24a, 24b
Through the inner concave spherical surface portion Fi (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 ejected from the second nozzles 22a and 22b to the inlet-side concave spherical surface portion Fe so that the inner spherical diameter thereof is the first. 2 Measured by the pressure detector 18b. On the other hand, the compressed fluid supplied to the third passage 16c passes from the third nozzles 24a and 24b to the inward concave spherical surface portion Fi.
And the inner diameter thereof is measured by the third pressure detector 18c.

Therefore, it is judged 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 spherical diameter of the concave spherical surface F is detected via the pair of first nozzles 20a, 20b provided on the head 12, the head 12 is maintained at that position. The pair of second nozzles 22a,
The inner diameter of the concave spherical surface F on the inlet side and the inner diameter of the concave side F are measured via 22b and the pair of third nozzles 24a and 24b. Therefore, it is not necessary to tilt the head 12 as in the conventional case, and the work of measuring the inner diameter of the concave spherical surface F on the inlet side and the inner diameter of the inner side can be performed easily and quickly. Moreover, 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 measuring operation of the inner spherical diameter of the concave spherical surface F can be performed with high accuracy and efficiency. Further, it is possible to easily measure the inner spherical diameter of the inward concave spherical surface portion Fi (see FIGS. 2 and 5), which was conventionally impossible to measure.

In this embodiment, the inner spherical diameter of the concave spherical surface F is measured while the head 12 is held facing the concave spherical surface F. However, the head 12 or the object to be measured W is measured at a predetermined angle. It is possible to intermittently rotate each of them, for example, rotate each of 120 ° to perform measurement at three points. Thereby, there is an advantage that the measurement accuracy of the inner sphere diameter is further improved.

Further, 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 work of measuring the inner sphere diameter of the inlet-side concave spherical surface portion Fe and the work of measuring the inner sphere diameter of the inner-side concave spherical surface portion Fi are simultaneously performed, the second nozzle 22b
And the interference of the compressed fluid ejected from the third nozzle 24b can be effectively prevented. Therefore, 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 diametrical direction of the head 12, respectively.

[0027]

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

After the maximum inner spherical 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 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 spherical surface are measured via the third nozzle, respectively, the inlet-side inner sphere diameter and the inner side spherical diameter of the concave spherical surface can be measured without tilting the measuring head. It becomes possible to perform the work of measuring the inner spherical diameter. As a result, the operation can be simplified at once, the measurement work can be performed quickly and easily, and the measurement failure can be effectively prevented.

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

Furthermore, when 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, it is possible to reliably prevent interference between the jetted compressed fluids. The measurement error can be reduced as much as possible.

[Brief description of drawings]

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

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

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

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

FIG. 5 is a cross-sectional plan view of a support rod that constitutes 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 sphere diameter measuring device 12 ... Head 14 ... Support rod 16a-16c
... passages 18a to 18c ... pressure detectors 20a, 20b, 22a, 22b, 24a, 24b ... nozzle G ... central diameter F ... concave spherical surface Fe ... inlet concave spherical surface portion Fi ... inward concave spherical surface portion

Claims (4)

[Claims] 1. An inner sphere diameter measuring method for measuring an inner sphere diameter of a concave spherical surface having an arcuate cross section provided on an object to be measured, the inner sphere diameter being smaller than that of the concave spherical surface of the object to be measured. A measuring head having a shape similar to that of a spherical surface is arranged at a constant interval with respect to the concave spherical surface, and a pair of first heads is provided on the measuring head.
A step of ejecting a measurement compressed fluid from a nozzle onto the diameter portion of the concave spherical surface to detect the maximum inner spherical diameter of the concave spherical surface; and maintaining the measuring head at the position where the maximum inner spherical diameter is detected. In this state, the inner diameter of the concave spherical surface on the inlet side is measured through a pair of second nozzles provided in the measurement head, and the measurement is performed through a pair of third nozzles provided in the measurement head. An inner sphere diameter measuring method comprising: a step of measuring an inner sphere diameter on an inner side of a concave spherical surface. 2. The measuring method according to claim 1, wherein when the measurement compressed fluid is jetted from the first to third nozzles,
An inner sphere diameter measuring method, characterized in that 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 spherical diameter measuring device for measuring an inner spherical diameter of a concave spherical surface having an arcuate cross section provided on an object to be measured, the inner spherical diameter being smaller than the concave spherical surface of the object to be measured. A measuring head having a shape similar to that of a spherical surface is provided, wherein the measuring head has a pair of first nozzles for injecting a measurement compressed fluid to a diameter portion of the concave spherical surface, and an inlet side concave spherical surface portion of the concave spherical surface. A pair of second nozzles for ejecting the measurement compressed fluid, and a pair of third nozzles for ejecting the measurement compressed fluid to the inner concave spherical surface of the concave spherical surface, and the first nozzle to The inner diameter measuring device is characterized in that the third nozzle communicates with the pressure detector through different passages. 4. The measuring device according to claim 3, wherein the first to third nozzles are arranged with a phase difference with respect to the axial direction and the diametrical direction of the measuring head, respectively. Inner sphere diameter measuring device.