JPH05164506A - Measuring instrument for surface roughness of spherical part - Google Patents

Abstract

PURPOSE:To obtain a measuring instrument for surface roughness of a spherical part making it possible to reduce the cost and for an operator to conduct a measuring operation easily as occasion demands, by a simple construction. CONSTITUTION:A support block 12 of which the support surface 14 having a V-shaped section supports the spherical part Sa of a substance S to be measured, a probe 17 which is a detector projecting on the support surface 14 of the support block 12 and coming into contact with the surface of the spherical part Sa of the substance S actuated to rotate, and an amplifying display unit 20 which is connected to the probe 17 electrically and amplifies and displays minute indentations sensed by the probe 17, are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring device for measuring the surface roughness of a spherical surface of an object having a spherical surface.

[0002]

2. Description of the Related Art Conventionally, there is a measuring device for measuring the surface roughness of the spherical surface of an object to be measured as shown in FIGS. 2 and 3, for example.

The measuring apparatus of FIG. 2 supports a spherical body A as an object to be measured on a receiving seat 1 having a curved concave portion formed with the same radius of curvature. The receiving seat 1 is mounted on a supporting portion 3 that is provided so as to project from a part of the apparatus main body 2.

A rotary shaft 4 connected to a drive source such as a drive motor (not shown) is disposed below the support portion 3 with its axial direction oriented in the vertical direction. The rotation center axis S of the rotation shaft 4 needs to match the vertical center axis S of the sphere A.

An upper end of the rotary shaft 4 is integrally provided with a lower end of an arm 5 formed in a substantially L shape. A stylus support portion 6 formed in an inverted L shape is provided at the upper end of the arm 5 so as to project.

Like the arm 5, an L-shaped stylus 7 is provided on the stylus support 6. Stylus 7
The portion of the stylus support 6 that is attached and fixed is pivotally supported here so as to be rotatable in the horizontal direction.

The tip of the stylus 7, which is bent in the horizontal direction, is formed in a sharp shape and contacts the spherical surface of the sphere A supported by the receiving seat 1. The movement of the stylus 7 is electrically connected to the stylus support portion 6, and is amplified by an amplifier (not shown) here.

Therefore, when the drive source rotationally drives the rotary shaft 4, the stylus 7 rotates along with the arm 5 along the circumference of the sphere A, and the sharp tip of the stylus 7 continues to the spherical surface of the sphere A. Contact.

Even if the spherical surface has a slight roughness, the stylus 7 rotates in the horizontal direction, and the change is detected by the stylus support portion 6 as an electric change, and the electric signal is sent to the amplifier. That is, the surface roughness of the spherical portion is measured.

In the measuring apparatus shown in FIG. 3, a linear movement shaft 8 which is movable in the horizontal direction, which is an operating rod of an air cylinder, extends from a spherical body A as an object to be measured supported on the receiving seat 1. Be done. A stylus support portion 10 that supports the stylus 9 is provided at the end of the linear motion shaft 8. The stylus support 10
Is electrically connected to a computer (not shown), and changes the stylus 9 into electrical signals.

Therefore, the linear motion shaft 8 is driven to move the stylus 9
When the needle is driven to move back and forth in the horizontal direction, the tip of the stylus 9 will move to the sphere A.
It contacts along the spherical surface of the and rotates up and down. The rotation data is processed by a computer, the arc is corrected, the components of the waviness are separated, and the surface roughness is displayed or recorded.

[0012]

Such a measuring device has the following drawbacks.

In the measuring device shown in FIG. 2, the stylus 7 must be driven by a rotary drive mechanism having a very small rotational error. Then, so-called centering adjustment is required to make the rotation shaft 4 and the center axis S of the object to be measured A coincide with each other with extremely high accuracy, and the radius of the rotation trajectory of the tip of the stylus 7 is
The radius of the object to be measured A must be perfectly matched, and the work therefor is very troublesome and requires skill.

In the measuring device shown in FIG. 3, since the stylus 9 is driven to move back and forth in the horizontal direction, the stylus 9 moves in an arc in a so-called "lever" state, so that the mutual relationship must be corrected. ..

Since the detected vertical displacement includes a spherical radius component and a waviness component together with the surface roughness, it is necessary to perform arithmetic processing by a computer to separate these extra components. .. Further, a displacement detection mechanism having a wide measurement range and high resolution must be provided, which is extremely expensive both mechanically and systematically.

Items common to the measuring devices shown in FIGS. 2 and 3 are that the measuring is performed while moving the stylus 7 and 9 at a constant speed, and the device itself is of a stationary type. It is that you are. With such a configuration, it takes time to set up, and the operator cannot easily measure at any position at any time.

The present invention has been made by paying attention to the above circumstances, and an object of the present invention is to provide a simple structure, to reduce the cost, and to enable an operator to easily perform a measuring operation as needed. The present invention provides a spherical surface roughness measuring device.

[0018]

In order to achieve the above object, the present invention is provided with a receiving surface having a V-shaped cross section on which a spherical portion of an object to be measured having a spherical portion is placed. By projecting the detector onto the receiving surface of the table and detecting the surface roughness of this spherical portion with respect to the object to be measured which is rotationally biased while pressing the spherical portion toward the bottom of the receiving surface, It is a spherical surface roughness measuring device characterized by electrically connecting an amplification display device and amplifying and displaying fine irregularities on the spherical surface detected by a detector.

[0019]

If the spherical surface of the object to be measured is rotated while sliding on the bottom of the receiving surface, the detector can detect and measure this surface roughness. Therefore, even if the object to be measured is manually rotated, the measurement can be reliably performed, and a special object-to-be-measured drive mechanism or a stylus drive mechanism is unnecessary.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. Reference numeral 11 in the drawing denotes a base, on which the receiving base 12 and the detector 13 are mounted.

The pedestal 12 is composed of a block, and the upper surface of the pedestal 12 is a conical receiving surface 14. That is, the receiving surface 14 has a V-shaped cross section.
A frame-shaped guide plate 15 is attached on the upper surface of the pedestal 12 along the periphery of the opening of the receiving surface 14.

Further, there is a notch 16 in a part of the pedestal 12, and a stylus 17 as a detector is inserted therein. The stylus 17 is formed in an L shape, and its sharp tip projects to the bottom of the receiving surface 14. This protruding direction must be correctly oriented to the center of the spherical surface portion Sa of the object S to be measured whose surface roughness is to be measured.

The detector 13 rotatably supports the terminal portion of the stylus 17 and adjusts the adjusting screw 18 to adjust the protrusion amount of the stylus 17 and its inclination angle (not shown). It has a support mechanism. Furthermore, the detector 13 electrically converts a slight rotational change of the stylus 17,
The signal is sent to the amplification display device 20 electrically connected to the device.

The amplification display device 20 includes an amplifier 21 and
The recording unit 22 and the recording unit 22 amplify the signal received from the detector 13 by the amplifier 21 and display the change in the display unit 21a.
, And the recording device 22 records on the recording paper 22a. Then, the adjusting screw 18 of the detector 13 is adjusted to correctly set the inclination and position of the probe 17 so that the tip of the probe 17 faces the center of the spherical surface Sa.

When these preparations are completed, the spherical portion Sa, which is the tip of the object to be measured S, is brought into contact with the bottom of the receiving surface 14 and the portion above the spherical portion Sa is brought into contact with one surface of the receiving surface 14. Tilt to touch. Here, the measured object S has, for example, a round bar shape, and a hemispherical spherical surface portion Sa is formed only at the tip.

In this state, the tip of the stylus 17 has a spherical surface portion Sa.
Touch a part of. The operator grasps the upper part of the object to be measured S and presses the spherical surface portion Sa so as not to separate from the bottommost portion of the receiving surface 14, while holding the receiving surface 14 facing 180 °.
Rotate in the direction of the arrow (a) until it abuts on the other surface.

The spherical surface portion Sa is displaced while sliding along the bottommost portion of the receiving surface 14, and the contact position with the stylus 17 changes. When the spherical surface portion Sa has surface roughness, the stylus 17 is rotationally displaced, and the detector 13 converts the change into an electric signal and sends it to the amplification display device 20. In the display section 21a of the amplifier 21,
The surface roughness value is continuously displayed, and the recorder 22 amplifies the change and records it on the recording paper 22a.

When the object S to be measured is rotated from the inclined surface of the receiving surface 14 to the angle θ at which it comes into contact with the opposed inclined surface, the surface roughness Sa of one longitude (or latitude) of the surface portion Sa can be obtained. The measurement ends. If necessary, after rotating the DUT S by a predetermined angle, the above-mentioned work is repeated again,
The surface roughness of the longitude (or latitude) can be measured.

In this way, the measured object S is manually pressed against the reference receiving surface 14, and the measured object S is manually rotated to measure the surface roughness.
The surface roughness of can be measured.

Since the surface to be measured serves as a reference at the time of measurement, stable measurement can be performed even manually. Like traditional
This eliminates the need for highly accurate machining and assembly, complicated computer processing, etc., contributing to cost reduction of the device.

As the shape structure of the object S to be measured, the spherical portion S having a round bar shape and a semicircular tip as described above.
Not only the object to be measured including a, but also various spherical angles can be measured, and naturally, the surface roughness of a sphere can also be measured.

If the receiving surface 14 of the pedestal 12 is not a conical shape but a V groove type such as an ordinary V block, even if the object to be measured is a plate having a spherical cross section. It is measurable. The attachment position of the stylus 17 is not limited to the bottom portion of the receiving surface 14, but may be attached to a lateral portion or the like depending on the purpose of use.

As the detector, not only the stylus 17 for contacting and detecting the object to be measured S, but also an optical sensor for detecting in contact with the object to be measured may be used. That is,
Instead of the stylus 17 and the detector 13, an optical sensor is attached to the pedestal 12 to irradiate the spherical surface with the detection light and send it to the amplification display device as an electric signal.

The amplification display device converts the detected fine surface roughness into an electric quantity and further amplifies and displays it as the roughness quantity. However, the present invention is not limited to this, and the converted electric quantity is directly displayed on the meter. It may be displayed on the screen. In addition, various modifications can be made within the scope of the present invention.

[0035]

As described above, the present invention is an apparatus having a simple structure, and has an effect that it is possible to measure the surface roughness of the spherical surface portion with high accuracy by a simple operation.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a spherical surface roughness measuring apparatus showing an embodiment of the present invention.

FIG. 2 is a configuration diagram of a main part of a spherical surface roughness measuring device of a conventional example.

FIG. 3 is a configuration diagram of a main part of a surface roughness measuring device of a spherical surface portion of another conventional example.

[Explanation of symbols]

Sa ... spherical part, S ... object to be measured, 14 ... receiving surface, 12 ... pedestal, 17 ... stylus, 20 ... amplification indicator.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroshi Inoue 2-4 Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Toshiba Keihin Office

Claims (1)

[Claims] 1. A pedestal having a receiving surface having a V-shaped cross section, on which a spherical surface portion of an object to be measured having a spherical surface portion is mounted, and a spherical surface portion protruding toward the receiving surface of the pedestal and extending toward the bottom of the receiving surface. A detector that detects the surface roughness of this spherical surface with respect to the measured object that is rotationally biased while pressing, and the unevenness of the spherical surface that is electrically connected to this detector and detected by the detector is amplified. A surface roughness measuring device for spherical surface, comprising: