JPH0194202A - Measuring apparatus - Google Patents

Abstract

PURPOSE:To enable accurate measurement of the geometry of an interface between a cast skin surface and a ground surface, by rotating a disc-shaped object having a flange to detect the position of a circumferential end sectioned by a ground circumferential surface and a cast skin end face with a magnetic type distance sensor. CONSTITUTION:A disc rotor 100 as disc-shaped object is placed on a ball 13 of a bearing section 12 of an inspection base 1 and receiving a pulse signal of a microcomputer 62, a motor 21 of a driver 2 rotates with an end face 23 of a rotary device 22 pressed on an end face 103 of a boss section 102. Then, a magnetic type distance sensor 3 detects a relative distance between a circumferential end 110 and a sensor 3, a magnetic type distance sensor 4 detects a relative distance between a circumference end 111 and the sensor 4 and a touch sensor 5 gets in slide contact with a ground circumferential surface 107 of a flange section 101 to detect a relative distance therebetween. Then, an input circuit section 61 processes signals from the sensors 3-5 to synthesize a digital signal which is transmitted to the microcomputer 62. Thus, the microcomputer 62 processes an input signal and can output a discrimination signal indicating the propriety of the thickness or the deflection of a cooling fin section 105 of the disc rotor 100.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a measuring device for measuring the shape of the boundary between a polished surface and a cast surface of a disc-shaped article having a polished surface and a cast surface. The measuring device of the present invention is used, for example, to inspect the shape of automobile disc rotors.

[Prior Art] FIG. 2 shows a partial front view of a flange portion of a disc rotor conventionally used as a component of a braking device of an automobile. The thickness D of the cooling fin portion 105 of the flange portion 101 of this disc rotor was visually inspected after completing a predetermined processing step.

The disc rotor shown in FIG. 2 is an iron block having a boss (not shown) and a flange 101 integrated with the boss. The flange portion 101 has a cooling fin portion 105 formed in the center thereof, and a cooling fin portion 1 formed at the center thereof.
The first disk portion 12 is integrally formed so as to sandwich 05.
0 and a second disk portion 130.

The outer peripheral surfaces 1.06.107 of the first disc part 120 and the second disc part 130 are polished surfaces, and the cooling fin part 10
The outer peripheral surface 108 of No. 5 remains a cast surface. Furthermore, the outer circumferential end 11 of the outer circumferential surface 106, 107 on the side of the cooling fin portion 105
0.111 is one end surface 116.11 which is a cast surface surface, respectively.
It is divided by 7.

[Problems to be solved by the invention] However, the visual inspection work imposes a considerable mental burden on the worker, and it is desirable to automate the inspection process in order to improve the reliability and efficiency of the inspection. It was rare.

However, when automating the inspection of the thickness D of the cooling fin portion 105, it is necessary to measure the distance between the outer circumferential ends 110 and 111, for example, but one end surface 116.1, which is a cast surface,
The outer peripheral ends 110 and 111 in contact with the outer peripheral ends 110 and 111 have minute irregularities, and noise due to the minute irregularities is mixed into the output of a position sensor that detects the position of the outer peripheral ends 110 and 111. Therefore,
Outer peripheral end 110.11 according to the output signal of the position sensor
It was difficult to accurately determine the position of the cooling fin portion 105 and also to accurately detect the thickness D of the cooling fin portion 105 due to the difference between the two.

Furthermore, this problem is not limited to the above-mentioned case, and has always been a problem when automatically measuring the boundary position between the cast surface and the polished surface of a cast product.

The present invention has been made in view of the above-mentioned problems, and despite the unevenness of the cast surface of a disc-shaped article, the boundary between the cast surface and the polished surface (i.e., the edge of the polished surface in contact with the cast surface) It is an object of the present invention to provide a measuring device that can more accurately measure the position or shape of a part).

[Means for Solving the Problems] The measuring device of the present invention provides a disc-shaped article having a flange portion, an outer circumferential surface of the flange portion being a polished surface, and one end surface defining the outer circumferential surface being a cast surface. In the apparatus for measuring the outer peripheral end shape of the one end face side having the cast surface of the flange portion, an inspection table rotatably supporting the disc-shaped article around the axis of rotation, and an inspection table held on the inspection table. The device is configured to include a drive device that rotates the disc-shaped article, and a magnetic distance sensor provided close to the outer peripheral end of the flange portion.

The disk-shaped article is a workpiece that has at least a flange portion, and the outer circumferential surface of the flange portion is a polished surface that is in contact with a cast surface at at least one end, and is preferably a highly magnetically permeable metal member.

The inspection table may be any base that supports the disc-shaped article rotatably about the axis of the disc-shaped article as the center of rotation. For example, it is a base having an abutment surface that slidably holds a disc-shaped article. However, the contact surface is preferably smooth and wear-resistant, and is preferably made of ceramic material. Alternatively, a plurality of ball bearings may be installed on the inspection table, and the disc-shaped article may be rotatably mounted on the ball bearings. In this case, a virtual contact surface including a contact point between the ball of the ball bearing and the disk-shaped article becomes the contact surface of the inspection table. Furthermore, the inspection table itself has a rotating part that holds and rotates the disc-shaped article.
- It is also possible. In this case as well, a predetermined surface of the rotating part, for example, a contact surface with the disc-shaped article becomes the contact surface of the inspection table.

−5= The drive device is a device that rotates the disc-shaped article.

Any magnetic distance sensor may be used as long as it can electromagnetically detect the position of the object to be measured.

In a magnetic distance sensor using an AC coil, changes in the position of the highly permeable casting and the position of the conductive casting can be detected as changes in the impedance of the AC coil.

[Function] In the measuring device of the present invention, the drive device rotates a disc-shaped article having a flange portion, and the magnetic distance sensor is defined by the polished LC outer peripheral surface of the flange portion and one end surface that is a cast surface. Detect the position of the outer peripheral edge.

“Example” An example of the measuring device of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram of the measuring device of this embodiment, FIG. 2 is a schematic diagram of a partially enlarged area of FIG. 1, and FIG. It is.

The measuring device of this embodiment includes an inspection table 1 that rotatably supports a disk rotor 100, which is a disk-shaped article, rotatably about its axis X, a drive device 2 that rotates the disk rotor 100, and a disk rotor 100. It consists of two magnetic distance sensors 3.4 and a touch sensor 5 that are provided in close proximity to each other, and a control section 6 that processes the output signals of the magnetic distance sensor 3.4 and the touch sensor 5.

The disc rotor 100 is a hat-shaped iron casting having a flange portion 101 and a boss portion 102 concentrically integrated, and has high magnetic permeability. The disc rotor 100 also includes a polished one end surface 103 of the boss portion 102 and a flange portion 10.
1 and one polished end surface 104. Flange part 10
1 has a cooling fin section 105 formed in the center thereof, and a first disk section 120 and a second disk section 130 that are integrally formed so as to sandwich the cooling fin section 105 therebetween. The outer circumferential surfaces 106 and 107 of the first disk section 120 and the second disk section 130 are polished surfaces, and the outer circumferential surface 108 of the cooling fin section 105 is a cast surface.

Furthermore, the outer circumferential ends 110 and 111 of the outer circumferential surfaces 106 and 107 on the cooling fin portion 105 side are each partitioned by one end surface 116 and 117 that is a cast surface. Cooling fin part 1
05 is a large number of grooves (not shown) opened in the radial direction;
It is configured by alternately arranging a large number of cooling fins (not shown) that partition the adjacent grooves and extend in the radial direction. Further, the flange portion 101 is larger in the radial direction than the cooling fins (not shown) of the cooling fin portion 105.

The inspection table 1 has four ball bearings 12 (first
Only three are shown in the figure. ), and each ball bearing part 12 is a rolling bearing unit that extends in the direction of the axis X and rotatably holds a ball 13 at its tip.

These balls 13 rotatably support the end surface 104 of the disc rotor 100.

The drive device 2 includes a motor lifting device (not shown) fixed to the examination table 1, a motor 21 held by the motor lifting device so as to be movable up and down in the direction of the axis X, and a rotating shaft of the motor 21 (not shown). A flange-shaped rotary tool 2 fixed to (not shown)
It consists of 2 and. The motor lifting device (not shown) is, for example, a rack-and-binion device, and is controlled by a microcomputer 62, which will be described later, to move the motor 21 up and down in the direction of the axis X. The motor 21 is controlled by a microcomputer 62, which will be explained later, to rotate the rotary tool 22. The rotating tool 22 has a flange shape, and one end surface 23 thereof is in pressure contact with one end surface 103 of the boss portion 102 of the disc rotor 100.

The magnetic distance sensor 3 is held on the inspection table 1 so as to be close to the outer circumferential end 110 that is the boundary between the polished outer circumferential surface 106 of the flange portion 101 of the disk rotor 100 and one end surface 116 extending in the radial direction. ing.

Similarly, magnetic distance IIItI? The surface 4 is a polished outer peripheral surface 10 of the flange portion 101 of the disc rotor 100.
It is held on the inspection table 1 so as to be close to the outer circumferential end 111, which is the boundary between 7 and one end surface 117 extending in the radial direction.

The touch sensor 5 has a contact 51 and is fixed to the examination table 1. The tip of this contactor 51 is in contact with the polished outer peripheral surface 107 of the flange portion 101. Note that as the touch sensor 5, a strain gauge type one is used here.

The control unit 6 includes an input circuit unit 61 that converts the output signals of the magnetic distance sensors 4 and 4, the touch sensor 5, etc. into digital signals, and a control unit 6 that receives the digital signals outputted from the input circuit unit 61 and then converts them into digital signals. It consists of a microcomputer 62 that outputs various control signals as described in . Input circuit section 61
includes three sense amplifiers (not shown) that amplify the output signals of the magnetic distance sensor 3.4 and the touch sensor 32 to predetermined sizes, and A/D converter for each of the output signals of the sense amplifiers. It consists of three A/D converters (not shown). The microcomputer 62 is the input circuit section 6
1, etc., outputs a determination signal for determining the quality of the disc rotor 100 to output signal lines 63 and 64, and outputs a control signal for controlling the motor 21 to an output signal line 65.

The basic operation of this measuring device will first be explained below, and then its detailed operation will be explained based on the flowchart of FIG. Note that this measuring device is for inspecting the thickness of the cooling fin portion 105 in the direction parallel to the axis X, which is specified by the distance between the outer peripheral end 110 and the outer peripheral end 111 of the flange portion 101.

First, before the inspection, the motor lifting device (not shown) moves the motor 21 away from the inspection table 1.

One end surface 104 of the disc rotor 100 and the ball 1
3 of the bearing part 12 of the examination table 1 so that the balls 1 and 3 are in contact with each other.
3, place the disc rotor 100 on top of the motor lift device (not shown) so that the axis X of the disc rotor 100 and the axis (not shown) of the motor 21 match.
The motor 21 is lowered to approach the inspection table 1, and the one end surface 23 of the rotary tool 22 is pressed against the one end surface 103 of the boss portion 102.

Next, the microcomputer 62 supplies a pulse signal to the motor 21 to rotate the motor 21. The motor 21 rotates the disc rotor 100 through frictional coupling between the rotating tool 22 and the disc rotor 100.

The ball 13 rotatably holds the disc rotor IQO. As shown in FIG. 2, the magnetic distance sensor 3 is close to the outer edge 110, detects the relative distance between the outer edge 110 and the magnetic distance sensor 3, and sends the obtained signal to the input circuit section 61. .

Similarly, the magnetic distance sensor 4 is close to the outer peripheral end 11 and detects the relative distance between the outer peripheral end 111 and the magnetic distance sensor 4, and sends the obtained signal to the input circuit section 61. The touch sensor 5 is in sliding contact with the polished outer circumferential surface 107 of the flange portion 101, detects the relative distance between the touch sensor 5 and the polished outer circumferential surface 107, and sends the obtained signal to the input circuit section 61. The input circuit section 61 inputs signals obtained from the magnetic distance sensors 3 and 4 and the touch sensor 5 to the built-in sense amplifier (not shown) and the built-in A/D converter (not shown).
(not shown) to synthesize digital signals, and transmit these digital signals to the microcomputer 62. The microcomputer 62 controls the motor 21 and processes the input digital signal to determine whether the disc rotor is good or bad.

A more detailed operation of the microcomputer 62 will be explained with reference to the flowchart of FIG.

First, when a start switch (not shown) is turned on, the routine is started and the process advances to 8101.

At $101, initialize registers, memory, etc.
Proceed to 5102.

In 5102, the microcomputer 62 sends a drive signal to the motor 21 to rotate the motor 21, and after one second when the rotation of the motor 21 becomes stable, the process proceeds to 8103. In addition, the motor 21
is rotated at 1 rps.

At 5103, the signal A of the magnetic distance sensor 3, the signal B of the magnetic distance sensor, and the signal C of the touch sensor 5 sent from the input circuit section 61 are stored in the memory of the microcomputer 62 (
(not shown) and proceed to step 418104. Note that each signal A, B, and C stored in the memory at 5103 is
This is measurement data of each measurement point sampled at the same time by an A/D converter.

In 5104, the number of sampling times N of the signal A is set to 1, and the process proceeds to 5105. Of course, the number of times signal A is sampled is equal to the number of times signal B is sampled and the number of times signal C is sampled.

At 5105, it is determined whether the sampling number N of signal A has reached 35, and if so, the process proceeds to $106. If not, the process returns to 8103 after approximately 1 msec has elapsed using a built-in timer (not shown). return.

Then, in 8103, each signal A, B1C is stored in a memory (not shown), and in 5104, the number of samplings N is set to 2, and the process proceeds to 8105. In 5105, the built-in timer is set so that N becomes 35 one second after the start. Therefore, in this embodiment, the disc rotor 10
0 rotation, the memory sequentially stores each of the signals A, B, and C, and when the rotation angle of the disc rotor reaches 3.
When the temperature reaches 60 degrees, the memory stores 35 sets of the signals B
, C.

In 5106, the motor 21 is stopped and the process proceeds to 5107.

5107 processes the 35-phase measurement data obtained from the magnetic distance sensor 3.4 and the Tatsuji sensor 5,
The amount of displacement of the outer peripheral end 110 and the outer peripheral end 111 of the flange portion 101 in a direction parallel to the axis X is calculated.

The details of the measurement data processing in 3107 will be explained below.

Note that the radial displacement of the outer circumferential surfaces 106 and 107, which will be explained later, is based on the motor axis X and the disk rotor 100 axis (
(not shown) is coincident with O.

First, the signal C obtained from the touch lens 5 is processed,
A displacement ΔY of the outer peripheral surface 107 of the flange portion 101 in the direction perpendicular to the axis X (radial direction) is detected.

Next, a correction coefficient K, which will be described later, is determined from a correction body number table stored in advance in accordance with the displacement ΔY. Note that this correction coefficient is calculated by combining the signals A and B obtained from the magnetic distance sensor 3.4 with the signal (
This is a coefficient used when converting into Δ〇-KXA, Bo=KXB (referred to as a reference signal). Next, magnetic distance sensor 3.
The reference signals Δ0 and BO are obtained by multiplying the signals B and C of No. 4 by the correction coefficient K after the correction. This reference signal A
o includes information regarding the displacement of the outer peripheral end 110 in a direction parallel to the axis X (referred to as Ia), and information regarding the unevenness of one end surface (casting surface) 106 near the outer peripheral end 110 (referred to as In). It can be considered as a thing. However, the sensitive area of the magnetic distance lens 3 is relatively large, and the one end surface 10
Since the unevenness of 6 is generally minute, the information Jn can be averaged and considered to be approximately 0.

Therefore, the reference signal Ao can be considered to include only the information Ia regarding the displacement of the outer peripheral end 110 in the direction parallel to the axis X. Therefore, from the reference signal ΔQ, the axis 3
The amount of displacement Δx1 of the outer peripheral end 110 in the direction parallel to is calculated. Note that this displacement amount ΔX is calculated by multiplying the reference signal AO by a correction function stored in advance.

Further, in the same manner as the calculation of the displacement amount Δx1 of the outer circumferential end 110, the displacement amount ΔX2 of the boundary portion 111 in the direction parallel to the axis X is calculated from the reference signal BO of the magnetic distance it series-4. Finally, the difference in the amount of displacement (that is, the thickness of the cooling fin portion) D-8X1-ΔX2 is determined, and the process proceeds to $108.

At 8108, the thickness D of the cooling fin portion 105 and the reference thickness of the cooling fin portion 105 set and stored in advance [)
If the absolute value of the difference l D - Dm l is within a predetermined range that is set and stored in advance, the process proceeds to step 5109; otherwise, the process proceeds to step 5113.

At step 8109, the displacement ΔX1 of the outer peripheral end 110 in the direction parallel to the axis X is compared with a reference displacement ΔX1m set and stored in advance, and the absolute value of the difference 1ΔX1-Δ is determined.
If X1m1 is within a predetermined range that has been set and stored in advance, the process proceeds to 5110; otherwise (if J, the process proceeds to 5113).

At 8110, the displacement amount ΔX2 of the outer peripheral end 111 in the direction parallel to the axis X is compared with a reference displacement amount ΔX2m set and stored in advance, and the absolute value of the difference 1Δx2−Δ is determined.
If X2m1 is within a predetermined range set and stored in advance, the process proceeds to $111; otherwise, the process proceeds to 5113.

Therefore, the thickness D1 displacement distance ΔX1 and the displacement distance ΔX2 determined at $108.5109 and $5110 are information regarding the measured point on the outer peripheral edge, respectively. The displacement amount ΔX1 is used to detect runout at the measured point on the outer circumferential end 110, and the displacement amount ΔX2 is used to detect runout at the measured point on the outer circumferential end 111.

In 5111, information D1△ of the group of points to be measured
The number of times x1 and △x2 were processed (data processing number) M is 1
and proceed to 5112.

In 5112, if the number of data processing times M is 35 or more, the process advances to 5114; otherwise, the process returns to 5107. and 5107.5108.5109.5110,5
The routine consisting of 111.5112 is processed the number of times M
Repeat until you reach 35 times.

At 5114, a determination signal indicating that the thickness or deflection of the cooling fin portion 105 of the disc rotor 100 is good is output from the output signal line 63 and the output signal line 64 to an external display device (not shown). End the routine.

At step 5109, a signal indicating that the thickness or deflection of the cooling fin portion 105 of the disc rotor 100 is defective is output from the output horn signal line 63 and the output signal line 64 to an external display device (not shown), and the routine is executed. finish. In addition,
For example, a CRT display is suitable as the external display device.

Incidentally, as the touch sensor 32, for example, an actuating transformer type or a variable capacitance type can also be used.

Furthermore, various types of data processing in step 107 can be selected in addition to those described in the embodiment.

As described above, according to this embodiment, the magnetic distance sensors 3.4 are provided in close proximity to the outer peripheral ends 110 and 111 of the flange portion 101 of the disk rotor 100, and the touch sensors 3.4 are further provided in sliding contact with the outer peripheral surface 107. '+j5 is provided, so the following effects can be suppressed.

(1) Even if there is a cast surface 108 with minute irregularities close to or substantially heavy on the outer periphery 1110, 111, the distance between the outer periphery 110 (111) and the magnetic distance sensor 3 (4) is Average measurement data regarding distance can be obtained.

(2) Displacement of the outer circumferential end 110111 in the direction perpendicular to the axis X can be accurately compensated for using the distance information in the radial direction of the disc rotor 100 derived from the measurement data of the touch sensor 5.

(3) Since the magnetic distance sensor 3.4 and the touch sensor 5 are used, the cooling fin portion 105 is not affected by vibration or deflection in the radial direction of the disk rotor 100 when the drive i11 device 2 rotates. Thickness can be measured accurately.

[Effects of the Invention] As explained above, the measuring device of the present invention positions the outer circumferential edge, which is the boundary between the polished outer circumferential surface of the disc-shaped article and the end surface that is the cast surface, close to the outer circumferential edge. Since it is configured to be detected by four magnetic distance sensors located at
The following effects can be achieved.

(1) The la air pressure distance sensor is sensitive only to the large surface shape of the disk-shaped article within its own sensitive area, and is not sensitive to minute irregularities on the surface. Even if there is, the minute irregularities are averaged out and cannot be seen in the output signal. This is because the four parts of the casting surface and the convex parts are generally small and close to each other. Therefore, according to the present device, even if the outer peripheral edge within the sensitive area of the magnetic distance sensor has minute irregularities in its vicinity, it does not output a signal related to the irregularities, and the average position of the boundary surface is detected. can be detected.

(2) Even without polishing the end surface (cast surface) in contact with the polished outer peripheral surface of the disc-shaped article, the average position of the outer peripheral end can be detected more accurately, and the one end surface (cast surface surface) can be detected more accurately. ) polishing process can be saved.

Furthermore, even if the one end surface (cast surface) has a shape that is difficult to polish, the average position of the outer peripheral end can be measured.

Furthermore, the technical idea of the present invention is to measure the position of the boundary between the polished surface and the casting surface of a casting by canceling out the unevenness of the casting surface, and the position can be measured using a magnetic distance sensor. It can also be applied to other cast iron products.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the measuring device of this embodiment, FIG. 2 is a schematic diagram of a partially enlarged area of FIG. 1, and FIG. 3 is a diagram showing the operation of the measuring device of this embodiment. It is a chart. 1...Inspection table 2...Drive device 3...Magnetic distance sensor 4...Magnetic distance sensor Patent applicant Hiroshi Okawa, representative of Aisin Takaoka Co., Ltd., patent attorney

Claims (2)

[Claims] (1) The one end surface having the cast surface of the flange of a disc-shaped article having a flange, the outer peripheral surface of the flange being a polished surface, and one end surface that partitions the outer peripheral surface being a cast surface. A side outer peripheral edge shape measuring device, comprising: an inspection table that rotatably supports a disk-shaped article around an axis of rotation, a drive device that rotates the disk-shaped article held on the inspection table, and the flange portion. A measuring device comprising: a magnetic distance sensor provided close to the outer peripheral end of the measuring device. (2) A touch sensor that comes into contact with the outer circumferential surface of the flange portion and measures the distance between the magnetic distance sensor and the outer circumferential surface, and a control section that corrects the value of the magnetic distance sensor based on the value of the touch sensor. Claim 1 having
Measuring device as described in section.