JPH0531082B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to the dimensions of the roller groove of a workpiece in which a roller groove is formed on the inner or outer circumferential surface, the indexing angle of the roller groove, and the pitch, circle, diameter (PCD) of the roller groove, etc. The present invention relates to a workpiece measuring device that measures each dimension of a workpiece.

A housing shaft (hereinafter referred to as a work) used in a universal joint of a front wheel drive vehicle, etc., has a cylindrical shaft portion 1 and a cup-shaped joint portion 2, as shown in the perspective view of Fig. 1. Three roller grooves 4, 5, and 6 are formed at equal intervals on the inner peripheral surface of the cup portion 2 so that a roller (not shown) on the other shaft side connected to the workpiece 3 can be fitted therein. ing.

By the way, due to the structure of such a workpiece 3, it is necessary to finish each roller groove 4 to 6 with high precision.
As shown in FIG. 2, the conventional workpiece measuring device brings one end of the measuring element into contact with the roller groove end 4c of the workpiece 3, and measures the roller groove surface 4a at a portion located a predetermined distance _L4 toward the center from the roller groove end 4c. , _4b was measured, and this value was taken as the maximum width of the roller groove 4. Therefore, when the accuracy of the roller groove end 4c is not good, such as in a cast work, the maximum width of the roller groove 4 can be measured. There was an inconvenience that an error occurred. Further, such a conventional workpiece measuring device only measures the maximum width of each of the roller grooves 4, 5, and 6 of the workpiece 3, and only measures the mutual angles (indexing angles) θ ₁ , θ ₂ , θ of the roller grooves 4 to 6. ₃ and the maximum width position P ₄ of the central axis 7 of the workpiece 3 and each roller groove 4 to 6,
It is not possible to measure CX, CY, and CZ, which is twice the distance from P ₅ and P ₆ (pitch circle diameter), and it is not possible to comprehensively measure the dimensions of roller grooves 4 to 6. I couldn't do it.

In view of the above circumstances, the present invention is capable of measuring the dimensions of the roller groove, indexing angle, pitch, circle, diameter, etc. of a workpiece having a roller groove on its inner or outer circumferential surface. It is an object of the present invention to provide a workpiece measuring device that can ensure high measurement accuracy by correcting each measurement value according to the amount of eccentricity even when the workpiece is fixed eccentrically from a predetermined position. It is something to do.

In order to achieve the above object, the workpiece measuring device of the present invention fixes a workpiece in which roller grooves are formed on the inner circumferential surface or outer circumferential surface of the workpiece, and also measures a desired location of the workpiece by bringing a measuring head into contact with the workpiece. In a workpiece measuring device for measuring dimensions; the first invention includes a reference positioning mechanism for fixing the workpiece at a desired position; and a measuring element is applied to a wall surface of a roller groove of the workpiece fixed by the reference positioning mechanism. a measuring mechanism that detects the wall spacing of the roller groove by bringing the probe into contact with the wall surface and moving the gauge along the wall surface: determining the groove center of the roller groove from the wall spacing obtained by the measuring mechanism; , an indexing angle calculating means for calculating an indexing angle from the reference position of the workpiece to the direction of the center of the groove.

Further, in a second invention, a reference positioning mechanism for fixing the workpiece at a desired position; a measuring element is brought into contact with a wall surface of a roller groove of the workpiece fixed by the reference positioning mechanism; a measuring mechanism that detects the wall spacing of the roller groove and the measurement position of the measuring stylus at this time by moving the probe along the wall surface; The present invention is characterized by comprising: calculation means for calculating the width; and dimension calculation means for calculating the distance between the maximum width position of the roller groove and the center position of the workpiece from the measurement position of the measuring element corresponding to the maximum width. .

Further, in the third invention, a fixing/measuring mechanism that clamps the workpiece and measures an amount of eccentricity between the position of the workpiece at this time and a preset reference position; The gauge head is brought into contact with the wall surface of the roller groove of the clamped workpiece, and the gauge head is moved along the wall surface to measure the wall distance of the roller groove and the measurement position of the gauge head at this time. Measuring mechanism for detecting: the wall distance obtained by this measuring mechanism and the indexing angle of the roller groove from the measurement position to the reference direction, or the distance between the maximum width position of the roller groove and the center position of the workpiece. calculation means for determining at least one of the two: correcting at least one of the indexing angle and the interval based on the eccentricity obtained by the fixing/measuring mechanism to compensate for errors caused by the eccentricity; The present invention is characterized in that it is equipped with a correction calculation means.

The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 3 is a perspective view showing an embodiment of the work measuring device according to the present invention. In this figure, 10
is a base of this work measuring device 11, and a work lifter 12 is provided in the center of this base 10. As shown in the cross-sectional view of FIG. 4, the work lifter 12 is supported by a shaft receiver 14 fitted into a through hole 13 formed in the upper plate 10a of the base 10, and is movable up and down by the shaft receiver 14. A first actuator 17 is fixed to the shaft 15, a frame 16 attached to the shaft receiver 14, a substrate 18 is fixed to the upper end of the shaft 15, and a first actuator 17 is rotatably attached to the substrate 18 by a bearing 19. Workpiece receiver 20 installed vertically
is fixed to one end of the board 18, and the gears 21,
The motor 25 rotates the workpiece 24 placed on the workpiece receiver 20 by rotating the workpiece receiver 20 about the axis 23 via the motor 22, and urges the first actuator 17. By protruding the shaft 26, the joint 27
The substrate 18 connected to the shaft 26 via the shaft 15 moves upward together with the base 1.
Workpiece 2 placed on workpiece receiver 20 of No. 8
4 is lifted into position. In this case, if the motor 25 is energized to rotate the workpiece receiver 20, the workpiece 24 will rotate along the axis 23 accordingly, and the workpiece will be reset so that its roller groove faces in a predetermined direction. I can do it.

Further, as shown in FIG. 3, a support section 30 is vertically provided at the rear of the upper plate 10a of the base 10, and supports extending forward are provided at an upper portion 30a and a center section 30b of the support section 30, respectively. A measuring section 33 is supported by plates 31 and 32. The measuring section 33 is the fifth
As shown in the partially cut-away front view of Figure a and the partially cut-away side view of Figure b, there is a boss 34 provided on the upper side of the support plate 31 concentrically with the axis 23 of the work lifter 12; A hollow shaft 35 is supported by the hollow shaft 34 so as to be vertically movable, and a center shaft 36 is provided within the hollow shaft 35 so as to be slidable therewith.
a frame 37 fixed to the outer circumferential surface of the boss 34; and a second frame 37 fixed to a support plate 38 provided near the center of the frame 37, the shaft 39 of which is connected to the upper end of the center shaft 36. The actuator 40 is vertically movably supported by the support plate 38, and its lower end is connected to the hollow shaft 35.
a slide support section 41 connected to the upper end; a support plate 42 provided at the upper end of the frame 37;
It is fixed on this support plate 42 and its shaft 4
3 is a lifter 45 having a third actuator 44 connected to the upper end of the slide support section 41;
A dimension detecting section 46, which is the main part of the measuring section 33, is formed at the lower end of the lifter 45. As shown in the front view of FIG. 6a, the right side view of FIG. 6b, and the left side view of FIG. It is constituted by a slide board 47 that is fixed through the slide board, a probe group 48 that is attached to the lower surface of the slide board 47, and a workpiece fixing mechanism 49 that is provided to the lower surface of the support plate 32. The work 24 lifted to a predetermined height by the work lifter 12 is fixed by the work fixing mechanism 49, and
The amount of eccentricity with respect to the axis 23 is measured, and then the dimensions of each roll groove 50, 51, 52 (see FIG. 7) in the workpiece 24 are measured by the group of probes 48. The slide substrate 47, probe group 48, and fixing mechanism 49 will be described in more detail below.

First, as shown in FIGS. 3 and 6 a, b, and c, the slide board 47 includes a plate-like member 53 having a triangular cross section, and a bottom surface of the plate-like member 53 from each side of the plate-like member 53. It is constructed by having auxiliary members 54, 55, and 56 attached so as to protrude, and a measuring element is attached to shaft attachment parts 57 to 59 formed at the bottom of these auxiliary members 54 to 56, respectively. Each swinging arm 60-62 of group 48 is pivotally supported. As shown in the perspective view of FIG. 7, the swing arm 60, which is one of the swing arms 60 to 62, is pivotally supported by the shaft 61 of the shaft mounting portion 57 and has a U-shaped vertical section. A member 62, a drive arm 63 attached to the front surface of this rotating member 62, a protrusion 64 provided near the center of this arm 63, and a spring shaft 28 that urges the drive arm 63 upward.
, a detector 29 for detecting the front end position of the drive arm 63, and a shaft 65 on the lower end side of the rotating member 62.
66, the first and second measuring elements 67 and 68 are each supported in a horizontally swingable manner;
A compression spring 69 provided between the second probes 67 and 68, and horizontal arms 70 and 71 extending laterally from both sides of the front end of the rotating member 62.
and first and second vertical arms 72, 73 attached to the tip sides of these horizontal arms 70, 71.
, detectors 74 and 75 that are attached to the lower ends of these vertical arms 72 and 73 and detect the amount of lateral swing of the first and second measurement elements 67 and 68; The contact elements 78 and 79 on the outer side of the lower end of the measuring elements 67 and 68 are connected to the rollers of the workpiece 24. By making contact with the inner walls 50a, 50b of the groove 50 and swinging these probes 67, 68 in the front-rear direction (directions of arrows A and B), the inner wall 5 of the roll groove 50
A signal corresponding to the interval between 0a and 50b is detected by the detector 7.
It is output from 4,75. In other words, the measuring head 6
With the protruding rollers 76, 77 of 7, 68 pressed from both sides to close the lower end sides of these probes 67, 68, the lower ends of these probes 67, 68 are placed on the workpiece 24.
If the pressing force of the protruding rollers 76 and 77 is released after the roller groove 50 of the compression spring 69 is inserted, the compression spring 69
The lower end sides of the probes 67 and 68 are expanded by
Abutting elements 78 and 79 of these measuring elements 67 and 68 abut against inner walls 50a and 50b of roller groove 50, respectively. Therefore, after this, if the front end side of the drive arm 63 is moved up and down and the lower end sides of the measuring elements 67 and 68 are moved back and forth within the roller groove 50, the inner wall 5
Depending on the surface shape of 0a, 50b, measuring stylus 67, 68
swings laterally, and the detectors 74 and 75 output signals corresponding to the amount of swing at this time.

Further, the swinging arms 61 and 62 are also constructed in the same manner as the swinging arm 60 described above, and the swinging arm 60 is connected to the roller groove 5 of the workpiece 24.
When the probe 23 of the swinging arm 61 is inserted into the
0 and 231 are inserted into the roller groove 51, and the lower ends of the probes 232 and 233 of the swinging arm 62 are inserted into the roller groove 52, so that they are attached to the slide substrate 47 in such a position.

On the other hand, as shown in FIG.
8, 230, 231, 232, 233 protruding rollers 76, 77, 234, 235, 236, 237
A screw mechanism 80 for pressing is provided.
The screw mechanism 80 includes screw bearings 81, 82, 83 provided at the apex portion of the plate member 53.
, screw shafts 84 , 85 , 86 mounted on these screw bearings 81 - 83 , respectively, and trapezoidal tapered parts 87 , 88 , 89 mounted on the lower ends of these screw shafts 84 - 86 , respectively.
and sprockets 90, 91, 92 respectively attached to the upper ends of the screw shafts 84 to 86,
A chain 93 stretched between these sprockets 90 to 92 and a fourth actuator 9 connected to the screw shaft 86 via a connecting fitting 94.
5, and when the screw shaft 86 is pressed downward by the fourth actuator 95, the screw shaft 86 moves downward while rotating, and the rotation at this time is transmitted to the other screw shafts 84, 85 by the chain 93, and these screw shafts 84-86 move downward in conjunction. In this case, a ring 96 is attached to the screw shaft 84, and when the first proximity sensor 97 detects this ring 96 when pushing down the screw shafts 84 to 86, that is, each tapered portion 87 to 89 is connected to each protrusion. roller 7
6, 77, 234-237, the fourth actuator 95 is deenergized, and when the screw shafts 84-86 are pulled up, the ring 98 attached to the screw shaft 86 is activated by the second proximity sensor 99. When detected, that is, each taper portion 87 to 89 is connected to each protruding roller 76, 77, 234 to
When 237 is no longer pressed, the fourth actuator 95 is deenergized.

On the other hand, the auxiliary members 54 of the slide board 47
Each of the probes 67, 68, 2 is attached to the protruding portion of 56.
A drive mechanism 100 is provided for sliding the roller grooves 30, 231, 232, 233 into contact with the roller grooves 50, 51, 52 (see FIG. 7) of the workpiece 24. The drive mechanism 100 includes bearings 104, 105, and 106 that are fitted vertically through the auxiliary members 54 to 56, and the auxiliary member 54.
Rotary shafts 107, 108, 109 are respectively attached to the respective bearings 104-106 so as to protrude upward and downward from 56, and taper cams 110, 111, 112 are attached to the lower ends of these respective rotary shafts 107-109. and each rotating shaft 107
~ Sprocket 1 attached to the upper end of 109
13, 114, 115, and a chain 116 stretched between these sprockets 113 to 115.
and the rotating shaft 10 via gears 117 and 118.
When the motor 119 is energized to rotate the rotating shaft 107, this rotational force is transmitted through the chain 116 to the other rotating shaft 108. , 109, and taper cams 110-112 are attached to the lower ends of these rotating shafts 107-108.
4, 242, 243 through each probe 67, 6
8, 230 to 233 correspond to axes 61 and 24, respectively.
It swings around 4,245. And in this case,
The amount of swing of each measuring element 67, 68, 230-233 corresponding to each measuring element 67, 68, 230-233 by each detector 29, 183, 189 in contact with each driving arm 63, 240, 241, that is, each measuring element 67, 68, 230-23
3 contact elements 78, 79, 250, 251, 25
2,253 positions are detected.

In this way, each roller groove 50 of the workpiece 24 is lifted to a predetermined height by the workpiece lifter 12 by the probe group 48 constituted by the respective swing arms 60 to 62, the screw mechanism 80, and the drive mechanism 100. , 51, 52 are continuously measured from the center axis side to the roller groove ends 50c, 51c, 52c side (or from the roller groove ends 50c, 51c, 52c side to the center axis side), and Contact elements 78, 79, 250, 251, 252, 253 of measuring elements 67, 68, 230 to 233
The position of the part in contact with is continuously measured.

As shown in FIGS. 6a, b, and c, the fixing mechanism 49 includes a scroll chuck 135 attached to the lower surface of the support plate 32, and a scroll chuck 135 attached to the lower surface of the scroll chuck 135 at the roller groove position of the workpiece 24. Correspondingly provided fixed clamp part 13
6, 137, the movable clamp part 138 and the respective fixed clamp arms 139, 140 attached to the slide members 151, 152 constituting the fixed clamp parts 136, 137 are provided on the outer and inner surfaces of the lower ends, respectively. Junction 141-144,
145 to 148, a movable clamp arm 150 pivotally supported by a slide member 149 constituting the movable clamp section 138, and the slide member 14.
9 attached to said movable clamp arm 150
a fifth actuator 153 that oscillates the movable clamp arm 150; a detector 154 that detects the amount of oscillation at this time and detects the lower end position of the movable clamp arm 150; The lower end portions of the measuring elements 67, 68, 230 to 233, which extend downward through the support plate 32 and the scroll chuck 135, have contact elements 155, 156. As shown in the perspective view of FIG. 8, they are arranged on both sides of each fixed clamp arm 139, 140 and movable clamp arm 150, respectively. In this case, since each slide member 149, 151, 152 can be moved in the radial direction by the scroll chuck 135, by adjusting the scroll chuck 135, the fixed clamp arms 139, 140 and the movable Clamp arm 150
The respective outer surface positions of the roller grooves 50, 5 of the workpiece 24 are
1 and 52, the fifth actuator 153 is energized to rotate the lower end side of the movable clamp arm 150 outward, and the fixed clamp arms 139 and 140 and the movable clamp arm 150 contact elements 141 to 1
44, 155 contact the corresponding roller groove ends 50c, 51c, 52c of the work 24, respectively, and the work 2
4 is fixed at three points. In this case, the fixed clamp arms 139 and 140 set by the scroll chuck 135 and the movable clamp arm 15
0 do not match the inner diameter of the workpiece 24, the center line 160 of the workpiece 24 and the axis 23 deviate from each other as shown in the plan view of FIG. It is detected by the detector 154 as the swing distance d of the lower end side of the arm 150.

On the other hand, in addition to the case where the workpiece 24 is fixed using such a clamp mechanism, when there is a center groove 24a inside the workpiece 24 as shown in FIGS. 6a, b, and c, the second actuator 40 (5th
(see Figures a and b) to make the center shaft 36 protrude downward, and the lower end of this center shaft 36 is fitted into the center groove 24a. The workpiece 24 may be fixed by a screw (see Fig. 4). In this case, since the center line of the workpiece 24 always coincides with the axis 23, the eccentric distance thereof is always zero.

Further, as shown in FIG. 3, a zero set mechanism 161 is provided at a predetermined height from the bottom of the support section 30. The zero set mechanism 161 includes a guide rail 163 horizontally attached to the front plate 162 of the support section 30, and a reference workpiece mounting table 164 slidably attached to the guide rail 163.
Then, by moving the reference workpiece mounting table 164 in the horizontal direction, the reference workpiece 165 placed on the reference workpiece mounting table 164 is moved to the measuring element 6768, 230 to 2.
33, and a sixth actuator 166 set on the lower end side of the measuring element 6.
The roll groove data of the reference work 165 set at positions 7, 68, 230 to 233 is
8, this measurement result is stored, and the data of the workpiece to be measured thereafter is compared with the data of the reference workpiece 165, and the quality of the workpiece can be easily determined based on the comparison result.

Next, an example of the circuit configuration of this embodiment will be explained with reference to the drawings.

FIG. 10 shows each detector 2 of the probe group 48 mentioned above.
9, 74, 75, 181, 182, 183, 18
7, 188, 189 and the output of the detector 195 of the fixing mechanism 49. FIG. In this figure, 74 and 75 are detectors for measuring the groove width provided on the swing arm 60, and the signals drx and dx obtained by these detectors 74 and 75 are sent to the corresponding amplifier 17.
0 and 171 to the first and second peak hold circuits 172 and 173, respectively, and their peak values are held, and the signals corresponding to these peak values are
rx, x are supplied to the analog calculation circuit 174 and also supplied to the first addition circuit 175,
Here, these signals rx and x are added, and the addition result (signal x) is supplied to the comparator circuit 176. The outputs of the detectors 74 and 75 are also supplied to a second addition circuit 177, where they are added together and supplied to the comparator circuit 176. The comparator circuit 176 receives the outputs of the first and second adder circuits 175 and 177 when the swing arm finishes its forward movement (peak value detection operation) and starts its return movement (roll groove width measurement operation). During this comparison operation period, the output of the second adder circuit 177 is the same as that of the first adder circuit 17.
When the output of point 6 reaches 90%, that is, the output of point 6
When the contact elements 78 and 79 (see FIG. 7) of 7 and 68 come to positions P ₁ and P ₂ shown in the plan view of FIG. Supply to 179. The sample and hold circuits 178 and 179 are supplied with the output (signal dpx) of the measurement position detection detector 29 provided on the swing arm 60 via the amplifier 213, and are connected to the signals S1 and S2. The signal dxp is sampled in synchronization with each other, and the sampling results (signals dpx ₁ , dpx ₂ ) are supplied to the third adder circuit 180 . The third adder circuit 180 adds the signals dpx ₁ and dpx ₂ and then divides the addition result by 2 to obtain the signal Px (Px=dpx ₁ +dpx ₂ /2).
This signal Px is supplied to the analog calculation circuit 174. Also, 181,1
82 is a groove width measuring detector provided on the swing arm 61, and these detectors 181, 18
2 outputs (signals dry, dy) and a detector 1 for detecting the measurement position provided on the swing arm 61.
83 outputs (signal dpy) are output from each corresponding amplifier 1.
84, 185, 186 and then the first
Each of the detectors 74,
The signals ry, y, and py, which are the results of this processing, are processed in the same manner as the outputs of 75 and 29, and are supplied to the analog arithmetic circuit 174. Further, the signals drz, dz outputted by the groove width measuring detectors 187 and 188 of the swinging arm 62 and the signal dpz outputted by the measurement position detection detector 189 of the swinging arm 62.
After being amplified by the corresponding amplifiers 190, 191, and 192, they are processed in the same manner as described above, and the processing results (signals rz, z, pz) are supplied to the analog arithmetic circuit 174.

Further, 195 is a detector for measuring the eccentric distance of the workpiece provided on the movable arm 150 (see FIG. 8), and when the workpiece 24 is clamped, that is, each of the detectors 74, 75, 29, 181, 1
When the circuits 82, 183, 187, 188, and 189 operate, they output a signal d, which is also supplied to the analog arithmetic circuit 174 via an amplifier 196. The analog calculation circuit 174 performs analog calculations as shown in the following equations: AX=rx+x AY=ry+y AZ=rz+z...(1) The respective signals rx, x, px to rz, z,
From pz and signal d, determine the roller groove dimensions AX, AY, AZ, indexing angles BX, BY, BZ, PCD (pitch circle diameter) CX, CY, CZ of the workpiece 24 as shown in Fig. 11, and
A switch (not shown) selects signals dr, de, dp corresponding to the roller groove selected and a signal d corresponding to the eccentric distance. Therefore, when the measured roller groove signal is selected, the signals rx, x, px are selected as the signals dr, de, dp, and the signal d is selected and the A/D conversion circuit (analog/digital conversion circuit) 201, while the roller groove dimensions AX~AZ, index angle BX
~BZ, PCD CX~CZ are supplied to the zero set circuit 200. The zero set circuit 200 stores in advance in the master value storage circuit 202 the standard roller groove dimensions AX ₀ to AZ ₀ , the standard indexing angle BX ₀ to BZ ₀ , and the standard PCD CX ₀ to CZ ₀ corresponding to the standard workpiece. Based on the above roll groove dimensions AX~AZ, index angle
This is to find the deviation amount of BX ~ BZ, PCD CX ~ CZ, and the roll groove deviation which is the amount of each of these deviations
AX−AX ₀ ~AZ−AZ ₀ , indexing angle deviation BX−
BX ₀ ~BZ−BZ ₀ , PCD deviationCX−CX ₀ ~CZ−CZ ₀
is supplied to the A/D conversion circuit 201. A/
The D conversion circuit 201 is a CPU (microprocessor)
Each signal and each deviation are A/D converted in response to a conversion command from the bus line 203, and the conversion results (data) are sent onto the bus line 204. The CPU 203 takes in each of these data on the bus line 204, determines whether or not these are appropriate values, controls each part of the device based on the result of this determination, and outputs the result of the determination to the output interface 205. is supplied to a lamp group 206 for display, and the determination results and each measurement value data are supplied to a keyboard/printer 208 via a serial I/O (serial input/output circuit) 207. Print it out here. Further, when the work measured by each of the detectors 74, 75, to 188, 189 is a reference work, the CPU 203 determines the new reference roller groove dimension AX ₀ obtained at this time.
~AZ ₀ , Reference indexing angle BX ₀ ~BZ ₀ , Reference PCD
CX ₀ ~ CZ ₀ output interface 20
9 to the display device 210 to display these values, and also to the latch circuit 211 of the master value storage circuit 202 to update the reference data. And this new reference data is a D/A conversion circuit (digital/analog conversion circuit)
D/A conversion is performed at step 212, and the conversion result is supplied to the zero set circuit 200.

In this way, in this circuit, each detector 74,
Since the outputs of the detectors 75 to 188, 189 are corrected, high measurement accuracy can be ensured even when the workpiece 24 is eccentrically clamped.
Since the output of 195 is processed to obtain not only the dimensions of the roll groove but also the indexing angle and PCD, it is possible to more accurately determine whether the work is good or bad. In this case, when the workpiece is fixed by the center shaft 36, d in the equations (1) to (3) is set to zero and the arithmetic processing is performed.

Further, in the embodiment described above, the analog calculation circuit 174 performs the calculations shown in equations (1) to (3) above, and calculates the roller groove dimensions AX, AY, AZ, index angle BX,
BY, BZ, PCD CX, CY, and CZ are obtained, but these may also be obtained by the CPU 203.

As explained above, the workpiece measuring device according to the present invention, after positioning the workpiece, brings the measuring element into contact with the wall surface of the roller groove of the workpiece, moves the measuring element along the wall surface of the roller groove, and moves the measuring element to the roller groove wall surface of the workpiece. The wall spacing of the groove and, if necessary, the measuring position of the probe at this time are detected, and from these detection results, the indexing angle of the roller groove with respect to the reference direction or the PCD of the roller groove can be determined. Even if the roller groove end position of the workpiece is not accurate, the roller groove dimensions of the workpiece,
Each dimension such as index angle and PCD can be accurately measured. In this case, even if the workpiece is set eccentrically, each calculated value is corrected according to the eccentricity distance at this time, ensuring high measurement accuracy even when the diameter of the workpiece changes. I can do it.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of a workpiece, Fig. 2 is a diagram for explaining a conventional workpiece measuring device, and Fig. 3 is a perspective view showing an example of a workpiece.
The figure is a perspective view showing an embodiment of a workpiece measuring device according to the present invention, and FIG. 4 is a workpiece lifter 1 of the same embodiment.
2, FIGS. 5a and 5b are front views and partially cutaway right side views showing details of the lifter 45 of the same embodiment, and FIGS. 6a, b, and c are respectively sectional views of the same embodiment. The front view, right side view, left side view, and FIG. 7 showing the details of the dimension detection unit 46 are the swing arm 6 of the same embodiment
8 is a perspective view showing details of the clamping mechanism of the same embodiment, FIG. 9 is a plan view of the clamping mechanism, and FIG. 10 is a circuit configuration example of the same embodiment. The block diagram shown in FIG. 11 is a diagram for explaining this block diagram. 24... Workpiece, 33... Measuring section (measuring mechanism),
36,160...center axis (reference positioning mechanism),
49...Fixing mechanism (fixing/measuring mechanism), 50,5
1, 52...Roller groove, 50a, 50b, 51
a, 51b, 52a, 52b...Wall surface, 67, 6
8, 230, 231, 232, 233... Measuring head, 174... Analog calculation circuit (calculation means, angle calculation means, dimension calculation means, correction means).

Claims (1)

[Scope of Claims] 1. A workpiece measuring device that fixes a workpiece having roller grooves formed on its inner circumferential surface or outer circumferential surface, and measures the dimensions of a desired portion of the workpiece by bringing a measuring element into contact with the workpiece. a reference positioning mechanism for fixing the workpiece at a desired position; and: a contacting probe is brought into contact with a wall surface of the roller groove of the workpiece fixed by the reference positioning mechanism, and the probe is moved along the wall surface. a measuring mechanism for detecting the wall spacing of the roller groove by: determining the groove center of the roller groove from the wall spacing obtained by the measuring mechanism; A workpiece measuring device comprising: indexing angle calculation means for calculating an indexing angle. 2. In a workpiece measuring device that fixes a workpiece having roller grooves formed on its inner circumferential surface or outer circumferential surface, and measures the dimensions of a desired part of the workpiece by bringing a probe into contact with the workpiece; a reference positioning mechanism fixed to the workpiece; a measuring element is brought into contact with the wall surface of the roller groove of the workpiece fixed by the reference positioning mechanism, and the measuring element is moved along the wall surface to move the measuring element into the roller groove; a measuring mechanism for detecting the wall spacing and the measurement position of the contact point at this time; and a calculation means for determining the maximum width of the roller groove from the wall spacing obtained by the measuring mechanism; A workpiece measuring device comprising: a dimension calculation means for determining the distance between the maximum width position of the roller groove and the center position of the workpiece from the measurement position of the measuring element. 3. In a workpiece measuring device that fixes a workpiece having roller grooves formed on its inner circumferential surface or outer circumferential surface, and measures the dimensions of a desired part of the workpiece by bringing a contact point into contact with the workpiece; clamping the workpiece. and a fixing/measuring mechanism for measuring the amount of eccentricity between the workpiece position at this time and a preset reference position; A measuring mechanism that brings a measuring element into contact with the measuring element and moves the measuring element along the wall surface to detect the wall spacing of the roller groove and the measurement position of the measuring element at this time; calculation means for calculating at least one of the indexing angle of the roller groove with respect to the reference direction from the wall interval and the measurement position, or the interval between the maximum width position of the roller groove and the center position of the workpiece; It is characterized by comprising a correction calculation means for correcting at least either the index angle or the interval based on the eccentricity obtained by the measuring mechanism to compensate for errors caused by the eccentricity. Workpiece measuring device.