JPS6123761Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is based on parts with spherical shapes such as the outer race and inner race, which are the components of constant velocity universal joints used in the drive axles of independent suspension automobiles. This invention relates to a device for measuring the position of a ball center from a reference plane.

After assembling the components of a constant velocity universal joint (hereinafter also referred to as constant velocity joint), in order to ensure that there is no play between the parts and to ensure the durability of the constant velocity joint, each component must be assembled with high precision. It is necessary to process it into To measure the accuracy of these machined parts, we measure the axial position of the outer spherical center and ball groove center for the outer race, which has a spherical shape, and the axial position of the outer spherical center and the ball groove center for the inner race. . For example, when measuring the outer spherical center of an inner race, conventionally, the height in the radial direction of the inner race, which is the object to be measured, is measured from the reference plane of this inner race in the axial direction. do. Then, find another point in the axial direction that is at the same height as the previous measurement. The position bisecting the distance between the two points determined in this way was determined as the outer spherical center position of the inner race. In order to improve the measurement accuracy of the outer ball center position obtained in this way, repeat the same operation 3 to 4 times.
The average value of the measured values was taken. The conventional method of measuring the position of the ball center has disadvantages in that it takes a long time to measure and requires a highly accurate measuring device.

In view of the above, the purpose of this invention is to provide a ball center measuring device that requires short measuring time, does not require a high-precision measuring device, and can be used as a measuring gauge during the work process. be.

Next, this invention will be explained based on an embodiment shown in the drawings.

In FIG. 1, there is a rectangular substrate 2 on the base 1 of the ball center measuring device. This substrate 2 has a left side wall 3 and a right side wall 4 provided on both sides in the longitudinal direction at right angles to the substrate 2. The round bar-shaped upper shaft 5 is fitted into upper holes 3a and 4a provided in both side walls 3 and 4 of the base 1, respectively, and is attached to both side walls 3 and 4 in parallel to the substrate 2. Further, in both side walls 3 and 4, lower holes 3 having a smaller hole diameter than the upper holes 3a and 4a are provided below the upper holes 3a and 4a.
b and 4b are drilled, respectively, and round rod-shaped lower shafts 6 are attached to both side walls 3 and 4 by fitting into these lower holes 3b and 4b. This lower shaft 6 is parallel to the upper shaft 5.

The movable table 7 has a cutout-shaped movable ball receiving portion 8 on one side (right side in the figure) of its upper surface 7a, and a spring receiving portion 9 is provided below the movable ball receiving portion 8 to protrude downward. There is. The moving table 7 is provided with an upper through hole 7b into which the upper shaft 5 is slidably inserted, and the spring receiver 9 is provided with a lower through hole 9a into which the lower shaft 6 is slidably inserted. ing.

The movable table 7 formed as described above has the movable ball receiver 8 (therefore, the spring receiver 9) side connected to the upper shaft 5.
The upper through hole 7b toward the center side in the longitudinal direction.
The upper shaft 5 is inserted into the lower through hole 9.
A lower shaft 6 is inserted into a and attached to the base 1. Therefore, the movable table 7 is connected to the base 1
It is movable along an upper shaft 5 and a lower shaft 6 which are parallel to each other. In this way, the movable table 7 attached to the base 1 has its upper surface 7a protruding above the left side wall 3, and is fitted onto the outside of the lower shaft 6 between the spring receiver 9 and the left side wall 3. The inserted compression spring 10 constantly presses the upper shaft 5 in the right direction in the drawing parallel to its longitudinal direction. The movable ball receiving portion 8 of the movable base 7 has an upper surface 7a of the movable base 7.
A movable steel ball 11 is rotatably attached to a presser plate 12 attached to the
This movable ball 11 is in a state of protruding above and to the side of the movable ball receiving portion 8. The diameter of this movable ball 11 is the same as the diameter of a ball (not shown) rolling in the ball groove W1 of the object W to be measured.

The ball fixing table 13 is located close to the left side wall 3, and its lower end is attached and fixed to the substrate 2. Note that a mounting member (not shown) for fixing the ball fixing table 13 to the substrate 2 is provided at the rear (backward direction) in FIG. 1, and therefore does not impede the movement of the movable table 7. Moreover, the moving table 7 also moves relative to the ball fixing table 13 due to the movement. The upper part of the ball fixing table 13 is a ball mounting part 1 that extends forward in the figure above the moving table 7.
4, and a predetermined distance is provided between the lower surface 14a of this ball mounting portion 14 and the upper surface 7a of the moving table 7. A fixed ball receiving part 15 is provided in the right end of the ball mounting part 14 in the shape of a notch, and a steel plate is attached to this fixed ball receiving part 15 by a presser plate 16 attached to the lower surface of the ball mounting part 14. A fixed ball 17 is attached. Therefore, the movable ball 11 can move relative to the fixed ball 17 due to the above-mentioned relative relationship between the movable table 7 and the ball fixed table 13. and,
This fixed ball 17 has the same diameter as the movable ball 11, and is supported by the press plate 16 in a rolling manner like the movable ball 11. The ball mounting part 14 has a lever support part 18 projecting from the side opposite to the fixed ball receiving part 15, and a support part 19 for a dial gauge 20 projecting from the upper part of the lever support part 18. A measurement lever 2 is attached to the lever support portion 18.
1 is swingably supported by a support shaft 22.
A protrusion 21a is protruded from the lower end of the measuring lever 21 and comes into contact with the side wall of the moving table 7 (the left wall in the figure). The upper part of the measuring lever 21 protrudes upward from the upper surface of the ball attachment part 14, and this protrusion has an attachment hole 19 of the dial gauge support part 19.
The tip of the probe 20b of the dial gauge 20, whose shaft portion 20a is fixed by a set bolt 23, is brought into contact with the probe 20a. The workpiece fixing table 24 has a flat workpiece mounting surface 24a, and a bolt mounting hole 24c for mounting the workpiece W, which is the object to be measured, is drilled in the workpiece mounting surface 24a. A pin support portion 25 is provided to protrude upward from the workpiece mounting surface 24a, and a spring receiving portion 25 is provided below the workpiece mounting surface 24a.
6 is provided to protrude downward. The workpiece fixing table 24 has an upper through hole 24b formed below the workpiece mounting surface 24a, parallel to the workpiece mounting surface 24a, into which the upper shaft 5 is slidably inserted. A lower through hole 26a into which the lower shaft 6 is slidably inserted is provided parallel to the through hole 24b. Work fixing stand 24
The support hole 25a that slidably supports the phase determining pin 27 in the phase determining pin support portion 25 is connected to the upper through hole 2.
It is opened parallel to 4b. Phase determining pin 27
has a bullet shape, and a phase determining end 27a protruding from the support hole 25a toward the workpiece mounting surface 24a is semispherical, and its diameter is approximately the same as the diameter of the movable ball 11. The phase determining pin 27 has a shaft hole 27b bored from the side opposite to the phase determining end 27a, and the shaft hole 27b is formed at the tip of the shaft hole 27b.
A screw hole 27c is provided for screwing in a positioning bolt 28 having a smaller diameter. The fixing plate 29 is attached to the surface of the phasing pin support 25 opposite to the workpiece mounting surface 24a, and the positioning bolt 28 inserted into the hole 29a from the outside of the fixing plate 29 is inserted into the screw of the phasing pin 27. hole 2
7c to determine the forward end position of the phase determining pin 27. A compression spring 30 is fitted on the outside of the positioning bolt 28 and acts in a direction to separate the phase determining pin 27 from the fixed plate 29.

The workpiece fixing table 24 formed as described above is
It is attached to the base 1 with its work mounting surface 24a facing the movable ball 11 of the moving table 7, and further inserting the upper shaft 5 into the upper through hole 24b and the lower shaft 6 into the lower through hole 26a. . A compression spring 31 fitted on the outside of the lower shaft 6 is provided between the spring receiving portion 26 of the workpiece fixing table 24 and the right side wall 4.
The workpiece fixing table 24 is constantly pressed in the direction of the movable table 7 by the compression spring 31.

As described above, the height between the workpiece mounting surface 24a of the workpiece fixing table 24 attached to the base 1 and the center of the movable ball 11 can be arbitrarily determined depending on the groove shape of the workpiece W to be measured. Move the center of the movable ball 11 as far as possible to the workpiece W without the ball 11 coming out of the ball groove of the workpiece W.
For measurement accuracy, it is desirable to keep the distance from the center of the ball groove. Center of fixed ball 17 and workpiece mounting surface 24a
The same is true for the height. The workpiece mounting surface 24a is finished parallel to the center line of the upper shaft 5, and the surfaces 7c and 7d for determining the position of the movable ball 11 and the surfaces 17c and 17d for determining the position of the fixed ball 17 are respectively perpendicular to the drawing. Large surfaces 7c and 17c are parallel to the workpiece mounting surface 24a,
Surfaces 7d and 17d are perpendicular to the workpiece mounting surface 24a.

The operation of the ball center measuring device having the above configuration will be explained.

In order to measure the position of the ball center using this ball center measuring device, a master M that is accurately finished to the standard dimensions of the object to be measured is used. This master M is connected from the bottom surface M1, which is the reference surface, to the ball groove M2, as shown in FIG.
The ball is manufactured so that the distance L to the center O of the ball groove matches the reference dimension, and the radius R from the center O to the ball groove M2 matches the known reference dimension. Then, this master M places its bottom surface M1 on the workpiece mounting surface 24a of the workpiece fixing table 24, presses one ball groove M2 against the fixed ball 17, and presses one ball groove M2 against the fixed ball 17, and a ball groove M3 located at a position 180 degrees different from this ball groove M2.
Insert the phase determining end 27a of the phase determining pin 27 into. Since the positioning pin 27 is pressed by the compression spring 30, it is pressed into contact with the ball groove M2. In this state, the master M is tightened to the workpiece mounting surface 24a using the fixing bolt 32.

In the master M attached to the workpiece fixing base 24 as described above, the moving base 7 is pressed toward the workpiece fixing base 24 by the compression spring 10, and the workpiece fixing base 24 is pushed toward the moving base 7 by the compression spring 31. Since it is pressed, not only the fixed ball 17 but also the movable ball 11 come into contact with the surface of the ball groove M2 of the master M. In this state, the protrusion 21a of the measuring lever 21 is brought into contact with the left side surface of the moving table 7, and the position of the measuring lever 21 is read by the needle of the dial gauge 20. The reading of the needle of the dial gauge 20 at this time serves as a reference for measuring the spherical center position of the ball groove of the workpiece W.

Note that the vertical distance H between the center 17a of the fixed ball 17 and the center 11a of the movable ball 11 is between the surface 7c and the surface 1.
4c is finished parallel to the center line of the upper shaft 5, so it does not change and remains constant during measurement.

Next, a case will be described with reference to FIG. 3 in which a workpiece W whose distance from the bottom surface to the center of the ball groove is smaller than the distance L of the master M is measured by this measuring device. Here, the workpiece W is the bottom surface W which is the reference surface.
1 to the center A of the ball groove W2 is smaller than the distance L from the bottom surface M1 of the master M to the center O of the ball groove M2 by Δh, and both ball grooves M
2 and W2 have the same radius R.

Fix the workpiece W to the workpiece fixing base 24 in the same way as the master M was attached. As a result, the ball groove W2 of the workpiece W is pressed against the fixed ball 17. In this case, since the center A of the ball groove W2 is shifted downward from the center O of the ball groove M2 of the master M, the work W is moved further leftward in the figure by δ ₁ toward the fixed ball 17 compared to the master M. The movable ball 11 is pushed and moved until it hits the fixed ball 17. Since the movable ball 11 is pushed in the direction of the left side wall 3 by the ball groove W2 of the workpiece W, the movable table 7 also moves by _δ1 in the same direction against the pressing force of the compression spring 10. Furthermore, compared to the case of the master M, the movable ball 11 itself is pushed and moved by _δ2 to the left in the figure in the case of the workpiece W. Then, similarly, the moving table 7 is further moved to the left by δ ₂ . Therefore, the protrusion 21a of the measuring lever 21 is δ ₁ + δ ₂
The dial gauge 20 is pushed to the left in the figure by an amount of differs from the reading in the case of master M by (δ ₁ +δ ₂ )×(lever ratio of measurement lever 21). Then, due to the difference between the reading of the dial gauge 20 when the master M is attached to the workpiece fixing base 24 and the reading of the dial gauge 20 when the workpiece W is attached to the workpiece fixing base 24, the ball groove W2 of the workpiece W is determined. Center A
The position of is measured.

Here, the measurement of the workpiece W will be further explained in detail.

In FIG. 3, B and C are the center positions of the fixed ball 17 and the movable ball 11 when they are in contact with the workpiece W, and D is the center A of the ball groove W2 of the workpiece W.
A point on a line passing through and parallel to the bottom surface W1 of the workpiece W. The relationship between the angle θ ₁ indicated by ∠BAD and the angle θ ₂ indicated by ∠CAD is tanθ ₁ −tan (−θ ₂ ).
If there is a relationship of =1, the amount of movement of the movable ball 11 in the direction parallel to the reference surface W1 matches the amount of movement of the center of the ball groove W2 of the workpiece W in the axial direction.

That is, the amount of movement of the fixed ball 17 in the direction parallel to the reference plane W1 is assumed to be δ ₁ , and the amount of movement of the movable ball 11 in the direction parallel to the reference plane W2 is assumed to be δ ₂ . on the other hand,
The amount of displacement Δh of the center A of the workpiece W from the center O of the master M is the radius R of the ball groove W2 of the workpiece W.
Therefore, by calculating the length in the vertical direction in the figure from Figure 3, if the radius of the ball is R, (R + r) sin α + Δh = (R + r) sin θ ₁ (a) However, α is the angle formed by the center O of the ball groove M2 of the master M and the center 17a of the fixed ball 17.

Similarly, by calculating the length in the horizontal direction, (R+r)cosα=(R+r)cosθ ₁ +δ ₁ (b) From (a)(b), sin ² α=(sinθ ₁ −Δh/R+r) ² (a) ′ cos ² α=(cosθ ₁ +δ ₁ /R+r) ² (b)′ From (a)′+(b)′=1, 1=sin ² θ ₁ +cos ² θ ₁ −2Δh/R+rsinθ ₁ +2δ ₁ /R+rcosθ ₁ +(Δh/R+r) ² +
(δ ₁ /R+r) ² (c) Since Δh/(R+r)<<1, from (c) 0≒2δ ₁ /R+rcosθ ₁ −2Δh/R+rsinθ ₁
(c)′ Therefore, δ ₁ =Δhtanθ ₁ (d). Similarly, the relationship -δ ₂ =Δtan(θ ₂ ) can be found.

Since the fixed ball 17 does not move, the amount of movement of the movable ball 11 is δ ₁ −(−δ ₂ )=Δh(tanθ ₁ −tan(−θ
₂ )) δ ₁ +δ ₂ =Δh(tanθ ₁ +tanθ ₂ ).

From the above equation, tanθ ₁ +tanθ ₂ =1 is sufficient to make the axial misalignment amount Δh of the workpiece W and the movement amount δ ₁ +δ ₂ of the movable ball 11 the same.

Note that if the above relationship holds true when the master M is attached to the apparatus, it also holds true when the workpiece W is measured.

In addition, if it is difficult to establish the relationship of the above formula due to the mold structure, please use the measuring lever 2 in Fig. 1.
The ratio of the dimension from the support shaft 22 of 1 to the position where the measuring tip 20b of the dial gauge 20 contacts the measuring lever 21 and the dimension to the position where the protrusion 21a of the measuring lever 21 contacts the moving table 7 is set appropriately. By taking the values, it is possible to match the movement amount δ ₁ +δ ₂ of the movable ball 11 with the axial movement amount Δh of the center A of the ball groove W2 of the workpiece W.

FIG. 4 shows a second embodiment. This embodiment is a device that directly measures the axial position of the ball groove center A of a workpiece W.

In this figure, the same components as in the first embodiment are given the same reference numerals. In the figure, the support stand 34 is similar to the workpiece fixing stand 24 of the first embodiment.
There is an upper through hole 34a through which the upper shaft 5 attached to the left and right side walls 3 and 4 of the base 1 is slidably inserted, and a lower shaft 6 is slidably inserted into the spring receiver 35. There is a lower through hole 35a for this purpose. The support base 34 is provided with a round bar-shaped guide portion 36 projecting upward at the center of its upper surface, and a square-shaped dial gauge support portion 37 is provided at the end of the upper surface opposite to the spring receiving portion 35. It is being This support stand 34 is attached to the base 1 by passing the upper shaft 5 through the upper through hole 34a and the lower shaft 6 through the lower through hole 35a. The support base 34 is always pressed in the direction of the movable base 7 because the spring receiving portion 35 is pressed by the compression spring 31.

The upper surface of one side of the workpiece fixing table 38 serves as a workpiece mounting surface 38a, and a transfer pin support portion 39 is provided on the other side thereof to protrude upward from the workpiece mounting surface 38a. The workpiece fixing table 38 has a guide hole 38b in the center thereof, into which the guide part 36 of the support table 34 is slidably inserted.
The workpiece fixing table 38 connects the guide hole 38b to the support table 34.
The workpiece fixing table 38 is fitted into the guide part 36 of the support table 34, and is attached to the upper part of the support table 34 by a guide bolt 44 that restricts the rising end of the workpiece fixing table 38. It is constantly pushed upward and is in a floating state. Note that the relationship between the surfaces 7c and 17c and the workpiece mounting surface 38a is parallel, and the relationship between the surfaces 7d and 17d and the workpiece mounting surface 38a is perpendicular.
The center line of 6 is perpendicular to the workpiece mounting surface 38a and the center line of surface 7
d, parallel to 17d. Also, surfaces 7c, 7d, 1
7c, 17d, and 38a are each perpendicular to the paper surface, and the center line of the guide portion 36 is parallel to the paper surface.
The phase determining pin 27 is attached to the phase determining pin support portion 39 of the workpiece fixing table 38 by a fixing plate 29 via a phase determining bolt 28 and a compression spring 30. Further, a gauge head holder 39a is provided on the upper surface of the phase determining pin support 39, and the gauge head 42a of the dial gauge 42 attached to the tip of the arm 37a of the dial gauge support 37 with a set bolt 43 is mounted on the gauge head holder 39a. It abuts from the perpendicular direction.

Next, the operation of the ball center measuring device of this embodiment will be explained. Similar to the first embodiment, the phase determining pin 2
7, the master M is fixed to the workpiece mounting surface 38a of the workpiece fixing table 38 with the fixing bolt 32. Since the support base 34 is pressed by the compression spring 31 and moved in the direction of the ball fixing base 13, the fixed ball 17 held by the ball mounting portion 14 and the movable ball 1 held by the movable base 7
1, the ball groove M2 of the master M comes into contact with the ball groove M2. Then, the positions of the hands on the dial gauge 20 and the dial gauge 42 at this time are read.

Next, after attaching the workpiece W to the workpiece fixing table 38 in the same manner as the master M was attached, fix the workpiece so that the needle of the dial gauge 20 is in the same position as the needle when the master M was set. The table 38 is moved in the vertical direction. In this case, if the center A of the ball groove W2 of the workpiece W is lower than the center O of the ball groove M2 of the master M by Δh as shown in FIG. In order to match the position of the needle when set, it is necessary to raise the workpiece W, or in other words, the workpiece fixing table 38, by Δh. In this way, when the workpiece fixing table 38 moves in the vertical direction, the amount of movement is read by the dial gauge 42, and the distance from the reference surface W1 of the workpiece W to the center A of the ball groove W2 is measured by the dial gauge of the master M. You can know directly by comparing it with the reading of 42.

FIG. 5 shows an embodiment of a ball center measuring device for an outer race of a constant velocity joint. This measuring device is basically the same as the ball center measuring device for the inner race. In this figure as well, the same components as in the first embodiment are given the same reference numerals.

In the figure, the upper portions of the side walls 3 and 4 of the base 1 are bent inwardly at approximately right angles to form support portions 50 and 51 of the outer race OR.
A base 1 is provided between both supporting parts 50 and 51.
A moving platform 52 is provided, which is slidably supported by an upper shaft 5 and a lower shaft 6.
The ball support portion 53 of this movable table 52 has both support portions 5
It protrudes upward from the upper surfaces of 0 and 51. The ball support part 53 is recessed in the shape of a groove on one side (left side in the figure) of its upper part to form a stepped part 53a.
The other side is arc-shaped. A fixed ball 17 is attached to a hole 54 provided in this arcuate portion so as to protrude outward from the arcuate portion. The ball support part 53 is located below the hole 54 and the upper shaft 5
A movable ball hole 55 is bored parallel to the axis of the movable ball hole 55, and the movable ball 11 is slidably inserted into the movable ball hole 55. Inside the movable ball hole 55, there is a spring receiver 56 on the inside of the movable ball 11. I am receiving power.
In addition, the ball support portion 53 outside the movable ball hole 55
A receiving plate 58 for regulating the amount by which the movable ball 11 protrudes from the movable ball hole 55 is attached to the surface. The spring receiver 56 has a small-diameter protrusion 56a on the opposite side from the receiving part of the movable ball 11.
A is a small hole drilled from the movable ball hole 55 in the direction of the stepped portion 53a of the ball support portion 53 to the stepped portion 53.
It protrudes toward the a side. At the stepped portion 53a of the ball support portion 53, a square-shaped measuring lever 59 whose one end abuts the tip of the protrusion 56a of the spring receiver 56 is attached to the support shaft 6.
It is pivoted by 0. A dial gauge 20 is attached to the tip of a support 61 attached to the upper part of the ball support section 53 by a set bolt 23. The tension spring 62 has one end attached to the ball support portion 53 and the other end attached below the support shaft 60 of the measuring lever 59, and acts to press the lower end of the measuring lever 59 against the protrusion 56a of the spring receiver 56. ing. In this way, the measuring tip 20b of the dial gauge 20 is in contact with the upper end of the measuring lever 59 whose lower end is pressed against the protrusion 56a of the spring receiver 56, and the movable ball 11 is pushed into the movable ball hole 55. When the measuring lever 59 is rotated clockwise about the support shaft 60, the measuring tip 20b of the dial gauge 20 is pushed in. Also,
Regarding the configuration of each part, the axes of the upper shaft 5, lower shaft 6, and movable ball hole 55 and the centers of the movable ball 11 and fixed ball 17 are on the same plane, and this plane and the upper surface of the support parts 50 and 51, that is, the workpiece mounting The plane is vertical. Furthermore, the support part 5
The upper surface of 0,51 is parallel to the axis of the upper shaft 5.

As described above, the movable base 52 has the movable ball 11 and the fixed ball 17 attached to the ball support part 53.
is pressed by the compression spring 10 and fixed to the upper support parts 50 and 51 of the base 1 by the positioning pin 63, so that the fixed ball 17 and the movable ball 11 are pressed against the ball groove OR1 of the outer race OR. There is.

The measurement of the ball center position of the outer race OR is carried out in the same manner as in the first embodiment.

FIGS. 6 and 7 show another embodiment of a device for measuring the position of a spherical center of a component 64 having a spherical shape. When mounting the component 64 at a measurement position where the component 64 does not have a ball groove, there is no need to determine its phase. Therefore, in FIG. 6, the phasing mechanism is removed from FIG. 1, and in FIG. 7, the phasing mechanism is removed from FIG. 4.

This invention consists of a workpiece fixing table for fixing a part having a flat reference surface and a spherical convex surface part or a spherical concave part, and a workpiece fixing table that can come into contact with the spherical convex part or spherical concave part of the part fixed to the workpiece fixing table. A fixed ball and a movable ball are held by a support member, and both balls are held at a predetermined distance in a direction perpendicular to a reference plane. Relative movement is possible between the two balls in a specific linear direction along the reference plane, and relative movement is also possible between both balls in the linear direction, and means is provided for measuring the amount of relative movement between the two balls. , by comparing the amount of relative movement between both balls measured by bringing both balls into contact with the specific part in the fixed state with the reference value of the amount of relative movement measured for a master part whose dimensions are known. Since it is now possible to know the distance between the spherical center position of the spherical convex surface part or spherical concave part and the reference surface in a specific part, measurement accuracy is improved compared to conventional methods, measurement time is shortened, and work is made easier. It can be used as a gauge for measuring in-process.

[Brief explanation of the drawing]

The figures show an embodiment of this invention. Fig. 1 is a cross-sectional front view of the main part showing an example of the use of the ball center measuring device, Fig. 2 is a longitudinal cross-sectional view of a master for the inner race of a constant velocity joint, and Fig. 3 is a An explanatory diagram when measuring the ball center of the inner race. FIG. 4 is a front view of an improved embodiment of FIG. 1. FIG. FIG. 7 is a sectional front view of a main part showing an example of use of still another spherical center-shaped measuring device. 1...base, 11...movable ball, 17...
Fixed ball, 20... Dial gauge, 24...
Workpiece fixing table, 38... Workpiece fixing table, M... Master, M1... Reference surface, W... Workpiece, W1...
…Reference plane.

Claims (1)

[Claims for Utility Model Registration] A workpiece fixing stand for fixing a part having a flat reference surface and a spherical convex surface portion or a spherical concave surface portion;
The fixed ball and the movable ball are held by a support member so as to be able to come into contact with the spherical convex surface portion or the spherical concave surface portion of the component fixed thereto, and both balls are held at a predetermined distance in a direction perpendicular to the reference plane. The workpiece fixing table and the support member for both balls can be moved relative to each other in a specific linear direction along the reference plane, and the balls can also be moved relative to each other in the linear direction. and a means for measuring the amount of relative movement between both balls, and the amount of relative movement between both balls measured by bringing both balls into contact with the specific component in the fixed state,
The distance between the spherical center position of the spherical convex part or spherical concave part of a specific part and the reference plane can be determined by comparing it with the reference value of the amount of relative movement measured for a master part whose dimensions are known. A ball center measurement device featuring: