JP2002277202A - End face accuracy measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce work man-hours required for measuring end face accuracy, improve measurement accuracy, an enable the in-line arrangement of a measuring process in a machining line. SOLUTION: The end face accuracy measuring device 1 is a device for measuring the accuracy of end faces 2a and 2 of a component to be measured 2 with a through hole 3 which intersects at right angles the end faces 2a and 2b to be measured. The end face accuracy measuring device 1 is provided with a measuring shaft 4 with cross-section dimensions smaller than those of the cross section of the through hole 3, a fixing means 9 protruded in the radial direction from the measuring shaft 4 inserted in the through hole 3 for bringing a side surface of the measuring shat 4 into close contact with the inner surface of the through hole 3 and fixing the component to be measured 2 to the measuring shaft 4, a rotating means 8 for rotating the measuring shaft 4 about its axis, and at least one sensor 10 and 11 for measuring variations along the axial direction of the end faces 2a and 2b of the rotating component to be measured 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an end face accuracy measuring apparatus and method for measuring the accuracy of an end face of a part to be measured such as a gear.

[0002]

2. Description of the Related Art In general, in order to measure the accuracy of a machined end face of a part to be measured such as a gear, first, a measurement shaft manufactured with high precision is fitted to the inner diameter of the gear. Then, both ends of the measurement shaft are sandwiched between a pair of centers disposed on the axis of the measurement shaft so as to face each other, and are supported rotatably around the axis. In this state, the sensor is brought into contact with one end face of the gear,
By rotating the measuring shaft around its axis,
Measure the deflection of the end face with respect to the inner diameter face.

[0003] Next, the gear is removed from the measuring shaft, and one end surface thereof is placed so as to be in contact with a fixed surface plate or a split projection jig whose height position is accurately set. The sensor is brought into close proximity and in contact. As the sensors, for example, three sensors accurately set so as to display the same reading at the same height are arranged in equal divisions (that is, every 120 °). By calculating the difference between the measurement values read by the three sensors, the parallelism and the accuracy of the width of the end face of the gear were measured.

[0004]

In the conventional measuring method described above, since the measuring shaft is fitted to the inner diameter of the gear,
It is necessary to provide a minute clearance for insertion between the inner diameter of the gear and the measuring shaft. However, if there is a clearance between the measurement shaft and the gear, even if it is a small clearance, play will occur at the time of measurement, resulting in poor centering and the inability to perform highly accurate measurement. There are inconveniences.

If the clearance between the measurement shaft and the gear is set to be extremely small in order to reduce the measurement failure due to the clearance, it becomes difficult to insert the measurement shaft into the inside diameter of the gear. Pressing work using a press device is required. Further, it is necessary to use a press device for the operation of removing the press-fitted gear from the measurement shaft. Therefore, preparation for measuring the end face accuracy of the gear requires a large number of man-hours.

[0006] In particular, unlike a grinding operation performed by firmly fixing a gear, in the case of honing processing performed in a floating state by engaging a gear with a fixing gear, 100% measurement is performed instead of sampling measurement. Need to do. For this reason, it is desired that the end face accuracy measurement step be incorporated in-line as part of the gear processing step. However, the conventional method requires a large number of man-hours for measurement, and the in-line measurement is required in the processing step. Was difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has an end face accuracy measuring apparatus capable of improving measurement accuracy, greatly reducing the number of man-hours required for measurement, and being able to be incorporated in-line in a machining process. And a measurement method.

[0008]

In order to achieve the above object, the present invention employs the following means. The present invention is an apparatus for measuring the accuracy of an end surface of a part to be measured having a through hole orthogonal to an end surface to be measured, and a measuring shaft inserted with a gap in the through hole, A fixing means for protruding in a radial direction from a measurement shaft provided, fixing a side surface of the measurement shaft to an inner surface of the through hole, and fixing the component to be measured to the measurement shaft; And an at least one sensor for measuring a variation of the end surface of the rotating component to be measured along the axial direction.

According to the end face accuracy measuring device according to the present invention, the measuring shaft inserted into the through hole of the component to be measured is inserted with a gap in the through hole, so that the inserting operation can be simplified without using a press device or the like. Can be done. Then, the side surface of the measurement shaft is brought into close contact with the inner surface of the through-hole by the operation of the fixing means projecting radially from the measurement shaft in the through-hole, so that there is no play between the measurement shaft and the part to be measured.

In this state, the sensor is brought into contact with or non-contact with the end face of the component to be measured, and by rotating the rotating means, the measuring shaft is rotated about its axis, whereby the through-hole of the component to be measured is provided. It is possible to accurately measure the deflection of the end surface accuracy of the component to be measured with respect to the inner surface.

Further, according to the present invention, in the end face accuracy measuring device, the side surface of the measuring shaft which is brought into close contact with the inner surface of the through hole has an outer diameter dimension equal to the inner diameter dimension of the through hole, and the circumferential direction of the measuring shaft is Consisting of at least two contact surfaces spaced apart from each other, said fixing means comprising:
An end face accuracy measuring device comprising a pressing means protruding in the radial direction to press the inner surface of the through hole radially outward at a position opposed to the contact surface with the axis of the measuring shaft interposed therebetween is proposed. are doing.

According to the end face accuracy measuring apparatus according to the present invention, the pressing means is operated in a state where the measuring shaft is inserted into the through hole of the component to be measured, so that the pressing means protrudes radially in the through hole. The inner surface of the through-hole is pressed in the radial direction halfway, so that the contact surface disposed at a position facing the pressing means that faces the measurement shaft across the axis thereof has a through hole facing the contact surface. It will be brought into close contact with the inner surface of the hole. Since the contact surface has an outer diameter dimension equal to the inner diameter of the through hole, the inner surface of the through hole moves so as to follow the contact surface, and the component to be measured aligns its axis with the axis of the measurement shaft. Alternatively, it is possible to fix the positioning state so that at least the axis of the measuring shaft and the axis of the component to be measured are parallel. Therefore, it is possible to measure the accuracy of the end face with high accuracy for the part to be inspected that is accurately fixed to the axis of the measurement shaft.

Further, according to the present invention, in the end face accuracy measuring device, the pressing means is a piston slidably disposed in a cylinder formed along a radial direction of the measuring shaft. Has been proposed. According to the end face accuracy measuring device according to the present invention, the above operation can be easily achieved by forming the pressing means by the piston.

That is, when the component to be measured is mounted on the measuring shaft, the piston is slid radially inward in a cylinder formed along the radial direction of the measuring shaft and retracted from the outer surface of the measuring shaft. Thereby, a sufficient gap is formed between the inner surface of the through hole of the component to be measured and the outer surface of the measuring shaft, and the insertion of the measuring shaft into the through hole can be facilitated. Further, when the component to be measured is fixed to the measurement shaft, the piston is slid radially outward in the cylinder to project the piston from the outer surface of the measurement shaft provided in the through hole. By pressing the inner surface of the through-hole radially outward with the tip, the side surface of the measuring shaft can be brought into close contact with the inner surface of the through-hole. Thus, the work of inserting the component to be measured into the measurement shaft can be facilitated, and the component to be measured can be fixed to the measurement shaft while being accurately positioned.

Further, according to the present invention, the measuring shaft may be
An end face accuracy measuring device supported by a pair of centers sandwiching both ends thereof, wherein the supply of the pressurized medium to the cylinder is performed through a supply hole penetrating the center and the measurement shaft in the longitudinal direction and communicating with the cylinder. Has been proposed.
According to the end face accuracy measuring device according to the present invention, by sandwiching both ends of the measuring shaft between the pair of centers, the measuring shaft is fixed in a positioning state with respect to the center, and at that time, the center is penetrated in the longitudinal direction. The formed supply hole is connected to a supply hole that penetrates the measuring shaft in the longitudinal direction and communicates with the cylinder. Therefore, the supply path of the pressurized medium to the cylinder can be configured only by connecting the center and the measurement shaft.

Further, according to the present invention, in the end face accuracy measuring apparatus, the sensors are arranged so as to face each other on a straight line parallel to the axis of the measuring shaft, and simultaneously measure fluctuations of both end faces of the part to be measured. We have proposed an end face accuracy measuring device. According to the end face accuracy measuring device according to the present invention, when the part to be measured is rotated around the axis of the measuring shaft, a pair of sensors for detecting the fluctuation of both end faces of the part to be measured,
Measure the end face accuracy at the same time. Thereby, the run-out of both end faces can be measured at the same time, and the end face parallelism and the end face width dimension between both end faces can also be measured.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an end face accuracy measuring apparatus according to the present invention will be described below with reference to the drawings.
As shown in FIG. 1, an end face accuracy measuring device 1 according to the present embodiment has measurement end faces 2 a and 2 of a gear 2 which is a part to be measured.
measuring shaft 4 inserted into a through hole 3 orthogonal to b
A pair of centers 5 and 6 arranged vertically so as to sandwich both ends of the measuring shaft 4, and a center elevating means 7 for vertically moving the upper center 6 of the pair of centers 5 and 6; Rotating means 8 for rotating the measuring shaft 4 about its vertical axis, provided on the measuring shaft 4;
Fixing means 9 for fixing the gear 2 and the measuring shaft 4
And the lower end face 2 of the measurement end faces 2 a and 2 b of the gear 2.
a, a first gauge 10 (sensor) that is brought into contact with a, a second gauge 11 that is brought into contact with the upper end surface 2b, a gauge elevating means 12 that moves the second gauge 11 (the sensor) in the vertical direction, A gear supporting means 13 for receiving the gear 2 fitted to the measuring shaft 4 on a lower side, and a gear supporting elevating means 14 for moving the gear supporting means 13 in the vertical direction are provided.

The measuring shaft 4 is mounted on a lower center 5 fixed vertically upward to a base 15 and a holder 16 is provided around the lower center 5 so as to be rotatable around a vertical axis. It is supported vertically upward. The holder 16 and the measuring shaft 4 are loosely fitted with a small gap therebetween, and the tip of a connecting bolt 17 that penetrates the holder 16 in the radial direction is formed on the peripheral surface of the measuring shaft 4. By engaging with the concave portions, they are fixed to each other in the rotation direction about the vertical axis. In the figure, reference numeral 18 denotes a housing, and reference numeral 19 denotes a measurement shaft guide, which are fastened to each other to form the holder 16.

The distal end of the measuring shaft 4 is disposed substantially vertically upward, and the tapered portion 20 gradually decreases in diameter toward the distal end, and a fitting portion 21 disposed below the tapered portion 20 for externally fitting the gear 2. Is provided. The cross-sectional shape of the fitting portion 21 of the measurement shaft 4 is, as shown in FIG.
Except for two contact surfaces 21a and 21b having the same outer diameter as the inner diameter of the through hole 3, the inner diameter of the through hole 3 is formed smaller than the inner diameter of the through hole 3. It is formed to have a cross-sectional dimension smaller than the dimension.

The fitting portion 21 of the measuring shaft 4 has
As shown in FIG. 6, two cylinders 22 pierced in the radial direction are provided in two places, and pistons 23a and 23b (pressing means) are respectively provided in the cylinders 22.
Are movably accommodated in the radial direction. Piston 23
a, 23b are always urged radially inward by a spring 25 sandwiched between a pressing plate 24 fixed to the opening of the cylinder 22. In this state, the pistons 23a, 23b The distal end is disposed in a state of being retracted inward in the radial direction. In the figure, reference numeral 26 denotes the piston 23
O-rings for sealing between a and 23b and the inner peripheral surface of the cylinder 22.

Two contact surfaces 21 of the measuring shaft 4
a, 21b and the two pistons 23a, 23b are respectively disposed at diametrically opposite positions with respect to the axis of the measuring shaft 4. In addition, the two contact surfaces 21a, 21
b and the two pistons are arranged at positions 23a and 23b, which are shifted from each other by 90 degrees around the axis of the measuring shaft 4. Thus, the pistons 23a, 23b and the opposing contact surfaces 21a, 21b constitute a fixing means 9 for fixing the gear 2 to the fitting portion 21 of the measuring shaft 4.

As shown in FIG. 1, a supply hole 28 is formed in the measuring shaft 4 along the longitudinal direction from the tip to the fitting portion 21. The supply hole 28 communicates with each of the cylinders 22 through a communication hole 29 as shown in FIG.

The lower center 5 of the pair of centers 5 and 6 is fixed vertically upward as described above, while the upper center 6 is arranged vertically downward and has It is fixed via a bracket 32 to a slider 31 mounted on a rail 30 fixed to the base 15 along the direction so as to be linearly movable in the vertical direction.

The upper center 6 is provided with a through hole 33 along its longitudinal direction.
Is opened at the downward end of the upper center 6, and is connected to the opening of the supply hole 28 provided in the measuring shaft 4 when it is brought into contact with the upper end of the measuring shaft 4. As shown in FIG. 5, each of the upper centers 6 is provided with a tapered tip that fits into a centering hole 34 provided at both ends of the measuring shaft 4 and a contact portion 35 with the measuring shaft 4. Is made of a material that reduces friction with the measurement shaft 4 or has high wear resistance.

The through hole 3 provided in the upper center 6
An air pressure source (not shown) is connected to 3, and pressurized air supplied from the air pressure source can be discharged from the opening at the end of the upper center 6 through the through hole 33. .

The center elevating means 7 is, for example, a cylinder 37 having a rod 36 which can move up and down in the vertical direction. The cylinder 37 is fixed to the base 15 and the tip of the rod 36 is attached to the bracket 32. . Thus, by operating the cylinder 37, the upper center 6 can be moved up and down in the vertical direction.

The rotating means 8 includes, for example, a motor 38 having a rotating shaft rotatable around a vertical axis,
8 and a driven gear 40 fixed to the holder 16. In the figure, reference numeral 41
Is a bearing for rotatably supporting the holder 16.

The first gauge 10 is fixed to a bracket 42 attached to the base 15, and its measuring end 10 a faces vertically upward, near the lower end of the fitting portion 21 of the measuring shaft 4. Are located.
Thus, when the gear 2 is inserted into the fitting portion 21 of the measurement shaft 4, the measurement end 10 a of the first gauge 10 can be brought into contact with the lower measurement end surface 2 a in the width direction of the gear 2. Has become.

The second gauge 11 is fixed via a bracket 44 to a slider 43 mounted on a rail 30 for guiding the upper center 6 up and down. The second gauge 11 has its measuring end 11a directed vertically downward,
The measurement end 10a of the first gauge 10 is arranged on the same vertical line as the measurement end 10a, and when the slider 43 is moved in the vertical direction, the measurement end 11a is moved up and down.

The gauge elevating means 12 is, for example, a cylinder 46 having a rod 45 which can move up and down in the vertical direction. The cylinder 46 is fixed to the base 15 and the tip of the rod 45 is attached to the bracket 44. .
Thus, by operating the cylinder 46, the second gauge 11 can be moved up and down in the vertical direction.

The gear supporting means 13 is circumferentially spaced around the measuring shaft 4 (for example, 120
It is provided with three receiving pins 47 arranged upward (every °) (only one receiving pin 47 is shown in the figure). The receiving pin 47 is fixed to a slider 49 via a bracket 48, and the slider 49 is supported by a vertically arranged rail 50 so as to be able to move vertically. Also, three receiving pins 47
Are set to be arranged in the same horizontal plane.

The gear support raising / lowering means 14 is, for example, a cylinder 52 having a rod 51 which can move up and down in the vertical direction. The cylinder 52 is fixed to the base 15 and the tip of the rod 51 is attached to the bracket 48. I have. Thus, by operating the cylinder 52, the receiving pin 47 can be moved up and down in the vertical direction.

The operation of the end face accuracy measuring apparatus 1 according to this embodiment having the above-described configuration will be described below. In order to measure the accuracy of the end faces 2a and 2b of the gear 2 by the end face accuracy measuring device 1 according to the present embodiment, first, as shown in FIG.
Activate 2 Specifically, by supplying pressurized air from a pneumatic pressure source (not shown) to the rods 36 and 45 of the cylinders 37 and 46, the rods 36 and 45 are retracted upward. Thereby, the brackets 32, 44 attached to the tips of the rods 36, 45 are moved upward while being guided by the sliders 31, 43, and the brackets 31, 4 are moved upward.
The center 6 and the second gauge 11 fixed to 3 will be moved upward.

Further, the receiving pin 47 is raised by operating the gear support raising / lowering means 14. In particular,
By supplying pressurized air to the head side of the cylinder 52 from an air pressure source (not shown), the rod 51 of the cylinder 52 is
Is moved upward, and the three receiving pins 47 are raised via the bracket 48 supported by the slider 49. At this time, the tip of the receiving pin 47 is arranged so as to be slightly lower than the measuring end 10a of the first gauge 10.

In this state, the fitting portion 21 of the measuring shaft 4
The upper end and the upper center 6 and the second gauge 11 are vertically separated from each other, and the gear 2 is connected between them by the measuring shaft 4.
A sufficient gap is formed to fit the fitting portion 21 outside. Therefore, the operator or manipulator
As shown by the arrow in the figure, the gear 2 can be fitted into the fitting portion 21 of the measuring shaft 4 from above through the gap.

In this state, since the pressurized air is not supplied to the supply hole 28 formed in the fitting portion 21 of the measurement shaft 4, the supply hole 28 is arranged in the cylinder 22 formed in the measurement shaft 4. Pistons 23a and 23b are
It is urged radially inward by a spring 25 disposed between the pressing plate 24 and the holding plate 24. Therefore, the fitting portion 21
Is formed to be sufficiently smaller than the cross-sectional dimension of the through hole 3 of the gear 2, and when it is externally fitted from above the fitting portion 21, a gap is formed over the entire circumference, and extremely loose fitting is achieved. It can be easily fitted. In particular, the fitting portion 2
Since the one end is provided with the tapered portion 20 whose diameter decreases toward the end, the outer fitting of the gear 2 to the fitting portion 21 can be performed extremely easily.

When the gear 2 is externally fitted to the fitting portion 21, the measuring end surface 2a disposed below the gear 2 has three receiving pins 4a.
7, the measurement end 10a of the first gauge 10 is disposed at a position higher than the horizontal plane on which the tips of the three receiving pins 47 are disposed. Of the first gauge 10 is supported at a position where it comes into contact with the three receiving pins 47 at the same time while the gear 2 is slightly pressed down by its own weight. Become. That is, the first gauge 10 is brought into a measurable state by slightly depressing its measuring end 10a. Also, at this point,
The reading of the first gauge 10 is zero if the measuring end 2a of the gear 2 is manufactured as designed without error.

Next, as shown in FIG. 3, the center elevating means 7 and the gauge elevating means 12 are operated to lower the upper center 6 and the second gauge 11. Specifically, pressurized air is supplied to the head side of the cylinders 37 and 46 to extend the rods 36 and 45 downward, and
The upper center 6 and the second gauge 11 fixed to the brackets 32 and 44 are lowered by moving the brackets 32 and 44 connected to the leading end 45 vertically downward by the guidance of the sliders 31 and 43 and the rail 30. Let it. Center elevating means 7 and gauge elevating means 12
Need not be operated at the same time, and the center elevating means 7 may be operated after the gauge elevating means 12 is operated.
In addition, if the mutual operation can be restrained by changing the arrangement of the brackets 32 and 44 as shown in FIG. 3, the operation order and the operation speed may be arbitrary.

By operating the center elevating means 7 in this manner, the tip of the upper center 6 is moved to the measuring shaft 4.
Are fitted into the centering hole 34 formed at the tip of the fitting portion 21 by bringing their tapered surfaces into close contact with each other. As a result, the measurement shaft 4 is sandwiched between the pair of centers 5 and 6 from above and below, so that its axis is aligned with the centers of the centers 5 and 6. In this state, the through hole 33 formed in the center 6 is connected to the supply hole 28 formed in the fitting portion 21 of the measuring shaft 4 in an airtight state. In this state, the second gauge 1
As shown in FIG. 3, the first measuring end 11a has not yet come into contact with the upper measuring end surface 2b of the gear 2.

In this state, by supplying pressurized air from a pneumatic pressure source (not shown) to the through hole 33 of the center 6, the pressurized air is fitted through the supply hole 28 connected to the through hole 33 and the communication hole 29. Cylinder 2 formed in joint 21
2 by pressing the pistons 23a and 23b radially outward against the urging force of the spring 25,
The distal ends of the pistons 23a and 23b are projected outward in the radial direction. Thereby, when the tip of the pistons 23a and 23b presses the inner surface of the through hole 3 of the gear 2 radially outward, and the gear 2 is moved in the radial direction, it is opposite to the pistons 23a and 23b with the axis interposed therebetween. On the side of the contact surfaces 21a and 21b arranged on the side, the inner surface of the through hole 3 of the gear 2 is moved inward in the radial direction, so that the contact surfaces 21a and 21b are moved.
a, 21b and the inner surface of the through hole 3 are brought into close contact with each other.

Since the contact surfaces 21a and 21b have the same outer diameter as the inner surface of the through hole 3, the gear 2 is used when the inner surface of the through hole 3 is brought into close contact with the contact surfaces 21a and 21b. The posture of the measurement shaft 4 is changed by following the axis of the measurement shaft 4 so as to match the axis. Also, the contact surface 2
1a and 21b are arranged at 90 ° apart in the circumferential direction, so that the contact surfaces 21a and 21b of the fitting portion 21 which are the side surfaces of the measuring shaft 4 are formed on the inner surface of the through hole 3 at two places separated in the circumferential direction. The gear 2 is rotated by rotating the gear 2 around two axes (X and Y in FIG. 6) that intersect each other and respectively intersect with the axis of the measurement shaft 4 by bringing them into close contact with each other. The gear 2 can be fixed to the measuring shaft 4 so that the axis of the gear 2 completely coincides with the axis of the gear 2.

In this state, as shown in FIG. 4, the gear support elevating means 14 is operated to lower the receiving pin 47. As a result, the tip of the receiving pin 47 is separated from the measurement end face 2 a of the gear 2, but does not drop because the gear 2 is fixed to the fitting portion 21 of the measurement shaft 4 by the operation of the fixing means 9. .

Then, in this state, the gauge elevating means 7 is further operated to lower the measuring end 11a of the second gauge 11 to make contact with the upper measuring end surface 2b of the gear 2.
Also in this case, similarly to the case of the first gauge 10, the measuring end 11a of the second gauge 11 is further lowered by a predetermined distance after coming into contact with the measuring end face 2b, so that the measuring end 11a of the gauge 11 It is pushed up by a predetermined distance and is placed in a measurement state. At this time, if the measurement end face 2b of the gear 2 is manufactured as designed without error, the reading of the second gauge 11 also becomes zero, and
The distance from the measuring end 10a of the gauge 10 is set apart from the measuring end face 2a, 2b of the gear 2 by the designed width dimension.

Thus, the gear 2 is attached to the measuring shaft 4.
With the first and second gauges 1 attached
When the measuring ends 10a, 11a of the gears 0, 11 are brought into contact with the two measuring end faces 2a, 2b of the gear 2, the rotating means 8 is operated. That is, when the motor 38 operates,
The drive gear 39 and the driven gear 40 rotate in conjunction with each other, and the holder 16 that fixes the driven gear 40 is rotated, whereby the measurement shaft 4 is rotated around the vertical axis through the connection bolt 17.

When the measuring shaft 4 is rotated, the gear 2 attached to the fitting portion 21 of the measuring shaft 4
Is rotated about a vertical axis, and the accuracy of the end face is measured by the gauges 10 and 11 that are in contact with the upper and lower measurement end faces 2a and 2b of the gear 2. For example, by measuring the readings of the gauges 10 and 11 at a speed of 1000 points / second while keeping the rotation speed of the motor 38 constant, the measurement end faces 2a and 2b are continuously measured over the entire circumference, and each point is measured. The end face deflection and the end face parallelism can be inspected from the fluctuation range of each reading, and the end face width dimension can be inspected from the difference between the readings at each point of the end face accuracy.

When the measurement is completed in this manner, the operation of the gauge elevating means 12 causes the second gauge 1 to move.
1 is raised, and the receiving pin 47 is raised by the operation of the gear support raising / lowering means 14 and comes into contact with the measurement end surface 2 a of the gear 2.
In this state, when the supply of the pressurized air to the fixing means 9 is stopped, the pistons 23a and 23b retract radially inward, and the gear 2 is released from the measurement shaft 4, and
A gap occurs between the gear 2 and the fitting portion 21.

Thereafter, the upper center 6 is raised by the operation of the center elevating means 7, and a space is provided above the measuring shaft 4, so that the gear 2 can be taken out from the measuring shaft 4, and the operator or the manipulator can be taken out. As a result, the gear 2 is taken out.

As described above, according to the end face accuracy measuring device 1 according to the present embodiment, the gear 2 is moved to the measuring shaft by projecting the pistons 23a and 23b from the measuring shaft 4 in the radial direction inside the through hole 3 of the gear 2. 4, the gear 2 can be fixed to the measurement shaft 4 with high accuracy while ensuring a sufficient clearance for fitting the gear 2 to the measurement shaft 4. Moreover, by ensuring a large fitting gap, the operation of attaching the gear 2 to the measurement shaft 4 can be performed extremely easily, and the number of operation steps can be reduced.

Therefore, since the number of steps of the mounting operation is reduced, it is possible to perform an inspection of all the gears 2, and the inspection process of the gears 2 can be performed in-line in the processing line. As a result, the quality can be surely confirmed even with a processing method in which the quality tends to vary, such as the inner diameter honing, and the outflow of defective products can be prevented.

In the above embodiment, a pair of gauges 1
0 and 11 are arranged to face each other, but instead of this,
Either the upper or lower gauge may be arranged. Instead of this, a plurality of gauges may be arranged vertically. Further, the sensor for detecting the fluctuation of the end face has been described using the contact type gauges 10 and 11 as an example. However, the present invention is not limited to this, and other sensors of the contact type or any of the contact type can be used. A sensor may be employed.

The lifting means 7, 12, 14 are all constituted by the cylinders 37, 46, 52. However, the invention is not limited to this, and any driving means equivalent to this can be adopted. Further, the pistons 23a, 2
Although the supply of the pressurized air to 3b is performed from the upper center 6, it may be performed from the lower center 5 instead.

The structure of the rotating means 8 is not limited to the above embodiment. Further, the structure including the pistons 23a and 23b and the contact surfaces 21a and 21b has been described as an example of the fixing means 9, but is not limited thereto. In particular, although the two contact surfaces 21a and 21b are arranged at positions separated by 90 °, they may be arranged at positions separated by another arbitrary angle.

Although the pneumatically driven pistons 23a and 23b are employed as the pressing means, any other actuator, for example, a solenoid, may be employed instead. Furthermore, the gear 2 having the through-hole 3 has been described as an example of the part to be inspected, but instead of this, any other to-be-measured part having the through-hole 3 orthogonal to the measurement end faces 2a and 2b in the width direction is used. It goes without saying that the present invention can be applied to measurement of parts.

[0054]

As is clear from the above description, the present invention has the following effects. (1) Since the cross-sectional dimension of the measuring shaft on which the component to be measured is externally fitted is smaller than the cross-sectional dimension of the through-hole, the fitting operation between the two is easy, and the side surface of the measuring shaft is formed by operating the fixing means. Since it is brought into close contact with the inner surface, there is no play between the fixed measuring shaft and the part to be measured. Therefore, there is an effect that highly accurate end face accuracy measurement can be performed while facilitating the mounting operation. (2) Also, since the two contact surfaces spaced apart in the circumferential direction are brought into close contact with the inner surface of the through-hole, the component to be measured is rotated around two axes that cross each other and cross the axis of the measurement shaft. The axis of the part to be measured can be reliably aligned with or at least parallel to the axis of the measuring shaft. As a result, there is an effect that the measurement of the end face accuracy with high accuracy can be performed. (3) By configuring the pressing means with a piston, positioning of the component to be measured on the measurement shaft can be performed extremely simply and quickly. Therefore, there is an effect that the number of steps required for the mounting operation can be reduced and the measuring process can be installed in-line on the processing line. (4) The measurement shaft is supported by the pair of centers, so that the measurement shaft can be easily positioned. Further, if the pressurized medium is supplied by the supply hole penetrating the center and the measuring shaft in the longitudinal direction, the pressurized medium can be easily supplied to the piston on the rotating measuring shaft. (5) By arranging the gauges on the same straight line so as to measure both end faces of the part to be measured at the same time, not only the deflection of the end faces, but also a plurality of types of end faces such as parallelism of the end faces and end face width dimensions. There is an effect that the accuracy can be measured simultaneously.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an end face accuracy measuring device according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a state before a component to be measured is attached to the end face accuracy measuring device of FIG. 1;

FIG. 3 is a longitudinal sectional view showing a state where a part to be measured is attached to the end face accuracy measuring device of FIG. 1 and a measuring shaft is sandwiched between centers.

FIG. 4 is a longitudinal sectional view showing a measurement state in which a pair of gauges are brought into contact with both end faces of a part to be measured attached to the end face accuracy measuring device of FIG.

FIG. 5 is a longitudinal sectional view illustrating a fixing means provided on the measurement shaft.

FIG. 6 is a cross-sectional view illustrating the fixing means of FIG.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 end face accuracy measuring device 2 gear (measured part) 2a, 2b measuring end face (end face) 3 through hole 4 measuring shaft 5 lower center (center) 6 upper center (center) 8 rotating means 9 fixing means 10 upper gauge (sensor) 11) Lower gauge (sensor) 21a, 21b Close contact surface (side surface) 22 Cylinder 23a, 23b Piston (pressing means) 28 Supply hole 29 Communication hole (supply hole) 33 Through hole (supply hole)

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Claims (5)

[Claims] 1. An apparatus for measuring the accuracy of an end face of a part to be measured having a through hole orthogonal to an end face to be measured, comprising: a measuring shaft having a smaller cross-sectional dimension than the cross section of the through hole; Fixing means for protruding in the radial direction from the measuring shaft inserted into the measuring shaft, fixing the side surface of the measuring shaft to the inner surface of the through-hole, and fixing the component to be measured to the measuring shaft; An end face accuracy measuring device comprising: a rotating means for rotating around a center; and at least one sensor for measuring a variation of the end face of the rotating measured object along the axial direction. 2. A side face of the measurement shaft which is brought into close contact with an inner surface of the through hole, has at least two outer diameters equal to the inner diameter of the through hole, and is arranged at intervals in a circumferential direction of the measurement shaft. A pressing means which comprises a contact surface, wherein the fixing means is protruded in the radial direction at a position opposed to the contact surface with the axis of the measurement shaft interposed therebetween, and presses the inner surface of the through hole radially outward. 2. The end face accuracy measuring device according to claim 1, further comprising: means. 3. The end face accuracy measuring device according to claim 2, wherein said pressing means is a piston slidably disposed in a cylinder formed along a radial direction of said measuring shaft. 4. A supply in which the measuring shaft is supported by a pair of centers sandwiching both ends of the measuring shaft, and a supply of the pressurized medium to the cylinder communicates with the cylinder through the center and the measuring shaft in a longitudinal direction. The end face accuracy measuring device according to claim 3, wherein the measurement is performed through a hole. 5. The sensor according to claim 1, wherein the sensors are arranged so as to face each other on a straight line parallel to the axis of the measuring shaft, and simultaneously measure fluctuations at both end faces of the component to be measured.
The end face accuracy measuring device according to any one of the above.