JPH0653907U - measuring device - Google Patents

Abstract

(57) [Summary] [Purpose] The structure is simple and handling is simple, and
To provide a measuring device capable of highly accurate measurement. [Structure] A linear actuating body 5 that linearly operates in an axial direction is fitted into a cylindrical body 4 through a linear actuating bearing 6, and one end of the cylindrical body 4 is provided with a master gauge 1 having an accurate inner diameter. At least three contact bodies 8 contacting the inner surface of the hole 2;
The tubular body 4 is provided so as to be movable within a certain range only in a direction orthogonal to the central axis of the tubular body 4, and the tubular body 4 is provided at one end of the linear operating body 5.
Inside, a taper shaft portion 7 slidingly contacting the contact body 8 is concentrically provided continuously, and biasing means 12 for pressing the contact body 8 against the inner surface of the hole of the master gauge 1 through the taper shaft portion 7 is provided, and further contact An indicator 14 for detecting the amount of displacement of the body 8 is provided on the other end side of the tubular body 4 in association with the linear actuation body 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a measuring device for accurately measuring the inner diameter of a hole of a spindle, for example, when precision machining a spindle with a straight hole in a machine tool.

[0002]

[Prior art and its problems]

 Various devices have been conventionally known for measuring the inner diameter of a hole, but the conventional inner diameter measuring device requires a large-scale device and is troublesome to operate. It was not possible to make high measurements. An object of the present invention is to provide a measuring device which has a simple structure, is easy to handle, and can perform highly accurate measurement.

[0003]

[Means for Solving the Problems]

 In the measuring device of the present invention which can achieve the above object, a linear actuating body 5 which linearly operates in the axial direction is fitted into a cylindrical body 4 through a linear actuating bearing 6, and one end of the cylindrical body 4 is In the portion, at least three contact bodies 8 that come into contact with the inner surface of the hole 2 of the master gauge 1 having an accurate inner diameter are provided so that they can be displaced within a certain range only in the direction orthogonal to the central axis of the tubular body 4. A taper shaft portion 7 slidingly contacting the contact body 8 is concentrically connected to one end of the linear actuating body 5 in the tubular body 4, and the contact body 8 is connected to the master gauge through the taper shaft portion 7. 1. An urging means 12 for pressing the inner surface of the hole 1 is provided, and an indicator 14 for detecting the displacement amount of the contact body 8 is provided on the other end side of the cylindrical main body 4 in association with the linear actuation body 5. is there.

[0004]

【Example】

 An embodiment will be described with reference to the drawings. In FIGS. 1 and 2, 1 is a master gauge having a hole 2 whose inner diameter is accurately made, and 3 is a measuring device. The measuring device 3 has a tubular body 4, and a lower end portion (one end portion) of the tubular body 4 forms an enlarged tubular portion 4a which is loosely fitted in the hole 2 of the master gauge 1 in a contacted state. ing.

A linear actuating member 5 that linearly actuates in the axial direction is fitted into the cylindrical main body 4 via a linear actuating bearing 6 such as a linear bearing or a ball bearing, and a lower end portion of the linear actuating member 5 is fitted to the linear actuating member 5. The taper shaft portion 7 loosely fitted in the enlarged cylinder portion 4a at the lower end of the cylindrical body 4 is concentrically integrally connected to the linear actuation body 5. Further, three spherical contact bodies 8 contacting the inner surface of the master gauge 1 are attached to the enlarged cylindrical portion 4a at the lower end of the cylindrical main body 4 with respect to the tapered shaft portion 7 within the enlarged cylindrical portion 4a. It is provided so as to be movable within a certain range only in a direction orthogonal to the central axis of the cylindrical main body 4 in a sliding contact state.

As shown in FIG. 2, the three contact bodies 8 are arranged at intervals of 120 degrees in the circumferential direction, and each of the contact bodies 8 is arranged on the enlarged cylindrical portion 4 a in the radial direction thereof. It is slidably fitted in a through hole 9 that is provided through the through hole 9, and is fitted onto the enlarged tubular portion 4a while being supported by the contact body 8 from the inside of the enlarged tubular portion 4a. The cover body 10 is held so as to appropriately project outward from the opening 10a of the cover body 10. In addition, 11 is a holding member screwed to the lower end of the enlarged cylindrical portion 4a for fixing the cover body 10.

A coil spring 12 as a biasing means for pressing the contact body 8 against the inner surface of the hole 2 of the master gauge 1 through the tapered shaft portion 7 is provided in the enlarged cylinder portion 4 a of the cylindrical body 4. It is interposed between the portion 4a and the tapered shaft portion 7. Further, a stopper pin 13 for limiting the linear actuation body 5 to a certain linear operation range is provided in the cylindrical body 4 so as to penetrate in the direction orthogonal to the central axis of the cylindrical body 4, and the stopper pin 13 The tapered portion 13a at the tip is engaged with the large-diameter hole 5a having the same taper angle as this.

Further, on the upper end side of the cylindrical main body 4, an indicator 14 made of, for example, a dial gauge for detecting a displacement amount of the contact body 8 is provided. In this indicator 14, the stem portion 14a is fixed by penetrating the holding member 15 screwed onto the upper end of the tubular body 4, and the measuring terminal 14b is brought into contact with the upper end surface of the linear actuation body 5. It is installed in the state.

In using the measuring device 3 having the above-described structure, the lower end side of the device 3 is inserted into the hole 2 of the master gauge 1 concentrically, and the contact body 8 is brought into contact with the inner surface of the hole 2. Then, the pointer 14c of the indicator 14 at that time is adjusted to zero on the scale. After that, the measuring device 3 is inserted into an object to be measured whose inner diameter is slightly smaller than a predetermined dimension value, for example, a hole of a spindle of a machine tool, and the contact body 8 is brought into contact with the inner surface of the hole. The measured value of the indicator 14 is read.

In the measurement of the inner diameter of the main shaft, the contact body 8 shifts inward (in the direction toward the center axis) with respect to the direction orthogonal to the center axis of the tubular body 4, and The linear actuating body 5 integrated with the taper shaft portion 7 in sliding contact is actuated linearly upward in the axial direction against the urging force of the coil spring 12, and the pointer 14c of the indicator 14 shifts from zero to the contact body 8. The position that has changed by the amount corresponding to the amount is displayed. Therefore, if the inner surface of the spindle hole is ground so that the measured value of the indicator 14 becomes zero, when the measured value becomes zero, the inner diameter of the spindle hole has a predetermined accuracy.

In this case, if the taper angle of the taper shaft portion 7 is 2θ and the displacement amount of the contact body 8 is Δx, the measured value of the indicator 14 by this displacement amount Δx is 0 from the zero when the pointer 14 c. The measured value that is changed by the amount corresponding to Δx · cotθ will be displayed.

In the measuring device 3 described above, the linear actuation body 5 is fitted in the tubular body 4 via the linear actuation bearing 6 such as linear bearing so as to act linearly in the axial direction. The linear actuation body 5 does not cause rattling or eccentricity with respect to the cylindrical body 4 during the linear movement accompanying the displacement of the contact body 8, and the displacement amount of the contact body 8 can be more accurately measured on the indicator 14 side. The accuracy of the measurement can be improved.

In this embodiment, a sphere is used as the contact body, but the contact body is not limited to the sphere, and for example, the inner surface of the hole and the contact body may be in point contact with each other. It may be a cylindrical body whose both ends are spherical. Further, although the dial gauge is used as the indicator in the embodiment, an electric micrometer or other suitable one can be used. Further, by providing at least three contact bodies, it is possible to surely contact the inner peripheral surface of the hole of the object to be measured.

Further, in the embodiment, a ball bearing, a linear bearing, etc. are exemplified as the linear operation bearing, but in addition thereto, a precision processed metal bearing may be used. A coil spring is illustrated as an urging means that presses the contact body against the inner surface of the hole of the master gauge via the taper shaft portion of the linear actuating body. When used in a vertical shape, the linear actuating body may be biased downward in the axial direction by its own weight instead of using the coil spring.

[0015]

[Operation and effect of the device]

 In the measuring device of the present invention, one end of the device is inserted into the hole of the master gauge, the contact body is brought into contact with the inner surface of the hole, and the measured value of the indicator at that time is set to zero. So, for example, in the case of precision machining of the spindle hole of a machine tool, set this measuring device for the spindle in the same way as in the case of the master gauge, read the measured value of the indicator, and set the value to zero. If the inner surface of the spindle hole is ground as described above, when the measured value becomes zero, the inner diameter of the spindle will have a predetermined accuracy.

As described above, by using the measuring device of the present invention, the inner diameter of the object to be measured can be easily and easily measured. In particular, in the measuring device of the present invention, since the linear actuator is fitted in the cylindrical main body via the linear actuator bearing so as to linearly act in the axial direction, the linear actuator is displaced by the contact body. It does not cause rattling or eccentricity with respect to the cylindrical body during operation, and the displacement amount of the contact body is more accurately transmitted to the indicator side, which enables highly accurate inner diameter measurement. Therefore, holes such as the spindle can be machined with high precision. Furthermore, since this measuring device has a simple structure and can be configured compactly, it is extremely convenient for handling such as measuring work, carrying and storing, and can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a measuring device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1 Master Gauge 2 Master Gauge Hole 3 Measuring Device 4 Cylindrical Main Body 5 Linear Actuator 6 Linear Actuator Bearing 7 Tapered Shaft 8 Contact Body 12 Biasing Means (Coil Spring) 14 Indicator

Claims (1)

[Scope of utility model registration request] 1. An inner surface of a hole of a master gauge having a precise inner diameter, wherein a linear actuating member which linearly actuates in the axial direction is fitted into a cylindrical main body through a linear actuating bearing, and one end of the cylindrical main body has an accurate inner diameter. At least three contact bodies that come into contact with the cylindrical body are provided such that they can be displaced within a certain range only in a direction orthogonal to the central axis of the cylindrical body, and one end of the linear actuating body is connected to the contact bodies in the cylindrical body. A taper shaft portion that is in sliding contact is concentrically provided continuously, and a biasing means that presses the contact body against the inner surface of the hole of the master gauge through the taper shaft portion is provided. A measuring device that is provided on the other end side of the cylindrical body in association with the linear actuator.