JPH06129936A - Collet chuck for balance measurement - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] It is easy to replace the claw part with the center shaft due to damage to the claw part or production model conversion, and the unbalance of rotation caused by the replacement can be electrically corrected. Provide a balance measuring collet chuck that fits within the range. [Structure] In a balance measuring collet chuck of a rotation balance measuring machine, the screwing portion of the claw portion 1 is eliminated, and the outer diameter of the claw side portion of the claw portion 1 is set to the inner diameter of the rotary shaft hole 5 ′ of the DUT 5. And the end portion of the claw portion 1 on the side opposite to the claw side is held by the rotation base 4 so as to be removable in the axial direction in common with the rotation axis core. A biasing means 3 is provided for biasing the pawl portion 1 in the direction of separating the pawl portion 1 from the tapered portion 2 '.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary balance measuring machine for measuring the rotary balance of various parts, and more particularly to a rotary shaft hole of an object to be measured placed on a rotary base of the rotary balance measuring machine in common with a rotary shaft core. The present invention relates to a collet chuck for balance measurement, which is inserted into a fixing base to fix an object to be measured to the rotary base.

2. Description of the Related Art Rotational balance measuring machines have been used to measure the rotational balance of various parts for a long time.
With the progress of miniaturization and precision of various parts, rotational balance measuring machines are required to have higher measurement accuracy. In addition, in the rotation balance measuring machine corresponding to the production of various kinds of parts, in order to match the outer diameter of the balance measuring collet chuck with the rotary shaft hole of the measured object every time the type is changed, the balance measuring collet Since the chuck needs to be replaced, replacement work is easy and
There is a demand for a balance measuring collet chuck that does not require readjustment of the balance of the rotational balance measuring machine after replacement. The structure and operation of a conventional example of this balance measuring collet chuck will be described with reference to FIGS. In FIG. 3, a belt 30 is rotatably supported by a bearing 29 and
An object to be measured 25 is placed on a rotary base 24 which rotates by means of a rotary shaft hole 25 ′ of the object to be measured 25, and a claw portion 21 screwed to the rotary base 24 by a screw 23.
Has been inserted. The claw portion 21 has a tapered portion 2
The central shaft 22 having 2'is inserted, and the tapered portion 2
2'contacts the tapered portion 21 'of the claw portion 21. The lower end of the central shaft 22 is connected to a piston 26 in a cylinder 27 by a connecting portion 28.
As the central axis 22 moves up and down by the pressure of the air passing through the air passage 32, and the central axis 22 moves downward, as shown in FIG. The taper portion 21 'of the claw portion 21 divided into three by the direction dividing groove is spread and the spread claw portion 21 is closely fitted into the rotary shaft hole 25' of the object to be measured 25, and the object to be measured is The measurement object 25 is fixed on the rotation base 24. In this state, the rotation base 24 is rotated by the belt 30, and the sensor 31 detects the vibration generated by the imbalance of the measured object 25 due to the rotation, and the vibration of the measured object 25 is detected from the vibration. Measure the balance. In this case, an electrical correction mechanism built in the rotation balance measuring machine for an unbalanced amount of rotation of the rotation base 24 in a state where the object to be measured 25 is not placed is
The rotation base 24 is measured based on the unbalance amount measured by the sensor 31 in advance and the object 25 to be measured is placed.
Is electrically subtracted from the unbalanced amount of rotation to perform electrical correction, and the unbalanced amount of the DUT 25 is detected.

However, in the configuration of the above-mentioned conventional example, the inner diameter of the rotary shaft hole 25 'of the object to be measured 25 is different due to the change of the production model, and the claw portion 21 is adapted to the different inner diameter. And the central shaft 22 are replaced, or when the claw portion 21 is damaged and the claw portion 21 is replaced, the connecting portion 2
8 and remove the central shaft from the rotary base 24, and screw 2
3 must be removed to remove the pawl portion 21 from the rotary base 24, but the screw 23 must be removed to reattach the pawl portion 21 to the rotary base 2.
Not only is the work of screwing to 4 difficult, but the radius from the axis of rotation of the rotation balance measuring machine to the screwed portion of the claw portion 21 is large due to the screwed portion, and therefore the radius of rotation of the claw portion 21 is Rotational inertia increases, and the claw portion 21
Misalignment of the rotation base 24 has a great influence on the rotation balance of the rotation base 24, and the rotation unbalance of the rotation base 24 after replacement due to the positional deviation caused by the gap between the claw portion 21 and the rotation base 24 in the screwed portion. Of the rotation base 24 after replacement, since
The mechanical correction is necessary to keep the rotational unbalance within the electric correction possible range, and this mechanical correction requires a long time, so the operating rate of the manufacturing line is reduced and the model conversion is more productive. There is a problem that it becomes a factor that hinders improvement. INDUSTRIAL APPLICABILITY The present invention solves the above-mentioned problems, makes it easy to replace the claw part with the central shaft by breaking the claw part or changing the production model, and can electrically correct the unbalance of the rotation of the rotation base due to the replacement. An object is to provide a collet chuck for balance measurement that falls within the range.

In order to solve the above-mentioned problems, a balance measuring collet chuck of the present invention has an outer diameter which is screwed to a rotary base of a rotary balance measuring machine in common with a rotary shaft core and is expandable. A cylindrical claw portion and a central shaft having a tapered portion that is inserted through the claw portion in common with the rotary shaft core and reciprocates in the axial direction to enlarge or cancel the outer diameter of the claw portion from the inside. Having, by inserting the claw portion through the rotary shaft hole of the measured object placed on the rotation base of the rotation balance measuring machine, the outer diameter of the claw portion is enlarged by the axial movement of the central axis, The claw portion is closely fitted to the rotary shaft hole of the DUT, the DUT is fixed on the rotary base to perform balance measurement, and the claw portion is enlarged by moving the central axis in the opposite direction. Balance measurement to release the object to be measured In the collet chuck for use, the claw portion screwing portion is eliminated, and the claw side portion of the claw portion has an outer diameter substantially equal to the inner diameter of the rotary shaft hole of the object to be measured. A direction in which an end portion on the opposite side is held by the rotation base so as to be detachable in the axial direction in common with the rotation axis core and between the central shaft and the pawl portion, and the pawl portion is separated from the tapered portion of the central shaft. Is provided with an urging means for urging the claw portion.

The function of the collet chuck for balance measurement of the present invention is as follows.
The above configuration has the following effects. Since the conventional screw-fastening part with a large turning radius is removed from the claw part, and the outer diameter of the claw part is made approximately equal to the inner diameter of the rotating shaft hole of the DUT,
Since the radius of rotation of the claw part with respect to the rotary shaft core becomes smaller and the inertial rate of rotation of the claw part with respect to the rotary shaft core also becomes smaller, there is a gap between the claw part and the rotary base when inserting the claw part into the rotary base. Even if the attachment of the claw part to the rotation base slightly deviates from the axis of the rotation shaft due to the positional shift caused, the influence on the rotation unbalance of the rotation base is small, and the rotation unbalance of the entire rotation base is within the electrically correctable range. Fits in. Therefore, it becomes unnecessary to mechanically correct the unbalance after replacement when replacing the claw portion and the central shaft. Also, from the state in which the tapered portion of the central shaft pushes the tapered portion of the claw portion to expand the outer diameter of the claw portion, the central axis is moved in a direction to cancel the enlargement of the outer diameter of the claw portion to move the claw portion. When releasing the enlargement of the outer diameter of the, instead of separating the pawl from the taper of the central shaft by screwing the pawl to the rotation base to prevent the pawl from moving, the pawl does not come between the central shaft and the pawl. In order to increase the outer diameter of the tapered portion, the urging means for urging the pawl portion in the direction of separating the pawl portion from the tapered portion of the central shaft fitted in the tapered portion of the pawl portion is provided. Since it is not necessary to screw the part to the rotation base, screwing the claw part is not required, and the work of replacing the claw part is simplified.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction and operation of one embodiment of a balance measuring collet chuck of the present invention will be described with reference to FIGS. In FIG. 1, an object to be measured 5 is rotatably supported by a bearing 9 and is rotated by a belt 10 on a rotary base 4.
Is placed, and the claw portion 1 is inserted into the rotary shaft hole 5 ′ of the DUT 5. The side opposite to the claw side of the claw portion 1 has a bottom portion 13 having a bottom portion, and the bottom portion 13 is provided with an insertion hole 14, and the insertion hole 14 has a central shaft 2 having a tapered portion 2 '. Is inserted from the claw side of the claw portion 1, and the tapered portion 2 ′ is in contact with the tapered portion 1 ′ of the claw portion 1. A step 2 ″ under the tapered portion 2 ′ of the central shaft 2
And a spring 3 is attached between the bottom 13 and the spring 3.
Contacts the tapered portion 2 ′ of the central shaft 2 and the tapered portion 1 ′ of the pawl portion 1 and separates them from each other, and constantly urges the pawl portion 1 toward the rotation base 4. or,
The bottom portion 13 is provided on the side opposite to the claw side of the claw portion 1 and the fitting portion 15 is formed, and the concave portion 17 provided in the rotary base 4 holds the common rotary shaft core in a detachable manner in the axial direction. The pins 16 are positioned on the rotation base 4 and stopped in the rotation direction. The lower end of the central shaft 2 is connected to a piston 6 in a cylinder 7 by a connecting portion 8. When the piston 6 moves up and down by the pressure of air passing through an air passage 12, the central shaft 2 moves up and down, By moving downward,
As shown in FIG. 2, the tapered portion 2'expands the tapered portion 1'of the claw portion 1 divided into three by axial dividing grooves (not shown), and the expanded claw portion 1 covers the covered portion. Measured object 5
The object to be measured 5 is fixed on the rotary base 4 by closely fitting in the rotary shaft hole 5 ′. In this state, the belt 10
The rotation base 4 is rotated by the
The vibration generated by the imbalance of the DUT 5 due to the rotation is detected, and the balance of the DUT 5 is measured from the vibration. In this case, the unbalanced amount of rotation of the rotary base 4 in a state in which the measured object 5 is not placed is preliminarily measured by the sensor 11 by the electrical correction mechanism incorporated in the rotational balance measuring machine, and the measured object is measured. The unbalanced amount of the rotation of the rotation base 4 is electrically subtracted from the unbalanced amount measured by mounting 5 to perform electrical correction, and the unbalanced amount of the DUT 5 is detected. When removing the claw portion 1 and the central shaft 2 of this embodiment, the central shaft 2
The central shaft 2 can be easily removed by turning the connection part 8 by turning, and the claw part 1 can be easily removed together with the spring 3 in the axial direction by removing the central shaft 2. When attaching the claw 1 and the central shaft 2, the claw 1 is positioned by the pin 16 and inserted into the recess 17, and then the spring 3 is inserted into the claw 1 and further the central shaft 2 is inserted. Then, it can be rotated and connected to the piston 6 through the connecting portion 8, and removal and mounting can be performed by simple work. And, as described in the section of the action, the mechanical correction for the unbalance is not required.

In the conventional balance measuring collet chuck, the claw portion has a screwing portion and is screwed to the rotation base of the rotary balance measuring machine, and the claw portion may be damaged or may be damaged. If the claws need to be replaced due to the change, not only is it troublesome to replace the claws by removing the screws, but also the rotation radius of the claws is large and the rotation inertia is large. Since the change in the balance of the base exceeds the range that can be electrically corrected, it is necessary to perform a troublesome mechanical correction, and it is necessary to perform a troublesome mechanical correction. The balance measuring collet chuck of the present invention does not have a screw part on the claw part, so not only is the claw part replaced easily,
Since the turning radius of the claw is small and the rotational inertia is small, the change in the balance of the rotation base before and after replacing the claw falls within the electrically correctable range, and the change in balance is detected by the electrical balance built into the rotation balance measuring machine. You can easily correct with the correction mechanism,
Since there is no need for troublesome mechanical correction, it is possible to replace the claw portion without lowering productivity.

[Brief description of drawings]

FIG. 1 is a collet chuck 1 for balance measurement according to the present invention.
It is sectional drawing of the rotation balance measuring machine which uses an Example.

FIG. 2 is an operation diagram of the collet chuck of FIGS. 1 and 3.

FIG. 3 is a sectional view of a rotational balance measuring machine using a conventional balance measuring collet chuck.

[Explanation of symbols]

 1 Claw 1'Tapered part 2 Central axis 2'Tapered part 2 "Stepped part 3 Spring (biasing means) 4 Rotation base 5 Object to be measured 5'Rotation shaft hole 6 Piston 7 Cylinder 8 Connection part 9 Bearing 10 Belt 11 Sensor 12 Air Passage 13 Bottom 14 Insertion Hole 15 Fitting 16 Pin 17 Recess

Claims (1)

[Claims] 1. A cylindrical claw portion having an expandable outer diameter, which is screwed to a rotation base of a rotation balance measuring machine in common with a rotation axis core, and is reciprocatively moved in the axial direction by being inserted into the claw section in common with the rotation axis core. By having a central shaft having a tapered portion for expanding or canceling the expansion of the outer diameter of the claw portion from the inside,
The claw portion is inserted through the rotation shaft hole of the object to be measured placed on the rotation base of the rotation balance measuring machine, and the outer diameter of the claw portion is enlarged by moving the central axis in the axial direction. The object to be measured is closely fitted into the hole of the rotary shaft to fix the object to be measured on the rotary base for balance measurement, and the enlargement of the claw portion is released by moving the central axis in the opposite direction. In the balance measurement collet chuck for releasing the object to be measured, while eliminating the screw fixing portion of the claw portion,
The outer diameter of the claw side portion of the claw portion is made substantially equal to the inner diameter of the rotary shaft hole of the object to be measured, and the claw side end of the claw portion opposite to the claw side is made common to the rotary shaft core and An axially detachable holding member is provided between the central shaft and the claw part, and a biasing means is provided between the central shaft and the claw part for biasing the claw part in a direction of separating the claw part from the tapered part of the central shaft. Collet chuck for balance measurement.