JPH0772681B2 - Wide range inner diameter measurement method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a wide-range inner diameter measuring method, and more particularly to measuring a wide-range inner diameter of a workpiece by opening and closing a pair of movable members provided with contacts. The present invention relates to a wide range inner diameter measuring method capable of performing.

[Conventional technology]

A conventional wide-range inner diameter measuring device of this type is shown in FIG. 5 (Japanese Utility Model Laid-Open No. 60-25905).

This device includes movable members 2 and 2 arranged in a casing 1 so as to be openable and closable, contactors 3 and 3 and detectors 4 and 4 arranged on these movable members 2 and 2, and a piston rod 5A. First air cylinder 5 having a taper shaft 6 and a taper member 7
And a second air cylinder 6 having a collet 8 on the piston rod 6A.

When measuring the inner diameter with this device, first insert the tip of the casing 1 into the master, and then supply compressed air from the air supply port C into the second air cylinder 6 to return the piston rod 6A. And expands against the urging force of the spring 9 to remove the collet 8 from the taper shaft 6 to unclamp the piston rod 5A. In this unclamped state, compressed air is supplied from the air supply port A or B to the first air silling. 5, the piston rod 5A is expanded / contracted, and the movable member 2, 2 is opened / closed by the taper member 7. When the movable members 2 and 2 reach the required opening / closing positions, the supply of compressed air from the air supply port C is stopped, the piston rod 6A is retracted by the return spring 9, and the taper shaft 6 is clamped by the collet 8. This makes it possible to measure the inner diameter of the workpiece.

[Problems to be solved by the invention]

In the above-mentioned conventional measuring device, since the taper member 7 is moved back and forth by the first air cylinder 5, it is difficult to feed the taper member 7 minutely. Therefore, the open / close positions of the movable members 2 and 2, that is, the reference position for measuring the inner diameter. There was a problem that it took time to set up. Further, the position of the taper member 7, that is, the open / close position of the movable members 2 and 2 is fixed by the collet chuck. However, the fixing is not sufficient only by this collet chuck, and the taper member 7 moves to cause a measurement error. There was also a fear.

The present invention has been made in view of the above circumstances, and provides a wide range inner diameter measuring method that can finely feed a taper member that opens and closes the movable member and can also contribute to fixing the position of the taper member. The purpose is to provide.

[Means for solving problems]

In order to achieve the above object, the present invention provides at least a pair of movable members supported by a case so as to be openable and closable in a radial direction of an inner diameter to be measured, a contact elastically supported by the movable member, and the movable member. A detector for detecting relative displacement between the contact and the contact, a rod having a tip end with a taper member that abuts the inside of the pair of movable members, a rotary drive source, and a rotary screw of the rotary motion of the rotary drive source. Through a screw feed mechanism for converting the linear motion through the rod to move the rod forward and backward in the axial direction, and to open and close the pair of movable members by contact with the taper member, and to surround and tighten the periphery of the rod. And a collet member for releasing the clamp of the rod by loosening the rod, and a collet member movably arranged in the axial direction of the rod when the rod is moved in one direction. Includes a collar that fits into the collet member to tighten the collet member, and that loosens the collet member when moved in another direction, and a collar driving means that moves the collar in the axial direction of the rod. In the wide range inner diameter measuring method using the wide range inner diameter measuring device, the collar is moved by the collar driving means in the other direction of the axial direction of the rod to loosen the collet member and release the clamp of the rod by the collet member. , The rotation drive source is rotated, the rod is retracted in the axial direction by the screw feed mechanism, and the taper member that abuts against the pair of movable members is retracted, whereby the distance between the pair of movable members is minimized. Close the pair of movable members, insert the contactor into the master, reverse the rotation drive source, and rotate the screw drive mechanism. The movable member in the axial direction and the taper member that abuts against the pair of movable members is advanced to gradually open the integrated movable member so that the distance between the pair of movable members increases, and the contactor The collet member is brought into contact with the master by stopping the rotation of the rotary drive source when the detector outputs a signal indicating a zero point, and moving the collar in one of the axial directions of the rod by the collar driving means. Finish the master set by tightening and clamping the rod,
The contact diameter after the master is set is brought into contact with the measured inner diameter, and the relative deviation between the contact distance at that time and the contact distance when the master is measured is detected by the detector. It is characterized by measuring.

[Action]

According to the present invention, since the taper member that opens and closes the movable member is advanced and retracted by the screw feed mechanism, the taper member can be finely fed, and the rod provided with the taper member is connected to the rotary drive source side by the feed screw. Since they are screwed together, they do not move even if an axial force is applied to the rod when the rotation drive source side is stopped rotating.

〔Example〕

Hereinafter, preferred embodiments of a method for measuring a wide range inner diameter according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view showing an embodiment of a wide range inner diameter measuring apparatus to which the wide range inner diameter measuring method according to the present invention is applied. In the figure, a frame 12, a motor 14, an air cylinder 16 and the like are fixedly arranged in a cylindrical case 10. Further, in the frame 12, a pair of movable members 20, 20 are openably and closably supported by the case 10 via leaf springs 18, 18, and a movable member is provided between the movable members 20, 20 and the frame 12. 20, 20
Springs 22 are provided for urging the springs in the closing direction.

The movable members 20 and 20 are provided with detection coils 24A and 24A, and levers 26 and 26 are elastically supported via fulcrums 28 and 28. At the rear end, cores 24B and 24B moving in the detection coils 24A and 24A
Is provided, and contacts 30, 30 are provided at the tip.
The detection coils 24A, 24A and the cores 24B, 24B constitute differential transformer type detectors 24, 24.

On the other hand, a rod 36 is provided with a conical taper member 32 for opening and closing the movable members 20, 20 at the tip thereof, and a feed screw 34 is formed at the rear end thereof.
The frame 12 and the pair of movable members 20, 20 in the axial direction of
It is arranged through. Further, a nut member 38 screwed onto the feed screw 34 is attached to the rotary drive shaft 14A of the motor 14.
Is provided. The rod 36 can be moved in the axial direction by the rotation preventing member 40, but is prevented from rotating. Therefore, when the nut member 38 is rotated by the motor 14, the rod 36, which has the feed screw 34 screwed into the nut member 38 and is prevented from rotating, moves in the axial direction thereof and hits the taper member 32. It is possible to adjust the distance between the contacting pins 20A and 20A, that is, the distance between the movable members 20 and 20.

Further, a collet member 42 is arranged behind the frame 12, and a collar 44 for tightening the collet member 42 is arranged slidably in the axial direction of the rollo 36. The collar 44 is urged to the left in FIG. 1 by a return spring 46 provided between the frame 12 and the collar 44, and rods 48, 48 pressed by the piston 16A of the air cylinder 16 move the rod 44, It is designed to move to the right in FIG.

The collet member 42 has a slot 42A as shown in FIG. 2, and when it is not tightened by the collar 44, it unclamps the rod 36 as shown in FIG. And clamp rod 36.

Next, the case of changing the measurement diameter in the wide range inner diameter measuring device configured as described above will be described.

In this case, first, compressed air is supplied from the air supply port 16B of the air cylinder 16, and the collar 44 is moved to the right in FIG. 1 against the biasing force of the return spring 46 via the rods 48, 48,
The clamp of the rod 36 by the collet member 42 is released to allow the rod 36 to advance and retract in the axial direction.

Next, the motor 14 is rotated, and the rod 36 is fed by screw feeding.
Is moved forward so that the distance between the contacts 30, 30 is minimized, and the contacts 30, 30 are inserted into the master in this state.

Then, the motor 14 is rotated in the reverse direction and the rod is fed by screw feeding.
36 is retracted and the distance between the contacts 30, 30 is gradually increased. Then, the contacts 30, 30 contact the master, and its detector 24,
The rotation of the motor 14 is stopped when 24 outputs a signal indicating a zero point.

Finally, the supply of air to the air cylinder 16 is stopped. As a result, the collar 44 tightens the collet member 42 by the urging force of the return spring 46, and the rod 36 is clamped by the collet member 42 to be in a measurable state.

The measuring device master-set as described above detects the relative deviation between the master diameter and the distance between the contactors 30 and 30 contacting in the work by inserting the contactors 30 and 30 into the work. It can be detected by the devices 24, 24.

There are various mechanisms for moving the rod 36 forward and backward by screw feeding, and the mechanism is not limited to the above embodiment. For example, contrary to the mechanism shown in FIG. 1, the screw feed mechanism shown in FIG. 3 has the feed screw 50 arranged on the rotary drive shaft side of the motor and the nut on the rod 52 side provided with the taper member 32. The member 54 is arranged. Also in the case of this mechanism, means for locking the rod 52 side in a non-rotatable manner (for example, means for forming a key groove in the axial direction of the rod 52 and disposing a key for engaging with the key groove on the case side) Etc.) are required.

Further, in the screw feed mechanism shown in FIG. 4, the feed screw 62 is formed on the rod 60 having the taper member 32, and the nut member 64 screwed to the feed screw 62 is fixed to the case side.
The rod 60 is configured to rotate via spur gears 66 and 68. This screw feed mechanism is a rod 60
Since the taper member 32 also rotates, the taper member 32 needs to have a conical shape. However, in the case of the above-described screw feeding mechanism in which the rod does not rotate, it does not necessarily have to have a conical shape.

〔The invention's effect〕

As described above, according to the wide-range inner diameter measuring method of the present invention, since the rod having the taper member is advanced and retracted by the screw feeding mechanism to open and close at least the pair of movable members having the contactor, the fineness of the taper member is reduced. Feeding is possible, and master set can be easily and accurately performed when changing the measurement diameter. Further, since the rod having the taper member is screwed by the feed screw or the like, there is an advantage that the rod does not move when the rotary drive source side is stopped (during measurement).

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a wide range inner diameter measuring device to which the wide range inner diameter measuring method according to the present invention is applied, FIG. 2 is a perspective view of a collet chuck used in FIG. 1, FIG. FIG. 4 is a view showing another embodiment of the screw feeding mechanism, and FIG. 5 is a sectional view showing an example of a conventional wide range inner diameter measuring device. 10 …… Case, 14 …… Motor, 16 …… Air cylinder, 20
...... Movable member, 24 ...... Detector, 30 ...... Contactor, 32 ...... Taper member, 34 ...... Feed screw, 36 ...... Rod, 38 ...... Nut member, 40 ...... Rotation prevention member, 42 ...... Collet member, 44
… Color, 46… Return spring.

Claims (1)

[Claims] 1. A pair of movable members supported by a case so as to be openable and closable in a radial direction of an inner diameter to be measured, a contact elastically supported by the movable member, and a relative between the movable member and the contact. Detector for detecting dynamic displacement, a rod having a tip end with a taper member that abuts the inside of the pair of movable members, a rotary drive source, and a rotary motion of the rotary drive source is converted into a linear motion via a feed screw. A screw feed mechanism that transforms the rod to advance and retreat in the axial direction and opens and closes the pair of movable members by contact with the taper member, and surrounds the periphery of the rod and clamps the rod by tightening. And a collet member that releases the clamp of the rod by being loosened, and a collet member that is movably arranged in the axial direction of the rod and that moves in one direction. A wide-range inner diameter provided with a collar that fits the material and tightens the collet member, and loosens the collet member when moved in the other direction, and a collar driving means that moves the collar in the axial direction of the rod. In a wide range inner diameter measuring method using a measuring device, the collar driving means moves the collar in the other direction of the axial direction of the rod to loosen the collet member and release the clamp of the rod by the collet member. The pair of movable members is rotated so that the rod is retracted in the axial direction by the screw feeding mechanism, and the taper member that abuts against the pair of movable members is retracted so that the distance between the pair of movable members is minimized. Closed the movable member, insert the contact into the master, reverse the rotation drive source, and use the screw feed mechanism to move the rod to its axis. The pair of movable members are gradually opened so that the gap between the pair of movable members is widened by moving the taper member that is in contact with the pair of movable members forward and backward, and the contactor contacts the master. When the detector outputs a signal indicating the zero point, the rotation of the rotary drive source is stopped, and the collar is moved in one of the axial directions of the rod by the collar driving means to tighten the collet member to tighten the rod. The master set is completed by clamping, and the contact after master setting is brought into contact with the measured inner diameter, and the relative deviation between the contact interval at that time and the contact interval when measuring the master is measured. A wide-range inner diameter measuring method characterized by measuring the inner diameter to be measured by detecting with a detector.