JPH08334302A - Dimension measuring instrument - Google Patents

Abstract

PURPOSE: To automatically change, in a short time, the setting due to change of a measuring object. CONSTITUTION: The dimension measuring instrument is provided with a main block 4 and a subblock 8. The main block 4 is provided with a reference measuring object 22 and a mating measuring object 21 whose dimension is larger than the reference measuring object 22, and guided by a guide rod 3 movably forward and backward. The subblock 8 is movable relative to the main block 4, and linked with it by being pressed and biased in the direction away from the main block 4. A contact shoe 13 is fixed to the subblock 8. When the main block is moved and the contact shoe 13 comes into contact with the mating measuring object 21, the main block 4 is fixed. In this state, the contact shoe 13 is brought into contact with the reference measuring object 22, and the zero point reference value of a differential transformer 23 is adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dimension measuring apparatus capable of automatically performing a setup change due to a change of a measuring object in a short time and capable of measuring the dimension of a measuring object in a wide range.

[0002]

2. Description of the Related Art Conventionally, there is a dimension measuring apparatus using a differential transformer for detecting a dimension difference from a reference measurement object as a reference dimension as shown in FIG. This one is
As shown in FIG. 7, a contact 102 that comes into contact with the object to be measured W is attached to one end of a measuring arm 101 that is pivotally mounted around a pivot 100, and a core 104 of a differential transformer 103 is attached to the other end of the measuring arm 101. Two sets of the attached measurement device main body 105 are slidably attached to the measurement head 107. The distance between the pair of measuring device main bodies 105 can be adjusted by the feed screw 106.

With such a structure, a differential transformer detects a difference in dimension with respect to a reference object to be measured, and when the object to be measured changes, the feed screw 106 is provided so that the distance between the side measuring device main body 105 is equal to that of the differential transformer. An operator adjusts the zero point of the differential transformer by using a reference measurement object after the operator adjusts the position so that it is located approximately in the middle of the detection range.

[0004]

In recent years, in the processing process, the mass production of a single product has been changed from the mass production of a large number of products, and the kind of the measurement object W has been frequently changed. For this reason, when the dimension measuring device as described above is used, the operator changes the type of the measured object, so that the operator uses the reference measuring object 1 for measuring the device main body 1
The interval 05 must be changed, which not only increases the burden on the worker, but also causes a decrease in operating rate.

In view of the above, an object of the present invention is to make it possible to automatically perform a setup change accompanying a change of a measurement object in a single time.

[0006]

The present invention has been made in order to solve the above-mentioned conventional problems, and comprises a reference measurement object and an alignment measurement object having a size larger than the reference measurement object. A main block guided by a guide member to be movable back and forth, and relatively displaceable to the main block,
And a sub-block, which is connected by pressing and urging in a direction away from the main block, to which a contact is attached,
Main block moving means for moving the main block to bring the contact into contact with the mating measured object, and main block fixing means for fixing the main block at a moving position of the main block where the contact piece contacts the mating measured object. And a detecting means for detecting relative displacement between the main block and the sub block, and after fixing the main block by the main block fixing means, a contactor is brought into contact with the reference object to adjust the reference value of the detecting means. And an adjusting means.

[0007] Further, a work table placed in parallel on the base, a reference measurement object, a measurement object having a size larger than the reference measurement object, and the work table on a column fixed on the base table. , A workpiece holder provided above the reference measurement object and the alignment measurement object so as to be movable in the parallel direction and the vertical direction of the reference measurement object and the alignment measurement object, and a measuring machine body provided with a pair of dimension measuring instruments, The dimension measuring device is connected to a main block guided by a guide member so as to be able to move forward and backward, and to be relatively displaceable with respect to the main block by pressing and biasing in a direction away from the main block, and a contactor is attached. A sub block, a main block moving means for moving the main block to bring the contact into contact with the mating measured object, and a movement of the main block in which the contact contacts the mated measured object. Main block fixing means for fixing the main block in place, a detecting means for detecting the relative displacement of the main block and the sub block, and a contactor is brought into contact with the reference object after fixing the main block by the main block fixing means. And adjusting means for adjusting the reference value of the detecting means.

[0008]

According to the structure of claim 1, a contact measuring object corresponding to the maximum allowable dimension of the object to be measured (workpiece) is set on the contact, and the main block is moved forward so that the contact becomes the contact measuring object. When contact is made, the main block is fixed by fixing means. In this state, the adjusting means replaces the matching measurement object with the reference measurement object, brings the contact into contact with the reference measurement object, and adjusts the reference value of the detection means by the reference measurement object.

According to the second aspect of the invention, the workpiece is set on the workpiece holder, the measuring machine body is aligned and moved onto the workpiece, and the workpiece comes between the first and second contacts. And the main block is fixed by the fixing means when the first and second contacts are brought into contact with the object to be measured by the main block moving means. After that, the main body of the measuring machine is moved up and moved on the reference measurement object to be lowered, the first and second contactors are brought into contact with the reference measurement object by the main block moving means, and the reference means of the detection means by the reference measurement object by the adjusting means. Adjust the value. After adjusting the reference value of the detection means, the measuring machine main body is moved up, moved onto the workpiece on the workpiece holder and moved down, and the contactor is brought into contact with the workpiece to measure the machining diameter of the workpiece. To do.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a dimension measuring instrument body, and a bracket 2 is fixed to a housing 1a of the dimension measuring instrument body 1. A guide rod 3 is fixed to the bracket 2, and a linear ball guide 5 is attached to the guide rod 3.
The main block 4 is slidably guided via.

The main block 4 guided by the guide rod 3 is also slidably guided by a guide pin 6 fixed to the bracket 2 by an axis parallel to the guide rod 3. Fitted on the pin 6,
A pressing spring 7 interposed between the bracket 2 and the main block 4 constantly presses and urges in the forward direction to the right in FIG.

Inside the housing 1a, a sub block 8 is provided on the side of the main block 4. The sub-block 8 has a leaf spring 9 on the main block 4.
The guide rod 3 with respect to the main block 4
Is coupled so as to be relatively displaceable in a direction substantially parallel to.

The sub block 8 is configured to regulate the opening side and the closing side of the separation distance from the main block 4 by a stopper mechanism. This stopper mechanism is shown in Figure 3.
As shown in FIG. 4, one end is fixed to the main block 4, the other end is inserted into a through hole formed in the sub block 8 and the flange 18 a engages with the sub block 8. And a closing regulation stopper 20 which is fixed to the sub block 8 and faces each other at a constant interval. Further, a contact pressure spring 19 is interposed between the main block 4 and the sub block 8 on the side of the opening regulating stopper 18 to urge the sub block 8 in a direction of separating from the main block 4.

Between the main block 4 and the sub block 8, there is provided a differential transformer 23 (detection means) including a core and a coil for detecting the distance between the main block 4 and the sub block 8. That is, the main block 4 has a fixed coil, and the sub block 8 has a fixed core that moves forward and backward in the coil.

One end of a support shaft 11 that extends slidably through the wall surface of the housing 1a along the axis parallel to the guide rod 3 and extends to the outside of the housing 1a is fixed to the sub-block 8, and the outside of the housing 1a is fixed. Support shaft 11 extending to
A contact 13 is attached to the other end of the arm via an arm 12.

A through hole 15 parallel to the axis of the guide rod 3 is formed above the guide portion of the main block 4 by the guide rod 3, and the main block fixing means of the main block 4 is provided in the through hole 15. Has been.

This main block fixing means has a through hole 1
5, a collet 17 fixed to the housing 1a is provided in the front end side of the piston 5, and a piston rod 1 that moves forward into the rear end side of the through hole 15 and taper-fits into the collet 17.
6 is fitted. The piston rod 16 is formed with a large diameter portion 16a, and the large diameter portion 16a is engaged with the main block 4 which is constantly biased by the pushing spring 7 in the forward direction to the right in FIG. ing.

An operating means (main block operating means) for moving the piston rod 16 forward and backward is provided outside the housing 1a. This actuating means is an actuator 14 such as an air cylinder, a hydraulic cylinder or an electromagnetic cylinder.

In FIG. 1, reference numeral 13a is a contact facing the contact 13 and is attached to the arm 12a. The contactor 13a is attached with the same mechanism as the dimension measuring device main body 1 via the connecting bracket 16 and the arm 12a to form a pair of contactors 13, 13a.

Further, as shown in FIG. 2, the dimension measuring device is provided with an alignment measurement object 21 (alignment gauge) and a reference measurement object 22 (master gauge) having known dimensions. The combined measurement object 21 corresponds to the maximum allowable diameter of the measurement object (workpiece) (within the detection range of the differential transformer) and has a larger diameter dimension than the reference measurement object 22. The matching measurement object 21 and the reference measurement object 22 are supported in parallel on the support member 24.

The alignment measurement object 21 is a plurality of alignment measurement objects 21a, 21 having different diameters depending on the type of the measurement object (workpiece).
b, and the reference measurement object 22 is also the combined measurement object 21.
A plurality of reference measurement objects 22a corresponding to the types of a and 21b,
22b.

The operation of the dimension measuring device having the above configuration will be described. First, the pair of contacts 13 and 13a are brought into contact with the mating measurement object 21, and the main block 4 is fixed when the contacts 13 and 13a come into contact with the mating measurement object 21.
That is, in the original position shown in FIG.
Is pressed by the contact pressure spring 19 in the direction away from the main block 4, and the separation distance is restricted by the opening restricting stopper 18. In such a state, the actuator 14 causes the piston rod 16
Forward (to the right in FIG. 1).

The forward movement of the piston rod 16 engages with the large diameter portion 16a of the piston rod 16. The main block 4 follows the movement of the large-diameter portion 16a of the piston rod 16 by the pressing of the pushing spring 7, and is guided by the guide rod 3 to move forward.

By the forward movement of the main block 4, the sub-block 8 is moved forward integrally with the main block 4 via the leaf spring 9, and the contacts 13, 13 via the support shaft 11.
a contacts the measured object 21. When the contacts 13 and 13a come into contact with the alignment measurement object 21, the forward movement of the sub block 8 is stopped, and the main block 4 is closed and the stopper 2 for regulating is closed.
It moves forward until it contacts 0, and then stops. The piston rod 16 further advances, taper-fits into the collet 17, expands the collet 17 in the radial direction, and stops. As a result, the collet 17 is pressed against the through hole 15 of the main block 4 to fix the main block 4. This combined measurement object 2
The maximum allowable diameter is set by fixing the main block 4 by 1.

After fixing the main block 4, the contacts 13 and 13a are brought into contact with the reference measurement object 22 which is a master gauge. This is because the reference measurement object 22 is the matching measurement object 21.
Since the diameter is smaller than that of the contact measuring object 21, the contact pressure spring 19 provided at the position of the opening restricting stopper 18 is released when the contacts 13 and 13a are separated from the measurement object 21 having a large diameter.
Due to the pressing force in the direction away from the main block 4, only the sub-block 8 is displaced in the forward direction away from the closing regulation stopper 20 and the contacts 13 and 13a come into contact with the reference measurement object 22.

The contacts 13, 13a are the reference measurement object 22.
When it comes into contact with, the reference value of the detection means is adjusted, that is, the zero point of the differential transformer 23 is adjusted, and the setup change is completed.

When the measurement object (workpiece) in which the zero point adjustment of the differential transformer 23 is performed is changed to another kind of measurement object (workpiece) having a different diameter, for example, the alignment measurement object 21a and the reference measurement object. The zero point adjustment of the differential transformer 23 is performed from 22a to the zero point adjustment of the differential transformer 23 so as to correspond to the measurement object (workpiece) changed by performing the above-described operation on the matching measurement objects 21b and 22b. The automatic setup change is possible.

Next, an embodiment using the above dimension measuring apparatus will be described with reference to FIGS. 4 and 5. Reference numeral 30 denotes a base, on which a work rest 33, a reference measurement object 22, and an alignment measurement object 21 having a size larger than the reference measurement object 22 are arranged in parallel. The reference measurement object 22 and the alignment measurement object 21 are supported in parallel with the support member 24, and are fixed on the installation table 31 via the support member 24, and the workpiece holder 33 is mounted on the base table 30. It is fixedly mounted on a moving table 32 which is slidably mounted in the front-rear direction and is operated by a cylinder 34.

A tailstock 35 for positioning and holding the workpiece W (measurement object) set on the workpiece holder 33.
And a tailstock cylinder 36 for operating the tailstock 35.

A horizontal girder 38 is fixedly installed above the base 30 through a column 37, and the guide rail 4 is attached to the horizontal girder 38.
The slider 39 is guided via 0 to be movable laterally. The slider 39 is traversed by the ball screw 42 rotated by the transverse feed motor 41 on the workpiece holder 33, the reference measurement object 22, and the alignment measurement object 21 on the base 30.

On the vertical surface of the slider 39, the measuring machine main body 43
Is attached to the measuring machine main body 43, and two sets of the dimension measuring machine main body 1 of the present invention having the above-described configuration are paired to be movable up and down by a lifting cylinder 44.

In the dimension measuring apparatus having the above-mentioned structure, the work stand 33 is pulled out forward through the moving stand 32, the work W (measurement object) is set on the work stand 33, and the moving stand 32 is moved backward. The tailstock 35 is positioned and held by the tailstock 35. As shown in FIG. 4, the measuring machine main body 43 is provided at one end of the cross beam 38 on the side of the reference measurement object 22 and the alignment measurement object 21 so as not to interfere with the loading and unloading of the workpiece W when the workpiece W is loaded and unloaded. positioned.

After the work W has been carried in, the size measuring device main body 1 descends to bring the contact pieces 13 and 13a into contact with the mating measurement object 21 to fix the main block 4 as described above, and then measure the size once. The measuring device main body 1 is moved up to shift the measuring device main body 43 so as to correspond to the reference measuring object 22, and the dimension measuring device main body 1 is lowered again to bring the contactors 13 and 13a into contact with the reference measuring object 22. Perform zero adjustment of 23.

After the zero adjustment of the differential transformer 23, the dimension measuring instrument body 1 is raised, the measuring instrument body 43 is shifted onto the workpiece W, and the dimension measuring instrument body 1 is lowered to move the workpiece W. The dimensional difference between the differential transformer 23 and the reference measurement object 22 is measured by bringing the contactors 13 and 13a into contact with the outer diameter of the.

When the work W is changed, the alignment measurement object 21 and the reference measurement object 22 corresponding to the changed work W are measured.
The above-mentioned operation is performed by and the setup change is automatically performed for the dimension measurement of the changed workpiece W.

In the above embodiment, a pair of the dimension measuring device main body 1 is provided so that the object W to be measured can be attached to the contactors 13 and 13a.
The measurement is performed by sandwiching between the two, but the measurement is not limited to this, and as shown in FIG.
The measurement object W placed at a predetermined position may be measured by.

[0037]

As described above, according to the dimension measuring device of the present invention, the setup change of the measurement reference value due to the change of the object to be measured can be automatically obtained in a short time, resulting in an increase in cost and an increase in size of the device. No, improve the utilization rate.

[Brief description of drawings]

FIG. 1 is a sectional view of a dimension measuring device main body of a dimension measuring device according to an embodiment of the present invention.

FIG. 2 is a front view of a combined measurement object and a reference measurement object.

FIG. 3 is a sectional view taken along line AA of FIG.

FIG. 4 is a front view of the dimension measuring device according to the present embodiment.

FIG. 5 is a side view of the dimension measuring apparatus according to the present embodiment.

FIG. 6 is a sectional view of a dimension measuring device according to another embodiment.

FIG. 7 is a sectional view of a conventional dimension measuring device.

[Explanation of symbols]

 1 Dimension Measuring Device Main Body 3 Guide Rod 4 Main Block 7 Pushing Spring 8 Sub Block 9 Leaf Spring 13 Contact 14 Actuator 16 Piston Rod 17 Collet 21 Matching Measured Object 22 Reference Measured Object 30 Base 33 33 Work Stand 38 Horizontal Girder 39 Slider 43 Measuring machine body

Claims (2)

[Claims] 1. A main block, which comprises a reference measurement object and an alignment measurement object having a size larger than that of the reference measurement object, is guided by a guide member to be movable back and forth, and is relatively displaceable to the main block. And a sub-block, which is pressed and biased in a direction away from the main block and is connected to the contactor, and a main block moving means for moving the main block to bring the contactor into contact with the measurement object. A main block fixing means for fixing the main block at a moving position of the main block where the contactor comes into contact with an object to be measured; a detecting means for detecting a relative displacement between the main block and the sub block; Adjusting means for adjusting the reference value of the detecting means by bringing the contact into contact with the reference object after fixing with the block fixing means A dimension measuring device comprising: 2. A work rest placed in parallel on a base,
A reference measurement object and an alignment measurement object having a size larger than that of the reference measurement object, and a work table above the workpiece holder, the reference measurement object and the alignment measurement object on a column fixedly mounted on the base.
The main body of the measuring machine, which is provided so as to be movable in the parallel direction and the vertical direction of the reference measurement object and the alignment measurement object and has a pair of dimension measuring instruments, and the dimension measuring instrument is guided by a guide member so as to be movable back and forth. A main block, a sub-block which is connected to the main block so as to be relatively displaceable, and which is pressed and biased in a direction away from the main block, and to which a contact is attached, and the main block is moved to move the contact. A main block moving means for bringing the main block into contact with the alignment measurement object, a main block fixing means for fixing the main block at a movement position of the main block where the contactor contacts the alignment measurement object, and a relative position between the main block and the sub block. After fixing the main block with the detection means for detecting displacement and the main block fixing means, the contactor is brought into contact with the reference object. To have an adjustment means for adjusting the reference value of said detecting means Te dimension measuring apparatus according to claim.