JP6726117B2 - Work size measuring device - Google Patents

Description

The present invention relates to a work size measuring device.

Regarding a conventional work size measuring device, for example, Japanese Patent Application Laid-Open No. 59-27203 discloses an object to enable a highly accurate and highly reliable measurement by a simple adjustment with respect to a change in size of a work piece. That is, a general-purpose outer diameter measuring device is disclosed (Patent Document 1).

In the general-purpose outer diameter measuring device disclosed in Patent Document 1, the workpiece is brought into contact with the V groove with the V groove forming the angle 2α as a reference. A pair of tracing stylus is provided in a direction orthogonal to the center line of the V groove. By moving the reference position of the tip of the tracing stylus along a line in the direction of the angle θ having a relationship of sin α=tan θ, the tracing stylus can be easily set according to the change in the diameter of the workpiece.

JP-A-59-27203

As disclosed in Patent Document 1 described above, there is known a device that measures the outer diameter of a work by disposing the work between a pair of facing stylus heads. In such a measuring device, a value smaller than the original outer diameter value is measured unless the pair of measuring elements are accurately positioned on both sides of the work center. That is, the positioning accuracy between the work and the pair of measuring elements has a great influence on the measurement accuracy of the work dimension.

On the other hand, there are cases where the dimensions of a plurality of workpieces are continuously measured, such as when the measuring device is incorporated in a machining line and the dimensions of the workpiece after machining are automatically measured. In such a case, it is difficult to position the work piece with good reproducibility with respect to the measuring device, and thus the measurement accuracy of the work piece size may decrease.

Therefore, an object of the present invention is to solve the above-mentioned problems, and to provide a work size measuring device having excellent work size measuring accuracy.

A work size measuring apparatus according to one aspect of the present invention includes a first measuring element that is in contact with a work and a second measuring element that is arranged so as to face the first measuring element with the work interposed therebetween and that is in contact with the work. The work part and the measuring part are arranged in a direction orthogonal to the direction in which the first measuring part and the second measuring part face each other while bringing the measuring part having the measuring part and the first measuring part and the second measuring part into contact with the work. And a moving mechanism section that relatively moves the. The measuring unit further includes a distance detecting unit that detects a distance between the first and second measuring elements that changes with relative movement between the work and the measuring section. The work size measuring device further includes a control device that specifies the maximum value or the minimum value of the distance between the first and second measuring elements from the detection result of the distance detecting section as the size of the specific portion of the work. The control device specifies the initial value of the distance between the first and second measuring elements when the first and second measuring elements contact the work. The controller continues the measurement when the distance between the first probe and the second probe increases from the initial value due to the relative movement between the work and the measurement unit, and the relative movement between the work and the measurement unit. When the distance between the first probe and the second probe decreases from the initial value due to the movement, the measurement is stopped. The control device specifies the maximum value of the distance between the first probe and the second probe as the size of the specific part of the workpiece from the detection result of the distance detector.
A work dimension measuring apparatus according to another aspect of the present invention is a second measurement element which is arranged to face a first measurement element which is in contact with a work and a second measurement element which is opposed to the first measurement element with the work interposed therebetween. The work part and the measuring part are arranged in a direction orthogonal to the direction in which the first measuring part and the second measuring part face each other while bringing the measuring part having the measuring part and the first measuring part and the second measuring part into contact with the work. And a moving mechanism section that relatively moves the. The measuring unit further includes a distance detecting unit that detects a distance between the first and second measuring elements that changes with relative movement between the work and the measuring section. The work size measuring device further includes a control device that specifies the maximum value or the minimum value of the distance between the first and second measuring elements from the detection result of the distance detecting section as the size of the specific portion of the work. The control device specifies the initial value of the distance between the first and second measuring elements when the first and second measuring elements contact the work. The controller continues the measurement when the distance between the first probe and the second probe decreases from the initial value due to the relative movement between the work and the measurement unit, and the relative movement between the work and the measurement unit. When the distance between the first probe and the second probe increases from the initial value due to the movement, the measurement is stopped. The control device specifies the minimum value of the distance between the first probe and the second probe as the size of the specific part of the work from the detection result of the distance detector.
A workpiece dimension measuring apparatus according to yet another aspect of the present invention is a workpiece contacting device, comprising: a first measuring element to be brought into contact with the workpiece; The work part and the measuring part are arranged in a direction orthogonal to the direction in which the first and second measuring parts are opposed to each other while the first measuring part and the second measuring part are in contact with the measuring part having two measuring parts. And a moving mechanism section that relatively moves the and. The measuring unit further includes a distance detecting unit that detects a distance between the first and second measuring elements that changes with relative movement between the work and the measuring section. The work size measuring device further includes a control device that specifies the maximum value or the minimum value of the distance between the first and second measuring elements from the detection result of the distance detecting section as the size of the specific portion of the work.

According to the workpiece dimension measuring device configured as described above, the maximum value or the minimum value of the distance between the first probe and the second probe that changes with the relative movement of the workpiece and the measuring unit is identified. Since it is specified as the size of the portion, excellent work size measurement accuracy can be obtained regardless of the accuracy of the positional relationship between the work and the first and second measuring elements.

Further preferably, the work size measuring device further includes a base member having a mounting surface on which the work is mounted. The moving mechanism section relatively moves the workpiece and the measuring section in a direction orthogonal to the direction in which the first and second measuring elements face each other and parallel to the mounting surface.

According to the workpiece dimension measuring device configured as described above, the maximum value of the distance between the first and second measuring elements that changes with the relative movement of the workpiece and the measuring unit in the direction parallel to the mounting surface. Alternatively, the minimum value is specified as the size of the specific part of the work.

Further preferably, the first and second measuring elements each have a convex surface that projects toward the work, and include a contact portion that abuts against the work at its tip.

According to the workpiece dimension measuring device configured as described above, the measurement accuracy of the workpiece dimension can be prevented from being influenced by the positional relationship between the first and second measuring elements and the foreign matter interposed between the measuring element and the workpiece. Can be suppressed.

Further preferably, the control device specifies the initial value of the distance between the first and second measuring elements when the first and second measuring elements are brought into contact with the work. The controller continues the measurement when the distance between the first probe and the second probe increases from the initial value due to the relative movement between the work and the measurement unit, and the relative movement between the work and the measurement unit. When the distance between the first probe and the second probe decreases from the initial value due to the movement, the measurement is stopped. The control device specifies the maximum value of the distance between the first probe and the second probe as the size of the specific part of the workpiece from the detection result of the distance detector.

Further preferably, the control device specifies the initial value of the distance between the first and second measuring elements when the first and second measuring elements are brought into contact with the work. The controller continues the measurement when the distance between the first probe and the second probe decreases from the initial value due to the relative movement between the work and the measurement unit, and the relative movement between the work and the measurement unit. When the distance between the first probe and the second probe increases from the initial value due to the movement, the measurement is stopped. The control device specifies the minimum value of the distance between the first probe and the second probe as the size of the specific portion of the work from the detection result of the distance detector.

According to the workpiece dimension measuring device configured as described above, the maximum value of the distance between the first and second probes, which is specified as the dimension of the specific portion of the workpiece, even though the measurement of the workpiece dimensions is continued. Alternatively, it can be avoided that there is no minimum value. As a result, the measurement efficiency of the work size can be improved.

Further, preferably, the reference dimension value of the specific portion of the work is input to the control device. The control device specifies the initial value of the distance between the first and second measuring elements when the first and second measuring elements contact the work. The control device, if the difference between the initial value and the reference dimension value is less than or equal to the preset predetermined value, continues the measurement, and the difference between the initial value and the reference dimension value is the preset predetermined value. If it exceeds, the measurement is stopped.

According to the workpiece dimension measuring device having such a configuration, it is possible to obtain a maximum value or a minimum value of the distance between the first and second measuring elements specified as the dimension of the specific portion of the work at an early stage. As a result, the measurement efficiency of the work size can be improved.

As described above, according to the present invention, it is possible to provide a work size measuring device having excellent work size measurement accuracy.

1 is a perspective view showing a work size measuring device according to a first embodiment of the present invention. It is a perspective view which shows the measurement part of the range enclosed by the chain double-dashed line II in FIG. 2 is a graph showing changes in the distance between the first probe and the second probe with movement of the workpiece in the workpiece dimension measuring device in FIG. 1. It is a top view which shows the workpiece|work at the time of measurement of a workpiece dimension, and a 1st probe and a 2nd probe. It is a top view which shows a mode that the profile of the outer peripheral surface of a workpiece is measured using the workpiece dimension measuring apparatus in FIG. It is a top view which shows the workpiece|work at the time of measuring a workpiece dimension, and the 1st probe and the 2nd probe which have a plate-shaped contact part. It is a top view which shows the workpiece|work at the time of measuring a workpiece dimension, and the 1st probe and the 2nd probe which have a plate-shaped contact part. It is a top view which shows the workpiece|work at the time of measuring a workpiece dimension, and the 1st probe and the 2nd probe which have a plate-shaped contact part. It is a perspective view which shows the workpiece dimension measuring apparatus in Embodiment 2 of this invention. It is a perspective view which shows the measurement part of the range enclosed by the two-dot chain line X in FIG. FIG. 16 is a perspective view showing a work, a first probe and a second probe when measuring the workpiece dimensions in the workpiece dimension measuring apparatus according to the third embodiment of the present invention. 12 is a graph showing changes in the distance between the first probe and the second probe with the movement of the measuring unit in the workpiece dimension measuring device in FIG. 11. FIG. 16 is a perspective view showing a work and a measuring unit at the time of measuring the work size in the work size measuring device according to the fourth embodiment of the present invention. 14 is a graph showing changes in the distance between the first probe and the second probe with the movement of the measuring unit in the work dimension measuring device in FIG. 13. 9 is a flowchart showing a flow of measuring a work dimension according to the fifth embodiment of the present invention. 16 is a flowchart showing a modified example of the flow of measuring the work size shown in FIG. 15. 9 is a flowchart showing a flow of measuring a work dimension according to the sixth embodiment of the present invention.

Embodiments of the present invention will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are designated by the same reference numerals.

(Embodiment 1)
1 is a perspective view showing a work size measuring apparatus according to a first embodiment of the present invention. Referring to FIG. 1, a work size measuring device 10 is a device for measuring a size of a specific portion of a work, and in the present embodiment, is configured to be able to measure the outer diameter of a work 100 having a disk shape. ing.

The work size measuring device 10 may be provided alone or may be incorporated in a work processing line. In the case where the workpiece dimension measuring device 10 is provided in the latter in-line, a workpiece conveying device such as a loader is provided in order to automatically convey the workpiece from the machine tool that executes the machining of the workpiece to the workpiece dimension measuring device 10. Good. As a typical example, the work size measuring apparatus 10 executes an inspection process for determining the quality of the finished size of the work on the work processing line.

The workpiece dimension measuring device 10 includes a carriage 12, a control device 14, a display device 16, a plate material 31, a measuring portion 21, a measuring portion supporting portion 32, a stage 34, and a moving mechanism portion 35.

The dolly 12 is provided with various devices and equipment that make up the workpiece dimension measuring device 10. The installation base is not limited to the dolly 12, and a non-movable installation base may be used. The control device 14 controls the measurement operation in the workpiece dimension measuring device 10. The display device 16 is composed of, for example, a liquid crystal display panel, and displays the measurement result of the work dimension in the work dimension measuring device 10.

The plate material 31 has a flat plate shape. The plate material 31 is provided so as to extend in the horizontal direction. A measuring unit 21, a measuring unit supporting unit 32, a moving mechanism unit 35, and a stage 34 are provided on the plate material 31.

The measurement unit support unit 32 is configured to support the measurement unit 21 on the plate material 31. The measurement unit 21 is supported by the measurement unit support unit 32 so that a first measurement element 23 and a second measurement element 24, which will be described later, extend in the horizontal direction. The measurement unit 21 is fixed above the plate member 31 by the measurement unit support unit 32.

FIG. 2 is a perspective view showing a measurement unit in a range surrounded by a chain double-dashed line II in FIG. With reference to FIGS. 1 and 2, the measurement unit 21 includes a distance detection unit 22, a first probe 23, and a second probe 24.

The first probe 23 and the second probe 24 are brought into contact with the work 100 (more specifically, the outer peripheral surface 100c of the work 100) when measuring the work size. The first tracing stylus 23 and the second tracing stylus 24 are arranged to face each other in the direction indicated by the arrow 101 in FIG. The first probe 23 and the second probe 24 are arranged to face each other in the horizontal direction. The first measuring element 23 and the second measuring element 24 are arranged to face each other with the work 100 in between when measuring the work size.

The first measuring element 23 and the second measuring element 24 are urged in a direction in which the first measuring element 23 and the second measuring element 24 face each other by a spring force of a spring mechanism (not shown). At the time of measuring the work dimension, the work 100 resists the spring force of the work piece 100 so that the first measurement piece 23 and the second measurement piece 24 are separated from each other in the facing direction of the first measurement piece 23 and the second measurement piece 24. Spread out.

The first gauge head 23 and the second gauge head 24 receive an air pressure from a pneumatic device (not shown) and open in a direction away from each other in the facing direction of the first gauge head 23 and the second gauge head 24.

The structure of the first probe 23 and the second probe 24 will be described more specifically. The first probe 23 and the second probe 24 have an arm portion 25 and an abutting portion 26 in common. ..

The first tracing stylus 23 and the second tracing stylus 24 are connected to the distance detecting unit 22 via the arm 25. The arm part 25 extends from the distance detecting part 22 in an arm shape in a direction away from the distance detecting part 22.

The contact portion 26 is provided on the arm portion 25 at a position apart from the distance detecting portion 22. The contact portion 26 is a portion that contacts the work 100 when measuring the work size. The contact portion 26 is provided on the first probe 23 and the second probe 24 such that the first probe 23 and the second probe 24 face each other. The contact portion 26 is provided so as to project from the arm portion 25 in a spherical shape. The contact portion 26 has a convex surface (spherical surface) that projects toward the work 100 when measuring the work size. The contact portion 26 contacts the work 100 at the tip of the spherical surface.

The distance detection unit 22 measures the distance between the first and second measuring elements 23 and 24 (more specifically, the tip of the abutting portion 26 of the first measuring element 23 and the abutting portion of the second measuring element 24). It is configured so that the distance from the tip of 26) can be detected.

The mechanism for detecting the distance between the first measuring element 23 and the second measuring element 24 is not particularly limited, but for example, a linear (digital) gauge that detects and counts an optical pulse or a magnetic pulse by a digital counter is used. The detection accuracy of the distance between the first probe 23 and the second probe 24 is preferably on the order of 0.1 μm or less.

The stage 34 is provided as a base member on which the work 100 is placed. The stage 34 has a mounting surface 34a. The stage 34 is provided so that the mounting surface 34a extends in the horizontal direction. At the time of measuring the work size, the work 100 is placed on the placement surface 34a. The work 100 is mounted on the mounting surface 34a such that the outer peripheral surface 100c of the work 100 and the mounting surface 34a are orthogonal to each other.

The moving mechanism unit 35 contacts the work 100 in a direction orthogonal to the direction in which the first probe 23 and the second probe 24 face each other while bringing the first probe 23 and the second probe 24 into contact with the work 100. The measuring unit 21 is moved relatively.

In the present embodiment, while the measuring unit 21 is fixed, the work 100 placed on the stage 34 is provided by the moving mechanism unit 35 so as to be movable in the direction indicated by the arrow 102 in FIG. .. The movement direction of the workpiece 100 is a direction orthogonal to the direction in which the first probe 23 and the second probe 24 face each other and parallel to the mounting surface 34a.

The moving mechanism unit 35 includes a motor 36, a rotation/linear motion converting mechanism 37, and a moving plate 38. The motor 36 is composed of a servo motor capable of controlling the rotation angle (position) of the motor according to a command from the control device 14. The rotation/linear motion conversion mechanism 37 converts the rotational motion output from the motor 36 into a linear motion and transmits the linear motion to the moving plate 38. The rotation/linear motion converting mechanism 37 is formed of, for example, a ball screw. The moving plate 38 linearly moves in the direction indicated by the arrow 102 when the power from the motor 36 is transmitted via the rotation/linear motion converting mechanism 37. The stage 34 is mounted on the moving plate 38.

The work 100 placed on the stage 34 is arranged so as to face the measurement unit 21 in the direction indicated by the arrow 102. The dimension measurement part of the work 100 placed on the stage 34 (in the present embodiment, the outer peripheral surface 100c of the work 100), and the contact portions 26 of the first and second measuring elements 23 and 24 in the measuring section 21. Are provided so as to overlap each other in the height direction.

FIG. 3 is a graph showing changes in the distance between the first probe and the second probe with the movement of the workpiece in the workpiece dimension measuring device shown in FIG.

With reference to FIGS. 1 to 3, the work 100 is placed on the stage 34 when the work size is measured. The first probe 23 and the second probe 24 are opened. The movement mechanism unit 35 moves the work 100 placed on the stage 34 and positions it between the contact portions 26 of the first and second measuring elements 23 and 24. The opening operation of the first probe 23 and the second probe 24 is released, and the contact portions 26 of the first probe 23 and the second probe 24 are brought into contact with the outer peripheral surface 100c of the work 100.

While the work 100 mounted on the stage 34 is moved by the moving mechanism section 35, the distance detecting section 22 detects a change in the distance between the first and second measuring elements 23 and 24. The distance between the first probe 23 and the second probe 24 detected by the distance detector 22 changes as the work 100 moves, as shown in FIG.

The control device 14 specifies the maximum value or the minimum value of the distance between the first and second measuring elements 23 and 24 as the size of the specific portion of the work 100 from the detection result of the distance detecting section 22. In the present embodiment, the control device 14 specifies the maximum value Lmax of the distance between the first probe 24 and the second probe 24 as the outer diameter of the work 100.

FIG. 4 is a plan view showing the work, the first probe and the second probe when measuring the work dimensions.

With reference to FIG. 4, as a conventional problem, when measuring the outer diameter of the work 100, the center of the work 100 is set so that the contact portion 26 of the first gauge head 23 and the contact portion 26 of the second gauge head 24. It is necessary to accurately position it on the straight line connecting to and. However, it is troublesome to perform the work centering work for each work whose size is to be measured. Even when the work is automatically positioned on the stage by using a loader or the like, the work, the first probe 23, and the second probe 24 are caused by the thermal displacement and the posture change of the work. It is difficult to reproducibly obtain the relative positional relationship with.

On the other hand, in the workpiece dimension measuring device 10 according to the present embodiment, in the control device 14, the distance between the first and second measuring elements 23 and 24 that changes with the relative movement of the workpiece 100 and the measuring section 21. The maximum value Lmax of the distance is specified as the outer diameter of the work. Therefore, regardless of the accuracy of the positional relationship between the work 100 and the first and second measuring elements 23 and 24, excellent measurement accuracy of the work size can be obtained.

In the present embodiment, the configuration in which the workpiece 100 of the workpiece 100 and the measuring unit 21 is moved has been described, but the configuration in which the measuring unit 21 of the workpiece 100 and the measuring unit 21 is moved may be used. Both 100 and the measurement unit 21 may be moved.

When the work is moved, there is an advantage that interference of wiring and piping associated with the measurement unit 21 is unlikely to be a problem. When the measuring unit 21 is moved, the weight of the moving object is constant, so that there is an advantage that the measurement accuracy can be further improved.

Further, in the present embodiment, the contact portion 26 that projects in a spherical shape from the arm portion 25 is used in the first probe 23 and the second probe 24. The configuration is not limited to such a configuration, and for example, a contact portion that protrudes in a column shape from the arm portion 25 may be used. In this case, the contact portion has, as a convex surface, a cylindrical surface that projects toward the work 100 at the time of measuring the work dimension, and the tip of the cylindrical surface contacts the work 100.

When the work size measuring device 10 is provided in-line and the measured value of the outer diameter of the work 100 is out of the range of the machining tolerance, the information is fed back to the machine tool and the cutting condition of the work 100 is cut. You may perform the control which corrects.

FIG. 5 is a plan view showing how the profile of the outer peripheral surface of the work is measured using the work size measuring device in FIG.

Referring to FIG. 5, work 100 is held at a position where local maximum value Lmax of the distance between first probe 23 and second probe 24 is obtained. The work 100 is rotated about the center position P between the first and second measuring elements 23 and 24 while fixing either one of the first and second measuring elements 23 and 24. As a result, the profile of the outer peripheral surface 100c of the work 100 can be measured by either the first probe 23 or the second probe 24.

FIG. 6 to FIG. 8 are plan views showing the work at the time of measuring the work dimensions, and the first probe and the second probe having a plate-shaped contact portion.

With reference to FIGS. 6 to 8, the first probe 23 and the second probe 24 have a plate-shaped contact portion 26. The contact portion 26 has a facing surface 26a that faces each other in the direction in which the first probe 23 and the second probe 24 face each other. The facing surface 26a has a planar shape.

In this case, as shown in FIG. 7, the parallelism of the contact portion 26 between the first probe 23 and the second probe 24 affects the measurement accuracy of the work size, or as shown in FIG. In addition, foreign matter 131 such as chips sandwiched between the contact portion 26 and the work 100 may affect the measurement accuracy of the work size. Such a concern can be eliminated by using a spherical or cylindrical contact portion.

The structure of the workpiece dimension measuring apparatus 10 according to the first embodiment of the present invention described above will be collectively described. The workpiece dimension measuring apparatus 10 according to the present embodiment has the first probe 23 that is in contact with the workpiece 100. And a second measuring element 24 that is arranged so as to face the first measuring element 23 with the work 100 sandwiched therebetween, and contacts the work 100, and the first measuring element 23 and the second measuring element 24. And a moving mechanism section 35 for relatively moving the work 100 and the measuring section 21 in a direction orthogonal to the direction in which the first and second measuring elements 23 and 24 are opposed to each other. .. The measuring unit 21 further includes a distance detecting unit 22 that detects the distance between the first and second measuring elements 23 and 24 that changes with the relative movement of the work 100 and the measuring section 21. The workpiece dimension measuring apparatus 10 determines the maximum value of the distance between the first and second measuring elements 23 and 24 from the detection result of the distance detecting section 22 as the outer diameter of the workpiece 100, which is the dimension of the specific portion of the workpiece 100. The control device 14 for identifying the maximum value as the minimum value is further provided.

According to the work size measuring device 10 in the first embodiment of the present invention configured as described above, excellent work size measurement accuracy can be obtained.

(Embodiment 2)
FIG. 9 is a perspective view showing a work size measuring device according to the second embodiment of the present invention. The work size measuring apparatus according to the present embodiment has basically the same structure as the work size measuring apparatus 10 according to the first embodiment. Hereinafter, the description of the overlapping structure will not be repeated.

Referring to FIG. 9, work size measuring device 50 in the present embodiment is configured to be able to measure the inner diameter of work 200 having a cylindrical shape.

At the time of measuring the work size, the work 200 is placed on the placement surface 34a. The work 200 is mounted on the mounting surface 34a such that the inner peripheral surface 200d of the work 200 and the mounting surface 34a are orthogonal to each other.

The workpiece dimension measuring device 50 has a measuring part supporting part 51 instead of the measuring part supporting part 32 in the first embodiment. The measurement unit support unit 51 is configured to support the measurement unit 21 on the plate material 31. The measurement section 21 is supported by the measurement section support section 51 so that the first measurement element 23 and the second measurement element 24 extend in the vertical direction.

The work size measuring device 50 further includes a moving mechanism unit 55. The moving mechanism unit 55 moves the measuring unit 21 in a direction orthogonal to the mounting surface 34a of the stage 34, that is, in the vertical direction.

More specifically, the moving mechanism section 55 includes a motor 56, a rotation/linear motion converting mechanism 57, and a moving plate 58. The motor 56 is composed of a servo motor capable of controlling the rotation angle (position) of the motor according to a command from the control device 14. The rotation/linear motion conversion mechanism 57 converts the rotational motion output from the motor 56 into a linear motion and transmits the linear motion to the moving plate 58. The rotation/linear motion conversion mechanism 57 is formed of, for example, a ball screw. The moving plate 58 linearly moves in the direction indicated by the arrow 103 by the power transmitted from the motor 56 being transmitted via the rotation/linear motion converting mechanism 57. The measuring unit 21 is mounted on the moving plate 38.

FIG. 10 is a perspective view showing the measurement unit in the range surrounded by the chain double-dashed line X in FIG. With reference to FIGS. 9 and 10, the first probe 23 and the second probe 24 are opposed to each other in the opposing direction of the first probe 23 and the second probe 24 by the spring force of the spring mechanism (not shown). It is urged away. At the time of measuring the work dimension, the work 200 resists the spring force of the work piece 200 so that the first probe 23 and the second probe 24 approach each other in the facing direction of the first probe 23 and the second probe 24. Press down.

The first gauge head 23 and the second gauge head 24 receive an air pressure from a pneumatic device (not shown), and close in a direction in which the first gauge head 23 and the second gauge head 24 face each other in the facing direction.

The contact portion 26 is provided on the first and second measuring elements 23 and 24 so that the first and second measuring elements 23 and 24 are back-to-back with each other.

With reference to FIGS. 3, 9 and 10, the work 200 is placed on the stage 34 when measuring the work dimensions. The first probe 23 and the second probe 24 are closed. The movement mechanism section 35 moves the work 200 placed on the stage 34 and arranges the work 200 directly below the measurement section 21. The moving mechanism unit 55 lowers the measuring unit 21, and positions the contact portions 26 of the first and second measuring elements 23 and 24 inside the work 200. The closing operation of the first probe 23 and the second probe 24 is released, and the contact portions 26 of the first probe 23 and the second probe 24 are brought into contact with the inner peripheral surface 200d of the work 200.

While the moving mechanism unit 35 moves the workpiece 200 placed on the stage 34, the distance detecting unit 22 detects a change in the distance between the first and second measuring elements 23 and 24. The distance between the first probe 23 and the second probe 24 detected by the distance detector 22 changes as the work 200 moves, as shown in FIG.

The control device 14 specifies the maximum value Lmax of the distance between the first and second measuring elements 23 and 24 as the inner diameter of the work 200 from the detection result of the distance detecting section 22.

According to the work size measuring device 50 in the second embodiment of the present invention configured as described above, the effects described in the first embodiment can be similarly obtained.

(Embodiment 3)
FIG. 11 is a perspective view showing a work, a first measuring element, and a second measuring element when measuring the work dimension in the work dimension measuring apparatus according to the third embodiment of the present invention. FIG. 12 is a graph showing changes in the distance between the first probe and the second probe with the movement of the measuring unit in the work dimension measuring apparatus in FIG. 11.

The work size measuring apparatus according to the present embodiment has basically the same structure as the work size measuring apparatus 10 according to the first embodiment. Hereinafter, the description of the overlapping structure will not be repeated.

With reference to FIGS. 11 and 12, the workpiece dimension measuring apparatus according to the present embodiment is configured to be able to measure the minimum diameter of constricted portion 301 in workpiece 300 having constricted portion 301.

At the time of measuring the work size, the work 300 is placed on the placement surface 34a. The work 300 is mounted on the mounting surface 34a such that the diameter of the constricted portion 301 continuously changes in the direction orthogonal to the mounting surface 34a.

At the time of measuring the work size, the work 300 mounted on the stage 34 is fixed, while the measuring unit 21 is movably provided in a direction indicated by an arrow 104 in FIG. 11 by a moving mechanism unit (not shown). Has been. The moving direction of the measuring unit 21 is a direction orthogonal to the direction in which the first and second measuring elements 23 and 24 face each other and orthogonal to the mounting surface 34a.

At the time of measuring the workpiece size, the contact portion 26 of the first probe 23 and the second probe 24 is brought into contact with the constricted portion 301 of the workpiece 300, and the moving mechanism portion (not shown) moves the measuring portion 21 to the arrow 104. Move in the direction shown in. At this time, the distance detector 22 detects a change in the distance between the first probe 23 and the second probe 24. The distance between the first and second measuring elements 23 and 24 detected by the distance detecting section 22 changes as shown in FIG.

The control device 14 specifies the minimum value Lmin of the distance between the first probe 23 and the second probe 24 from the detection result of the distance detector 22 as the minimum diameter of the constricted portion 301.

According to the work size measuring device in the third embodiment of the present invention configured as described above, the effects described in the first embodiment can be similarly obtained.

(Embodiment 4)
FIG. 13 is a perspective view showing a work and a measuring unit at the time of measuring the work size in the work size measuring apparatus according to the fourth embodiment of the present invention. FIG. 14 is a graph showing changes in the distance between the first probe and the second probe with the movement of the measuring unit in the work dimension measuring device in FIG. 13.

The work size measuring apparatus according to the present embodiment has basically the same structure as the work size measuring apparatus 10 according to the first embodiment. Hereinafter, the description of the overlapping structure will not be repeated.

Referring to FIGS. 13 and 14, the work size measuring apparatus according to the present embodiment is configured to be able to measure the minimum width of key groove 401 in work 400 having key groove 401 extending in one direction.

At the time of measuring the work size, the work 400 is placed on the placement surface 34a. The work 400 is mounted on the mounting surface 34a so that the key groove 401 extends in a direction parallel to the mounting surface 34a.

At the time of measuring the work size, the work 400 placed on the stage 34 is fixed, while the measuring unit 21 is movably provided in a direction indicated by an arrow 105 in FIG. 13 by a moving mechanism unit (not shown). Has been. The moving direction of the measuring unit 21 is a direction that is orthogonal to the direction in which the first measuring element 23 and the second measuring element 24 face each other and that is parallel to the mounting surface 34a.

At the time of measuring the work size, the contact portion 26 of the first probe 23 and the second probe 24 is brought into contact with the inner surface of the key groove 401, and the moving mechanism portion (not shown) moves the measurement portion 21 to the arrow 105. Move in the direction shown in. At this time, the distance detector 22 detects a change in the distance between the first probe 23 and the second probe 24. The distance between the first tracing stylus 23 and the second tracing stylus 24 detected by the distance detecting unit 22 changes as the measuring unit 21 moves, as shown in FIG.

The control device 14 first identifies the minimum value Lmin1 and the minimum value Lmin2 of the distance between the first probe 23 and the second probe 24 from the detection result of the distance detector 22 as the minimum width of the key groove 401. Further, Lmin2 having the smaller value among the minimum value Lmin1 and the minimum value Lmin2 is specified.

Note that the present invention can be applied to the measurement of the maximum width of the key groove and the minimum width or the maximum width of the key in the same manner as the measurement of the minimum width of the key groove 401.

According to the work size measuring device in the fourth embodiment of the present invention configured in this way, the effects described in the first embodiment can be similarly obtained.

(Embodiment 5)
In the present embodiment, a flow of measuring a work dimension applicable to the work dimension measuring apparatus according to the first to fourth embodiments will be described.

FIG. 15 is a flow chart showing the flow of measuring the work size in the fifth embodiment of the present invention. In the flowchart shown in FIG. 15, it is assumed that the work size measuring apparatus 10 according to the first embodiment is used to measure the outer diameter of the work 100.

With reference to FIG. 15, first, according to the procedure described in the first embodiment, the work 100 placed on the stage 34 is moved so as to move between the contact portions 26 of the first probe 23 and the second probe 24. Position. By releasing the opening operation of the first probe 23 and the second probe 24, the first probe 23 and the second probe 24 are brought into contact with the outer peripheral surface 100c of the work 100 (S101).

Next, the control device 14 causes the first gauge head 23 and the second gauge head 24 at the time when the first gauge head 23 and the second gauge head 24 contact the outer peripheral surface 100c of the work 100 in step S101. The initial value of the distance between them is specified (S102).

Next, while moving the work 100 placed on the stage 34, a change in the distance between the first probe 23 and the second probe 24 is detected (S103). At this time, the control device 14 determines whether or not the distance between the first probe 23 and the second probe 24 increases from the initial value specified in step S102 (S104).

When it is determined in step S104 that the distance between the first and second measuring elements 23 and 24 increases from the initial value, the work 100 moves and the distance between the first and second measuring elements 23 and 24 is increased. The measurement of the work size is continued by continuing the detection of the change in the distance (S105). Next, the control device 14 specifies the maximum value Lmax of the distance between the first probe 23 and the second probe 24 as the outer diameter of the work 100 (S106).

On the other hand, when it is determined in step S104 that the distance between the first probe 23 and the second probe 24 decreases from the initial value, the measurement of the work size is stopped (S107). Next, the first measuring element 23 and the second measuring element 24 are opened to retract the work 100 from the measuring section 21 (S108). Then, the process returns to step S101.

When the distance between the first probe 23 and the second probe 24 decreases from the initial value, the maximum value of the distance between the first probe 23 and the second probe 24 is maintained even if the measurement of the workpiece dimension is continued. Lmax cannot be obtained. Therefore, the measurement of the work size can be improved by stopping the measurement of the work size early and executing the step S101 again.

In the step of S101 to be re-executed, at the position on the front side of the moving work, as compared with the position where the first and second measuring elements 23 and 24 contact the work 100 in the previous step of S101, The first gauge head 23 and the second gauge head 24 may be brought into contact with the work 100.

FIG. 16 is a flowchart showing a modified example of the flow of measuring the work size shown in FIG. In the flow chart shown in FIG. 16, it is assumed that the work size measuring apparatus according to the third embodiment is used to measure the minimum diameter of the constricted portion 301 of the work 300.

Referring to FIG. 16, the work dimension measurement flow in the present modification is different from the work dimension measurement flow shown in FIG. 15 mainly in the step S104. In this modified example, in step S104, the control device 14 causes the distance between the first probe 23 and the second probe 24 to be the first probe 23 and the second probe 24 specified in step S102. It is determined whether or not the distance is reduced from the initial value.

When it is determined in step S104 that the distance between the first and second measuring elements 23 and 24 decreases from the initial value, the measurement of the work dimension is continued (S105). On the other hand, when it is determined that the distance between the first probe 23 and the second probe 24 is increased from the initial value in step S104, the measurement of the work dimension is stopped (S107).

According to the work size measuring device in the fifth embodiment of the present invention configured as described above, the effects described in the first embodiment can be similarly obtained.

(Embodiment 6)
In the present embodiment, another example of the work dimension measurement flow applicable to the work dimension measuring devices according to the first to fourth embodiments will be described.

FIG. 17 is a flow chart showing the flow of measuring the work size in the sixth embodiment of the present invention. In the flowchart shown in FIG. 17, it is assumed that the work size measuring apparatus 10 according to the first embodiment is used to measure the outer diameter of the work 100.

With reference to FIG. 17, first, the master work diameter of the work 100 is input to the control device 14 (S111). The master workpiece diameter is a reference dimension value of the outer diameter of the workpiece 100 to be measured, and is set within the range of machining tolerance of the workpiece 100. As an example, the master work diameter is set to the median of the machining tolerances of the work 100.

Next, according to the procedure described in the first embodiment, the work 100 placed on the stage 34 is moved and positioned between the abutting portions 26 of the first probe 23 and the second probe 24. By releasing the opening operation of the first gauge head 23 and the second gauge head 24, the first gauge head 23 and the second gauge head 24 are brought into contact with the outer peripheral surface 100c of the work 100 (S112).

Next, when the control device 14 abuts the outer peripheral surface 100c of the work 100 with the first probe 23 and the second probe 24 in step S112, the first probe 23 and the second probe 24. The initial value of the distance is specified (S113).

Next, the control device 14 sets the master work diameter of the work 100 input in step S111 and the initial value of the distance between the first and second measuring elements 23 and 24 specified in step S113. It is determined whether or not the difference is less than or equal to a preset predetermined value (S114).

When it is determined in step S114 that the difference between the master work diameter and the initial value is equal to or smaller than the predetermined value, the first probe 23 and the second measurement probe 23 and the second measurement device are moved while moving the work 100 placed on the stage 34. By measuring the change in the distance between the children 24, the measurement of the work size is continued (S115). Next, the control device 14 specifies the maximum value Lmax of the distance between the first and second measuring elements 23 and 24 as the outer diameter of the work 100 (S116).

On the other hand, if it is determined in step S114 that the difference between the master work diameter and the initial value exceeds the predetermined value, the measurement of the work dimension is stopped (S117). Next, the first probe 23 and the second probe 24 are opened to retract the work 100 from the measuring section 21 (S118). Then, the process returns to step S112.

When it is determined that the difference between the master work diameter and the initial value exceeds the predetermined value, the position where the first probe 23 and the second probe 24 contact the workpiece 100 in the step of S112 is the maximum of the workpiece 100. It can be considered that it is greatly separated from the diameter portion. Therefore, the measurement of the work size can be improved by stopping the measurement of the work size early and executing the step S112 again.

According to the work size measuring device in the sixth embodiment of the present invention configured as described above, the effects described in the first embodiment can be similarly obtained.

The embodiments disclosed this time are to be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope.

The present invention is applied to a work size measuring device for measuring the size of a specific part of a work.

10, 50 Workpiece size measuring device, 12 trolley, 14 Control device, 16 Display device, 21 Measuring part, 22 Distance detecting part, 23 First measuring element, 24 Second measuring element, 25 Arm part, 26 Abutting part, 26a Opposing surface, 31 plate material, 32,51 measuring part supporting part, 34 stage, 34a mounting surface, 35,55 moving mechanism part, 36,56 motor, 37,57 linear motion converting mechanism, 38,58 moving plate, 100 , 200, 300, 400 workpiece, 100c outer peripheral surface, 131 foreign matter, 200d inner peripheral surface, 301 constricted portion, 401 keyway.

Claims (5)

A first measuring element that contacts the workpiece, is arranged before Symbol opposite the first measuring element, a measuring unit and a second measuring element that contacts the workpiece,
While contacting the work piece with the first gauge head and the second gauge head, the work piece and the measuring section are relatively moved in a direction orthogonal to a direction in which the first gauge head and the second gauge head face each other. And a moving mechanism section for moving,
The measurement unit further includes a distance detection unit that detects a distance between the first probe and the second probe that changes with relative movement between a workpiece and the measurement unit, and
As a dimension of the specific portion of the work, a control device that specifies a maximum value or a minimum value of the distance between the first probe and the second probe from the detection result of the distance detector ,
The control device is
Specifying an initial value of the distance between the first and second measuring elements when the first and second measuring elements are brought into contact with a workpiece,
When the distance between the first probe and the second probe increases from the initial value due to the relative movement between the work and the measurement unit, the measurement is continued, and the work and the measurement unit are separated from each other. When the distance between the first probe and the second probe decreases from the initial value due to the relative movement, the measurement is stopped,
A work size measuring device that specifies the maximum value of the distance between the first and second measuring elements from the detection result of the distance detecting section as the size of the specific portion of the work. A measuring part having a first measuring element which is in contact with the work and a second measuring element which is arranged so as to face the first measuring element and which is in contact with the work;
While contacting the work piece with the first gauge head and the second gauge head, the work piece and the measuring section are relatively moved in a direction orthogonal to a direction in which the first gauge head and the second gauge head face each other. And a moving mechanism section for moving,
The measurement unit further includes a distance detection unit that detects a distance between the first probe and the second probe that changes with relative movement between a workpiece and the measurement unit, and
As a dimension of the specific portion of the work, a control device that specifies a maximum value or a minimum value of the distance between the first probe and the second probe from the detection result of the distance detector is provided.
The control device is
Specifying an initial value of a distance between the first and second measuring elements when the first and second measuring elements are brought into contact with a work,
When the distance between the first probe and the second probe decreases from the initial value due to the relative movement between the work and the measurement unit, the measurement is continued and the work and the measurement unit are separated from each other. When the distance between the first probe and the second probe increases from the initial value due to the relative movement, the measurement is stopped,
A work size measuring device that specifies the minimum value of the distance between the first and second measuring elements from the detection result of the distance detecting section as the dimension of the specific part of the workpiece. Further comprising a base member having a mounting surface on which the work is mounted,
The moving mechanism section moves the workpiece and the measuring section relative to each other in a direction orthogonal to a direction in which the first and second measuring elements face each other, and in a direction parallel to the mounting surface. The work size measuring device according to claim 1 or 2 . The first probe and the second probe have a convex surface projecting toward a work, and include a contact portion that abuts against the work at its tip, according to any one of claims 1 to 3 . Work size measuring device. In the control device, a reference dimension value of a specific part of the work is input,
The control device is
Specifying an initial value of the distance between the first and second measuring elements when the first and second measuring elements are brought into contact with a workpiece,
When the difference between the initial value and the reference dimension value is less than or equal to a preset predetermined value, measurement is continued, and the difference between the initial value and the reference dimension value is a preset predetermined value. The work size measuring device according to any one of claims 1 to 4 , wherein the measurement is stopped when the value exceeds.

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