JP2018128411A - Work dimension measurement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work dimension measurement device that is excellent in measurement accuracy of a work dimension.SOLUTION: A work dimension measurement device 10 comprises: a measurement unit 21 that has a first gauge head 23 to be abutted on a work 100, and a second gauge head 24 arranged opposing the first gauge head 23 across the work 100, and to be abutted on the work 100; and a movement mechanism unit 35 that makes the first gauge head 23 and the second gauge head 24 abut on the work 100, and causes the work 100 and the measurement unit 21 to relatively move in a direction orthogonal to a direction where the first gauge head 23 and the second gauge head 24 oppose each other. The measurement unit 21 further has a distance detection unit 22 that detects a distance, which varies accompanied by a relative movement to the work 100 and the measurement unit 21, between the first gauge head 23 and the second gauge head 24. The work dimension measurement device 10 further comprises a control device 14 that identifies a maximum value of the distance between the first gauge head 23 and the second gauge head 24 as an outer diameter of the work 100.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a workpiece dimension measuring apparatus.

  With respect to a conventional workpiece dimension measuring apparatus, for example, Japanese Patent Application Laid-Open No. 59-27203 aims to enable high-precision and high-reliability measurement by simple adjustment in response to a change in workpiece dimension. 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 reference to the V groove forming the angle 2α. A pair of measuring elements is provided in a direction perpendicular to the center line of the V groove. By moving the reference position of the tip of the probe along a line in the direction of angle θ having a relationship of sin α = tan θ, the probe can be easily set corresponding to the change in the diameter of the workpiece.

JP 59-27203 A

  As disclosed in Patent Document 1 described above, an apparatus that measures the outer diameter of a workpiece by placing the workpiece between a pair of opposed measuring elements is known. In such a measuring apparatus, 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 workpiece center. That is, the positioning accuracy between the workpiece and the pair of measuring elements greatly affects the measurement accuracy of the workpiece dimension.

  On the other hand, there are cases where the dimensions of a plurality of workpieces are continuously measured, for example, when a measuring device is incorporated in a machining line and workpiece dimensions after machining are automatically measured. In such a case, since it is difficult to position the workpiece with respect to the measuring device with high reproducibility, the measurement accuracy of the workpiece dimensions may be reduced.

  Accordingly, an object of the present invention is to solve the above-described problem and to provide a workpiece dimension measuring apparatus having excellent workpiece dimension measurement accuracy.

  A workpiece dimension measuring apparatus according to the present invention includes a first measuring element that is in contact with a workpiece, and a second measuring element that is disposed to face the first measuring element across the workpiece and that is in contact with the workpiece. The workpiece and the measurement unit are relatively placed in a direction perpendicular to the direction in which the first measurement unit and the second measurement unit face each other while the measurement unit having the first measurement unit and the second measurement unit are brought into contact with the workpiece. And a moving mechanism unit for moving. The measurement unit further includes a distance detection unit that detects a distance between the first measurement unit and the second measurement unit that changes with relative movement between the workpiece and the measurement unit. The workpiece dimension measuring apparatus further includes a control device that specifies the maximum value or the minimum value of the distance between the first measuring element and the second measuring element from the detection result of the distance detecting unit as the dimension of the specific part of the workpiece.

  According to the workpiece dimension measuring apparatus configured as described above, the maximum value or the minimum value of the distance between the first measuring element and the second measuring element, which changes with the relative movement between the workpiece and the measuring unit, is specified. Since it is specified as the dimension of the part, excellent measurement accuracy of the workpiece dimension can be obtained regardless of the accuracy of the positional relationship between the workpiece and the first measuring element and the second measuring element.

  Preferably, the workpiece dimension measuring device further includes a base member having a placement surface on which the workpiece is placed. The moving mechanism unit relatively moves the workpiece and the measuring unit in a direction perpendicular to the direction in which the first measuring element and the second measuring element face each other and parallel to the placement surface.

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

  Preferably, the first measuring element and the second measuring element have a convex surface protruding toward the workpiece, and include a contact portion that contacts the workpiece at the tip.

  According to the workpiece dimension measuring apparatus configured as described above, the positional relationship between the first measuring element and the second measuring element and the foreign matter interposed between the measuring element and the workpiece affect the measurement accuracy of the workpiece dimension. Can be suppressed.

  Preferably, the control device specifies an initial value of a distance between the first measuring element and the second measuring element when the first measuring element and the second measuring element are brought into contact with the workpiece. When the distance between the first measuring element and the second measuring element increases from the initial value due to the relative movement between the workpiece and the measuring unit, the control device continues the measurement, and the relative distance between the workpiece and the measuring unit. When the distance between the first probe and the second probe decreases from the initial value along with the movement, the measurement is stopped. The control device specifies the maximum value of the distance between the first measuring element and the second measuring element from the detection result in the distance detection unit as the dimension of the specific part of the workpiece.

  Preferably, the control device specifies an initial value of a distance between the first measuring element and the second measuring element when the first measuring element and the second measuring element are brought into contact with the workpiece. When the distance between the first measuring element and the second measuring element decreases from the initial value due to the relative movement between the workpiece and the measuring unit, the control device continues the measurement, and the relative between the workpiece and the measuring unit. When the distance between the first probe and the second probe increases from the initial value along with the movement, the measurement is stopped. The control device specifies the minimum value of the distance between the first measuring element and the second measuring element from the detection result of the distance detecting unit as the dimension of the specific part of the workpiece.

  According to the workpiece dimension measuring apparatus configured as described above, the maximum value of the distance between the first measuring element and the second measuring element that is specified as the dimension of the specific part of the workpiece even though the measurement of the workpiece dimension is continued. Alternatively, it can be avoided that there is no minimum value. Thereby, the measurement efficiency of a workpiece dimension can be improved.

  Preferably, a reference dimension value of a specific part of the workpiece is input to the control device. The control device specifies an initial value of a distance between the first measuring element and the second measuring element when the first measuring element and the second measuring element are brought into contact with the workpiece. The control device continues the measurement when the difference between the initial value and the reference dimension value is equal to or less than a predetermined value set in advance, and the difference between the initial value and the reference dimension value is set to a predetermined value set in advance. If it exceeds, stop the measurement.

  According to the workpiece dimension measuring apparatus configured as described above, the maximum value or the minimum value of the distance between the first measuring element and the second measuring element specified as the dimension of the specific part of the workpiece can be obtained at an early stage. Thereby, the measurement efficiency of a workpiece dimension can be improved.

  As described above, according to the present invention, it is possible to provide a workpiece dimension measuring apparatus having excellent workpiece dimension measurement accuracy.

It is a perspective view which shows the workpiece dimension measuring apparatus in Embodiment 1 of this invention. It is a perspective view which shows the measurement part of the range enclosed with the dashed-two dotted line II in FIG. In the workpiece dimension measuring apparatus in FIG. 1, it is a graph which shows the change of the distance between the 1st measuring element and the 2nd measuring element accompanying a workpiece | work movement. It is a top view which shows the workpiece | work at the time of a workpiece | work dimension measurement, and a 1st measuring element and a 2nd measuring element. It is a top view which shows a mode that the profile of the outer peripheral surface of a workpiece | work is measured using the workpiece | work dimension measuring apparatus in FIG. It is a top view which shows the workpiece | work at the time of a workpiece | work dimension measurement, and the 1st measuring element and 2nd measuring element which have a plate-shaped contact part. It is a top view which shows the workpiece | work at the time of a workpiece | work dimension measurement, and the 1st measuring element and 2nd measuring element which have a plate-shaped contact part. It is a top view which shows the workpiece | work at the time of a workpiece | work dimension measurement, and the 1st measuring element and 2nd measuring element 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 with the dashed-two dotted line X in FIG. In the workpiece dimension measuring apparatus in Embodiment 3 of this invention, it is a perspective view which shows the workpiece | work at the time of a workpiece | work dimension measurement, and a 1st measuring element and a 2nd measuring element. 12 is a graph showing a change in the distance between the first measuring element and the second measuring element accompanying the movement of the measuring unit in the workpiece dimension measuring apparatus in FIG. In the workpiece dimension measuring apparatus in Embodiment 4 of this invention, it is a perspective view which shows the workpiece | work at the time of a workpiece | work dimension measurement, and a measurement part. 14 is a graph showing a change in the distance between the first measuring element and the second measuring element accompanying the movement of the measuring unit in the workpiece dimension measuring apparatus in FIG. 13. It is a flowchart which shows the measurement flow of the workpiece | work dimension in Embodiment 5 of this invention. It is a flowchart which shows the modification of the measurement flow of the workpiece | work dimension shown in FIG. It is a flowchart which shows the measurement flow of the workpiece | work dimension in Embodiment 6 of this 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 denoted by the same reference numerals.

(Embodiment 1)
1 is a perspective view showing a workpiece dimension measuring apparatus according to Embodiment 1 of the present invention. Referring to FIG. 1, a workpiece dimension measuring apparatus 10 is an apparatus for measuring a dimension of a specific part of a workpiece. In the present embodiment, the workpiece dimension measuring apparatus 10 is configured to be able to measure the outer diameter of a workpiece 100 having a disk shape. ing.

  The workpiece dimension measuring apparatus 10 may be provided as a single unit or may be incorporated into a workpiece processing line. When the workpiece dimension measuring device 10 is provided in the latter inline, a workpiece transfer device such as a loader is provided to enable automatic transfer of the workpiece from the machine tool for processing the workpiece to the workpiece dimension measuring device 10. Also good. As a typical example, the workpiece dimension measuring apparatus 10 executes an inspection process for determining whether the workpiece finish dimension is good or bad in the workpiece 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 unit 21, a measuring unit support unit 32, a stage 34, and a moving mechanism unit 35.

  Various devices and devices constituting the workpiece dimension measuring device 10 are installed on the carriage 12. Not limited to the carriage 12, a non-movable installation stand 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 a workpiece dimension measurement result in the workpiece dimension measuring apparatus 10.

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

  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 a measurement unit support unit 32 such that a first measurement unit 23 and a second measurement unit 24 described later extend in the horizontal direction. The measurement unit 21 is fixed above the plate material 31 by a measurement unit support unit 32.

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

  The first measuring element 23 and the second measuring element 24 are brought into contact with the workpiece 100 (more specifically, the outer peripheral surface 100c of the workpiece 100) when measuring the workpiece dimensions. The first measuring element 23 and the second measuring element 24 are arranged to face each other in the direction indicated by the arrow 101 in FIG. The first measuring element 23 and the second measuring element 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 workpiece 100 interposed therebetween when measuring the workpiece dimension.

  The first measuring element 23 and the second measuring element 24 are urged in a direction approaching each other in the opposing direction of the first measuring element 23 and the second measuring element 24 by a spring force by a spring mechanism (not shown). When measuring the workpiece dimensions, the workpiece 100 moves the first measuring element 23 and the second measuring element 24 away from each other in the opposing direction of the first measuring element 23 and the second measuring element 24 while resisting the spring force. Push out.

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

  The structure of the first measuring element 23 and the second measuring element 24 will be described more specifically. The first measuring element 23 and the second measuring element 24 have an arm portion 25 and a contact portion 26 in common. .

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

  The contact part 26 is provided on the arm part 25 at a position away from the distance detection part 22. The contact portion 26 is a portion that contacts the workpiece 100 when measuring the workpiece dimensions. The contact portion 26 is provided on the first measuring element 23 and the second measuring element 24 so as to face each other between the first measuring element 23 and the second measuring element 24. The abutting portion 26 is provided so as to protrude spherically from the arm portion 25. The contact portion 26 has a convex surface (spherical surface) that protrudes toward the workpiece 100 when measuring the workpiece dimensions. The abutting portion 26 abuts on the workpiece 100 at the tip of the spherical surface.

  The distance detector 22 is a distance between the first measuring element 23 and the second measuring element 24 (more specifically, the tip of the abutting part 26 in the first measuring element 23 and the abutting part in the second measuring element 24). The distance between the front end of the head 26 and the front end 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. For example, a linear (digital) gauge that detects and counts a light pulse or a magnetic pulse with a digital counter is used. The detection accuracy of the distance between the first measuring element 23 and the second measuring element 24 is preferably not more than the order of 0.1 μm.

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

  The moving mechanism unit 35 causes the first measuring element 23 and the second measuring element 24 to contact the workpiece 100 while the workpiece 100 and the workpiece 100 are arranged in a direction orthogonal to the direction in which the first measuring element 23 and the second measuring element 24 face each other. The measurement unit 21 is moved relatively.

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

  The moving mechanism unit 35 includes a motor 36, a rotation / linear motion conversion 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 rotary motion output from the motor 36 into a linear motion and transmits the linear motion to the moving plate 38. The rotation / linear motion conversion mechanism 37 is composed of, for example, a ball screw. The moving plate 38 linearly moves in the direction indicated by the arrow 102 when power from the motor 36 is transmitted via the rotation / linear motion converting mechanism 37. A stage 34 is mounted on the moving plate 38.

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

  FIG. 3 is a graph showing a change in the distance between the first probe and the second probe as the workpiece moves in the workpiece dimension measuring apparatus shown in FIG.

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

  The distance detector 22 detects a change in the distance between the first probe 23 and the second probe 24 while moving the workpiece 100 placed on the stage 34 by the moving mechanism 35. The distance between the first measuring element 23 and the second measuring element 24 detected by the distance detecting unit 22 changes as shown in FIG.

  The control device 14 specifies the maximum value or the minimum value of the distance between the first measuring element 23 and the second measuring element 24 from the detection result in the distance detection unit 22 as the dimension of the specific part of the workpiece 100. In the present embodiment, 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 workpiece 100.

  FIG. 4 is a plan view showing the workpiece, the first measuring element, and the second measuring element when measuring the workpiece dimension.

  Referring to FIG. 4, as a conventional problem, when measuring the outer diameter of the workpiece 100, the center of the workpiece 100 is centered on the contact portion 26 in the first probe 23 and the contact portion 26 in the second probe 24. Must be positioned accurately on a straight line connecting However, it takes time to perform the work centering operation for each work whose dimensions are to be measured. Further, even when the workpiece is automatically positioned on the stage using a loader or the like, the workpiece, the first measuring element 23 and the second measuring element 24 are caused by thermal displacement or a change in the posture of the workpiece. It is difficult to obtain a relative positional relationship with the reproducibility.

  On the other hand, in the workpiece dimension measuring apparatus 10 according to the present embodiment, in the control apparatus 14, the first measuring element 23 and the second measuring element 24 that change with the relative movement between the workpiece 100 and the measuring unit 21 are used. The maximum value Lmax of the distance is specified as the outer diameter of the workpiece. For this reason, regardless of the accuracy of the positional relationship between the workpiece 100 and the first measuring element 23 and the second measuring element 24, it is possible to obtain excellent measurement accuracy of the workpiece dimensions.

  In addition, although the structure which moves the workpiece | work 100 of the workpiece | work 100 and the measurement part 21 was demonstrated in this Embodiment, it is good also as a structure which moves the measurement part 21 of the workpiece | work 100 and the measurement part 21. It is good also as a structure which moves both 100 and the measurement part 21. FIG.

  When moving the workpiece, there is an advantage that interference of wiring and piping accompanying the measurement unit 21 is less likely to be a problem. When the measuring unit 21 is moved, since the weight of the moving object is constant, there is an advantage that further improvement in measurement accuracy can be expected.

  In the present embodiment, the first measuring element 23 and the second measuring element 24 use a contact portion 26 that protrudes spherically from the arm portion 25. It is not restricted to such a structure, For example, the contact part which protrudes from the arm part 25 in a column shape may be used. In this case, the contact portion has a cylindrical surface that protrudes toward the workpiece 100 when measuring the workpiece size as a convex surface, and contacts the workpiece 100 at the tip of the cylindrical surface.

  When the workpiece dimension measuring apparatus 10 is provided in-line, and the measured value of the outer diameter of the workpiece 100 is out of the range of machining tolerance, the information is fed back to the machine tool to cut the workpiece 100. You may perform control which correct | amends.

  FIG. 5 is a plan view showing a state in which the profile of the outer peripheral surface of the workpiece is measured using the workpiece dimension measuring apparatus in FIG.

  Referring to FIG. 5, workpiece 100 is held at a position where the maximum value Lmax of the distance between first measuring element 23 and second measuring element 24 is obtained. While either one of the first measuring element 23 and the second measuring element 24 is fixed, the workpiece 100 is rotated around the center position P between the first measuring element 23 and the second measuring element 24. Thereby, the profile of the outer peripheral surface 100c of the workpiece | work 100 can be measured in either one of the 1st measuring element 23 and the 2nd measuring element 24. FIG.

  6 to 8 are plan views showing the workpiece at the time of measuring the workpiece dimensions, and the first and second measuring elements having plate-shaped contact portions.

  Referring to FIGS. 6 to 8, the first measuring element 23 and the second measuring element 24 have a plate-shaped contact portion 26. The contact portion 26 has a facing surface 26a that faces in the direction in which the first measuring element 23 and the second measuring element 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 measuring element 23 and the second measuring element 24 affects the measurement accuracy of the workpiece dimension, or as shown in FIG. In addition, there is a possibility that foreign matter 131 such as chips sandwiched between the contact portion 26 and the workpiece 100 may affect the measurement accuracy of the workpiece dimensions. 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 described together. The workpiece dimension measuring apparatus 10 according to the present embodiment is a first measuring element 23 that comes into contact with the workpiece 100. A measuring unit 21 having a second measuring element 24 that is disposed opposite to the first measuring element 23 with the workpiece 100 interposed therebetween, and is in contact with the workpiece 100, and the first measuring element 23 and the second measuring element 24. And a moving mechanism unit 35 that relatively moves the workpiece 100 and the measuring unit 21 in a direction orthogonal to the direction in which the first measuring element 23 and the second measuring element 24 face each other. . The measurement unit 21 further includes a distance detection unit 22 that detects a distance between the first measurement unit 23 and the second measurement unit 24 that change with relative movement between the workpiece 100 and the measurement unit 21. The workpiece dimension measuring apparatus 10 determines the maximum value of the distance between the first measuring element 23 and the second measuring element 24 from the detection result in the distance detecting unit 22 as the outer diameter of the workpiece 100 which is a dimension of a specific part of the workpiece 100 or A control device 14 for specifying a local maximum value as the local minimum value is further provided.

  According to the workpiece dimension measuring apparatus 10 according to the first embodiment of the present invention configured as described above, it is possible to obtain excellent workpiece dimension measurement accuracy.

(Embodiment 2)
FIG. 9 is a perspective view showing a workpiece dimension measuring apparatus according to Embodiment 2 of the present invention. Compared with the workpiece dimension measuring apparatus 10 in the first embodiment, the workpiece dimension measuring apparatus in the present embodiment basically has the same structure. Hereinafter, the description of the overlapping structure will not be repeated.

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

  When measuring the workpiece dimensions, the workpiece 200 is placed on the placement surface 34a. The workpiece 200 is placed on the placement surface 34a so that the inner peripheral surface 200d of the workpiece 200 and the placement surface 34a are orthogonal to each other.

  The workpiece dimension measuring apparatus 50 includes a measurement unit support 51 in place of the measurement unit support 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 unit 21 is supported by the measurement unit support unit 51 so that the first measurement unit 23 and the second measurement unit 24 extend in the vertical direction.

  The workpiece dimension measuring device 50 further includes a moving mechanism unit 55. The movement mechanism unit 55 moves the measurement unit 21 in a direction orthogonal to the placement surface 34 a of the stage 34, that is, in the vertical direction.

  More specifically, the moving mechanism unit 55 includes a motor 56, a rotation / linear motion conversion 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 rotary 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 constituted by, for example, a ball screw. The moving plate 58 linearly moves in the direction indicated by the arrow 103 when power from the motor 56 is transmitted through 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 a measurement unit in a range surrounded by a two-dot chain line X in FIG. Referring to FIGS. 9 and 10, the first measuring element 23 and the second measuring element 24 are mutually connected in the opposing direction of the first measuring element 23 and the second measuring element 24 by a spring force by a spring mechanism (not shown). It is biased away. When measuring the workpiece dimensions, the workpiece 200 resists the spring force while moving the first measuring element 23 and the second measuring element 24 toward each other in the opposing direction of the first measuring element 23 and the second measuring element 24. Shrink.

  The first measuring element 23 and the second measuring element 24 receive air pressure from a pneumatic device (not shown), and close in a direction in which the first measuring element 23 and the second measuring element 24 approach each other in the facing direction of the first measuring element 23 and the second measuring element 24.

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

  Referring to FIGS. 3, 9, and 10, workpiece 200 is placed on stage 34 when measuring the workpiece dimensions. The first measuring element 23 and the second measuring element 24 are closed. The moving mechanism unit 35 moves the workpiece 200 placed on the stage 34 and places it directly under the measuring unit 21. The measuring unit 21 is lowered by the moving mechanism unit 55 and the contact portions 26 of the first measuring element 23 and the second measuring element 24 are positioned inside the workpiece 200. The closing operation of the first measuring element 23 and the second measuring element 24 is released, and the contact portion 26 of the first measuring element 23 and the second measuring element 24 is brought into contact with the inner peripheral surface 200d of the workpiece 200.

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

  The control device 14 specifies the maximum value Lmax of the distance between the first probe 23 and the second probe 24 from the detection result in the distance detector 22 as the inner diameter of the workpiece 200.

  According to the workpiece dimension measuring apparatus 50 according to 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 the workpiece, the first measuring element, and the second measuring element when measuring the workpiece dimension in the workpiece dimension measuring apparatus according to the third embodiment of the present invention. FIG. 12 is a graph showing a change in the distance between the first measuring element and the second measuring element with the movement of the measuring unit in the workpiece dimension measuring apparatus in FIG.

  Compared with the workpiece dimension measuring apparatus 10 in the first embodiment, the workpiece dimension measuring apparatus in the present embodiment basically has the same structure. Hereinafter, the description of the overlapping structure will not be repeated.

  Referring 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 the constricted portion 301 in the workpiece 300 having the constricted portion 301.

  When measuring the workpiece dimensions, the workpiece 300 is placed on the placement surface 34a. The workpiece 300 is placed on the placement surface 34a so that the diameter of the constricted portion 301 continuously changes in the direction orthogonal to the placement surface 34a.

  At the time of measuring the workpiece dimensions, the workpiece 300 placed on the stage 34 is fixed, while the measuring unit 21 is provided so as to be movable in the direction indicated by the arrow 104 in FIG. 11 by a moving mechanism unit (not shown). It has been. The moving direction of the measuring unit 21 is a direction orthogonal to the direction in which the first measuring element 23 and the second measuring element 24 face each other and orthogonal to the placement surface 34a.

  At the time of measuring the workpiece dimensions, the abutting portion 26 of the first measuring element 23 and the second measuring element 24 is brought into contact with the constricted portion 301 of the workpiece 300, and the measuring unit 21 is moved to the arrow 104 by a moving mechanism (not shown). 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 measuring element 23 and the second measuring element 24 detected by the distance detecting unit 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 in the distance detector 22 as the minimum diameter of the constricted portion 301.

  According to the workpiece size measuring apparatus according to 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 workpiece and a measurement unit when measuring the workpiece dimension in the workpiece dimension measuring apparatus according to the fourth embodiment of the present invention. FIG. 14 is a graph showing a change in the distance between the first measuring element and the second measuring element accompanying the movement of the measuring unit in the workpiece dimension measuring apparatus in FIG.

  Compared with the workpiece dimension measuring apparatus 10 in the first embodiment, the workpiece dimension measuring apparatus in the present embodiment basically has the same structure. Hereinafter, the description of the overlapping structure will not be repeated.

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

  When measuring the workpiece dimensions, the workpiece 400 is placed on the placement surface 34a. The workpiece 400 is placed on the placement surface 34a so that the keyway 401 extends in a direction parallel to the placement surface 34a.

  When measuring the workpiece dimensions, the workpiece 400 placed on the stage 34 is fixed, while the measuring unit 21 is provided so as to be movable in the direction indicated by the arrow 105 in FIG. 13 by a moving mechanism unit (not shown). It has been. The moving direction of the measuring unit 21 is a direction orthogonal to the direction in which the first measuring element 23 and the second measuring element 24 face each other and parallel to the placement surface 34a.

  When measuring the workpiece dimensions, the moving portion (not shown) moves the measuring portion 21 to the arrow 105 while the abutting portion 26 of the first measuring piece 23 and the second measuring piece 24 is brought into contact with the inner surface of the keyway 401. 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 probe 23 and the second probe 24 detected by the distance detector 22 changes as shown in FIG.

  The control device 14 first specifies 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 in the distance detector 22 as the minimum width of the keyway 401, Further, the minimum value Lmin2 of the minimum value Lmin1 and the minimum value Lmin2 is specified.

  It should be noted that the present invention can be applied to the measurement of the maximum width of the keyway and the minimum or maximum width of the key in the same manner as the measurement of the minimum width of the keyway 401 described above.

  According to the workpiece dimension measuring apparatus in the fourth embodiment of the present invention configured as described above, the effects described in the first embodiment can be similarly obtained.

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

  FIG. 15 is a flowchart showing a workpiece dimension measurement flow in the fifth embodiment of the present invention. In the flowchart shown in FIG. 15, it is assumed that the outer diameter of the workpiece 100 is measured using the workpiece dimension measuring apparatus 10 according to the first embodiment.

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

  Next, the first measuring element 23 and the second measuring element 24 at the time when the first measuring element 23 and the second measuring element 24 come into contact with the outer peripheral surface 100c of the workpiece 100 in the step of S101. An initial value of the distance between them is specified (S102).

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

  If it is determined in step S104 that the distance between the first measuring element 23 and the second measuring element 24 increases from the initial value, the movement of the workpiece 100 and the distance between the first measuring element 23 and the second measuring element 24 are determined. The measurement of the workpiece dimensions is continued by continuing the detection of the change in distance (S105). Next, the control device 14 specifies the maximum value Lmax of the distance between the first measuring element 23 and the second measuring element 24 as the outer diameter of the workpiece 100 (S106).

  On the other hand, if it is determined in step S104 that the distance between the first measuring element 23 and the second measuring element 24 decreases from the initial value, the measurement of the workpiece dimension is stopped (S107). Next, the first measuring element 23 and the second measuring element 24 are opened to retract the workpiece 100 from the measuring unit 21 (S108). Thereafter, the process returns to step S101.

  When the distance between the first measuring element 23 and the second measuring element 24 decreases from the initial value, the maximum value of the distance between the first measuring element 23 and the second measuring element 24 even if the workpiece dimension measurement is continued as it is. Lmax cannot be obtained. For this reason, the measurement efficiency of a workpiece dimension can be improved by stopping the measurement of the workpiece dimension at an early stage and executing the step of S101 again.

  In the step of S101 to be re-executed, the first measuring element 23 and the second measuring element 24 in the previous step of S101 are positioned at a position closer to the moving work than the position where the first measuring element 23 and the second measuring element 24 are in contact with the work 100. What is necessary is just to make the 1 measuring element 23 and the 2nd measuring element 24 contact | abut to the workpiece | work 100. FIG.

  FIG. 16 is a flowchart showing a modification of the work dimension measurement flow shown in FIG. In the flowchart shown in FIG. 16, it is assumed that the minimum diameter of the constricted portion 301 of the workpiece 300 is measured using the workpiece dimension measuring apparatus in the third embodiment.

  Referring to FIG. 16, the work dimension measurement flow in the present modification mainly differs from the work dimension measurement flow shown in FIG. 15 in step S104. In the present modification, in step S104, the control device 14 determines that the distance between the first probe 23 and the second probe 24 is the first probe 23 and the second probe 24 identified in step S102. It is determined whether or not the distance between the initial values decreases.

  If it is determined in step S104 that the distance between the first measuring element 23 and the second measuring element 24 is reduced from the initial value, the workpiece dimension measurement is continued (S105). On the other hand, if it is determined in step S104 that the distance between the first measuring element 23 and the second measuring element 24 is increased from the initial value, the measurement of the workpiece dimension is stopped (S107).

  According to the workpiece dimension measuring apparatus 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 a workpiece dimension measurement flow applicable to the workpiece dimension measuring apparatus in the first to fourth embodiments will be described.

  FIG. 17 is a flowchart showing a flow of measuring a workpiece dimension in the sixth embodiment of the present invention. In the flowchart shown in FIG. 17, it is assumed that the outer diameter of the workpiece 100 is measured using the workpiece dimension measuring apparatus 10 according to the first embodiment.

  Referring to FIG. 17, first, the master workpiece diameter of the workpiece 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 a machining tolerance range of the workpiece 100. As an example, the master workpiece diameter is set to the median value of the machining tolerance of the workpiece 100.

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

  Next, the first measuring element 23 and the second measuring element 24 at the time when the first measuring element 23 and the second measuring element 24 contact the outer peripheral surface 100c of the workpiece 100 in the step of S112. An initial value of the distance between them is specified (S113).

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

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

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

  When it is determined that the difference between the master workpiece diameter and the initial value exceeds a predetermined value, the position where the first measuring element 23 and the second measuring element 24 abut on the workpiece 100 in step S112 is the maximum of the workpiece 100. It can be considered that it is far away from the diameter portion. For this reason, the workpiece dimension measurement efficiency can be improved by stopping the workpiece dimension measurement at an early stage and executing the step of S112 again.

  According to the workpiece dimension measuring apparatus in the sixth embodiment of the present invention configured as described above, the effects described in the first embodiment can be similarly obtained.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention is applied to a workpiece dimension measuring apparatus for measuring a dimension of a specific part of a workpiece.

  10, 50 Work size measuring device, 12 cart, 14 control device, 16 display device, 21 measuring unit, 22 distance detecting unit, 23 first measuring unit, 24 second measuring unit, 25 arm unit, 26 contact unit, 26a Opposing surface, 31 plate material, 32, 51 measuring unit support unit, 34 stage, 34a mounting surface, 35, 55 moving mechanism unit, 36, 56 motor, 37, 57 linear motion conversion 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 (6)

A measuring unit having a first measuring element that contacts the workpiece, and a second measuring element that is disposed to face the first measuring element across the workpiece, and that contacts the workpiece;
While the first measuring element and the second measuring element are brought into contact with the workpiece, the workpiece and the measuring unit are relatively moved in a direction orthogonal to the direction in which the first measuring element and the second measuring element face each other. A moving mechanism unit for moving,
The measurement unit further includes a distance detection unit that detects a distance between the first measurement unit and the second measurement unit that changes with relative movement between the workpiece and the measurement unit, and
A workpiece dimension measuring apparatus comprising: a control device that specifies a maximum value or a minimum value of a distance between the first measuring element and the second measuring element as a dimension of a specific part of the workpiece from a detection result in the distance detecting unit. A base member having a placement surface on which the workpiece is placed;
The moving mechanism unit moves the workpiece and the measuring unit relatively in a direction perpendicular to the direction in which the first measuring element and the second measuring element face each other and parallel to the placement surface, The workpiece dimension measuring apparatus according to claim 1.   3. The workpiece dimension measuring device according to claim 1, wherein each of the first measuring element and the second measuring element has a convex surface that protrudes toward the workpiece, and includes a contact portion that contacts the workpiece at a tip thereof. The controller is
Specifying an initial value of the distance between the first and second measuring elements when the first and second measuring elements are in contact with a workpiece;
When the distance between the first measuring element and the second measuring element increases from the initial value as the workpiece and the measuring unit move relative to each other, the measurement is continued. When the distance between the first probe and the second probe decreases with the relative movement, the measurement is stopped.
4. The maximum value of the distance between the first measuring element and the second measuring element is specified as a dimension of a specific part of the workpiece from a detection result in the distance detecting unit. 5. Workpiece dimension measuring device. The controller is
Specifying an initial value of the distance between the first and second measuring elements when the first and second measuring elements are in contact with a workpiece;
When the distance between the first measuring element and the second measuring element decreases from the initial value as the workpiece and the measuring unit move relative to each other, the measurement is continued, When the distance between the first probe and the second probe increases with the relative movement from the initial value, the measurement is stopped.
4. The minimum value of the distance between the first measuring element and the second measuring element is specified as a dimension of a specific part of the workpiece from a detection result in the distance detecting unit. 5. Workpiece dimension measuring device. A reference dimension value of a specific part of the workpiece is input to the control device,
The controller is
Specifying an initial value of the distance between the first and second measuring elements when the first and second measuring elements are in contact with a workpiece;
If the difference between the initial value and the reference dimension value is less than or equal to a preset predetermined value, the measurement is continued, and the difference between the initial value and the reference dimension value is a preset predetermined value. The workpiece dimension measuring apparatus according to any one of claims 1 to 5, wherein the measurement is stopped when exceeding.

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