JP2008139230A - Apparatus for measuring surface roughness of cylindrical object - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for measuring surface roughness of a cylindrical object capable of efficiently measuring the surface roughness of a plurality of cylindrical objects. <P>SOLUTION: After a plurality of cylindrical objects (workpieces) 11 to be measured are pinched by two tool counterparts 13 in tight contact with each other and intermediate members 14 including a protrusion 14c having a tapered surface 14b are mounted at both ends, a circular flat-plate-shaped coupling member 16 including a tapered opening 16b is fitted with the protrusion 14c to have the two counterparts 13 integrated. In measuring, after a workpiece holding tool 12 holding a plurality of workpieces 11 is fixedly located on a tool seat 17, a tip of a gauge head 21a is brought into contact with an inner peripheral surface of the workpiece 11 through the opening 16b of the coupling member 16, and the gauge head 21a is moved back and forth in the thickness direction of the workpiece 11 to measure the surface roughness on the inner peripheral surface of the workpiece 11. This constitution enables successive measuring of the plurality of workpieces 11 by a single measuring operation, thereby improving measuring efficiency. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an apparatus for measuring the surface roughness of a cylindrical workpiece.

  2. Description of the Related Art Conventionally, there has been known a surface roughness measuring device for measuring the surface roughness of various workpieces having a cylindrical shape or a columnar shape and knowing the molding state of the workpiece such as roundness based on the measurement result. (For example, see Patent Documents 1, 2, and 3)

  FIG. 5 is a diagram schematically showing a cylindrical surface roughness measuring apparatus according to the prior art. In the surface roughness measuring apparatus shown here, a rotary table 2 for placing a cylindrical workpiece 1 as an object to be measured is installed on a pedestal 3, and on the other hand, the surface roughness of the workpiece 1 is measured. A movable part 5 holding a measuring element 4 is held by a column 6 standing on the base 3 so as to be movable up and down.

When measuring the surface roughness of the workpiece 1, the workpiece 1 is placed and positioned on the rotary table 2, and the tip of the measuring element 4 is brought into contact with the outer peripheral surface or inner peripheral surface (here, the outer peripheral surface) of the workpiece 1. In this state, the turntable 2 is rotated. With the rotation of the turntable 2, the measuring element 4 reads the surface state of the work 1, and the roundness of the work 1 is calculated based on the result.
JP-A-5-231804 JP-A-8-122050 JP 2006-125924 A

  Conventional surface roughness measuring devices for cylindrical bodies measure one workpiece, and only one workpiece can be measured in one measurement. When processing multiple workpieces, each workpiece is measured each time. Therefore, there is a problem that the measurement efficiency is poor.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a cylindrical surface roughness measuring apparatus with improved measurement efficiency.

  A workpiece holding jig provided with at least two divided bodies that sandwich a plurality of cylindrical bodies that are measured objects, a jig base that positions and holds the workpiece holding jig, and a surface roughness of the cylindrical body. An apparatus for measuring the surface roughness of a cylindrical body having a measuring means for measuring.

  An intermediate member provided with a protruding portion having a tapered surface on the outer peripheral portion is attached to both ends of the plurality of divided bodies provided in the work holding jig, and an inner peripheral portion is provided on the protruding portion of the intermediate member. A connecting member having an opening having a tapered surface is fitted into the cylindrical body, and the surface roughness measuring device for the cylindrical body is integrated with the plurality of divided bodies.

  The connecting member is provided with a positioning pin, and when the positioning pin is fitted into a positioning hole provided in the jig base, the connecting member is positioned and fixed to the jig base and is fitted into the positioning hole. The cylindrical body surface roughness measuring apparatus is capable of changing the holding angle of the workpiece holding jig stepwise by replacing the positioning pins.

  The workpiece holding jig has a cylindrical shape and is a cylindrical surface roughness measuring device held by an inclined portion having a V-shaped cross section formed on the jig base.

  According to the surface roughness measuring apparatus for a cylindrical body according to the present invention, a plurality of workpieces that are objects to be measured can be held together by a split-type holding jig and measured at a time, so that measurement efficiency is improved. To do.

  FIG. 1 is an exploded perspective view showing a workpiece holding jig according to a cylindrical body surface roughness measuring apparatus according to the present invention, and FIG. 2 is an inspection target in one of the jig divided bodies constituting the workpiece holding jig. It is a front view, a side view, a top view, a cross-sectional view, and a perspective view showing a state in which a work is incorporated. In the present invention, a cylindrical body to be measured for surface roughness, i.e., a cylindrical body (hereinafter referred to as a workpiece) 11 here, is formed of two jigs having a semi-cylindrical shape included in the workpiece holding jig 12 shown in FIG. A plurality (four in this case) are held together between the component divisions 13. A semicircular cutout portion 13a is formed at the center of the dividing surface of the jig divided body 13 so as to follow the outer shape of the workpiece 11, and the plurality of workpieces 11 are aligned in a row in close contact with each other.

  Here, the diameter of the semicircular notch 13a formed at the center of the dividing surface of the jig divided body 13 is set to be slightly larger (for example, about 10 to 20 μm) than the outer diameter of the work 11, Although the work 11 is sandwiched between the two jig divided bodies 13, it is not firmly tightened and is held with an appropriate holding force within a range in which the work 11 does not play. By doing so, there is no possibility that the workpiece 11 is deformed by the fastening force itself of the jig divided body 13 when the strength of the workpiece 11 is relatively weak. However, when there is no possibility that the workpiece 11 is deformed, the jig divided body 13 may be firmly tightened.

  A semicircular stepped portion 13b that is one step lower than the end face is formed at both ends of the jig divided body 13, and a semicircular intermediate member 14 is fitted into the stepped portion 13b. Both ends of the work 11 are locked and the movement in the alignment direction is restricted. The intermediate member 14 is provided with a connecting pin 15 projecting to the back surface side, and the connecting pin 15 is fitted into a hole 13c provided on the bottom surface of the stepped portion 13b of the jig divided body 13 so as to be intermediate. The member 14 is fixed to the jig divided body 13.

  In the center of the flat edge of the intermediate member 14, a semicircular cutout portion 14 a having a smaller diameter than the semicircular cutout portion 13 a formed in the jig divided body 13 is provided. A part of the end face including the whole is exposed.

  Further, on the surface side of the intermediate member 14, a substantially semicircular conical protrusion 14c having a relatively gentle tapered surface 14b is provided, and the two jig divided bodies 13 are combined with each other. A circular flat plate-like connecting member 16 is attached. A circular opening 16b having a tapered surface 16a following the shape corresponding to the protruding portion 14c of the intermediate member 14, that is, the outer peripheral surface (tapered surface 14b) of the protruding portion 14c, is provided at the center of the connecting member 16. Then, the protruding portion 14c of the intermediate member 14 is pushed into and fitted therewith, so that the two jig divided bodies 13 are tightened and integrated in a direction close to each other via the intermediate member 14.

  As described above, when integrating the two jig divided bodies 13, it is only necessary to push the connecting member 16 into the protruding portion 14 c of the intermediate member 14, so that the work 11 can be easily incorporated into the work holding jig 12. Can be done. Further, since the connecting member 16 moves along the tapered surface 16a of the opening 16b, the center axis of the opening 16b and the center axis of the work 11 can be easily centered.

  FIG. 3 is a view showing a state in which the workpiece holding jig is installed on the jig base. The workpiece holding jig 12 is connected to the connecting member 16 of the workpiece holding jig 12 as shown in FIG. Positioning pins 18 are positioned for positioning. In this embodiment, two positioning pins 18 are arranged so as to face each other across the central axis of the connecting member 16, and another pair of positioning pins 18 are arranged so as to be orthogonal to a line segment connecting them.

  The workpiece holding jig 12 is placed in a state in which the outer peripheral surface is in contact with the inclined portion 17 a having a V-shaped cross section formed on the jig base 17, and one of the positioning pins 18 implanted in the connecting member 16 is It is positioned and fixed by fitting into a U-shaped positioning hole (slit) 19 a of the plate-like member 19 fixed to the side end of the jig base 17.

  The workpiece holding jig 12 is automatically positioned to a certain extent in the lateral direction only by being placed on the inclined portion 17a of the jig base 17, and the positioning pin 18 is fitted into the positioning hole 19a to be accurately fixed. It will be in the state.

  Here, by replacing the positioning pin 18 fitted in the positioning hole 19a of the plate-like member 19, the holding angle around the center axis of the workpiece holding jig 12 with respect to the jig base 17 can be changed stepwise. is there. In the present embodiment, the four positioning pins 18 are arranged so as to form the vertices of the square, and the work holding jig 12 can be rotated stepwise by 90 °. In addition, it is also possible to rotate at other angles by changing the number and arrangement of the positioning pins 18. As described above, the work holding jig 12 can be rotated easily and accurately by simply replacing the positioning pins 18.

  FIG. 4 is a front view, a side view, a top view, and a perspective view schematically showing a cylindrical surface roughness measuring apparatus according to the present invention. A jig base 17 shown in FIG. 3 is installed on the base 20 serving as the base of the measuring apparatus while holding the work holding jig 12, and measurement for measuring the surface roughness of the work 11. Part 21 is installed.

  The measuring unit 21 includes a measuring element 21a that contacts the inner peripheral surface of the work 11 and measures the surface roughness, a movable part 21b that holds the measuring element 21a so as to advance and retreat in the thickness direction of the work 11, and a movable part 21b. The surface of the inner peripheral surface of the work 11 is roughened by moving back and forth in the thickness direction of the work 11 in a state where the tip of the measuring element 21a is in contact with the inner peripheral surface of the work 11. That is, fine unevenness and distortion of the surface in the thickness direction of the work 11 are measured.

  At this time, since the four workpieces 11 are held in close contact with each other on the workpiece holding jig 12, the measuring element 21a continuously moves the workpieces 11 from the end in one measurement operation (advancement / retraction operation). And all the workpieces 11 are measured. Note that the separation between adjacent workpieces is recognized by detecting an abrupt change in the surface state that occurs when the probe 21a passes between the workpieces.

  When measuring another surface of the inner peripheral surface of the workpiece 11, the workpiece holding jig 12 is once removed from the jig base 17, and the workpiece holding jig 12 is rotated about the central axis, and then another positioning pin 18 is used. Is fitted into the positioning hole 19a of the plate-like member 19 to be positioned and fixed. In this state, the measuring element 21a is advanced and retracted, and the same measuring operation is repeated.

  In this embodiment, only the surface roughness in the thickness direction of the inner peripheral surface of the workpiece 11 is measured by moving the probe 21a forward and backward, but the workpiece holding jig 12 is continuously rotated around the central axis by an arbitrary rotation mechanism. Thus, the surface roughness of the inner peripheral surface of the work 11 in the rotating direction can be measured.

  Note that the workpiece to be measured by the surface roughness measuring apparatus of the present invention is not limited to a cylindrical body, and is a cylindrical workpiece with a hollowed center portion, so long as it does not depart from the spirit of the present invention. Then, it doesn't matter what.

The disassembled perspective view which shows the workpiece holding jig which concerns on the surface roughness measuring apparatus of the cylindrical body by this invention Front view, side view, top view, cross-sectional view, and perspective view showing a state in which a workpiece to be inspected is incorporated in one of the jig divisions constituting the work holding jig The figure which shows the state which installed the work holding jig on the jig base The front view, side view, top view, and perspective view which show typically the surface roughness measuring apparatus of the cylindrical body by this invention Front view schematically showing a surface roughness measuring device for a cylindrical body according to the prior art

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Work 2 Rotary table 3 Base 4 Measuring element 5 Movable part 6 Column 11 Work 12 Work holding jig 13 Jig division 13a Notch part 13b Step part 13c Hole part 14 Intermediate member 14a Notch part 14b Tapered surface 14c Protrusion part 15 Connection Pin 16 Connecting member 16a Tapered surface 16b Opening 17 Jig base 17a Inclined part 18 Positioning pin 19 Plate-like member 19a Positioning hole (slit)
20 base 21 measuring part 21a measuring element 21b movable part 21c supporting part

Claims (4)

  A workpiece holding jig provided with at least two divided bodies that sandwich a plurality of cylindrical bodies that are measured objects, a jig base that positions and holds the workpiece holding jig, and a surface roughness of the cylindrical body. A measuring device for measuring the surface roughness of a cylindrical body, characterized by comprising:   An intermediate member provided with a protruding portion having a tapered surface on the outer peripheral portion is attached to both ends of the plurality of divided bodies provided in the work holding jig, and an inner peripheral portion is provided on the protruding portion of the intermediate member. The tubular body surface roughness measuring apparatus according to claim 1, wherein a connecting member having an opening having a tapered surface is fitted to the plurality of divided bodies to be integrated.   The connecting member is provided with a positioning pin, and when the positioning pin is fitted into a positioning hole provided in the jig base, the connecting member is positioned and fixed to the jig base and is fitted into the positioning hole. The surface roughness measurement of the cylindrical body according to claim 1 or 2, wherein the holding angle of the workpiece holding jig can be changed stepwise by replacing the positioning pins. apparatus.   The surface roughness measurement of the cylindrical body according to claim 3, wherein the work holding jig has a cylindrical shape and is held by an inclined portion having a V-shaped cross section formed on the jig base. apparatus.

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