JP2005308467A - Apparatus for measuring deflection of seat of stepped hole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a measuring apparatus allowing precise measurement of deflection of a seat of a stepped hole under a simple structure. <P>SOLUTION: With a chuck jaw 13 seated on the seat F, an intermediated sleeve 6, which is threadably mounted on a control knob 27, is lowered through the rotation of the control knob 27, and each chuck jaw 13 is slid in the diameter expansion direction to chuck a large-diameter hole h1 of the stepped hole H. With a control flange section 31 held, a measuring rod 7, together with a probe 33 at the lower end thereof, is rotated along the seat F. The deflection of the seat F is transmitted to a probe 32 of a dial gauge 4 through the probe 33 and the measuring rod 7. An indication by an indicator of the dial gauge 4 is read through visual inspection as the deflection of the seat. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an apparatus for measuring a runout of a seating surface in, for example, a stepped hole after machining, and in particular, a predetermined step at a boundary portion between a large diameter hole formed in a workpiece and a small diameter hole on the back side. It is related with the apparatus which measures the shake | deflection of the annular seat surface formed.

  For example, in an automobile gear case (gear carrier) or the like, an annular seating surface is formed with a predetermined step at the boundary between a large-diameter hole that functions as a shaft hole and a small-diameter hole on the back side. In some cases, this seating surface may be used as a bearing seating surface. In this case, it is necessary to measure the runout of the seating surface together with the diameter of the large-diameter hole after machining such as boring.

In such a so-called stepped hole seat surface run-out measurement, for example, as described in Patent Document 1, it is common to move a dial gauge or a lever type dial gauge against a seat surface to be measured. In this case, the dial gauge is moved along the seat surface after centering the movement track of the dial gauge and the seat surface (or large diameter hole or small diameter hole) in advance using a mandrel or the like. Efficient.
Utility Model Registration No. 3008007 (Fig. 1)

  However, if a mandrel or the like is used, the internal space of the large-diameter hole or small-diameter hole will be occupied thereby, making it impossible to apply the dial gauge to the seat surface in an appropriate posture, and so-called direct measurement of the seat surface is difficult. Become.

  In such a case, the measurement is performed using a so-called coordinate measuring machine, but not only is it portable, but the equipment becomes large, and so-called in-line measurement becomes difficult. Still, there is room for improvement.

  The present invention has been made paying attention to such problems, and in particular, provides a measuring apparatus that can easily and accurately measure runout of a stepped hole seat surface with a portable and simple structure. It is.

  The invention according to claim 1 is an apparatus for measuring a runout of an annular seating surface formed with a predetermined step at a boundary portion between a large-diameter hole formed in a workpiece and a small-diameter hole on the back side. It is assumed that there is.

  The apparatus itself includes the following elements (a) to (d).

  (A) Holder.

  (B) A chuck that is attached to the tip of the holder and controls centering and relative positioning between the seating surface and the holder by chucking the inner peripheral surface of the large-diameter hole by an inner diameter gripping method.

  (C) A measuring rod which is mounted on the holder so as to be slidable in the axial direction and rotatable about the axial center, and has a probe contacting the seating surface to be measured at the tip.

  (D) Instructing or outputting the relative displacement between the holder and the measuring rod when the measuring rod is rotated while the measuring element is in contact with the seating surface and attached to the other end of the holder as the seating surface deflection. Measuring means.

  In this case, as a measuring means, in addition to a type in which mechanical displacement is converted into an electric or electromagnetic signal and output and then indicated or recorded, the measuring means is detachably attached to the other end of the holder as described in claim 2 It is assumed that a dial gauge is used. That is, it is possible to use a linear motion linear displacement sensor or the like other than the dial gauge as the measuring means.

  Further, as described in claim 3, the chuck has a plurality of chuck claws arranged radially and slidable in the radial direction of the large-diameter hole, and a chucking operation with a contraction and expansion operation based on the slide displacement of the chuck claws. It is desirable to have a chuck claw operating means for king and unchucking operations.

  Therefore, in at least the invention described in claim 1, even when the width of the seating surface to be measured is relatively small, the chuck is chucked so that the inner peripheral surface of the large-diameter hole is used as a reference. Then, centering and relative positioning between the seating surface to be measured and the holder are performed, and measurement is possible. In this state, if the measuring rod is rotated and the probe at the tip of the measuring rod is moved along the seating surface, the vibration of the seating surface is converted into displacement in the axial direction of the measuring rod. It is output as an instruction or an electric signal in a state where it can be visually observed by the measuring means.

  According to the first aspect of the present invention, it is possible to accurately measure the runout of the seating surface having a relatively small width while having a simple portable structure. Further, it is only necessary to rotate the measuring rod after chucking the large-diameter hole with the chuck, the measuring operation is extremely easy, and no skill is required for the measuring operation.

  1 to 4 are diagrams showing a more specific embodiment of the present invention. In particular, FIG. 1 is a cross-sectional explanatory view thereof, FIG. 2 is a view taken along the line AA of FIG. 1 shows a bottom view of FIG.

  As shown in FIG. 1, the workpiece W has a large-diameter hole h1 that functions as a shaft hole and a small-diameter hole h2 on the deeper side than the so-called stepped hole H. Is formed. A seating surface F is formed at the boundary between the large-diameter hole h1 and the small-diameter hole h2 with a step corresponding to the difference in diameter between the holes h1 and h2. In this embodiment, the seat surface F is shaken. Measured. In the product stage, since the portion corresponding to the large-diameter hole h1 functions as a bearing housing portion (not shown), the seat surface F functions as a seating surface of the bearing. The shake measurement gauge 1 as a measuring device is positioned in an upright posture or a self-standing posture with reference to the large-diameter hole h1, and then used for measurement work.

  The run-out measurement gauge 1 is roughly divided into a cylindrical holder 2, a so-called three-claw type chuck 3 of an inner diameter chuck (gripping) type attached to the lower end portion of the holder 2, and a detachable attachment to the upper end portion of the holder 2. It comprises a dial gauge 4 as a measuring means attached.

  The holder 2 includes a holder main body 5 with a flange portion 11 that functions as an outer cylinder, and an intermediate sleeve 6 as an inner cylinder that is slidably inserted in the holder main body 5 in the vertical direction (axial direction). It is formed as a heavy cylinder structure, and the intermediate rod 6 is inserted through the intermediate sleeve 6 so as to be slidable in the vertical direction (axial direction) and rotatable around the axial center. Has been. A male threaded portion 8 is formed at the upper end of the intermediate sleeve 6, while a tapered surface 9 is formed on the outer periphery of the lower end of the intermediate sleeve 6.

  In addition, since the holder main body 8 functions as a handle part, the rough surface part 10 is formed in the outer peripheral surface by knurling.

  A chuck 3 comprising a disc-shaped chuck body 12 and a plurality of (three in this embodiment) chuck claws 13 is mounted on the flange 11 at the lower end of the holder body 5, while The dial gauge 4 is detachably attached to the end face via an extension plate 15, a dial collar 16 and a knob knob 17 in addition to the mounting bracket 14. That is, the stem 18 of the dial gauge 4 is inserted and supported by the extension plate 15 via the dial collar 16 and is fastened and fixed by the knob knob 17.

  As shown in FIG. 3, the chuck body 12 is formed with a total of six groove portions 19 in a radial pattern, and each of the groove portions 19 is slidable with every other chuck claw 13 having a substantially L shape. The chuck body 12 is accommodated in the radial direction of the body 12 so as to be able to be expanded and contracted, and the chuck body 12 is fixed to the flange portion 11 of the holder body 5 with a plurality of bolts 20. On the inner peripheral surface side of each chuck claw 13, a driven-side taper surface 21 that comes into contact with the taper surface 9 on the intermediate sleeve 6 side is formed, while each chuck claw 13 is mounted on the flange portion 11. The amount of slide displacement is regulated by the set screw 22 and the elongated hole 23 on the side of the chuck claw 13 engaged therewith.

  Further, a ring receiving groove 24 is formed on the outer peripheral surface of each chuck claw 13, and each ring receiving groove 24 is compared as a single ring-shaped elastic member shared by each chuck claw 13. A large-diameter O-ring 25 is attached. As a result, an elastic urging force in the diameter reducing direction is always applied to each chuck claw 13, and the tapered surface 21 is always in pressure contact with the tapered surface 9 on the intermediate sleeve 6 side.

  As is clear from FIG. 1, these chuck claws 13 chuck the large diameter hole h1 by a so-called inner diameter gripping method using the inner peripheral surface of the large diameter hole h1 as a reference portion. When the large-diameter hole h1 is chucked while seated on F, the stepped hole H including the seat surface F and the runout measurement gauge 1 are relatively positioned with respect to the inner peripheral surface of the large-diameter hole h1. At the same time, both centers will be autonomous.

  A circumferential groove 26 is formed at the upper end of the holder body 6, and a ring-shaped operation knob 27 is attached so as to overlap the circumferential groove 26. The operation knob 27 has an inner peripheral female screw portion 28 screwed into the male screw portion 8 on the intermediate sleeve 6 side, and a plurality of parallel pins 29 driven from the outer peripheral surface side of the operation knob 27 are provided with a holder body. It is engaged with the circumferential groove 26 on the 6th side. Thereby, the operation knob 27 is rotatably supported by the holder body 6 in a state in which the operation knob 27 is prevented from being detached from the holder body 6. Accordingly, since the male thread portion 8 on the intermediate sleeve 6 side and the female thread portion 28 on the operation knob 27 side are screwed together, the intermediate sleeve 6 moves up and down when the operation knob 27 is rotated, and accordingly, Each chuck claw 13 performs a chucking and unchucking operation.

  As is clear from the above description, the chuck claw operating means 30 is formed by the intermediate sleeve 6, the operation knob 27, the tapered surfaces 9, 21 and the O-ring 25 and the like. A rough surface portion 27a is formed on the outer peripheral surface of the operation knob 27 that functions as a handle portion by knurling.

  The measuring rod 7 penetrates the intermediate sleeve 6 described above, and an operation flange portion 31 that functions as a handle portion is integrally formed at the upper end portion thereof, and the dial gauge 4 is formed at the upper end surface thereof. The contact 32 is in contact. A rough surface portion 31 a is formed on the outer peripheral surface of the operation flange portion 31 by knurling. On the other hand, a measuring element 33 having a spherical portion 33a is connected to the lower end of the measuring rod 7 by a set screw 34, a washer 35 and a bolt 36, and as is apparent from FIG. 1, the chuck 3 has a large diameter hole h1. The arm length of the measuring element 33 is set so that the spherical portion 33a at the tip of the measuring element 33 reaches the seat surface F without interfering with the chuck claw 13 in the state where the measuring element 33 is held. A play α is set between the measuring rod 7 and the chuck body 12 that controls the downward movement of the measuring rod 7, and between the measuring element 33 and the chuck body 12. A return spring (compression coil spring) 37 is interposed. As a result, the entire measuring rod 7 including the probe 33 is pulled downward, and as a result, the probe 33 is pressed against the seat surface F.

  Next, the procedure of shake measurement by the shake measurement gauge 1 configured as described above will be described.

  First, prior to actual measurement, the zero adjustment of the runout measurement gauge 1 is performed. Specifically, as shown in FIG. 4, a master gauge G simulating the mutual relationship between the large-diameter hole h1, the small-diameter hole h2 and the seating surface F on the workpiece W side is prepared in advance. On the other hand, the runout measurement gauge 1 is set in the same manner as in FIG. Then, after confirming that the measuring rod 7 is lifted from the chuck body 12 by a play α to be in a so-called floating state, and the dial gauge 4 moves according to the movement of the measuring rod 7, the dial gauge in a stationary state The dial is adjusted so that the instruction by the pointer 4 becomes “0”.

  In performing actual measurement, as shown in FIG. 1, the chuck 3 is previously unchucked so that the chuck claws 13 do not contact the inner peripheral surface of the large-diameter hole h1, and the holder 3 Grab the main body 5 and erect the runout measurement gauge 1 that has already been adjusted to zero so that the chuck claws 13 are in uniform contact with the seating surface F on the workpiece W side. In this state, the chuck 3 is chucked by rotating the operation knob 27, and each chuck claw 13 is pressed against the inner peripheral surface of the large-diameter hole h1 to chuck the workpiece W by the so-called inner diameter chuck method. To do.

  That is, when the operation knob 27 is rotationally operated, the intermediate sleeve 6 is lowered by its screwing action, and the chuck claws 13 are gradually slid in the diameter-expanding direction due to the contact between the tapered surfaces 9 and 21. The inner peripheral surface of the large-diameter hole h1 is chucked using the reference portion. When chucking is completed, centering (centering) and relative positioning of the seating surface F and the runout measurement gauge 1 with respect to the inner peripheral surface of the large-diameter hole h1 are performed at the same time. Then, the measuring rod 7 is lifted by a play α to be in a so-called floating state, while the spherical portion 33a of the measuring element 33 is pressed against the seating surface F.

  In this state, when the measuring rod 7 is rotated by grasping the operating flange portion 31, the spherical portion 33 a of the measuring element 33 travels on the seating surface F and performs so-called tracing, and the deflection of the seating surface F is the measuring member 33. Is converted into a vertical displacement of the measuring rod 7, and finally the deflection is measured with the movement of the pointer of the dial gauge 4. That is, since the deflection of the seating surface F is instructed by the pointer of the dial gauge 4, the value is read visually as the value of the deflection.

  When the measurement is completed, the operation knob 27 is reversely rotated to cause the chuck 3 to be unchucked, and the runout measurement gauge 1 is removed from the workpiece W. That is, when the operation knob 27 is reversely operated to raise the intermediate sleeve 6, each chuck claw 13 to which the elastic urging force is applied by the O-ring 25 follows the movement of the intermediate sleeve 6 in the diameter reducing direction. Slid autonomously and become unchucked.

  As described above, according to the present embodiment, the runout gauge 1 having a portable and simple structure allows the runout of the seat surface F having a relatively small width in the stepped hole H to be easily and directly performed with high accuracy. It can be measured well.

  Here, when the slide displacement amount of each chuck claw 13 and the arm length of the probe 33 satisfy a predetermined condition, the runout measurement gauge 1 can handle the runout measurement of the seating surface of the stepped hole having a different size. be able to. Further, if the clamp pawl 13 or the measuring element 33 is replaced with one having a different size, it is possible to easily cope with the measurement of the seating surface of the stepped hole having a larger difference in size.

  Further, the O-ring 25 is only used for applying an elastic urging force to each chuck claw 13, so that it is of course possible to use other elastic urging means instead of the O-ring.

Cross-sectional explanatory drawing which shows more concrete embodiment of this invention. The arrow line view which follows the AA line of FIG. The bottom view of FIG. Sectional drawing of the master gauge used for the run-out measurement gauge of FIG.

Explanation of symbols

1 ... Run-out measurement gauge (run-out measuring device)
2 ... Holder 3 ... Chuck 4 ... Dial gauge (measuring means)
5 ... Holder body (outer cylinder)
6 ... Intermediate sleeve (inner cylinder)
7 ... Measurement rod 8 ... Male thread part 9 ... Tapered surface 12 ... Chuck body 13 ... Chuck claw 21 ... Tapered surface 25 ... O-ring (ring-shaped elastic member)
27 ... Operation knob 28 ... Female thread part 30 ... Chuck claw operating means 31 ... Operation flange part 33 ... Measuring element F ... Seat surface H ... Stepped hole h1 ... Large diameter hole h2 ... Small diameter hole W ... Workpiece

Claims (8)

An apparatus for measuring runout of an annular seating surface formed with a predetermined step at a boundary between a large-diameter hole formed in a workpiece and a small-diameter hole on the deeper side than the large-diameter hole,
A holder,
A chuck that is attached to the tip of the holder and that controls centering and relative positioning between the seating surface and the holder by chucking the inner peripheral surface of the large-diameter hole by an inner diameter gripping method,
A measuring rod that is slidable in the axial direction with respect to the holder and is rotatably mounted around the axial center, and has a probe that contacts a seating surface to be measured at the tip;
A measuring means attached to the other end of the holder and instructing or outputting the relative displacement between the holder and the measuring rod when the measuring rod is rotated while the probe is in contact with the seating surface as a swing of the seating surface; ,
An apparatus for measuring runout of a stepped hole seating surface.   2. The stepped hole seat runout measuring apparatus according to claim 1, wherein the measuring means is a dial gauge detachably attached to the other end of the holder. Chuck
A plurality of chuck claws arranged radially and slidable in the radial direction of the large-diameter hole;
Chuck claw operating means for performing chucking and unchucking operations with a diameter-expansion operation based on the slide displacement of those chuck claws,
The apparatus for measuring runout of a stepped hole seating surface according to claim 1, wherein: While the holder is formed as a double cylinder structure with a holder body that functions as an outer cylinder and an inner cylinder that is slidably inserted therein,
The tip of the inner cylinder is in taper contact with each chuck claw,
4. The runout of the stepped hole seating surface according to claim 3, wherein the inner cylinder functions as chuck claw operating means for chucking and unchucking each chuck claw according to its own slide displacement. measuring device.   The holder main body and the inner cylinder forming the holder are screwed directly or indirectly so that the chuck claws are chucked and unchucked according to the screwing action of the inner cylinder with respect to the holder main body. The apparatus for measuring runout of a stepped hole seating surface according to claim 4, wherein:   An operation knob rotatably mounted on the holder body is screwed into the inner cylinder, and each chuck claw is chucked and unchucked according to the screwing action of the inner cylinder based on the rotation operation of the operation knob. The stepped hole seat surface run-out measuring device according to claim 5, wherein   The stepped hole seat runout measuring device according to any one of claims 3 to 6, wherein an elastic biasing force in the direction of diameter reduction is constantly applied to each chuck claw. A single ring-shaped elastic member that is shared by each chuck claw is mounted on the outer peripheral surface side of each chuck claw,
8. The stepped hole seat surface run-out measuring device according to claim 7, wherein an elastic biasing force in the direction of diameter reduction is applied to each chuck claw with the ring-shaped elastic member.

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