JP2017138157A - Depth measurement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a depth measurement method capable of measuring depth, especially the minimum depth and the maximum depth, in a range of the whole circumference of a circular measurement object such as an oil seal in a simple manner.SOLUTION: The depth of a measurement object W is measured from a detected value detected by a first probe 14 or a second probe 15 when the first probe 14 and the second probe 15 are rotated 180 degrees around a rotational axis 12 with respect to the measurement object W, and a detected value detected by the second probe 15 or the first probe 14 at the same detection position.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a depth measuring method, and more particularly, to a depth measuring method for measuring the depth of a circular measuring object such as a press-fitted part press-fitted into a press-fitted part.

  2. Description of the Related Art Conventionally, as a device for measuring the depth of a hole that accommodates a bearing or the like, for example, a device that measures a hole depth by extending a probe into a hole having a hole having a different diameter is known.

  As this type of prior art, Patent Document 1 includes a small-diameter probe and a large-diameter probe that are coaxially arranged as probes and move individually. A hole depth measuring device configured to move including a small diameter probe is disclosed.

  According to the prior art described in Patent Document 1, since a circular probe matched to the hole diameter is coaxially inserted and removed, the hole depth is measured without interference between the probe and an obstacle such as an oil seal. It is possible to manufacture and assemble bearings and the like with high accuracy.

JP-A-7-174502

  By the way, when measuring the depth of a press-fit part (press-fit depth) that is press-fitted into a press-fit part such as an oil seal, in order to ensure the assembly accuracy of the press-fit part, its entire circumference, especially its minimum and maximum depths. Depth needs to be measured.

  However, since the conventional technique described in Patent Document 1 uses a circular probe that matches the hole diameter, the probe hits at the position of the minimum depth, and only the minimum depth can be measured.

  It is also conceivable to use a probe that measures the depth at a single point, but such a probe cannot measure the minimum and maximum depths unless the entire circumference is scanned and measured. The problem that a lot of man-hours are required for the depth measurement occurs.

  The present invention has been made in view of the above-mentioned problems. With a simple method, the depth in the range of the entire circumference of a circular measurement object such as an oil seal, in particular, the minimum depth and the maximum depth are determined. An object of the present invention is to provide a depth measurement method that can be measured.

  In order to achieve the above object, a depth measurement method according to the present invention includes a rotation shaft, a first detection unit that is rotatably arranged around the rotation axis, and detects a depth of a measurement target, and the first detection unit. And a second detector that is arranged concentrically with the first detector and is rotatable about the rotation axis at a predetermined angular interval, and that detects the depth of the measurement object. A depth measurement method for measuring a depth of a measurement target of the first detection unit when the first and second detection units are rotated 180 degrees around the rotation axis with respect to the measurement target. Is a method of measuring the depth of the measurement object from the detection value detected by the second detection unit and the detection value detected by the second detection unit at the detection position.

  According to the present invention, the first detection unit arranged rotatably around the rotation axis, and the first detection unit concentrically with the first detection unit and rotatable around the rotation axis with a predetermined angular interval from the first detection unit. The arranged second detection unit is rotated 180 degrees around the rotation axis, and the detection value detected by the first detection unit at that time and the detection value detected by the second detection unit at the detection position are Since the depth of the measurement target is measured, the minimum depth and the maximum depth of the circular measurement target can be reliably measured without scanning the entire circumference.

It is the schematic which showed the main structures of the measuring apparatus with which the depth measuring method of this invention is applied, (A) is a partially notched top view, (B) is a partially notched side view. It is a figure which shows an example of the detected value detected by the 1st and 2nd probe shown in FIG. It is a figure explaining an example of the principle of the depth measuring method of this invention.

  Embodiments of the depth measurement method of the present invention will be described below with reference to the drawings.

  1A and 1B are schematic views showing the main configuration of a measuring apparatus to which the depth measuring method of the present invention is applied. FIG. 1A is a partially cutaway plan view, and FIG. 1B is a partially cutaway side view. FIG.

  The measuring apparatus 1 of the illustrated embodiment is, for example, the depth (press-fit) of an annular measurement object W such as an oil seal that is fitted into an annular groove formed between the parts A and B or C by press-fitting. Depth) and is mainly composed of a measurement unit 10 and a fixed unit 20.

  The measuring unit 10 of the measuring device 1 includes a support part 11 provided with a notch 11a extending in the lateral direction, a rotating shaft 12 rotatably supported by the support part 11 so as to penetrate the notch 11a, and a part thereof. In order to detect the depth of the measuring object W (depth in the direction of the rotating shaft 12) and the mounting plate 13 integrally connected to the rotating shaft 12 so as to be inserted into the notch 11a. The first probe (first detection unit) 14 and the second probe fixedly attached to the attachment plate 13 at a position away from the rotation axis O) by a predetermined distance R (corresponding to the radius of the annular measuring object W). A probe (second detection unit) 15. The first probe 14 and the second probe 15 are arranged concentrically with the radius R (on the same circumference), and are arranged with an angular interval α (0 ° <α <180 °) from each other. .

  In the illustrated example, a contact type probe is used as the first detection unit and the second detection unit for detecting the depth of the measurement target W, but a non-contact type using a laser or the like is used. Needless to say, it may be used.

  Further, here, the rotation shaft 12 is rotatably supported by the support portion 11, whereby the first probe 14 and the second probe 15 attached to the attachment plate 13 connected to the rotation shaft 12 are connected to the rotation shaft. The first probe is attached to the mounting plate 13 by, for example, fixing the rotating shaft 12 to the support portion 11 and rotatably mounting the mounting plate 13 on the rotating shaft 12. Of course, the 14 and the second probe 15 may be arranged so as to be rotatable around the rotary shaft 12.

  On the other hand, the fixing part 20 of the measuring device 1 is integrally connected to the support part 11 of the measuring part 10, and the measuring part 10 is connected to any one of the parts A, B, and C via the fixing part 20. Alternatively, the measurement unit 10 is positioned in a non-movable position and fixed so that the rotation axis O of the rotation shaft 12 of the measurement unit 10 matches the axis of the annular measurement target W, and the measurement unit 10 is the measurement target. It is arranged above W.

  In the measuring apparatus 1 having such a configuration, when the measuring unit 10 is fixed via the fixing unit 20 and the rotating shaft 12 of the measuring unit 10 is rotated, the first probe 14 and the second probe attached to the mounting plate 13 are used. 15 rotates around the rotation axis 12 (rotation axis O) and scans the annular measurement target W (the upper surface thereof), whereby the depth of the measurement target W is measured by the first probe 14 and the second probe 15. Can be detected.

  Here, in the annular measuring object W, the minimum depth and the maximum depth exist on the counter electrode (the opposite side to the rotating shaft 12). Therefore, if the first probe 14 and the second probe 15 are rotated by 180 ° about the rotation axis 12 (rotation axis O), the detection value (depth) detected by the first probe 14 or the second probe 15 is increased. ) Will include the minimum or maximum depth. The counter electrode at the position where the minimum depth or the maximum depth is detected (the side opposite to the rotating shaft 12) is the position of the maximum depth or the minimum depth.

  Further, since the detection value (depth) detected by the first probe 14 and the second probe 15 indicates a value corresponding to the inclination of the annular measurement target W (with respect to the annular groove or the like), the first probe The detected value (depth) detected by the first probe 14 and the second probe 15 while the 14 and the second probe 15 are rotated about the rotation axis 12 changes in a sine curve, and The detection value detected by the second probe 15 indicates a value shifted (phase changed) by the mounting angle interval α.

  FIG. 2 shows an example of detection values detected by the first probe 14 and the second probe 15, and in the example shown in FIG. 2, detection values detected by the first probe 14 and the second probe 15. Is displayed as a sine curve that is shifted by the mounting angle interval α, and the detected value detected by the first probe 14 and the second probe 15 includes the minimum depth. The minimum depth of the measuring object W is detected by the second probe 15.

  Accordingly, the first probe 14 and the second probe 15 are rotated by 180 ° with respect to the measurement object W around the rotation shaft 12 (rotation axis O), and at that time, the first probe 14 and the second probe 15 are rotated. No difference is actually detected by reading the difference between the minimum or maximum depth detected by one of the sensors and the depth detected by the other of the first probe 14 and the second probe 15 at the detection position. Maximum depth or minimum depth can be measured.

  For example, as in the example shown in FIG. 2, when the minimum depth Bmin of the measurement target W is detected by the second probe 15 first, as can be understood by referring also to FIG. 3, The minimum depth Bmin detected by the two probes 15 and the depth A detected by the first probe 14 at the detection position (the position where the minimum depth Bmin of the measurement target W is detected by the second probe 15) are used. Thus, the maximum depth Bmax of the measuring object W can be measured by the following equation (1).

(Equation 1)

  When the first probe 14 detects the minimum depth of the measurement target W first, or when the first probe 14 or the second probe 15 detects the maximum depth of the measurement target W within the measurement range. However, it goes without saying that the maximum depth or the minimum depth of the measuring object W that is not actually detected can be measured in the same manner.

  As described above, according to the present embodiment, the first probe that is rotatably arranged around the rotation shaft 12 as a detection unit for detecting the depth of the circular measurement target W such as an annular shape or a disk shape. 14 and the second probe 15 are prepared, the first probe 14 and the second probe 15 are rotated 180 degrees around the rotation axis 12, and measurement is performed based on the detection value and the detection position detected by each probe at that time. By measuring the depth of the object W, it is possible to reliably measure the depth of the entire circumference of the circular measurement object W, particularly the minimum depth and the maximum depth. At this time, since it is not necessary to rotate (scan) the first probe 14 and the second probe 15 for the entire circumference (360 degrees), it is possible to effectively reduce the man-hours required for depth measurement.

  In the above embodiment, the two first probes 14 and the second probe 15 are used as the detection unit for detecting the depth of the circular measurement target W. For example, the first probe 14 and the second probe 15 are used. While only one of the probes 15 is used, a rotary encoder is attached to the rotary shaft 12, and one probe is rotated around the rotary shaft 12 to detect the minimum depth or the maximum depth of the measuring object W, and from that position From the detected value detected at the position where the probe is rotated by an arbitrary angle and the amount of change in the angle indicated by the rotary encoder, the maximum depth or the minimum depth of the measuring object W that is not actually detected is measured. It may be.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. These are included in the present invention.

DESCRIPTION OF SYMBOLS 1 ... Measuring apparatus, 10 ... Measuring part, 11 ... Support part, 11a ... Notch of support part, 12 ... Rotating shaft, 13 ... Mounting plate, 14 ... 1st probe (1st detection part), 15 ... 2nd probe (Second detection unit), 20 ... fixing unit, W ... measurement object

Claims (1)

A rotation axis, a first detection unit that is rotatably arranged around the rotation axis, and that detects a depth of a measurement target; a concentric circle with the first detection unit; and a predetermined angular interval from the first detection unit A depth measuring method for measuring the depth of a circular measuring object by a measuring device that is arranged to be rotatable about the rotation axis and includes a second detection unit that detects the depth of the measuring object. ,
A detection value detected by the first detection unit when the first and second detection units are rotated by 180 degrees with respect to the measurement object around the rotation axis, and the second detection unit at the detection position. A depth measurement method for measuring a depth of the measurement object from a detection value detected by the method.

Images