JP2019015704A - Cam profile measurement device - Google Patents

Abstract

To provide a cam profile measurement device that enables simplification of a work for detaching a cam shaft, and enables simplification of a work prior to a cam profile measurement.SOLUTION: The present cam profile measurement device comprises: a revolving mechanism 5 that holds a cam shaft 2, and revolves the cam shaft; a laser type displacement sensor 6 that has a light emission unit emitting laser light toward an outer periphery of a cam 2a, and a light reception unit receiving the laser light emitted from the light emission unit and reflected upon the outer periphery of the cam 2a; and a reference part sensor 7 for detecting a key groove to be formed in the cam shaft 2. A control unit of the cam profile measurement device is configured to: identify a position of the key groove on the basis of a detection result of the reference part sensor 7; while revolving the cam shaft 2 by the revolving mechanism 5 on the basis of the identified position of the key groove, irradiate the cam 2a with the laser light from the light emission unit of the laser type displacement sensor 6; and identify a profile of the cam 2a on the basis of the position of the key groove based on a light reception result at the light reception unit of the laser type displacement sensor 6.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a cam shape measuring device that measures the shape of a cam formed on a cam shaft.

  2. Description of the Related Art Conventionally, a cam profile measuring device that measures the shape of a cam formed on a cam shaft (cam shaft) is known (see, for example, Patent Document 1). The measuring device described in Patent Document 1 includes a spindle and tail that support both ends of a cam shaft, a drive mechanism that rotationally drives the spindle, a linear gauge that contacts the outer peripheral surface of the cam and measures the shape of the cam. It has.

JP 2008-39621 A

  In the measuring apparatus described in Patent Document 1, the camshaft cannot be attached to or removed from the spindle and tail unless the linear gauge is retracted. Further, in this measuring apparatus, after the cam shaft is attached to the spindle and tail, it is necessary to bring the linear gauge into contact with the cam before measuring the shape of the cam. Therefore, in this measuring apparatus, the operation of attaching / detaching the cam shaft to / from the spindle and tail and the operation before measuring the cam shape become complicated.

  Accordingly, an object of the present invention is to simplify a cam shaft attaching / detaching operation in a cam shape measuring apparatus for measuring the shape of a cam formed on a cam shaft, and to simplify an operation before measuring a cam shape. It is an object of the present invention to provide a cam shape measuring apparatus that can perform the above-described operation.

  In order to solve the above problems, a cam shape measuring device according to the present invention is a cam shape measuring device for measuring the shape of a cam formed on a cam shaft. Laser-type displacement having a rotating mechanism for rotating the cam shaft, a light emitting portion for emitting laser light toward the outer peripheral surface of the cam, and a light receiving portion for receiving laser light emitted from the light emitting portion and reflected by the outer peripheral surface of the cam A sensor, a reference part sensor for detecting a reference part of the cam shaft serving as a reference in the circumferential direction of the cam shaft, and a control part of the cam shape measuring device, the control part being based on the detection result of the reference part sensor As a result, the position of the reference portion in the circumferential direction is specified, and the laser beam is emitted from the light emitting portion to the cam while rotating the cam shaft with the rotation mechanism based on the specified reference portion position, and the light receiving result at the light receiving portion Based on And identifies the profile of the cam relative to the position of the reference portion Te.

  In the cam shape measuring apparatus of the present invention, a laser-type displacement having a light emitting portion for emitting laser light toward the outer peripheral surface of the cam and a light receiving portion for receiving laser light emitted from the light emitting portion and reflected by the outer peripheral surface of the cam. Using the sensor, the shape of the cam is measured without contact. Therefore, in the present invention, the camshaft can be attached to and detached from the rotation mechanism without retracting the laser displacement sensor. Therefore, in the present invention, it is possible to simplify the operation of attaching and detaching the cam shaft. Further, in the present invention, since it is not necessary to bring the laser displacement sensor into contact with the cam before measuring the cam shape, the work before measuring the cam shape can be simplified.

  The cam shape measuring device of the present invention includes a reference part sensor for detecting a reference part of the cam shaft that is a reference in the circumferential direction of the cam shaft, and the control part is based on a detection result of the reference part sensor. As a result, the position of the reference portion in the circumferential direction is specified, and the laser beam is emitted from the light emitting portion to the cam while rotating the cam shaft with the rotation mechanism based on the specified reference portion position, and the light receiving result at the light receiving portion The outer shape of the cam based on the position of the reference portion is specified based on the above. Therefore, according to the present invention, it becomes possible to automatically measure the outer shape of the cam based on the position of the reference portion.

  In the present invention, when the predetermined direction orthogonal to the axial direction of the cam shaft held by the rotation mechanism is the first direction, the cam shape measuring device includes a moving mechanism that moves the laser displacement sensor in the first direction, The control unit has a disk part formed in a disk shape, and has the light emitting part centered in the first direction of the adjustment shaft attached to the rotation mechanism so as to rotate about the axis of the disk part. While the laser displacement sensor is moved by the moving mechanism so that the laser beam emitted from the laser beam crosses in the first direction, the laser beam is irradiated from the light emitting unit to the disk unit, and the output peak of the light receiving unit is specified, and the light receiving unit It is preferable to move the laser displacement sensor to a position where the output becomes a peak by a moving mechanism and stop it. With this configuration, it is possible to automatically align the axis of the cam shaft attached to the rotation mechanism and the laser displacement sensor in the first direction. Therefore, the adjustment work of the cam shape measuring device can be simplified.

  In the present invention, the reference portion is a keyway formed in the cam shaft, and the reference portion sensor is emitted from the second light emitting portion that emits laser light toward the outer peripheral surface of the cam shaft and the second light emitting portion. And a second laser type displacement sensor having a second light receiving portion for receiving the laser beam reflected by the outer peripheral surface of the cam shaft. With this configuration, the cam shaft can be attached to and detached from the rotation mechanism without retracting the second laser displacement sensor. Therefore, it is possible to further simplify the cam shaft attaching / detaching operation.

  In the present invention, the control unit, for example, laser light from the second light emitting unit to the cam shaft while rotating the cam shaft by a rotation mechanism so that the laser light emitted from the second light emitting unit crosses the key groove in the circumferential direction. And the positions of the two edges of the keyway in the circumferential direction are specified based on the light reception result of the second light receiving unit. In this case, the center position of the key groove in the circumferential direction can be easily specified using the positions of the two edges of the key groove in the circumferential direction.

  In the present invention, the cam shape measuring device is affixed to a main body frame for holding the laser type displacement sensor so that the laser type displacement sensor can move in the axial direction of the cam shaft held by the rotating mechanism. It is preferable to provide a scale that serves as a guide for the position of the laser displacement sensor in the axial direction. If comprised in this way, even if the position of the cam in an axial direction changes, it becomes possible to move a laser type displacement sensor to an axial direction with respect to a main body frame, and to measure the shape of a cam. Also, with this configuration, it is possible to specify the approximate position of the laser displacement sensor in the axial direction using the scale, so the laser displacement sensor can move in the axial direction with respect to the main body frame. Even in this case, the moving operation of the laser displacement sensor in the axial direction becomes easy.

  In the present invention, the cam shape measuring device includes a main body frame that holds the second laser type displacement sensor so that the second laser type displacement sensor can move in the axial direction of the cam shaft held by the rotation mechanism, It is preferable to include a second scale that is affixed to the main body frame and serves as a guide for the axial position of the second laser displacement sensor. With this configuration, even if the position of the key groove in the axial direction changes, it is possible to detect the position of the key groove by moving the second laser displacement sensor in the axial direction with respect to the main body frame. . Further, with this configuration, it is possible to specify an approximate arrangement position in the axial direction of the second laser displacement sensor using the second scale. Even if the frame is movable in the axial direction, the second laser displacement sensor can be easily moved in the axial direction.

  In the present invention, the cam shape measuring device includes a display unit connected to the control unit, the cam shaft is a forged blank before the cam grinding process is performed, and the control unit includes a cam after the cam grinding process. The reference shape data, which is the shape data of the outer shape, is stored in advance, and the control unit generates measurement shape data, which is the shape data of the outer shape of the cam specified based on the light reception result at the light receiving unit, and The position corresponding to the axis of the camshaft and the position corresponding to the axis of the camshaft on the measurement shape data overlap, and the position corresponding to the reference portion on the reference shape data and the measurement shape It is preferable that the reference shape data and the measured shape data are displayed on the display unit so that the position corresponding to the reference portion on the data overlaps.

  If comprised in this way, it will become possible to visually confirm the grinding allowance of a cam over the whole region of the circumferential direction of a cam. Therefore, the cam grinding allowance can be easily grasped. Also, with this configuration, since the data stored in the control unit is not numerical data but shape data, the capacity of data stored in the control unit can be reduced. Furthermore, if comprised in this way, since reference | standard shape data is previously memorize | stored in the control part, it will become possible to shorten the measurement time of a cam shape.

  In the present invention, the control unit calculates the minimum value of the grinding allowance of the cam on the measured shape data based on the reference shape data and the measured shape data displayed on the display unit, and the minimum value of the grinding allowance is predetermined. If it is less than the value, rotate the measurement shape data around the position corresponding to the axis of the camshaft on the measurement shape data so that the minimum grinding allowance is not less than the predetermined value. It is preferable to calculate the rotation amount. With this configuration, for example, when the reference portion is a key groove, the cam groove is actually machined into the cam shaft position where the cam grinding allowance exceeds a predetermined value over the entire circumferential direction of the cam. It is possible to calculate the amount of deviation from the position of the keyway that is present as the amount of rotation. That is, it is possible to calculate a correction value for the key groove machining position such that the cam grinding allowance is equal to or greater than a predetermined value over the entire circumferential direction of the cam. Therefore, for example, after the correction value is calculated, the camshaft in which the keyway is not machined is processed with the keyway based on the correction value, so that the cam can be moved over the entire circumferential direction of the cam. It is possible to process the keyway at a position where the grinding allowance is equal to or greater than a predetermined value.

  In the present invention, the control unit, for example, irradiates the post-grinding cam with laser light while rotating a reference cam shaft having a post-grinding cam, which is a cam after grinding, by a rotating mechanism, and receives light at the light receiving unit. Based on the result, the external shape of the cam after grinding with reference to the position of the reference portion is specified to generate reference shape data, and the reference shape data is stored. In this case, if there are a plurality of types of cam shafts whose cam shapes are measured by the cam shape measuring device, the control unit generates reference shape data corresponding to each of the plurality of types of cam shafts, Reference shape data is stored in advance.

  As described above, according to the present invention, in the cam shape measuring device for measuring the shape of the cam formed on the cam shaft, the cam shaft attaching / detaching operation is simplified, and the operation before the cam shape measurement is simplified. It becomes possible to do.

It is a front view of the cam shape measuring apparatus concerning an embodiment of the invention. It is a top view which shows the principal part of a cam shape measuring apparatus from the EE direction of FIG. It is a right view which shows the principal part of a cam shape measuring apparatus from the FF direction of FIG. It is a figure of the cam shaft shown in FIG. It is a block diagram of a part of structure of the cam shape measuring apparatus shown in FIG. It is a figure for demonstrating the principle of the automatic positioning method of the 1st direction of the laser type displacement sensor shown in FIG. It is a figure for demonstrating the detection method of the keyway by the 2nd laser type displacement sensor shown in FIG. It is a figure for demonstrating the content displayed on the display part shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Schematic configuration of cam shape measurement)
FIG. 1 is a front view of a cam shape measuring apparatus 1 according to an embodiment of the present invention. FIG. 2 is a plan view showing the main part of the cam shape measuring apparatus 1 from the EE direction of FIG. FIG. 3 is a right side view showing the main part of the cam shape measuring apparatus 1 from the FF direction of FIG. FIG. 4 is a diagram of the camshaft 2 shown in FIG. FIG. 5 is a block diagram of a part of the configuration of the cam shape measuring apparatus 1 shown in FIG.

  The cam shape measuring apparatus 1 (hereinafter referred to as “measuring apparatus 1”) of this embodiment is an apparatus for measuring a cam 2a formed on a cam shaft (camshaft) 2. For example, as shown in FIG. 4, four cams 2 a are formed on the cam shaft 2. In the measuring apparatus 1, the shape of one cam 2a out of the four cams 2a is measured. Further, a key groove 2 b serving as a reference in the circumferential direction of the cam shaft 2 is formed in the shaft portion of the cam shaft 2. The keyway 2b of this embodiment is a reference portion of the camshaft 2 that serves as a reference in the circumferential direction of the camshaft 2. Further, the cam shaft 2 of this embodiment is a forged blank before the cam 2a is ground, and the cam 2a is ground in a subsequent process. The keyway 2b is formed by a keyway processing device before the shape of the cam 2a is measured by the measuring device 1.

  The measuring device 1 includes a rotating mechanism 5 that holds the cam shaft 2 and rotates the cam shaft 2 around the axis of the cam shaft 2, a laser displacement sensor 6 for measuring the shape of the cam 2a, a key A laser displacement sensor 7 for detecting the groove 2b and a cam shaft sensor 8 for detecting that the cam shaft 2 is attached to the rotating mechanism 5 are provided. The laser displacement sensor 7 of the present embodiment is a reference portion sensor for detecting the key groove 2b that is a reference portion of the camshaft 2, and is a second laser displacement sensor. In addition, illustration of the rotation mechanism 5 is abbreviate | omitted in FIG.

  The cam shaft 2 is held by the rotation mechanism 5 so that the axial direction of the cam shaft 2 is parallel to the horizontal direction. Further, the cam shaft 2 is held by the rotation mechanism 5 so that the axial direction of the cam shaft 2 and the left-right direction of the measuring apparatus 1 (the Y direction in FIG. 1 and the like) coincide. That is, the left-right direction (Y direction) is the axial direction of the cam shaft 2 held by the rotation mechanism 5, and the cam shaft 2 rotates with the left-right direction as the axis direction of rotation. The vertical direction (vertical direction, Z direction in FIG. 1, etc.) of this embodiment is a first direction orthogonal to the axial direction of the cam shaft 2. In the following description, the right direction in FIG. 1 is referred to as “right direction”, and the left direction in FIG. 1 is referred to as “left direction”. Note that the X1 direction side in FIG. 2 etc. in the front-back direction (X direction) of the measuring device 1 is the front side of the measuring device 1, and the opposite X2 direction side in FIG. It is the back (back) side.

  The measuring apparatus 1 includes a touch panel 9 for performing various operations of the measuring apparatus 1, a display unit 10 for performing various displays, a control unit 11 of the measuring apparatus 1 for controlling the measuring apparatus 1, and a rotation mechanism. 5 and a main body frame 16 of the measuring apparatus 1 are provided. The touch panel 9 and the display unit 10 are disposed on the upper end portion of the measuring device 1. The display unit 10 of this embodiment is a liquid crystal display. The touch panel 9 and the display unit 10 are connected to the control unit 11. The upper surface of the main body frame 16 is a plane orthogonal to the vertical direction. The attachment frame 15 is fixed to the upper surface of the main body frame 16. The upper surface of the mounting frame 15 is a plane orthogonal to the vertical direction. The rotation mechanism 5 is attached to the upper surface of the attachment frame 15.

  The rotating mechanism 5 includes a spindle stock 17 that holds the left end of the cam shaft 2 and a tailstock 18 that holds the right end of the cam shaft 2. The headstock 17 is fixed to the mounting frame 15. A motor 19 as a drive source for rotating the camshaft 2 is connected to the headstock 17. The motor 19 of this embodiment is a stepping motor. The tailstock 18 is attached to the attachment frame 15 so as to be movable in the left-right direction. The operator manually moves the tailstock 18 in the left-right direction according to the length of the camshaft 2, and then fixes the tailstock 18 to the mounting frame 15. On the upper surface of the mounting frame 15, a scale 20 is attached as a guide for the position of the tailstock 18 in the left-right direction. The scale 20 is a metal scale plate formed linearly.

(Configuration of laser displacement sensor, camshaft sensor and its peripheral parts)
FIG. 6 is a diagram for explaining the principle of the automatic positioning method in the vertical direction of the laser displacement sensor 6 shown in FIG. FIG. 7 is a view for explaining a method of detecting the key groove 2b by the laser type displacement sensor 7 shown in FIG.

  The laser displacement sensor 6 is a reflection type laser displacement sensor, which emits laser light toward the outer peripheral surface of the cam 2a, and is emitted from the light emitting portion 6a and reflected by the outer peripheral surface of the cam 2a. And a light receiving portion 6b for receiving laser light (see FIG. 4). In the laser displacement sensor 6, when the distance between the position of the outer peripheral surface of the cam 2a irradiated with the light emitted from the light emitting portion 6a and the laser displacement sensor 6 varies, the output of the light receiving portion 6b varies. The control unit 11 irradiates the cam 2 with the laser light while rotating the cam shaft 2 by the rotation mechanism 5, and specifies the outer shape of the cam 2a based on the light reception result of the light receiving unit 6b.

  The laser displacement sensor 6 is disposed on the rear side of the cam shaft 2 held by the rotation mechanism 5, and the light emitting unit 6a irradiates the cam 2a with laser light from the rear side. Further, the laser displacement sensor 6 is arranged behind the mounting frame 15. The laser displacement sensor 6 is held by a YZθ table 23, and the rotation of the laser displacement sensor 6 with the vertical direction as the axial direction of the rotation and the movement of the laser displacement sensor 6 in the horizontal direction and the vertical direction. Is possible. A motor 25 that rotates the feed screw 24 is connected to the feed screw 24 (see FIG. 3) in the vertical direction of the YZθ table 23. The motor 25 is, for example, a stepping motor. In this embodiment, a moving mechanism 26 that moves the laser displacement sensor 6 in the vertical direction is configured by the feed screw 24, the motor 25, and the like.

  In this embodiment, the laser displacement sensor 6 is automatically positioned in the vertical direction before the shape of the cam 2a is measured. Specifically, first, an adjustment shaft 52 (see FIG. 6A) having a disk portion 52 a formed in a disk shape is attached to the rotation mechanism 5. The axis of the disc portion 52a coincides with the axis of the adjustment shaft 52, and the adjustment shaft 52 is attached to the rotation mechanism 5 so as to rotate about the axis of the disc portion 52a. Thereafter, the control unit 11 moves the laser displacement sensor 6 by the moving mechanism 26 so that the laser beam emitted from the light emitting unit 6a of the laser displacement sensor 6 crosses the vertical center of the adjustment shaft 52 in the vertical direction. However (see FIG. 6A), the laser beam is irradiated from the light emitting portion 6a to the disc portion 52a.

  When the disk portion 52a is irradiated with laser light while moving the laser displacement sensor 6 in this way, the output of the light receiving portion 6b of the laser displacement sensor 6 varies as shown in FIG. 6B. Specifically, when the optical axis of the light emitting unit 6a is arranged at the same height as the vertical center of the adjusting shaft 52 (that is, the axis of the adjusting shaft 52), the output of the light receiving unit 6b peaks. Thus, the output of the light receiving unit 6b varies. The control unit 11 specifies the peak of the output of the light receiving unit 6b. Moreover, the control part 11 moves the laser displacement sensor 6 to the position (height) where the output of the light-receiving part 6b peaks, and stops it.

  When the laser displacement sensor 6 stops, the laser displacement sensor 6 is disposed at a position where the height of the optical axis of the light emitting portion 6a coincides with the height of the axis of the adjustment shaft 52. That is, the laser displacement sensor 6 is disposed at a position where the height of the axis of the cam shaft 2 attached to the rotating mechanism 5 coincides with the height of the optical axis of the light emitting portion 6a when the shape of the cam 2a is measured. . The rotation of the laser displacement sensor 6 using the YZθ table 23 and the movement of the laser displacement sensor 6 in the left-right direction are performed manually.

  The YZθ table 23 is fixed to the moving frame 27. The moving frame 27 is attached to the main body frame 16 so as to be movable in the left-right direction. The YZθ table 23 and the moving frame 27 are arranged behind the mounting frame 15. A guide rail 28 that guides the moving frame 27 in the left-right direction is fixed to the upper surface of the main body frame 16, and a guide block 29 that engages with the guide rail 28 is fixed to the lower surface of the moving frame 27. The moving frame 27 is provided with a fixing mechanism for fixing the moving frame 27. In this embodiment, the moving frame 27 is manually moved in the left-right direction.

  Thus, the main body frame 16 holds the laser displacement sensor 6 via the YZθ table 23 and the moving frame 27 so that the laser displacement sensor 6 can move in the left-right direction. On the upper surface of the main body frame 16, a scale 30 that serves as a guide for the position of the moving frame 27 in the left-right direction is attached. That is, the scale 30 that serves as a guide for the position of the laser displacement sensor 6 in the left-right direction is attached to the upper surface of the main body frame 16. The scale 30 is a metal scale plate formed in a straight line, and is disposed along the guide rail 28.

  Similarly to the laser displacement sensor 6, the laser displacement sensor 7 is a reflective laser displacement sensor, and is directed toward the outer peripheral surface of the cam shaft 2 (specifically, the outer peripheral surface of the shaft portion of the cam shaft 2). A light emitting part 7a for emitting laser light and a light receiving part 7b for receiving the laser light emitted from the light emitting part 7a and reflected by the cam shaft 2 (see FIG. 7). In the laser displacement sensor 7, when the distance between the laser shaft displacement sensor 7 and the position of the camshaft 2 irradiated with the light emitted from the light emitting portion 7a varies, the output of the light receiving portion 7b varies.

  The control unit 11 emits laser light from the light emitting unit 7a to the cam shaft 2 while rotating the cam shaft 2 by the rotation mechanism 5 so that the laser light emitted from the light emitting unit 7a crosses the key groove 2b in the circumferential direction of the cam shaft 2. While irradiating, the positions of the two edges of the key groove 2b in the circumferential direction of the cam shaft 2 are specified based on the light reception result at the light receiving portion 7b (see FIG. 7). Further, the control unit 11 specifies the center position of the key groove 2 b in the circumferential direction of the cam shaft 2 using the positions of the two edges of the key groove 2 b in the circumferential direction of the cam shaft 2.

  The laser displacement sensor 7 is disposed on the front side of the cam shaft 2 held by the rotation mechanism 5, and the light emitting unit 7a irradiates the cam shaft 2 with laser light from the front side. The laser displacement sensor 7 is disposed on the front side of the mounting frame 15. The laser-type displacement sensor 7 is held by an XYZθ table 33. The laser-type displacement sensor 7 rotates in the vertical direction and the laser-type displacement sensor in the front-rear direction, the left-right direction, and the vertical direction. 7 movements are possible. The rotation of the laser displacement sensor 7 using the XYZθ table 33 and the movement of the laser displacement sensor 6 in the front-rear direction, the left-right direction, and the up-down direction are performed manually. The positioning of the laser displacement sensor 7 is manually performed using an adjustment gauge.

  The XYZθ table 33 is fixed to the moving frame 34. The moving frame 34 is attached to the main body frame 16 so as to be movable in the left-right direction. The XYZθ table 33 and the moving frame 34 are disposed on the front side of the mounting frame 15. A guide rail 35 that guides the moving frame 34 in the left-right direction is fixed to the upper surface of the main body frame 16, and a guide block 36 that engages with the guide rail 35 is fixed to the lower surface of the moving frame 34. The moving frame 34 is provided with a fixing mechanism for fixing the moving frame 34. In this embodiment, the moving frame 34 is manually moved in the left-right direction.

  Thus, the main body frame 16 holds the laser displacement sensor 7 via the XYZθ table 33 and the moving frame 34 so that the laser displacement sensor 7 can move in the left-right direction. On the upper surface of the main body frame 16, a scale 37 that serves as a guide for the position of the moving frame 34 in the left-right direction is attached. That is, a scale 37 serving as a guide for the position of the laser displacement sensor 7 in the left-right direction is attached to the upper surface of the main body frame 16. The scale 37 is a metal scale plate formed in a straight line, and is disposed along the guide rail 35.

  The cam shaft sensor 8 is a reflective optical sensor having a light emitting part and a light receiving part. The cam shaft sensor 8 is disposed in front of the cam shaft 2 held by the rotation mechanism 5. The camshaft sensor 8 is arranged so that the light emitting surface of the light emitting unit and the light receiving surface of the light receiving unit face the rear side. On the rear side of the camshaft 2, a reflection mirror 40 is disposed so as to face the camshaft sensor 8 in the front-rear direction.

(Cam shape measuring device control method)
FIG. 8 is a diagram for explaining the contents displayed on the display unit 10 shown in FIG.

  In the measuring apparatus 1, when the cam shaft 2 is attached to the rotation mechanism 5 in order to measure the shape of the cam 2 a, the control unit 11 causes the cam shaft sensor 8 to attach the cam shaft 2 to the rotation mechanism 5. It is detected whether or not. When it is detected that the cam shaft 2 is attached to the rotation mechanism 5, the control unit 11 starts from the light emitting unit 7 a of the laser displacement sensor 7 while rotating the cam shaft 2 by the rotation mechanism 5 as described above. The cam shaft 2 is irradiated with laser light, and the positions of the two edges of the key groove 2b in the circumferential direction of the cam shaft 2 are specified based on the light reception result of the light receiving portion 7b of the laser displacement sensor 7, and the cam The center position of the keyway 2b in the circumferential direction of the shaft 2 is specified. That is, the control unit 11 specifies the position of the key groove 2 b in the circumferential direction of the cam shaft 2 based on the detection result of the laser displacement sensor 7.

  Thereafter, the control unit 11 irradiates the cam 2 with laser light from the light emitting unit 6a of the laser displacement sensor 6 while rotating the cam shaft 2 by the rotation mechanism 5 with reference to the position of the specified key groove 2b. Based on the light reception result of the light receiving portion 6b of the laser displacement sensor 6, the outer shape of the cam 2a is specified based on the position of the key groove 2b (that is, based on the phase of the key groove 2b). That is, the control unit 11 calculates the outer diameter of the cam 2a over the entire 360 ° region in the circumferential direction of the cam shaft 2 with the center position of the key groove 2b in the circumferential direction of the cam shaft 2 as the origin. Specify the outer shape of. Further, the control unit 11 generates measurement shape data SD2 (see FIG. 8), which is shape data (graphic data) of the outer shape of the cam 2a specified based on the light reception result at the light receiving unit 6b.

  Here, as described above, the camshaft 2 of the present embodiment is a forged blank before the cam 2a is ground. In the measuring apparatus 1, a reference cam shaft having a post-grinding cam that is a cam after grinding is attached to the rotation mechanism 5 before the shape of the cam 2 a is measured. The control unit 11 specifies the position of the key groove 2 b in the circumferential direction of the reference cam shaft based on the detection result of the laser displacement sensor 7 while rotating the reference cam shaft by the rotation mechanism 5. Further, the control unit 11 irradiates the cam after grinding from the light emitting unit 6a with the laser beam from the light emitting unit 6a while rotating the reference cam shaft by the rotation mechanism 5 with reference to the position of the specified key groove 2b, and receives the light at the light receiving unit 6b. Based on the result, the outer shape of the post-grinding cam is specified based on the position of the keyway 2b. Further, the control unit 11 generates and stores reference shape data SD1 (see FIG. 8) that is shape data of the outer shape of the post-grinding cam specified based on the light reception result at the light receiving unit 6b.

  That is, the control unit 11 stores in advance the reference shape data SD1 that is the shape data of the outer shape of the cam 2a after grinding. In this embodiment, since the shapes of the cams 2a of the plurality of types of cam shafts 2 are measured by the measuring device 1, the outer shapes of the respective cams after grinding of the plurality of types of reference cam shafts are determined using the plurality of types of reference cam shafts. Identified. In addition, the control unit 11 generates reference shape data SD1 corresponding to each of a plurality of types of cam shafts 2, and stores the generated plurality of reference shape data SD1 in advance.

  When the control unit 11 generates the measurement shape data SD2, as shown in FIG. 8A, the position corresponding to the axis of the cam shaft (reference cam shaft) on the reference shape data SD1 and the measurement shape data SD2 And a position corresponding to the key groove 2b on the reference shape data SD1 and a position corresponding to the key groove 2b on the measurement shape data SD2 so that the position corresponding to the axis of the cam shaft 2 overlaps. (Ie, the origin position in the circumferential direction of the contour of the cam after grinding on the reference shape data SD1 and the origin position in the circumferential direction of the contour of the cam 2a on the measurement shape data SD2 coincide with each other) ), The reference shape data SD1 and the measurement shape data SD2 are displayed on the display unit 10.

  Thereafter, the control unit 11 calculates the minimum grinding allowance of the cam 2a on the measurement shape data SD2 based on the reference shape data SD1 and the measurement shape data SD2 displayed on the display unit 10. In the example shown in FIG. 8A, since the grinding allowance of the cam 2a at the portion indicated by the arrow V is the minimum value, the control unit 11 calculates the grinding allowance at this portion. In addition, when the calculated grinding allowance of the cam 2a is less than a predetermined value, the control unit 11 sets the cam shaft on the measured shape data SD2 so that the minimum value of the grinding allowance of the cam 2a is equal to or greater than the predetermined value. The measurement shape data SD2 is rotated around the position corresponding to the axis 2 (see FIG. 8B). For example, the control unit 11 rotates the measurement shape data SD2 in the clockwise direction at a pitch of 1.6 °.

  Moreover, the control part 11 calculates the rotation amount. The calculated amount of rotation includes the position of the key groove 2b where the grinding allowance of the cam 2a becomes a predetermined value or more over the entire circumferential direction of the cam 2a, and the position of the key groove 2b actually processed in the cam shaft 2. The amount of deviation. The calculated amount of rotation is fed back to a keyway machining apparatus for machining the keyway 2b as a correction value for the machining position of the keyway 2b with respect to the camshaft 2. In the keyway processing device, the camshaft 2 is processed with the keyway 2b based on this correction value. For this reason, in the cam shaft 2 in which the key groove 2b is processed by the key groove processing apparatus after the correction value is fed back, the cam 2a has a grinding allowance at a position equal to or greater than a predetermined value over the entire circumferential direction of the cam 2a. The keyway 2b is processed.

(Main effects of this form)
As described above, in the present embodiment, the shape of the cam 2 a is measured using the laser displacement sensor 6 disposed on the rear side of the mounting frame 15. Therefore, in this embodiment, the cam shaft 2 can be attached to and detached from the rotating mechanism 5 without retracting the laser displacement sensor 6. Therefore, in this embodiment, it is possible to simplify the attaching / detaching operation of the cam shaft 2. Further, in this embodiment, since the key groove 2b is detected using the laser displacement sensor 7 disposed on the front side of the mounting frame 15, the rotation mechanism 5 can be connected to the rotating mechanism 5 without retracting the laser displacement sensor 7. On the other hand, the cam shaft 2 can be attached and detached. Therefore, in this embodiment, it is possible to further simplify the attaching / detaching operation of the cam shaft 2. Further, in this embodiment, since it is not necessary to bring the laser type displacement sensor 6 into contact with the cam 2a before measuring the shape of the cam 2a, the work before measuring the shape of the cam 2a can be simplified.

  In the present embodiment, the control unit 11 specifies the position of the key groove 2b in the circumferential direction of the cam shaft 2 based on the detection result of the laser displacement sensor 7, and rotates based on the position of the specified key groove 2b. While the cam shaft 2 is rotated by the mechanism 5, the laser light is irradiated from the light emitting portion 6a of the laser displacement sensor 6 to the cam 2, and the position of the key groove 2b is determined based on the light reception result of the light receiving portion 6b of the laser displacement sensor 6. The outer shape of the cam 2a based on the above is specified. Therefore, in this embodiment, it becomes possible to automatically measure the outer shape of the cam 2a with reference to the position of the keyway 2b.

  In this embodiment, the control unit 11 emits light while moving the laser displacement sensor 6 by the moving mechanism 26 so that the light emitting unit 6a crosses the center of the adjustment shaft 52 attached to the rotating mechanism 5 in the vertical direction. The disk portion 52a is irradiated with laser light from the portion 6a, the peak of the output of the light receiving portion 6b is specified, and the laser displacement sensor 6 is moved by the moving mechanism 26 to a height at which the output of the light receiving portion 6b reaches the peak. Stopped. That is, in this embodiment, the laser displacement sensor 6 is automatically moved to a position where the height of the axis of the cam shaft 2 and the height of the optical axis of the light emitting portion 6a coincide. Therefore, in this embodiment, it is possible to simplify the adjustment work of the measuring device 1 before measuring the cam 2a with the measuring device 1.

  In this embodiment, the laser displacement sensor 6 is movable in the left-right direction with respect to the main body frame 16. Therefore, in this embodiment, even if the position of the cam 2a in the left-right direction changes, the shape of the cam 2a can be measured by moving the laser displacement sensor 6 in the left-right direction with respect to the main body frame 16. In this embodiment, since the laser displacement sensor 7 can move in the left-right direction with respect to the main body frame 16, even if the position of the key groove 2b in the left-right direction changes, The position of the key groove 2b can be detected by moving the laser displacement sensor 7 in the direction.

  In this embodiment, a scale 30 that serves as a guide for the position of the laser displacement sensor 6 in the left-right direction and a scale 37 that serves as a guide for the position of the laser displacement sensor 7 in the left-right direction are attached to the upper surface of the main body frame 16. Therefore, it is possible to specify the approximate arrangement position of the laser displacement sensor 6 in the left-right direction using the scale 30, and approximately the position of the laser displacement sensor 7 in the left-right direction using the scale 37. It becomes possible to specify the arrangement position. Therefore, in this embodiment, even if the laser displacement sensors 6 and 7 are movable in the left-right direction with respect to the main body frame 16, the operation of moving the laser displacement sensors 6, 7 in the left-right direction is facilitated.

  In this embodiment, the control unit 11 stores reference shape data SD1 that is shape data of the outer shape after grinding of the cam 2a. Therefore, in this embodiment, it is possible to reduce the capacity of data stored in the control unit 11 as compared with the case where the data stored in the control unit 11 is numerical data. Further, in this embodiment, since the reference shape data SD1 is stored in the control unit 11 in advance, it is possible to shorten the measurement time of the shape of the cam 2a.

  In the present embodiment, the control unit 11 causes the position corresponding to the axis of the reference cam shaft on the reference shape data SD1 and the position corresponding to the axis of the cam shaft 2 on the measurement shape data SD2 to overlap. In addition, the reference shape data SD1 and the measurement shape data SD2 are displayed on the display unit so that the position corresponding to the key groove 2b on the reference shape data SD1 and the position corresponding to the key groove 2b on the measurement shape data SD2 overlap. 10 is displayed. Therefore, in this embodiment, the grinding allowance of the cam 2a can be visually confirmed over the entire circumferential direction of the cam 2a. Therefore, in this embodiment, the grinding allowance of the cam 2a can be easily grasped.

  In this embodiment, the control unit 11 calculates the minimum grinding allowance of the cam 2a on the measurement shape data SD2 based on the reference shape data SD1 and the measurement shape data SD2 displayed on the display unit 10, and calculates If the grinding allowance of the cam 2a is less than a predetermined value, the position corresponding to the axis of the cam shaft 2 on the measured shape data SD2 so that the minimum grinding allowance of the cam 2a is equal to or greater than the predetermined value. The measured shape data SD2 is rotated around the center and the amount of rotation is calculated. Therefore, in this embodiment, the position of the key groove 2b where the grinding allowance of the cam 2a is equal to or greater than a predetermined value over the entire region in the circumferential direction of the cam 2a, and the position of the key groove 2b actually processed in the cam shaft 2 It is possible to calculate the amount of deviation as the amount of rotation. Therefore, in the present embodiment, as described above, the calculated rotation amount is fed back to the keyway machining apparatus as a correction value for the machining position of the keyway 2b with respect to the camshaft 2, so that the cam 2a can be fed to the entire area in the circumferential direction. The key groove 2b can be machined by the key groove machining device at a position where the grinding allowance of the cam 2a becomes a predetermined value or more. As a result, in this embodiment, it becomes possible to prevent the grinding allowance of the cam 2a from becoming small or the grinding allowance of the cam 2a from being lost.

(Other embodiments)
In the embodiment described above, the reference portion of the cam shaft 2 that serves as a reference in the circumferential direction of the cam shaft 2 is the key groove 2b, but the reference portion of the cam shaft 2 is formed on the outer peripheral surface of the shaft portion of the cam shaft 2, for example. It may be a concave or convex portion, or a flat D-cut surface formed on the outer peripheral surface of the shaft portion of the cam shaft 2. The reference portion of the cam shaft 2 may be, for example, a flat plate member that is fitted into the key groove 2b, or a predetermined mark (attachment) that is fixed or attached to the outer peripheral surface of the shaft portion of the cam shaft 2. It may be. In the above-described embodiment, the reference part sensor for detecting the key groove 2b which is the reference part of the cam shaft 2 is the laser displacement sensor 7, but the reference part sensor is an aspect of the reference part of the cam shaft 2. For example, a contact displacement sensor or the like may be used.

  In the embodiment described above, the laser displacement sensor 6 may be manually moved to a position where the height of the axis of the cam shaft 2 and the height of the optical axis of the light emitting portion 6a coincide. In this case, for example, by using an adjustment gauge, the laser displacement sensor 6 is moved to a position where the height of the axis of the cam shaft 2 and the height of the optical axis of the light emitting portion 6a coincide. In this case, the motor 25 is not necessary. In the embodiment described above, the control unit 11 does not have to calculate the minimum grinding allowance of the cam 2a on the measurement shape data SD2, and the minimum grinding allowance of the cam 2a is equal to or greater than a predetermined value. It is not necessary to rotate the measurement shape data SD2. In the embodiment described above, the measurement shape data SD2 may not be displayed on the display unit 10. In this case, the reference shape data SD1 is also not displayed on the display unit 10.

  In the embodiment described above, the laser displacement sensors 6 and 7 may not be movable in the left-right direction. In the above-described embodiment, the measuring apparatus 1 may not include the scales 20, 30, and 37. Moreover, although the up-down direction is the 1st direction in the form mentioned above, the arbitrary directions orthogonal to the left-right direction may be the 1st direction.

1 Measuring device (cam shape measuring device)
2 Cam shaft 2a Cam 2b Keyway (reference part)
DESCRIPTION OF SYMBOLS 5 Rotating mechanism 6 Laser type displacement sensor 6a Light emission part 6b Light receiving part 7 Laser type displacement sensor (2nd laser type displacement sensor, reference | standard part sensor)
7a Light emitting part (second light emitting part)
7b Light receiver (second light receiver)
DESCRIPTION OF SYMBOLS 10 Display part 11 Control part 16 Main body frame 26 Movement mechanism 30 Scale 37 Scale (2nd scale)
52 Adjustment shaft 52a Disk part SD1 Reference shape data SD2 Measurement shape data Y Cam shaft axial direction Z First direction

Claims (9)

In the cam shape measuring device for measuring the shape of the cam formed on the cam shaft,
A rotating mechanism that holds the cam shaft and rotates the cam shaft around the axis of the cam shaft, a light emitting portion that emits laser light toward the outer peripheral surface of the cam, and the light emitted from the light emitting portion. A laser-type displacement sensor having a light receiving portion that receives a laser beam reflected by the outer peripheral surface of the cam; a reference portion sensor for detecting a reference portion of the cam shaft that serves as a reference in the circumferential direction of the cam shaft; A control unit of the cam shape measuring device,
The control unit specifies a position of the reference unit in the circumferential direction based on a detection result of the reference unit sensor, and rotates the camshaft by the rotation mechanism based on the specified position of the reference unit. The cam shape measuring device is characterized by irradiating the cam with a laser beam from the light emitting unit, and specifying an outer shape of the cam based on a position of the reference unit based on a light reception result of the light receiving unit. . When a predetermined direction orthogonal to the axial direction of the cam shaft held by the rotating mechanism is a first direction, the moving mechanism moves the laser displacement sensor in the first direction,
The control unit includes a disk part formed in a disk shape and a center in the first direction of an adjustment shaft attached to the rotation mechanism so as to rotate about the axis of the disk part. Irradiating the disc part with the laser light from the light emitting part while moving the laser displacement sensor by the moving mechanism so that the laser light emitted by the light emitting part crosses in the first direction 2. The cam shape measurement according to claim 1, wherein a peak of the output of the light source is specified and the laser displacement sensor is moved by the moving mechanism to a position where the output of the light receiving part becomes the peak. apparatus. The reference portion is a keyway formed in the camshaft;
The reference portion sensor receives a second light emitting portion that emits laser light toward the outer peripheral surface of the cam shaft and a laser light that is emitted from the second light emitting portion and reflected by the outer peripheral surface of the cam shaft. 3. The cam shape measuring device according to claim 1, wherein the cam shape measuring device is a second laser displacement sensor having a second light receiving portion.   The control unit is configured to rotate the cam shaft from the second light emitting unit to the cam shaft while rotating the cam shaft by the rotating mechanism so that the laser light emitted from the second light emitting unit crosses the key groove in the circumferential direction. 4. The cam shape measuring apparatus according to claim 3, wherein the position of two edges of the key groove in the circumferential direction is specified based on a result of light reception by the second light receiving unit. .   A main body frame that holds the laser type displacement sensor so that the laser type displacement sensor can move in the axial direction of the cam shaft held by the rotation mechanism, and the laser type displacement sensor that is attached to the main body frame. The cam shape measuring device according to any one of claims 1 to 4, further comprising a scale serving as a guide for the position in the axial direction.   A main body frame for holding the second laser type displacement sensor so that the second laser type displacement sensor can move in the axial direction of the cam shaft held by the rotating mechanism, and affixed to the main body frame 5. The cam shape measuring apparatus according to claim 3, further comprising: a second scale serving as a guide for the axial position of the second laser displacement sensor. A display unit connected to the control unit;
The cam shaft is a forged blank before the cam is ground,
In the control unit, reference shape data which is shape data of the outer shape after grinding of the cam is stored in advance.
The control unit generates measurement shape data that is shape data of the outer shape of the cam specified based on a light reception result in the light receiving unit, and corresponds to an axis of the cam shaft on the reference shape data The position corresponding to the axis of the cam shaft on the measurement shape data and the position corresponding to the reference portion on the reference shape data and the measurement shape data, The cam shape measuring device according to any one of claims 1 to 6, wherein the reference shape data and the measured shape data are displayed on the display portion so that a position corresponding to the reference portion overlaps. .   The control unit calculates a minimum value of the grinding allowance of the cam on the measurement shape data based on the reference shape data and the measurement shape data displayed on the display unit, and the minimum grinding allowance When the value is less than a predetermined value, the measurement shape is centered on a position corresponding to the axis of the camshaft on the measurement shape data so that the minimum value of the grinding allowance is not less than the predetermined value. 8. The cam shape measuring apparatus according to claim 7, wherein the rotation amount of the data is calculated and the amount of rotation is calculated.   The control unit irradiates the post-grinding cam with laser light from the light emitting unit while rotating a reference cam shaft having a post-grinding cam, which is the cam after grinding, by the rotating mechanism, and receives light at the light receiving unit. 9. The reference shape data is generated by specifying an outer shape of the post-grinding cam based on the position of the reference portion based on a result, and the reference shape data is stored. Cam shape measuring device.

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