JP2004025379A - Device for measuring angle of grinding wheel of groove cutting machine for compressor cylinder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grinding wheel angle measuring device capable of promptly and accurately measuring an angle of a grinding wheel of a groove cutting machine. <P>SOLUTION: The groove cutting machine is provided with a wheel disc 20 which moves in a rotation axis direction and a direction orthogonal to the rotation axis direction, and a work holding tool 36 fixed on a table 2. A work having an inner bore and a linear groove is held by the work holding tool 36. The work is located and fixed on the work holding tool 36 by locating pins 48, 49, a clamp arm 51 or the like, and the linear groove is cut by the wheel disc 20. The grinding wheel angle measuring device 58 holds a plurality of displacement sensors 65 on a sensor holding stand 62 fixed on the work holding tool 36 with the locating pins 48, 49, the clamp arm 51 or the like. A measuring reference position of each displacement sensor 65 is coordinated with the measuring reference position set in the rotation axis direction to an end face of the wheel disc 20 with intervals. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a grindstone angle measuring device of a groove grinder for grinding a work having an inner hole and a linear vane groove extending radially outward from the inner hole, such as a compressor cylinder.
[0002]
[Prior art]
At present, as this kind of groove grinder, there is used a grindstone disc provided with a grindstone disc capable of moving up and down and moving in the direction of the axis of the grindstone rotating shaft. By moving in the axial direction, both end surfaces in the width direction of the groove of the work are ground.
[0003]
[Problems to be solved by the invention]
In such a groove grinding operation, the perpendicularity of the grinding wheel disk to the lower end mounting surface (finished surface) of the work held by the work holding jig greatly affects the grinding accuracy. It is necessary to precisely fine-tune the squareness of the disc. That is, the operation will be briefly described with reference to FIG. 3. The work W is positioned and fixed on the upper end mounting surface of the work holding jig 36, and the linear groove 43 formed in the work W is ground by the grinding wheel disc 20. However, when the grinding wheel disk is replaced, it is necessary to finely adjust the angle θ of the grinding wheel disk 20 to the upper end mounting surface of the work holding jig 36 at a right angle.
[0004]
However, conventionally, the grinding wheel angle adjustment work as described above, for example, performing a test grinding using a test work, adjusting the grinding wheel angle θ while checking the grinding accuracy of the test grinding one by one, and requires skill and It takes time and effort.
[0005]
[Object of the invention]
An object of the present invention is to make it possible to quickly and accurately adjust the angle of a grinding wheel disc without performing test grinding with a test work or the like.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 of the present application is provided with a grindstone disc so as to be movable in a rotation axis direction and a direction perpendicular to the rotation axis direction, and a work holding jig is provided on a work supply table. Fixing and holding the work having an inner hole and a linear groove extending from the inner hole in the work holding jig, and positioning and fixing the work with respect to the work holding jig by a work positioning mechanism and a clamp mechanism; In a grindstone angle measuring device of a groove grinder that grinds the linear groove of the work with a grindstone disk, a plurality of displacement sensors are held on a sensor holding table that is positioned and fixed to a work holding jig by a work positioning mechanism and a clamp mechanism. In addition, the displacement amount 0 position of each displacement sensor is aligned with a measurement reference plane set at a distance from the end surface of the grinding wheel disc in the direction of the rotation axis.
[0007]
According to a second aspect of the present invention, in the grindstone angle measuring device for a groove grinder according to the first aspect, four displacement sensors are provided, and each displacement sensor is arranged at a position corresponding to four corners of a rectangle.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
[Structure of groove grinder]
FIG. 1 shows a vane groove grinder for a compressor cylinder to which the present invention is applied. For convenience of explanation, the side where an index table (moving table) 2 for supplying a work is arranged is defined as a front side, and A description will be given below with the right-angle direction as the left-right direction.
[0009]
A left and right slider 4 is supported on the upper surface of the base 1 via a rail 3 extending in the left and right direction so as to be movable horizontally and horizontally. A ball screw feed mechanism 6 is interposed between the left and right slider 4 and the base 1, By driving the ball screw feed mechanism 6 with an AC servo motor (not shown), the left and right sliders 4 can be moved in the left and right directions.
[0010]
A vertical rail 8 is provided upright at the front end of the left and right sliders 4, and a vertical slider 10 is supported on the front surface of the vertical rail 8 so as to be vertically movable. A ball screw feed mechanism 12 in a vertical position is interposed between the upper and lower sliders 10 and the rear surface of the vertical rail 8, and the lead screw of the ball screw feed mechanism 12 has an AC servo disposed at the upper end of the vertical rail 8. The vertical slider 10 can be vertically moved by the AC servomotor 13 by being linked to the output shaft of the motor 13.
[0011]
A drive unit base 11 is fixed to the front surface of the upper half of the upper and lower sliders 10, and a motor 15 for rotating a grinding wheel disk and a power take-out shaft 25 are fixed to the drive unit base 11 vertically. A grindstone head 16 is detachably fixed to the lower front surface of the upper and lower sliders 10 by a plurality of mounting bolts 12, and a support 17 projecting downward is fixed to the grindstone head 16, and is provided at a lower end of the support 17. The grindstone disk 20 is rotatably supported on the support shaft 21. The rotating shaft 21 of the grindstone disc 20 is arranged in the horizontal direction, so that the grindstone disc 20 is located in a vertical plane extending in the front-rear direction.
[0012]
The grinding wheel disc 20 is operatively connected to a power take-off shaft 25 via a belt drive mechanism 24, and the power take-off shaft 25 is operatively connected to the output shaft of the upper wheel drive motor 15 via a belt drive mechanism 26. .
[0013]
The circular index table 2 is disposed in front of the base in a horizontal posture, and a vertical rotation shaft 28 of the index table 2 is rotatably supported by a table support case 29 and is interlocked with a drive motor (not shown). The index is set so as to rotate the index by 90 °.
[0014]
FIG. 2 is a plan view of the index table 2 and the work W. The work W is formed in a cylindrical shape having an inner hole 40, and has a sector-shaped overhang 41 and a positioning projection at a position symmetrical to the overhang 41. 42 are formed integrally, and a linear vane groove 43 extending radially outward from the inner hole 40 and reaching an intermediate position of the fan-shaped overhang 41 is integrally formed. A first positioning hole 45 is formed in the projection 42, and a second positioning hole 46 is formed in the vicinity of one circumferential end of the fan-shaped overhang 41.
[0015]
On the index table 2, four work holding jigs 36 are fixed at 90 ° intervals on the same circumference, and each work holding jig 36 is such that the index table 2 is turned by 90 ° in the direction of arrow R. By rotating, the front end loading and unloading position P1, the left end positioning and clamping position P2, the rear end grinding position P3, and the right end measurement position P4 are sequentially visited.
[0016]
At the center of each work holding jig 36, a through-hole 37 substantially corresponding to the inner hole 40 of the work W is formed, and the through-hole 37 is wider than the vane groove 43 of the work W and has a table rotation axis O1. A grinding stone insertion groove 38 extending to the side is formed. On the upper surface of the work holding jig 36, first and second positioning pins 48 and 49 corresponding to the first and second positioning holes 45 and 46 of the work W are provided to project upward as a work positioning mechanism.
[0017]
A bifurcated clamp arm 51 is arranged on the table rotation axis O1 side of each work holding jig 36, and a handle 51a of each clamp arm 51 has a horizontal support shaft 52 as shown in FIG. The handle 51a is rotatably supported by the clamp table 53 via a link 54, and the tip end of the handle 51a is connected to a rod 55 that can expand and contract in the vertical direction. That is, by moving the distal end of the handle 51a in the vertical direction by the expansion and contraction of the rod 55, the clamp arm 51 can be changed between a clamp position indicated by a solid line and an unclamped position indicated by a virtual line.
[0018]
A groove positioning jig 56 for finally positioning the vane groove 43 is disposed radially outward of the index table 2 at the positioning and clamping position P2. The groove positioning jig 56 is provided with a split pin 60 for groove positioning which can be fitted into the vane groove 43 of the work W facing downward at a tip end of an elevating arm 59 supported to be vertically movable on a vertical rail 57. ing. The elevating arm 59 is driven up and down by a cylinder 61.
[0019]
[Whetstone disk]
FIG. 8 is an enlarged horizontal cross-sectional view of the grindstone disc 20. The grindstone disc 20 has a rotating disk 22 rotatably supported by a support shaft 21 and both ends of the outer peripheral end of the rotating disk 22 in the direction of the rotation axis. The grinding wheel 23 is formed of a ring-shaped grinding wheel 23 fixed to the surface. The grinding wheel 23 binds the abrasive grains together with a ceramic metal bond and is fixed to the rotating disk 22. Is also formed.
[0020]
[Whetstone angle adjustment mechanism]
FIG. 4 is a horizontal sectional view of the grinding wheel head 16 (a sectional view taken along line IV-IV of FIG. 3). A front end surface of the upper and lower sliders 10 has a columnar pin 31 protruding forward fixed thereto. A pin hole 32 is formed, and the whetstone head 16 is fastened to the upper and lower sliders 10 by the mounting bolts 12 in a state where the pin hole 32 is fitted to the pin 31.
[0021]
FIG. 3 is a front view of the grinding wheel head 16 (an enlarged cross-sectional view taken along the line III-III of FIG. 1). The center of the pin hole 32 is located at the center of the grinding wheel head 16 in the vertical direction. They are located in the same vertical plane. The mounting bolts 12 are arranged at the four corners of the grindstone head 16 and have a certain clearance between the bolt insertion holes of the grindstone head 16. Therefore, in a state where each mounting bolt 12 is loosened, the grindstone head 16 is rotatable around the pin 31 within the play of the mounting bolt 12, whereby the grindstone head 16 is mounted around the pin 31. The angle can be fine-tuned.
[0022]
In order to finely adjust the mounting angle of the grinding wheel head 16, a pair of upper and lower angle adjusting screws 35 are disposed so as to be in contact with the left and right end surfaces of the grinding wheel head 16, respectively. Each angle adjusting screw 35 is arranged at the same height as the mounting bolt 12 in the vicinity, and is fixed to the upper and lower sliders 10 and is screwed into the screw block 33, and is fixed at a predetermined projecting position by the lock nut 34. Have been. That is, by adjusting the amount of protrusion of each angle adjusting screw 35, the mounting angle of the grinding wheel head 16 around the pin 31 is finely adjusted, whereby the angle θ of the grinding wheel disk 20 with respect to the upper mounting surface of the work holding jig 36 is adjusted. That is, the squareness can be finely adjusted.
[0023]
[Whetstone angle measuring device]
6 to 9 show an embodiment of a grindstone angle measuring device 58 to which the present invention is applied. FIG. 7 shows a plan view of the index table 2 and a plan view of the grindstone angle measuring device 58 when the grindstone angle measuring device 58 is mounted. In FIG. A plurality of displacement sensors 65 are attached to an annular sensor holding base 62 having the following. Each of the displacement sensors 65 is connected to a controller (not shown) having a measurement value display unit.
[0024]
In the inner hole 63 of the sensor holder 62, a grindstone insertion groove 64 extending linearly outward in the radial direction of the sensor holder 62 is formed. On the lower surface of the sensor holder 62, the work holding jig 36 of the work holding jig 36 is formed. First and second positioning holes 71 and 72 are formed at positions corresponding to the first and second positioning pins 48 and 49, respectively.
[0025]
FIG. 8 is a partial horizontal sectional view of the grindstone angle measuring device 58. The grindstone insertion groove 64 has a width of about 2 to 4 times the width of the grindstone disc 20, and at least one of the widths of the grindstone insertion groove 64 in the width direction. The end surface 64a is used as a measurement reference surface 64a of the displacement sensor 65 by being finished at a right angle to the lower end mounting surface of the sensor holding base 62. The measurement reference surface 64a is a surface on which the displacement amount of the displacement sensor 65 is to be zero. The measurement reference surface 64a is provided with a sensor mounting screw hole 66 perpendicular to the measurement reference surface 64a. 65 is screwed. The tip detection surface of each displacement sensor 65 is opposed to the end surface of the grinding wheel disc 20 in the rotation axis direction at an interval in the rotation axis direction.
[0026]
The wall portion where the screw hole 66 is formed has a step surface 69 parallel to the measurement reference surface 64a, so that the displacement sensor 65 can be easily screwed into the screw hole 66 from the step surface 69 side. It is. As the displacement sensor 65, an eddy current displacement sensor is used, and a voltage (or current) that changes according to the distance to a measurement object in front is input to the controller, and the displacement from the measurement reference plane 64a is displayed in digital form. The amount can be measured.
[0027]
FIG. 9 is a cross-sectional view taken along the line IX-IX of FIG. 8. Four displacement sensors 65 are provided, and are respectively arranged at four corners of a vertically long rectangle to perform four-point measurement. Further, it is fixed by a fixing screw 68 screwed into a fixing screw hole formed at right angles to the screw hole 66.
[0028]
[Action]
[Groove grinding work]
The operation of grinding the vane groove 43 of the work W will be described with reference to FIG. At the front-end loading and unloading position P1, the work W is placed on the upper surface of the work holding jig 36, and the first and second positioning holes 45 and 46 are fitted to the first and second positioning pins 48 and 49. At this time, the second positioning hole 46 is fitted to the second positioning pin 49 with some play.
[0029]
At the left end positioning and clamping position P2, the groove positioning pin 60 is pressed into the vane groove 43 of the work W by lowering the groove positioning elevating arm 59, thereby the work holding jig 36. The work W is fixed to the work holding jig 36 by accurately setting the position of the vane groove 43 with respect to the work and lowering the clamp arm 51 in this state. Thereafter, the lifting arm 59 for positioning the groove is raised.
[0030]
At the rear end grinding position P3, the grindstone disc 20 is lowered together with the support 17 to be inserted into the inner hole 40 of the work W, and while the grindstone disc 20 is being rotated, it is moved up and down and moved in the rotation axis direction. Then, both edges in the width direction of the vane groove 43 of the work W are ground. At this time, the acoustic sensor 30 detects an initial position at which the grindstone disc 20 comes into contact with each edge in the width direction of the vane groove 43, and grinds a predetermined cutting amount from each initial position.
[0031]
At the measurement position P4, the width of the vane groove 43 is measured, the position returns to the loading and unloading position P1, the clamp 51 is released, and the ground work W is removed.
[0032]
[0 position adjustment of whetstone angle measuring device]
In FIG. 8, a flat plate for setting the zero position is pressed against the measurement reference surface 64a of the sensor holding base 62, and the position of the flat plate is set to the zero position of each displacement sensor 65. That is, in a state where the distance from each displacement sensor 65 to the measurement reference surface 64a varies, even if each displacement sensor 65 is attached, the measurement reference surface 64a is set as the zero position of all the displacement sensors 65.
[0033]
[Wheelstone angle measurement and adjustment method]
A method for measuring the grinding wheel angle θ and adjusting the squareness after replacing the grinding wheel disk 20 with the grinding wheel head 16 will be described. In FIG. 7, the grindstone angle measuring devices 58 are drawn at the loading and unloading positions P1, the positioning and clamping positions P2, the grinding positions (measuring positions) P3, and the measuring positions P4, respectively. The state of each position P1, P2, P3, and P4 of one grindstone angle measuring device 58 is shown instead of using 58.
[0034]
At the loading and unloading positions P1, the sensor holding table 62 is placed on the upper surface of the work holding jig 36, and the first and second positioning holes 71, 72 are formed in the first and second positioning pins 48, 49. At this time, the first and second positioning holes 71 and 72 are fitted in the first and second positioning pins 48 and 49 in a state without play. It is accurately positioned at a position corresponding to the vane groove.
[0035]
Next, at the positioning and clamping position P2 (or at the loading and unloading position P1), the sensor holding table 62 is fixed to the work holding jig 36 by lowering the clamp arm 51. As a result, the lower end mounting surface of the sensor holding base 62 is fixed in a horizontal posture by the upper end work mounting surface of the work holding jig 36, whereby the measurement reference surface 64a of the grindstone insertion groove 64 in FIG. It is fixed at a right angle to the upper end mounting surface.
[0036]
At the grinding position P3 in FIG. 7, the grinding wheel disc 20 is lowered until the rotation axis O2 comes to the center position between the upper and lower displacement sensors 65 as shown in FIG. The displacement amounts of the four points of the disk 20 from the measurement reference plane 64a are measured.
[0037]
While observing the measured values on the screen of the controller, the mounting bolt 12 of the grindstone head 16 shown in FIG. 6 is loosened, and the grindstone head 16 is rotated around the pin 31 with the angle adjusting screw 35 to adjust four points. The measured value is matched to a predetermined value. Thereby, the perpendicularity of the angle θ of the grinding wheel disc 20 to the upper end mounting surface of the work holding jig 36 is finely adjusted.
[0038]
After the grindstone angle adjustment, the sensor holder 62 is removed at the measurement position P4 in FIG.
[0039]
[Other embodiments]
(1) In the illustrated embodiment, an index table that rotates around a vertical axis is provided as a moving table on which a work holding jig is mounted, but a groove that includes a moving table that reciprocates linearly in a horizontal direction. It is also possible to apply to a grinder.
[0040]
(2) In the illustrated embodiment, the displacement sensors 65 are arranged on only one surface of the grindstone insertion groove 64 as shown in FIG. 8, but four displacement sensors may be arranged on both end surfaces.
[0041]
(3) If four displacement sensors are arranged at the four corners of the rectangle as shown in FIG. 8, it is advantageous in terms of accuracy and cost, but it is also possible to arrange two or three displacement sensors on one side of the groove. It is possible, and it is also possible to arrange five or more.
[0042]
(4) As the displacement sensor, various non-contact displacement sensors such as a laser irradiation type can be used in addition to the eddy current type.
[0043]
【The invention's effect】
As described above, according to the present invention, (1) a sensor holding table having a plurality of displacement sensors is positioned and fixed to a work holding jig on a table using a work positioning mechanism and a clamp mechanism; Since the angle of the grinding wheel disk is finely adjusted, the angle of the grinding wheel disk can be quickly and accurately adjusted without performing trial grinding using a test work or the like. In other words, the work of adjusting the angle of the grindstone accompanying the work of exchanging the grindstone does not require much trouble, and the test work is not wasted by the trial grinding.
[0044]
(2) Since the grindstone angle measuring device is mounted only when necessary by using a work holding jig, a work positioning mechanism and a clamp mechanism for fixing and holding the work at a predetermined position, it is mounted exclusively for the measuring device. No members are required, the number of parts can be saved, and there is no need to secure extra space for arranging the measuring device.
[0045]
(3) If four displacement sensors are provided and the respective displacement sensors are arranged at positions corresponding to the four corners of the rectangle, measurement can be performed with more accurate accuracy.
[Brief description of the drawings]
FIG. 1 is a side view showing, in partial cross section, a groove grinder to which the present invention is applied.
FIG. 2 is a plan view of the index table of FIG. 1;
FIG. 3 is an enlarged cross-sectional view taken along the line III-III of FIG. 1;
FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;
FIG. 5 is an enlarged partial front view of an index table at a positioning and clamping position.
FIG. 6 is an enlarged cross-sectional view of the same portion as FIG. 3 showing a state in which a grindstone angle measuring device is attached instead of a work.
FIG. 7 is a plan view of an index table showing a state of a sensor holder at each index position.
FIG. 8 is a partially enlarged horizontal cross-sectional view of the grindstone angle measuring device.
FIG. 9 is a sectional view taken along line IX-IX of FIG. 8;
[Explanation of symbols]
Reference Signs List 1 base 2 index table 20 grindstone disk 21 grindstone shaft 36 work holding jigs 45, 46 first and second positioning holes (positioning mechanism)
48, 49 First and second positioning pins (positioning mechanism)
51 Clamp arm (clamp mechanism)
58 Grinding wheel angle measuring device 62 Sensor holder 64 Grinding wheel insertion groove 64a Measurement reference surface 65 Eddy current type displacement sensor 71, 72 First and second positioning holes (positioning mechanism)

Claims (2)

A grinding wheel disk is provided so as to be movable in the direction of the axis of rotation and in a direction perpendicular to the direction of the axis of rotation, a work holding jig is fixed to a work supply table, and an inner hole and an inner hole are provided in the work holding jig. Groove grinding that holds a work having a linear groove extending from the workpiece, positions and fixes the work on a work holding jig by a work positioning mechanism and a clamp mechanism, and grinds the linear groove of the work with a grindstone disk. In the grinding wheel angle measuring device of the board,
A plurality of displacement sensors are held on a sensor holder that is positioned and fixed on the work holding jig by the work positioning mechanism and the clamp mechanism.
A groove grinding machine characterized in that the displacement amount 0 position of each displacement sensor is aligned with a measurement reference plane set at an interval in the rotation axis center direction with respect to the end face of the grinding wheel disk in the rotation axis center direction. Whetstone angle measuring device. 2. The grindstone angle measuring device for a groove grinder according to claim 1, further comprising four displacement sensors, each of which is arranged at a position corresponding to four corners of a rectangle.

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