JP5317296B2 - Vane pump rotor grinding method and grinding apparatus - Google Patents

Description

  The present invention relates to a vane pump rotor grinding method and a grinding apparatus suitable for grinding a slit of a vane pump rotor used in various industrial equipment, vehicle power steering and the like.

  In general, a vane pump has a rotor in which slits for slidably storing substantially plate-like vanes are formed in a radial direction. A cam ring is provided outside the rotor, and vanes are mounted in the slits of the rotor. The pump action is performed by the rotation of the rotor. That is, when the rotor rotates, the substantially plate-like vane protrudes in the radial direction from the rotor, and the tip slides while contacting the inner peripheral surface of the cam ring. At this time, since the inner peripheral surface of the cam ring has a substantially elliptical shape, the volume of the chamber surrounded by the inner peripheral surface of the cam ring, the outer peripheral surface of the rotor, and the vanes expands and contracts as the rotor rotates. Then, a liquid suction port is provided at a position where the volume of the side surface of the room increases, and a liquid discharge port is provided at a position where the volume decreases, thereby performing a pumping action by rotation of the rotor. . Therefore, the vane pump is an extremely important part for the power steering of the vehicle.

  The rotor of the vane pump described in Patent Document 1 is manufactured as follows. That is, the rotor material is simultaneously formed with a lower groove for accommodating the vane, a round hole at the bottom of the slit, and a spline hole that fits into the rotating shaft. Here, the groove width dimension of the slit lower groove is formed to be smaller than the final dimension of the slit in consideration of a margin in slit grinding performed later. Then, the slit is finished to the final dimension by grinding the lower groove with a grindstone having a finished dimension width so as to penetrate the bottom round hole.

  However, in the manufacturing method of Patent Document 1, since a slit is formed by inserting a grindstone into the lower groove in a state very close to the finished dimensions, the accuracy of the slit depends on the lower groove, and the angle of the lower groove is not accurate. This also causes an error in slit accuracy.

  Therefore, the present applicant has previously proposed a grinding method and apparatus for performing groove processing by measuring the angle of each lower groove from the center of the rotor by image processing (Patent Document 2). In this grinding method, the groove width allocation of the material is measured by image processing in the previous process, the correction value is fed back to the NC index, and the slit of the rotor moved on the NC index is ground.

Japanese Patent Laid-Open No. 2003-239871 Japanese Patent No. 4320678

  By the grinding method and apparatus of patent document 2, the precision of the slit was able to be improved compared with the past. However, after measuring the lower groove of the rotor, the correction value is fed back to the NC index, and the process of moving the rotor from the rotating table for measurement to the fixed table for grinding is required. Inconveniently required a lot of time.

  In addition, in image processing using a camera, the accuracy of the correction value is affected by the camera resolution, lighting conditions, and the like. In particular, when measuring the lower groove of the slit, all the lower grooves reflected in the lens are measured at a time, so that when the illumination for shooting is applied to the slit, irregular reflections or shadows may occur even in a small part. In such a case, the irregularly reflected light or shadow has a disadvantage of hindering the measurement of the camera.

  Therefore, the present invention was created to solve the above-mentioned problems, and the accuracy of the slit formed in the rotor is high, and the processing time from the measurement of the lower groove to the finishing of the slit to the final dimension can be shortened. An object of the present invention is to provide a highly productive grinding method and apparatus for a vane pump rotor.

In order to achieve the above-described object, the grinding method of the first means of the present invention supports the rotor R rotatably through a pulse motor 12 installed in the NC processing machine 10, and the laser digital measuring machine 20 forms slits. A belt-like laser 21 wider than the width of the lower groove R1 is irradiated in parallel to the lower groove R1, and the passing range of the laser 21 passing through the lower groove R1 is measured so that the lower groove R1 is positioned at the center of the measurement width of the laser 21. The rotation angle of the lower groove R1 is indexed by rotating the pulse motor 12, and the allocation angle of each lower groove R1 is stored as NC data. by grinding the slit, a grinding method of the vane pump rotor for grinding the slit of the vane pump rotor R,
A rotor support step 100 for rotatably supporting the rotor R on a collet chuck device 30 mounted on the NC processing machine 10, and a laser of the laser digital measuring machine 20 in a lower groove R 1 formed on the outer periphery of the rotor R 21 and the indexing step 200 for indexing the allocation angle of the lower groove R1 by the rotation operation of the pulse motor 12 interlocked with the collet chuck device 30, and the core of each lower groove R1 around the entire circumference of the rotor R. Storage step 300 for storing the assigned angle as NC data, a moving step 400 for moving the collet chuck device 30 together with the rotor R to move the lower groove R1 of the rotor R to the grinding position, and a lower groove for the rotor R at the grinding position. After adjusting R1 to an allocation angle based on the NC data, the rotor R is fixed, and the slit is ground by the grinding wheel 14. A grinding step 500, in the grinding method comprising.

The second means is a vane pump rotor grinding device for grinding a slit for storing a vane along a lower groove R1 formed in the rotor R for the vane pump, and is mounted on the rotating disk 13 of the NC processing machine 10. The collet chuck device 30, the laser digital measuring machine 20 that irradiates the lower groove R 1 of the rotor R that is rotatably fixed to the collet chuck device 30, and calculates the allocation angle of the lower groove R 1, and the collet chuck device 30 Is connected to the pulse motor 12 which rotates the rotor R supported by the collet chuck device 30 and feeds back the allocated angle of the lower groove R1 around the rotor R as NC data, and the collet chuck device 30 is arranged on the bed 11. A rotary disk 13 that moves together with the chuck device 30 to place the rotor R at a grinding position, and allocation based on NC data Possess a grinding wheel 14, a grinding machining on the left and right the same machining allowance relative to the adjusted lower grooves R1 whenever the grinding wheel 14 using the CBN wheel, width dress adjust the grinding width of the grinding whetstone 14 The grinding device includes an apparatus 15, an outer periphery dress 16 that adjusts the outer periphery of the grinding wheel 14, and a clamp device 50 that presses the side surface of the rotor R toward the collet chuck device 30 .

According to the first and second aspects of the present invention, the slit is ground with the same cutting allowance for the lower groove R1 provided in advance in the rotor R, so that a very accurate slit can be ground.

The steps according to claim 1, a rotor mounted on the collet chuck device 30, no measurement error because entering the chuck after measurement. Therefore, rational grinding using the NC processing machine 10 is possible.

According to the first and second aspects, even when the width of the slit is set to 1.0 mm or less, high-precision grinding can be performed.

  As described above, according to the present invention, the accuracy of the slit formed in the rotor is high, and the processing time from the measurement of the lower groove to finishing the slit to the final dimension can be shortened, and the productivity can be increased. It has various beneficial effects.

It is a figure which shows the state which measures the position of the lower groove of a rotor with this invention apparatus. It is a figure which shows the state which measures the allocation angle of a lower groove with this invention apparatus. It is a principle figure which measures the allocation angle of a lower groove with the device of the present invention. It is a figure which shows the state which grinds a lower groove with the grinding wheel of this invention apparatus. It is a schematic plan view which shows this invention apparatus. It is a schematic front view which shows this invention apparatus. It is a schematic side view which shows this invention apparatus. It is process drawing which shows this invention method. It is a block diagram which shows the operation | work order in this invention method.

  According to the present invention, the laser digital measuring machine 20 irradiates a belt-like laser 21 wider than the lower groove R1 of the slit in parallel to the lower groove R1, measures the passing range of the laser 21 passing through the lower groove R1, and The rotor R is rotated so that the laser 21 passing range is in the belt-like central position of the laser 21 to determine the allocation angle of the lower groove R1, and the slit is ground with the same left and right cutting allowance for the lower groove R1. This makes it possible to provide the rotor R with extremely high slit accuracy.

  Hereinafter, the present invention will be described based on illustrated examples. The basic configuration of the grinding apparatus of the present invention is constituted by an NC processing machine 10, a laser digital measuring machine 20, a collet chuck device 30, and an attaching / detaching device 40.

  The NC processing machine 10 is a device equipped with a collet chuck device 30 on its bed 11 and a pulse motor 12, a rotating disk 13, a grinding wheel 14 and the like (see FIG. 6). In this NC processing machine 10, the allocation angle of the lower groove R <b> 1 of the rotor R supported by the collet chuck device 30 is measured by the laser digital measuring machine 20 and the pulse motor 12 as NC data, and this NC data is used as the pulse motor 12. And the rotor R is ground by the grinding wheel 14.

  The collet chuck device 30 is a device that removably supports the rotor R by inserting and expanding the collet 31 into the shaft hole R2 of the rotor R (see FIG. 1). The collet 31 is interlocked with the pulse motor 12, and the supported rotor R is rotated by the pulse motor 12.

  The laser digital measuring machine 20 irradiates the belt-shaped laser 21 from the projector 22 to the light receiver 23, and irradiates the lower groove R <b> 1 of the rotor R that is rotatably fixed to the collet chuck device 30. It is a measuring machine which calculates the allocation angle of lower groove R1 (refer to Drawing 2). This laser 21 has a width wider than that of the lower groove R1 of the slit, and irradiates the lower groove R1 in parallel (see FIG. 3). Then, by measuring the passing range of the laser 21 passing through the lower groove R1 and rotating the pulse motor 12 so that the lower groove R1 is positioned at the center of the measurement width of the laser 21, the allocation angle of the lower groove R1 is determined. Yes (see FIG. 2). In this way, the respective allocation angles of the respective lower grooves R1 measured by the laser digital measuring machine 20 are stored as NC data and fed back to the pulse motor 12 during the grinding process. As the laser digital measuring instrument 20, for example, a commercially available digital dimension measuring instrument using a Green LED and a telecentric lens is suitable, but other laser digital measuring instruments 20 can also be used.

  When grinding the lower groove R1, the collet chuck device 30 at the allocation angle measurement position of the lower groove R1 is moved together with the rotor R by rotating the turntable 13 of the bed 11, and the rotor R is installed at the grinding position (FIG. 5). The turntable 13 is provided on the bed 11 of the NC processing machine 10, and a pair of collet chuck devices 30 are mounted on the turntable 13 in parallel in the front-rear direction. In the vicinity of the rotor R supported by one collet chuck device 30, a laser digital measuring machine 20 and an attachment / detachment device 40 for attaching / detaching the rotor R to / from the collet 31 are arranged. The attaching / detaching device 40 in the illustrated example is configured to remove the ground rotor R from the collet 31 and store it in the ground tray 41, and to pick up the rotor R from the unground tray 42 and attach it to the collet 31. .

  A grinding wheel 14 is disposed at a position for grinding the rotor R mounted on the collet 31 of the other collet chuck device 30 (see FIG. 5). These attaching / detaching devices 40 and the grinding wheel 14 are disposed on both sides of the rotating disk 13. Then, when the turntable 13 rotates, the rotor R before grinding moves to the grinding position and is ground, and the rotor R that has already been slit is moved by the attachment / detachment device 40 so that the rotor R is removed from the collet 31. And replaced with an unground rotor R.

  The grinding wheel 14 grinds the slit with the same cutting margin on the left and right sides of the lower groove R1 of the rotor R fixed to the collet 31. Therefore, based on the NC data, the rotor R supported by the collet 31 by the pulse motor 12 is rotated, and the lower groove R1 of the rotor R is set to an allocation angle. At this time, the rotor R supported by the collet 31 may be shaken at the time of grinding if it is left as it is. Therefore, in order to firmly fix the rotor R supported by the collet 31, a clamp device 50 that crimps the side surface of the rotor R toward the collet chuck device 30 is provided (see FIGS. 1 and 5). The clamp device 50 in FIG. 1 is shown together with the laser digital measuring machine 20 for the sake of convenience, but is actually disposed at the grinding position of the grinding wheel 14 as shown in FIG. The clamp device 50 is located away from the rotor R when detecting the allocation angle of the lower groove R1, and presses the rotor R when grinding the rotor R with the grinding wheel 14.

  By using a CBN rotary grindstone for the grinding wheel 14, the slit groove width can be reduced to 1.00 mm or less. The illustrated grinding wheel 14 arranges the grinding wheel 14 on the bed 11 of the NC processing machine 10, rotates the grinding wheel 14 and slides it up and down in the rotor R direction (see FIG. 6). And the slit for vane accommodation is ground with the same left and right cutting allowance with respect to lower groove R1 (refer to Drawing 4).

  A width dressing device 15 for adjusting the grinding width of the grinding wheel 14 is installed near the grinding wheel 14 and is slidably mounted on the NC table device 43 (see FIG. 5). The width dressing device 15 increases the grinding accuracy of the CBN grindstone, and when the new grinding grindstone 14 is set, the width dressing device 15 adjusts the width of the grinding grindstone 14 to the grinding width of the slit. Therefore, this width dressing device 15 is used every time the grinding wheel 14 is replaced.

  Further, an outer periphery dress 16 for adjusting the outer periphery of the grinding wheel 14 is provided above the grinding wheel 14 (see FIG. 6). The outer peripheral dress 16 increases the outer peripheral accuracy of the grinding wheel 14, and by combining with the width dressing device 15, an accurate slit can always be ground (see FIG. 7).

  Next, a grinding method using the apparatus of the present invention will be described. The grinding method of the present invention comprises the following five steps. That is, the supporting process 100, the indexing process 200, the angle storing process 300, the moving process 400, and the grinding process 500 (see FIG. 8).

  The supporting step 100 is a step of rotatably supporting the rotor R on the collet chuck device 30 mounted on the NC processing machine 10. In this step, an unground rotor R is mounted on the collet 31 of the collet chuck device 30 using the attachment / detachment device 40 (see FIG. 5).

  In the indexing step 200, the lower groove R1 formed on the outer periphery of the rotor R is irradiated with the laser 21 of the laser digital measuring machine 20, and the lower groove R1 is allocated by the rotation operation of the pulse motor 12 interlocked with the collet chuck device 30. The angle is determined (see FIG. 1). At this time, the rotor R is rotatably supported via the pulse motor 12, and the laser digital measuring machine 20 irradiates a belt-like laser 21 wider than the width of the lower groove R1 of the slit in parallel to the lower groove R1. Then, by measuring the passing range of the laser 21 passing through the lower groove R1 and rotating the pulse motor 12 so that the lower groove R1 is positioned at the center of the measurement width of the laser 21, the allocation angle of the lower groove R1 is determined. Yes (see FIG. 2).

  In the angle storage process 300, the NC processing machine 10 stores each allocation angle obtained by indexing the core of each lower groove R1 around the entire circumference of the rotor R as NC data.

  The moving step 400 is a step of moving the collet chuck device 30 together with the rotor R to move the lower groove R1 of the rotor R to the grinding position. In this case, the collet chuck device 30 provided with the pulse motor 12 is moved together with the rotor R by using the turntable 13 provided on the bed 11 (see FIGS. 5 and 7).

  The grinding process 500 is a process of adjusting the lower groove R1 of the rotor R to the allocation angle based on the NC data at the grinding position, and then fixing the rotor R and grinding the slits with the grinding wheel 14. That is, the slit processing portion of the rotor R together with the collet chuck device 30 is set toward the grinding wheel 14 and the slit is ground in this state (see FIG. 5). At this time, the slit for storing the vane is ground with the same left and right cutting allowance with respect to the lower groove R1 based on the NC data.

  As described above, the grinding method according to the present invention supports the rotor R rotatably through the pulse motor 12 installed in the NC processing machine 10, and the band shape wider than the width of the lower groove R 1 of the slit by the laser digital measuring machine 20. The laser 21 is irradiated in parallel to the lower groove R1, the passing range of the laser 21 passing through the lower groove R1 is measured, and the pulse motor 12 is rotated so that the lower groove R1 is positioned at the center of the measurement width of the laser 21. The allocation angle of R1 is indexed, the allocation angle of each lower groove R1 is stored as NC data, and the slit for vane storage is ground with the same cutting allowance for the lower groove R1 based on the NC data. (See FIG. 9).

  In the apparatus of the present invention, the design change of the NC processing machine 10, the laser digital measuring machine 20, the collet chuck apparatus 30, the detaching apparatus 40, the clamping apparatus 50, etc. is free. It can be arbitrarily changed without changing the gist of the above.

  Although the embodiment of the present invention is described as a rotor R for a vane pump used for various industrial equipment, power steering of a vehicle, etc., it is also used as a method and apparatus for grinding slits of other rotors and parts. It is possible.

R rotor R1 lower groove 10 NC processing machine 11 bed 12 pulse motor 13 rotating disk 14 grinding wheel 15 width dressing device 16 outer periphery dress 20 laser digital measuring machine 21 laser 22 projector 23 light receiver 30 collet chuck device 31 collet 40 attachment / detachment device 41 Ground tray 42 Unground tray 43 NC table device 50 Clamp device 100 Supporting process 200 Indexing process 300 Angle storage process 400 Moving process 500 Grinding process

Claims (2)

Rotatably supports the rotor through a pulse motor installed in the NC machine, the wide strip of the laser than the width of the lower groove of the slit parallel to irradiate the lower groove by the laser digital measuring instrument, passed through the lower groove laser Rotating the pulse motor so that the lower groove is positioned at the center of the laser measurement width, indexing the lower groove allocation angle, and storing the allocation angle of each lower groove as NC data. based on by grinding the slit for the vane accommodating the left and right the same machining allowance relative to the lower groove, a grinding method of the vane pump rotor for grinding the slit of the vane pump rotor,
A rotor support step for rotatably supporting the rotor on a collet chuck device mounted on the NC processing machine ;
An indexing step of irradiating the lower groove formed on the outer periphery of the rotor with the laser of the laser digital measuring machine, and indexing an allocation angle of the lower groove by a rotation operation of the pulse motor interlocked with a collet chuck device ;
An angle storage step of storing each allocation angle obtained by indexing the core of each lower groove on the entire circumference of the rotor as NC data ;
A moving step of moving the collet chuck device together with the rotor and moving the lower groove of the rotor to a grinding position ;
For a vane pump , comprising: adjusting a lower groove of a rotor at a grinding position to an allocation angle based on the NC data; and then fixing the rotor and grinding the slit with the grinding wheel. Rotor grinding method. A vane pump rotor grinding device for grinding a slit for storing a vane along a lower groove formed in a rotor for a vane pump,
A collet chuck device mounted on a rotating disk of an NC processing machine;
A laser digital measuring machine that irradiates a lower groove of a rotor rotatably fixed to the collet chuck device with a laser, and calculates an allocation angle of the lower groove;
A pulse motor linked to the collet chuck device, which rotates the rotor supported by the collet chuck device and feeds back the allocation angle of the lower groove all around the rotor as NC data;
A rotating disk disposed on the bed, moving the rotor together with the collet chuck device, and setting the rotor at a grinding position;
A grinding wheel that performs grinding with the same machining allowance on the lower groove adjusted to the allocation angle based on NC data;
The grinding wheel uses a CBN grinding wheel, the width dressing device for adjusting the grinding width of the grinding wheel, the outer peripheral dress for adjusting the outer periphery of the grinding wheel, and the clamping device for pressing the side surface of the rotor toward the collet chuck device And a rotor grinding apparatus for a vane pump.

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