JP4320678B2 - 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. .

  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 of the slit for accommodating the vane, a round hole at the bottom of the slit, and a spline hole that fits the rotating shaft, together with the outer shape. Here, the groove width dimension of the slit lower groove is formed to a dimension smaller than the final dimension of the slit in view of allowance in slit grinding performed later. Then, the slit is finished to the final dimension by grinding the lower groove with a grindstone having a width of the grindstone so as to penetrate the bottom round hole.

Japanese Patent Laid-Open No. 2003-239871

  In the conventional manufacturing method, since the slit is formed based on the lower groove, if the angle of the lower groove is not accurate, an error also occurs in the slit accuracy. That is, in the production of the rotor by sintering molding, the slit for mounting the vane was formed as a lower groove with a rough dimension before finishing, and then a grindstone was inserted along the lower groove to form the slit. The accuracy of the slit depends on the lower groove, and it is impossible to capture how many times the groove angle of the slit after processing is.

  Conventionally, there has also been an apparatus for simultaneously forming slits of a plurality of rotors in order to increase productivity. In this case, a pair of rotors synchronized with the front and rear as viewed from the operator, and a groove grinding machine with a pair of grindstones that simultaneously form the slits of these rotors were also used. This complicates the means for arranging and a mechanism for arranging a pair of grindstones, which increases the manufacturing cost of the groove grinding machine and necessitates a large installation space.

  Therefore, the present invention was created to solve the above-mentioned problems, and the accuracy of slits formed in the rotor is high, and a plurality of rotors can be processed simultaneously, and the rotor for a vane pump with high productivity can be ground. The object is to provide a method and a grinding apparatus.

  In order to achieve the above object, the grinding method of the first means of the present invention is a grinding method of a vane pump rotor for grinding a slit for storing a vane along a lower groove R1 formed in the rotor R for the vane pump, The rotor R is fixed on the turntable 12 arranged below the camera 11, and one of the lower grooves R1 of the rotor R is set to the reference position by the turntable 12, and each lower groove R1 from the center of the rotor R is set. A measuring step 100 for measuring the angle by image processing, an angle commanding step 200 for instructing the NC index 41 to set the slit setting angle when the angle of the lower groove R1 is within the slit setting angle range, and an angle of the lower groove R1 being the slit setting angle range A correction command process 300 for commanding the slit correction angle to the NC index 41 when the slit setting angle with respect to the lower groove R1 is changed. A moving step 400 in which the rotor R is moved from the turntable 12 and fixed to the fixture 31, and the fixture 31 is installed on the NC index 41 to align the lower groove R1 of the rotor R with the set angle of the slit; The grinding method includes a grinding step 500 that rotates the NC index 41 based on the angle command step or the correction command step and grinds the slit of the rotor R on the NC index 41.

The second grinding method is to exclude the rotor R from the turntable 12 when the angle of the lower groove R1 measured in the measuring step 100 is out of the slit set angle range.

The grinding device of the third means is a grinding device for a vane pump rotor that grinds a slit for storing the vane B along a lower groove R1 formed in the vane pump rotor R, and is a rotation device disposed below the camera 11. The rotor R is fixed on the table 12, and one of the lower grooves R1 of the rotor R is set to the reference position by the rotating table 12, and the angle of each lower groove R1 from the center of the rotor R is measured from the image of the camera 11. The image processing means 10, the control means 20 for instructing the slit setting angle to the NC index 41 based on the measured angle of the lower groove R1, and the measured rotor R are moved from the turntable 12 and fixed to the fixture 31, The NC unit 41 rotates on the basis of a command from the control unit 20 and the moving unit 30 installed on the NC index 41 together with the fixing device 31. The lower groove R1 of the rotor R is aligned to the setting angle of the slit, in that a grinding means 40 for grinding the slit at grinding wheel 42.

According to a fourth grinding apparatus, in the moving means 30, the fixing tool 31 is a rotor that is moved from the rotary table 12 to the fastening bolt 32 that is erected and fixed to the fixing tool 31 without changing the reference position. The center portion of R is inserted, and a fastening nut 33 distributed from a nut runner 34 installed above the fastening bolt 32 is fastened to the fastening bolt 32 to fix the rotor R to the fixture 31. The fixture 31 is provided so as to be fixed on the NC index 41 without changing the reference position of the rotor R.

In a fifth grinding apparatus, in the grinding means 40, the grinding wheel 42 uses a CBN grinding wheel, a width dressing device 43 for adjusting the grinding width of the grinding wheel 42, and an outer periphery dress 44 for adjusting the outer periphery of the grinding wheel 42; It is a means for solving the problem to have.

According to the first and third aspects of the present invention, even when the angle of the lower groove R1 provided in advance in the rotor R is slightly deviated from the slit setting angle, the slit can be ground with an accurate setting angle.

According to the second aspect of the present invention , since the rotor R having a lower angle accuracy of the lower groove R1 is excluded from the turntable 12, rational grinding can be performed.

By using the fixture 31 of claim 4 , the rotor R whose angle of the lower groove R <b> 1 is measured can be mounted on the NC index 41 efficiently and accurately.

According to the fifth aspect , 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 slits formed in the rotor have a high accuracy, and there are various beneficial effects such that it is possible to form the slits extremely rationally for a plurality of rotors. is there.

  The best mode of the device of the present invention is a vane pump rotor grinding device for grinding a slit for storing a vane along a lower groove R1 formed in the vane pump rotor R. The rotary table is disposed below the camera 11. An image in which the rotor R is fixed on 12 and one of the lower grooves R1 of the rotor R is set as a reference position by the turntable 12, and the angle of each lower groove R1 from the center of the rotor R is measured from the image of the camera 11. The processing means 10, the control means 20 for instructing the slit setting angle to the NC index 41 based on the measured angle of the lower groove R 1, the measured rotor R is moved from the turntable 12 and fixed to the fixture 31, The NC unit 41 rotates on the basis of a command from the control unit 20 and the moving unit 30 installed on the NC index 41 together with the fixture 31, Grinding means 40 for grinding the slit with a grinding wheel 42 in a state in which the lower groove R1 of the rotor R is aligned with the set angle of the slit. In the grinding means 40, the grinding wheel 42 uses a CBN grinding wheel. The initial object is achieved by providing the width dressing device 43 for adjusting the grinding width of the grinding wheel 42 and the outer periphery dress 44 for adjusting the outer periphery of the grinding wheel 42.

  Hereinafter, the present invention will be described based on illustrated examples. The grinding device of the present invention is a device that grinds a slit for vane storage in the rotor R for the vane pump, and grinds the slit along the lower groove R1 formed in the rotor R in advance. The basic configuration of the grinding apparatus of the present invention includes an image processing means 10, a control means 20, a moving means 30, and a grinding means 40.

  The image processing means 10 is a device that measures the angle of the lower groove R1 of the rotor R based on an image (see FIG. 3) taken by the camera 11 (see FIG. 4). That is, the rotor R is fixed on the turntable 12 arranged below the camera 11. Next, the turntable 12 is rotated to set one of the lower grooves R1 of the rotor R as a reference position, and the angle of each lower groove R1 from the center of the rotor R is measured from the image of the camera 11. The camera 11 uses a camera used in a normal image processing apparatus, and preferably a CCD camera.

  In the illustrated example, the camera 11 is fixed to the upper part of the camera support shaft 13 and the reflective illumination device 14 is fixed to the lower part. The reflection illumination device 14 can illuminate the lower groove R <b> 1 of the rotor R clearly by illuminating from the obliquely upper side of the rotor R below the camera 11. Further, the turntable 12 is linked to the pulse motor 16 and rotates any one of the lower grooves R1 so as to be aligned with the twelve o'clock direction shown in FIG. 3, thereby setting a lower groove R1 as a reference position, and this reference lower groove R1. The rotation angle of the other lower groove R1 is measured with the image of the camera 11.

  As a means for attaching the rotor R to the turntable 12, a turntable 15 is used in the illustrated example (see FIG. 5). This turntable 15 moves the rotor R placed on the turntable 15 below the camera 11 and lowers the turntable 15, so that the rotor R is fitted and fixed to the support shaft 12 </ b> A of the turntable 12. To do. At this time, the turntable 12 fixes the rotor R by a means such as providing a fixing chuck or providing a convex portion that fits into the shaft hole of the rotor R (not shown).

  The control means 20 uses a control device that commands the NC index 41 to set the slit angle based on the measured angle of the lower groove R1. By this control device, the angle of each lower groove R1 is calculated from the image of the camera 11, and a predetermined grinding angle or a corrected correction angle is commanded to the NC index 41. Further, when a malfunction is detected such that the angle of the lower groove R1 is outside the grinding range of the slit, a command is given to exclude the malfunctioning rotor R from the turntable 12. The rotation angle is calculated by a computer program provided in the image processing apparatus of the image processing means 10 (see FIG. 4).

  The moving means 30 is means for moving the measured rotor R from the turntable 12 and fixing it to the fixture 31, and then installing the fixture 31 together with the NC index 41 (see FIGS. 5 to 7). In order to move the rotor R from the turntable 12 to the fixture 31, a support arm 38 that reciprocates between the turntable 12 and the fixture 31 is used. The support arm 38 grips and lifts the outer periphery of the rotor R on the turntable 12, moves to the fixture 31 as it is, and places the rotor R on the fixture 31 (see FIG. 5).

  At this time, the reference position of the lower groove R1 of the rotor R placed on the turntable 12 is fixed so as to be installed at a fixed position of the fixture 31, and this fixed position is a grinding angle on the NC index 41 described later. Are conveyed to the NC index 41 together with the rotor R. Therefore, when fixing the rotor R to the fixing tool 31, it is necessary to fix the rotor R so that the angle of the rotor R does not go wrong. Therefore, in the present invention, the fastening bolt 32 erected on the fixture 31 is inserted through the central portion of the rotor R translated from the turntable 12. Next, the fastening nut 33 distributed from the nut runner 34 provided at the upper end of the fastening bolt 32 is screwed to the fastening bolt 32, and the side surface of the rotor R is fastened and fixed to the fixture 31. (See FIG. 5). Further, when the fixing tool 31 is attached to the NC index 41, it is fixed by means such as providing unevenness at the joint between the fixing tool 31 and the NC index 41 so that the reference position of the lower groove R1 does not go wrong. The tool 31 is fixed to the NC index 41 (not shown).

  In order to move the fixture 31 to the NC index 41, a transport unit 35 that transports the fixture 31 together with the rotor R onto the NC index 41, and a loading chuck 36 that fixes the fixture on the NC index 41 to the NC index 41. It has. Further, an unloading chuck 37 for removing the rotor R after the grinding process from the NC index 41 is also provided (see FIGS. 6 and 7). By such moving means 30, the rotor R can be automatically attached to and detached from the NC index 41. At this time, the fixture 31 and the NC index 41 are provided in advance with a fitting portion so that they can be mounted at a fixed position in advance, so that the fixture 31 and the NC index 41 are fixed without changing the reference position of the lower groove R1. Is something that can be done. The used fixture 31 is removed from the rotor R and reused.

  The grinding means 40 rotates the NC index 41 based on a command from the control means 20, aligns the lower groove R1 of the rotor R on the NC index 41 with the set angle of the slit, and grinds the slit with the grinding wheel 42. (See FIG. 10). By using a rotary grindstone made of CBN for the grinding wheel 42, the slit groove width can be processed to 1.00 mm or less. The illustrated grinding means 40 is configured such that an NC index 41 is slidably mounted on an NC table device 43, a grinding wheel 42 is disposed substantially at the upper center of the NC table device 43, and the grinding wheel 42 is rotated at this position. Yes (see FIG. 8). Then, by sliding the NC index 41 on the NC table device 43, the lower groove R1 portion of the rotor R is brought into contact with the grinding wheel 42 to grind the slit (see FIG. 10).

  On the side opposite to the NC index 41 in the grinding wheel 42, a width dressing device 44 for adjusting the grinding width of the grinding wheel 42 is installed and slidably mounted on the NC table device 43 (see FIG. 9). This width dressing device 44 increases the grinding accuracy of the CBN grindstone, and when a new grinding grindstone 42 is set, the width dressing device 44 slides in the direction of the grinding grindstone 42 and slits the width of the grinding grindstone 42. The grinding width is adjusted. Therefore, this width dressing device 44 is used every time the grinding wheel 42 is replaced.

  Further, an outer periphery dress 45 for adjusting the outer periphery of the grinding wheel 42 is provided above the grinding wheel 42 (see FIG. 9). The outer peripheral dress 45 increases the outer peripheral accuracy of the grinding wheel 42, and by combining with the width dressing device 44, an accurate slit can always be ground.

  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 measurement process 100, the angle command process 200, the correction command process 300, the movement process 400, and the grinding process 500 (see FIG. 1).

  In the measurement process 100, the rotor R is fixed on the turntable 12 disposed below the camera 11, and one of the lower grooves R <b> 1 of the rotor R is set to the reference position by the turntable 12, and the center of the rotor R is set. This is a step of measuring the angle of each lower groove R1 by image processing. At this time, when the measured angle of the lower groove R1 is out of the slit setting angle range, the rotor R can be excluded from the turntable 12. Then, the process proceeds to the next step only when the measured angle of the lower groove R1 is within the slit setting angle range.

  The angle commanding process 200 is a process of commanding the slit setting angle to the NC index 41 when the angle of the lower groove R1 is within the slit setting angle range. That is, the groove width of the lower groove R1 is narrower than the groove width of the slit. Even if the angle of the lower groove R1 is slightly deviated from the set angle of the slit, if the lower groove R1 is in a position that fits in the slit, the angle commanding process 200 is used for grinding.

  The correction commanding process 300 is a process of commanding the corrected slit angle to the NC index 41 when the slit setting angle is changed due to the user's request or the like when the angle of the lower groove R1 is within the range of the slit setting angle. In this case as well, the lower groove R1 needs to be within the corrected slit setting angle.

  In the moving step 400, the measured rotor R is moved from the turntable 12 and fixed to the fixture 31, and the fixture 31 is installed on the NC index 41 to align the lower groove R1 of the rotor R with the set angle of the slit. It is a process to do. In the apparatus of the present invention, the moving means 30 is adopted, but any moving means that can be mounted on the NC index 41 while maintaining the measured angle of the lower groove R1 may be used.

  At this time, when simultaneously grinding a plurality of rotors R, the following steps are performed. That is, the rotor R measured in the measuring step 100 is fixed by overlapping a plurality of rotors R on the fixture 31 of the moving step 400. If the angle of each of the stacked lower grooves R1 does not completely match, the angle commanding step 300 instructs the NC index 41 to set a slit setting angle that matches any one of the lower groove R1 angles, or In the correction command process 400, a slit correction angle obtained by changing the slit setting angle from the angle of each lower groove R1 is commanded to the NC index 41.

  The grinding process 500 is a process of grinding the slit of the rotor R along the lower groove R1. That is, the NC index 41 is rotated based on the angle command process 200 or the correction command process 300, and the slit processing portion of the rotor R on the NC index 41 is set toward the grinding wheel 42 side. Grind. In the apparatus of the present invention, the grinding accuracy of the grinding wheel 42 is increased by using the width dressing device 44 and the outer peripheral dress 45 in the grinding process 500.

  In the apparatus of the present invention, the design of the image processing means 10, the control means 20, the moving means 30, and the grinding means 40 can be freely changed, and the specifications and mounting positions of each apparatus are within the scope not changing the gist of the present invention. It can be arbitrarily changed.

It is process drawing which shows this invention method. It is a block diagram which shows the operation | work order in this invention method. It is a figure which shows the lower groove | channel of the rotor image | photographed with the image processing means of this invention apparatus. It is a side view which shows the image processing means of this invention apparatus. It is a front view which shows the image processing means of this invention apparatus. It is a top view which shows the moving means of this invention apparatus. It is a front view which shows the moving means of this invention apparatus. It is a top view which shows the grinding means of this invention apparatus. It is a front view which shows the grinding means of this invention apparatus. It is an enlarged front view which shows the grinding means of this invention apparatus.

Explanation of symbols

R Rotor R1 Lower groove 10 Image processing means 11 Camera 12 Turntable 13 Camera support shaft 14 Reflecting illumination device 15 Turntable 16 Pulse motor 20 Control means 30 Moving means 31 Fixing tool 32 Fixing bolt 33 Fixing nut 34 Nut runner 35 Conveyance unit 36 Loading chuck 37 Unloading chuck 38 Support arm 40 Grinding means 41 NC index 42 Grinding wheel 43 NC table device 44 Width dressing device 45 Peripheral dress 100 Measuring process 200 Angle command process 300 Correction command process 400 Moving process 500 Grinding process

Claims (5)

  A vane pump rotor grinding method for grinding a vane storage slit along a lower groove formed in a vane pump rotor, wherein the rotor is fixed on a turntable disposed below a camera, Set one of the lower grooves of the rotor as the reference position, and measure the angle of each lower groove from the center of the rotor by image processing, and if the lower groove angle is within the slit setting angle range, set the slit setting angle to the NC index An angle commanding step for commanding to the NC, a correction commanding step for commanding the slit correction angle to the NC index when the slit setting angle for the lower groove is changed within the slit setting angle range, and the measured rotor Move from the turntable and fix to the fixture, and install the fixture together on the NC index to align the lower groove of the rotor with the set angle of the slit And a grinding process for rotating the NC index based on the angle command process or the correction command process and grinding the slit of the rotor on the NC index. .   The method for grinding a rotor for a vane pump according to claim 1, wherein the rotor is excluded from the rotary table when the angle of the lower groove measured in the measuring step is out of the slit setting angle range.   A vane pump rotor grinding device for grinding a slit for storing a vane along a lower groove formed in a vane pump rotor, wherein the rotor is fixed on a turntable disposed below a camera, One of the lower grooves of the rotor is set as a reference position, the image processing means for measuring the angle of each lower groove from the center of the rotor from the image of the camera, and the slit setting angle based on the measured angle of the lower groove as an NC index The control means for commanding, the measured rotor is moved from the turntable and fixed to the fixture, and the NC index is rotated on the basis of the command of the control means, the moving means installed on the NC index together with the fixture, and the NC A grinding means for aligning the lower groove R1 of the rotor R on the index 41 with the set angle of the slit and grinding the slit with a grinding wheel. Grinding device of the vane pump rotor, characterized in that. In the moving means, the fixing tool is inserted through the center of the rotor moved without changing the reference position from the rotating base into the fixing bolt standing and fixed on the fixing tool, and above the fixing bolt. The fastening nut distributed from the installed nut runner is fastened to the fastening bolt to fix the rotor to the fixture, and the fixture is fixed on the NC index without changing the reference position of the rotor. The grinding device of the rotor for vane pumps according to claim 3 provided. 4. The vane pump rotor grinding according to claim 3 , wherein in the grinding means, the grinding wheel uses a CBN grinding wheel, and includes a width dressing device for adjusting a grinding width of the grinding wheel and an outer peripheral dress for adjusting an outer periphery of the grinding wheel. apparatus.

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