WO2019163799A1

WO2019163799A1 - Grinding system and grinding method

Info

Publication number: WO2019163799A1
Application number: PCT/JP2019/006206
Authority: WO
Inventors: 一徳須摩
Original assignee: Ntn株式会社
Priority date: 2018-02-23
Filing date: 2019-02-20
Publication date: 2019-08-29
Also published as: JP6971168B2; JP2019141978A

Abstract

When an initial value h and a target value L for a differential width HD satisfy h>L, a control device places an outer ring (11) on a rotary table (20) so that the front side end face is the face to be ground and places an inner ring (12) on the rotary table (20) so that the back side end face is the face to be ground. When h<L is satisfied, the control device places the outer ring (11) on the rotary table (20) so that the back side end face is the face to be ground and places the inner ring (12) on the rotary table (20) so that the front side end face is the face to be ground. The control device grinds the faces to be ground on the outer ring (11) and the inner ring (12) until one of the faces to be ground, which is the back side end face of one of the face to be ground on the outer ring (11) and the face to be ground on the inner ring (12), is ground by a thickness of the target amount ∆h to be ground.

Description

Grinding system and grinding method

The present invention relates to a grinding system and a grinding method for an outer ring and an inner ring of an angular ball bearing.

In angular ball bearings, in order to obtain a predetermined amount of preload, the difference width (plane difference) between the end faces on one axial side of the inner ring and the outer ring is adjusted to a specified value.

For example, Japanese Patent Laying-Open No. 2016-16487 (Patent Document 1) discloses a method for adjusting a difference width between a first outer ring end face on one axial side of an outer ring and a first inner ring end face on one axial side of an inner ring. Is disclosed. Specifically, the second inner ring end face and the first outer ring end face opposite to the first inner ring end face are positioned on the reference plane, and the second outer ring end face and first inner ring end face opposite to the first outer ring end face are ground. . At this time, the second outer ring end face and the first inner ring end face are ground until the first inner ring end face is ground by the difference width machining amount. The difference width processing amount is obtained by comparing the difference width measured in advance with the target difference width.

JP 2016-16487 A

In the method described in JP-A-2016-16487, the second outer ring end surface and the first inner ring end surface are ground. This presupposes that the difference width between the first outer ring end face and the first inner ring end face approaches the target difference width by grinding the first inner ring end face. However, there are various combinations of the inner ring and the outer ring that constitute the angular ball bearing. There may be a combination in which the difference width between the first outer ring end face and the first inner ring end face is away from the target difference width by grinding the first inner ring end face. For this reason, the method described in JP-A-2016-16487 cannot cope with various combinations of the inner ring and the outer ring.

The present invention has been made in order to solve the above-described problems, and the object thereof is to cope with various combinations of the inner ring and the outer ring in the angular ball bearing, and the width difference between the end faces of the inner ring and the outer ring. It is providing the grinding system and grinding method which can adjust.

A grinding system for grinding an outer ring and an inner ring of an angular ball bearing according to the present disclosure includes a table, and a surface to be ground upward of the first end surface and the second end surface of the outer ring placed on the table, and the table A combination of a surface grinding machine that grinds an upward grinding target surface of the first end surface and the second end surface of the mounted inner ring, a conveying device that conveys the outer ring and the inner ring onto a table, and an outer ring and an inner ring in combination. And a control device that executes a first control that adjusts a difference width between the first end surface of the outer ring and the first end surface of the inner ring when the ball bearing is manufactured. In the first control, when the comparison result between the initial value of the difference width and the target value satisfies the first condition in the first control, the control device controls the conveying device so that the outer ring is adjusted so that the second end surface becomes the surface to be ground. Place on the table, place the inner ring on the table so that the first end surface is the surface to be ground, and when the comparison result satisfies the second condition, control the transfer device to grind the first end surface The outer ring is placed on the table so as to be the target surface, and the inner ring is placed on the table so that the second end surface is the grinding target surface. The first condition is a condition in which the initial value is larger than the target value when the difference width is a positive value when the first end surface of the inner ring protrudes from the first end surface of the outer ring, and the first end surface of the inner ring is When the difference width is a negative value when projecting from the first end face of the outer ring, the initial value is smaller than the target value. The second condition is a condition in which the initial value is smaller than the target value when the difference width when the first end face of the inner ring protrudes from the first end face of the outer ring is a positive value, and the first end face of the inner ring is When the difference width is a negative value when projecting from the first end face of the outer ring, the initial value is larger than the target value. In the first control, the control device is configured so that one of the grinding target surfaces, which is the first end face among the grinding target surface of the outer ring and the grinding target surface of the inner ring, is ground by the thickness of the difference between the initial value and the target value. The grinding machine is controlled to grind the grinding target surfaces of the outer ring and the inner ring.

Preferably, in the first control, the control device performs surface grinding when the grinding amount of the other grinding target surface which is the second end surface among the grinding target surface of the outer ring and the grinding target surface of the inner ring is less than the target grinding amount. The second control for adjusting the widths of the outer ring and the inner ring is executed by controlling the board and the conveying device. In the second control, the control device controls the conveying device to place the outer ring on the table so that the second end surface is the surface to be ground, and the inner ring is the table so that the second end surface is the surface to be ground. Place on top. The control device controls the surface grinder to grind the grinding target surfaces of the outer ring and the inner ring until the grinding amount of the other grinding target surface in the second control reaches the target grinding amount.

Preferably, the grinding system further includes a cleaning device for cleaning the table.
The grinding method of the present disclosure is a grinding method using a surface grinder that grinds an outer ring and an inner ring of an angular ball bearing. The surface grinding machine has a table, and among the first end surface and the second end surface of the outer ring placed on the table, the surface to be ground upward, the first end surface of the inner ring placed on the table, and the second end surface. Grind the upward grinding target surface among the end faces. As for the grinding method, the comparison result between the initial value of the difference width between the first end face of the outer ring and the first end face of the inner ring when the angular contact ball bearing is manufactured by combining the outer ring and the inner ring satisfies the first condition. In this case, the outer ring is placed on the table so that the second end face is the surface to be ground, and the inner ring is placed on the table so that the first end face is the surface to be ground. When satisfy | filling, it has the process of mounting an inner ring | wheel on a table so that a 2nd end surface may become a grinding object surface while placing an outer ring | wheel so that a 1st end surface may become a grinding object surface. The first condition is a condition in which the initial value is larger than the target value when the difference width is a positive value when the first end surface of the inner ring protrudes from the first end surface of the outer ring, and the first end surface of the inner ring is When the difference width is a negative value when projecting from the first end face of the outer ring, the initial value is smaller than the target value. The second condition is a condition in which the initial value is smaller than the target value when the difference width is a positive value when the first end surface of the inner ring protrudes from the first end surface of the outer ring, and the first end surface of the inner ring is When the difference width is a negative value when projecting from the first end face of the outer ring, the initial value is larger than the target value. The grinding method further uses a surface grinder until one of the outer ring and the inner ring whose first end face is the surface to be ground is ground by the thickness of the difference between the initial value of the difference width and the target value. And grinding a surface to be ground of the outer ring and the inner ring.

</ RTI> According to the grinding system and the grinding method of the present disclosure, it is possible to deal with various combinations of the inner ring and the outer ring in the angular ball bearing, and the difference width between the end faces of the inner ring and the outer ring can be adjusted.

It is sectional drawing which shows an example of the angular ball bearing used as the grinding object of the grinding system which concerns on embodiment. It is a top view which shows an example of the grinding system which concerns on embodiment. It is a perspective view which shows schematically the structure of the surface grinder shown in FIG. It is a side view which shows the turntable shown in FIG. 3, and its support mechanism. It is a figure which shows schematically the structure of the grindstone unit shown in FIG. It is sectional drawing which shows the outer ring | wheel and the inner ring | wheel mounted on the turntable when it is h> L. It is sectional drawing which shows the outer ring | wheel and the inner ring | wheel mounted on the turntable when it is h <L. It is sectional drawing which shows the outer ring | wheel and the inner ring | wheel which were mounted on the rotary table in width alignment control. It is a flowchart which shows an example of the flow of a process in a grinding system. It is a figure which shows the process pattern in a grinding system.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated. Further, the embodiments and modifications described below may be combined appropriately and selectively.

(Angular ball bearing)
FIG. 1 is a cross-sectional view showing an example of an angular ball bearing to be ground by the grinding system according to the embodiment. As shown in FIG. 1, the angular ball bearing 10 includes an outer ring 11 and an inner ring 12 that constitute a pair of race rings, a plurality of rolling elements 13, and a cage 14. A straight line (a dashed line in the figure) connecting the contact point between the rolling element 13 and the outer ring 11 and the contact point between the rolling element 13 and the inner ring 12 is inclined by a contact angle with respect to the radial direction. Thereby, the angular ball bearing 10 can receive both an axial load and a radial load. When a radial load is applied to the angular ball bearing 10, a component force is generated in the axial direction. Therefore, normally, two angular ball bearings 10 are arranged and used in the axial direction.

The difference width (plane difference) HB between the rear end face 11B of the outer ring 11 and the rear end face 12B of the inner ring 12, and the difference width between the front end face 11F of the outer ring 11 and the front end face 12F of the inner ring 12 ( The plane difference (HF) is adjusted to a specified value in order to obtain a predetermined amount of preload. The difference width HB indicates a shift (step) in the axial direction between the end surface 11B and the end surface 12B. The difference width HF indicates an axial shift (step) between the end surface 11F and the end surface 12F. The angular ball bearing 10 in which the difference width HB and the difference width HF are adjusted to the same value is referred to as a flash ground angular contact ball bearing. In the case of a flash ground angular contact ball bearing, the width dimension Ho of the outer ring 11 and the width dimension Hi of the inner ring have the same value. By using a flash ground angular contact ball bearing, any combination method of two angular ball bearings 10 (a combination method in which the back surfaces face each other, a combination method in which the front surfaces oppose each other, and a combination method in which the back and front surfaces face each other) is predetermined. Can be obtained.

(Grinding system)
FIG. 2 is a plan view showing an example of a grinding system according to the embodiment. As shown in FIG. 2, the grinding system 100 includes a surface grinding machine 1, a loading conveyor 2, a temporary placing table 4, a transfer robot 6, a discharging conveyor 5, and a control device 7. In the grinding system 100, the difference width HB between the rear end face 11B of the outer ring 11 and the rear end face 12B of the inner ring 12 is a specified value, and the width dimension Ho of the outer ring 11 and the width dimension Hi of the inner ring 12 are the same value. The end faces 11B, 11F, 12B, and 12F are ground so that By combining the outer ring 11 and the inner ring 12 ground by the grinding system 100, a flash ground angular contact ball bearing can be manufactured.

The loading conveyor 2 conveys the workpiece W composed of the outer ring 11 and the inner ring 12. A swiveling stopper 3 is installed at the downstream end of the top surface of the loading conveyor 2. The workpiece W is conveyed by the loading conveyor 2 until it contacts the stopper 3. The workpiece W is conveyed by the loading conveyor 2 with the end faces 11B and 12B facing upward and the inner ring 12 being disposed inside the outer ring 11.

The difference width HB of each workpiece W is measured in advance before the workpiece W is loaded into the loading conveyor 2. The difference width HB of the workpiece W is a difference width between the end surface 11B and the end surface 12B when the angular ball bearing 10 is manufactured by combining the outer ring 11 and the inner ring 12 constituting the workpiece W. Here, the value (initial value) of the difference width HB measured before being loaded on the loading conveyor 2 is h. An initial value h measured in advance for each workpiece W is input to the control device 7.

The transfer robot 6 places the workpiece W transferred to the stopper 3 by the loading conveyor 2 on the temporary table 4. When the sensor detects the workpiece W, the stopper 3 turns. The transfer robot 6 grips the workpiece W that has been in contact with the rotated stopper 3 and transfers it to the temporary table 4. The transfer robot 6 places the outer ring 11 on the temporary placement table 4 so that the end surface instructed from the control device 7 of the end surface 11B and the end surface 11F faces upward. The transfer robot 6 places the inner ring 12 on the temporary placement table 4 so that the end face designated by the control device 7 among the end face 12B and the end face 12F faces upward. The transfer robot 6 grips the workpiece W placed on the temporary table 4 and transfers it to the surface grinding machine 1. The transfer robot 6 holds the workpiece W ground by the surface grinder 1 and transfers it onto the discharge conveyor 5.

The discharge conveyor 5 conveys the workpiece W ground by the surface grinding machine 1 to the next process. The surface grinding machine 1 grinds the end faces 11B, 11F, 12B, and 12F of the workpiece W. The control device 7 controls the surface grinding machine 1, the transfer robot 6, the loading conveyor 2 and the discharging conveyor 5. Details of the surface grinding machine 1 and the control device 7 will be described below.

(Surface grinding machine)
FIG. 3 is a perspective view schematically showing the configuration of the surface grinding machine 1. As shown in FIG. 3, the surface grinding machine 1 includes a rotary table 20, a cleaning device 30, a dimension measuring device 40, a grindstone unit 50, and a dresser 70.

The rotary table 20 is a table that rotates in the R direction in the figure by driving a motor (not shown). A work W is placed on the rotary table 20. At this time, the outer ring 11 (see FIG. 1) is placed on the rotary table 20 so that one of the end surface 11B and the end surface 11F faces upward. Similarly, the inner ring 12 (see FIG. 1) is placed on the turntable 20 so that one of the end surface 12B and the end surface 12F faces upward. The inner ring 12 is disposed inside the outer ring 11. The rotary table 20 includes a magnet chuck for attracting the workpiece W placed thereon.

FIG. 4 is a side view showing the rotary table 20 and its support mechanism. As shown in FIG. 4, the rotary table 20 is attached to the slide table 21 via a main shaft (not shown). When the main shaft is rotated by a motor (not shown), the rotary table 20 rotates with respect to the slide table 21. The slide table 21 is slidably disposed on the upper surface 22 of the bed 27. The slide table 21 and the rotary table 20 move along the X direction.

3, the cleaning device 30 includes a wiper 31 and cleans the rotary table 20 by turning the wiper 31 on the rotary table 20. Thereby, chips and abrasive grains on the rotary table 20 are removed.

The dimension measuring instrument 40 includes two

terminal portions

41 and 42, and measures the height of the tips of the

terminal portions

41 and 42 from the upper surface of the rotary table 20. The dimension measuring instrument 40 measures the width dimension Ho of the outer ring 11 by bringing the tip of the terminal portion 41 into contact with the upward end surface of the outer ring 11. Here, the value (initial value) of the width dimension Ho of the outer ring 11 measured by the dimension measuring instrument 40 before processing by the grindstone unit 50 is defined as Ho0. A value (measured value) of the width dimension Ho of the outer ring 11 measured by the dimension measuring instrument 40 during or after the processing by the grindstone unit 50 is defined as Ho1. The dimension measuring instrument 40 measures the width dimension Hi of the inner ring 12 by bringing the tip of the terminal portion 42 into contact with the upward end surface of the inner ring 12. Here, the value (initial value) of the width dimension Hi of the inner ring 12 measured by the dimension measuring instrument 40 before processing by the grindstone unit 50 is defined as Hi0. The value (measured value) of the width dimension Hi of the inner ring 12 measured by the dimension measuring instrument 40 during or after the processing by the grindstone unit 50 is defined as Hi1.

The dimension measuring device 40 always measures the position of the upper surface of the turntable 20 with a displacement sensor (not shown), and measures the width dimensions Ho and Hi based on the measured position. Thereby, even if the rotary table 20 moves due to thermal displacement of the main shaft or the like that rotates the rotary table 20, the dimension measuring instrument 40 can accurately measure the width dimension Ho of the outer ring 11 and the width dimension Hi of the inner ring 12.

The grindstone unit 50 is a unit that grinds the upward end surface of the workpiece W placed on the rotary table 20.

FIG. 5 is a diagram schematically showing the configuration of the grindstone unit 50. As shown in FIG. 5, the grindstone unit 50 includes a slide member 55, a rotation shaft 56, a grindstone 57, a support body 58, and a motor 59.

The support 58 is fixed to the frame of the surface grinding machine 1 (see FIG. 2). The slide member 55 is a member that can slide on the surface of the support 58, and slides in the Z direction (up and down direction). A motor 59, a rotary shaft 56, and a grinding wheel 57 are attached to the slide member 55. As the slide member 55 slides, the motor 59, the rotating shaft 56, and the grinding wheel 57 also slide in the Z direction (up and down direction) together with the slide member 55. The motor 59 is connected to one end of the rotating shaft 56 and rotates the rotating shaft 56. A grinding wheel 57 is attached to the other end of the rotating shaft 56. As a result, the grinding wheel 57 is rotated by the driving force of the motor 59.

Rotation shaft 56 is parallel to the X direction. As described above, the rotary table 20 is movable in the X direction. While the rotary table 20 is moved in the X direction, the grinding wheel 57 is brought into contact with the upward end surfaces of the outer ring 11 and the inner ring 12, whereby the end surface is traversed.

Returning to FIG. 3, the dresser 70 is installed below the grinding wheel unit 50 and dresses the surface of the grinding wheel 57 (see FIG. 5) of the grinding wheel unit 50. The dressing of the grinding wheel 57 by the dresser 70 is performed periodically.

(Control device)
The control device 7 includes a CPU (Central Processing Unit), a storage device, an input / output buffer and the like (all not shown), and controls the surface grinding machine 1, the transfer robot 6, the input conveyor 2 and the discharge conveyor 5. . When the CPU executes the program stored in the storage device, the surface grinding machine 1, the transfer robot 6, the input conveyor 2 and the discharge conveyor 5 are controlled. The control device 7 executes control for adjusting the difference width HB (difference width adjustment control) and control for adjusting the width dimensions of the outer ring 11 and the inner ring 12 (width adjustment control).

(Difference adjustment control)
Based on the initial value h of the difference width HB and the target value L measured in advance for each workpiece W, the control device 7 determines a target grinding amount Δh (removal: thickness to be ground) in the difference width adjustment control. . The initial value h and the target value L of the difference width HB are positive (+) when the end surface 12B of the inner ring 12 protrudes to the back side rather than the end surface 11B of the outer ring 11, and are negative (−) otherwise. To be measured. The control device 7 determines the absolute value of the difference between the initial value h and the target value L as the target grinding amount Δh. That is, the control device 7 sets the target grinding amount Δh = h−L when h> L, and sets the target grinding amount Δh = L−h when h <L.

Based on the comparison result between the initial value h and the target value L, the control device 7 determines which of the end surface 11B and the end surface 11F of the outer ring 11 is to be ground, and the end surface 12B and the end surface 12F of the inner ring 12. To determine which surface is to be ground. When h> L, the difference width HB approaches the target value L by grinding the end face 12B of the inner ring 12 without grinding the end face 11B of the outer ring 11. Therefore, when h> L, the control device 7 determines the end surface 11F of the outer ring 11 and the end surface 12B of the inner ring 12 as the surfaces to be ground. When h <L, the difference width HB approaches the target value L by grinding the end surface 11B of the outer ring 11 without grinding the end surface 12B of the inner ring 12. Therefore, when h <L, the control device 7 determines the end surface 11B of the outer ring 11 and the end surface 12F of the inner ring 12 as the surfaces to be ground.

The control device 7 instructs the transport robot 6 so that the end surface determined as the grinding target surface faces upward. The transfer robot 6 once places the outer ring 11 and the inner ring 12 of the workpiece W to be ground on the temporary placement table 4 so that the instructed end face is upward. Thereafter, the transfer robot 6 transfers the workpiece W to be ground from the temporary table 4 onto the rotary table 20 of the surface grinder 1 at the timing when the previous workpiece W is completely ground.

When the workpiece W on the rotary table 20 of the surface grinding machine 1 is conveyed, the control device 7 controls the surface grinding machine 1 so that the workpiece W is positioned below the grinding wheel 57 (see FIG. 5). The rotary table 20 is moved. Further, the control device 7 controls the grinding wheel unit 50 to rotate the grinding wheel 57 while moving the grinding wheel 57 downward along the Z direction to grind the upward end surface of the workpiece W. At this time, the control device 7 moves the rotary table 20 in the X direction and rotates it to traverse the workpiece W by traverse grinding.

FIG. 6 is a cross-sectional view showing the outer ring 11 and the inner ring 12 placed on the turntable 20 when h> L. As shown in FIG. 6, when h> L, the outer ring 11 and the inner ring 12 are on the turntable 20 so that the front end face 11F of the outer ring 11 and the rear end face 12B of the inner ring 12 face upward. Placed on. FIG. 7 is a cross-sectional view showing the outer ring 11 and the inner ring 12 placed on the turntable 20 when h <L. As shown in FIG. 7, when h <L, the outer ring 11 and the inner ring 12 are on the rotary table 20 so that the end surface 11B on the back side of the outer ring 11 and the end surface 12F on the front side of the inner ring 12 face upward. Placed on.

The control device 7 measures the width dimension Ho of the outer ring 11 and the width dimension Hi of the inner ring 12 by the dimension measuring instrument 40 (see FIG. 3) while grinding the workpiece W. When h> L, the control device 7 sets the end surface 11F of the outer ring 11 and the end surface 12B of the inner ring 12 until the initial value Hi0 of the width dimension Hi of the inner ring 12 and the measured value Hi1 satisfy Hi1 = Hi0−Δh. Grinding is performed by the grinding wheel 57. When h <L, the control device 7 sets the end surface 11B of the outer ring 11 and the end surface 12F of the inner ring 12 until the initial value Ho0 of the width dimension Ho of the outer ring 11 and the measured value Ho1 satisfy Ho1 = Ho0−Δh. Grinding is performed by the grinding wheel 57. Thereby, the difference width HB is adjusted to the target value L.

The control device 7 determines that the difference adjustment control is unnecessary when h = L, and executes the width adjustment control.

(Width adjustment control)
As the target grinding amount ΔH in the width matching control, a fixed value larger than the parallelism of the end surface 11F of the outer ring 11 and the end surface 12F of the inner ring 12 of the workpiece W is set in advance.

The control device 7 executes the width matching control when the grinding amount of the outer ring 11 or the inner ring 12 arranged so that the front end face is upward in the difference adjustment control is less than the target grinding amount ΔH. That is, when h> L, the control device 7 determines the measured value Ho1 and the initial value of the width dimension Ho of the outer ring 11 placed so that the end face 11F faces upward in the difference width adjustment control. The width matching control is executed when Ho0 satisfies Ho1> Ho0−ΔH. When h <L, the controller 7 determines the measured value Hi1 and the initial value Hi0 of the width dimension Hi after the difference width adjustment control of the inner ring 12 placed so that the end face 12F faces upward in the difference width adjustment control. Width matching control is executed when Hi1> Hi0−ΔH is satisfied. Further, the control device 7 executes the width matching control when h = L.

The control device 7 instructs the transfer robot 6 so that the end surface 11F of the outer ring 11 and the end surface 12F of the inner ring 12 face upward. As a result, the transfer robot 6 once places the workpiece W (the outer ring 11 and the inner ring 12) on the temporary table 4 and then transfers the work W (the outer ring 11 and the inner ring 12) onto the rotary table 20 of the surface grinding machine 1 so that the instructed end face is upward. . When the workpiece W is conveyed onto the rotary table 20 of the surface grinder 1, the surface grinder 1 is controlled to move the rotary table 20 so that the workpiece W is positioned below the grinding wheel 57 (see FIG. 5). Let Further, the control device 7 controls the grinding wheel unit 50 to rotate the grinding wheel 57 while moving the grinding wheel 57 downward along the Z direction to grind the upward end surface of the workpiece W. At this time, the control device 7 moves the rotary table 20 in the X direction and rotates it to traverse the workpiece W by traverse grinding.

FIG. 8 is a cross-sectional view showing the outer ring 11 and the inner ring 12 placed on the rotary table 20 in the width matching control. As shown in FIG. 8, the outer ring 11 and the inner ring 12 are placed on the rotary table 20 so that the end face 11F on the front side of the outer ring 11 and the end face 12F on the front side of the inner ring 12 face upward, and the end face 11F , 12F are ground by the grinding wheel 57.

The control device 7 measures the width dimension Ho of the outer ring 11 and the width dimension Hi of the inner ring 12 by the dimension measuring instrument 40 (see FIG. 3) while grinding the workpiece W. When h> L, the control device 7 determines that the initial value Ho0 and the measured value Ho1 of the width dimension Ho of the outer ring 11 with the front end face 11F facing upward are Ho1 = Ho0−ΔH. The end faces 11F and 12F are ground by the grinding wheel 57 until they are satisfied. That is, the end surfaces 11F and 12F are ground by the grinding wheel 57 until the grinding amount (Ho0−Ho1) of the end surface 11F of the outer ring 11 in the width matching control reaches the target grinding amount ΔH. When h <L, the control device 7 determines that the initial value Hi0 and the measured value Hi1 of the width dimension Hi of the inner ring 12 in which the front end face 12F is disposed upward also in the difference adjustment control, Hi1 = Hi0−ΔH. The end faces 11F and 12F are ground simultaneously by the grinding wheel 57 until they are satisfied. That is, the end surfaces 11F and 12F are ground by the grinding wheel 57 until the grinding amount (Hi0-Hi1) of the end surface 12F of the inner ring 12 in the width matching control reaches the target grinding amount ΔH.

When h = L, the control device 7 grinds the end faces 11F and 12F with the grinding wheel 57 until the measured value of the smaller width dimension of the outer ring 11 and the inner ring 12 changes by ΔH. Let That is, when the initial value Ho0 of the width dimension Ho of the outer ring 11 is smaller than the initial value Hi0 of the width dimension Hi of the inner ring 12, the control device 7 until the initial value Ho0 and the measured value Ho1 satisfy Ho1 = Ho0−ΔH. The end faces 11F and 12F are ground by the grinding wheel 57. When the initial value Hi0 of the width dimension Hi of the inner ring 12 is also smaller than the initial value Ho0 of the width dimension Ho of the outer ring 11, the control device 7 ends the end face 11F until the initial value Hi0 and the measured value Hi1 satisfy Hi1 = Hi0−ΔH. , 12F are simultaneously ground by the grinding wheel 57.

With the width adjustment control, the width dimension Ho of the outer ring 11 and the width dimension Hi of the inner ring 12 become the same value in a state where the difference width HB on the back side satisfies the target value L. Therefore, a flash ground angular contact ball bearing can be manufactured by combining the outer ring 11 and the inner ring 12.

(Processing flow of grinding system)
FIG. 9 is a flowchart illustrating an example of a processing flow in the grinding system 100. The grinding system 100 executes a series of processes shown in FIG. First, in step S <b> 1, the control device 7 determines whether or not the initial value h of the difference width HB measured in advance for the work W is larger than the target value L. When h> L is not satisfied (NO in step S1), in step S2, the control device 7 determines whether or not the initial value h of the difference width HB is smaller than the target value L.

If h> L (YES in step S1), in step S3, the transfer robot 6 places the outer ring 11 on the rotary table 20 so that the front end face 11F faces upward, and the rear end face 12B. The inner ring 12 is arranged on the turntable 20 so that the upper side faces upward. If h <L (YES in step S2), in step S4, the transfer robot 6 places the outer ring 11 on the turntable 20 so that the end surface 11B on the back side faces upward, and the end surface 12F on the front side. The inner ring 12 is arranged on the turntable 20 so that the upper side faces upward. In steps S <b> 3 and S <b> 4, the transfer robot 6 transfers the inner ring 12 and the outer ring 11 in this order onto the turntable 20. Furthermore, the outer ring 11 and the inner ring 12 are fixed on the rotary table 20 by a magnet chuck.

After step S3 and step S4, the surface grinder 1 executes differential width adjustment grinding in step S5. That is, the surface grinding machine 1 uses the upward end surfaces of the outer ring 11 and the inner ring 12 until the wheel (outer ring 11 or inner ring 12) arranged so that the end surface on the back side faces upward is ground by the target grinding amount Δh. Grind. The target grinding amount Δh is an absolute value of the difference between the initial value h of the difference width HB and the target value L. Specifically, when the end face 12B of the inner ring 12 is disposed upward, the surface grinding machine 1 causes the end face 12B of the inner ring 12 until the measured value Hi1 of the width dimension Hi of the inner ring 12 becomes (Hi0−Δh). And the end face 11F of the outer ring 11 are ground. When the end surface 11B of the outer ring 11 is disposed upward, the surface grinding machine 1 causes the end surface 11B of the outer ring 11 and the end surface of the inner ring 12 until the measured value Ho1 of the width dimension Ho of the outer ring 11 becomes (Ho0−Δh). Grind 12F.

Next, in step S6, the control device 7 has a grinding amount of the wheel (outer ring 11 or inner ring 12) in which the front end face in the differential width adjusting grinding is arranged upward is less than the target grinding amount ΔH in the width matching control. Determine whether or not. Specifically, when the end face 11F of the outer ring 11 is disposed upward in the difference width adjusting grinding, the control device 7 determines that the difference Ho0−Ho1 between the initial value Ho0 of the width dimension Ho of the outer ring 11 and the measured value Ho1 is It is determined whether it is less than the target grinding amount ΔH. When the end face 12F of the inner ring 12 is arranged upward in the differential width adjustment grinding, the control device 7 determines that the difference Hi0-Hi1 between the initial value Hi0 and the measured value Hi1 of the inner ring 12 is less than the target grinding amount ΔH. Judge whether there is.

If YES in step S6, in step S7, the transfer robot 6 places the outer ring 11 and the inner ring 12 on the rotary table 20 of the surface grinder 1 so that the front end faces 11F and 12F face upward. Even when h = L (NO in step S2), step S7 is executed because the differential width adjustment grinding is unnecessary.

Next, in step S8, the surface grinder 1 performs width alignment grinding. Specifically, in the surface grinder 1, when the outer ring 11 is arranged so that the end face 11F faces upward in the differential width adjustment grinding, the difference Ho0− between the initial value Ho0 of the width dimension of the outer ring 11 and the measured value Ho1. The end faces 11F and 12F are ground until Ho1 reaches the target grinding amount ΔH. Even when the surface grinder 1 is not executing the differential width adjustment grinding and the initial value Ho0 of the width dimension Ho of the outer ring 11 is smaller than the initial value Hi0 of the width dimension Hi of the inner ring 12, the difference Ho0-Ho1 is The end faces 11F and 12F are ground until the target grinding amount ΔH is reached. In the surface grinder 1, when the inner ring 12 is arranged so that the end face 12F faces upward in the differential width adjusting grinding, the difference Hi0-Hi1 between the initial value Hi0 of the width dimension of the inner ring 12 and the measured value Hi1 is the target grinding amount. The end faces 11F and 12F are ground until ΔH is reached. The surface grinder 1 does not perform the differential width adjustment grinding, and the difference Hi0-Hi1 is the target grinding even when the initial value Hi0 of the width dimension of the inner ring 12 is smaller than the initial value Ho0 of the width dimension of the outer ring 11. The end faces 11F and 12F are ground until the amount ΔH is reached.

Next, in step S9, the magnetic chuck of the turntable 20 is turned off, and the transfer robot 6 transfers the outer ring 11 and the inner ring 12 on the turntable 20 onto the discharge conveyor 5 in this order. If NO in step S6, step S9 is also executed.

Next, in step S10, the cleaning device 30 rotates the wiper 31 to clean the rotary table 20. Thereby, the process with respect to one workpiece | work W by the grinding system 100 is completed.

FIG. 10 is a diagram showing a processing pattern in the grinding system 100. The processing pattern A is a pattern in the case of YES in step S1 and NO in step S6. In the processing pattern A, the end face 12B on the back side of the inner ring 12 is ground by the target grinding amount Δh in the differential width adjustment grinding, and the width matching grinding is not executed. The processing pattern B is a pattern in the case of YES in step S1 and YES in step S6. In the processing pattern B, the end face 12B on the back side of the inner ring 12 is ground by the target grinding amount Δh in the differential width adjusting grinding, and the width matching grinding is executed. The processing pattern C is a pattern in the case of YES in step S2 and NO in step S6. In the processing pattern C, the end face 11B on the back side of the outer ring 11 is ground by the target grinding amount Δh in the differential width adjusting grinding, and the width matching grinding is not executed. The processing pattern D is a pattern in the case of YES in step S2 and YES in step S6. In the processing pattern D, the end face 11B on the back side of the outer ring 11 is ground by the target grinding amount Δh in the differential width adjusting grinding, and the width matching grinding is executed. The machining pattern E is a pattern in the case of NO in step S2. In the processing pattern E, the differential width adjusting grinding is not executed, and the width adjusting grinding is executed.

If YES in step S6, the transfer robot 6 rearranges the outer ring 11 or the inner ring 12 upside down. Therefore, the outer ring 11 and the inner ring 12 are temporarily retracted to the temporary placing table 4 in this order by the transfer robot 6. At this time, it is preferable that the cleaning device 30 cleans the rotary table 20 by turning the wiper 31. Furthermore, it is preferable to wash the outer ring 11 and the inner ring 12 using an air nozzle or a cleaner (not shown).

Before step S1, the cleaning device 30 may clean the rotary table 20 by turning the wiper 31.

When the surface grinder 1 is performing differential width adjustment grinding or width alignment grinding, the transfer robot 6 feeds the next workpiece W so that the surface to be ground determined by the control device 7 faces upward. 2 may be transferred to the temporary table 4. Thereby, the processing efficiency of the grinding system 100 can be improved.

(advantage)
As described above, the control device 7 in the difference adjustment control (first control), when the comparison result between the initial value h of the difference HB and the target value L satisfies h> L (first condition), The outer robot 11 is placed on the rotary table 20 so that the end surface (second end surface) 11F becomes the surface to be ground by controlling the transport robot (transport device) 6, and the end surface (first end surface) 12B is the surface to be ground. The inner ring 12 is placed on the rotary table 20 so that When the comparison result satisfies h <L (second condition), the control device 7 controls the transfer robot 6 to place the outer ring 11 on the rotary table 20 so that the end surface (first end surface) 11B becomes the surface to be ground. The inner ring 12 is placed on the rotary table 20 so that the end surface (second end surface) 12F becomes a surface to be ground. Further, in the differential width adjustment control, the control device 7 grinds one grinding target surface, which is the rear end face among the grinding target surface of the outer ring 11 and the grinding target surface of the inner ring 12, by a thickness of the target grinding amount Δh. Until then, the surface grinding machine 1 is controlled to grind the grinding target surfaces of the outer ring 11 and the inner ring 12. The target grinding amount Δh is an absolute value of the difference between the initial value h and the target value L.

According to the above configuration, the grinding target surfaces of the outer ring 11 and the inner ring 12 are automatically determined according to the comparison result between the initial value h and the target value L. Then, the grinding target surfaces of the outer ring 11 and the inner ring 12 are ground until one grinding target surface which is an end surface on the back side is ground by the thickness of the target grinding amount Δh. Thereby, whatever the combination of the outer ring 11 and the inner ring 12 is, the difference width HB between the rear end face 11B and the end face 12B can be automatically adjusted to the target value L.

Furthermore, the operator does not adjust the differential width HB while visually checking the contact between the grinding wheel 57 and the workpiece W. The surface to be ground is ground while measuring the grinding amount of the surface to be ground using the dimension measuring instrument 40. Therefore, variation in the difference width HB by the operator can be suppressed.

Further, in the differential width adjustment control, the control device 7 has the grinding amount of the other grinding target surface, which is the front end face among the grinding target surface of the outer ring 11 and the grinding target surface of the inner ring 12, being less than the target grinding amount ΔH. In this case, the surface grinding machine 1 and the transfer robot 6 are controlled to execute width matching control for matching the width dimensions of the outer ring 11 and the inner ring 12. In the width matching control, the control device 7 controls the transport robot 6 so that the outer ring 11 is placed on the rotary table 20 so that the end surface 11F becomes the grinding target surface, and the end surface 12F becomes the grinding target surface. The inner ring 12 is placed on the rotary table 20. The control device 7 controls the surface grinder 1 to grind the grinding target surfaces of the outer ring 11 and the inner ring 12 until the grinding amount of the other grinding target surface in the width matching control reaches the target grinding amount ΔH. For example, when the end surface 11F of the outer ring 11 is a surface to be ground in the difference width adjustment control, the end surfaces 11F and 12F are changed until the grinding amount (that is, Ho0−Ho1) of the end surface 11F in the width alignment control reaches the target grinding amount ΔH. To be ground. When the end surface 12F of the inner ring 12 is a surface to be ground in the difference width adjustment control, the end surfaces 11F and 12F are ground until the grinding amount (that is, Hi0-Hi1) of the end surface 12F in the width alignment control reaches the target grinding amount ΔH. The Thereby, the width dimension of the outer ring | wheel 11 and the inner ring | wheel 12 is adjusted to the same value, and a flash ground angular contact ball bearing can be manufactured by combining the outer ring | wheel 11 and the inner ring | wheel 12.

The grinding system 100 further includes a cleaning device 30 for cleaning the rotary table 20. Thereby, the chips and abrasive grains on the rotary table 20 can be removed after grinding.

(Modification)
The initial value h and the target value L of the difference width HB are negative (−) when the end surface 12B of the inner ring 12 protrudes to the back side from the end surface 11B of the outer ring 11, and are positive (−) otherwise. May be measured as follows. In this case, the control device 7 may determine the end surface 11B of the outer ring 11 and the end surface 12F of the inner ring 12 as the surfaces to be ground when h> L. The controller 7 may determine the end surface 11F of the outer ring 11 and the end surface 12B of the inner ring 12 as the surfaces to be ground when h <L.

The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

1. Surface grinding machine, 2. Feeding conveyor, 3. Stopper, 4. Temporary placing table, 5. Discharging conveyor, 6. Transfer robot, 7. Control device, 10. Angular contact ball bearing, 11. Outer ring, 11.B, 11F, 12B, 12F. End face, 12. Inner ring. , 13 rolling elements, 14 cage, 20 rotary table, 21 slide table, 22 upper surface, 27 bed, 30 cleaning device, 31 wiper, 40 dimension measuring instrument, 41, 42 terminal unit, 50 grindstone unit, 55 slide member, 56 Rotating shaft, 57 grinding wheel, 58 support, 59 motor, 70 dresser, 100 grinding system, W workpiece.

Claims

A grinding system for grinding an outer ring and an inner ring of an angular ball bearing,
A first ground surface and a second end surface of the inner ring placed on the table, and a surface to be ground upward of the first end surface and the second end surface of the outer ring placed on the table A surface grinding machine for grinding an upward grinding target surface,
A transport device for transporting the outer ring and the inner ring onto the table;
A control device that executes a first control for adjusting a difference width between the first end surface of the outer ring and the first end surface of the inner ring when the angular ball bearing is manufactured by combining the outer ring and the inner ring. And
In the first control, the control device controls the conveying device when the comparison result between the initial value of the difference width and the target value satisfies the first condition, and the second end surface is the surface to be ground. When the outer ring is placed on the table so that the first end face is the surface to be ground, the inner ring is placed on the table, and the comparison result satisfies the second condition. In addition, the outer ring is placed on the table so that the first end surface becomes the surface to be ground by controlling the conveying device, and the inner ring so that the second end surface becomes the surface to be ground. Placed on the table,
The first condition is a condition in which the initial value is larger than the target value when the difference width is a positive value when the first end surface of the inner ring protrudes from the first end surface of the outer ring. Yes, when the difference width is a negative value when the first end surface of the inner ring protrudes from the first end surface of the outer ring, the initial value is a condition that is smaller than the target value,
The second condition is a condition in which the initial value is smaller than the target value when the difference width when the first end surface of the inner ring protrudes from the first end surface of the outer ring is a positive value. Yes, when the difference width is a negative value when the first end surface of the inner ring protrudes from the first end surface of the outer ring, the initial value is a condition that is larger than the target value,
In the first control, the control device is configured such that one of the grinding target surfaces, which is the first end surface among the grinding target surface of the outer ring and the grinding target surface of the inner ring, has the initial value and the target value. A grinding system for controlling the surface grinding machine to grind the grinding target surfaces of the outer ring and the inner ring until the difference thickness is ground.
In the first control, a grinding amount of the other grinding target surface which is the second end face among the grinding target surface of the outer ring and the grinding target surface of the inner ring is less than a target grinding amount in the first control. In this case, the surface grinder and the transfer device are controlled to execute a second control for adjusting the width between the outer ring and the inner ring,
In the second control, the control device controls the conveying device to place the outer ring on the table so that the second end surface becomes the surface to be ground, and the second end surface is Place the inner ring on the table so as to be the surface to be ground,
The control device controls the surface grinder to grind the grinding target surfaces of the outer ring and the inner ring until the grinding amount of the other grinding target surface in the second control reaches the target grinding amount. The grinding system according to claim 1.
The grinding system according to claim 1 or 2, further comprising a cleaning device for cleaning the table.
A grinding method using a surface grinder for grinding an outer ring and an inner ring of an angular ball bearing,
The surface grinding machine has a table, and an upper grinding target surface of the first end surface and the second end surface of the outer ring placed on the table, and a first of the inner ring placed on the table. Grinding the upward grinding target surface out of the first end surface and the second end surface,
The grinding method is:
The comparison result between the initial value and the target value of the difference width between the first end surface of the outer ring and the first end surface of the inner ring when the angular ball bearing is manufactured by combining the outer ring and the inner ring is first. When the condition is satisfied, the outer ring is placed on the table so that the second end surface becomes the surface to be ground, and the inner ring is placed on the table so that the first end surface becomes the surface to be ground. When the comparison result satisfies the second condition, the outer ring is placed on the table so that the first end surface becomes the grinding target surface, and the second end surface is the grinding target. A step of placing the inner ring on the table so as to be a surface,
The first condition is a condition in which the initial value is larger than the target value when the difference width is a positive value when the first end surface of the inner ring protrudes from the first end surface of the outer ring. Yes, when the difference width is a negative value when the first end surface of the inner ring protrudes from the first end surface of the outer ring, the initial value is a condition that is smaller than the target value,
The second condition is a condition in which the initial value is smaller than the target value when the difference width is a positive value when the first end surface of the inner ring protrudes from the first end surface of the outer ring. Yes, when the difference width is a negative value when the first end surface of the inner ring protrudes from the first end surface of the outer ring, the initial value is a condition that is larger than the target value,
The grinding method further includes:
Of the outer ring and the inner ring, the surface grinding is performed until one of the grinding target surfaces whose first end surface is the grinding target surface is ground by the thickness of the difference between the initial value of the difference width and the target value. A grinding method comprising a step of grinding the surface to be ground of the outer ring and the inner ring using a disc.