JP6971168B2 - Grinding system and grinding method - Google Patents

Description

The present invention relates to a grinding system and a grinding method for outer and inner rings of angular contact ball bearings.

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

For example, Japanese Patent Application Laid-Open No. 2016-16487 (Patent Document 1) describes a method for adjusting the difference width between the first outer ring end surface on one side in the axial direction of the outer ring and the first inner ring end surface on one side in the axial direction of the inner ring. Is disclosed. Specifically, the second inner ring end face and the first outer ring end face on the opposite side of the first inner ring end face are positioned on the reference plane, and the second outer ring end face and the first inner ring end face on the opposite side of 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 processing amount. The difference width processing amount is obtained by comparing the difference width measured in advance with the target difference width.

Japanese Unexamined Patent Publication No. 2016-16487

In the method described in JP-A-2016-16487, the second outer ring end face and the first inner ring end face are ground. This is premised on the case where the difference width between the first outer ring end surface and the first inner ring end surface approaches the target difference width by grinding the first inner ring end surface. However, there are various combinations of the inner ring and the outer ring constituting the angular contact ball bearing. By grinding the end surface of the first inner ring, there may be a combination in which the difference width between the end surface of the first outer ring and the end surface of the first inner ring is separated from the target difference width. Therefore, the method described in Japanese Patent Application Laid-Open No. 2016-16487 cannot cope with various combinations of the inner ring and the outer ring.

The present invention has been made to solve the above problems, and an object thereof is to be able to cope with various combinations of an inner ring and an outer ring in an angular contact ball bearing, and the difference width between the end faces of the inner ring and the outer ring. Is to provide a grinding system and a grinding method that can be adjusted.

The grinding system for grinding the outer ring and the inner ring of the angular contact ball bearings of the present disclosure has a table, and the surface to be ground upward among the first end face and the second end face of the outer ring mounted on the table and on the table. Angular by combining a surface grinding machine that grinds the first end surface and the second end surface of the mounted inner ring to be ground upward, a transfer device that conveys the outer ring and the inner ring onto the table, and the outer ring and the inner ring. A control device for executing the first control for adjusting the 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 is provided. In the first control, the control device controls the transport device when the comparison result between the initial value of the difference width and the target value satisfies the first condition, and controls the outer ring so that the second end surface becomes the surface to be ground. It is placed on a table, the inner ring is placed on the table so that the first end surface becomes the surface to be ground, and when the comparison result satisfies the second condition, the transport device is controlled 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 target surface for grinding. The first condition is that 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 set to a negative value when protruding from the first end surface of the outer ring, it is a condition that the initial value is smaller than the target value. The second condition is that 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, and the first end surface of the inner ring is When the difference width is set to a negative value when protruding from the first end surface of the outer ring, it is a condition that the initial value is larger than the target value. In the first control, the control device is flat until one of the grinding target surfaces of the outer ring and the grinding target surface of the inner ring, which is the first end surface, is ground by the thickness of the difference between the initial value and the target value. The grinding machine is controlled to grind the surface to be ground on the outer ring and the inner ring.

Preferably, the control device grinds the surface when the grinding amount of the other grinding target surface, which is the second end surface of the grinding target surface of the outer ring and the grinding target surface of the inner ring, is less than the target grinding amount in the first control. The panel and the transfer device are controlled to execute the second control for adjusting the width between the outer ring and the inner ring. In the second control, the control device controls the transport 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 placed on the table so that the second end surface is the surface to be ground. Place it on top. The control device controls the surface grinding machine 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 comprises a cleaning device for cleaning the table top.
The grinding method of the present disclosure is a grinding method using a surface grinding machine for grinding the outer ring and the inner ring of angular contact ball bearings. The surface grinding machine has a table, and of the first end face and the second end face of the outer ring placed on the table, the upward grinding target surface, and the first end face and the second end face of the inner ring placed on the table. Of the end faces, the surface to be ground upward is ground. In the grinding method, the first condition is satisfied by 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 contact ball bearing is manufactured by combining the outer ring and the inner ring. In this case, the outer ring is placed on the table so that the second end surface is the surface to be ground, and the inner ring is placed on the table so that the first end surface is the surface to be ground, and the comparison result is the second condition. When the above conditions are satisfied, the outer ring is placed on the table so that the first end surface is the surface to be ground, and the inner ring is placed on the table so that the second end surface is the surface to be ground. The first condition is that 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 set to a negative value when protruding from the first end surface of the outer ring, it is a condition that the initial value is smaller than the target value. The second condition is that 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 set to a negative value when protruding from the first end surface of the outer ring, it is a condition that the initial value is larger than the target value. As a grinding method, a surface grinding machine is further used until one of the outer ring and the inner ring whose first end surface 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. A step of grinding the surface to be ground of the outer ring and the inner ring is provided.

According to the grinding system and the grinding method of the present disclosure, various combinations of the inner ring and the outer ring in the angular contact ball bearing can be supported, 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 contact ball bearing which is the object of grinding 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. FIG. 3 is a perspective view schematically showing the configuration of the surface grinding machine shown in FIG. 2. It is a side view which shows the rotary table shown in FIG. 3 and the support mechanism thereof. It is a figure which shows the structure of the grindstone unit shown in FIG. 2 schematically. It is sectional drawing which shows the outer ring and the inner ring placed on the rotary table when h> L. It is sectional drawing which shows the outer ring and the inner ring placed on the rotary table when h <L. It is sectional drawing which shows the outer ring and the inner ring placed on the rotary table in the width adjustment control. It is a flowchart which shows an example of the process flow in a grinding system. It is a figure which shows the machining 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 will be given the same reference number, and the explanation will not be repeated. In addition, the embodiments and modifications described below may be selectively combined as appropriate.

(Angular contact ball bearing)
FIG. 1 is a cross-sectional view showing an example of an angular contact ball bearing to be ground in the grinding system according to the embodiment. As shown in FIG. 1, the angular contact ball bearing 10 includes an outer ring 11 and an inner ring 12 constituting a pair of raceway rings, a plurality of rolling elements 13, and a cage 14. The straight line (one-dot chain 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 the contact angle with respect to the radial direction. As a result, the angular contact ball bearing 10 can be loaded with both an axial load and a radial load. When a radial load acts on the angular contact ball bearing 10, a component force is generated in the axial direction. Therefore, two angular contact ball bearings 10 are usually arranged and used in the axial direction.

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

(Grinding system)
FIG. 2 is a plan view showing an example of the 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 storage 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 end surface 11B on the back surface side of the outer ring 11 and the end surface 12B on the back surface side 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, 12F are ground so as to be. 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 work W including the outer ring 11 and the inner ring 12. A swivel stopper 3 is installed at the downstream end of the upper surface of the loading conveyor 2. The work W is conveyed by the loading conveyor 2 until it comes into contact with the stopper 3. The work W is conveyed by the loading conveyor 2 with the end faces 11B and 12B facing upward and the inner ring 12 arranged inside the outer ring 11.

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

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

The discharge conveyor 5 conveys the work W ground by the surface grinding machine 1 to the next process. The surface grinding machine 1 grinds the end faces 11B, 11F, 12B, 12F of the work 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 instrument 40, a grindstone unit 50, and a dresser 70.

The rotary table 20 is a table that rotates in the R direction in the drawing by driving a motor (not shown). The 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 either the end surface 11B or the end surface 11F faces upward. Similarly, the inner ring 12 (see FIG. 1) is placed on the rotary table 20 so that either the end surface 12B or the end surface 12F faces upward. The inner ring 12 is arranged inside the outer ring 11. The rotary table 20 includes a magnet chuck for attracting the mounted work W.

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 spindle (not shown). The rotary table 20 rotates with respect to the slide table 21 due to the rotation of the spindle by a motor (not shown). The slide table 21 is slidably arranged on the upper surface 22 of the bed 27. The slide table 21 and the rotary table 20 move along the X direction.

Returning to FIG. 3, the cleaning device 30 includes the wiper 31 and cleans the rotary table 20 by swirling the wiper 31 on the rotary table 20. As a result, 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 tip of the terminal portions 41 and 42 from the upper surface of the rotary table 20. The dimension measuring instrument 40 brings the tip of the terminal portion 41 into contact with the upward end surface of the outer ring 11, and measures the width dimension Ho 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 the machining by the grindstone unit 50 is set to Ho0. The value (measured value) of the width dimension Ho of the outer ring 11 measured by the dimension measuring instrument 40 during or after machining by the grindstone unit 50 is defined as Ho1. The dimension measuring instrument 40 brings the tip of the terminal portion 42 into contact with the upward end surface of the inner ring 12, and measures the width dimension Hi 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 the machining by the grindstone unit 50 is set to 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 machining by the grindstone unit 50 is defined as Hi1.

The dimension measuring instrument 40 constantly measures the position of the upper surface of the rotary table 20 by a displacement sensor (not shown), and measures the width dimensions Ho and Hi based on the measured position. As a result, even if the rotary table 20 is moved due to thermal displacement of the spindle 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 face of the work 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 rotating shaft 56, a grindstone wheel 57, a support 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 (vertical direction). A motor 59, a rotating shaft 56, and a grindstone 57 are attached to the slide member 55. When the slide member 55 slides, the motor 59, the rotating shaft 56, and the grindstone 57 also slide in the Z direction (vertical 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 grindstone 57 is attached to the other end of the rotating shaft 56. As a result, the grindstone 57 is rotated by the driving force of the motor 59.

The rotation axis 56 is parallel to the X direction. As described above, the rotary table 20 is movable in the X direction. By moving the rotary table 20 in the X direction and bringing the grindstone 57 into contact with the upward end faces of the outer ring 11 and the inner ring 12, the end faces are traversed and ground.

Returning to FIG. 3, the dresser 70 is installed below the grindstone unit 50 and dresses the surface of the grindstone 57 (see FIG. 5) of the grindstone unit 50. Dressing of the grindstone 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 (none of which are shown), and controls a surface grinding machine 1, a transfer robot 6, a feeding conveyor 2, and a discharging conveyor 5. .. The surface grinding machine 1, the transfer robot 6, the feeding conveyor 2 and the discharging conveyor 5 are controlled by the CPU executing the program stored in the storage device. The control device 7 executes control for adjusting the difference width HB (difference width adjustment control) and control for matching the width dimensions of the outer ring 11 and the inner ring 12 (width adjustment control).

(Difference width adjustment control)
The control device 7 determines the target grinding amount Δh (replacement: thickness to be ground) in the difference width adjustment control based on the initial value h and the target value L of the difference width HB measured in advance for each work W. .. 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 toward the back side rather than the end surface 11B of the outer ring 11, and negative (-) otherwise. It is measured so as to be. 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 whether the end surface 11B or the end surface 11F of the outer ring 11 is the surface to be ground, and the end surface 12B and the end surface 12F of the inner ring 12 are used. It is decided which of the above is the surface 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 grinding target surfaces. When h <L, the difference width HB approaches the target value L by grinding the end face 11B of the outer ring 11 without grinding the end face 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 grinding target surfaces.

The control device 7 instructs the transfer robot 6 so that the end surface determined as the surface to be ground faces faces upward. The transfer robot 6 temporarily places the outer ring 11 and the inner ring 12 of the work W to be ground on the temporary placement table 4 so that the designated end face faces upward. After that, the transfer robot 6 transfers the work W to be ground from the temporary stand 4 onto the rotary table 20 of the surface grinding machine 1 at the timing when the grinding of the previous work W is completed.

When the work 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 work W is located below the grindstone 57 (see FIG. 5). Move the rotary table 20. Further, the control device 7 controls the grindstone unit 50 to rotate the grindstone 57 while moving the grindstone 57 downward along the Z direction, and grinds the upward end surface of the work W. At this time, the control device 7 moves and rotates the rotary table 20 in the X direction to traverse grind the work W.

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

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 device 40 (see FIG. 3) while grinding the work W. When h> L, the control device 7 holds 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. It is ground by a grindstone 57. When h <L, the control device 7 holds 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. It is ground by a grindstone 57. As a result, the difference width HB is adjusted to the target value L.

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

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

The control device 7 executes width adjustment control when the grinding amount of the outer ring 11 or the inner ring 12 arranged so that the end face on the front side faces upward in the difference width adjustment control is less than the target grinding amount ΔH. That is, when h> L, the control device 7 has the measured value Ho1 and the initial value of the width dimension Ho after the difference width adjustment control of the outer ring 11 placed so that the end face 11F faces upward in the difference width adjustment control. Width adjustment control is executed when Ho0 and Ho1> Ho0−ΔH are satisfied. When h <L, the control device 7 has a measured value Hi1 and an 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 adjustment control is executed when Hi1> Hi0−ΔH is satisfied. Further, the control device 7 executes the width adjustment 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 transfers the work W (outer ring 11 and inner ring 12) onto the rotary table 20 of the surface grinding machine 1 after temporarily placing the work W (outer ring 11 and inner ring 12) on the temporary placement table 4 so that the designated end face faces upward. .. When the work W is conveyed onto the rotary table 20 of the surface grinding machine 1, the surface grinding machine 1 is controlled to move the rotary table 20 so that the work W is located below the grindstone 57 (see FIG. 5). Let me. Further, the control device 7 controls the grindstone unit 50 to rotate the grindstone 57 while moving the grindstone 57 downward along the Z direction, and grinds the upward end surface of the work W. At this time, the control device 7 moves and rotates the rotary table 20 in the X direction to traverse grind the work W.

FIG. 8 is a cross-sectional view showing an outer ring 11 and an inner ring 12 placed on the rotary table 20 in the width adjustment 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 surface 11F on the front side of the outer ring 11 and the end surface 12F on the front side of the inner ring 12 face upward, and the end surface 11F. , 12F is ground by the grindstone 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 device 40 (see FIG. 3) while grinding the work W. When h> L, the control device 7 sets Ho1 = Ho0-ΔH between the initial value Ho0 and the measured value Ho1 of the width dimension Ho of the outer ring 11 in which the front end surface 11F is arranged upward even in the difference width adjustment control. The end faces 11F and 12F are ground by the grindstone 57 until they are filled. That is, the end faces 11F and 12F are ground by the grindstone 57 until the grinding amount (Ho0-Ho1) of the end face 11F of the outer ring 11 in the width adjustment control reaches the target grinding amount ΔH. When h <L, the control device 7 sets Hi1 = Hi0-ΔH between the initial value Hi0 and the measured value Hi1 of the width dimension Hi of the inner ring 12 in which the end surface 12F on the front side is arranged upward even in the difference width adjustment control. The end faces 11F and 12F are simultaneously ground by the grindstone 57 until they are satisfied. That is, the end faces 11F and 12F are ground by the grindstone 57 until the grinding amount (Hi0-Hi1) of the end face 12F of the inner ring 12 in the width adjustment control reaches the target grinding amount ΔH.

When h = L, the control device 7 grinds the end faces 11F and 12F by the grindstone 57 until the measured value of the width dimension of the outer ring 11 and the inner ring 12 having the smaller initial value of the width dimension changes by ΔH. Let me. 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 waits until the initial value Ho0 and the measured value Ho1 satisfy Ho1 = Ho0−ΔH. , The end faces 11F and 12F are ground by the grindstone 57. When the initial value Hi0 of the width dimension Hi of the inner ring 12 is smaller than the initial value Ho0 of the width dimension Ho of the outer ring 11, the control device 7 has an end face 11F until the initial value Hi0 and the measured value Hi1 satisfy Hi1 = Hi0-ΔH. , 12F are simultaneously ground by the grindstone 57.

By 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 surface side satisfies the target value L. Therefore, by combining the outer ring 11 and the inner ring 12, a flash ground angular contact ball bearing can be manufactured.

(Processing flow of grinding system)
FIG. 9 is a flowchart showing an example of the processing flow in the grinding system 100. The grinding system 100 executes a series of processes shown in FIG. 9 for each work W. First, in step S1, the control device 7 determines whether or not the initial value h of the difference width HB measured in advance with respect to 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.

When h> L (YES in step S1), in step S3, the transfer robot 6 arranges the outer ring 11 on the rotary table 20 so that the end surface 11F on the front side faces upward, and the end surface 12B on the back side. The inner ring 12 is arranged on the rotary table 20 so that When h <L (YES in step S2), in step S4, the transfer robot 6 arranges the outer ring 11 on the rotary table 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 rotary table 20 so that In steps S3 and S4, the transfer robot 6 transfers the inner ring 12 and the outer ring 11 onto the rotary table 20 in this order. Further, 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 grinding machine 1 performs differential width adjusting grinding in step S5. That is, the surface grinding machine 1 grinds the outer ring 11 and the inner ring 12 upward until the ring (outer ring 11 or inner ring 12) arranged so that the end face 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 surface 12B of the inner ring 12 is arranged upward, the surface grinding machine 1 uses the end surface 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 arranged upward, the surface grinding machine 1 performs 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 with 12F.

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

If YES in step S6, in step S7, the transfer robot 6 arranges the outer ring 11 and the inner ring 12 on the rotary table 20 of the surface grinding machine 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 difference width adjusting grinding is unnecessary.

Next, in step S8, the surface grinding machine 1 executes width adjustment grinding. Specifically, in the surface grinding machine 1, when the outer ring 11 is arranged so that the end face 11F faces upward in the difference width adjusting grinding, the difference between the initial value Ho0 and the measured value Ho1 of the width dimension of the outer ring 11 is Ho0-. The end faces 11F and 12F are ground until Ho1 reaches the target grinding amount ΔH. Even when the surface grinding machine 1 has not executed the difference width adjusting 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 grinding machine 1, when the inner ring 12 is arranged so that the end face 12F faces upward in the difference width adjusting grinding, the difference Hi0-Hi1 between the initial value Hi0 and the measured value Hi1 of the width dimension of the inner ring 12 is the target grinding amount. Grind the end faces 11F and 12F until ΔH. Even when the surface grinding machine 1 has not executed the difference width adjusting grinding and 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 difference Hi0-Hi1 is the target grinding. The end faces 11F and 12F are ground until the amount ΔH is reached.

Next, in step S9, the magnet chuck of the rotary table 20 is turned off, and the transfer robot 6 conveys the outer ring 11 and the inner ring 12 on the rotary table 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 turns the wiper 31 to clean the rotary table 20. As a result, the processing for one work W by the grinding system 100 is completed.

FIG. 10 is a diagram showing a machining pattern in the grinding system 100. The processing pattern A is a pattern when YES in step S1 and NO in step S6. In the machining pattern A, in the differential width adjusting grinding, the end face 12B on the back surface side of the inner ring 12 is ground by the target grinding amount Δh, and the width adjustment grinding is not executed. The processing pattern B is a pattern when YES in step S1 and YES in step S6. In the machining pattern B, in the differential width adjusting grinding, the end face 12B on the back surface side of the inner ring 12 is ground by the target grinding amount Δh, and the width adjustment grinding is executed. The processing pattern C is a pattern when YES in step S2 and NO in step S6. In the machining pattern C, in the differential width adjusting grinding, the end face 11B on the back surface side of the outer ring 11 is ground by the target grinding amount Δh, and the width adjustment grinding is not executed. The processing pattern D is a pattern when YES in step S2 and YES in step S6. In the machining pattern D, the end face 11B on the back surface side of the outer ring 11 is ground by the target grinding amount Δh in the differential width adjusting grinding, and the width adjustment grinding is executed. The processing pattern E is a pattern when NO in step S2. In the machining pattern E, the differential width adjustment grinding is not executed, and the width adjustment 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 storage table 4 in this order by the transfer robot 6. At this time, it is preferable that the cleaning device 30 swirls the wiper 31 to clean the rotary table 20. Further, it is preferable to clean the outer ring 11 and the inner ring 12 by using an air nozzle or a cleaner (not shown).

Prior to step S1, the cleaning device 30 may rotate the wiper 31 to clean the rotary table 20.

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

(advantage)
As described above, in the difference width adjustment control (first control), the control device 7 determines that the comparison result between the initial value h of the difference width HB and the target value L satisfies h> L (first condition). The transfer robot (conveyor) 6 is controlled so that the outer ring 11 is placed on the rotary table 20 so that the end surface (second end surface) 11F becomes the grinding target surface, and the end surface (first end surface) 12B is the grinding target surface. The inner ring 12 is placed on the rotary table 20 so as to be. When the comparison result satisfies h <L (second condition), the control device 7 controls the transfer robot 6 to rotate the outer ring 11 so that the end face (first end face) 11B becomes the grinding target surface. The inner ring 12 is placed on the rotary table 20 so that the end face (second end face) 12F is the surface to be ground. Further, in the control device 7, in the difference width adjustment control, one of the grinding target surfaces of the outer ring 11 and the grinding target surface of the inner ring 12 which is the end surface on the back side is ground by the thickness of the target grinding amount Δh. Until then, the surface grinding machine 1 is controlled to grind the surface to be ground 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 of the grinding target surfaces, which is the end surface on the back surface side, is ground by the thickness of the target grinding amount Δh. Thereby, regardless of the combination of the outer ring 11 and the inner ring 12, the difference width HB between the end surface 11B and the end surface 12B on the back surface side can be automatically adjusted to the target value L.

Further, the operator does not adjust the difference width HB while visually confirming the contact between the grindstone 57 and the work W. The surface to be ground is ground while measuring the amount of grinding of the surface to be ground using the dimension measuring device 40. Therefore, it is possible to suppress variations in the difference width HB depending on the operator.

Further, in the control device 7, the grinding amount of the grinding target surface of the outer ring 11 and the grinding target surface of the inner ring 12 which is the end surface on the front side in the difference width adjustment control is less than the target grinding amount ΔH. In this case, the surface grinding machine 1 and the transfer robot 6 are controlled to execute the width adjustment control for matching the width dimensions of the outer ring 11 and the inner ring 12. The control device 7 controls the transfer robot 6 in the width adjustment control 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 grinding machine 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 adjustment control reaches the target grinding amount ΔH. For example, when the end face 11F of the outer ring 11 is the surface to be ground in the difference width adjustment control, the end faces 11F and 12F have the end faces 11F and 12F until the grinding amount (that is, Ho0-Ho1) of the end face 11F in the width adjustment control reaches the target grinding amount ΔH. Be ground. When the end face 12F of the inner ring 12 is the surface to be ground in the difference width adjustment control, the end faces 11F and 12F are ground until the grinding amount (that is, Hi0-Hi1) of the end face 12F in the width adjustment control reaches the target grinding amount ΔH. NS. As a result, the width dimensions of the outer ring 11 and the inner ring 12 are adjusted to the same value, and by combining the outer ring 11 and the inner ring 12, a flash ground angular contact ball bearing can be manufactured.

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

(Modification example)
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 toward the back surface side from the end surface 11B of the outer ring 11, and positive (-) otherwise. It may be measured as follows. In this case, when h> L, 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 grinding target surfaces. When h <L, the control device 7 may determine the end surface 11F of the outer ring 11 and the end surface 12B of the inner ring 12 as the grinding target surfaces.

The embodiments disclosed this time should be considered to be exemplary and not restrictive in all respects. The scope of the present invention is shown by the scope of claims rather than the description of the embodiments described above, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

1 Surface grindstone, 2 Input conveyor, 3 Stopper, 4 Temporary stand, 5 Discharge conveyor, 6 Transfer robot, 7 Control device, 10 Angular contact ball bearings, 11 Outer ring, 11B, 11F, 12B, 12F End face, 12 Inner ring , 13 rolling elements, 14 cages, 20 rotary tables, 21 slide tables, 22 top surfaces, 27 beds, 30 cleaning devices, 31 wipers, 40 dimension measuring instruments, 41, 42 terminals, 50 grindstone units, 55 slide members, 56. Rotating shaft, 57 grindstone, 58 support, 59 motor, 70 dresser, 100 grinding system, W work.

Claims (3)

A grinding system that grinds the outer and inner rings of angular contact ball bearings.
Having a table, an upward grinding target surface of the first end face and the second end face of the outer ring placed on the table, and the first end face and the second end face of the inner ring placed on the table. A surface grinding machine that grinds the surface to be ground upward,
A transport device for transporting the outer ring and the inner ring onto the table,
A control device that executes first control for adjusting the difference width between the first end surface of the outer ring and the first end surface of the inner ring when the outer ring and the inner ring are combined to manufacture the angular contact ball bearing. And with
In the first control, the control device controls the transport 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 and the inner ring is placed on the table so that the first end surface becomes the surface to be ground, 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 grinding target surface, and the inner ring is placed on the table so that the second end surface becomes the grinding target surface. On the table
The first condition is that 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. If 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 smaller than the target value.
The second condition is that 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. If 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 larger than the target value.
In the first control, in the first control, the grinding target surface which is the first end surface of 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. The surface grinding machine is controlled to grind the outer ring and the inner ring to be ground until the difference thickness is ground .
In the control device, the grinding amount of the grinding target surface of the outer ring and the grinding target surface of the inner ring, which is the second end surface, is less than the target grinding amount in the first control. In this case, the surface grinding machine and the transport device are controlled to execute the second control for adjusting the widths of the outer ring and the inner ring.
In the second control, the control device controls the transport device to place the outer ring on the table so that the second end surface becomes the grinding target surface, and the second end surface is the second end surface. The inner ring is placed on the table so as to be a surface to be ground, and the inner ring is placed on the table.
The control device controls the surface grinding machine to grind the outer ring and the inner ring to be ground until the amount of grinding of the other surface to be ground in the second control reaches the target grinding amount. , Grinding system. The grinding system according to claim 1, further comprising a cleaning device for cleaning the table. A grinding method using a surface grinding machine that grinds the outer and inner rings of angular contact ball bearings.
The surface grinding machine has a table, and has an upward grinding target surface among the first end face and the second end face of the outer ring placed on the table, and the inner ring placed on the table. Grinding the 1st end face and the 2nd end face to be ground upward,
The grinding method is
The first is the result of comparison 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 contact ball bearing is manufactured by combining the outer ring and the inner ring. When the conditions are satisfied, the outer ring is placed on the table so that the second end surface becomes the grinding target surface, and the inner ring is placed on the table so that the first end surface becomes the grinding target surface. 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 is provided.
The first condition is that 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. If 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 smaller than the target value.
The second condition is that 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. If 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 larger than the target value.
The grinding method further comprises
The surface grinding is performed until the outer ring and the inner ring whose first end surface is the surface to be ground and 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. The process of grinding the outer ring and the inner ring to be ground using a board, and
When the grinding amount of the outer ring and the inner ring whose second end surface is the grinding target surface is less than the target grinding amount, the second end surface becomes the grinding target surface. A step of placing the outer ring on the table and placing the inner ring on the table so that the second end surface becomes the surface to be ground.
A grinding method comprising a step of grinding the outer ring and the inner ring to be ground by using the surface grinding machine until the grinding amount of the other surface to be ground reaches the target grinding amount.

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