JP7087840B2 - Grinding method - Google Patents

Description

The present invention relates to a grinding method for grinding a work with a grindstone that has moved to a machining position.

Conventionally, in grinding, the surface of a rotating grindstone is brought into contact with the machined surface of the work, and the machined surface of the work is scraped to form the work into a predetermined shape. For example, the grinding apparatus described in Patent Document 1 is a surface processing apparatus for wafers, in which the amount of wear of the grindstone is measured by a non-contact type wear amount measuring device, and the amount of downward movement of the grindstone is determined according to the amount of wear. I am trying to fix it.

Japanese Unexamined Patent Publication No. 11-309666

By the way, whether or not the work itself is rotated in the grinding process varies depending on the grinding method. However, as in the grinding device described in Patent Document 1, the work is first transported to the machining position and then at a predetermined machining position. It is common to fix and grind in. However, the present inventor has found a method of performing grinding while transporting the work without stopping at the machining position in order to shorten the cycle time.

By the way, in general, in grinding, there is a demand to increase the peripheral speed of the grindstone as much as possible in order to improve the processing capacity. In order to increase the peripheral speed of the grindstone, it is necessary to increase the number of revolutions of the grindstone and the diameter of the grindstone. There is a limit to the capacity of peripheral equipment such as motors to increase the number of rotations of the grindstone, and there has been a demand to increase the diameter of the grindstone as much as possible in order to further improve the machining capacity.

However, in pitch transport in which the work is transported at a predetermined pitch, if the grindstone is lowered straight with respect to the work, the grindstone diameter is larger than the pitch, such as when machining a workpiece with a small shape, for example, machining first. There was a problem that it touched the work in front of the transferred transfer line and hit the pallet of the workpiece transfer. Therefore, the present inventor has developed a method for processing the grindstone by tilting it diagonally to the rear side in the transport direction with respect to the work when performing grinding while transporting.

However, when the grindstone is tilted, the position of the grinding end of the grindstone shifts as the grindstone wears. Since the grindstone is moved up and down at the same transport position in the transport direction for machining, the start and end of the grindstone are misaligned and the part to be ground is not ground, or the grindstone interferes with the workpiece already transported to the machining point while descending. There was a concern that the processing accuracy would deteriorate.

The present invention has been created in view of these points, and an object thereof is to maintain machining accuracy even when the grindstone is worn in a grinding method in which grinding is performed while transporting a work. , To provide a grinding method capable of improving quality.

In the grinding method of the present invention, the transport mechanism unit (10) for transporting the work (W) in the transport direction, the grindstone (20) for grinding the work, and the outer periphery of the grindstone are tilted to the rear side in the transport direction with respect to the work. Controls the rotation mechanism (30) that slides on the workpiece surface of the work in a state, the reciprocating mechanism (40) that reciprocates the grindstone with respect to the work, the transport mechanism, the rotation mechanism, and the reciprocating mechanism. Grinding is performed by a grinding device having a control unit (50).

The grinding method of the present invention includes a transfer step (S1), a total wear amount detection step (S8), and a change step (S2, S21, S22), and the machining position while transporting the work in the transport direction. Grind the work with the grindstone that has moved to. In the transfer process, the work is transferred by the transfer mechanism unit. In the total wear amount detection step, the total wear amount of the grindstone is detected. In the changing process, the control unit synchronously controls the reciprocating operation of the reciprocating mechanism unit so as to correspond to the transfer operation of the work by the transfer mechanism unit, and changes the mode of the reciprocating operation of the grindstone according to the total wear amount. .. Further, each of the following aspects has different features.

(1) In the first aspect, in the changing step, the control unit changes so that the larger the total amount of wear, the earlier the start timing of the forward operation of the grindstone.
(2) In the second aspect, in the changing step, the control unit changes so that the cutting speed of the grindstone increases as the total amount of wear increases.
(3) In the third aspect, in the changing step, the control unit is changed so that the ascending position of the grindstone is lowered as the total amount of wear is larger.
(4) In the fourth aspect, in the changing step, the control unit changes the lowering start timing of the grindstone according to the total amount of wear.
(5) The fifth aspect further includes a machining position determination step (S4) in addition to the above three steps of a transfer step, a total wear amount detection step, and a change step. In the machining position determination step, the control unit detects the total wear amount for each grinding process of any one workpiece, and determines the machining position of the grindstone based on the detected total wear amount.

According to the configuration of the present invention, the reciprocating operation by the reciprocating mechanism unit is synchronously controlled so as to correspond to the transporting operation of the work by the transport mechanism unit. Since the grindstone is in a state where the outer circumference of the grindstone is tilted to the rear side in the transport direction with respect to the work, when the grindstone wears, not only the edge of the grinding end is removed, but also the grinding end rises and is transported. Move to the rear side of the direction.
In the grinding method of the present invention, in the changing process, for example, the lowering start timing of the grindstone, the cutting speed, the ascending position, and the like are appropriately changed according to the total amount of wear of the grindstone. For this reason, in a grinding method in which the grindstone is arranged diagonally and grinding is performed while transporting the work, the cycle time is reduced to improve productivity, and the machining accuracy is maintained even when the grindstone is worn. And the quality can be improved.

It is a schematic diagram which shows the grinding machine which performs a grinding process by the grinding process method according to 1st Embodiment of this invention. It is a figure which shows the relationship between the rotation of a screw shaft, and the vertical movement of a grindstone in a graph in the synchronous control using an electronic cam. It is a figure schematically explaining the machining to which the grinding method of this embodiment is applied, (a) shows the shape of the work before machining, (b) shows the battledore machining, and (c) is chamfering machining. It is a figure which shows. It is a flowchart which a control part executes in a grinding process. It is a figure which shows the correspondence table with the total wear amount and the descent timing deanglement. It is a figure for demonstrating how the tip of a grindstone wears. It is a flowchart which a control part executes in the grinding process by 2nd Embodiment of this invention. It is a flowchart which a control part executes in the grinding process according to 3rd Embodiment of this invention.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
[Constitution]
The configuration of the first embodiment of the present invention will be described with reference to FIGS. 1 to 6. First, the configuration of the grinding apparatus 101 that performs grinding using the grinding method of the first embodiment will be described with reference to FIG. 1. As shown in FIG. 1, the grinding apparatus 101 mainly includes a transport mechanism unit 10, a grindstone 20, a rotation mechanism unit 30, a reciprocating mechanism unit 40, and a control unit 50. In FIG. 1, only the grindstone 20 is shown in cross section in order to make the shape of the grindstone 20 easy to understand.

The transport mechanism unit 10 is a mechanism for transporting the work W in the transport direction indicated by the arrow B, and includes a screw shaft servomotor 11, a work fixing jig 12, a screw shaft 13, and a belt 14. In the present embodiment, the transport mechanism unit 10 transports the work W in the horizontal direction. The screw shaft 13 has a spiral groove 15 cut on the outer periphery thereof, and the protrusion of the work fixing jig 12 is fitted into this groove. The work W is supported by the screw shaft 13 by being clamped to the work fixing jig 12 by a clamp member (not shown). The screw shaft 13 is connected to the screw shaft servomotor 11 via a belt 14, and is rotated by rotational drive of the screw shaft servomotor 11. When the screw shaft 13 makes one rotation, the work W is conveyed by one pitch P in the conveying direction.

The grindstone 20 is a hollow cup-shaped grindstone having an annular cross section. The rotation mechanism portion 30 slides the grindstone 20 on the workpiece surface of the work W in a state of being tilted with respect to the work W. The rotation mechanism unit 30 has a rotation servomotor 31 and a spindle 32. The grindstone 20 can rotate at high speed via the spindle 32 by driving the rotation servomotor 31. The inclination angle α of the grindstone 20 with respect to the transport surface (horizontal plane in the present embodiment) is about 1 to 5 degrees, and is set to about 2 degrees in the present embodiment. The grindstone 20 and the rotation mechanism portion 30 are tilted so that the rear side in the transport direction faces downward. The angle α can be appropriately set according to the type of processing and the diameter of the grindstone.

The reciprocating mechanism unit 40 is a ball screw mechanism that brings the rotating grindstone 20 close to and separated from the work W, and has a reciprocating servomotor 41, a screw shaft 42, and a nut unit 43. The screw shaft 42 has a spiral thread cut on its outer circumference and extends in a direction perpendicular to the transport direction (vertical direction in this embodiment). A nut unit 43 is screwed to the screw shaft 42, and a spindle 32 is connected to the nut unit 43. The grindstone 20 can reciprocate in a direction approaching and separating from the work W by rotationally driving the reciprocating servomotor 41.

The control unit 50 is composed of a microcomputer centered on a CPU 51, a ROM 52, a RAM 53, a flash memory 54, and the like. The control unit 50 is electrically connected to various sensors including servomotors 11, 31, 41 and sensors (not shown) that measure the height of the work W before and after machining. The flash memory 54 stores various processing conditions (for example, the target lowering amount of the grindstone 20) input from the outside. The control unit 50 controls the mechanism units 10, 30, and 40 in a coordinated manner according to various processing conditions read from the flash memory 54. Further, the control unit 50 determines the wear amount F, the total wear amount TF, the grindstone lowering position D, and the like of the grindstone 20 based on the detection signals from various sensors (for example, the pre-measured value and the post-measured value of the work W). Execute arithmetic processing.

Further, the control unit 50 has an electronic cam control device 60. The electronic cam control device 60 is a device that synchronously controls the transport mechanism unit 10 and the reciprocating mechanism unit 40, and outputs a position where the slave shaft should operate according to the position of the main shaft. The electronic cam control device 60 has a spindle angle input unit 61, a slave axis position command generation unit 62, and an output unit 63. Here, the input shaft is a screw shaft servomotor 11 (encoder signal such as the rotation angle of the screw shaft 13), and the output shaft is a reciprocating servomotor 41. The screw shaft angle is input to the spindle angle input unit 61, and based on this, the screw shaft angle is generated by the slave shaft position command generation unit 62. The screw shaft angle is output to the reciprocating servomotor 41 via the output unit 63.

In this way, the electronic cam control device 60 synchronously controls the rotation angle of the screw shaft 42 so that the grindstone 20 moves relative to the grindstone lowering position D according to the rotation angle of the screw shaft 13. As shown in FIG. 2, the screw shaft 42 rotates in synchronization with the operation of the screw shaft 13, and the grindstone 20 moves up and down according to the rotation angle thereof. In FIG. 2, the horizontal axis indicates the rotation angle of the screw shaft 13. The vertical axis of the graph LS showing the screw operation is the feed rate of the work W by the screw axis 13. The vertical axis of the graph LG showing the grindstone operation shows the vertical position of the grindstone 20. When the rotation angle of the screw shaft 13 is an angle As, the grindstone 20 starts descending.

At the angle Ae, the grindstone 20 reaches the grindstone lowering position D. Grinding is performed between the angles A1 and A2, during which the feed rate by the screw shaft 13 is the slowest, and the grindstone 20 is in the grindstone lowering position D. As shown in the graph, after the grindstone 20 descends to the grindstone lowering position D and is in a standby state, the work W is conveyed to the position of the grindstone 20 and the movement in the conveying direction indicated by the arrow B stops. Grinding is performed without any problems. That is, the work W is ground while being conveyed.

[Grinding control]
Next, the grinding method of the present embodiment will be described with reference to FIGS. 3 to 5. In the grinding method of the present embodiment, for example, as shown in FIG. 3A, a ceramic columnar member is ground into a battledore shape shown in FIG. 3B, or after the battledore processing, FIG. 3 It is applied when chamfering is performed as shown in (c). In the present embodiment, the grindstone 20 descends to the grindstone lowering position D while rotating, and in a state of waiting at the grindstone lowering position D, the work W is conveyed and ground while being conveyed.

This will be described with reference to FIG. FIG. 4 is a flowchart executed by the control unit 50 in the grinding process. First, in step 1 (hereinafter, step is abbreviated as "S"), the screw shaft servomotor 11 is driven to rotate the screw shaft 13, and the work W is conveyed. The process of S1 corresponds to the transfer process. At the same time, the rotary servomotor 31 is driven to rotate the grindstone 20 at high speed. At the same time as the work is conveyed, the reciprocating servomotor 41 is appropriately driven by synchronous control between the screw shaft 13 and the screw shaft 42.

While the work is being conveyed by synchronous control, the lowering start timing (As shown in FIG. 2) of the grindstone 20 is changed in S2 according to the total wear amount TF (i-1) of the grindstone 20. For example, as shown in FIG. 5, a table T in which the reduction angle of the rotation angle of the screw shaft 13 at the start of descent is set according to the value of the total wear amount TF (i-1) is previously set in the control unit 50. Is remembered. The descent start timing is determined based on this table T. The descent start timing corresponds to the "forward movement start timing". The process of S2 corresponds to an example of a "change step" for changing the mode of the reciprocating operation of the grindstone 20.

As shown in FIG. 5, the table T is set so that the larger the value of the total wear amount TF (i-1), the larger the deanglement of the screw shaft 13 at the descent start timing. Assuming that the initial value of the rotation angle is As, if the total wear amount TF (i-1) is 2 mm or more, the angle ahead of As is 0.3 degrees, and the total wear amount TF (i-1) is 4 mm or more. If so, the angle to advance from As is set to 0.6 degrees. If the total wear amount TF (i-1) is 6 mm or more, the angle to advance from As is 0.9 degrees, and if the total wear amount TF (i-1) is 8 mm or more, the angle to advance from As is 1. .Twice.

That is, if the total wear amount TF (i-1) is 3 mm, the reduction angle is 0.3 degrees, so that when the rotation angle of the screw shaft 13 is −0.3 degrees from the angle As, the grindstone 20 is used. The operation timing of the synchronization control is corrected so as to start the descent. That is, when the wear progresses, the descent start timing is advanced.

Next, in S3, pre-measurement for measuring the height of the work Wb (see FIG. 1) before grinding is performed. Next, in S4, the grindstone lowering position D (i) is determined by calculation. The grindstone lowering position D (i) is a position where the grindstone 20 is lowered to the bottom, and corresponds to a “machining position” in which the grindstone 20 is in contact with the work W for grinding. The grindstone lowering position D (i) is obtained by subtracting the target machining amount and the total wear amount TF (i-1) from the previously measured value. The obtained grindstone lowering position D (i) is a height distance with respect to the work installation surface of the work fixing jig 12. The target machining amount corresponds to the grinding amount. S4 corresponds to the “grindstone processing position determination step”. When the grindstone 20 descends to the calculated grindstone lowering position D (i), the grindstone 20 rotating at high speed and the work W being conveyed in the conveying direction come into contact with each other in S5, and grinding is performed.

Next, in S6, post-measurement is performed after measuring the height of the work Wa (see FIG. 1) after processing. Next, in S7, the wear amount F (i) is calculated. The amount of wear F (i) is obtained by subtracting the grindstone lowering position D (i) from the post-measured value. After that, in S8, the total wear amount TF (i) is calculated. The total wear amount TF (i) is obtained by the sum of the current wear amount F (i) calculated in S7 and the total wear amount TF (i-1) up to the previous time. The process of S8 corresponds to the "total wear amount detection step".

Next, in S9, it is determined whether or not the grinding cycle determined by the predetermined number of processed works, time, etc. has been completed, and if it is determined that the grinding cycle has been completed (S9: YES), the work W in S10. And the rotation of the grindstone 20 are stopped, and this control process is completed. On the other hand, when it is determined that the cycle has not ended (S9: NO), the process returns to S2 and the processing for the next work W is continuously performed. The work transfer is continuously executed until the predetermined cycle is completed, and the processes S2 to S8 are continuously executed for the work W to be sequentially transferred.

In FIG. 4, the processes executed for one work W are shown and described in chronological order, but in reality, pre-measurement is performed for any work W on the rear side in the transport direction. Occasionally, a plurality of work Ws are processed simultaneously, such as grinding processing on the work W to be processed and post-measurement on the work W on the front side in the transport direction.

[effect]
As shown in FIG. 6, as the grindstone 20 tilted at an angle is worn, the position of the grinding end portion rises from the position E1 to E2, E3, and E4 in order, and is rearward in the transport direction. Move to. Therefore, if the transfer operation of the work W and the reciprocating operation of the grindstone 20 are synchronously controlled at the same timing, the grindstone 20 may come into contact with the work W that has already been conveyed to the machining point during descent, or a portion to be machined. There is a risk that the machining accuracy will drop because not all grinding is possible.

However, in the present embodiment, in S2, the descent start timing of the grindstone 20 is changed according to the total wear amount TF (i-1) of the grindstone 20. That is, when the wear progresses, the lowering start timing is advanced so that the grindstone 20 is surely lowered to the grindstone lowering position D (i) by the time the work W to be machined is conveyed to the machining position. can.

Referring to FIG. 2 again, when the rotation angle of the screw shaft 13 is the angle Ae, the grindstone 20 is positioned at the predetermined grindstone lowering position D (i). That is, it is possible to reliably maintain the state in which the work W is conveyed while the grindstone 20 is in the grindstone lowering position D (i) in the rotating state and is on standby. Therefore, as described above, it is possible to avoid the problem that a portion that should be ground but is not ground is generated, or the grindstone 20 and the work W are inadvertently interfered with each other and the processing accuracy is lowered.

Further, it is possible to perform grinding while transporting while maintaining the processing accuracy in this way, the cycle time of product processing can be significantly reduced, and the production cost can be reduced.

Further, by arranging the grindstone 20 at an angle, the front side of the grinding surface in the transport direction is raised, and when the grindstone 20 is in the grindstone lowering position D (i), it comes into contact with the work W on the front side in the transport direction. Since it can be avoided, a grindstone 20 having a large grindstone diameter can be adopted. Therefore, the peripheral speed of the grindstone 20 can be increased and the machining capacity can be improved.

In the first embodiment, the electronic cam control device 60 executes synchronous control between the transport mechanism unit 10 and the reciprocating mechanism unit 40. Therefore, the grinding process can be suitably performed by the grinding device 101, which is miniaturized, easy to maintain as compared with the mechanical structure, and has high functionality.

<Second embodiment>
Next, the grinding method of the second embodiment of the present invention will be described with reference to FIG. 7. The grinding apparatus 101 is the same as that of the first embodiment. The second embodiment is different from the first embodiment in that S21 is executed instead of S2 shown in FIG. Since other processes are the same as those in the first embodiment, the same step numbers are assigned and the description thereof will be omitted.

As shown in FIG. 7, in the second embodiment, in S21, the cutting speed of the grindstone 20 is changed according to the total wear amount TF (i-1) of the grindstone 20. For example, as the total wear amount TF (i-1) increases, the cutting speed is changed to be faster. The cutting speed can be changed by adjusting the rotation speed of the reciprocating servomotor 41. The process of S21 corresponds to an example of a "change step" for changing the mode of the reciprocating operation of the grindstone 20.

As the grindstone 20 wears, as shown in S4, the set grindstone lowering position D (i) is lowered, so that the descent distance becomes longer. In S21, by increasing the cutting speed of the grindstone 20 according to the total wear amount TF (i-1) of the grindstone 20, even if the descent distance becomes long, the time required for descent can be prevented from increasing, and processing can be performed. The positional relationship between the grindstone 20 and the work W at the point can be appropriately maintained. According to the present embodiment, the same effect as that of the first embodiment can be obtained.

<Third Embodiment>
Next, the grinding method according to the third embodiment of the present invention will be described with reference to FIG. The grinding apparatus 101 is the same as that of the first embodiment. The third embodiment is different from the second embodiment in that S22 is executed instead of S21 shown in FIG. 7. Since other processes are the same as those in the second embodiment, the same step numbers are assigned and the description thereof will be omitted.

As shown in FIG. 8, in the third embodiment, in S22, the ascending position of the grindstone 20 after the grinding process is changed according to the total wear amount TF (i-1) of the grindstone 20. For example, as the total wear amount TF (i-1) increases, the ascending position is changed to be lower. The process of S22 corresponds to an example of a "change step" for changing the mode of the reciprocating operation of the grindstone 20.

As the grindstone 20 wears, as shown in S4, the set grindstone lowering position D (i) is lowered, so that the descent distance becomes longer. Therefore, by changing the ascending position, which is the returning position of the grindstone 20, to a position lower than before, it is possible to prevent the return time to the ascending position and the descending time at the time of processing the next work W from increasing. That is, according to the present embodiment, the same effect as that of the first embodiment can be obtained.

<Other embodiments>
In each of the above embodiments, the rotation mechanism unit 30 is tilted at an angle α, but a spindle tilting mechanism may be provided so that the tilt angle is appropriately variable.

In each of the above embodiments, the grinding method while transporting the work W is not limited to the battledore processing and chamfering processing described above, and may be applied to other grinding processes.

As described in each of the above embodiments, as an example of changing the mode of the reciprocating motion of the grindstone according to the total amount of wear, one of the start timing, the cutting speed, and the ascending position of the reciprocating motion of the grindstone is used as a parameter. Although it has been adopted, the mode may be changed by combining each of these parameters. That is, S2 of the first embodiment, S21 of the second embodiment, and S22 of the third embodiment may be appropriately combined.

In each of the above embodiments, the transport mechanism unit 10 and the reciprocating mechanism unit 40 are synchronously controlled by the electronic cam control device 60, but a mechanical cam may be used instead of the electronic cam. It is sufficient that the transfer of the work W by the transfer mechanism unit 10 and the vertical movement of the grindstone by the reciprocating mechanism unit 40 are synchronized, and the configuration of the transfer mechanism unit 10 is also limited to the pitch transfer including the screw shaft 13. do not have.

The present invention is not limited to the above-described embodiment, and can be implemented in various forms without departing from the spirit of the invention.

10 ・ ・ ・ Transfer mechanism part 20 ・ ・ ・ Grindstone 30 ・ ・ ・ Rotation mechanism part 40 ・ ・ ・ Reciprocating mechanism part 50 ・ ・ ・ Control unit 60 ・ ・ ・ Electronic cam control device 101 ・ ・ ・ Grinding device W ・ ・··work

Claims (7)

The transport mechanism unit (10) that transports the work (W) in the transport direction, the grindstone (20) that grinds the work, and the work in a state where the outer periphery of the grindstone is tilted rearward in the transport direction with respect to the work. Rotation mechanism part (30) that slides on the surface to be machined, reciprocating mechanism part (40) that reciprocates the grindstone with respect to the work, the transport mechanism part, the rotation mechanism part, and the reciprocating mechanism part. This is a grinding method in which grinding is performed by a grinding device having a control unit (50) for controlling the above.
The transfer step (S1) in which the work is conveyed by the transfer mechanism unit, and
The total wear amount detection step (S8) for detecting the total wear amount of the grindstone, and
The control unit synchronously controls the reciprocating operation of the reciprocating mechanism unit so as to correspond to the transporting operation of the work by the transport mechanism unit, and the mode of the reciprocating operation of the grindstone according to the total wear amount. The change process (S2 ) to be changed and
Including
In the change step, the control unit is changed so that the larger the total amount of wear, the earlier the start timing of the forward operation of the grindstone.
A grinding method in which the work is ground by the grindstone that has moved to the machining position while transporting the work in the transport direction. The transport mechanism unit (10) that transports the work (W) in the transport direction, the grindstone (20) that grinds the work, and the work in a state where the outer periphery of the grindstone is tilted rearward in the transport direction with respect to the work. Rotation mechanism part (30) that slides on the surface to be machined, reciprocating mechanism part (40) that reciprocates the grindstone with respect to the work, the transport mechanism part, the rotation mechanism part, and the reciprocating mechanism part. This is a grinding method in which grinding is performed by a grinding device having a control unit (50) for controlling the above.
The transfer step (S1) in which the work is conveyed by the transfer mechanism unit, and
The total wear amount detection step (S8) for detecting the total wear amount of the grindstone, and
The control unit synchronously controls the reciprocating operation of the reciprocating mechanism unit so as to correspond to the transporting operation of the work by the transport mechanism unit, and the mode of the reciprocating operation of the grindstone according to the total wear amount. The change process (S 2 1) to be changed and
Including
In the change step, the control unit is changed so that the cutting speed of the grindstone increases as the total wear amount increases.
A grinding method in which the work is ground by the grindstone that has moved to the machining position while transporting the work in the transport direction. The transport mechanism unit (10) that transports the work (W) in the transport direction, the grindstone (20) that grinds the work, and the work in a state where the outer periphery of the grindstone is tilted rearward in the transport direction with respect to the work. Rotation mechanism part (30) that slides on the surface to be machined, reciprocating mechanism part (40) that reciprocates the grindstone with respect to the work, the transport mechanism part, the rotation mechanism part, and the reciprocating mechanism part. This is a grinding method in which grinding is performed by a grinding device having a control unit (50) for controlling the above.
The transfer step (S1) in which the work is conveyed by the transfer mechanism unit, and
The total wear amount detection step (S8) for detecting the total wear amount of the grindstone, and
The control unit synchronously controls the reciprocating operation of the reciprocating mechanism unit so as to correspond to the transporting operation of the work by the transport mechanism unit, and the mode of the reciprocating operation of the grindstone according to the total wear amount. The change process (S 22) to be changed and
Including
In the change step, the control unit is changed so that the ascending position of the grindstone is lowered as the total wear amount is larger.
A grinding method in which the work is ground by the grindstone that has moved to the machining position while transporting the work in the transport direction. The transport mechanism unit (10) that transports the work (W) in the transport direction, the grindstone (20) that grinds the work, and the work in a state where the outer periphery of the grindstone is tilted rearward in the transport direction with respect to the work. Rotation mechanism part (30) that slides on the surface to be machined, reciprocating mechanism part (40) that reciprocates the grindstone with respect to the work, the transport mechanism part, the rotation mechanism part, and the reciprocating mechanism part. This is a grinding method in which grinding is performed by a grinding device having a control unit (50) for controlling the above.
The transfer step (S1) in which the work is conveyed by the transfer mechanism unit, and
The total wear amount detection step (S8) for detecting the total wear amount of the grindstone, and
The control unit synchronously controls the reciprocating operation of the reciprocating mechanism unit so as to correspond to the transporting operation of the work by the transport mechanism unit, and the mode of the reciprocating operation of the grindstone according to the total wear amount. The change process (S2 ) to be changed and
Including
In the change step, the control unit changes the lowering start timing of the grindstone according to the total amount of wear.
A grinding method in which the work is ground by the grindstone that has moved to the machining position while transporting the work in the transport direction. The transport mechanism unit (10) that transports the work (W) in the transport direction, the grindstone (20) that grinds the work, and the work in a state where the outer periphery of the grindstone is tilted rearward in the transport direction with respect to the work. Rotation mechanism part (30) that slides on the surface to be machined, reciprocating mechanism part (40) that reciprocates the grindstone with respect to the work, the transport mechanism part, the rotation mechanism part, and the reciprocating mechanism part. This is a grinding method in which grinding is performed by a grinding device having a control unit (50) for controlling the above.
The transfer step (S1) in which the work is conveyed by the transfer mechanism unit,
The total wear amount detection step (S8) for detecting the total wear amount of the grindstone, and
The control unit synchronously controls the reciprocating operation of the reciprocating mechanism unit so as to correspond to the transporting operation of the work by the transport mechanism unit, and the mode of the reciprocating operation of the grindstone according to the total wear amount. The change process (S2, S21, S22) to be changed and
The machining position determination step (S4) in which the control unit detects the total wear amount for each grinding process of any one work and determines the machining position of the grindstone based on the detected total wear amount. )When,
A grinding method for grinding the work with the grindstone that has moved to the machining position while transporting the work in the transport direction. The transport mechanism unit is a mechanism for performing pitch transport having a screw shaft (13) that supports the work.
The reciprocating mechanism portion is a ball screw mechanism having a screw shaft (42).
One of claims 1 to 5 , wherein the control unit synchronously controls the rotation angle of the screw shaft so that the grindstone moves relative to the machining position according to the rotation angle of the screw shaft. The grinding method described in the section. 6. The control unit performs synchronous control by electronic cam control using a servomotor (11) that rotationally drives the screw shaft as an input shaft and a servomotor (41) that rotationally drives the screw shaft as an output shaft. The grinding method described in.

Images