JP6938852B2 - Grinder - Google Patents

Description

The present invention relates to a grinding machine.

Patent Document 1 describes a technique of detecting an elastic wave generated in a grindstone when the grindstone comes into contact with a dresser, and determining whether or not the grindstone has come into contact with the dresser based on a measured value corresponding to the detected elastic wave. Is disclosed.

Japanese Unexamined Patent Publication No. 2010-30022

However, the technique described in Patent Document 1 is a technique for positioning the grindstone and the dresser before dressing, and cannot be used for confirming whether or not the dressing is properly performed after the dressing.

An object of the present invention is to provide a grinding machine capable of confirming that truing has been properly performed.

The grinding machine of the present invention includes a spindle that rotatably supports a workpiece, a grindstone that grinds the workpiece, a grindstone that grows the grindstone, and a rough surface of the workpiece or a judgment object that is a contact detection pin. It is provided with a sensor for detecting the force and a control device for controlling the truing of the grindstone. In the control device, the surface roughness of the truing execution unit that executes the truing on the grindstone and the surface roughness of the object to be determined, which is the workpiece or contact detection pin ground immediately after the truing on the grindstone, is a predetermined reference surface roughness. A determination unit for determining whether or not the surface has been reached is provided. When it is determined by the determination unit that the surface roughness of the workpiece or the object to be determined does not reach the reference surface roughness, the truing execution unit re-executes the truing on the grindstone.

According to the grinding machine of the present invention, it is determined whether or not the surface roughness of the workpiece or the object to be determined ground immediately after the grindstone is trued has reached a predetermined reference surface roughness. since re-truing the grinding wheel when it is determined not to have reached, it can be carried out properly trued with respect to the grinding wheel.

It is a top view of the grinding machine in the 1st Embodiment of this invention. It is sectional drawing of the sensor part held in the sensor holding part. It is a block diagram of a control device. It is a graph which shows the change of the surface roughness just before and after the tsuruing. It is a flowchart which shows the truing process which is executed in the truing control part. It is a top view of the grinding machine in the second embodiment. It is a graph which shows the surface roughness of the end face of the contact detection pin which was ground immediately after truing. It is a flowchart which shows the slewing process 2 executed in the slewing process 2 in a control device.

<1. First Embodiment>
(1-1. Schematic configuration of grinding machine 1)
Hereinafter, embodiments of the grinding machine according to the present invention will be described with reference to the drawings. First, the schematic configuration of the grinding machine 1 according to the embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 1, the grinding machine 1 is a table traverse type grinding machine that grinds while rotating a cylindrical workpiece W. The grinding machine 1 includes a bed 2, a table 10, a headstock 20, a tailstock 30, a grindstone 40, a grindstone 50, a turret 60, a coolant supply device 70, a sizing device 80, and the like. It includes an air supply device 90, a sensor 100, and a control device 110.

The bed 2 is a portion that serves as a base for the grinding machine 1. The bed 2 is provided with an operation panel 3 for inputting various parameters related to grinding conditions and the like, and the operation panel 3 is operated by an operator. The table 10 is provided on the bed 2 so as to be movable in the Z-axis direction. The table 10 reciprocates in the Z-axis direction by driving the screw feed device 12 having the Z-axis motor 11.

The headstock 20 is fixed on the table 10. The headstock 20 includes a spindle 21 that rotates around an axis parallel to the Z-axis direction, and a spindle motor 22 that applies a driving force for rotating the spindle 21. The headstock 20 rotatably supports one end of the workpiece W by the spindle 21, and rotationally drives the workpiece W by the spindle motor 22. The tailstock 30 is provided on the table 10 at a position facing the spindle 20 and supports the other end of the workpiece W.

The grindstone stand 40 is provided on the bed 2 so as to be movable in the X-axis direction. The grindstone base 40 reciprocates in the X-axis direction by driving the screw feed mechanism 42 having the X-axis motor 41. The grindstone wheel 50 is rotatably supported about an axis parallel to the Z-axis direction with respect to the grindstone base 40. The grindstone 50 rotates by applying a driving force from the grindstone motor 51 fixed to the grindstone base 40, and grinds the outer peripheral surface of the workpiece W. The Tsurua 60 is rotatably supported with respect to the headstock 20 around an axis parallel to the Z axis. The turret 60 is rotated by a driving force applied from the turret motor 61 provided on the spindle 20, and the grindstone 50 is trued (shaped and sharpened).

The coolant supply device 70 is provided on the bed 2. The coolant supply device 70 supplies coolant to the ground portion via a coolant nozzle (not shown) provided on the grindstone base 40. The sizing device 80 is provided so as to be in contact with the workpiece W on the opposite side of the grindstone 50 sandwiching the table 10. The sizing device 80 measures the outer diameter of the workpiece W ground by the grindstone 50.

The air supply device 90 is provided on the opposite side of the grindstone 50 sandwiching the table 10. The air supply device 90 includes an air blowing portion 91 arranged toward the machining area of the workpiece W, and by blowing air from the air blowing portion 91 to the workpiece W, the coolant adhering to the outer peripheral surface of the workpiece W Remove deposits such as. In the present embodiment, air is blown to the work piece W, but instead of the air, an inert gas or the like that does not affect the processing of the work piece W may be blown.

The sensor 100 is provided so as to be movable in the X-axis direction on the opposite side of the grindstone 50 sandwiching the table 10. The sensor 100 senses the workpiece W after grinding and detects the surface roughness of the workpiece W. Sensing by the sensor 100 is performed in a state where the workpiece W is supported by the spindle 20 and the tailstock 30 after the grinding process for the workpiece W is completed. Therefore, when it is determined that re-truing is necessary as a result of detecting the surface roughness of the work W by the sensor 100, the truing to the grindstone 50 is performed in parallel with the transportation of the work W. Can be done. That is, the grinding process of the workpiece W is performed as compared with the case where the surface roughness of the workpiece W is detected after the workpiece W after machining is transported to another place and the truing is performed again based on the detection result. It is possible to shorten the time from the end to the start of the grinding process of the next workpiece W.

Further, the sensor 100 stands by at a position away from the workpiece W during the grinding process of the workpiece W by the grindstone 50, and approaches the workpiece W when the grinding process is completed. As a result, it is possible to prevent the coolant and the like scattered during the grinding process from adhering to the sensor 100. Further, deposits such as coolant adhering to the outer peripheral surface of the work piece W are removed by blowing air from the air supply device 90 toward the work piece W. Therefore, when the sensor 100 detects the surface roughness of the outer peripheral surface of the workpiece W, the detection accuracy can be improved.

(1-2. Configuration of sensor unit 101)
Next, the configuration of the sensor 100 will be described with reference to FIG. As shown in FIG. 2, the sensor 100 includes a sensor unit 101, a sensor holding unit 102, and a calculation unit 103 (see FIG. 3). The calculation unit 103 may be arranged inside the sensor 100, or may be arranged outside the sensor 100 and connected to the sensor holding unit 102 by a cable or the like.

The sensor unit 101 detects the surface roughness of the workpiece W, which is the object to be measured, in a non-contact manner. The details of the sensor unit 101 will be described later. The sensor holding unit 102 is a portion that holds the sensor unit 101, and is provided on the bed 2 (see FIG. 1) so as to be movable in the X-axis direction. The calculation unit 103 calculates the surface roughness based on the detection result by the sensor unit 101.

Subsequently, the sensor unit 101 will be described. The sensor unit 101 includes a substrate 104, a light emitting element 105, a first light receiving element 106 and a second light receiving element 107, a lid portion 108, and three lenses 108a to 108c.

The substrate 104 is made of a semiconductor material (N-type, P-type, bipolar type, etc.) and is mounted on one surface of the sensor holding portion 102 (the surface facing downward in FIG. 2). The light emitting element 105 is a light emitting diode mounted on the substrate 104, and emits light toward the normal direction (lower direction in FIG. 2) of one surface of the sensor holding portion 102. The first light receiving element 106 and the second light receiving element 107 are photodiodes mounted on the substrate 104, and are arranged in the vicinity of the light emitting element 105. The light emitting element 105, the first light receiving element 106, and the second light receiving element 107 are arranged side by side in a straight line along the longitudinal direction (the left-right direction in FIG. 2) of the sensor holding portion 102, and the light emitting element 105 is the first light receiving element 106. It is arranged between the light receiving element 107 and the second light receiving element 107. The light emitting element 105, the first light receiving element 106, and the second light receiving element 107 arranged on the substrate 104 are partitioned by a partition plate 109. Therefore, it is possible to efficiently perform light emission from the light emitting element 105 and light reception to the first light receiving element 106 and the second light receiving element 107.

Further, in the present embodiment, the case where the light emitting diode is used as the light emitting element 105 has been described as an example, but instead of the light emitting diode, electroluminescence, a laser element, or the like may be used as the light emitting element 105. Further, in the present embodiment, the case where a photodiode is used as the first light receiving element 106 and the second light receiving element 107 has been described as an example, but instead of the photodiode, a CCD, a CMOS element, or the like is used as the first light receiving element 106. And may be used as the second light receiving element 107.

The lid 108 covers the substrate 104, the light emitting element 105, the first light receiving element 106, and the second light receiving element 107. The lid 108 holds one lens 108a to 108c at a position facing each of the light emitting element 105, the first light receiving element 106, and the second light receiving element 107. The three lenses 108a to 108c may be aspherical lenses, and the focal position and depth of focus of the lenses may be adjusted by changing the lens shape for easy detection.

Of the three lenses 108a to 108c, the light emitted from the light emitting element 105 is incident on the lens 108a arranged at a position facing the light emitting element 105. The lens 108a bends the light emitted from the light emitting element 105, and guides the bent light to a specific position P.

Of the three lenses 108a to 108c, the lenses 108b and 108c arranged at positions facing the first light receiving element 106 and the second light receiving element 107 bend the light incident from the specific position P and bend the light. Light is directed to the first light receiving element 106 or the second light receiving element 107.

Here, when light is irradiated from the light emitting element 105, the smaller the surface roughness at the specific position P, the less likely it is that the light is scattered, so that the amount of light detected by the first light receiving element 106 and the second light receiving element 107 becomes large. .. Then, the calculation unit 103 calculates the surface roughness at a specific position P based on the amount of light detected by the first light receiving element 106 and the second light receiving element 107 when the light emitting element 105 irradiates the light. That is, when light is irradiated from the light emitting element 105, if the amount of light detected by the first light receiving element 106 and the second light receiving element 107 is large, the calculation result that the surface roughness is small is shown, and the first light receiving element 106 and If the amount of light detected by the second light receiving element 107 is small, the calculation result that the surface roughness is large is shown.

In reality, the incident light to the specific position P and the reflected light from the specific position have a spread, and the incident angle and the reflected angle have an angular spread. Therefore, the calculation unit 103 determines that the incident angle at the peak position with the strongest intensity in the distribution of the incident light is equal to the reflected angle at the peak position with the highest intensity in the distribution of the reflected light, or the incident light. When the spread distribution of the light and the spread distribution of the reflected light are similar to each other, it is judged that the incident angle and the reflected angle are equal.

In this way, since the sensor unit 101 can detect the surface roughness of the workpiece W in a non-contact manner, it is possible to prevent the workpiece W after grinding from being scratched due to the detection of the surface roughness. .. Further, the sensor unit 101 confirms the change of the reflected light reflected at the specific position P by the two light receiving elements (first light receiving element 106 and the second light receiving element 107) when irradiating from one light emitting element 105. can do. Therefore, the surface roughness of the workpiece W can be measured with high accuracy.

Further, by arranging the light emitting element 105, the first light receiving element 106, and the second light receiving element 107 on one substrate 104, the light emitting element 105, the first light receiving element 106, and the second light receiving element 107 are arranged at positions close to each other. can. Therefore, the size of the sensor unit 101 can be reduced as compared with the case where the light emitting element 105, the first light receiving element 106, and the second light receiving element 107 are formed on separate substrates.

(1-3. About control device 110)
Next, the control device 110 will be described with reference to FIG. As shown in FIG. 3, the control device 110 includes a grinding processing control unit 120 and a trueing control unit 130.

The grinding process control unit 120 controls the grinding process performed on the workpiece W. The grinding control unit 120 can, for example, drive control of various motors (Z-axis motor 11, spindle motor 22, X-axis motor 41, grindstone motor 51), control the amount of coolant supplied from the coolant supply device 70, and set a fixed size. The device 80 manages the diameter of the workpiece W and the like. When the grinding process for one workpiece W is completed, the grinding process control unit 120 notifies the trueing control unit 130 that the grinding process is completed. The grinding process control unit 120 also controls a transfer device (not shown) for transporting the workpiece W.

The truing control unit 130 controls the truing performed on the grindstone 50. The truing control unit 130 includes a truing execution unit 131, a determination unit 132, and a reference surface roughness setting unit 133.

The truing execution unit 131 adjusts the positions of the grindstone 50 and the grindstone 60 (see FIG. 1) by controlling the drive of various motors, and executes the truing of the grindstone 50 by the grindstone 60.

The determination unit 132 determines whether or not the truing is properly executed based on the surface roughness of the workpiece W that is first ground after the truing. When the determination unit 132 determines that the truing is not properly executed, the determination unit 132 instructs the truing execution unit 131 to execute the truing again.

The reference surface roughness setting unit 133 is set with a surface roughness value that serves as a reference when the determination unit 132 determines whether or not the truing is properly executed. The determination unit 132 determines whether the surface roughness of the first workpiece W ground immediately after the truing has reached the reference surface roughness S set in the reference surface roughness setting unit 133.

Here, with reference to FIG. 4, the determination process executed by the determination unit 132 will be described with reference to the graph. In the example shown in FIG. 4, when the number of workpieces W ground after truing reaches a predetermined fixed number, truing is executed.

As shown in FIG. 4, since the grindstone wears as the grinding process is repeated, the surface roughness of the workpiece W ground immediately before the truing becomes larger than that of the workpiece W ground immediately after the truing.

Therefore, when the number of workpieces W ground after the truing reaches a predetermined fixed number, the grindstone 50 is trued. Then, when the truing is properly executed, the surface roughness value S of the first workpiece W ground immediately after the truing is restored to the value of the reference surface roughness Sth. In this case, it is considered that the surface roughness S of the workpiece W to be ground immediately before the next execution of the truing also exceeds the value of the surface roughness Smin to be satisfied as the workpiece W.

However, due to poor contact between the turret 60 and the grindstone 50 at the time of turwing, turwing may not be performed properly. In this case, the surface roughness value S of the first workpiece W ground immediately after the truing does not recover to the reference surface roughness Sth. When the grinding process of the workpiece W is continued using the grindstone 50 in this state, the surface roughness S of the workpiece W to be ground immediately before the next execution of the truing determines the reference surface roughness Smin to be satisfied as the workpiece W. It is more likely to fall below. As a result, the number of defective products generated due to poor grinding increases.

On the other hand, in the grinding machine 1, the first workpiece W ground immediately after the truing is sensed by the sensor 100, and the surface roughness of the workpiece W is detected. Then, based on the detection result, the determination unit 132 determines whether or not the surface roughness value S of the first workpiece W ground immediately after the truing is equal to or greater than the reference surface roughness Sth. As a result, when it is determined that the surface roughness value S of the first workpiece W ground immediately after the truing is less than the reference surface roughness Sth (defective), the truing on the grindstone 50 is executed again. do. As a result, the number of defective products generated due to poor grinding can be reduced.

(1-4. Processing by the trueing control unit 130)
Next, with reference to FIG. 5, the truing process executed by the truing control unit 130 will be described with reference to the flowchart. As shown in FIG. 5, in the truing process, first, it is determined whether or not there is an instruction to execute the truing (S1). As the processing by S1, for example, when the number of workpieces W ground by the grindstone 50 is measured after the last truing is executed and the number of workpieces W ground by the grindstone 50 reaches a certain number of times. An example is a case where a process of determining that an instruction to execute a grindstone is performed is performed.

Then, if there is no instruction to execute truing (S1: No), the process returns to the process of S1. On the other hand, if there is an instruction to execute the truing (S1: Yes), the truing execution unit 131 starts the truing execution process (S2). When the truing by the truing execution unit 131 is completed, the grinding process of the workpiece W by the grinding process control unit 120 is started.

In the process of S3, it is determined whether or not the grinding of the workpiece W is completed, that is, whether or not the grinding of the workpiece W is completed for the workpiece W to be ground first after the truing. Examples of the process of S3 include a case of performing a process of determining whether or not a notification to the effect that the grinding process of the workpiece W has been completed has been received from the grinding process control unit 120.

As a result, if the grinding of the workpiece W is not completed (S3: No), the process returns to the process of S3. On the other hand, when the grinding of the workpiece W is completed (S3: Yes), the sensor 100 is instructed to execute the sensing of the workpiece W (S4). After that, it is determined whether or not the detection result has been received from the sensor 100 (S5), and if it has not been received (S5: No), the process returns to the process of S5. On the other hand, when the detection result is received from 100 from the sensor (S5: Yes), the judgment process by the judgment unit 132, that is, the surface roughness of the work piece W first ground after the truing based on the detection result by the sensor 100. A process of determining whether or not the value S of the value S satisfies the reference surface roughness Sth is executed (S6).

If, as a result of the processing of S6, it is determined that the surface roughness value S of the workpiece W satisfies the reference surface roughness Sth (S6: Yes), it can be determined that the truing has been appropriately executed. Therefore, in this case, this process is terminated as it is. On the other hand, as a result of the processing of S6, when it is determined that the surface roughness value S of the workpiece W does not satisfy the reference surface roughness Sth (S6: No), it can be determined that the truing has not been properly executed. Therefore, in this case, the process returns to the process of S2, and the trueing is executed again.

In the process of S6, when it is continuously determined that the surface roughness value S of the workpiece W does not satisfy the reference surface roughness Sth, or the surface roughness value S of the workpiece W is the reference. If it is determined that the surface roughness Sth is not satisfied frequently in a short period of time, a process for warning the operator (such as displaying an error or sounding a warning sound) may be performed. As a result, when some trouble occurs in the Turua 60 or the like, the occurrence of the trouble can be detected at an early stage.

As described above, in the grinding machine 1, after executing the truing, it is determined whether or not the truing is properly executed, so that it is possible to confirm whether or not the truing is properly executed. Then, as a result of the confirmation, when it is determined that the true wing is not properly executed, the control for executing the true wing is executed again, so that the number of defective products generated due to the grinding defect can be reduced. ..

Further, in the present embodiment, even if the truing is not performed satisfactorily, the surface roughness value S of the work piece W to be ground first after the truing should satisfy the reference surface roughness as the work piece W. The value of the reference surface roughness Sth is adjusted so as to satisfy Smin. As a result, the number of defective products generated due to poor grinding can be reduced.

<2. Second Embodiment>
Next, the second embodiment will be described with reference to FIGS. 6 to 8. In the first embodiment, a case where it is determined whether or not the truing is properly performed based on the surface roughness of the workpiece W after processing has been described. On the other hand, in the second embodiment, the surface roughness of the end face of the contact detection pin 361 ground by the grindstone 50 is detected, and the surface roughness of the end face of the contact detection pin 361 is detected based on the detection result. Determine if it was executed properly. The same parts as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.

(2-1: Configuration of grinding machine 201)
As shown in FIG. 6, in the grinding machine 201, the headstock 220 is provided with a position detecting device 360 for detecting the position of the grindstone 50. The position detection device 360 includes a contact detection pin 361 extending in the X-axis direction. The contact detection pin 361 is a portion for detecting the position of the outer peripheral surface of the grindstone wheel 50, and the position of the grindstone wheel 50 is detected by bringing the grindstone wheel 50 into contact with the end surface of the contact detection pin 361 facing the Z-axis direction. ..

In the grinding machine 201, the outer peripheral surface of the grindstone 50 is brought into contact with the contact detection pin 361 before and after the truer 60 is used for truing. As a result, it is possible to grasp the change in the outer diameter of the grindstone 50 due to the truing, that is, the cutting amount due to the truing.

Further, in the grinding machine 201, the air supply device 90 and the sensor 100 are arranged at positions adjacent to the grindstone 50 in the Z-axis direction. The air supply device 90 and the sensor 100 are arranged to face the end face of the contact detection pin 361 by moving the table 10 in the Z-axis direction. In the grinding machine 201, the surface roughness of the end surface of the contact detection pin 361 that has come into contact with the outer peripheral surface of the grindstone 50 before truing is detected by the sensor 100, and the determination unit 132 makes a determination based on the detection result.

As shown in FIG. 7, in the present embodiment, when the value S of the surface roughness of the end surface of the contact detection pin 361 is larger than the predetermined reference surface roughness Sth, it is determined that the truing is properly executed. do. In this respect, it is different from the first embodiment in which it is determined that the truing is properly executed when the surface roughness value S of the workpiece W is smaller than the reference surface roughness Sth.

(2-2: Flow when detecting by the sensor 100)
Next, with reference to FIG. 6, a flow when performing detection by the sensor 100 will be described. After the truing with respect to the grindstone 50 is completed, the table 10 is moved in the Z-axis direction to a position where the outer peripheral surface of the grindstone 50 faces the end surface of the contact detection pin 361. Next, by moving the grindstone base 40 in the X-axis direction, the outer peripheral surface of the grindstone wheel 50 is brought into contact with the contact detection pin 361.

Next, after moving the table 10 in the Z-axis direction to a position where the end face of the contact detection pin 361 faces the sensor 100, the sensor 100 detects the surface roughness of the end face of the contact detection pin 361. In the process of moving the grindstone 50 from the position facing the contact detection pin 361 to facing the sensor 100, the contact detection pin 361 passes in front of the air supply device 90. At this time, the air supply device 90 blows air from the air blowing portion 91 toward the end face of the contact detection pin 361, and blows off the deposits on the end face of the contact detection pin 361. As a result, when the sensor 100 detects the surface roughness of the end face of the contact detection pin 361, the detection accuracy can be improved.

When the end surface of the contact detection pin 361 and the sensor 100 are opposed to each other, the outer peripheral surface of the grindstone 50 faces the workpiece W supported by the headstock 220 and the tailstock 30. Therefore, the grindstone 50 may start moving in the X-axis direction while sensing the end face of the contact detection pin 361 by the sensor 100.

Further, the end face of the contact detection pin 361 may be sensed by the sensor 100 in parallel with the grinding of the workpiece W by the grindstone 50. In this case, it is not necessary to interrupt the grinding process of the workpiece W by the grindstone 50 until the sensing of the end face of the contact detection pin 361 by the sensor 100 is completed. Therefore, when grinding the workpiece W, it is possible to improve the processing efficiency. In this case, if it is determined that the surface roughness of the end surface of the contact detection pin 361 is not good, the truing is executed again after the grinding process of the workpiece W being ground is completed.

As described above, in the present embodiment, the contact detection pin 361 used when measuring the outer diameter of the grindstone 50 is also used for determining whether or not the truing is properly executed. In this case, as compared with the case where a component different from the contact detection pin 361 is provided on the table 10 and the grindstone 50 is brought into contact with the component and then the sensor 100 performs sensing, the number of movements and the amount of movement of the table 10 are increased. Can be reduced. Therefore, it is possible to shorten the time from the completion of the grinding process of the workpiece W to the start of the grinding process of the next workpiece W.

In the grinding machine 201, the air supply device 90 and the sensor 100 are provided at adjacent positions in the Z-axis direction, and the air supply device 90 is arranged between the sensor 100 and the grindstone 50. In this way, by detecting the surface roughness of the end face of the contact detection pin 361 and determining the necessity of re-truing based on the detection result, the coolant scattered during the grinding process of the workpiece W The sensor 100 can be arranged at a position where it is difficult for the sensor 100 to adhere. Therefore, the accuracy of detecting the surface roughness by the sensor 100 can be maintained.

(2-3: Processing by the trueing control unit 330)
Next, the truing process 2 executed by the truing control unit 330 will be described with reference to FIG. As shown in FIG. 8, in the truing process 2, first, it is determined whether or not there is an instruction to execute the truing (S1). In the process of S1, if there is no instruction to execute trouting (S1: No), the process returns to the process of S1. On the other hand, if there is an instruction to execute the truing (S1: Yes), the truing execution process by the truing execution unit 131 is started (S2).

After the processing of S2 is completed, the outer peripheral surface of the grindstone 50 is brought into contact with the contact detection pin 361, and the outer diameter of the grindstone 50 is measured (S203). After that, the sensor 100 is instructed to perform sensing of the end face of the contact detection pin 361 ground by the grindstone 50 (S204).

After that, it is determined whether or not the detection result has been received from the sensor 100 (S5), and if it has not been received (S5: No), the process returns to the process of S5. On the other hand, when the detection result is received from 100 from the sensor (S5: Yes), the determination process by the determination unit 132, that is, the value S of the surface roughness of the end surface of the contact detection pin 361 sets the reference surface roughness Sth. A process of determining whether or not the condition is satisfied is executed (S206).

If, as a result of the processing of S206, it is determined that the surface roughness value S of the contact detection pin 361 satisfies the reference surface roughness Sth (S206: Yes), it can be determined that the truing has been properly executed. Therefore, in this case, this process is terminated as it is. On the other hand, as a result of the processing of S206, when it is determined that the value of the surface roughness of the contact detection pin 361 does not satisfy the S reference surface roughness Sth (S206: No), it can be determined that the trueing has not been properly executed. .. Therefore, in this case, the process returns to the process of S2, and the trueing is executed again.

<3. Others>
Although the present invention has been described above based on the above embodiments, the present invention is not limited to the above embodiments, and various modifications and improvements can be made without departing from the spirit of the present invention. It can be easily inferred.

<4. Effect>
As described above, in the grinding machines 1,201 to which the present invention is applied, the spindles 20 and 220 that rotatably support the workpiece W, the grindstone 50 for grinding the workpiece W, and the grindstone 50 are trued. 60, a sensor 100 that detects the surface roughness of the object to be ground, which is any object other than the object W ground by the workpiece W and the grindstone 50, and control of the trueing of the grindstone 50. The control devices 110 and 310 for performing the operation are provided. The control devices 110 and 310 determine whether or not the surface roughness S of the object to be ground ground immediately after the grindstone 50 has been trued has reached a predetermined reference surface roughness Sth. To be equipped.

According to the grinding machines 1,201, it is determined whether or not the surface roughness S of the ground object to be ground reaches a predetermined reference surface roughness Sth immediately after the grindstone 50 is trued. Therefore, it is possible to confirm whether or not the growing has been properly carried out.

In the grinding machines 1,201 described above, when the control devices 110 and 310 determine that the surface roughness S of the workpiece W has not reached the reference surface roughness Sth, the control devices 110 and 310 perform growing with respect to the grindstone 50 again. Perform control of. According to the grinding machines 1,201, the number of defective products generated due to poor grinding can be reduced.

In the grinding machine 1 described above, the object to be ground is a workpiece W that has been ground by the grindstone 50, and the sensor 100 has a rough surface of the workpiece W with the workpiece W supported by the spindle 20. Detects the surface.

According to the grinding machine 1, when the surface roughness of the work piece W is detected by the sensor 100 and it is determined that the truing is necessary again, the truing to the grindstone 50 is referred to as the transportation of the work piece W. Can be done in parallel. That is, the grinding process of the workpiece W is performed as compared with the case where the surface roughness of the workpiece W is detected after the workpiece W after machining is transported to another place and the truing is performed again based on the detection result. It is possible to shorten the time from the end to the start of the grinding process of the next workpiece W.

In the grinding machine 201 described above, the grinding machine 201 includes a contact detection pin 361 that measures the outer diameter of the grindstone 50 by contact with the grindstone 50. The object to be ground is the contact detection pin 361, and the sensor 100 detects the surface roughness of the contact detection pin 361 that comes into contact with the grindstone 50 immediately after growing.

According to the grinding machine 201, the contact detection pin 361 used when measuring the outer diameter of the grindstone 50 can also be used for determining whether or not the true wing is properly executed. Therefore, as compared with the case where other parts are separately provided and the grindstone 50 is brought into contact with the parts and then the sensor 100 performs sensing, the grinding of the next workpiece W is performed after the grinding of the workpiece W is completed. It is possible to shorten the time until the start of. Further, since the sensor 100 can be easily arranged at a position where foreign matter such as coolant scattered during the grinding process of the workpiece is hard to adhere, it is possible to suppress a decrease in the detection accuracy of the sensor 100 due to the adhered matter.

In the above-mentioned grinding machines 1,201, the sensor 100 is mounted on the substrate 104, the light emitting element mounted on the substrate 104 and emitting light toward the workpiece W, and mounted on the substrate 104 in the vicinity of the light emitting element, and the workpiece is mounted. It includes a light receiving element 106 as a first light receiving element 106 and a second light receiving element 107 capable of receiving the reflected light from W, and a calculation unit 103 that calculates the surface roughness based on the light receiving amount of the light receiving element. According to this grinding machine 1, since the surface roughness of the workpiece W can be detected in a non-contact manner, it is possible to prevent the workpiece W after grinding from being scratched due to the detection of the surface roughness.

1,201: Grinding machine, 20,220: Headstock, 50: Grindstone, 60: Turua, 100: Sensor, 103: Calculation unit, 104: Substrate, 105: Light emitting element, 106: First light receiving element (light receiving element) ), 107: Second light receiving element (light receiving element), 110, 310: Control device, 132: Judgment unit, 361: Contact detection pin, Sth: Reference surface roughness, W: Work piece

Claims (5)

A spindle that rotatably supports the workpiece and
A grindstone that grinds the workpiece and
The Tsurua that slew the grindstone and
A sensor that detects the surface roughness of the surface roughness detection object and a sensor that uses the workpiece as the surface roughness detection object.
A control device that controls the truing of the grindstone and
With
The control device is
A truing execution unit that executes truing on the grindstone, and a truing execution unit.
A determination unit for determining whether or not the surface roughness of the workpiece ground immediately after performing the truing on the grindstone by the truing execution unit has reached a predetermined reference surface roughness.
With
The grinding machine is a grinding machine that re-executes truing on the grindstone when it is determined by the determination unit that the surface roughness of the workpiece does not reach the reference surface roughness. The grinding machine according to claim 1, wherein the sensor detects the surface roughness of the workpiece while the workpiece is supported by the spindle. A spindle that rotatably supports the workpiece and
A grindstone that grinds the workpiece and
The Tsurua that slew the grindstone and
It is a judgment target that is a contact detection pin that is ground by the grindstone immediately after the truing of the grindstone and measures the outer diameter of the grindstone by contact with the grindstone, and the truing to the grindstone is appropriate. The judgment object used to judge whether or not it was executed, and
A sensor that detects the surface roughness of the surface roughness detection object and a sensor that uses the determination object as the surface roughness detection object.
A control device that controls the truing of the grindstone and
With
The control device is
A truing execution unit that executes truing on the grindstone, and a truing execution unit.
A determination unit for determining whether or not the surface roughness of the determination object ground immediately after the grindstone is towed by the truing execution unit reaches a predetermined reference surface roughness.
With
The grinding machine is a grinding machine that re-executes truing on the grindstone when the determination unit determines that the surface roughness of the determination object does not reach the reference surface roughness. The sensor is
With the board
A light emitting element mounted on the substrate and emitting light toward the surface roughness detection object,
A light receiving element mounted on the substrate in the vicinity of the light emitting element and capable of receiving reflected light from the surface roughness detection object.
An arithmetic unit that calculates the surface roughness of the surface roughness detection object based on the amount of light received by the light receiving element, and
The grinding machine according to any one of claims 1 to 3, wherein the grinding machine comprises. The light receiving element is a CCD or CMOS element.
The grinding machine according to claim 4 , wherein the calculation unit calculates the surface roughness of the surface roughness detection object based on the detection result by the CCD or the CMOS element.

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