JP2016132088A - Grinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grinder capable of preventing a temperature rise in a processing site.SOLUTION: During a pass operation, temperature determination means 72 determines whether or not the measured temperature of a thermo-couple 50 exceeds an upper limit set temperature. Pass action speed setting means 74 (forming a part of parameter setting means) decreases the travel speed of a screw-shaped abrasive in a pass operation, if said measured temperature exceeds an upper limit set temperature. If not excess, the travel speed is set to an initial set velocity. Pass operation execution command means 76 (forming a part of the cutting operation command means) controls a Z-axis motor 26 in accordance with a pass action velocity set, thereby to control the travel speed of the screw-shaped abrasive in the pass action.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a grinding machine for grinding gears and the like.

  In a machine tool for grinding an object such as a gear grinding machine, grinding is performed by bringing a rotating grinding tool into contact with the object. At this time, a processing site that is a contact point between the object and the grinding tool may become high temperature due to frictional heat. This is not preferable because thermal cracks are generated in the cutting tool or unnecessary heat treatment is performed on the object.

  Therefore, in the machine tool, excessive temperature rise is prevented by continuously discharging coolant (cooling medium) to the machining site. In addition, a method for efficiently supplying this coolant to a processing site has been studied (for example, Patent Document 1).

JP2012-213832

  However, in the prior art as described above, the coolant discharge amount is fixed even though the temperature of the processed part is not constant depending on the material, shape, processing speed, and the like of the object. For this reason, in some situations, despite the fact that the coolant is supplied, heat that exceeds the cooling capacity is generated, thermal cracks occur in the cutting tool, and unnecessary heat treatment is performed on the object. Has occurred.

  An object of the present invention is to provide a grinding machine that solves the above-described problems and can prevent a temperature rise in a processed part.

  Some features that can be applied independently in the grinding machine according to the present invention are shown below.

(1) A grinding machine according to the present invention includes a workpiece holding unit for holding a workpiece to be ground and a grindstone holding unit for rotatably holding a grindstone for cutting the workpiece held by the workpiece holding unit. A grindstone rotation driving unit that rotates the grindstone held by the grindstone holding unit, a grindstone moving unit that moves the grindstone held by the grindstone holding unit with respect to the workpiece, and the workpiece is cut by the grindstone. A grinder equipped with a control unit that controls the grindstone rotation drive unit and the grindstone moving unit, and a coolant discharge unit that discharges the coolant to the processing site of the workpiece by the grindstone, A temperature measurement unit that measures the temperature of the coolant at the machining site or the coolant that has passed through the machining site is provided, and the control unit is configured such that the temperature measured by the temperature measurement unit is a predetermined temperature. If it exceeds, at least (i) the speed at which the grindstone reciprocates and crosses the workpiece while cutting the workpiece so that the measured temperature does not exceed the predetermined temperature, (ii) the grindstone is One of the distances to move the grindstone toward the center of the workpiece is adjusted after the workpiece is cut across the workpiece and then cut in the opposite direction.

  Therefore, it is possible to reduce an undesired temperature rise at the processing site.

(2) In the grinding machine according to the present invention, the workpiece holding unit holds the workpiece rotatably with the rotation shaft, and the temperature measurement unit is provided on the rotation shaft of the workpiece holding unit. The measured temperature data is transmitted to the control unit by wireless communication.

  Therefore, the temperature can be measured at a position closer to the processing site.

(3) The grinding machine according to the present invention is characterized in that the temperature measurement unit includes a non-contact temperature measurement sensor for measuring the temperature of the coolant in a non-contact manner.

  Therefore, the temperature of the processing site can be acquired more accurately.

(4) The grinding machine according to the present invention is characterized in that the temperature measuring unit estimates the temperature of the coolant in the processing site based on the impurity concentration contained in the coolant that has passed through the processing unit. .

  Therefore, the temperature of the processing site can be estimated without providing a temperature sensor.

(5) The grinding machine according to the present invention is characterized in that the control unit adjusts the rotational speed at which the grindstone cuts the workpiece.

  Therefore, by adjusting the rotational speed of the grindstone, it is possible to reduce an undesired temperature rise in the processed part.

(6) The grinding machine according to the present invention is characterized in that the control unit adjusts the amount of coolant discharged to the processing site.

  Therefore, by adjusting the coolant amount, it is possible to reduce an undesired temperature rise in the processed part.

(7) The grinding machine according to the present invention further includes a mixing unit that mixes the coolant with the coolant discharged to the processing site, and the control unit further determines whether the coolant is mixed with the coolant or not. An adjustment is made so that the measured temperature of the coolant is lower than a predetermined temperature.

  Therefore, it is possible to reduce an undesired temperature rise at the processing site depending on whether or not the coolant is mixed.

(8) A control program for a grinding machine according to the present invention is a control program for realizing a control unit of a grinding machine by a computer, and the computer controls the coolant at a machining site or the temperature of the coolant that has passed through the machining site. Temperature measurement means for acquiring a measured temperature from a temperature measurement unit to measure, and determining whether the measured temperature exceeds a predetermined temperature; and if it is determined that the measured temperature exceeds a predetermined temperature, at least, (i) a speed at which the grindstone cuts the workpiece while reciprocating and traverses the workpiece; and (ii) after the grindstone cuts across the workpiece and then cuts in the opposite direction, Parameter setting means for adjusting any of the distances for moving the grindstone toward the center of the workpiece and setting as parameters, and based on the set parameters In order to function as cutting operation command means for executing the cutting operation.

  Therefore, it is possible to reduce an undesired temperature rise at the processing site.

(9) A grinding method according to the present invention holds a workpiece to be ground, holds a grindstone for cutting the held workpiece rotatably, rotates the grindstone held by the grindstone holding portion, and The grindstone held by the holding unit is moved with respect to the workpiece, the rotation and movement of the grindstone are controlled so that the workpiece is cut by the grindstone, and the coolant is discharged to the processing site of the workpiece by the grindstone. A grinding method for measuring a coolant temperature of the machining site or a coolant that has passed through the machining site, and if the measured temperature exceeds a predetermined temperature, the measured temperature exceeds the predetermined temperature. At least (i) the speed at which the grindstone reciprocates across the workpiece while cutting the workpiece, and (ii) the grinding stone cuts across the workpiece and then the opposite One of the distances by which the grindstone is moved toward the center of the workpiece is adjusted before cutting across the direction.

  Therefore, it is possible to reduce an undesired temperature rise at the processing site.

(10) A grinding machine according to the present invention includes a workpiece holding unit for holding a workpiece to be ground, and a grindstone holding unit for rotatably holding a grindstone for cutting the workpiece held by the workpiece holding unit. A grindstone rotation driving unit that rotates the grindstone held by the grindstone holding unit, a grindstone moving unit that moves the grindstone held by the grindstone holding unit with respect to the workpiece, and the workpiece is cut by the grindstone. A grinder comprising: a control unit that controls the grindstone rotation driving unit and the grindstone moving unit; and a coolant discharge unit that discharges coolant to a processing portion of the workpiece by the grindstone by a supply unit. A temperature measuring unit that measures the temperature of the coolant in the machining part or the coolant that has passed through the machining part, and the control unit is configured such that the temperature measured by the temperature measurement part is a predetermined temperature. The amount of coolant discharged to the machining site is adjusted so that the measured temperature does not exceed a predetermined temperature when the temperature exceeds the specified temperature.

  Therefore, by adjusting the coolant amount, it is possible to reduce an undesired temperature rise in the processed part.

(11) The grinding machine according to the present invention further includes a mixing unit that mixes the coolant with the coolant discharged to the processing site, and the control unit further determines whether or not the coolant is mixed with the coolant. Adjustment is performed so that the measured temperature of the coolant falls below a predetermined temperature.

  Therefore, it is possible to reduce an undesired temperature rise at the processing site depending on whether or not the coolant is mixed.

(12) A control program for a grinding machine according to the present invention is a control program for realizing a control unit of a grinding machine by a computer, and the computer controls the coolant at the machining site or the temperature of the coolant that has passed through the machining site. A temperature determination unit that acquires a measured temperature from a temperature measuring unit to measure and determines whether the measured temperature exceeds a predetermined temperature; and when the measured temperature is determined to exceed a predetermined temperature, the processing Parameter setting means for adjusting the amount of coolant discharged to the part and setting it as a parameter, and functioning as cutting operation command means for executing a cutting operation based on the set parameter.

  Therefore, by adjusting the coolant amount, it is possible to reduce an undesired temperature rise in the processed part.

(13) The grinding method according to the present invention holds a workpiece to be ground, holds a grindstone for cutting the held workpiece rotatably, rotates the grindstone held by the grindstone holding portion, and The grindstone held by the holding unit is moved with respect to the workpiece, the rotation and movement of the grindstone are controlled so that the workpiece is cut by the grindstone, and the coolant is discharged to the processing site of the workpiece by the grindstone. A grinding method for measuring a coolant temperature of the machining site or a coolant that has passed through the machining site, and if the measured temperature exceeds a predetermined temperature, the measured temperature exceeds the predetermined temperature. The amount of coolant discharged to the processing site is adjusted so as to be eliminated.

  Therefore, by adjusting the coolant amount, it is possible to reduce an undesired temperature rise in the processed part.

(14) A grinding machine according to the present invention includes a workpiece holding portion for holding a workpiece to be ground, and a grindstone holding portion for rotatably holding a grindstone for cutting the workpiece held by the workpiece holding portion. A grindstone rotation driving unit that rotates the grindstone held by the grindstone holding unit, a grindstone moving unit that moves the grindstone held by the grindstone holding unit with respect to the workpiece, and the workpiece is cut by the grindstone. A grinder equipped with a control unit that controls the grindstone rotation drive unit and the grindstone moving unit, and a coolant discharge unit that discharges the coolant to the processing site of the workpiece by the grindstone, A temperature measurement unit that measures the temperature of the coolant at the machining site or the coolant that has passed through the machining site is provided, and the control unit is configured such that the temperature measured by the temperature measurement unit is a predetermined temperature. If the temperature exceeds the predetermined temperature, the coolant is mixed with the coolant so that the measured temperature does not exceed the predetermined temperature.

  Therefore, it is possible to reduce an undesired temperature rise at the processing site depending on whether or not the coolant is mixed.

(15) A control program for a grinding machine according to the present invention is a control program for realizing a control unit of a grinding machine by a computer, and the computer controls the coolant at the machining site or the temperature of the coolant that has passed through the machining site. A temperature determination unit that acquires a measured temperature from a temperature measuring unit to measure and determines whether the measured temperature exceeds a predetermined temperature; and when the measured temperature is determined to exceed a predetermined temperature, the coolant Parameter setting means for setting whether or not coolant is mixed as a parameter, and cutting action command means for executing a cutting action based on the set parameter.

  Therefore, it is possible to reduce an undesired temperature rise at the processing site depending on whether or not the coolant is mixed.

(16) The grinding method according to the present invention holds a workpiece to be ground, holds a grindstone for cutting the held workpiece rotatably, rotates the grindstone held by the grindstone holding portion, and The grindstone held by the holding unit is moved with respect to the workpiece, the rotation and movement of the grindstone are controlled so that the workpiece is cut by the grindstone, and the coolant is discharged to the processing site of the workpiece by the grindstone. A grinding method for measuring a coolant temperature of the machining site or a coolant that has passed through the machining site, and if the measured temperature exceeds a predetermined temperature, the measured temperature exceeds the predetermined temperature. The coolant is mixed with the coolant so as to be eliminated.

  Therefore, it is possible to reduce an undesired temperature rise at the processing site depending on whether or not the coolant is mixed.

(A) A grinding machine according to the present invention includes a workpiece holding unit for holding a workpiece to be ground, and a grindstone holding unit for rotatably holding a grindstone for cutting the workpiece held by the workpiece holding unit. A grindstone rotation driving unit that rotates the grindstone held by the grindstone holding unit, a grindstone moving unit that moves the grindstone held by the grindstone holding unit with respect to the workpiece, and the workpiece is cut by the grindstone. A grinder equipped with a control unit that controls the grindstone rotation drive unit and the grindstone moving unit, and a coolant discharge unit that discharges the coolant to the processing site of the workpiece by the grindstone, A temperature measurement unit that measures the temperature of the coolant at the machining site or the coolant that has passed through the machining site is provided, and the control unit is configured such that the temperature measured by the temperature measurement unit is a predetermined temperature. If it exceeds, as the measured temperature does not exceed a predetermined temperature, it is characterized by adjusting the rotational speed of the grinding wheel for cutting the workpiece.

  Therefore, it is possible to reduce an undesired temperature rise at the processing site.

(B) In the grinding machine according to the present invention, the workpiece holding unit holds the workpiece rotatably with a rotation shaft, and the temperature measurement unit is provided on the rotation shaft of the workpiece holding unit, and the temperature measurement The measured temperature data of the unit is transmitted to the control unit by wireless communication.

  Therefore, the temperature can be measured at a position closer to the processing site.

(C) The grinding machine according to the present invention is characterized in that the temperature measurement unit includes a non-contact temperature measurement sensor for measuring the temperature of the coolant in a non-contact manner.

  Therefore, the temperature of the processing site can be acquired more accurately.

(D) The grinding machine according to the present invention is characterized in that the temperature measuring unit estimates the temperature of the coolant in the processing site based on the impurity concentration contained in the coolant that has passed through the processing unit. .

  Therefore, the temperature of the processing site can be estimated without providing a temperature sensor.

(E) The grinding machine according to the present invention is characterized in that the control unit adjusts the amount of coolant discharged to the processing site.

  Therefore, by adjusting the coolant amount, it is possible to reduce an undesired temperature rise in the processed part.

(F) The grinding machine according to the present invention includes a mixing unit that mixes the coolant with the coolant discharged to the processing site, and the control unit measures the coolant depending on whether the coolant is mixed with the coolant. The adjustment is performed so that the temperature falls below a predetermined temperature.

  Therefore, it is possible to reduce an undesired temperature rise at the processing site depending on whether or not the coolant is mixed.

(G) The control program according to the present invention is a control program for realizing the control unit of the grinding machine by a computer, and the computer measures the temperature of the coolant at the machining site or the coolant that has passed through the machining site. A temperature determination means for acquiring a measured temperature from a section and determining whether the measured temperature exceeds a predetermined temperature; and if the measured temperature exceeds a predetermined temperature, the grindstone is moved to the workpiece. The parameter setting means for adjusting the rotation speed for cutting and setting the parameters, and the cutting action command means for executing the cutting action based on the set parameters.

  Therefore, it is possible to reduce an undesired temperature rise at the processing site.

(H) The control method according to the present invention holds a workpiece to be ground, holds a grindstone for cutting the held workpiece rotatably, rotates the grindstone held by the grindstone holding portion, and The grindstone held by the holding unit is moved with respect to the workpiece, the rotation and movement of the grindstone are controlled so that the workpiece is cut by the grindstone, and the coolant is discharged to the processing site of the workpiece by the grindstone. A grinding method for measuring a coolant temperature of the machining site or a coolant that has passed through the machining site, and if the measured temperature exceeds a predetermined temperature, the measured temperature exceeds the predetermined temperature. The number of revolutions at which the grindstone cuts the workpiece is adjusted so as to be eliminated.

  Therefore, it is possible to reduce an undesired temperature rise at the processing site.

  The “work holding part” refers to a part that holds a work for grinding regardless of whether it is fixed or rotatable, and the spindle motor 6 corresponds to this in the embodiment.

  The “grinding wheel rotation driving unit” refers to a unit for rotating the grinding wheel, and in the embodiment, the grinding spindle motor 16 corresponds to this.

  The “grinding wheel moving unit” refers to a unit for moving the whetstone with respect to the workpiece. In the embodiment, the X-axis motor 36, the Y-axis motor 32, the Z-axis motor 26, and the ball screw mechanism correspond to this.

  The “control unit” refers to a unit that controls at least the grindstone moving unit and the grindstone rotation driving unit. In the embodiment, the control unit 80 corresponds to this.

  “Temperature measurement unit” refers to a part to be measured or to estimate the temperature of the coolant that has passed through the part to be processed or the part to be processed. In the embodiment, the thermocouple 50 corresponds to this.

  In the embodiment, “temperature determination means” corresponds to steps S4 and S7.

  “Parameter setting means” corresponds to steps S11, S22, and S32 in the embodiment.

  In the embodiment, the “cutting operation command means” corresponds to steps S2 and S5.

  The “program” is a concept that includes not only a program that can be directly executed by the CPU, but also a source-format program, a compressed program, an encrypted program, and the like.

It is an external view of the gear grinding machine 2 by one Embodiment of this invention. It is a figure which shows the fundamental operation | movement of the gear grinding machine. It is a figure which shows a coolant system. 3 is a functional block diagram of a control unit 80. FIG. This is a hardware configuration when the control unit 80 is configured using a CPU 90. 3 is a flowchart of a control program 102. It is a detailed flowchart of cutting operation control. It is a functional block diagram of the control part 80 in 2nd Embodiment. 3 is a flowchart of a control program 102. It is a functional block diagram of the control part 80 in 3rd Embodiment. This is a hardware configuration when the control unit 80 is configured using a CPU 90. 3 is a flowchart of a control program 102. It is a figure which shows a coolant system. It is a figure which shows the coolant system which provided the impurity sensor 61. FIG.

1. First embodiment
1.1 Outline of Configuration FIG. 1 shows the structure of a gear grinding machine 2 according to an embodiment of the present invention. On the upper surface of the bed 4, a work spindle motor 6 having a vertical rotation shaft 8 is provided. A gear 10 that is an object is attached to the tip of the rotating shaft 8.

  The threaded grindstone 12 has rack teeth 14 (threads formed in a spiral shape) on the outer peripheral surface thereof. Grinding is performed by meshing the rack teeth 14 with the gear 10.

  The threaded grindstone 12 can be moved in the X direction, the Y direction, and the Z direction by a mechanism described below.

  The threaded grindstone 12 is attached to the rotating shaft 18 of the grinding spindle motor 16 of the grinding head 20. Therefore, the threaded grindstone 12 can be rotated in the Q direction. The grinding head 20 is mounted on a guide rail 22 provided on the table 24 so as to be slidable in the Z direction. A Z-axis motor 26 is provided on the upper portion of the table 24, and its rotating shaft is connected to the grinding head 20 via a ball screw mechanism (not shown). Therefore, by rotating the Z-axis motor 26, the threaded grindstone 12 can be moved in the Z-axis direction.

  The table 24 is mounted on the guide rail 30 on the upper surface of the table 28 so as to be slidable in the Y direction. A Y-axis motor 32 is provided at the end of the table 28, and its rotating shaft is connected to the table 24 via a ball screw mechanism (not shown). Therefore, by rotating the Y-axis motor 32, the table 24 (that is, the threaded grindstone 12) can be moved in the Y-axis direction.

The table 28 is slidably mounted on the guide rail 34 on the upper surface of the bed 4 in the X direction. An X-axis motor 36 is provided at the end of the bed 4 and its rotating shaft is connected to the table 28 via a ball screw mechanism (not shown). Therefore, by rotating the X-axis motor 36, the table 28 (that is, the threaded grindstone 12) can be moved in the X-axis direction.

1.2 Basic Operation FIG. 2 shows the basic operation of the gear grinding machine 2. The X-axis motor 36, the Y-axis motor 32, and the Z-axis motor 26 are controlled to place the threaded grinding wheel 12 obliquely below the gear 10 as shown in FIG. 2A (approach operation). At this time, the tip of the threaded grindstone 12 is made to coincide with the end of the gear 10 at a vertical position. Next, as shown in FIG. 2B, the threaded grindstone 12 is moved closer to the direction of the gear 10 (horizontal direction) by a predetermined amount (cutting amount) (cutting operation).

  Next, as shown in FIG. 2C, the threaded grindstone 12 is moved in the vertical direction while rotating (pass operation). Thereby, the gear 10 is cut according to the depth of the cut amount. Since the screw-shaped grindstone 12 is rotating, the gear 10 is also rotated by the spindle motor 6 so as to match this. This pass operation is performed until the cutting reaches the upper surface of the gear 10 as shown in FIG. 2D.

  Next, as shown in FIG. 2E, a cutting operation is performed. That is, the threaded grindstone 12 is moved closer to the direction of the gear 10 (horizontal direction) by a predetermined depth of cut.

Thereafter, a pass operation is performed in the downward direction to perform cutting. Thereafter, the cutting operation and the pass operation are repeated alternately. When these operations are executed a predetermined number of times, the screw-shaped grindstone 12 is separated from the gear 10 (grinding wheel meshing separation operation). The cutting operation is performed as described above.

1.3 Coolant System Returning to FIG. 1, a coolant supply device 40 is provided at the tip of the grinding head 20 so as to be positioned above the threaded grinding wheel 12. The coolant supply device 40 is provided with a nozzle 42, and the coolant is discharged to a contact portion (processing portion) between the screw-shaped grindstone 12 and the gear 10.

  The discharged coolant is collected in a collection tank (not shown) through the collection passage 44 of the bed 4. At this time, most of the discharged coolant hits the housing of the work spindle motor 6 and then goes to the recovery passage 44 of the bed 4.

  In this embodiment, a thermocouple 50 which is a temperature measuring unit is provided at a portion of the work spindle motor 6 where the coolant hits. The temperature of the coolant can be measured by the thermocouple 50.

  At the time of cutting, a spark is generated at the processing site. Since the screw-shaped grindstone 12 is rotating in the Q direction in FIG. 1, the spark flies downward from the processing site. Therefore, both the coolant and the spark are provided at the position where the thermocouple 50 is provided.

FIG. 3 is a block diagram showing the coolant recovery system. The coolant supplied to the coolant supply device 40 by the oil supply pump 66 is discharged from the nozzle 42 to the processing site. The coolant that has passed through the processing site is recovered from the recovery passage 44 of the bed 4 to the recovery tank 60. The recovered coolant is washed by the washing device 62 and then sent to the clean tank 64. The oil supply pump 66 sends the coolant of the clean tank 64 to the coolant supply device 40. In this way, the coolant is supplied.

1.4 Outline of Control Unit FIG. 4 is a functional block diagram of the control unit 80 that controls the above-described units. During the pass operation, the temperature determination unit 72 determines whether or not the measured temperature of the thermocouple 50 exceeds the upper limit set temperature.

The pass operation speed setting means 74 (which constitutes a part of the parameter setting means) reduces the moving speed of the threaded grindstone 12 in the pass operation if the measured temperature exceeds the upper limit set temperature. If not exceeded, the initial setting speed is assumed. The pass motion execution command means 76 (which constitutes a part of the cutting motion command means) controls the Z-axis motor 26 according to the set pass motion speed to control the moving speed of the screw-shaped grindstone 12 in the pass motion. To do.

1.5 Hardware Configuration of Control Unit FIG. 5 shows a hardware configuration when the control unit 80 is configured using the CPU 90. A memory 92, a touch screen 94, a non-volatile memory 96, a grinding spindle motor 16, an X-axis motor 36, a Y-axis motor 32, a Z-axis motor 26, and a thermocouple 50 are connected to the CPU 90.

  The touch screen 94 is for displaying the state of the gear grinding machine 2 and receiving an operator's command. The grinding spindle motor 16 is for rotating the threaded grinding wheel 12. The X-axis motor 36, the Y-axis motor 32, and the Z-axis motor 26 are for moving the screw-shaped grindstone 12 in the X-axis, Y-axis, and Z-axis directions. The thermocouple 50 is for measuring the temperature of the coolant.

An operating system 100 and a control program 102 are recorded in the nonvolatile memory 96. The control program 102 performs its function in cooperation with the operating system 100.

1.6 Processing by Control Program FIG. 6 shows a flowchart of the control program 102. The CPU 90 displays a parameter input screen on the touch screen 94. In response to this, the operator initially sets parameters such as the pass speed, the pass amount, the cutting speed, the cutting amount, the grindstone rotation speed, the upper limit set temperature, and the number of passes (step S1). The CPU 90 records this parameter in the memory 92.

  When the start button on the touch screen 94 is pressed, the CPU 90 controls the X-axis motor 36, the Y-axis motor 32, and the Z-axis motor 26 to perform the approach operation of the screw-shaped grindstone 12 (see FIG. 2A). Note that the movement of the screw-shaped grindstone 12 in the X, Y, and Z-axis directions is performed by controlling the X-axis motor 36, the Y-axis motor 32, and the Z-axis motor 26. To do.

  When the approach operation is finished, the CPU 90 controls the grinding spindle motor 16 to rotate the screw-shaped grinding wheel 12 so that the initially set grinding wheel rotational speed is obtained. Further, the cutting operation is started at the initially set cutting speed (moving speed in the X direction) (see FIG. 2B, step S2).

  The CPU 90 calculates the amount of movement in the X direction from the start of the cutting operation based on the command amount for the X-axis motor 36. It is determined whether or not the movement amount has reached an initial cut amount (step S3). If not, the cutting operation is continued through step S4. If the amount of movement in the X direction reaches the initial cut amount, it is determined that the cut operation has been completed, and the pass operation is started (step S5).

  In step S4 during the cutting operation, the CPU 90 acquires the measured temperature from the thermocouple 50 and performs the cutting operation control (step S4). FIG. 7A shows details of the cutting operation control.

  The CPU 90 determines whether or not the measured temperature exceeds the upper limit set temperature (step S41). If not, the cutting operation is continued. If the measured temperature exceeds the upper limit set temperature, the cutting operation is terminated and the operation proceeds to the pass operation even if the movement amount in the X direction has not reached the initial cutting amount.

  The temperature of the processing site in the pass operation varies depending on the depth of cut. That is, the greater the depth of cut, the higher the temperature in the pass operation. Therefore, in step S4, if the temperature already exceeds the upper limit at the stage of cutting in the cutting operation, the cutting operation is terminated at that time even if the cutting operation has not reached the predetermined cutting amount. I am doing so. In this embodiment, the temperature determination in step S4 is performed every predetermined time (for example, every 5 seconds).

  When the cutting operation is finished, the CPU 90 starts the pass operation of the threaded grindstone 12 (step S5). In the pass operation, the CPU 90 moves the screw-shaped grindstone 12 in the Z direction at an initially set pass speed (see FIGS. 2C and 2D).

  The CPU 90 calculates the amount of movement in the Z direction from the start of the pass operation based on the command amount for the Z-axis motor 26. Further, it is determined whether or not the movement amount in the Z direction has reached the initially set path amount (step S6). If not, the pass operation is continued through step S7. If the movement amount in the Z direction reaches the initially set pass amount, it is determined that the pass operation has ended, and the process proceeds to step S9.

  In step S <b> 7 during the pass operation, the CPU 90 acquires the measured temperature from the thermocouple 50. Further, the CPU 90 determines whether or not the measured temperature exceeds the upper limit set temperature. If not, the pass speed is set to the initial setting speed (normal speed) (step S8). That is, if the current speed is the initial setting speed, it is left as it is. If the current speed is low, the speed is returned to the initial setting speed. The CPU 90 continues the pass operation at the pass speed set in step S8 (step S5).

  If the measured temperature exceeds the upper limit set temperature, it is determined whether or not the difference between the two exceeds a threshold value (step S10). If the threshold value is not exceeded, the CPU 90 sets the pass speed to a low speed (step S11). In this embodiment, 80% of the initial set speed is set to a low speed. The CPU 90 continues the pass operation at the pass speed set in step S11 (step S5).

  If the difference between the measured temperature and the upper limit set temperature exceeds the threshold value, the CPU 90 determines that the temperature has risen abnormally and ends the cutting process (step S13).

  If the movement amount in the Z direction reaches the initially set pass amount, it is determined that the pass operation has ended, and the process proceeds to step S9. The CPU 90 determines whether or not the number of pass operations has reached the initially set pass number (step S9). If not, the cutting operation is started again (see FIG. 2E, step S2). If the number of pass operations has reached the initially set number of passes, the CPU 90 determines that the processing is finished, and releases the threaded grinding wheel 12 from the gear 10 (engagement separation operation, step S12).

As described above, it is possible to prevent the processing part from becoming an unexpectedly high temperature.

1.7 Other
(1) In the above embodiment, the temperature is adjusted by adjusting both the cutting depth and the pass speed. However, the adjustment may be performed with only one of them. For example, if NO in step S3, the process may proceed to the cutting operation in step S2. Alternatively, if NO in step S6, the process may proceed to a pass operation in step S5.

(2) In the above embodiment, the pass speed is reduced when the measured temperature exceeds the upper limit set temperature, and the pass speed is set at the normal speed when the measured temperature falls below the upper limit set temperature. However, two upper limit set temperatures and lower limit set temperatures may be provided. In this case, if the current temperature is the normal speed, the pass speed is reduced if the measured temperature exceeds the upper limit set temperature, and if the current temperature is low, the pass speed is not switched to the normal speed until the measured temperature falls below the lower limit set temperature. To. In this way, it is possible to prevent the speed change from being complicated.

(3) In the above embodiment, even during the pass operation, the pass speed is returned from the low speed to the normal speed if the measured temperature decreases. However, if it seems that the grinding quality is affected by changing the speed during grinding, after switching the pass speed to low speed, even if the measured temperature decreases, the next cutting action or the next pass action The normal speed may not be restored.

(4) In the above embodiment, the pass speed is switched between the normal speed and the low speed. However, in step S11, a plurality of low speeds may be provided at a predetermined rate (for example, 10%) lower than the current path speed. If it does in this way, according to measured temperature, it can switch to lower speed and can prevent a temperature rise.

(5) In the above embodiment, the pass speed is adjusted depending on whether the measured temperature exceeds the upper limit set temperature. However, a history of the measured temperature from the start of the pass operation may be recorded, the temperature at the end of the pass operation may be predicted, and the pass speed may be switched based on this.

(6) In the above embodiment, for the cutting operation, the temperature is adjusted according to the cutting amount. However, the cutting speed may be switched in the same manner as the pass operation.

  For example, the cutting operation control by temperature (step S4) may be as shown in FIG. 7B. If the measured temperature exceeds the upper limit set temperature (step S42), the CPU 90 proceeds to step S43. In step S43, if the difference between the measured temperature and the upper limit set temperature does not exceed the threshold value, the CPU 90 controls the cutting speed to be low (step S45). If the difference between the measured temperature and the upper limit set temperature exceeds the threshold value, the CPU 90 ends the cutting operation and passes the operation even if the movement amount in the X direction has not reached the initial cutting amount. Migrate to

(7) In the above embodiment, the cutting amount in the cutting operation is adjusted regardless of the temperature condition in the previous pass operation. However, in the previous pass operation, if the measured temperature does not fall below the upper limit set temperature even if the pass speed is lowered, even if the measured temperature does not exceed the upper limit set temperature in step S4, the predetermined cut amount is set. The cutting operation may be terminated when the cutting amount reaches a small percentage (for example, a cutting amount of 80%), and the operation may be shifted to a pass operation.

(8) In the above embodiment, the thermocouple 50 is used as the temperature measurement unit. However, other temperature sensors may be used. For example, a sensor that measures temperature using infrared rays may be used. In this case, the temperature near the processing site can be measured in a non-contact manner. Alternatively, the vicinity of the processing site may be imaged with an infrared camera, the image analysis may be performed to identify the processing site, and the temperature may be acquired.

(9) In the above embodiment, the thermocouple 50 is provided in the housing of the work spindle motor 6. However, a thermocouple 50 may be provided on the rotating shaft 8 of the work spindle motor 6. In this case, the measurement signal from the thermocouple 50 may be transmitted to the control unit 80 by wireless communication such as Bluetooth.

(10) In the above embodiment, each means described in FIG. However, some or all of these means may be realized by a logic circuit.

(11) In the above embodiment, the case of cutting with a threaded grindstone has been described, but the present invention can also be applied to the case of using a normal grindstone.

(12) In the above embodiment, the gear grinding machine that cuts gears has been described, but the present invention can also be applied to machine tools that cut other objects.

(13) The above modification can be applied to other embodiments as long as it does not contradict its essence.

2. Second embodiment
2.1 Overall Overview In the first embodiment, the temperature is adjusted by the cutting depth and the pass speed. In the second embodiment, the temperature is adjusted by the number of rotations of the threaded grindstone.

The configuration outline, basic operation, and coolant system in the second embodiment are the same as those in the first embodiment (see FIGS. 1 to 3).

2.2 Overview of Control Unit FIG. 8 is a functional block diagram of the control unit 80 that controls the above-described units. During the pass operation, the temperature determination unit 72 determines whether or not the measured temperature of the thermocouple 50 exceeds the upper limit set temperature.

The grindstone rotation speed setting means 82 (which constitutes part of the parameter setting means) reduces the rotation speed of the screw-shaped grindstone 12 if the measured temperature exceeds the upper limit set temperature. If it does not exceed, the initial rotation speed is set. The grindstone rotation command means 84 (which constitutes a part of the cutting operation command means) controls the grinding spindle motor 16 according to the set rotational speed.

2.3 Hardware Configuration of Control Unit The hardware configuration of the control unit of the gear grinding machine in this embodiment is the same as that of the first embodiment (see FIG. 5).

2.4 Processing by Control Program FIG. 9 shows a flowchart of the control program 102. The CPU 90 displays a parameter input screen on the touch screen 94. In response to this, the operator initially sets parameters such as the pass speed, the pass amount, the cutting speed, the cutting amount, the grindstone rotation speed, the upper limit set temperature, and the number of passes (step S1). The CPU 90 records this parameter in the memory 92.

  When the start button of the touch screen 94 is pressed, the CPU 90 performs an approach operation (see FIG. 2A) of the threaded grindstone 12. When the approach operation is finished, the CPU 90 controls the grinding spindle motor 16 to rotate the screw-shaped grinding wheel 12 so that the initially set grinding wheel rotational speed is obtained. Further, the cutting operation is started at the initially set cutting speed (moving speed in the X direction) (see FIG. 2B, step S2). In the case of the cutting operation, the cutting operation control by temperature (step S4) is performed as in the first embodiment. When the cutting operation is finished, the CPU 90 starts a pass operation (step S5).

  In the pass operation, the CPU 90 moves the screw-shaped grindstone 12 in the Z direction at an initially set pass speed (see FIGS. 2C and 2D). The CPU 90 continues the path operation until it reaches a predetermined movement amount (step S6). When the pass operation ends, the CPU 90 proceeds to step S9.

  In step S <b> 7 during the pass operation, the CPU 90 acquires the measured temperature from the thermocouple 50. Further, the CPU 90 determines whether or not the measured temperature exceeds the upper limit set temperature. If not exceeded, the grindstone rotation speed is set to the initial rotation speed (normal rotation speed) (step S21). That is, if the current rotation speed is the initial setting speed, it is left as it is. The CPU 90 controls the grinding spindle motor 16 so as to rotate the threaded grindstone 12 at the rotation speed set in step S21, and continues the pass operation (step S5).

  If the measured temperature exceeds the upper limit set temperature, it is determined whether or not the difference between the two exceeds a threshold value (step S10). If the threshold value is not exceeded, the CPU 90 sets the grindstone rotation speed to a low speed (step S22). In this embodiment, the rotational speed that is 80% of the initial rotational speed is set to a low speed. The CPU 90 controls the grinding spindle motor 16 so as to rotate the threaded grindstone 12 at the rotation speed set in step S22, and continues the pass operation (step S5).

  If the difference between the measured temperature and the upper limit set temperature exceeds the threshold value, the CPU 90 determines that the temperature has risen abnormally and ends the cutting process (step S13).

  If the movement amount in the Z direction reaches the initially set pass amount, it is determined that the pass operation has ended, and the process proceeds to step S9. The CPU 90 determines whether or not the processing has been completed (step S9), and if not, executes step S2 and subsequent steps again. If it is determined that the processing has been completed, the threaded grindstone 12 is separated from the gear 10 (engagement separation operation, step S12).

As described above, the processing part can be prevented from becoming an unexpectedly high temperature.

2.5 Other
(1) In the above embodiment, both the cutting operation control and the grindstone rotational speed control are performed. However, the adjustment may be performed with only one of them. For example, if NO in step S3, the process may proceed to the cutting operation in step S2. Alternatively, if NO in step S6, the process may proceed to a pass operation in step S5.

(2) In the above embodiment, the rotational speed of the grindstone is adjusted. However, it can be implemented in combination with adjustment of the pass speed.

(3) In the above-described embodiment, if the measured temperature exceeds the upper limit set temperature, the grindstone speed is reduced, and if the measured temperature falls below the upper limit set temperature, the grindstone speed is set to normal. However, two upper limit set temperatures and lower limit set temperatures may be provided. In this case, when the current temperature is normal speed, if the measured temperature exceeds the upper limit set temperature, the wheel speed is reduced. When the current temperature is low, the wheel speed is not switched to normal until the measured temperature falls below the lower limit temperature. Like that. In this way, it is possible to prevent the rotational speed from being changed complicatedly.

(4) In the above embodiment, the grinding wheel rotation speed is returned from the low speed to the normal if the measured temperature decreases even during the pass operation. However, if it seems that changing the rotation speed during grinding will affect the grinding quality, once the rotation speed is switched to a low speed, the next cutting operation or the next pass will be performed even if the measured temperature decreases. Until the operation, the rotation speed may not be returned to normal.

(5) In the above embodiment, the rotational speed of the grindstone is switched between two levels, normal and low. However, in step S11, a plurality of low speeds may be provided at a lower speed by a predetermined ratio (for example, 10%) than the current rotation speed. If it does in this way, according to measured temperature, it can switch to lower speed and can prevent a temperature rise.

(6) In the above embodiment, the grindstone rotation speed is adjusted depending on whether the measured temperature exceeds the upper limit set temperature. However, a history of measured temperatures from the start of the pass operation may be recorded, the temperature at the end of the pass operation may be predicted, and the grindstone rotation speed may be switched based on this.

(7) In the above embodiment, each means described in FIG. However, some or all of these means may be realized by a logic circuit.

(8) In the above embodiment, the case of cutting with a screw-shaped grindstone has been described. However, the present invention can also be applied to the case of using a normal grindstone.

(9) In the above embodiment, the gear grinding machine that cuts gears has been described, but the present invention can also be applied to machine tools that cut other objects.

(10) The above modification can be applied to other embodiments as long as it does not contradict its essence.

3. Third embodiment
3.1 Overall Overview In this embodiment, the temperature is controlled by adjusting the coolant supply amount.

The configuration outline, basic operation, and coolant system in the third embodiment are the same as those in the first embodiment (see FIGS. 1 to 3).

3.2 Overview of Control Unit FIG. 10 is a functional block diagram of the control unit 80 that controls the above-described units. During the pass operation, the temperature determination unit 72 determines whether or not the measured temperature of the thermocouple 50 exceeds the upper limit set temperature.

The coolant amount setting means 86 (which constitutes part of the parameter setting means) increases the set amount of coolant to be discharged if the measured temperature exceeds the upper limit set temperature. If not exceeded, the initial set amount is used. The pump capacity command means 84 (which constitutes a part of the cutting operation command means) controls the oil supply pump 66 of the coolant system so that the set discharge amount is obtained.

3.3 Hardware Configuration of Control Unit FIG. 11 shows a hardware configuration when the control unit 80 is configured using the CPU 90. The basic configuration is the same as in the first embodiment. In this embodiment, an oil supply pump 66 (see FIG. 3) of the coolant system is also connected to the CPU 90.

3.4 Processing by Control Program FIG. 12 shows a flowchart of the control program 102. The CPU 90 displays a parameter input screen on the touch screen 94. In response to this, the operator initially sets parameters such as the pass speed, the pass amount, the cutting speed, the cutting amount, the grindstone rotation speed, the upper limit set temperature, the number of passes, and the coolant discharge amount (step S1). The CPU 90 records this parameter in the memory 92.

  When the start button on the touch screen 94 is pressed, the CPU 90 performs an approach operation (see FIG. 2A) of the threaded grindstone 12 and then performs a cutting operation (step S2). At this time, the CPU 90 controls the capability of the oil supply pump 66 so that the coolant discharge amount determined by the initial setting is obtained. Therefore, the coolant is discharged to the machining site where the gear 10 and the threaded grindstone 12 are in contact. In the case of the cutting operation, the cutting operation control by temperature (step S4) is performed as in the first embodiment.

  When the cutting operation is finished, the CPU 90 starts a pass operation (step S5). In the pass operation, the CPU 90 moves the screw-shaped grindstone 12 in the Z direction at an initially set pass speed (see FIGS. 2C and 2D). The CPU 90 continues the path operation until it reaches a predetermined movement amount (step S6). When the pass operation ends, the CPU 90 proceeds to step S9.

  In step S <b> 7 during the pass operation, the CPU 90 acquires the measured temperature from the thermocouple 50. Further, the CPU 90 determines whether or not the measured temperature exceeds the upper limit set temperature. If not, the coolant supply amount is set to the initial set amount (normal supply amount) (step S31). That is, if the present is the initial set amount, it is left as it is, and if the present is the increased supply amount, it is returned to the initial set amount. The CPU 90 controls the oil supply pump 66 so as to perform the grinding process with the coolant supply amount set in step S31, and continues the pass operation (step S5).

  If the measured temperature exceeds the upper limit set temperature, it is determined whether or not the difference between the two exceeds a threshold value (step S10). If the threshold value is not exceeded, the CPU 90 sets the coolant supply amount to an increased amount (step S32). In this embodiment, the supply amount increased by 150% of the initial set amount. The CPU 90 controls the oil supply pump 66 so as to perform the grinding process with the increased coolant supply amount set in step S32, and continues the pass operation (step S5).

  If the difference between the measured temperature and the upper limit set temperature exceeds the threshold value, the CPU 90 determines that the temperature has risen abnormally and ends the cutting process (step S13).

  If the movement amount in the Z direction reaches the initially set pass amount, it is determined that the pass operation has ended, and the process proceeds to step S9. The CPU 90 determines whether or not the processing has been completed (step S9), and if not, executes step S2 and subsequent steps again. If it is determined that the processing has been completed, the threaded grindstone 12 is separated from the gear 10 (engagement separation operation, step S12).

As described above, the processing part can be prevented from becoming an unexpectedly high temperature.

1.7 Other
(1) In the above embodiment, both the cutting operation control and the coolant supply amount control are performed. However, the adjustment may be performed with only one of them. For example, if NO in step S3, the process may proceed to the cutting operation in step S2. Alternatively, if NO in step S6, the process may proceed to a pass operation in step S5.

(2) In the above embodiment, the coolant supply amount is adjusted. However, it can be implemented in combination with adjustment of the pass speed.

(3) In the above embodiment, the coolant supply amount is increased if the measured temperature exceeds the upper limit set temperature, and the coolant supply amount is made normal if the measured temperature falls below the upper limit set temperature. However, two upper limit set temperatures and lower limit set temperatures may be provided. In this case, if the current temperature is normal and the measured temperature exceeds the upper limit set temperature, the coolant supply amount is increased. Do not switch to. In this way, it is possible to prevent the supply amount from being changed complicatedly.

(4) In the above embodiment, the coolant supply amount is switched between the normal amount and the increase amount. However, in step S32, the increased supply amount may be provided in a plurality of stages so as to be increased by a predetermined ratio (for example, 50%) from the current supply amount. If it does in this way, according to measured temperature, it can increase more and can prevent a temperature rise.

(5) In the above embodiment, the coolant amount is adjusted depending on whether the measured temperature exceeds the upper limit set temperature. However, a history of measured temperature from the start of the pass operation may be recorded, a temperature at the end of the pass operation may be predicted, and the coolant amount may be switched based on this.

(6) In the above embodiment, no adjustment is made in the cutting operation. However, the coolant supply amount may be switched in the same manner as the pass operation.

(7) In the above embodiment, the coolant supply amount is adjusted. However, instead of or in addition to this, liquid nitrogen may be mixed into the coolant. In this case, when the measured temperature exceeds the upper limit set temperature, the parameter for determining whether to mix liquid nitrogen is set to “present”, the supply valve 43 shown in FIG. 13 is controlled by the CPU 90, and the supply valve 43 is opened. Thereby, the liquid nitrogen from the liquid nitrogen tank 41 is mixed with the coolant. Moreover, you may make it adjust the mixing amount of liquid nitrogen.

  In the above embodiment, if the difference between the measured temperature and the upper limit set temperature exceeds the threshold value, the process ends abnormally (step S13). However, the temperature may be lowered by mixing liquid nitrogen with the coolant without abnormal termination.

  A coolant other than liquid nitrogen may be mixed with the coolant.

(8) In the above embodiment, the temperature is measured by a thermocouple. However, as shown in FIG. 14, impurities generated by a thermal change (or having a higher concentration) may be measured by the impurity sensor 61 for the coolant after passing through the processing site. The CPU 90 estimates the temperature of the processing site based on the presence or absence (or impurity concentration) of this impurity. For example, a table indicating the correspondence between the impurity concentration and the estimated temperature may be recorded in advance.

(9) In the above embodiment, each means described in FIG. However, some or all of these means may be realized by a logic circuit.

(10) In the above embodiment, the case of cutting with a screw-shaped grindstone has been described. However, the present invention can also be applied to the case of using a normal grindstone.

(11) In the above embodiment, a gear grinding machine that cuts gears has been described, but the present invention can also be applied to machine tools that cut other objects.

(12) The above modification can be applied to other embodiments as long as it does not contradict its essence.

Claims (16)

A workpiece holding section for holding a workpiece to be ground;
A grindstone holding unit for rotatably holding a grindstone for cutting the workpiece held by the workpiece holding unit;
A grindstone rotation drive unit that rotates the grindstone held by the grindstone holding unit;
A grindstone moving unit that moves the grindstone held by the grindstone holding unit with respect to the workpiece;
A control unit for controlling the grindstone rotation driving unit and the grindstone moving unit so as to cut the workpiece by the grindstone;
A coolant discharger that discharges the coolant to a machining site of the workpiece by the grindstone;
A grinding machine comprising:
A temperature measurement unit is provided for measuring the coolant at the machining site or the temperature of the coolant that has passed through the machining site,
When the temperature measured by the temperature measurement unit exceeds a predetermined temperature, the control unit at least (i) the grindstone cuts the workpiece so that the measured temperature does not exceed the predetermined temperature. (Ii) After the grindstone cuts across the workpiece, and then cuts across the workpiece in the opposite direction, the grindstone is directed toward the center of the workpiece. A grinding machine characterized by adjusting one of the distances to be moved. The grinding machine of claim 1,
The work holding part is to hold the work so as to be rotatable by a rotating shaft,
The temperature measuring unit is provided on a rotating shaft of the work holding unit,
The grinding machine characterized in that the measured temperature data of the temperature measuring unit is transmitted to the control unit by wireless communication. The grinding machine of claim 1,
The said temperature measurement part is provided with the non-contact temperature measurement sensor which measures the temperature of the said coolant non-contactingly, The grinding machine characterized by the above-mentioned. The grinding machine of claim 1,
The grinding machine according to claim 1, wherein the temperature measuring unit estimates a coolant temperature at the processing site based on an impurity concentration contained in the coolant that has passed through the processing unit. In the grinding machine in any one of Claims 1-4,
The said control part further adjusts the rotation speed which the said grindstone cuts the said workpiece | work, The grinding machine characterized by the above-mentioned. In the grinding machine in any one of Claims 1-5,
The said control part further adjusts the coolant quantity discharge | released to the said process site | part, The grinding machine characterized by the above-mentioned. In the grinding machine in any one of Claims 1-6,
Further comprising a mixing section for mixing a coolant with the coolant discharged to the processing site;
The control unit further adjusts the measured temperature of the coolant to be lower than a predetermined temperature depending on whether or not a coolant is mixed with the coolant. A control program for realizing a control unit of a grinding machine by a computer,
A temperature determination means for acquiring a measured temperature from a temperature measuring unit for measuring a coolant of a machining site or a coolant that has passed through the machining site, and determining whether the measured temperature exceeds a predetermined temperature;
When it is determined that the measured temperature exceeds a predetermined temperature, at least (i) a speed at which the grindstone reciprocates across the workpiece while cutting the workpiece, and (ii) the grindstone crosses the workpiece. Parameter setting means that adjusts any of the distances that move the grindstone toward the center of the workpiece and sets it as a parameter before cutting across the opposite direction after cutting
A control program for functioning as a cutting operation command means for executing a cutting operation based on a set parameter. Hold the workpiece to be ground,
Holds the grindstone that cuts the held workpiece rotatably,
Rotate the grindstone held by the grindstone holding part,
Moving the grindstone held by the grindstone holding portion relative to the workpiece;
Controlling the rotation and movement of the grindstone to cut the workpiece by the grindstone,
A grinding method for discharging a coolant to a work site of the workpiece by the grindstone,
Measure the temperature of the coolant at the machining site or the coolant that has passed through the machining site,
When the measured temperature exceeds a predetermined temperature, at least (i) the grindstone cuts the workpiece and reciprocates and crosses the workpiece so that the measured temperature does not exceed the predetermined temperature. Speed, (ii) after the grindstone cuts across the workpiece, and then adjusts either of the distances to move the grindstone toward the center of the workpiece before cutting across the opposite direction A grinding method characterized by the above. A workpiece holding section for holding a workpiece to be ground;
A grindstone holding unit for rotatably holding a grindstone for cutting the workpiece held by the workpiece holding unit;
A grindstone rotation drive unit that rotates the grindstone held by the grindstone holding unit;
A grindstone moving unit that moves the grindstone held by the grindstone holding unit with respect to the workpiece;
A control unit for controlling the grindstone rotation driving unit and the grindstone moving unit so as to cut the workpiece by the grindstone;
A coolant discharger that discharges the coolant to a machining site of the workpiece by the grindstone;
A grinding machine comprising:
A temperature measurement unit is provided for measuring the coolant at the machining site or the temperature of the coolant that has passed through the machining site,
When the temperature measured by the temperature measuring unit exceeds a predetermined temperature, the control unit adjusts the amount of coolant discharged to the processing site so that the measured temperature does not exceed the predetermined temperature. A grinding machine characterized by The grinding machine of claim 10,
Further comprising a mixing section for mixing a coolant with the coolant discharged to the processing site;
The control unit further adjusts the measured temperature of the coolant to be lower than a predetermined temperature depending on whether or not a coolant is mixed with the coolant. A control program for realizing a control unit of a grinding machine by a computer,
A temperature determination means for acquiring a measured temperature from a temperature measuring unit for measuring a coolant of a machining site or a coolant that has passed through the machining site, and determining whether the measured temperature exceeds a predetermined temperature;
When it is determined that the measured temperature exceeds a predetermined temperature, parameter setting means for adjusting the amount of coolant discharged to the processing site and setting it as a parameter;
A control program for functioning as a cutting operation command means for executing a cutting operation based on a set parameter. Hold the workpiece to be ground,
Holds the grindstone that cuts the held workpiece rotatably,
Rotate the grindstone held by the grindstone holding part,
Moving the grindstone held by the grindstone holding portion relative to the workpiece;
Controlling the rotation and movement of the grindstone to cut the workpiece by the grindstone,
A grinding method for discharging a coolant to a work site of the workpiece by the grindstone,
Measure the temperature of the coolant at the machining site or the coolant that has passed through the machining site,
When the measured temperature exceeds a predetermined temperature, the amount of coolant discharged to the machining site is adjusted so that the measured temperature does not exceed the predetermined temperature. A workpiece holding section for holding a workpiece to be ground;
A grindstone holding unit for rotatably holding a grindstone for cutting the workpiece held by the workpiece holding unit;
A grindstone rotation drive unit that rotates the grindstone held by the grindstone holding unit;
A grindstone moving unit that moves the grindstone held by the grindstone holding unit with respect to the workpiece;
A control unit for controlling the grindstone rotation driving unit and the grindstone moving unit so as to cut the workpiece by the grindstone;
A coolant discharger that discharges the coolant to a machining site of the workpiece by the grindstone;
A grinding machine comprising:
A temperature measurement unit is provided for measuring the coolant at the machining site or the temperature of the coolant that has passed through the machining site,
When the temperature measured by the temperature measurement unit exceeds a predetermined temperature, the control unit mixes the coolant with the coolant so that the measured temperature does not exceed the predetermined temperature. Grinding machine. A control program for realizing a control unit of a grinding machine by a computer,
A temperature determination means for acquiring a measured temperature from a temperature measuring unit for measuring a coolant of a machining site or a coolant that has passed through the machining site, and determining whether the measured temperature exceeds a predetermined temperature;
When it is determined that the measured temperature exceeds a predetermined temperature, parameter setting means for setting as a parameter whether or not to mix a coolant with the coolant;
A control program for functioning as a cutting operation command means for executing a cutting operation based on a set parameter. Hold the workpiece to be ground,
Holds the grindstone that cuts the held workpiece rotatably,
Rotate the grindstone held by the grindstone holding part,
Moving the grindstone held by the grindstone holding portion relative to the workpiece;
Controlling the rotation and movement of the grindstone to cut the workpiece by the grindstone,
A grinding method for discharging a coolant to a work site of the workpiece by the grindstone,
Measure the temperature of the coolant at the machining site or the coolant that has passed through the machining site,
A grinding method, wherein when the measured temperature exceeds a predetermined temperature, a coolant is mixed with the coolant so that the measured temperature does not exceed the predetermined temperature.