JP2002182714A - Work operation stopping method for machine tool and working controller performing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To retreat a tool from a work and to speedily stop a grinding machine without damaging the work and a device even if a power failure occurs. SOLUTION: In the working controller, a wheel spindle stock 32 and a main shaft 31 are numerically controlled and the work is worked by a grinding wheel. When a power failure detecting part 40 detects the power failure, the grinding wheel is retreated from the work and the grinding machine is stopped within little time until a control operation by the working controller becomes impossible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for stopping a machining operation in a grinding machine or the like and a machining control device therefor.

[0002]

2. Description of the Related Art In recent grinders, a control system is provided with a numerical control unit, which performs numerical control in order to perform precision machining on a work. That is, the rotating grinding wheel is relatively moved with respect to the workpiece along a locus controlled numerically, and the workpiece is ground by the grinding wheel. However, in order to grind, for example, a pin portion using a camshaft or a journal of a crankshaft as a rotation axis by using a conventional grinder equipped with a numerical control unit, it is necessary to grind while moving the grindstone table back and forth with respect to the work. is there. Therefore, when a power failure occurs, if the timing of stopping the main shaft that rotationally drives the workpiece and the timing of stopping the grinding wheel head that moves the grinding wheel forward and backward do not match, the grinding wheel bites into the workpiece and breaks the workpiece or the machine. There was a fear. In such a grinding machine, an uninterruptible power supply device is provided for stopping by a simple dynamic brake circuit with a relay linked to a power failure or as a measure against a power failure. In the event of a power failure, a dynamic brake is applied to the spindle rotation drive motor by the numerical controller backed up by the uninterruptible power supply, and a mechanical drive other than the spindle rotation drive motor is driven by the use of a regenerative resistor or mechanical brake. It was stopped quickly.

[0003]

However, the uninterruptible power supply is not only expensive but also requires large equipment.
The present invention is an apparatus having a tool for performing processing in contact with a work such as a grinder. For example, even if a power failure occurs, the control device does not require an uninterruptible power supply which is a large facility, and damages the machine and the work. An object of the present invention is to provide a machining operation stopping method for retreating a tool from a workpiece without a tool, and a machining control device.

[0004]

Means for Solving the Problems and Effects of the Invention In order to solve the above problems, the invention according to claim 1 performs machining by synchronously driving a workpiece that is held by a spindle and rotates and a tool that advances and retreats. In a control device for controlling a machining operation of a machine tool to be applied in accordance with machining trajectory profile data, a power reduction detecting means for detecting a power failure or a decrease in power supplied to the control device, and a tool for retracting the tool from the work A tool evacuation calculation formula storage unit that stores data based on the evacuation calculation formula is provided, and when the power failure or the decrease in power is detected, the spindle is decelerated and the tool evacuation calculation data is stored in the machining path profile data. The processing locus profile obtained by adding the data based on the equation and adding the tool within the time until the control operation by the control device becomes impossible. It is retracted in synchronization with the rotation of the main spindle from the workpiece and summarized in that stopping the machine tool from the based on Rudeta.

By adopting such a machining operation stopping method, when a power failure or a drop in power is detected by the power drop detection means, data based on a tool retraction calculation formula is added to the machining locus profile data. Then, the tool is evacuated from the workpiece within a time until the control operation by the control device becomes impossible due to the power supply drop, and thereafter, the machine tool stops. Therefore, even if there is a power failure, it is possible to prevent the work and the machine tool from being damaged. Therefore, the uninterruptible power supply which has been required conventionally becomes unnecessary.

According to a second aspect of the present invention, there is provided a control device for controlling a machining operation of a machine tool for performing machining by synchronously driving a workpiece that is rotated by being held by a spindle and a tool that advances and retreats in accordance with machining path profile data. Input means for inputting a device stop instruction for stopping the processing operation,
Tool evacuation calculation formula storage means for storing data based on a tool evacuation calculation formula for evacuation of the tool from the work is provided, and when the apparatus stop instruction is input, the spindle is decelerated, and The data based on the tool retraction calculation formula is added to the processing path profile data, and the tool is added from the workpiece based on the processing path profile data obtained by adding the tool within a time until a slight control operation by the control device becomes impossible. The gist is that the machine tool is stopped after being retracted in synchronization with the rotation of the main shaft.

[0007] With such a processing operation stopping method, when a device stop instruction is input from the input means,
Data based on the tool retraction calculation formula is added to the processing locus profile data, and the tool is retracted from the workpiece within a predetermined time. Then, thereafter, the machine tool stops.
Therefore, for example, even if an instruction such as an emergency stop is input, the tool smoothly and promptly separates from the workpiece and stops.
It can stop quickly without damaging the work or machine tool.

According to a third aspect of the present invention, in any one of the first and second aspects, the data based on the tool retraction calculation formula to be added to the machining trajectory profile data is obtained by setting a feed speed of a tool to the workpiece for a predetermined time. The gist is that the data is speeding up and decelerating within.

By adopting such a machining operation stopping method, by adding data based on the tool retraction calculation formula to the machining trajectory profile data, when a power failure or a drop in power is detected, or a device stop instruction is input. The retracting speed of the tool when it is moved gradually changes. As a result, there is no sudden change in the speed of the removal of the tool during machining, and damage to the device can be prevented.

According to a fourth aspect of the present invention, there is provided a control device for controlling a machining operation of a machine tool for performing machining by synchronously driving a workpiece held and rotated by a spindle and a tool moving forward and backward in accordance with machining trajectory profile data; Alternatively, the control device includes a power-supply-drop detecting unit that detects a drop in power supplied to the control device, and a tool-evacuation-calculation-formula storage unit that stores data based on a tool-evacuation calculation formula for retracting the tool from the workpiece. The control device, when the power failure or the power drop is detected by the power drop detection means, decelerates the spindle and adds data based on the tool retraction calculation formula to the machining trajectory profile data. Based on the processing locus profile data obtained by adding the tool within the time until the control operation by the device becomes impossible, Is retracted in synchronization with the rotation of the main shaft and the gist that a configuration for stopping the machine tool from.

By adopting such a configuration, the machining operation of the machine tool is controlled by the control device according to the machining trajectory profile data. Here, when a power failure or a drop in the power supplied to the control device is detected by the power drop detection means, data based on the tool retraction calculation formula stored in the tool retraction calculation formula storage means is used as processing path profile data. Is added to Then, within a short time until the control operation of the control device becomes impossible due to the power supply drop, the tool is retracted from the work under the control of the control device,
After the tool is retracted, the machine tool stops. Therefore, even if there is no uninterruptible power supply, the tool can be separated from the work and stopped, and the work or the machine can be prevented from being damaged.

According to a fifth aspect of the present invention, there is provided a control device for controlling a machining operation of a machine tool for performing a machining by synchronously driving a workpiece held and rotated by a spindle and an advancing / retreating tool in accordance with machining trajectory profile data; Input means for inputting a device stop instruction for stopping operation, and tool retraction calculation formula storage means for storing data based on a tool retraction calculation formula for retreating the tool from the work, the control device comprising: When the device stop instruction is input,
While decelerating the spindle, add data based on the tool retraction calculation formula to the machining path profile data,
The gist is such that the tool is retracted from the work in synchronization with the rotation of the spindle within a short time based on the added processing path profile data, and then the machine tool is stopped.

By adopting such a configuration, the processing operation of the machine tool is controlled by the control device according to the processing locus profile data. Here, when a device stop instruction is input from the input means, data based on the tool retraction calculation formula stored in the tool retraction calculation formula storage means is added to the processing path profile data, and the tool is moved within a short time. And the machine tool stops after the tool is retracted. Therefore, even if there is no uninterruptible power supply, for example, even in the case of an emergency stop, the tool can be separated from the work and stopped, and the work or the machine device can be prevented from being damaged.

According to a sixth aspect of the present invention, in the method of any one of the fourth and fifth aspects, the data based on the tool retraction formula to be added to the machining trajectory profile data is obtained by setting the feed speed of the tool to the workpiece for a predetermined time. The gist is that the data is to be accelerated and decelerated.

By adopting such a configuration, the relative speed of the tool with respect to the workpiece when a power failure or a drop in power is detected, or when a device stop instruction is input, is reduced.
It gradually changes. This eliminates a sudden change in speed, prevents the occurrence of an impact due to the change in speed, and prevents damage to the device.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A machining control device and a machining operation method according to a first embodiment of the present invention will be described below with reference to FIGS.

This processing control device controls a grinding machine which is a machine tool using a grinding wheel as a tool.
As shown in FIG. 1, power supply units 11 and 12 for receiving power from a power supply unit 10 and converting the power to a control power supply are provided. A numerical controller 20 as a control device is connected to the power supply unit 11. The numerical controller 20 is operated by the control power converted by the power supply unit 11. A servo controller 30 is connected to the power supply unit 12, and the power converted by the power supply unit 12 is supplied to the servo controller 30. A motor 31a is connected to the servo controller 30. The rotation of a main shaft 31 for rotating a work described later is controlled by the motor 31a. Further, a motor 32a is connected to the servo controller 30. The motor 32a controls the advance / retreat movement of the wheel head 32 described later. The wheel head 32 is attached to a base 61 of the machine tool. In a grinding machine that forms a curved surface such as a cam, by synchronously driving the spindle 31 and the grinding wheel base 32, the workpiece and the grinding wheel relatively move to form a curved surface.

Numerical control unit 20, as shown in FIG.
A PU (Central Processing Unit) 21, an input / output unit (I / O) 22, a ROM (Read Only Memory) 23 constituting a tool evacuation calculation formula storage unit, and a RAM (Random A)
ccess memory) 24, which are connected by a bus B. The bus B is further connected to the servo controller 30. The ROM 23 stores a program for controlling the entire numerical controller 20 and data based on a later-described evacuation calculation formula. In the RAM 24,
Processing locus profile data including speed control data of the spindle 31 and position control data of the grinding wheel head 32 is stored.

Power supply units 11 and 12, numerical control unit 20
And a machining control device including the servo controller 30 includes:
Further, a power failure detection unit 40 as a power drop detection unit,
An emergency stop button 41 and an interruption button 42 are provided as instruction input means for inputting an instruction to stop the apparatus. The power failure detection unit 40 detects a power failure, and
To the input / output unit 22 of the numerical control unit 20
To be sent to. The emergency stop button 41
This is for instructing an emergency stop of the grinding machine itself. The interruption button 42 is for instructing interruption of grinding. The emergency stop button 41 and the interruption button 42 are connected to the input / output unit 22 of the numerical control unit 20.

Next, the basic operation of the grinding machine having the configuration shown in FIG. 1 will be described. When performing a desired grinding on the work, the CPU 21 in the numerical control unit 20 reads the main shaft 31 from the RAM 24.
The speed control data and the position control data of the grinding wheel head 32 are read out. The speed control data instructs the rotation speed of the main shaft 31 at each time in order to perform the grinding of the work. The position control data instructs the position of the grindstone base 32 based on the rotation angle of the spindle. The CPU 21 generates a control signal and transmits the control signal to the servo controller 30 so that the spindle 31 and the wheel head 32 operate synchronously based on the speed control data and the position control data. The servo controller 30 synchronously drives the spindle 31 and the grinding wheel head 32 according to the control signal. Thereby, the grinding wheel relatively moves with respect to the rotation position of the work, and the grinding wheel comes into contact with the work and grinds the work.

The above is the operation when the normal grinding is performed. The processing control device shown in FIG. 1 is designed to stop the device without damaging the work or the grinding machine even if a power failure occurs. 3
Steps S11 to S15 are performed.

In step S11, the power failure detecting section 40
Monitors the voltage output by the power supply unit 10 and detects whether a power failure has occurred. The power failure detection unit 40 includes the power supply unit 1
0 outputs normal power, for example, “H
(High) signal, and outputs a "L (Low)" signal when the voltage of the power supply drops due to a power failure. If a power failure occurs (YES), the power failure has occurred. From the power failure detection unit 40 to the numerical control unit 20
Given to. By the way, even in the case of a power failure, the power supply units 11 and 12 have a capacitor having a power supply capacity that enables the processing control device to operate for a short time. For this reason, a power supply that attenuates at a time constant determined by the power supply capacity is supplied to the numerical control unit 20. Therefore, even immediately after the occurrence of the power failure, the controllable power source is supplied to the numerical control unit 20 until the elapsed time from the occurrence of the power failure is, for example, about 150 ms.

The numerical control unit 20 determines whether or not the workpiece is being ground by the grinding wheel in step S12 during a short predetermined time until the control operation becomes impossible due to the power failure. (YES), in step S13, data based on the retraction calculation formula is added to the processing locus profile data.

As shown in FIG. 4A, for example, a position trajectory 50 is provided to the machining trajectory profile data such that the grinding wheel is moved forward (positive direction) and then moved backward (negative direction) with respect to the workpiece. Can be The vertical axis of the graph represents the rotation center of the work as the origin (0 position). In contrast,
The position data based on the evacuation calculation formula is calculated from, for example, a linear expression, and as shown in FIG. 4B, a position trajectory 51 that causes the grinding wheel to move backward linearly with respect to time is given.

Here, an example of an actual machine will be described. The machining device 60 shown in FIG. 5 processes a crankshaft 70, and a moving table 62 is supported on a base 61 via a guide rail 80 so as to be movable in the left-right direction. One main shaft 3 is provided on the upper surface of one side of the moving table 62.
A headstock 63 for rotatably supporting the spindle 1 is fixedly arranged, and a headstock 64 for rotatably supporting the other spindle 31 on the upper surface on the other side is movably supported on the moving table 62 via guide rails 81. Have been. Double headstock 63,
Chucks 65 are provided at the opposite end portions of each of them via an indexing device.
0 are detachably gripped at both ends.
The crankshaft 70 is formed by connecting a plurality of journals 71 and a plurality of crankpins 72 alternately by a crank arm 73.

A mechanism for rotating the crankshaft 70 about the journal 71 is provided in the headstocks 63 and 64, and the moving table 62 is indexed with respect to the grindstone 32 to rotate the selected crankpin 72. Let it.

On the other hand, the grindstone table 32 is supported on the rear upper surface of the base 61 via a guide rail 82 so as to be movable in the front-rear direction perpendicular to the moving direction of the moving table 62. A grindstone head 67 is rotatably supported on a side surface of the grindstone table 32, and a grindstone wheel 68 is attached to a tip end thereof.

When grinding the selected crankpin 72 of the crankshaft 70 with such a machine tool, as shown in FIGS. 6 (a) and 6 (b),
With the rotation direction of 0, the crank pin 72 rotates about the journal 71 as the center of rotation. The grinding wheel 68 moves forward and backward with respect to the crankpin 72 to grind the crankpin 72. Specifically, when the crank pin 72 rotates in a direction away from the grinding wheel 68, the grinding wheel 68
When the crank pin 72 rotates in a direction approaching the grinding wheel 68, the grinding wheel 68 moves backward in synchronization with the rotation (FIG. 6B). ),
The crank pin 72 is ground into a predetermined shape.

If a power failure occurs at time t0 when the machining locus profile data shown in FIG. 4A starts to be advanced, when the spindle 31 is decelerated and data based on the evacuation calculation formula is added, the addition result becomes 4 (c). When a power failure occurs at the time t1 of the processing locus profile data in FIG. 4A, when the main shaft 31 is decelerated and the evacuation profile data is added, the addition result becomes a locus 53 shown in FIG. 4D. . Further, when a power failure occurs at time t2 when the reverse is to be started and data based on the evacuation calculation formula is added, the addition result becomes
The position locus 54 shown in FIG.

In any case, after the occurrence of the power failure, the locus of the grinding wheel 68 withdraws from the work being ground with the passage of time. That is, as shown in FIG. 6A, when the grinding wheel 68 advances with respect to the crankshaft 70,
Since the forward speed is lower than the pre-programmed forward speed determined by the machining path profile data,
It is relatively separated from the crankpin 72. FIG.
As shown in (b), when the grinding wheel 68 retreats, its speed becomes faster than the retreat speed programmed in advance determined by the processing trajectory profile data, so that it comes away from the crank pin 72 to approach.

The CPU 21 transmits a control signal corresponding to the addition result to the servo controller 30, and the servo controller 30 executes step S based on the given control signal.
At 14, the operations of the spindle 31 and the grinding wheel stand 32 are controlled, and the grinding wheel 68 and the work are relatively retracted. Further, the servo controller 30 controls the motors 31a and 32a that have been driving the spindle 31 and the grinding wheel head 32 after the deceleration of the spindle 31 and the retracting operation of the grinding wheel head 32, respectively. The motors 31a and 32a are stopped. The energy for retracting the grindstone table 32 for moving the grinding wheel 68 from the workpiece is the regenerative energy generated when the motor for driving the spindle 31 and the power supply stored in the condenser in the circuit is decelerated. The rotation of the grinding wheel 68 naturally stops when the power supply is stopped. As described above, the whole apparatus stops in a state where the grinding wheel is retracted from the work and is separated by, for example, about 10 mm.

On the other hand, if it is determined in step S12 that the grinding wheel is not grinding the work, the motor for driving each of the spindles 31 and the grinding wheel head 32 is numerically controlled without retreating the grinding wheel to attenuate. And stop.

The series of processing in steps S11 to S15 is processing for retracting the grinding wheel from the work and stopping the apparatus immediately after the occurrence of a power failure in step S11. In the case of interruption, the device is similarly stopped. That is, in step S11, the CPU
21 indicates that the output signal of the power failure detection unit 40 is changed from “H” to “L”.
Is determined to be a power failure, but the signal of “L” is also supplied to the CPU 21 similarly to step S11 when the button 41 or the button 42 is pressed. Thereafter, the same processing as in FIG. 2 from step S12 to step S15 is performed, and the apparatus stops with the grinding wheel retracted from the work.

In the first embodiment, the following features can be obtained. A power failure detection unit 40 that monitors the power supplied from the power supply unit 10 and detects a power failure is provided. The numerical control unit 20 stops the power supply within a short time until the control operation immediately after the power failure is detected becomes impossible. Without switching to a specially prepared program such as an emergency program at the time, the grinding wheel is evacuated from the work by the running program, so even if you do not have an uninterruptible power supply, you can Stops smoothly and safely.

Add the data based on the evacuation calculation formula to the machining locus profile data of the working machining program,
Since the spindle 31 and the grindstone base 32 are numerically controlled in accordance with the addition result, the grindstone wheel 68 can be gradually retracted from the work and separated to an appropriate distance.

The buttons 41 and 42 are provided to allow the grinding wheel 68 to be smoothly retracted from the work in the case of an emergency stop or interruption of the grinding, as in the case of a power outage. No damage.

[Second Embodiment] A machining operation stopping method according to a second embodiment of the present invention will be described below with reference to FIG.

In FIG. 4B of the first embodiment,
The evacuation profile data is the data of the position trajectory for linearly moving the grinding wheel 68 backward with the passage of time.
However, at the moment when the grinding wheel 68 is released from the work,
Rapid changes in speed can impact the device. To avoid this, if the speed at which the grinding wheel 68 is moved backward is reduced (when the gradient of the straight line is reduced), sufficient retreat may not be realized before the apparatus stops.
In the present embodiment, as shown in FIG. 7, the position data based on the evacuation calculation formula is expressed by a locus 8 represented by a quadratic function formula.
3 is assumed.

The trajectory 83 indicates that the predetermined evacuation time is T (for example, 100 ms) and the rated acceleration of the servo motor drive is a.
Then, the evacuation speed v from time 0 to T / 2 is represented by a · t
Until the time changes from T / 2 to T, the retreat speed v is set to −a (t−T). The saving amount x from time 0 to T / 2 is x = １ ／ at · t ² , and time T /
At 2, the total evacuation amount X is １ ／ at ² . Time T /
2 is X−1 / 2a (t−T) ² . FIG. 8 shows this locus 83 as position data. This retreat locus 83 is added to the processing profile data. As a result, the relative speed at which the grinding wheel 68 is retracted from the work has an acceleration with less impact.

As described above, by including the acceleration component in the data based on the evacuation calculation formula, the machining control device of FIG. 1 performs the same process as the processes S11 to S15 of FIG. The speed change when leaving the vehicle is small. Therefore, the grinding wheel 68 can be separated from the work by, for example, about 10 mm a sufficient distance thereafter without giving an impact to the apparatus.

[Another Embodiment] The above embodiment may be modified as follows. In the first and second embodiments, the grinding machine has been described. On the other hand, not only for the grinding machine, but also for a control system of a cutting device, an excavating device, etc., which controls the operation of a tool based on the processing path profile data and processes the workpiece in synchronization with the work by the tool, the same stopping method is used. The same effect as in the above embodiment can be obtained by using.

Even in a processing control device other than a grinding machine that performs numerical control by the numerical control unit 20, the whetstone head is retracted from the work and the device is stopped within a period in which effective power is supplied, so that the A power failure power supply is not required, and damage to the device and the work can be prevented.

If a circuit or the like for detecting a voltage drop is mounted in place of the power failure detection unit 40, the device can be controlled before the synchronization control becomes unstable due to a decrease in the voltage output from the power supply unit 10. Can be stopped.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a processing control device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a numerical control unit 20 in FIG. 1;

FIG. 3 is a flowchart showing a machining operation stopping method performed by the machining control device of FIG. 1;

FIG. 4 is an explanatory diagram of processing locus profile data and data based on an evacuation calculation formula.

FIG. 5 is a plan view showing an example of a machine tool.

FIG. 6 is an explanatory diagram of an evacuation operation.

FIG. 7 is an explanatory diagram of a calculation formula showing a second embodiment of the present invention.

FIG. 8 is an explanatory diagram of data based on save data.

[Explanation of symbols]

Reference numeral 10: power supply, 20: numerical control unit as numerical control means, 2
1 CPU, 22 input / output unit, 23 ROM, 24 R
AM, 30... A servo controller as processing control means, 40... A power failure detection unit as power drop detecting means.

Claims (6)

[Claims] 1. A control device for controlling a machining operation of a machine tool for performing a machining by synchronously driving a workpiece held and rotated by a main shaft and a tool moving forward and backward according to machining trajectory profile data, wherein a power failure or supply to the control device is provided. A power drop detecting means for detecting a drop in the power to be supplied, and a tool retreat calculation formula storage means for storing data based on a tool retraction calculation formula for retreating the tool from the work, wherein the power failure or When detecting a drop in power supply, the spindle is decelerated, and data based on the tool retraction calculation formula is added to the machining path profile data, and the tool is controlled within a time period until the control operation by the control device becomes impossible. Is retracted from the workpiece in synchronization with the rotation of the spindle based on the processing locus profile data obtained by adding the Machining operation stopping method for causing the machine to stop. 2. A control device for controlling a machining operation of a machine tool that performs machining by synchronously driving a workpiece held and rotated by a spindle and a tool that advances and retreats in accordance with machining trajectory profile data. Input means for inputting an apparatus stop instruction, and tool evacuation equation storage means for storing data based on a tool evacuation equation for evacuation of the tool from the work are provided, and the apparatus stop instruction is input. Sometimes, while decelerating the main spindle, adding data based on the tool retraction calculation formula to the machining path profile data, and adding the tool within the time until the control operation by the control device becomes impossible. The machine tool is stopped after being retracted from the work in synchronization with the rotation of the spindle based on the profile data. Machining operation stopping method according to claim. 3. The data based on the tool retraction calculation formula to be added to the machining trajectory profile data is data for increasing or decreasing a feed speed of a tool with respect to the workpiece within a predetermined time. The method according to claim 1 or 2, wherein the processing operation is stopped. 4. A control device for controlling a machining operation of a machine tool for performing machining by synchronously driving a workpiece held and rotated by a spindle and a reciprocating tool in accordance with machining trajectory profile data, and a power failure or supply to the control device. Power control drop detecting means for detecting a drop in the power supply to be performed, and tool retraction calculation formula storage means for storing data based on a tool retraction calculation formula for retreating the tool from the work. When the power failure or the power drop is detected by the power drop detection means, the spindle is decelerated, and data based on the tool retraction calculation formula is added to the machining trajectory profile data. Within the time until the rotation of the main spindle from the workpiece based on the processing locus profile data obtained by adding the tool. Machining control device being characterized in that a configuration for stopping the machine tool by al retracted. 5. A control device for controlling a machining operation of a machine tool that performs machining by synchronously driving a workpiece held and rotated by a spindle and a tool that advances and retreats according to machining trajectory profile data, and a control device for stopping the machining operation. Input means for inputting a device stop instruction, and tool retraction calculation formula storage means storing data based on a tool retraction calculation formula for retreating the tool from the work, wherein the control device is configured such that the device stop instruction is When input, the spindle is decelerated, data based on the tool retraction calculation formula is added to the machining path profile data, and the workpiece is determined based on the added machining path profile data within a predetermined time. A machining control device wherein the machine tool is stopped after being retracted in synchronism with the rotation of the main shaft. 6. The data based on the tool retraction calculation formula to be added to the machining trajectory profile data is data for increasing and decreasing a feed speed of a tool with respect to the workpiece. 5. The processing control device according to 5.