JP6334775B2 - Processing apparatus, control method thereof, and program - Google Patents

Description

The present invention relates to a machining apparatus, a control method thereof, and a program for executing the control method.

In recent years, in a grinding apparatus that grinds a work piece (also called “work”) with a rotating grindstone, the relative movement speed between the grindstone and the work piece is increased by increasing or decreasing the load between the work piece and the grindstone. There has been disclosed a grinding apparatus that adjusts and provides suitable results (see Patent Document 1).

Japanese Utility Model Publication No. 2-19463

However, when the work starts and the grindstone starts to contact the work piece for the first time, or when the grindstone starts moving away from the work piece and comes back into contact with the work piece to turn the work direction, A period in which only a part of the contact with the work piece occurs. Due to this fact, according to the normal technique as described above, the load between the grindstone and the work piece is measured to be small, and the relative moving speed between the grindstone and the work piece is appropriate. There was a problem of being driven at a value that is excessively higher than the value. In such a case, there is a problem that a part of the work piece is burnt or is excessively polished, and the required result cannot be provided.

The present invention has been developed by focusing on such problems of the prior art, and an object of the present invention is to provide a processing portion (for example, a grindstone, a cutter such as a milling tool, a cutting tool, or a drill) as a work piece. Control to process at a suitable speed that does not cause problems to the work piece at the time of starting contact (at the start of work and when changing the work direction, etc.) Specifically, between the work part and work piece It is to provide a machining apparatus that controls a relative movement speed between them, a rotation speed of the machining part itself, a control method thereof, and a program that executes the method.

The configuration of the present invention for achieving the above object is as follows. According to one embodiment of the present invention, a processing apparatus for processing a workpiece includes a processing unit having a cutter for processing the workpiece, a load detection unit for detecting a load applied to the cutter of the processing unit, and a processing apparatus. And a control unit for controlling various operations and functions. In the normal operation state where the normal cutting operation is smoothly performed while the entire width of the cutter is in contact with the workpiece , the control unit performs the work according to the magnitude of the load detected by the load detection unit. Increase or decrease the relative movement speed of the tool and the blade. In addition, when an overload is detected by the load detection unit, the relative movement speed between the work piece and the blade is lower than the relative movement speed between the work piece and the blade in the normal work state. To do. Then, by detecting the contact start time between the cutter of the processing unit and the work piece , and detecting a small load on the cutter for a predetermined period from the detected contact start point, In order not to increase the relative movement speed between the workpiece and the workpiece, the value is lower than the relative movement speed between the workpiece and the blade in the normal working state , and an overload is detected. In this case , control is performed so that the relative movement speed between the work and the blade is maintained at a value higher than the relative movement speed between the work and the blade .

According to another embodiment of the present invention, a processing unit having a cutting tool for processing a workpiece, a work table for placing the workpiece, a load detection unit for detecting a load applied to the cutting tool of the processing unit, A control method for a processing device including a control unit that controls various operations and functions of the processing device including driving of the processing unit and vertical movement and front / back and horizontal movement of the table . In a normal working state in which normal machining operations are performed smoothly while the entire width is in contact with the work piece, the relative between the work piece and the blade according to the magnitude of the load detected by the load detection unit. When the load detector detects an overload, the relative movement speed between the work piece and the blade is set to the relative speed between the work piece and the blade in the normal work state. The value is lower than the moving speed, and the cutting tool and workpiece By detecting the contact start time and detecting a small load on the blade for a predetermined period from the detected contact start time, the relative movement speed between the blade and the workpiece is increased. Therefore, the relative movement speed between the work and the blade when an overload is detected is lower than the relative movement speed between the work and the blade in the normal working state. Control is performed so that the relative moving speed between the workpiece and the blade is maintained at a higher value.

According to another embodiment of the present invention, a processing unit having a cutting tool for processing a workpiece, a work table for placing the workpiece, a load detection unit for detecting a load applied to the cutting tool of the processing unit, In a processing device including a control unit that controls various operations and functions of the processing device including driving of the processing unit and vertical movement and back and forth and horizontal movement of the table, a control program included in the control unit is: In a normal working state in which normal machining operations are smoothly performed while the entire width of the cutter is in contact with the workpiece, the workpiece and the cutter are in accordance with the magnitude of the load detected by the load detection unit. When the load detector detects an overload, the relative movement speed between the work piece and the blade in the normal work state is set. Set the value lower than the relative moving speed When the contact start time between the blade and the workpiece is detected, and the load applied to the blade is detected for a predetermined period from the detected contact start time, the load between the blade and the workpiece is detected. In order not to increase the relative moving speed, the value is lower than the relative moving speed between the work piece and the blade in the normal working state, and the work piece when overload is detected is Control is performed such that the relative movement speed between the work piece and the blade is maintained at a value higher than the relative movement speed with the blade.

According to still another embodiment of the present invention, a processing apparatus for processing a workpiece includes a processing unit having a cutter for processing the workpiece, a load detection unit for detecting a load applied to the cutter of the processing unit, and a processing And a control unit for controlling various operations and functions of the apparatus. In a normal working state in which normal machining operations are smoothly performed while the entire width of the blade is in contact with the work piece, the control unit uses the blade according to the magnitude of the load detected by the load detection unit. Increase or decrease the processing speed for the work piece. Further, when an overload is detected by the load detection unit, the processing speed for the work piece by the blade is set to a value lower than the processing speed for the work piece by the blade in a normal work state. Then, by detecting the contact start time between the cutting tool and the work piece in the processing portion, and detecting a small load on the blade for a predetermined period from the detected contact start time, the work piece by the tool is detected. The processing speed for the workpiece with the blade in a normal working state is lower than the processing speed for the workpiece with the blade when an overload is detected. Control is performed so that the machining speed of the workpiece by the blade is maintained at a high value.

According to the present invention, at the start of work or when the work direction is changed, the processing speed of the work piece, for example, between the work part and the work piece, for a predetermined period from the time when the work part and the work piece start to contact each other. Properly control the relative movement speed of the workpiece and the rotation speed of the processing part itself, and appropriately adjust the load such as the processing pressure on the work piece. Can do.

A deeper understanding of the present invention can be obtained when the following detailed description is considered in conjunction with the following drawings. These drawings are merely examples and do not limit the scope of the invention.
1 is a diagram conceptually illustrating a grinding apparatus according to an embodiment of the present invention. It is the figure which illustrated notionally the operation direction of the grinding device by one embodiment of the present invention. 3 is a flowchart illustrating a method for controlling a grinding apparatus according to an exemplary embodiment of the present invention. It is the figure which showed notionally the grinding apparatus by other embodiment of this invention. It is the figure which illustrated notionally the operation state of the grinding device by other embodiments of the present invention.

In the present specification, an embodiment in which the present invention is mainly applied to a grinding apparatus that processes a work by rotating a grindstone will be described, but the field of application of the present invention is not limited to a grinding apparatus. For example, the present invention can adjust the processing speed at the time when a processing unit including a cutting tool such as a grindstone, a milling cutter, a cutting tool, or a drill comes into contact with a work piece, and as a result, a machine tool that can adjust a load such as a processing pressure Note that it is also applicable to other machining techniques.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a view conceptually illustrating a grinding apparatus according to a first embodiment of the present invention. As shown in the figure, the grinding apparatus 10 according to the first embodiment of the present invention is a table on which a grindstone 20 that rotates and processes the workpiece 40 and a workpiece 40 that is processed by the grindstone 20 are placed. 30 and a control unit 100 that controls the operation of the grinding apparatus 10 including the operations of the grindstone 20 and the table 30. The grinding device 10 may further include an inverter 50 for measuring a load during rotation of the grindstone 20 and a vibration sensor 60 for detecting vibration of the table 30. The inverter 50 or the vibration sensor 60 may be attached afterwards. In addition, the grinding apparatus 10 may further include an input / output terminal 70 for transmitting and receiving signals and data to and from the control unit 100.

The grindstone 20 is rotated or stopped by a motor (not shown) driven by the control of the control unit 100. Further, the grindstone 20 moves up and down (in the Z-axis direction in the drawing) under the control of the control unit 100 to come into contact with or away from the work piece 40. When the grindstone 20 descends in the Z-axis direction while rotating and comes into contact with the work piece 40, the work work is performed on the work piece 40. As described above, such a machining operation can be started by lowering the grindstone 20 while the grindstone 20 rotates, but can also be started by raising the table 30.

The table 30 moves in the left-right direction (X-axis direction in the drawing) and the front-back direction (Y-axis direction in the drawing) under the control of the control unit 100. By such movement of the table in the X and Y axis directions and movement of the grindstone 20 in the Z axis direction, the work piece 40 is processed to have a predetermined shape.

With reference to FIG. 2, it demonstrates in detail about the above-mentioned working direction. FIG. 2 is a view conceptually illustrating the working direction of the grinding apparatus according to the first embodiment of the present invention. As shown in FIG. 2, the table 30 moves back and forth and right and left on a work plane (that is, an XY plane or a plane parallel thereto) on which a machining operation is performed. In FIG. 2, the work piece 40 is illustrated by a thick solid line. First, in the upper part of FIG. 2, the table 30 is moved while reciprocating left and right in the X-axis direction (thin solid arrow 200), and moving in the rear direction (minus direction of the Y-axis) in the Y-axis direction. The progressing state is illustrated. By such movement of the table 30, the work piece 40 is processed from the rear to the front (thick solid line arrow 204).

At this time, the grindstone 20 starts to come into contact with the work 40 in the vicinity of a square area 208 (shown as a “first contact start area”) indicated by a dotted line. Therefore, a load is applied to the grindstone 20. However, since only a part of the width of the grindstone 20 is in contact with the work piece 40 in the first contact start region 208, the inverter 50 is compared with the case where the entire width of the grindstone 20 is in contact with the work piece 40. In general, the output is measured so that the load amount is small. Thus, when it measures so that the load applied to the grindstone 20 is small, the control unit 100 determines that the machining operation is proceeding smoothly based on such information, and between the grindstone 20 and the work piece 40. There is a risk of controlling to increase the relative movement speed. If the relative movement speed between the grindstone 20 and the work piece 40 is increased in this way, the speed may not be suitable for the actual load. There is a possibility that problems may occur, such as excessive wear, or mechanical defects in the grindstone 20. Therefore, the control unit 100 according to one embodiment of the present invention detects whether the grindstone 20 is located in the first contact start area 208, and if so, the grindstone 20 and the work piece 40 are detected. Control is performed so that the relative movement speed between the two and the other is maintained at a predetermined value or decreased. According to one embodiment of the present invention, the relative moving speed between the grindstone 20 and the work piece 40 is preferably the moving speed of one or both of the table 30 in the X-axis direction and the Y-axis direction. .

Next, the lower part of FIG. 2 shows a state in which the table 30 changes its direction in the Y-axis direction and the work is advanced while moving in the forward direction (the positive direction of the Y-axis) (this specification). "The change of the working direction" means that the moving direction of the table 30 is changed in the direction of the Y axis in the state where the grinding stone 20 starts to rotate and the machining work on the work piece 40 has started.) . Of course, during this time as well, the table 30 reciprocates left and right in the direction of the X axis, and the work proceeds (solid arrow 202). The workpiece 40 is processed from the front to the back by the movement of the table 30 (thick solid arrow 206). When the work direction is changed in the Y-axis direction in this way, the area 210 indicated by the dotted line also becomes the contact start area (this is referred to as “second contact start area”). Even in the second contact start region, as described above, the load amount between the grindstone 20 and the work piece 40 is measured as a smaller value than during normal operation, and normal machining is in progress. And the relative movement speed between the grindstone 20 and the work piece 40 may be increased. Therefore, the control unit 100 of the present invention controls the relative movement speed between the grindstone 20 and the work piece 40 to be maintained or reduced even in the second contact start region.

Referring to FIG. 1 again, the configuration of the control unit 100 according to an embodiment of the present invention will be described in detail. As shown in the figure, the control unit 100 includes a central processing unit (CPU) 102 that performs various arithmetic processes and determination processes, a memory 104 that stores various types of information and data, and an input that accepts input from a user. Part 106 and display part 108 for displaying information to the user. The control unit 100 includes a table driving unit 110 that controls the movement of the grindstone 20 in the Z-axis direction and the movement of the table 30 on the XY plane, and a grindstone drive motor (not shown) that rotates the grindstone 20. ) Is further included. The control unit 100 further includes an input / output unit 114 that transmits and receives signals and data to and from the grinding apparatus body. The input / output unit 114 of the control unit 100 can transmit and receive signals and data to and from the inverter 50 and the drive sensor 60.

The grinding work control operation of the control unit 100 will be described in detail with reference to FIG. FIG. 3 is a flowchart showing a control method of a grinding apparatus according to an embodiment of the present invention. First, when the power is applied and the grinding work control operation of the control unit 100 is started (step S300), the control unit 100 operates the grindstone driving motor (step S302). At this time, the rotational speed of the grindstone drive motor and the relative moving speed between the grindstone 20 and the work piece 40 can be increased until the initial set value stored in the memory 104 is reached. .

Next, the control unit 100 determines whether the grindstone 20 and the work piece 40 have started to come into contact (step S304). According to one embodiment of the present invention, whether or not the contact between the grindstone 20 and the workpiece 40 can be started depends on the size information of the grindstone 20 and the workpiece 40 and the position information of the workpiece 40 on the table 30. , And the current position information of the table 30, etc., can be determined by calculation of the CPU 102. Alternatively, according to another embodiment of the present invention, whether to start contact between the grindstone 20 and the workpiece 40 can be determined by interpreting an output signal from the vibration sensor 60. That is, when the grindstone 20 and the work 40 start to contact, the vibration state of the table 30 changes, and the amplitude of the output signal from the vibration sensor 60 can increase or the frequency can change. The period during which the grindstone 20 is located in the first contact start region or the second contact start region is defined as a predetermined time from the moment when a change in the amplitude or frequency of the output signal from the vibration sensor 60 is detected. It can be processed to determine.

If the result of determination in step S304 is negative (ie, NO), control proceeds to step S310. Step S310 will be described later. When the result of the determination in step S304 is affirmative (that is, in the case of YES), the control unit 100 makes contact with the relative moving speed between the grindstone 20 and the work piece 40 set in advance. The speed value at the start is adjusted (step S306). According to one embodiment of the present invention, the speed value at the time of the contact start set in advance is such that the entire width of the grindstone 20 is exceeded when the grindstone 20 passes the first contact start region or the second contact start region. Lower than the relative moving speed between the grindstone 20 and the work piece 40 in a state in which normal machining work is smoothly executed while being in contact with the work piece 40 (this is referred to as “normal work state”). It is desirable to be a value. According to another embodiment of the present invention, the preset speed value at the start of contact starts to be excessively loaded between the grindstone 20 and the work piece 40 and the grindstone 20 and the work piece. 40 is a value higher than the relative moving speed between the grindstone 20 and the work piece 40 in a state where the relative moving speed between the grindstone 40 and the work piece 40 must be reduced (this is referred to as an “overload state”). It is desirable.

Next, the control unit 100 determines whether the machining operation has entered a normal operation state (step S308). According to one embodiment of the present invention, whether to enter the normal work state depends on the size information of the grindstone 20 and the work piece 40, the position information of the work piece 40 on the table 30, and the current position of the table 30. This can be determined by calculation of the CPU 102 using information or the like. Alternatively, according to another embodiment of the present invention, it is possible to interpret the change in the output signal from the vibration sensor 60 and determine whether or not it is possible to enter the normal working state.

If the result of determination at step S308 is negative (ie, NO), control returns to step S306 again. If the result of determination in step S308 is affirmative (i.e., YES), the normal control mode is entered (step S310). In the normal control mode, the amount of load applied to the grindstone 20 is measured based on the output of the inverter 50, and the relative relationship between the grindstone 20 and the work piece 40 is linearly or nonlinearly determined by the amount of the load. In this mode, control for increasing or decreasing the moving speed is performed. Most of the machining work is performed in this normal control mode.

Next, the control unit 100 determines whether or not the machining operation currently being executed has been completed (step S312). If it is determined that the work has not been completed (i.e., NO), the control returns to step S304. If it is determined that the work has been completed (ie, YES), the control is terminated (step S314).

According to the embodiment, in step 306, the controller 100 moves the relative movement between the grindstone 20 and the work piece 40 for a predetermined period from the start of contact between the grindstone 20 and the work piece 40. Although the speed is adjusted to a preset speed value at the start of contact, according to another embodiment of the present invention, the rotational speed itself of the grindstone 20 may be controlled. That is, it may be controlled as a value lower than the rotational speed of the grindstone 20 in a normal working state, and more desirably, this low value may be controlled as a value higher than the rotational speed of the grindstone 20 in an overload state. desirable. In addition, both the relative moving speed between the grindstone 20 and the work piece 40 and the rotational speed of the grindstone 20 are controlled for a predetermined period from the start of contact between the grindstone 20 and the work piece 40. The unit 100 may perform change control.

In the above embodiment, in step S304, the detection of the contact start of the grindstone 20 and the work piece 40 is detected by the CPU 102 (this is the position information of the grindstone 20 and the work piece 40, the position information of the table 30, and further Or based on the interpretation of the output signal of the vibration sensor 60. In addition to this, it is also possible to detect the start of contact between the grindstone 20 and the work piece 40 based on outputs from other types of sensors, such as acoustic sensors, optical sensors, and pressure sensors. Further, the start of contact between the grindstone 20 and the work piece 40 can be detected by detecting a force or moment applied to the driving motor of the grindstone 20 or the table 30 with a mechanical sensor such as a strain gauge.

The present invention can be applied not only to the surface grinding apparatus as in the above embodiment, but also to other types of grinding apparatuses such as a cylindrical grinding apparatus and an internal grinding apparatus.
FIG. 4 is a diagram conceptually illustrating another embodiment in which the present invention is applied to a cylindrical grinding apparatus. The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. In the cylindrical grinding apparatus 200 of FIG. 4, the cylindrical work piece 40 is supported between the headstock 201 and the tailstock 203 of the tailstock 202, and the outer peripheral surface is ground by the grindstone 20. At this time, the work piece 40 and the grindstone 20 are both rotated and processed. In this case, movement in the left-right direction (Z-axis direction) in the drawing includes a type in which the grindstone 20 itself moves, and a type in which the work piece 40 moves as the table 30 moves without moving the grindstone 20. . The movement of the grindstone 20 in the front-rear direction (X-axis direction) is performed by the grindstone head saddle 204. And the inverter 50 for measuring the load at the time of rotation of the grindstone 20 and the vibration sensor 60 for detecting the vibration of the table 30 are provided. In place of the vibration sensor 60, other types of sensors, for example, an acoustic sensor, an optical sensor, a pressure sensor, and the like are provided, and the contact start of the grindstone 20 and the workpiece 40 is detected based on the output. In addition, a force or moment applied to the driving motor of the grindstone 20 or the table 30 may be detected by a mechanical sensor such as a strain gauge to detect the start of contact between the grindstone 20 and the work piece 40. it can. The cylindrical grinding apparatus 200 can further include an input / output terminal 70 for transmitting and receiving signals and data to and from the control unit 100. The configuration and function of the control unit 100, particularly the control flow of the CPU 102, is the same as the control flow of FIG. 2 shown for the first embodiment.

In the grinding operation of the cylindrical grinding measure 200, as shown in FIG. 5, it is separated from the work piece 40 at the broken line, that is, when the work starts and the grindstone 20 starts to contact the work piece 40 for the first time or when it turns back. When recontacting (broken line portion in the figure), only a part of the grindstone 20 comes into contact with the work. In addition, although the rotation direction of the to-be-worked object 40 of FIG. At this time, assuming that the output of the inverter 50 that measures the load during rotation of the grindstone 20 is small, if the movement speed in the Z direction is excessively increased, there is a problem that a part of the work 40 is burnt. This results in excessive grinding. In particular, when the width of the grindstone 20 is large, the influence is remarkable. Therefore, the grinding wheel 20 is in contact with the work piece 40, and the grinding period for a predetermined period (period of relative movement in the Z direction of the broken line portion in FIG. 5) is forcibly set between the grindstone 20 and the work piece 40. The relative movement speed in the Z direction will be lower than the normal work speed (control flow step S306 in FIG. 3 of the CPU 102). Alternatively, at least one of the relative moving speed between the grindstone 20 and the work piece 40 and the rotation speed of the grindstone 20 is set for a predetermined period from the start of contact between the grindstone 20 and the work piece 40. This is because the speed value at the start of contact that has been set in advance is controlled as a value lower than that in the normal working state, and more preferably as a value that is higher than that in the overload state.

The present invention can also be applied to processing devices such as other types of machine tools. In this case, for example, in the case of milling, at least one of the rotational speed of the cutting tool (milling) used as the processing part or the relative movement speed of the cutting tool and the work piece is determined at the time when the contact between the cutting tool and the work piece starts. This is because the speed value at the start of contact set in advance for a predetermined period is set to a value lower than the normal working state, and preferably higher than the overload state. As another example, when performing turning, the rotational speed of the work piece or the relative movement speed with the cutting tool (tool) used as a machining part is determined from the contact start point of the grindstone and the work piece. During this period, the speed value at the start of contact set in advance is set to a value lower than that in the normal working state, and preferably higher than that in the overload state. As another example, when drilling is performed, the rotational speed of the cutting tool (drill) used as the processing unit or the relative movement speed with respect to the work piece is determined from the contact start point between the cutting tool and the work piece. It is a speed value at the start of contact that is set in advance for a predetermined period, and is set to a value lower than that in the normal working state, and preferably higher than that in the overload state. The present invention can be similarly applied to processing devices such as other types of machine tools.

Those skilled in the art to which the present invention pertains can derive many variations and other embodiments of the present invention from the above description and related drawings. Accordingly, the present invention is not limited to the specific embodiments disclosed. In this specification, a number of specific terms are used, but these are used in a general sense for illustrative purposes only and not for purposes of limiting the invention. Various modifications can be made without departing from the concept and idea of the general invention defined by the appended claims and their equivalents.

Although several embodiments of the present invention have been described, the scope of the present invention is not limited to the above-described embodiments, and includes the scope of the invention described in the claims and equivalents thereof. .

10 Grinding equipment
20 Grinding wheel 30 Table 40 Workpiece 100 Control unit 102 CPU
104 Memory 106 Input Unit 108 Display Unit 110 Table Drive Unit 112 Grinding Wheel Rotation Drive Unit 200 Cylindrical Grinding Device 201 Spindle 202 Tailstock 203 Tailstock

Claims (16)

A processing device for processing a workpiece,
A processing unit having a cutting tool for processing a workpiece;
A load detection unit for detecting a load applied to the cutting tool of the processing unit;
Including a control unit for controlling various operations and functions of the processing apparatus,
The control unit
In a normal working state in which normal machining operations are smoothly performed while the entire width of the cutter is in contact with the workpiece, the workpiece and the cutter are in accordance with the magnitude of the load detected by the load detection unit. Increase or decrease the relative movement speed of
When overload is detected by the load detector, the relative movement speed between the work piece and the blade is set to a value lower than the relative movement speed between the work piece and the blade in the normal work state.
By detecting the contact start time between the cutting tool and the work piece in the processing section , and detecting a small load on the blade for a predetermined period from the detected contact start time , The work speed when the overload is detected is lower than the relative movement speed between the work piece and the blade in the normal work state so as not to increase the relative movement speed. A processing apparatus that controls the relative movement speed of the workpiece and the blade to be maintained at a value higher than the relative movement speed of the blade and the blade . The processing apparatus further includes a work table on which the work piece is placed,
The control unit
A central processing unit (CPU) that performs various arithmetic processes and judgment processes;
A memory for storing various information and data,
An input unit that receives input from the user;
A display for displaying information to the user;
A movement drive unit that controls the vertical movement of the processing unit and the movement of the table on the work plane in the front-rear and left-right directions;
2. The processing apparatus according to claim 1, further comprising a processing unit driving unit that drives the processing unit. The processing apparatus according to claim 1 or 2, wherein the cutting tool of the processing unit includes a grindstone. The processing apparatus according to claim 1 or 2 , wherein the cutting tool of the processing unit includes a milling cutter, a cutting tool , and a drill. The processing device according to claim 2, wherein the control unit detects a contact start time by calculation of the central processing unit based on positional information of the processing unit and the work piece and changes thereof. The processing apparatus according to claim 1, wherein the control unit includes a sensor that detects the start of contact between the processing unit and the workpiece. A processing unit having a cutting tool for processing a work piece, a work table on which the work piece is placed, a load detection unit for detecting a load applied to the cutting tool of the processing part, and driving of the processing part and vertical movement A control method for a processing apparatus including a control unit that controls various operations and functions of the processing apparatus including front and rear and left and right movements of the table,
The control unit
In a normal working state in which normal machining operations are smoothly performed while the entire width of the cutter is in contact with the workpiece, the workpiece and the cutter are in accordance with the magnitude of the load detected by the load detection unit. Increase or decrease the relative movement speed of
When overload is detected by the load detector, the relative movement speed between the work piece and the blade is set to a value lower than the relative movement speed between the work piece and the blade in the normal work state.
By detecting the contact start time between the cutting tool and the work piece in the processing section, and detecting a small load on the blade for a predetermined period from the detected contact start time, The work speed when the overload is detected is lower than the relative movement speed between the work piece and the blade in the normal work state so as not to increase the relative movement speed. A control method for a machining apparatus, wherein control is performed such that a relative movement speed between a workpiece and a cutter is maintained at a value higher than a relative movement speed between the workpiece and the cutter . A processing unit having a cutting tool for processing a work piece, a work table on which the work piece is placed, a load detection unit for detecting a load applied to the cutting tool of the processing part, and driving of the processing part and vertical movement In a processing apparatus including a control unit that controls various operations and functions of the processing apparatus including movement of the table in the front-rear and left-right directions,
The control program included in the control unit is
In a normal working state in which normal machining operations are smoothly performed while the entire width of the cutter is in contact with the workpiece, the workpiece and the cutter are in accordance with the magnitude of the load detected by the load detection unit. Increase or decrease the relative movement speed of
When overload is detected by the load detector, the relative movement speed between the work piece and the blade is set to a value lower than the relative movement speed between the work piece and the blade in the normal work state.
By detecting the contact start time between the cutting tool and the work piece in the processing section, and detecting a small load on the blade for a predetermined period from the detected contact start time, The work speed when the overload is detected is lower than the relative movement speed between the work piece and the blade in the normal work state so as not to increase the relative movement speed. A control program for a machining apparatus that performs processing for controlling the relative movement speed between the workpiece and the blade to be maintained at a value higher than the relative movement speed between the blade and the blade . A processing device for processing a workpiece,
A processing unit having a cutting tool for processing a workpiece;
A load detection unit for detecting a load applied to the cutting tool of the processing unit;
Including a control unit for controlling various operations and functions of the processing apparatus,
The control unit
In a normal working state in which normal machining operations are smoothly performed while the entire width of the cutter is in contact with the workpiece, the workpiece is detected by the cutter according to the magnitude of the load detected by the load detection unit. While increasing or decreasing the processing speed,
If overload is detected by the load detector, the processing speed for the work piece by the blade is set to a value lower than the processing speed for the work piece by the blade in the normal working state,
By detecting the contact start time between the cutting tool and the work piece in the processing section, and detecting a small load on the blade for a predetermined period from the detected contact start time, machining the work piece by the tool In order not to increase the speed, the value is lower than the processing speed for the work piece by the blade in a normal working state and higher than the processing speed for the work piece by the blade when an overload is detected. The processing apparatus is controlled so that the processing speed of the workpiece by the blade is maintained.
The processing apparatus further includes a fixing portion for fixing the work piece,
The control unit
A central processing unit (CPU) that performs various arithmetic processes and judgment processes;
A memory for storing various information and data,
An input unit that receives input from the user;
A display for displaying information to the user;
A drive unit for driving at least the processing unit;
The processing apparatus according to claim 9, comprising: The control unit controls the processing speed of the workpiece by the processing unit by changing a relative moving speed between the blade of the processing unit and the workpiece. Or the processing apparatus of 10. 11. The processing apparatus according to claim 9, wherein the control unit controls the processing speed of the workpiece by the processing unit by changing the rotation speed of the blade itself of the processing unit. 11. The processing apparatus according to claim 9, wherein the cutting tool of the processing unit includes a grindstone. The processing apparatus according to claim 9 or 10 , wherein the cutting tool of the processing unit includes a milling cutter, a cutting tool , and a drill. The processing device according to claim 10, wherein the control unit detects a contact start time by calculation of a central processing unit based on positional information of the processing unit and the work piece and changes thereof. 11. The processing apparatus according to claim 9, wherein the control unit includes a sensor that detects the start of contact between the processing unit and the workpiece.