JP3231661B2 - Processing control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machining control device for setting machining control data for a machine tool such as a grinder.

[0002]

2. Description of the Related Art When processing a workpiece by controlling a machine tool using an NC control device or the like, it is necessary to set a plurality of processing conditions for determining a processing state in advance. For example, when processing a non-cylindrical body such as a cam, which is an engine part, using a grinder that performs grinding by moving a grinding wheel on a rotating non-working object, the spindle rotation speed is set as a processing condition. , Grinding wheel diameter, grinding wheel rotation speed, grinding wheel wear,
It is necessary to set a large number of data such as a grinding depth, a rough grinding amount, a medium finish grinding amount, and a finish grinding amount. In particular, the number of revolutions of the spindle supporting the cam, which is the workpiece, has a great effect on the machining result, and as a method of setting the number of revolutions of the spindle to obtain a good machining result, the circumference of the cam with which the grinding wheel contacts is used. There are known processing theories such as equal peripheral speed processing for making the surface speed constant, equal cutting amount processing for making the cutting amount constant, and equal load processing for making the addition acting on the grinding wheel constant.

For example, when the spindle speed is set by equal peripheral speed machining, the moving speed of the contact point between the peripheral surface of the cam and the peripheral surface of the grinding wheel is always constant based on the input profile data. Then, the speed change state of the main shaft rotation speed accompanying the rotation of the cam is determined. The profile data is data determined from the outer shape of the cam to be obtained and the outer shape of the grinding wheel used for grinding, and the locus of the contact point between the peripheral surface of the cam and the peripheral surface of the grinding wheel due to the rotation of the cam. This is data that reciprocates orthogonally to the cam surface on which the grinding wheel rotates based on the data that is represented.

[0004]

However, the processing theory used for setting the processing conditions is that the cutting condition of the workpiece by the grinding wheel is always constant, and the moving body in the movement of the grinding wheel or the like is used. This is the first time that the followability is ideal, and the actual machining conditions set by the operator generally match the speed change point of the moving body, but the theory actually obtained by the machining theory Even if the values are used as they are, good processing results cannot be obtained.

[0005] For this reason, processing conditions such as the spindle speed are often determined based on the experience of the operator, and it is extremely difficult for a beginner to determine the processing conditions. In addition, even for skilled workers, trial and error are often repeated until the processing conditions are determined, which requires a long time in the preparation stage before starting the processing operation, resulting in a significant decrease in work efficiency. There was a problem to do.

Japanese Patent Application Laid-Open No. 1-316152 discloses a display means for displaying a set and inputted processing condition and a processing state under the processing condition in a time-series manner.
There is disclosed a configuration in which a change input of a set value of a processing condition is received so that a processing state becomes appropriate. However, even with this configuration, there is no index serving as an initial setting of a processing condition, and an optimum Until a proper processing condition is determined, trial and error of an experienced expert is required, and it is not possible to improve work efficiency.

The present invention has been made in view of the fact that a working condition based on a known working theory is operated based on a working condition set by an operator.
The processing conditions obtained from the known processing theory are displayed on the display screen as the reference processing conditions, and the input of the processing conditions is received in a form in which the reference processing conditions are visually corrected on the display screen. It is an object of the present invention to provide a machining control device that enables even a beginner to easily set machining conditions while referring to the index as an index, and shortens preparations before starting a machining operation, thereby improving work efficiency.

[0008]

According to a first aspect of the present invention, there is provided a machining control apparatus for receiving a setting input of a machining condition for operating a machine tool and controlling the machine tool based on the set machining condition. Input means for accepting the input operation of the correction data of the processing condition in the control diagram representing the control state of the set processing condition on the control diagram displayed on the display screen of the display means; A control diagram is corrected based on the correction data, an operation diagram is created based on the control diagram, and displayed on a display screen of a display unit, and a machine tool is created based on a processing condition represented by the operation diagram. And control means for controlling

According to the first aspect of the present invention, the input means receives the input of the correction data on the control diagram displayed on the display screen of the display means. The control means creates an operation diagram representing machining conditions for controlling the machine tool by replacing the data of the control diagram with the input correction data. Therefore, the operator can easily correct any data in the displayed control diagram on the display screen, and easily set the processing conditions for controlling the machine tool using the control diagram as an index. it can.

According to a second aspect of the present invention, the control means corrects the control diagram by interpolation using the correction data input by the input means, and creates an operation diagram based on the control diagram. It is characterized by doing.

According to the invention described in claim 2, the control means creates a new control diagram by performing an interpolation operation on the control diagram after the replacement with the correction data, and creates a new control diagram based on the control diagram. An operation diagram showing a change state of a processing condition for controlling a machine is created. Therefore, the operation diagram is created in a state where the correction data and the data other than the correction data in the control diagram are smoothly connected.

[0012] The invention described in claim 3 is characterized in that the control means displays an operation diagram and a control diagram at the same time.

According to the third aspect of the present invention, the operation diagram and the control diagram are displayed simultaneously, and the difference between the control diagram and the operation diagram can be easily confirmed.

The invention described in claim 4 is characterized in that the control means displays the operation diagram in a display mode different from that of the control diagram.

According to the fourth aspect of the present invention, the operation diagram and the control diagram are clearly distinguished on the display screen.

According to a fifth aspect of the present invention, the control means displays the control state of the second processing condition by using a theoretical formula preset based on the first processing condition input previously. The method is characterized in that a diagram is created and displayed on a display screen of a display unit, and an operation diagram is created from the second processing condition based on the correction data input through the input unit.

In the invention described in claim 5, the first aspect
The second processing condition is set in such a manner that the theoretical control diagram is corrected to an actual control diagram desired by the operator, using the theoretical control diagram created based on the processing condition as an index. .

According to a sixth aspect of the present invention, the control means includes a new control diagram representing a control state of a second processing condition based on the input first processing condition, and an operation of the machine tool. A diagram representing the state is created and displayed on the display screen of the display means, and an operation diagram representing the operation state of the machine tool controlled by the second machining condition represented by the control diagram is created and displayed. It is characterized in that it is displayed on the display screen of the means.

According to the sixth aspect of the present invention, the first
A second control diagram of the machine tool in a state where the first machining condition is set and an operation diagram of the machine tool in a state where the second machining condition is set are displayed. Therefore, by referring to the operation diagram of the machine tool, the moving body of the machine tool is ideally determined from the second processing condition represented by the operation diagram created by the correction position and the correction value of the input processing condition. It can be easily confirmed whether or not the vehicle can follow.

According to a seventh aspect of the present invention, the first processing condition is profile data based on outer shape data of a workpiece having a non-cylindrical shape, and the second processing condition is a workpiece in a grinding machine. The number of revolutions of the main shaft that supports

In the invention described in claim 7, the control data of the number of revolutions of the spindle to be supplied to the grinding machine when grinding the non-cylindrical workpiece can be easily obtained by using the theoretical control diagram as an index. Is set to

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a machining control device according to the present invention is applied to a cam grinder will be described below. FIG. 1 is a diagram showing a configuration of a grinding machine to which a processing control device according to an embodiment of the present invention is applied. Grinding machine 1 shown in FIG.
0, the spindle servomotor 11
The spindle servomotor 11 is fixed to the upper headstock 13 and rotationally drives a spindle 15 on which a workpiece 14 is mounted. The tail stock 26 is provided to face the main shaft 15 and rotatably holds the rotation axis of the workpiece 14. The rotational speed of the spindle servomotor 11 is feedback-controlled by a closed loop formed by the pulse generator 16, the control unit 17 and the spindle servomotor 11. The pulse generator 16 includes the spindle servomotor 1
A position detection pulse is output based on one rotation. This position detection pulse is input to the control unit 17.

The grinding wheel 18 is moved by the motor 19 to the belt 2.
The grindstone table 20, which is rotationally driven through 7 and has a grindstone wheel 18 attached thereto, is transmitted through a feed screw 24 to a grinding wheel feed servomotor (hereinafter simply referred to as a servomotor) 2.
1 reciprocates along a guide 25 arranged in the X-axis direction orthogonal to the rotation axis of the main shaft 15. That is, the grinding machine 10 reciprocates the grinding wheel 18 in the X-axis direction together with the grinding wheel head 20 in synchronization with the rotation of the workpiece 14 mounted on the headstock 13, thereby grinding the workpiece 14. Process into a non-cylindrical body. The servo motor 21 is feedback-controlled by a closed loop formed by the pulse generator 22, the control unit 23 and the servo motor 21. The pulse generator 22 includes the servo motor 2
A position detection pulse is output based on one rotation. This position detection pulse is input to the control unit 23.

FIG. 2 is a block diagram showing the configuration of the machining control device according to the embodiment of the present invention. Processing control device 1
Indicates that the CPU 2 having the ROM 3 and the RAM 4
An input / output device such as an AM 5, a display controller 6 including a display 6a, a touch panel controller 7 including a touch panel 7a, and a data interface 8 is connected. The ROM 3 has a touch panel 7
a process of receiving an input of a set value of a processing condition via a
Programs such as a process for calculating another processing condition based on the input processing condition value and a process for creating display data representing the display content of the display 6a are written in advance.

The CPU 2 corresponds to the control means of the present invention, and controls each input / output device according to a program written in the ROM 3. At this time, CPU
2 is stored in a predetermined memory area of the RAM 4. The display controller 6 has a CP
The display data created by U2 is read from the V-RAM 5 and supplied to the display 6a. The touch panel controller 7 corresponds to the input means of the present invention, and inputs operation data to the CPU 2 on the transparent touch panel 7a which is arranged in close contact with the screen of the display 6a. The data interface 8 transmits and receives data to and from the control units 17 and 23 provided on the grinding machine 10.

Hereinafter, in the case where the cam grinding operation in the cutting machine 10 is controlled using the machining control device 1,
A process for receiving a setting input of the spindle rotation speed as a processing condition will be described. FIG. 3 is a flowchart showing a main part of a processing procedure in the processing control device. CP
U2 is, for example, as shown in FIG.
A selection screen of profile data for specifying the shape of a cam as a workpiece is displayed (s1), and the operator waits for the selection input of profile data (s2). When the operator selects one of the profile data by operating the touch panel 7a, the CPU 2 determines whether the cam having the shape of the selected profile data is to be ground by, for example, constant peripheral speed machining while the spindle 13a rotates once. Then, a theoretical main shaft shift curve representing the change in the rotation speed of the main shaft 13a is created (s3). This theoretical main shaft shift curve is an example of a control diagram of the present invention.

That is, the non-cylindrical cam 14 having an irregular distance from the center of rotation to the peripheral surface is rotated while being supported by the main shaft 13a, and the peripheral surface of the grinding wheel 18 is brought into contact with the peripheral surface of the cam 14. When grinding to a shape specified by the profile data, if the rotation speed of the main shaft 13a is constant, a portion of the peripheral surface of the cam 14 that is a long distance from the rotation center at a position in contact with the peripheral surface of the grinding wheel 18 The peripheral speed is higher than the peripheral speed at a position where the distance from the rotation center is short to the peripheral surface of the grinding wheel 18.

Since the portion of the peripheral surface of the cam 14 that contacts the peripheral surface of the grinding wheel 18 changes according to the rotation of the main shaft 13a, the peripheral speed at the position that contacts the peripheral surface of the grinding wheel 18 To equalize over the circumference, the spindle 1
It is necessary to change the rotation speed of 3a according to the rotation angle of cam 14 during one rotation of main shaft 13a. Here, the changing state of the peripheral speed of the cam 14 depends on the data representing the trajectory of the contact point between the peripheral surface of the cam 14 and the peripheral surface of the grinding wheel. Depends on data. Therefore, the CPU 2 creates a theoretical main shaft shift curve according to the profile data selected and input. As will be described later, the theoretical spindle speed change curve is an index when the operator sets the spindle speed as one of the processing conditions by the processing shown in FIG.

Next, under the condition that the main shaft 13a is rotated at a constant speed, the CPU 2 searches for the profile data based on the cam shape data selected and inputted.
A wheel head acceleration curve representing the moving state of the wheel head 20 supporting the wheel head 8 is created (s4). This wheel head acceleration curve is an example of the operation diagram of the present invention, and matches the profile data selected and input by the operator during one revolution of the main shaft 13a in a state where the main shaft 13a rotates at a constant cam shape. In this manner, the state in which the acceleration to be applied to the wheel head 20 is changed when the wheel head 20 is moved in the X-axis direction.

The acceleration that can be given to the grinding wheel head 20 is limited by the output of the servomotor 21 and the mass of the grinding wheel head 20, and the like, and the acceleration to be given to the grinding wheel head 20 changes according to the number of spindle rotations at the rotation angle of the spindle. . Further, it is known that a favorable grinding result can be obtained in a state where the acceleration change of the grinding wheel head 20 during one rotation of the spindle 13a is smooth. Therefore, when setting the spindle speed, the acceleration change of the wheel head 20 is checked by confirming the peak position of the acceleration change of the wheel head 20 when the spindle speed is constant with reference to the reference wheel head acceleration curve. In order to smooth and obtain a good grinding result, it is possible to recognize a portion where the rotation speed of the main shaft 13a should be changed during one rotation of the main shaft 13a.

Thereafter, the CPU 2 displays the created theoretical spindle speed change curve and the wheel head acceleration curve on the display 6a (s5). FIG. 5 shows an example of this display state. In the example shown in FIG. 5, a graph in which the horizontal axis represents the rotation angle of the main shaft 13a and the vertical axis represents the rotation speed is displayed on the display screen of the display 6a, and the theoretical main shaft shift curve C1 is displayed on this graph. Also, wheel head acceleration curve C2
In this graph, the horizontal axis is the rotation angle of the main shaft 13a and the vertical axis is the acceleration, which is displayed simultaneously with the theoretical main shaft shift curve C1. In addition, by changing the display mode such as the display color in the theoretical spindle speed change curve C1 and the wheel head acceleration curve C2, the visibility of the display content for the operator can be improved. In addition, as shown in FIG. 5, the time required for one rotation of the spindle 13a is displayed at the top of the screen.

The CPU 2 accepts a correction input of the spindle rotation speed by the operator on the touch panel 7a with the theoretical spindle shift curve C1 and the grinding wheel acceleration curve C2 displayed on the display 6a (s6). As aforementioned,
The touch panel 7a is arranged in close contact with the display screen of the display 6a, and the operator sets the horizontal axis according to the rotation angle of the spindle 13a for which correction of the spindle rotation speed is desired in the theoretical spindle shift curve C1 displayed on the display 6a. The upper operation position is determined, and the operation position on the vertical axis is determined based on the corrected spindle rotational speed, and the touch panel 7a on the theoretical main shaft shift curve C1 is pressed. At this time,
As described above, the operator sets the reference wheel head acceleration curve C
2 with reference to the peak position in FIG.
It is possible to determine a rotation position at which the spindle speed of one should be corrected. By a single pressing operation of the touch panel 7a, a portion to be corrected in the theoretical main shaft shift curve C1 and the corrected main shaft rotation speed are simultaneously input. Therefore, the operator refers to the theoretical main shaft shift curve C1 displayed on the display 6a as an index and partially corrects the theoretical main shaft shift curve C1 as a machining condition to be set in the grinding machine 10. Spindle speed data can be created. The CPU 2 controls the spindle 1 corresponding to the operation position of the touch panel 7 a detected by the touch panel controller 7.
The rotation angle range and the spindle rotation speed of 3a are stored as correction data (s7).

As shown in FIG. 6, when the operator presses the touch panel 7a, the rotation angle range of the spindle 13a and the numerical value of the spindle rotation speed corresponding to the operation position of the touch panel 7a detected by the touch panel controller 7 Display 6
A superimpose function of displaying b on a part of the screen of the display 6a together with the numeric keypad 6c may be provided, and editing of the rotation angle range of the spindle 13a and the set value of the spindle rotation speed by operating the numeric keypad 6c may be accepted. . For example, FIG. 6 shows a case where the operator presses the data correction position 7b on the touch panel 7a.

The s related to the correction input of the theoretical main shaft shift curve C1 by the above-mentioned pressing operation of the touch panel 7a by the operator.
6 and s7 are repeated once or plural times, and when the correction input by the operator is completed, the CPU 2
Executes an interpolation operation based on single or plural correction data on the theoretical main shaft shift curve C1 to create an actual main shaft shift curve C3 (s8, s9). This interpolation calculation is performed using, for example, a spline function, and the actual spindle speed curve C1 is deformed so that the corrected spindle speed data smoothly continues to the uncorrected spindle speed data. A shift curve C3 is newly created.

Further, the CPU 2 calculates the spindle speed represented by the newly created actual spindle speed change curve C3 as the spindle 1 speed.
An actual wheel head acceleration curve C4 representing the acceleration change of the wheel head 20 when given to 3a is created (s10). (S11). FIG. 7 shows an example of the display state at this time. The actual wheel head acceleration curve C4 is a change in acceleration to be given to the wheel head 20 moving in the X-axis direction when the main shaft 13a is driven by the actual main shaft shift curve C3 created by the correction data set and input by the operator. It shows a state. Therefore, the operator can determine whether the correction data set and input is appropriate based on whether or not the actual grinding wheel acceleration curve C4 displayed on the display 6a is smooth. At this time, by displaying each of the actual main shaft shift curve C3, the actual wheel head acceleration curve C4, and the theoretical main shaft shift curve C1 in individual display modes, the visibility of the display contents by the operator can be improved.

Thereafter, the CPU 2 displays a confirmation key (not shown) on the display 6a by, for example, the superimpose function. If the operator operates the confirmation key after determining that the correction data set and input by the operator is appropriate, the CP
U2 outputs the spindle speed data represented by the actual spindle shift curve C3 to the control unit 17 of the grinding machine 10 as one of the processing conditions (s12, s13).

By the above processing, the theoretical spindle speed change curve C1 created based on the profile data as the first processing condition set by the operator is displayed on the display 6a, and the touch panel arranged on the screen of the display 6a The input of the correction data of the theoretical spindle shift curve C1 is received by the pressing operation of 7a, and the actual spindle shift curve C3 to be supplied to the control unit 17 of the grinding machine 10 by correcting the theoretical spindle shift curve C1 with the input correction data. Create Therefore, the operator refers to the theoretical main shaft shift curve C1 displayed on the display 6a and the time required for one rotation of the main shaft 13a described above as an index, and displays the theoretical main shaft shift curve C1 on the screen of the display 6a. In the embodiment, the spindle speed, which is the second machining condition represented by the actual spindle speed change curve C3, can be set very easily.

[0038]

According to the first aspect of the present invention, the operator can easily correct the data in the displayed control diagram on the display screen, and can perform processing to be supplied to the machine tool. Conditions can be easily set on the display screen using the control diagram as an index.

According to the second aspect of the present invention, the operation diagram is created in a state where the correction data and the data other than the correction data in the control diagram are smoothly connected, so that the machine tool operates smoothly. The processing conditions can be set in a state where the processing is performed.

According to the third aspect of the present invention, by simultaneously displaying the operation diagram and the control diagram, the operator can easily confirm the difference between the control diagram and the operation diagram. The processing conditions can be set within a range that does not greatly deviate from the control diagram.

According to the fourth aspect of the present invention, the operation diagram and the control diagram can be clearly distinguished on the display screen, and the visibility of the display contents for the operator can be improved.

According to the fifth aspect of the present invention, the actual control desired by the operator is set based on the theoretical control diagram created based on the first machining condition as an index. The second processing condition can be set in such a manner as to be corrected to the diagram, and the second processing condition can be set very easily in a state where the second processing condition is adapted to the first processing condition.

According to the sixth aspect of the present invention, by referring to the operation diagram of the machine tool, the second machining condition represented by the operation diagram created by the correction position and the correction value set and inputted. Can be easily determined whether the moving body of the machine tool can ideally follow.

According to the present invention, the control data of the number of revolutions of the spindle to be supplied to the grinding machine at the time of grinding the workpiece having a non-cylindrical shape is theoretically displayed on the display screen. It can be set very easily on the display screen using the control diagram as an index.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a grinding machine to which a processing control device according to an embodiment of the present invention is applied.

FIG. 2 is a block diagram showing a configuration of the processing control device.

FIG. 3 is a flowchart showing a main part of a processing procedure of the processing control device.

FIG. 4

FIG. 7 is a diagram showing an example of a display screen on a display of the processing control device.

[Explanation of symbols]

 1-processing control device 2-CPU (control means) 6a-display 7a-touch panel (input means) 10-grinding machine 11-servo motor 13-headstock 13a-spindle 14-cam (workpiece) 17-control unit

────────────────────────────────────────────────── ─── Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G05B 19/18-19/46 B23Q 15/00-15/28 B24B 41/00-51/00 G06F 3 / 033-3/037

Claims (7)

(57) [Claims] 1. A machining control device for receiving a setting input of a machining condition for operating a machine tool and controlling the machine tool based on the set machining condition, wherein a control line representing a control state of the set machining condition. Input means for accepting the input operation of the correction data of the processing condition in the drawing on a control diagram displayed on a display screen of a display means, and correcting the control diagram based on the correction data input by the input means and controlling the same. Control means for creating an operation diagram based on the diagram and displaying it on the display screen of the display means, and controlling the machine tool based on the processing conditions represented by the operation diagram, Processing control device. 2. The processing according to claim 1, wherein said control means corrects the control diagram by an interpolation operation based on the correction data inputted by said input means, and creates an operation diagram based on the control diagram. Control device. 3. The processing control device according to claim 1, wherein said control means displays an operation diagram and a control diagram at the same time. 4. The processing control device according to claim 3, wherein said control means displays the operation diagram in a display mode different from that of the control diagram. 5. The control means creates and displays a control diagram representing a control state of a second machining condition using a theoretical formula set in advance based on the first machining condition input previously. The processing control device according to any one of claims 1 to 4, wherein an operation diagram is created from a second processing condition based on the correction data input through the input means while being displayed on a display screen of the means. . 6. The control means creates a new control diagram representing a control state of a second machining condition based on the input first machining condition and a diagram representing an operation state of a machine tool. To display on the display screen of the display means, and to create on the display screen of the display means an operation diagram representing the operation state of the machine tool controlled by the second machining condition represented by the control diagram The processing control device according to claim 1. 7. The method according to claim 1, wherein the first processing condition is profile data based on outer shape data of the workpiece having a non-cylindrical shape, and the second processing condition is a rotation speed of a spindle supporting the workpiece in a grinding machine. The processing control device according to claim 5, wherein: