JP3205827B2 - Processing data creation device for non-circular workpieces - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preparing machining data of a non-circular workpiece, which makes it easy to visually understand an editing operation, can perform the operation without skilled knowledge, and eliminates numerical input and prevents input errors. .

[0002]

2. Description of the Related Art In a device such as a grinding machine for processing a non-circular workpiece such as a cam by synchronous control of the rotation of a spindle and a feed motion of a wheel head provided with a grinding wheel, the rotation angle of the spindle, the grinding wheel head, The control data of the moving position of is required. (Hereafter referred to as X / C axis data.)

[0003] X / C axis data is usually obtained from the shape data (lift data) obtained from the distance from the center of rotation of the workpiece to the outer surface and the angle of a line segment representing the distance for one round of the workpiece. In consideration of the diameter of the grinding wheel and the time required for the workpiece to make one revolution, X / C axis data representing the rotation angle of the spindle and the moving position of the grinding wheel head is created, and machining is performed based on this data. Will be Generally, the shape error increases when the acceleration of the grinding wheel head increases, so that the data is created so that the acceleration of the grinding wheel head decreases. Also,
In a portion where the grinding speed (hereinafter, referred to as a peripheral speed) on the outer periphery of the workpiece suddenly increases, the grinding resistance is increased and the workpiece is bent, causing a shape error. In such a case,
The data is created so that the X / C axis moves at a low speed in order to reduce the amount of grinding per unit time.

[0004] This will be explained by taking the cam grinding as an example. In the grinding of the lift portion of the cam, since the acceleration of the grinding wheel head increases, the deflection of the grinding wheel head system occurs, and the servo tracking error increases. Processing errors increase due to the cause. Therefore, the X / C axis data must be created so that the wheel head moves slowly. In addition, since the peripheral speed in the lift portion is suddenly increased, the amount of grinding per unit time is sharply increased, the workpiece is bent, and uncut portions are generated, resulting in a shape error. Also in this case, the X / C axis data must be created so that the moving speed of the wheel head is reduced and the amount of grinding per unit time is reduced. Thus, the speed of the X / C axis data had to be reduced by two factors.

In order to solve this problem, the applicant of the present application has previously disclosed in
-301154 is proposed. According to this technique, X / C axis data is prepared in advance so that the outer periphery of the cam can be ground at a constant and sufficiently low grinding speed, and then the X / C axis data is read every predetermined number of steps. Skip to create new X / C axis data. At this time, changes in speed, acceleration, and acceleration are calculated, and it is checked whether the calculated values are within the respective limit values. If it does not fall within the limit value, the number of skipped steps is reduced and corrected X / C axis data is created again. In this manner, X / C axis data used for grinding is generated. These limit values have been input numerically by the operator from the keyboard of the processing data creation device for non-circular workpieces.

[0006]

However, in such a non-circular workpiece machining data creating apparatus for inputting numerical values of such limit values, firstly, it is difficult to detect mistakes when inputting numerical values. This means that a person who is proficient in the work of creating machining data can judge the validity of the numerical value, but a person without skill can understand phenomena such as acceleration from the numerical value alone. Hard to do.

When there is an input error in the control value,
Increasing processing errors, hardening hardness of cam decreases,
Damages CBN abrasive grains and shortens the life of expensive CBN wheels. If the control value exceeds the following limit of the processing machine, not only an excessive load is applied to the machine, but also simultaneous control of the spindle and the grindstone cannot be performed. Secondly, even for non-circular workpieces such as cams, it may be sufficient if a high shape accuracy can be obtained partially, and a portion with a low shape accuracy may have a large limit value. In some cases, the limit value of the acceleration of the part is effective, so that the moving speed of the grindstone head becomes slow and the processing time becomes long.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide X / C-axis data for controlling a headstock or a grinding wheel head in consideration of these limit values. It is an object of the present invention to provide a machined data creation device that can be created without any error and that prevents creation of erroneous X / C axis data due to an input error.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, a machine for machining a non-circular workpiece by controlling the rotation of a spindle and the reciprocating motion of a grindstone head is provided. Processing data of a non-circular workpiece for creating X / C-axis data of the rotation angle of the spindle and the moving position of the wheel head from the shape data representing the non-circular shape, the diameter of the grinding wheel, and the time required for one rotation of the workpiece. In the creating apparatus, increase / decrease of the acceleration with respect to the displacement of the X / C axis data created in consideration of the speed and acceleration limit values of the spindle and the grinding wheel head set or input in advance.
Is displayed as a graphic for one rotation of the workpiece, editing means for changing and setting the acceleration limit value on the graphic based on the output result, and the X value based on the edited limit value.
And a means for re-creating the C-axis data.

[0010]

According to the present invention, there is provided an apparatus for preparing machining data for a non-circular workpiece according to the present invention, wherein a non-circular shape of the workpiece is set in consideration of preset or inputted speed and acceleration limit values of a spindle and a grinding wheel head. Of the X / C axis data created from the shape data representing the diameter of the grindstone, and the time required for one rotation of the workpiece.
By displaying the increase / decrease of the acceleration with respect to the displacement as a graphic for one rotation of the workpiece, the rotation angle of the spindle and the X / C axis data of the moving position of the grinding wheel head can be easily distinguished visually. Since the editing means which can change and set the limit value on the figure is provided, input errors are prevented,
After the X / C-axis data is created again based on the edited limit values, the rotation of the spindle and the reciprocating motion of the grindstone head can be controlled so that the apparatus for processing a non-circular workpiece can be operated.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows an NC to which the present invention is applied.
FIG. 2 is a plan view of the grinding machine, in which a grinding wheel base 2 guided so as to be able to move back and forth toward a workpiece is placed above and behind the bed 1, and the grinding wheel base 2 is attached to the bed 1. The X-axis servo motor 7 can be moved and positioned via a ball screw 8. A grinding wheel 10 is provided with a motor 11
To be rotatable. On the front side of the bed 1, a table 5 is movably mounted on a sliding surface provided in the Z-axis direction, and a headstock 3 and a tailstock 6 are mounted on the table 5.
Is fixed so that the mounting position can be moved. Headstock 3
, A spindle 4 is rotatably supported, and the spindle 4 is rotated by a C-axis servomotor 9 attached to the headstock 3.
The workpiece 12 is supported by the chuck 13 and the tailstock 6 fixed to the tip of the spindle 4, and the rotation of the spindle 4 is transmitted without slippage.

FIG. 2 shows the configuration of the non-circular data pre-processing unit 30 and the numerical control unit 70. Data input from the keyboard 80 is input / output interface 81
Through the non-circular data pre-processing unit 30 and the numerical controller 70
And the limit value described later is displayed on the CRT 82,
The data is edited on the screen. Numerical control unit 7
Numeral 0 is a servo system for controlling each axis of the NC grinding machine. A RAM 72 in the servo system stores variables relating to machining programs and control axes. A ROM 73 relates to axis control read at power-on. This part stores software. The main processor 71 is used for processing the data. Servo processor 74
The drive unit 75 mainly performs an acceleration / deceleration process in response to an axis movement command value given from the main processor 71.
This is a part that gives a command for axis movement to. The drive unit 75 includes an X-axis drive unit 76 and a C-axis drive unit 77 that supply electric power for driving the servo motors 7 and 9 of each axis.

The non-circular data preprocessing unit 30 calculates X / C axis data from the given non-circular shape data in consideration of the grinding wheel diameter and the time required for one rotation of the workpiece. X / C modified so that the speed / acceleration / acceleration change of the table falls within the following limits of the machine, the grinding speed on the workpiece circumference approaches a constant, and the change of the contact arc length does not change suddenly. It has a function to create axis data.

A shape data storage unit 31 stores a shape data representing a non-circular shape, a grindstone diameter storage unit 32 stores a diameter of a grinding wheel, and a spindle rotation speed storage unit 33 stores a workpiece one rotation during machining. For storing the time required for
The / C-axis data storage unit 34 stores reference X / C-axis data which is the angle of the spindle with the position of the grindstone when the workpiece is brought into contact with the grindstone, and a corrected X / C-axis data storage unit 35.
Is the part that stores the X / C axis data corrected so that the calculated values of the speed, acceleration, change in acceleration, and the contact arc length of the spindle / grinding wheel are within the preset limit values. The storage unit 36 is a unit that stores preset values or input limit values of speed, acceleration, change in acceleration, and contact arc length of the spindle / grinding wheel head.

The cam profile calculation unit 50 converts a given angle and a point group of lift into contour data, the cam circumference calculation unit 51 calculates the length of the contour, and the profile division point calculation unit 52. Is a part that divides the obtained contour into minute and equal lengths, the reference X / C axis data calculation unit 5
Reference numeral 3 denotes a portion for calculating the position of the grinding wheel base and the angle of the main shaft when the grinding wheel is brought into contact with the equally divided points.

The processor 47 skips the reference X / C axis data for every predetermined number of steps and reads the data to calculate the change in speed / acceleration / acceleration of each axis. The X / C axis data is calculated based on the X / C axis data. X-axis acceleration change calculator 40 for calculating speed (angular velocity), acceleration (angular acceleration), and acceleration change (angular acceleration change), C-axis angular acceleration change calculator 4
1, an X-axis acceleration calculator 42, a C-axis angular acceleration calculator 43,
It comprises an X-axis speed calculator 44, a C-axis angular speed calculator 45, and a contact arc calculator for calculating the length of the contact arc during grinding. The X / C axis data correction unit 60 is a unit for reducing the number of steps and correcting the calculated value of the speed / acceleration / change of acceleration / contact arc length to be within the limit value when the calculated value exceeds the limit value. It is.

The RAM 22 is composed of an acceleration storage unit 20 and a contact arc storage unit 21 for recording the coordinates on the CRT 82 in which the limit value obtained by calculating the corrected X / C axis has been changed as the maximum value.
The limit change unit 25 calculates a new limit value from the maximum value and updates the limit value storage unit 36.

Next, the operation of the embodiment of the present invention will be described with reference to the flowchart of FIG. In step 1, reference X / C axis data is read. This reference X / C axis data is created by the following procedure. First, the input shape data representing the non-circular shape is stored in the shape data storage unit 31, and the given angle and lift points are converted into data representing the contour of the workpiece by the cam profile calculation unit 50. From this data, the circumference of the non-circular workpiece is calculated by the cam circumference calculation unit 51. Next, a point group for dividing the contour into minute and equal lengths is obtained by the profile division point calculation unit 52.
From those points and the diameter of the grinding wheel in the grinding wheel diameter storage unit 32,
The arithmetic unit 53 calculates reference X / C axis data, which is the angle between the position of the grindstone base and the spindle when the workpiece and the grindstone are brought into contact. Those data are stored in the reference X / C axis data storage unit 34. The reference X / C axis data operates at a speed / acceleration / acceleration change sufficiently lower than the following limit of the machine, and is generated so that the grinding speed on the workpiece circumference becomes constant.

Next, in step 2, the X / C axis data correction unit 60 stores the time required for one rotation of the workpiece during machining stored in the spindle rotation speed storage unit 33 and the machining required when machining with the reference X / C axis data. The number of steps to be used when creating new X / C-axis data is determined from the time of one rotation of the object, and the reference X / C-axis data is skipped by the determined number of steps, and the new X for one section of one revolution of the cam is skipped. / Create C-axis data.

Next, the processor 47 calculates the speed, acceleration, acceleration change, and contact arc length for the new X / C axis data. First, in step 3, the X-axis speed calculator 44 calculates the X-axis speed of the new X / C-axis data, and the C-axis angular speed calculator 45 calculates the C-axis angular speed of the new X / C-axis data. In step 4, the X-axis speed of the new X / C-axis data obtained,
It is checked whether or not each of the C-axis angular velocities exceeds the speed limit. If the respective speeds exceed the speed limit (YES), the speed reduction processing is performed in step 5, and the new X /
The X-axis speed and the C-axis angular speed of the C-axis data are respectively calculated, and it is checked again in step 4 whether the speed limit is exceeded. The speed reduction process in step 5 is to create new X / C axis data again by reducing the number of steps skipped in step 2.

If the X-axis speed and the C-axis angular speed do not exceed the speed limit (NO), the X-axis acceleration calculating section 42 calculates the X-axis acceleration of the new X / C-axis data in step 6 and calculates the C-axis angular acceleration. The unit 43 calculates the C-axis angular acceleration. In step 7, it is checked whether the X-axis acceleration and the C-axis angular acceleration of the obtained new X / C-axis data have exceeded the acceleration limits. Then, the X-axis acceleration and the C-axis angular acceleration of the new X / C-axis data are calculated again in step 6, and it is checked again in step 7 whether the acceleration limit is exceeded. The acceleration reduction process in step 8 is performed in the same manner as the speed reduction process in step 5.

If the X-axis acceleration and the C-axis angular acceleration do not exceed the acceleration limit (NO), in step 9 the X-axis acceleration change calculator 40 calculates the change in the X-axis acceleration of the new X / C-axis data into the C-axis. The angular acceleration change calculator 41 calculates the angular acceleration change of the C axis. In step 10, it is checked whether the X-axis acceleration change and the C-axis angular change of the obtained new X / C-axis data exceed the limit of the acceleration change. In step 9, the acceleration change reduction processing is performed. In step 9, the change in the X-axis acceleration and the change in the angular acceleration of the C-axis of the new X / C-axis data are respectively calculated. Do. The acceleration change reduction process in step 11 is performed in the same manner as the speed reduction process and the acceleration reduction process in steps 5 and 8.

If the change in the X-axis acceleration and the change in the C-axis angular acceleration do not exceed the limit of the change in the acceleration (NO), in step 12, the new X / C-axis data and the grinding wheel diameter storage unit 32
The contact arc length is calculated by the contact arc length calculation unit 46 from the grindstone diameter stored in the contact arc (the method for calculating the contact arc will be described later). If the determined contact arc length exceeds the limit of the contact arc in step 13 (YES), step 14 is executed.
, The contact arc length of the new X / C axis data is calculated again in step 12, and it is checked again in step 13 whether the contact arc length exceeds the limit. The contact arc length reduction process is performed in the same manner as the speed reduction process, the acceleration reduction process, and the acceleration change reduction process in Steps 5, 8, and 11.

If the contact arc length does not exceed the limit (N
In step O), the new X / C-axis data in this state is stored as corrected X / C-axis data in the corrected X / C-axis data storage unit 35 in step S15. In step 16, the modification X
It is checked whether the / C-axis data has been created for one round of the workpiece. If the creation of all sections has not been completed (NO), the process returns to step 2 with n = n + 1 in step 17 and corrects the next section. The X / C axis data creation operation is repeated, and when completed (YES), the correction X / C
The creation of the C-axis data is completed.

Next, a method of calculating a contact arc will be described with reference to FIG. Based on the new X / C axis data obtained in step S2, the point P1 at which the grinding wheel 10 and the workpiece 12 come into contact can be obtained. From this point P1, an original outline F is obtained, which is separated by the thickness of the allowance from which the workpiece 12 has been rotated once and removed. Next, an intersection P2 between the outline F indicated by the dotted line and the circle Rw indicating the radius of the grindstone is determined. This intersection P2
And the point P1 at which the grinding wheel 10 and the workpiece 12 contact each other, an arc Rg is obtained. The contact arc length can be approximated by multiplying the arc Rg by the movement angle dθ of the C-axis data.

As described above, the length of the contact arc, which is the chip length at which one abrasive grain grinds the workpiece during one rotation of the grinding wheel, is taken into consideration along with the acceleration and the peripheral speed of the grinding wheel table, and the X / C By creating the axis data, grinding burns and grinding cracks can be prevented. Conventionally, for a non-circular workpiece such as a cam, the contact arc changes depending on the rotation angle of the workpiece, even if a grinding method with a constant peripheral speed is used. As shown in FIG. 5, when the same cam is used to grind a portion where the distance from the center of rotation to the outer surface is continuous (a)
With respect to the contact arc A, when grinding the portion where the distance from the center of rotation to the outer surface changes, the length of grinding sharply increases with the contact arc B in FIG. In the part where this contact arc becomes sharply long, the work load of one abrasive grain increases, and the grinding heat increases,
Grinding burns and grinding cracks occur. In such a state, the load on the abrasive grains increases, and the life of the grindstone is shortened. Also, based on the X / C axis data created in consideration of the contact arc length, it is necessary to determine whether the reduction rate of the speed is appropriate or not by trial and error from the result of grinding as in the past. For example, if there is grinding burn or grinding cracking as a result of grinding, the change in the length of the contact arc is estimated from those locations, and it is determined whether the rate of reduction in speed is appropriate. If you change the conditions again,
Extremely troublesome work such as calculating C-axis data and repeating rework can be omitted. Furthermore, since the length of the contact arc at the time of grinding is taken into consideration, the grinding resistance becomes substantially constant, and a highly accurate product free of grinding burns and grinding cracks can be created without any expert knowledge on data creation. Further, since the fluctuation of the force applied to the grindstone is reduced, the life of the grindstone is prolonged, which is effective for maintaining the accuracy of the product.

FIGS. 6 and 7 show how the calculated values of speed, acceleration, change in acceleration, and contact arc length are reduced to within the limit values by taking a process of reducing the contact arc length as an example. A specific description will be given based on this. FIG. 6 is an example of a curve representing the reference X / C axis data. L1, L2, L3, L4 ...
L7 indicates reference X / C axis data. Dn-2, Dn-1, D
n is the corrected X / C axis data. In this example, the corrected X / C axis data from the new X / C axis data obtained by skipping the reference X / C axis data at intervals of 3 steps to Dn-1 is stored, and the corrected X / C data for the next section is stored. Attempting to create axis data Dn.

FIG. 7 details step 14 of FIG. 3. For example, in step 2, L7 is converted to new X / C axis data of Dn. In step 12, the contact arc length between Dn-1 and Dn in this case is obtained. In step 13, it is checked whether or not the contact arc length exceeds the contact arc length limit. Step 14
In step 141, the number of steps is reduced from a predetermined number 3 to 2 in step 141, and L2 is newly set as new X / C axis data of Dn. In S142, it is confirmed whether Dn according to the new X / C axis data is the same as Dn-1, and in this case, L4 is not the same as L6 (N
O) Therefore, the process returns to step 12, and the contact arc reduction processing ends.
In step 12, the contact arc length is obtained again, and in step 13, it is confirmed whether the calculated value of the contact arc length is within the limit. In this manner, the contact arc reduction process of reducing the number of steps until the contact arc length falls within the limit is repeated.

In step 13, the contact arc length exceeds a predetermined limit, and the contact arc reducing process for reducing the number of repetition steps is performed. As a result, the new X / C axis data of Dn is replaced with the immediately preceding corrected X / C axis data Dn-1. In this example, Dn-1 = D
If n = L4, the previous modified X / C-axis data Dn-1 is recreated. In step 142, it is confirmed that Dn and Dn-1 are the same (YES), and in step 143, the modified X / C-axis data Dn-1 immediately before returning and storing one as n = n-1, is deleted. The number of steps determined is reduced by one, and new X / C axis data of Dn-1 is newly created as L3.
The contact arc length between -Dn-1 is determined, and it is confirmed in step 13 whether the contact arc length determined is within the limit. As a result, when the contact arc length of the new X / C axis data of Dn-1 has settled within the limit (YES), the operation after step 15 in FIG. 3 is continued, and the returned new X / C axis data is returned. After storing L3 as the immediately preceding corrected X / C axis data Dn-1, in this example, the next corrected X / C axis data Dn is created from the new X / C axis data L6 and the predetermined number of steps 3. . If the contact length of the new X / C-axis data of Dn-1 is still beyond the limit in step 13 (NO), the number of steps is reduced again in step 141. In this example, Dn-1
The new X / C axis data is set to L2, and thereafter, the same contact arc reduction processing as described above is repeated. As described above, the corrected X / C-axis data is sequentially created to obtain the corrected X / C-axis data for one round of the workpiece, and the corrected X / C-axis data is stored in the corrected X / C-axis data storage unit 35. Such calculation is sequentially performed for one rotation of the cam, and all the corrected X / C axis data used for grinding are stored.

Next, in step 17 of FIG. 8 which is a flowchart subsequent to FIG. 3, the corrected X / X value in which the calculated values of the speed, acceleration, acceleration change, and contact arc length are reduced to the limit values is set.
The acceleration and the contact arc length of the C-axis data are output as a graph as shown in FIG. In FIG. 9, the horizontal axis represents time elapsed from the start of grinding, the vertical axis represents the same upper and lower graphs 91 and 91 representing the amount of movement of the grinding wheel head, the graph 92 representing the acceleration of the grinding wheel head, and the contact arc. Is represented by a graph 93. The amount of movement of the grinding wheel head is the same as the acceleration and contact arc length, and the displacement of the X / C axis data is
Since the increase and decrease of the acceleration and the contact arc length are displayed, it is possible to confirm whether the magnitude of the acceleration and the length of the contact arc are valid in a portion where the shape accuracy of the cam is required. The maximum value of each graph is indicated by a peak 94 of the acceleration and a peak 96 of the length of the contact arc displayed by the marker on the vertical axis. In step 18, when the operator wants to change the magnitude of the acceleration limit value to adjust the acceleration limit value in accordance with the shape accuracy required for the cam, intuitively from the curve on the CRT, The marker is moved up and down by the ↑ / ↓ keys of the keyboard 81 to change the acceleration limit value. Since there is no need to input numerical values in this way, input errors can be prevented.

Next, in both the case where the editing of the acceleration is completed and the case where the editing is not performed, the limit value of the length of the contact arc is similarly moved in step 19. The marker moved by the ↑ / ↓ keys can be switched between the acceleration graph and the contact arc length graph by the ← / → keys.
The limit value of the contact arc length also needs to be adjusted depending on the material of the workpiece, the heat treatment method, and the material of the grindstone used for grinding. For example, for a workpiece that has not been heat treated,
When using a CBN wheel, the first consideration must be that the abrasive grains are not worn away by the grinding heat. On the other hand, in the grinding of a heat-treated cam, rather than the wear of abrasive grains,
Care must be taken because the state change of the heat treatment state due to the grinding heat occurs from the low temperature state. Therefore, when grinding a non-heat-treated material, the contact arc can be set longer than when grinding a heat-treated cam, so that the rotation speed of the cam increases and machining efficiency can be improved. Note that peak 94,
The numerical value of 96 is directly set to the maximum value 95, 97 and the CRT 82
On the display to allow the operator to make minute adjustments,
Instead of the ← and → keys, a character key such as a U key indicating an upward direction or a D key indicating a downward direction may be used to deal with a keyboard without arrow keys.

In step 20, it is determined whether or not the marker has been moved. If it is determined that the marker has been moved in one of the graphs, the CR of the moved marker is determined in step 21.
From the coordinates on T, the respective limit values are updated by a limit value updating unit 25.
In step 22, the new limit value is updated to the limit value of the acceleration or the length of the contact arc in the limit value storage unit 36. Then, according to the limit value updated in step 23,
Recalculation is performed from the reference X / C axis data to create edited X / C axis data. If it is determined in Step 20 that the marker is not moved in both graphs, Step 1
Edit the modified X / C axis data created in
Let it be C-axis data.

The edited X / C axis data processed as described above is output as a data file to the external storage device in step 25. As a result, when a grinding part program for executing a cam generating movement is created, the conventional grinding part program shown in FIG.
Although an enormous amount of point cloud data is written as it is like 102 in 0 (a), the program can be made small and simple because the data file name can be one line as 101 in FIG. 10B. Further, when copying the X / C axis data in order to process a cam having the same shape with another grinding machine, the portion of the program to be copied is not mistaken compared to the case where the data is represented by a point cloud. The non-circular workpiece is machined by controlling the rotational motion of the spindle and the reciprocating motion of the grinding wheel head based on the edited X / C axis data obtained in this manner.

It should be noted that these functions have the same effect even if they are performed by another computer, so that they need not necessarily be incorporated in the numerical controller.

[0035]

As described in detail above, according to the present invention,
After calculating the corrected X / C axis data in consideration of the speed and acceleration limit values of the spindle and the grinding wheel head set or input in advance in the processing data creation device for the non-circular workpiece, at least the displacement of the X / C axis data and Acceleration is calculated as C for one rotation of the workpiece.
By viewing the operator as a graphic at RT, the X / C-axis data of the wheel head moving position with respect to the rotation angle of the spindle can be edited in a visually easy-to-understand manner. Further, an editing means for changing and setting the acceleration limit value on the graphic based on the output result is provided, and the numerical input is completely eliminated. And the like, and an excellent effect that processing efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a numerically controlled grinding machine to which the present invention is applied.

FIG. 2 is a diagram showing an electrical configuration of the numerically controlled grinding machine of FIG. 1;

FIG. 3 is a flowchart showing a calculation operation of corrected X / C axis data in one embodiment of the present invention.

FIG. 4 is a diagram showing a method of obtaining a contact arc.

FIG. 5 is a diagram illustrating a change in a contact arc in a non-circular workpiece.

FIG. 6 is a diagram showing a curve representing a relationship between a rotation angle of a spindle and a reciprocating motion of a grinding wheel head.

FIG. 7 is a flowchart showing a specific operation of the acceleration reduction processing of FIG. 3;

FIG. 8 is a flowchart continued from FIG. 3, illustrating an operation of calculating edited X / C axis data.

FIG. 9 is an explanatory diagram showing a moving amount of the grinding wheel head, an acceleration of the grinding wheel head, and a contact arc length on a CRT.

FIG. 10 is an explanatory diagram in which edited X / C axis data is written in a part program.

[Explanation of symbols]

1. Bed, 2. Wheelhead, 3. Headstock, 4. Spindle, 6. Tailstock, 7 X-axis servomotor, 9. C-axis servomotor, 10. Wheelhead, 34. · Reference X / C axis data storage unit, 35 · · · Corrected X / C axis data storage unit, 36
..Limit value storage section, X-axis acceleration change calculation section, 4
1 ··· C-axis angular acceleration change calculator, 42 ··· X-axis acceleration calculator, 43 ··· C-axis angular acceleration calculator, 44 ··· X-axis speed calculator, 45 ··· C-axis angular speed calculator, 46 · .Contact arc calculator, 47,54..processor, 53..reference X / C
Axis data calculation unit, 60 ··· X / C axis data correction unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G05B 19/409

Claims (2)

(57) [Claims] An apparatus for processing a non-circular workpiece by controlling a spindle rotation and a reciprocating motion of a grindstone head, for processing a non-circular workpiece, shape data representing a non-circular shape of the workpiece, a diameter of a grinding wheel, In the processing data creation device for a non-circular workpiece which creates the X / C axis data of the rotation angle of the spindle and the moving position of the grinding wheel head from the time required for one rotation of the workpiece, the speed of the spindle and the grinding wheel head set or input in advance. And displacement of X / C axis data created in consideration of the limit value of acceleration
Means for displaying the increase or decrease of the acceleration with respect to one rotation of the workpiece as a graphic, editing means for changing and setting the acceleration limit value on the graphic from the output result, and the X / C by the edited limit value. Means for re-creating axis data. 2. In addition to the acceleration according to claim 1, the whetstone is 1
Chips in which one grindstone grinds the workpiece while rotating
Create X / C axis data from contact arc length
Processing data creation device for circular workpieces.