JPH07314312A - Data compensator - Google Patents

Abstract

PURPOSE:To make data correctable as checking a minute correction on a picture plane. CONSTITUTION:A graph display is performed on the basis of a plot point conformed to data of lift value, speed and acceleration based on the lift data by a graph display means 1. In addition, a moving means 2 performs its movement to the graph's plot point displayed, and a travel calculating means 3 calculates an amount of travel in this plot point at that time, and thus this travel value is graphicly displayed by a travel graphic display means 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data correction device for correcting at least one of lift amount, speed and acceleration data based on lift data for specifying a contour shape of a cam.

[0002]

2. Description of the Related Art Generally, the shape of a cam of a camshaft used in an engine is such that a moving amount H of the tappet T when the cam C contacts the tappet T is determined from a predetermined reference position of the cam C as shown in FIG. It is represented as lift data corresponding to the rotation angle of. In a numerically controlled grinding machine that grinds this cam, the work that is rotatably clamped between the tailstock and the headstock of the grinding machine is synchronized with the rotation of the spindle, and the grinding wheel is moved in the direction perpendicular to the spindle axis. Grinding is performed with advance / retreat control.
In order to control the position of the grinding wheel and the rotation angle of the spindle at this time, the above-mentioned lift data is divided into angles θ at equal intervals as shown in FIG. 13, and the distance from the rotation center for each angle θ is divided. (Polar coordinates) r (θ) and then the distance between the spindle axis and the center position of the grinding wheel (center-to-center distance), and then the center-to-center distance, the rotation speed of the spindle, the diameter of the grinding wheel, etc. The profile data is calculated by taking into account the specification data during grinding.

[0003]

Conventionally, in this type of numerically controlled grinding machine, the above-mentioned lift data is automatically converted into profile data, and the data is confirmed by inputting. The lift data or profile data was checked on the CRT screen or printed.

However, checking the data one by one as described above requires a great deal of labor. Also,
The profile data is the final output data.Even if there is an abnormality in this profile data, check all the data to see if there is an error in the specification data used in the process or in the lift data itself. I don't know without it. In addition, lift data is often obtained using experimentally determined values, and as a result, error data that is unnecessary for creating profile data may be included. It was not possible to understand what kind of influence it would have on the shape of the above unless it was processed.

In order to solve the above-mentioned problems, the first object of the present invention is to make it possible to easily find an error such as erroneous input of lift data, and to make it possible to easily correct this data. It is intended.

[0006]

The present invention has been made to solve the above-mentioned problems, and the invention described in claim 1 specifies the contour shape of the cam as shown in FIG. Graph display means 1 for displaying a graph on the basis of the lift data, and a plot point corresponding to at least one data of velocity and acceleration, and moving means 2 for moving the plot point of the data displayed in the graph. , A movement amount calculation means 3 for calculating the movement amount of the plot point moved by the movement means 2, and a movement amount graph display for displaying a movement amount graph based on the movement amount calculated by the movement amount calculation means 3. And means 4 are provided.

According to the second aspect of the present invention, the movement amount calculating / calculating means includes a data designating means for designating a plurality of data including plot points of data to be moved by the moving means, and the data designating means. Between the data moved by the moving means, and the end-point specifying means for obtaining the start-point and end-point data among the plurality of data specified by It is composed of a data interpolating means for interpolating.

[0008]

According to the first aspect of the present invention, the graph display means 1 displays the graph based on the plot points corresponding to at least one of the lift amount, the velocity and the acceleration based on the lift data. Then, the moving means 2 moves with respect to the plotted points of the displayed graph, and the moving amount calculating means 3 calculates the moving amount of the plotted points at this time,
According to the invention of claim 2, a plurality of data including plot points of the data moved by the moving means 2 is designated by the data designating means, and the data is displayed by the data designating means. From the plurality of data designated by the designating means, the end-point designating means obtains start-point and end-point data, and the data interpolating means moves by the moving means and the start-point and end-point data designated by the end-point designating means. Data correction is performed by interpolating between the generated data.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 2, reference numeral 10 denotes a numerical control grinding machine. The numerical control grinding machine 10 is roughly divided into a grinding machine main body 20, a numerical control device 30, and an automatic programming device 40.

The grinder main body 20 is constructed as shown in FIG. 2. Reference numeral 21 is a bed of a numerical control grinder, and a servo motor 27 is provided on the bed 21 via a feed screw mechanism.
A table 22 driven by is arranged slidably in a direction parallel to the axis of the spindle. A headstock 23 having a main shaft 24 mounted thereon is arranged on the table 22, and the main shaft 24 is rotated by a servomotor 25. Also, table 2
A tailstock 26 is placed on the right end of the upper part of the upper part 2 and a workpiece W composed of a camshaft is clamped by a center 30 of the tailstock 26 and a center 28 of the spindle 24. Workpiece W has spindle 24
The rotation phase of the work W coincides with the rotation phase of the main shaft 24 by engaging with the positioning pin 29 projecting from the.

Behind the bed 21, a tool base (grinding stone base) 31 capable of moving forward and backward toward the workpiece W is guided, and a grindstone wheel G rotatably driven by a motor 32 is supported on the tool base 31. . The tool base 31 is connected to a servo motor 34 via a feed screw (not shown), and is moved forward / backward by the forward / reverse rotation of the servo motor 34. Drive unit 5
Reference numerals 0, 51 and 52 are circuits for inputting command pulses from the numerical control device 30 and driving the servo motors 34, 25 and 27, respectively.

The numerical control device 30 is a device that mainly controls the rotation of the control shaft to control the grinding of the workpiece W and the correction of the grinding wheel G. As shown in FIG. 3, the numerical controller 30 is mainly composed of a main CPU 31 for controlling the grinder, a ROM 33 storing a control program, and a RAM 32 storing input data and the like. RAM
An NC profile data area 321 for storing machining NC profile data is formed at 32.

The numerical controller 30 includes a drive CPU 3 as a drive system for the other servomotors 34, 25 and 27.
6, a RAM 35, and a pulse distribution circuit 37 are provided. The RAM 35 is a storage device for inputting positioning data for the grinding wheel G, the table 11, and the spindle 13 from the main CPU 31. The drive CPU 36 is a device that performs operations such as slow-up, slow-down, and interpolation of a target point for feeding the control axis relating to machining, and outputs the positioning data of the interpolation point at a fixed cycle. The pulse distribution circuit 37 is a drive CPU 36.
After distributing the positioning data output from the
The movement command pulse is sent to each drive unit 50, 51, 52.
It is a circuit that outputs to.

An automatic programming device 40 is connected to the numerical control device 30 and automatically creates profile data from the lift data and the grindstone diameter. The automatic programming device 40 includes a front CPU 70 and an RO.
The M71, the RAM 72, the image processing device 74, and the input / output interface 73 are the main constituent elements, and the front CP
U71 has an image display device (CRT) 75 and a keyboard 7.
6, and external input / output devices such as the screen indicating device 77 are connected.

The RAM 72 has a lift data area 721 for storing lift data Li of a plurality of workpieces, a polar coordinate lift data area 722 for polar coordinate conversion and storage of the lift data Li, and data obtained by converting polar coordinate data P into profile data CX. Profile data area 723 storing
And a speed data area 725 for storing speed data SLi obtained from the shape of the lift data Li, an acceleration data area 726 for storing acceleration obtained from the shape of the lift data Li, and a grinding wheel diameter R of the grinding wheel G. A grindstone diameter storage area 727, a spindle rotation speed area 728 that stores the rotation speed of the spindle 13, a base circle data area 729 that stores data of the base circle of the workpiece, and a cursor position storage area 730 are formed.

The ROM 71 also stores a calculation program for calculating various data and display screen data to be displayed on the CRT 75. On the other hand, the keyboard 76 is provided with a key for inputting a numerical value, an end key 76a, a key for selecting an instruction item displayed on the screen, and the like.
The screen instruction device 77 is a known mouse device for instructing and selecting a specific position on the screen with an arrow or the like.
a.

In the above configuration, when the automatic programming device 40 is powered on and when the keyboard 7 is used.
When the end key 76a of No. 6 is pressed, the main flowchart shown in FIG. 4 is executed. When the main flow chart is executed, it is determined in step 100 whether lift data has already been input. If lift data has already been input, the process proceeds to step 102, and if lift data has not been input yet. In step 104, lift data including the rotation angle θ and the lift amount r as shown in FIG. 13 is input from the keyboard 76 and stored in the lift data storage area 721.

At step 102, the lift data Li is differentiated by the rotation angle θ to obtain speed data SLi, which is stored in the speed data area 725, and then step 105.
Then, the lift data Li is differentiated twice by the rotation angle θ to obtain the acceleration data ALi, which is stored in the acceleration data area 726, and the routine proceeds to step 106. In step 106, the data obtained in steps 102 to 106 above is sent to the CRT 7
The display process shown in FIG. 5 is executed. Next, the display process shown in step 106 will be described with reference to the flowchart of FIG.

The initial menu screen shown in FIG. 6 is displayed to determine whether the data displayed in step 300 of FIG. 5 is lift data Li, speed data SLi, or acceleration data ALi. Which of the Li, the speed data SLi, and the acceleration data ALi is displayed is determined by pressing the determination key 77a of the screen instructing device 77. After that, the process proceeds to step 301.

In step 301, the data determined in step 300 (lift data Li, speed data SLi
Alternatively, the acceleration data ALi) is the lift data area 72.
1, speed data area 725, acceleration data area 726
Read from. Next, at step 302, the maximum numerical value of the data to be displayed is set, and the routine proceeds to step 306. In step 306, the minimum step value of the scale is calculated based on the set maximum value of the scale. Then, in step 308, the data point position on the screen of the CRT 75 is calculated from this minimum step value, and step 310
At, each data point is plotted on the screen of the CRT 75, and the points are connected. When this process is executed, the screen of lift data Li as shown in FIG.
It will be displayed on T75.

The display contents of the screen shown in FIG. 7 will now be described. It is divided into a graph display screen 90, a data display screen 91 and a correction amount display screen 92. The graph display screen 90 displays the lift data Li as a graph. It is a converted screen. In this graph display screen 90, the horizontal axis shows the rotation angle corresponding to one rotation of the cam, and the vertical axis shows the scale of the lift amount. The scale of this lift amount is shown in FIG.
The minimum increment value determined in step 306 is displayed as the minimum unit. Further, on the graph display screen 90, an arrow 93 and a cursor 96a for selecting the correction position of the graph are displayed.

An arrow 93 moves on the screen by operating the screen instructing device 77, and causes the enter key 77a provided in the screen instructing device 77 to execute a process based on the display on the screen. When the enter key 77a is pressed on the graph on the graph screen 90, the cursor 96a is moved to the position of the arrow 93, and when the enter key 77a is continuously pressed, the arrow 93 is moved. 8 is an enlarged view of portion C shown in FIG. 7 from a start position A where the enter key 77a is pressed to an end position B where the enter key 77a is released.
The correction range is determined as shown in (a), and the data of the graph displayed in this correction range is taken in.

The cursor 96a is used in a data correction process described later and is displayed on the screen based on the X and Y position data stored in the cursor position storage area 730 of the RAM 72. In the X and Y position data stored in the cursor position storage area 730, the lower left in FIG. 8 is the reference position 0, the right direction is the X direction, and the upper direction is the Y direction.

The data correction amount display screen 92 displays the amount of data correction, where the vertical axis is the correction amount and the horizontal axis is the rotation angle. Note that the scale of the correction amount on the vertical axis is, for example, 1/100 times the minimum step value determined in step 306 of the flowchart of FIG. 7 (the minimum step value is 1 m.
If m, it is displayed on a scale of 10 μm). Further, the data correction amount display screen 91 is provided with a cursor 96b that moves in correspondence with the position of the cursor 96a in the rotation angle direction.

On the other hand, the acceleration data and a part of the lift data are displayed on the data display screen 91 with reference to an angle corresponding to the acceleration data.
Based on the position data in the X direction stored in the cursor position storage area 730, it is converted into an angle on the graph, and acceleration data ALi and lift data Li having an angle closest to the converted angle are used as the front and rear two, respectively. Always display 5 data.

On the data display screen 91, the cursor 9
6a for moving the cursor and a graph moving key 94 for changing the scale of the graph display screen 90.
Is provided. This cursor movement key 95 is shown in FIG.
This is an execution switch of the flowcharts shown in FIGS. 10 and 11, and will be described below with reference to FIGS. 9, 10 and 11.
The flowchart will be described.

In the flow chart of FIG. 9, the cursor 96a is moved as described above and the acceleration data ALi
And the up / down / left / right movement keys of the minute movement key 95a inside the cursor movement key 95 and the up / down / left / right movement keys of the outer small movement key 95b are indicated by the arrow 93. This is executed when the enter key 77a of is pressed.

First, in step 500, the arrow 74 described above is used.
It is determined whether or not the correction area is specified by
If the correction area is not specified, the process is terminated, and if the correction area is specified, the process proceeds to step 501. When it proceeds to step 501, it is determined whether or not it is the minute movement key 95a. If it is the minute movement key 95a, the routine proceeds to step 504, and if it is not the minute movement key 95a, the routine proceeds to step 502. In step 504, it is determined whether or not the minute movement key 95a that has been pressed is the up / down movement key, and if it is the up / down movement key, the process proceeds to step 506 to determine whether or not it is the up movement key. If it is the up move key, the minimum unit move amount is added to the Y data of the position data of the cursor position storage area 730 of the RAM 72 to update the cursor position in step 508, and the acceleration data correction process of step 509 is performed, and step 524 Proceed to.

If the key is the down key instead of the up key, the minimum unit movement amount is subtracted from the Y data in step 510 to update the cursor position, and the flow advances to step 509. If it is determined in step 504 that the key is not the up / down movement key but the left / right movement key, it is determined in step 512 whether it is the right movement key.
X of the position data in the cursor position storage area 730 of M72
The minimum unit movement amount is added to the data to update the cursor position, and the process proceeds to step 521. If it is not the right movement key but the left movement key, the minimum unit movement amount is subtracted from the X data in step 516 to update the cursor position, and step 521
Proceed to. Then, in step 521, the screen indicating device 77
It is determined whether or not the decision key 77a has been pressed. If the decision key 77a has been pressed, the process proceeds to step 509, and if not, the process proceeds to step 524, where the position data X, Y of the cursor position storage area 730 is stored. The cursor 96a is displayed on the basis of the position of the cursor 96b based on the correction amount Δai, which will be described later, as well as the data of X indicating the position in the rotation angle direction of the position data X and Y of the cursor position storage area 730 in step 526. Is displayed.

On the other hand, if it is determined that the small movement key has been operated and the processing proceeds to step 502 and thereafter, then it is determined whether or not the minute movement key 95a pressed is the up / down movement key as in step 504 of the minute movement described above. If it is the up / down movement key, the process proceeds to step 515 to determine whether it is the up movement key. If it is the up movement key, in step 519, it is moved to the Y data of the position data in the cursor position storage area 730 of the RAM 72 by a predetermined amount. The amount (however, larger than the minimum movement amount) is added to update the cursor position, and the process proceeds to step 509. If it is not the up move key but the down move key, the predetermined amount of move amount is subtracted from the Y data in step 518 to update the cursor position, and the process proceeds to step 509.

If it is determined in step 502 that the key is the left / right key instead of the up / down key, it is determined in step 517 whether the key is the right key, and if it is the right key, the cursor of the RAM 72 is determined in step 520. Position storage area 7
The predetermined movement amount is added to the X data of the position data of 30 to update the cursor position, and the process proceeds to step 521. If it is not the right move key but the left move key, the predetermined amount of move amount is subtracted from the X data in step 522 to update the cursor position,
Go to step 521. Then, in step 521, it is determined whether or not the enter key 77a of the screen indicating device 77 has been pressed. If the enter key 77a has been pressed, step 5
09, if not pressed, the process proceeds to step 524, where the position of the cursor 96a is displayed based on the position data in the cursor position storage area 730, and in step 526, the position data X and Y in the cursor position storage area 730 are displayed. Of these, the position of the cursor 96b is displayed based on X data indicating the position in the rotation angle direction and a correction amount Δai described later.

Here, the data correction processing of step 509 will be described in detail with reference to the flowchart of FIG.
In step 550, X data (converted into angle data) is extracted from the cursor position stored in the cursor position storage area 730, and in step 552, the lift data L having the closest angle is searched from among the lifts Li. Subsequently, in step 554, the retrieved lift data L
And the cursor position stored in the cursor position storage area 730 are compared, and the correction amount Δθ and Δa of the angle θ and the lift amount a are compared.
Is calculated from the following formula.

Δa = a−Y Δθ = θ−X (where Y and X are converted into acceleration and angle on the screen). At the same time, the lift data L is stored in the cursor position storage area 7.
The data at the cursor position stored in 30 is replaced.
Then, in step 556, as shown in FIG. 8A, the rotation angles in the surrounded by the correction area are the lift data Li at the first point S and the last point E and the lift data corrected by the cursor. Interpolation between points is performed based on the point P.
(See FIG. 8B.) The interpolation processing performed in step 556 is performed by, for example, a known three-dimensional spline interpolation or a predetermined curve equation.

Further, in step 558, the interpolated interpolation curve is compared with the lift data designated in the area to obtain the corrected lift data of the lift data of the corresponding rotation angle, and the corrected lift data is stored in the lift data area.
At 0, the correction amount Δai at each point is obtained, and at step 561, the data correction amount display screen 92 is displayed based on the correction amount Δai.
Display a graph on. Then, step 308 and step 310 of the display process of FIG. 7 are executed, and the process proceeds to step 524.

Lift data L corrected in this way
After Ai is converted into the above-mentioned center-to-center distance, profile data is created based on the spindle rotational speed in the spindle rotational speed region and the grindstone diameter in the grindstone diameter storage area, and this profile data is NC in the RAM 32 of the numerical controller 30. It is transferred to the profile data area 321. Further, if the corrected data is speed data, it is integrated by the rotation angle, and if it is acceleration data, it is integrated twice by the rotation angle to obtain corrected lift data, and from this corrected lift data, the spindle in the spindle speed region is corrected. Profile data is created based on the number of revolutions and the grindstone diameter in the grindstone diameter storage area, and this profile data is transferred to the NC profile data area 321 of the RAM 32 of the numerical controller 30.

By enlarging and displaying the correction amount of the lift data on the data correction amount display screen 92 as described above, the correction amount can be displayed on the screen even when a minute correction that cannot be displayed on the graph of the graph display screen 90 is made. There is an advantage that the data can be confirmed and the data can be corrected with high accuracy. Further, since the correction is performed by designating the range, a plurality of plot points can be collectively corrected, and the correction time can be greatly shortened.

[0037]

As described above, in the present invention,
A graph is displayed based on the lift data, and a plot point corresponding to at least one of the data of the lift amount, the velocity, and the acceleration, the plot point of the displayed graph is moved, and the movement amount is calculated. Since the movement amount is displayed as a graph, the correction amount can be confirmed on the screen even when a slight correction is made, and accurate data correction can be performed.

If a range including a plurality of plot points is designated and the data can be corrected by interpolating between the plot points within the range, the data corresponding to the plurality of plot points can be collectively corrected. This has the advantage that the correction time can be greatly shortened.

[Brief description of drawings]

FIG. 1 is a block diagram showing the concept of the present invention.

FIG. 2 is a diagram showing a numerically controlled grinding machine according to an embodiment of the present invention.

FIG. 3 is a diagram showing a numerical controller and an automatic programming device according to an embodiment of the present invention.

FIG. 4 is a flowchart for performing lift data correction processing according to the embodiment of the present invention.

FIG. 5 is a flow chart for performing lift data correction processing according to the embodiment of the present invention.

FIG. 6 is a diagram showing an initial menu screen.

FIG. 7 is a diagram showing a graph display state.

FIG. 8 is an enlarged view of portion C of FIG. 7.

FIG. 9 is a flowchart for performing lift data correction processing according to the embodiment of the present invention.

FIG. 10 is a flow chart for performing lift data correction processing according to the embodiment of the present invention.

FIG. 11 is a flowchart for performing lift data correction processing according to the embodiment of the present invention.

FIG. 12 is a diagram showing shape data of a cam.

FIG. 13 is a diagram showing shape data of a cam. 10 ... Numerical control grinding machine 20 ... Grinding machine main body 30 ... Numerical control device 40 ... Automatic programming device 70 ... Front CPU 72 ... RAM 75 ... Image display device (CRT) 76 ... Keyboard 77 ... Screen indication device (mouse)

Claims (2)

[Claims] 1. A graph display means for displaying a graph based on a lift point, a lift point, and at least one plot of data corresponding to at least one of speed and acceleration based on lift data for specifying a contour shape of the cam, and the graph display means. Moving means for moving the plot points of the data, moving amount calculating means for calculating the moving amount of the plot points moved by the moving means, and moving amount graph based on the moving amount calculated by the moving amount calculating means And a graph for displaying a moving amount for displaying 2. The moving amount calculating means specifies data of a plurality of data including plot points of data moved by the moving means, and a plurality of data specified by the data specifying means. It is composed of end-point designating means for obtaining start-point and end-point data, and data interpolating means for interpolating between the start-point and end-point data designated by the end-point designating means and the data moved by the moving means. The data correction device according to claim 1, wherein: