JPH0579460B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a profiling control device for performing profiling in a machine tool, and particularly to a profiling control device that automatically performs multi-step profiling without operator intervention. (Prior art) A tracing device uses a tracer head to trace a model, uses the positional displacement detected by the tracer head to calculate a speed command for each axis in a tracing calculation circuit, and then responds to the speed command for each axis. The tool is moved relative to the workpiece by driving the motor of each axis, and the tracer head is used to align the model surface, and these operations are repeated to machine the workpiece into the same shape as the model. . (Problems to be Solved by the Invention) In order to perform profiling processing using the above profiling control device, the profiling speed, reference displacement amount, profiling direction,
It is necessary to input profiling machining condition data for specifying machining conditions such as the pick feed amount and its direction, and profiling area data for specifying the profiling area.
For this reason, conventionally one process of tracing was performed on one model using one set of tracing machining condition data and tracing area data, but in order to perform tracing of multiple tracing areas on the same model, one step was required. Each time the machining of a tracing area is completed, these tracing machining condition data and tracing area data are reset from an operation panel or the like, and another process is performed. For example, when the shape of a model becomes complex and it is necessary to perform multiple profiling processes on one model with different machining conditions depending on each area, conventional profiling control devices can handle these processes in separate processes. Because of this, the operator intervenes after each step and resets the data before tracing the next step, which results in frequent operations, increasing the operator's effort, and requiring continuous automatic tracing. The drawback was that I couldn't do it. In addition, when operating a copying machine tool in automatic operation, it is possible to continuously automatically operate a copying machine tool consisting of multiple profiling processes, as in the invention of an operation panel for a copying machine tool disclosed in JP-A No. 55-54158. When performing contouring, it has also been considered to make it easier for the operator to set conditions for contouring control from an operation panel. However, when creating a copy program,
It is necessary to set the program data from the operation panel for each block, and when machining a large number of workpieces for the same model repeatedly, it only reduces the burden on the operator and makes it easier to perform another tracing machining. In this case, the data must be reset. SUMMARY OF THE INVENTION An object of the present invention is to provide a multi-step profiling control device that can continuously process a workpiece corresponding to one model in a plurality of profiling areas. (Means for solving the problems) In order to achieve the objects of the present invention as described above,
The present invention calculates a speed command for each axis using the amount of displacement detected by the tracer head, and uses the speed command to drive a motor provided on each axis to move the tool relative to the workpiece. , in a multi-step profiling control device that uses a tracer head to align a model, means for setting a plurality of profiling areas for one model; means for setting processing conditions for each of the set profiling areas; A memory that stores the respective profiling areas set by the above two means and the machining conditions corresponding thereto, and a memory for reading out the stored machining condition data and the machining area data of the predetermined profiling from the memory and performing the profiling machining operation. An object of the present invention is to provide a multi-step profiling control device characterized by comprising a control means for controlling the profiling. (Operation) According to the multi-step profiling control device of the present invention, data necessary for executing a profiling command is arbitrarily specified from the memory and a program for performing multi-step profiling control is executed. There is no need to reset the data from the operation panel every time you trace. (Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram of a profiling machine tool operated using the multi-step profiling control device of the present invention.
X-axis motor XM that drives table TBL in the X-axis direction, tracer head TC and cutter head
A Z-axis motor ZM that drives the column CLM on which the CT is attached in the Z-axis direction and a Y-axis motor YM that moves the table TBL in the Y-axis direction are provided. A model MDL and a workpiece WK are fixed to the table TBL, the tracer head TC is in contact with the surface of the model MDL, and the cutter head CT is attached to the workpiece.
Process the WK according to the model shape. As is well known, the tracer head TC is
It is configured to detect displacements ε _x , ε _y , ε _z in each of the Y and Z axes, and each axial displacement detected by the tracer head TC is input to the profile control device TCC.
Here, a well-known tracing calculation is performed to generate velocity components in each axis direction. For example, if we consider surface tracing in the X-Z plane as a tracing method, the velocity component
V _x and V _z are generated, and these are respectively connected to the servo circuit.
X-axis and Z-axis motor MX via SVX, SVZ,
It is applied to MZ and rotates the motors MX and MZ of each axis. As a result, the cutter head CT moves relative to the workpiece WK, and the workpiece is machined according to the model shape.
TC will follow the surface of model MDL.
Note that SVY is a Y-axis servo circuit. FIG. 3 is a block diagram of an embodiment of the profiling control device according to the present invention. In the figure, 1 is a processor, which performs arithmetic processing to form instructions to the machine tool according to a profiling program stored in a program memory (RAM), which will be described later, and 2 is a control memory, which stores control programs. 3 is a data memory in which a plurality of machining condition data P ₁₁ , P ₁₂ , . . . and a plurality of tracing area data L ₁₁ , L ₁₂ , . . . are set by a setting board (not shown). A program memory 4 stores a program for performing multi-step profiling control, and stores a profiling program for specifying a profiling method, profiling conditions used therefor, and profiling area in the order of steps. In addition, the tracing methods include pencil tracing, manual tracing, surface reciprocating tracing, surface unidirectional tracing,
There are contour tracing, contour tracing, and three-dimensional tracing. Next, to explain the operation shown in Fig. 3, when the model is placed on the table prior to profiling, the operator enters multiple profiling conditions in accordance with each profiling method from the setting board (not shown) into the data memory 3. Input the data and tracing area data. For example, P11 to P15 for manual tracing
Set the 5 types of machining condition data up to and the 5 types of tracing area data from L11 to L15, and similarly set P21~P25, L21~L25 for surface reciprocating tracing.
, for surface unidirectional tracing P31~P35,L31
~35, P41~P45 for tracing the entire contour,
L41~L45, P51~ for contour tracing
P55, L51~55, P61~ for 3D tracing
Set P65 and L61 to L65 respectively. By the above operations, the tracing machining condition data P11 to P65 and the tracing area data L11 to L65 are set in the data memory 3. Then, when activated by the operator, the processor 1 reads out the profiling program stored in advance in the program memory 4 one block at a time and performs multi-step profiling control. Note that this tracing machining program is configured as follows, for example. G901 Z-0 P31 L32; …(A) G903 P34 L34; …(B) G00 X… Y; …(C) G901 Z… P… L…; …(D) G904 P43 L45; …(E) ...... However, in the program, (a) is an approach command block, G function command G901 means an approach command, and Z-0 indicates the approach point in the Z-axis direction (my mass symbol indicates the movement direction), P31,
L31 indicates the area in which the feed rate for each approach is set. Also, (b) is a command block that specifies the tracing method, tracing condition data, and tracing area data in the first tracing process, G903 instructs surface unidirectional tracing, and P31 and L32 specify the tracing condition data, Each piece of profiling area data is specified. (c) In order to carry out the second step of profiling,
This command positions the tracer head in rapid traverse directly above the approach point of the process. (d) is the approach command to the second process, (e) is a block that specifies the tracing method, tracing machining condition data, and tracing area data in the second tracing process, and G904 instructs to trace the entire contour. . Here, a specific example of data settings is as follows. For example, P34 is the fourth parameter area of P3 (one-way surface tracing mode), L45 is the fifth limit area of L4 (full contour tracing mode), and these are selected by operating the MDI screen. For example, if you want to input P34 data, use MDI
The following screen will be displayed on the CRT screen by operation.

[Table] Each item can be selected with the cursor by key operation, and the value can be set by inputting data interactively from the keyboard for the item selected by the cursor. Now, processor 1 reads the approach command (a) from memory, and then reads it from data memory 3.
Tracing machining condition data specified by P31,
Read the tracing area data specified by L32. Thereafter, using the speed included in the machining condition data, the tracer head is moved in the -Z axis direction and positioned at the approach point. Upon completion of positioning to the approach point, the processor reads (b) the command block for surface unidirectional tracing from the memory 5, and also reads the tracing machining condition data and tracing area data specified by P34 and P34 from the data memory 3. Then, using these data, one-way tracing processing is performed to determine the feed rate V _x ,
_Vz is generated, and the table TBL is driven by the X-axis motor XM, and the column CLM is driven by the Z-axis motor ZM. As a result, the tracer head TC operates according to the model MDL (see Figure 2).
Displacements ε _x , ε _y , and ε _z are output from the tracer head TC and input to the processor 1 . Processor 1 executes a well-known tracing operation based on the displacement to determine the feed rate.
Calculate V _x and V _z . For example, the feed rate V _x is |ε−
Control is performed so that it is inversely proportional to the value of ε ₀ | (where ε is the resultant displacement amount, and ε ₀ is the reference deviation), and the feed rate V _z is |
Displaced in proportion to the value of ε−ε ₀ |, and (ε−ε ₀ )
control so that it becomes zero. Therefore, the X-axis and Z-axis motors XM and ZM are driven via the servo circuits SVX and SVZ to drive the cutter head.
Workpiece WK is processed by CT. In this way,
A model of the tracer head TC is created by sequentially performing tracing calculations based on the displacement from the tracer head TC.
A speed command is calculated based on the displacement detected by the MDL, the motor of each axis is driven, the cutter head CT is moved relative to the workpiece WK, and the model is attached to the workpiece WK.
Process the same shape as the MDL shape. When the surface unidirectional tracing in (b) is completed, the processor reads the fast-forward command data shown in (c) from the program memory 4, and positions at the commanded position by simultaneous two-axis fast-forwarding in X and Y. The position commanded by this block is directly above the approach point of the second machining process. Thereafter, the command data (D), (E), . . . are read in sequence, and multi-step tracing is performed by positioning to the approach point, tracing control all around the contour, . . . in the same way as in the first machining process. Incidentally, instead of storing the command data and the processing program in the data memory 3, the command data and the processing program may be stored in an external storage medium such as a paper tape, and the processor 1 may sequentially read and execute them. (Effects of the Invention) As explained above, according to the present invention, it is possible to achieve continuous profiling processing for a plurality of profiling areas while reducing operator intervention. When performing profiling control for a plurality of profiling areas on a workpiece, the effect of reducing the burden on the operator is extremely large, and contributes to the automation of profiling processing for models with complex shapes. Although the present invention has been described by way of one embodiment, various modifications can be made within the scope of the gist of the present invention.
These are not excluded from the scope of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a profiling machine tool to which the present invention is applied, FIG. 2 is an explanatory diagram of the operation according to the present invention, and FIG. 3 is a block diagram of essential parts of an embodiment of the present invention. In the figure, TCC...Tracing control device, TC...Tracer head, CT...Cut head, MDL...Model, WK...Work, XM, YM, ZM...Motor, 1...Processor, 3...Data memory .

Claims (1)

[Claims] 1 A speed command for each axis is calculated using the amount of displacement detected by the tracer head, and the motor provided on each axis is driven by the speed command to move the tool relative to the workpiece, and the tracer head In a multi-step profiling control device that contours a model by a memory for storing each tracing area set by the means and machining conditions corresponding thereto, and a control for reading out the stored machining condition data and tracing area data of the predetermined tracing from the memory and controlling the tracing operation. 1. A multi-step tracing control device, comprising: means.