JPS5927314B2 - Tracing control method - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a copying control system, and in particular, it is possible to automatically change the clamp level by a predetermined amount for each machining process, and perform continuous clamp copying machining from rough machining to finishing machining. This is related to a tracing control method that can be used.

For clamp copying machining using the conventional copying control method, for example, as shown in Fig. 1, a limit switch LS is installed at the depth D position (hereinafter referred to as the clamp level) where the model MDL to which clamp copying is applied is located. When this limit switch LS is turned on due to movement of the stylus, the feeding of the model MDL in the depth direction is stopped, the stylus is moved horizontally without contacting the model, and the stylus is moved again from the position where it contacts the model MDL again. This is to start copying, and when machining is completed, limit switch L is activated.
For example, by changing the position of S by a predetermined depth of cut ΔD,
Set it to the S' position and perform ramp copying as before.
By repeating this process, the shape of the model MDL is finally copied to the bottom, and the machining is completed.

In this way, the conventional method requires a limit switch, which is relatively unreliable due to its mechanical operation, and also requires changing the position of the limit switch for each machining process, which makes it difficult to operate from rough machining to rough machining. It is difficult to perform continuous machining up to finish machining, and the machining time is long.

The present invention is an attempt to improve these conventional drawbacks.The purpose of the present invention is to input and store data regarding the clamp level in advance, and to control the clamp feed operating point using that data, from rough machining to finishing. The purpose is to shorten the machining time by making it possible to perform copy machining continuously up to machining.

Examples will be described in detail below.

FIG. 2 is a block diagram of an embodiment of the present invention, in which DG,
IND is the displacement signal εX, ε of the output of the tracer head TR
Displacement synthesis circuit and indexing circuit that receive Y and εZ, AR
N, ART is a speed calculation circuit, ADD is an addition circuit, DC is a distribution circuit, OOMP is a comparison circuit, GO is a gate circuit, D
RVX, DRVY, DRVZ are amplification output circuits, MX, M
Y, MZ are servo motors, POX, POY, POZ are position detectors, MDL is a model, ST is a stylus, OT is a cutter, W is a workpiece, MAC is a copying machine, 0NTX
,0NTY.

A reversible counter that counts pulses from the ONT'ZAt position detector to indicate the current position, OLP is a clamp feed command generation circuit, OPP is an operation panel, R8 is a setting dial for speed etc., BT' j BT2 is a push button, KB is a A keyboard, DSP is a display section, DI is a data input device, MEM is a memory consisting of a data memory section M1 and a control program section M3, DO is a data output device, CPU is a processor, DA'' and DA are a DA converter.

The stylus ST comes into contact with the model MDL and is fed by the servo motor, and from the displacement signals εX, εY, ε2 corresponding to the displacement of the stylus ST, the displacement synthesis circuit DG generates -63<+67+6M (7) Synthesis displacement signal ε
The indexing circuit IND outputs a displacement direction signal sinθ,
Output cosθ.

The composite displacement signal ε is added to an adder circuit ADD to produce a reference displacement signal ε.

The difference Δε between the
T is obtained, and in the distribution circuit DC, the displacement direction signal si
A command speed signal is created based on nθ and cosθ and is applied to the gate circuit GO.

A command speed signal is applied to the amplification output circuit selected by the gate circuit GC, and the servo motor is driven in accordance with the command speed signal to drive the cutter OT and tracer head TR.
An integrated delivery is carried out.

Since the above-mentioned operation is already known, detailed explanation will be omitted.

In this embodiment, copying operation data including data regarding the clamp level is input from the keyboard KB, etc., and the memory M
The memory MEM is stored in the memory MEM according to the copying operation.
This system reads data from the machine and controls the copying path including the clamp level according to that data, eliminating the need for limit switches in conventional models and automatically changing the clamp level for each machining process based on the stored clamp level data. This allows continuous processing from rough machining to finishing machining, and the input data shown in the following table can be used, for example.

As shown in Fig. 3, the approach from starting point A is toward point a, copying turning position LP=XILN=X, big feed amount P, copying end position LTE-¥1, automatic return position LRP=Z' , clamp level initial position 0PL=
CO” and input data such as speed and direction, a.
Copying is performed on the path of b, c...utV, and clamp copying is performed in the section a=b, c"d...t"u, and the copying end position ¥1 When returning to position Z1 by automatic return, control is performed according to the flowchart shown in FIG.

By pressing the approach button (not shown), the processor CPU reads data on the approach axis, approach direction, and approach speed from the memo IJMEM, gives a signal to the gate circuit GO via the data output device DO, and outputs the amplification output circuit. The DRVI is operated and the tracer head TR and cutter CT are lowered by the servo motor MZ.

The speed at that time can be determined by data given to the DA converter DA2 via the data output device DO.

Since the displacement signals εX, εY, and ε2 are zero until the stylus ST contacts the model MDL, the difference signal Δε is the reference displacement signal ε.

It becomes. Stylus ST contacts model MDL and ε-ε.

Then, the comparator circuit detects that Δε=0 and applies an approach end signal AE to the data input device DI.

When the processor CPU reads this approach end signal AE and identifies the completion of the approach, copy activation is performed.

With this copying start, the processor CPU reads data on the mode, reference displacement amount, copying direction, and copying speed, and copying control is started.

The reference displacement amount data is converted into an analog reference displacement signal ε by the DA converter DA1.

The servo motor MX is driven in the direction according to the scanning direction data.

The processor CPU also reads the initial clamp level position cPLt from the memory MEM and compares it with the contents of a reversible counter CNTZ indicating the current position of the squirrel ST.

As a result of this comparison, if the addition content of the reversible counter ONT and the clamp level initial position CPL become equal, the processor C
The PU sends a start signal to the clamp feed command generation circuit via the data output device DO to activate it by interrupt operation, and also switches the gate circuit GO to output the clamp feed command generated by the clamp feed command generation circuit OLP. A signal is input to a predetermined servo motor.

With this operation, the stylus ST is fed in the horizontal direction without tracing, and clamp feeding is performed at a predetermined level position.

During clamp feeding, stylus ST displacement signals εX, εY
, ε2 are zero, so the difference signal Δε is the reference displacement signal ε.

However, when the stylus ST contacts the model MDL again, ε=60 and the difference signal Δε becomes zero.

When the comparison circuit 00MP detects that Δε=O,
The approach end signal AE is sent to the data input device DI, the processor CPU reads this approach end signal AE, and the stylus ST is moved to the model M by clamp feeding.
Identifies that the DL has been touched.

Then, the clamp command generation circuit OLP is stopped via the data output device DO, and the gate circuit GO is switched.
Clamp feeding is stopped and the above-mentioned copying operation is resumed.

In addition, the processor CPU reads the scanning return positions LP and LN from the memory MBM and compares them with the contents of a reversible counter CNTX (7) indicating the current position of the stylus ST.

For example, in one-direction copying, when the content of the reversible counter 0NTX and the copying turning position LN7 become equal, the axis is switched, the processor CPU reads the data of the pick feed direction, pick feed speed, and pick feed amount P, and picks Control the feed.

Then, when the content of the reversible counter 0NTY becomes equal to the pick feed amount P from the start of pick feed, the processor CPU causes the copying to be turned back, that is, to perform ten-direction scanning.

In addition, the processor CPU determines whether or not the copying end position has been reached, and if it is determined that the copying end position LTE has been reached during pick feeding, the processor CPU
The PU reads the automatic return, automatic return speed, and automatic return position LRP from the memo IJMEM, drives the servo motor MZ by turning on the automatic return, and turns the reversible counter ON-.
When reaching the extension force return position LRP, the copying control for machining is terminated.

In addition, if repeat copying has been set in advance by input from a keyboard, etc., the processor CPU, following the automatic return operation, returns the stylus ST to the approach starting point A using well-known positioning control, and performs the above-mentioned clamp copying again. Execute.

However, the clamp level in this case is the value OPL + ΔOPL, which is the sum of the above-mentioned clamp level initial position OPL and the clamp level change amount ΔOPL, which has been stored in the memory MBM in advance in consideration of the cutting ability of the tool, etc. This is used to perform clamp copying.

In this way, the clamp level can be automatically changed by a predetermined amount for each machining process, and clamp tracing can be performed repeatedly until the final clamp level position "PLE" is reached, so it is possible to perform continuous machining from rough machining to finishing machining. This greatly reduces machining time.

The above-mentioned copying turn-around positions LP, LN, copying end position LTE
, automatic return position LRP, pick feed amount P, clamp level initial position OPL, clamp level change amount ΔCP
It is also possible to replace the input from the keyboard KB by setting the contents of the reversible counter when moving to each position in the clamp level final position CPLE manual feed mode in the memory MEM.

Furthermore, even during the copying operation, the data in the memo IJMEM can be rewritten to correct the copying path including the clamp level.

For example, read the data of the memo IJMEM and display it on the display unit DSP.
The data is corrected and rewritten by operating the keyboard KB, and the position at which clamp feed starts, that is, the clamp level initial position OPL, the clamp level change amount ΔOPL, and the clamp level final position cp
, , s can be easily modified.

In the embodiments described above, all the data that defines the copying operation are stored in advance, and the copying route including the clamp feeding route is controlled using the data. It is not necessary to store all the data that defines this in the memory; for example, the position of scanning and turning back can be controlled using a conventional limit switch.

As explained above, the present invention stores data defining a copying operation including an initial clamp level position, an amount of change in the clamp level, and a final clamp level position in a memory, and -
For each machining, the amount of change in clamp level is added to the previously traced clamp level position to find the next clamp level position, and clamp trace machining is performed repeatedly, and automatic machining is performed continuously from rough machining to finishing machining. This has the advantage of significantly shortening processing time.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of conventional clamp profiling processing, Fig. 2 is a block diagram of an embodiment of the present invention, Fig. 3 is an explanatory diagram of an example of the profiling path, and Fig. 4 is a flowchart for explaining the operation. . TR is the tracer head, ST is the stylus, MDL is the model, CT is the cutter, W is the workpiece, MX, MY, MZ are the servo motors, POX, POY. POZ is position detector, 0NTX, 0NTY, C3NTZ
is a reversible counter, OPP is an operation panel, KB is a keyboard, DI is a data input device, DO is a data output device, M
BM is memory, CPU is processor, GC is gate circuit, DC is distribution circuit, ARN. ART is a speed calculation circuit, DG is a displacement synthesis circuit, IND is an indexing circuit, OOMP is a comparison circuit, and OLP is a clamp command generation circuit.

Claims (1)

[Claims] 1 In a method that performs scanning control by calculating the scanning direction and scanning speed using signals from a tracer head that tracks the model surface, the scanning operation including the initial clamp level position, amount of change in clamp level, and final clamp level position is specified. an input device for inputting data, a memory for storing the data, and a machine position detector for detecting the machine position;
a processor that reads and controls the detected position information of the machine position detector and the data stored in the memory;
From the initial clamp level position stored in the memory to the final clamp level position, the processor adds the clamp level change amount to the previously traced clamp level position for each machining process, thereby determining the next clamp level. A copying control method characterized by finding the position and performing repeated clamp copying machining.