JPS6125755A - Copy controller associated with position correcting function of tracer head - Google Patents

Abstract

PURPOSE:To perform copy machining reliably by moving the tracer head and the cutter relatively upon provision of correction command such as an automatic zero adjusting command thereby eliminating the relative positional shift. CONSTITUTION:Memory means 42 is storing a Z-axis displacement signal to be produced from a head 40 fixed with a stylus 41 having no relative positional shift against the cutter 43 when no force is applied onto the stylus 41. Upon provision of a correction command such as an automatic zero adjusting command, adding means 44 will produce the difference between the Z-axis displacement signal and the stored displacement signal to operate the corresponding displacement in operating means 45 while drive means 46 will drive at least one of first and second moving means 47, 48 thus to move the tracer head 40 and the cutter 43 relatively. Consequently, relative positional shift between the stylus and the cutter can be eliminated resulting in reliable copy machining.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tracing control device that is equipped with a tracer head position correction function that can automatically correct deviations in the relative positions of a stylus and a cutter.

BACKGROUND OF THE INVENTION Conventional profiling control devices have been proposed in which a stylus can be replaced. By the way, when replacing the stylus, if the weight of the stylus attached to the tracer head differs from the weight of the stylus being replaced, even if the force in the Z-axis (gravitational axis) direction applied to the stylus is zero, The signal output from the tracer head does not become zero, making it impossible to perform tracing control. Conventionally, in order to prevent this, when replacing the stylus, the force in the Z-axis direction applied to the stylus is set to zero, and the displacement signal ε in the Z-axis direction output from the tracer head at that time is stored in memory. After that, the displacement signal εa in the Z-axis direction output from the tracer head and the displacement signal εa stored in the memory will be used.
The difference ε work ゛ - ε knee ε work 〇 is imaged as a displacement signal in the Z-axis direction and processed. Incidentally, the above-mentioned operation is called automatic zero point adjustment.

By performing automatic zero point adjustment as described above, it is possible to perform pattern control even when using styluses of different weights, but simply performing automatic zero point adjustment has the following drawbacks. In other words, if a stylus with a different weight is attached, not only will the electrical zero point shift as described above, but the relative position of the stylus and cutter will also shift, making it impossible to process the workpiece into the same shape as the model. There were some drawbacks. For example, if the weight of the replaced stylus is heavier than the stylus that was attached to the tracer head, the position of the stylus tip may be lower (-) than the position of the cutter tip.
If the model M shown in Fig. 5 is followed, the movement path of the cutter CT will be as shown by the dotted line (A), and it is possible to machine the workpiece W into the same shape as the model M. When replacing the stylus, simply performing automatic zero point adjustment may cause the relative position of the stylus and cutter to shift, making it impossible to machine the workpiece into the same shape as the model. Although the stylus and cutter are aligned using means, there are disadvantages in that it is difficult to achieve accurate alignment and it places a burden on the operator.

Problems to be Solved by the Invention The present invention improves the above-mentioned drawbacks, and its purpose is to automatically correct the relative positional deviation between the stylus and cutter during automatic zero point adjustment, etc. It is in.

Means for Solving the Problems FIG. 1 is a block diagram of the present invention. Tracerheno 1” 4
0 outputs a displacement signal corresponding to the displacement of the stylus 41. The storage means 42 stores the i-laser head 4 when a stylus that is not misaligned relative to the cutter 43 is attached to the tracer head 40 and no force is applied to the stylus.
A displacement signal in the Z-axis direction output from 0 is stored. The addition means 44 outputs the difference between the displacement signal in the Z-axis direction output from the tracer head 40 and the displacement signal stored in the storage means 42 when a correction command such as an automatic zero point adjustment command is input, and calculates the difference between the displacement signal and the displacement signal stored in the storage means 42. 45 calculates a displacement amount corresponding to the addition result of the adding means 44. The driving means 46 is a first moving means 47 that moves the tracer head 40 in the Z-axis direction.
and a second moving means 4 for moving the cutter 43 in the Z-axis direction.
8 to relatively move the tracer head 40 and cutter 43 by a displacement amount corresponding to the calculation result of the calculation means 45.

Embodiment FIG. 2 is a block diagram of an embodiment of the present invention, in which 1 is a microprocessor, 2 is a memory, 3 is an output section, 4 is an input section, 5 is a tracer head, 6 is a stylus, 7 is a model, 8 is a motor that moves the tracer head 5 in the Z-axis direction, 9 is a cutter head, 10 is a cutter, 11 is a workpiece, 1
2 is a motor that moves the cutter head 9 in the Z-axis direction;
3.14 is the motor, 15-18 is the position detector, 19-2
1 is an OA converter, 22.23 is a gate circuit, 24 to 27
is a servo amplifier, Yoshi is an AD converter, 29 to 32 are reversible counters, and O is a keyboard. Further, FIG. 3 is a flowchart showing the processing contents of the microprocessor 1 during profile machining, and the operation shown in FIG. 2 during profile machining will be explained below with reference to FIG.

During the profiling process, the microprocessor 1 first applies a control signal to the output section 3, sets the output signals a and b to "1", and turns on the gate circuits 22 and 23 in step S1). The microprocessor l then transfers the data from the tracer head 5 to A
D converter 28, X, Y, Z applied via input section 3
Axial displacement signal ε.

ε1. ε2 is read (step S2), and then the difference ε1° between the Z-axis displacement signal ε2 and the displacement signal ε0 output from the tracer head 5 when no force is applied to the stylus 6 in the Z-axis direction is ε1° −ε, −ε 0 is calculated (step S3). Incidentally, the displacement signal ε 0 is stored in the memory 2 at the time of automatic zero point adjustment, as will be described later. Next, the microprocessor 1 determines the composite displacement signal ε=Ey"Ey"Ex" (step S4), and then determines the difference Δε-ε-ε between the composite displacement signal ε and the reference displacement signal ε (step S5).
), then the tangential velocity signal V and the normal velocity signal 8 are determined based on the difference Δε (step S6), and then the displacement direction signals cos θ and sin θ are determined (step S7). The microprocessor l then outputs a tangential velocity signal V, a normal velocity signal VN and a displacement direction signal c.
A command speed signal is determined based on osθ and sInθ and is output (step S8). In addition, the profiling plane is
If it is a Z plane, the command speed signal Vx in the X-axis direction is applied to the motor 13 via the D^ converter 21 and the servo amplifier 27, and the command speed signal Vzl) in the X-axis direction <D^ converter 19
, gate circuits 22, 23, and servo amplifiers 24, 25 to the motors 8, 12, and integrally feed the tracer head 5 and cutter 9.

Then, when it is determined that a certain period of time T has passed after the processing in step S8 is completed (step S9), the microprocessor 1 determines whether or not the machining has been completed.
IO), if the judgment result is YES, end the process,
If the determination result is NO, the process returns to step S2. Incidentally, since the above-mentioned operation is already known as profile control, further detailed explanation will be omitted.

FIG. 4 is a flowchart 1 showing the processing content of the microprocessor 1 when exchanging a stylus, and the operation shown in FIG. 2 when exchanging a stylus will be explained below with reference to the same figure.

When replacing the stylus, the operator prevents any force from being applied to the stylus in the X-axis direction, and then inputs an automatic zero point adjustment command from the keyboard 33. However, the lengths of the styli are assumed to be equal in the following description.

When an automatic zero point adjustment command is input from the keyboard 33,
The microprocessor 1 starts the program shown in FIG. 4, and first receives a displacement signal ε! in the X-axis direction applied from the tracer head 5 via the AD converter 28 and the input section 4. 0 (step 5ll), and then the microprocessor 1 stores the displacement signal ∈ 0 read in step S1 in the memory 2.
(step 5t2), and then
The microprocessor 1 performs the calculation shown in the following equation (1) (step 513).

Δε knee ε engineering. −E−+ −−(1) However, f: engineering 1
is a displacement signal in the X-axis direction output from the tracer head 5 when a stylus with no force or positional deviation with respect to the ivy 10 is attached to the tracer head 5, and no force is applied to the stylus in the X-axis direction. It is stored in a predetermined area in advance.

Next, the macroprocessor 1 determines the displacement amount l corresponding to the difference Δε2 determined in step S13 (step knob 514). In addition, the difference Δε work and displacement amount! Since this is a one-to-one ratio, the amount of displacement p can be obtained by performing the calculation shown in the following equation (2).

β-K・Δεd (2) However, K (>O) is a proportionality constant.

Next, the microprocessor l applies a control signal to the output section 3 to set the output signals a and b to "0" and "1" respectively (step 515), turning the gate circuits 22 and 23 on and off, respectively. , it is determined whether the displacement amount p obtained in step S14 is 0 or not.Step 816
) If the judgment result is YES, the process ends; if the judgment result is NO, the displacement β obtained in Sukenobu S] 5 is 1.
Determine whether the relationship >0 is satisfied (Sukenobu 517
).

7. If the determination result in step S17 is YES, the microprocessor 1 adds the tracer head 5 to the tracer head 19, the gate circuit 23, and the tracer 8 via the gate circuit 23 and the No. 10 amplifier 25, 5 moves in the -Z axis direction. Then, when it is determined that the router node 5 has moved by the displacement II' ft determined in step SI4 (step 519), the microprocessor 1 ends the process. Further, if the determination result in step S17 is NO,
A speed signal for moving the tracer head 5 in the +ZZ axis direction is applied to the DA converter 19 (step 520). This speed signal is transmitted by the DA converter】9, gate circuit, servo amplifier 5
The tracer head 5 is applied to the motor 8 via +Z
Moved in the Z-axis direction. When the microprocessor 1 determines that the tracer head 5 has moved by the amount of displacement l determined in step S14, that is, that the positional deviation between the stylus 6 and the cutter 10 has been corrected (step 521), the microprocessor 1 ends the process. Note that whether or not the tracer head 5 has moved by the displacement amount p is determined based on the count value of the reversible counter 32 indicating the current position of the tracer head 5.

In the above embodiment, the tracer head 5 is moved in the Z-axis direction during automatic zero point adjustment, but it is of course possible to move the cutter 10 in the Z-axis direction. It goes without saying that both the tracer head 5 and the cutter O may be moved.

As described in detail, the present invention moves the tracer head 1 and the cutter relatively when a correction command such as an automatic zero point adjustment command is input, thereby eliminating relative positional deviation between the stylus and the cutter. Therefore, there is an advantage that pattern processing can be carried out reliably, and there is also an advantage that the burden on the operator can be reduced.

[Brief explanation of the drawing]

Figure 1 is a block diagram of the present invention, Figure 2 is a block diagram of an embodiment of the present invention, Figures 3 and 4 are flowcharts showing the processing contents of the micro 10 setter l, and Figure 5 is a diagram of the conventional example. FIG. 3 is a diagram showing the locus of a cutter to explain a defect. 1 is a microprocessor, 2 is a memory, 3 is an output section, 4
is the input section, 5.40 is the tracer head, 6゜41, ST
is a stylus, 7. M is the model, 8 is the tracer head 5
9 is a cutter head; 1 is a motor that moves the motor in the Z-axis direction;
0.50. CT is a cutter, 11. W is work, 12
13 is a motor that moves the cutter head 9 in the Z-axis direction;
．． 14 is a motor, 15 to 18 are position detectors, 19 to 21
is a D^ converter, 22.23 is a gate circuit, 24 to 27 are servo amplifiers, 28 is an AD converter, 29 to 32 are reversible counters, 33 is a keyboard, 42 is a storage means, 44 is an addition means, and 45 is an arithmetic operation means, 46 is a driving means, 47 is a first
48 is a second moving means. Patent applicant Fanasoku Co., Ltd. Patent attorney Gobe Tamamushi (2 others) Figure 1 "1 -3F13- Figure 5

Claims (1)

[Claims] Tracing control that includes a first moving means that moves a tracer head in the Z-axis direction that outputs a displacement signal corresponding to the displacement of the stylus, and a second moving means that moves a cutter that cuts the workpiece in the Z-axis direction. In the device, when a stylus with no relative positional deviation with respect to the cutter is attached to the tracer head and no force is applied to the stylus in the Z-axis direction, a displacement signal in the Z-axis direction is output from the tracer head. storage means for storing, addition means for outputting a difference between a displacement signal output from the tracer head when a correction command is input and a displacement signal stored in the storage means, and an addition result of the addition means. and a calculation means for calculating a displacement amount corresponding to A tracing control device equipped with a tracer head position correction function, characterized in that it is equipped with a drive means for moving the tracer head in a specific manner.