JPS63272449A - Automatic adjustment for copying tracer head sensitivity - Google Patents

Abstract

PURPOSE:To avoid the need of adjusting an amplifier by inputting the output value of a tracer head due to the constant shift quantity of a contactor for each stylus having different length into an NC and memorizing the ratio in each direction and calculating the shift quantity in the ordinary use. CONSTITUTION:An NC drive copying main spindle head 11 is shifted in the Y-axis direction, and the contactor of a stylus 18A contacts an adjusted square cylinder 16, and a core is shifted in the Y-axis direction further by a certain quantity from a touch point, e.g., by 1 mm through a tracer shaft 17 by the NC instruction, and the shift direction is memorized in an NC, and the displacement delta0 of the stylus 18A reaches 1 mm, and the output voltage alpha0 of a sensor coil is input into the NC. The constant K corresponding to the stylus No. and shift direction is memorized as 1/alpha0 into the NC. Similarly, the constant in the X-axis direction is memorized in the NC. Since the shift quantity of the contactor is calculated according to the constant K, the output value of a tracer head which varies at each replacement of a plurality of styli having different length can be set to an equal sensitivity automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for automatically adjusting the sensitivity of a tracer head of a copying machine.

In conventional copying machines, the stylus that is removably attached to the tracer head is normally used with several different lengths depending on the shape of the tool or interference with the model. Figure 4 shows that the length of the stylus is different (
b) When the displacement amount of the tip of the stylus 51 is fixed to, for example, one dragon as shown in (b), the displacement amount Z, , X2 of the core 53 inserted into the center hole of the coil 52 of the differential transformer is the length of the stylus 51. Coil 5 varies depending on Ll and L2.
2's output voltage fluctuates. This output voltage is sent to the control device via the amplifier 54, so manual operation is performed to change the sensitivity of the amplifier by turning the sensitivity adjustment knob 54a of the amplifier so that the same output signal is obtained for the amount of displacement of the stylus. .

Problems to be Solved by the Invention Manual adjustment of pest control must be performed in each movement direction of the X-axis and Y-axis every time the length of the stylus changes, which is not only very inefficient, but also requires automatic stylus adjustment. This had become a bottleneck for automated driving using replacement devices.

Means for Solving Problems Grip the tool T on the tool spindle I3, attach the workpiece to the table 2, make the styli 18A, 18B removably fixed to the tracer head 15 follow the model, '8B displacement of the tracer head 1
5, and the output value of the tracer head 15 determines N.
In a copying machine in which a G-controlled copying device controls the relative movement of the tool spindle 13 and the table 2, the contacts 18a of a plurality of styluses 18A, 18B of different lengths are kept constant in both the X-axis direction and the Y-axis direction. Displacement amount δ.

Each output value α of the tracer head 15 is calculated according to the following.

is input into the NC or computer in advance to obtain the constant displacement amount δ. and the output value α. From Squillus 18A, 18
Each constant K is calculated for each length of B and the direction of displacement of the contactor 18a and is recorded in advance tα, and the output value αj of the tracer head 15 during normal use and the stylus 18A used at this time.

The displacement amount αi of the contact 18a of the stylus is calculated using the constant K corresponding to the length and displacement direction of the stylus 18B.

Example Embodiments of the present invention will be described below based on the drawings.

In a portal copying machine like the one shown in Figure 1, the front and back (X-axis)
A work table 2 is placed on a head 1 having a sliding guide surface in the direction so as to be movable and positionable, and a model bed 3 is installed on the floor to the left of the head 1 in parallel with the bed 1.

A sliding guide surface in the X-axis direction parallel to the sliding guide surface of the head 1 is cut on the upper surface of the model head 3, and a model table 4 is placed thereon so as to be movable and positionable. The work table 2 and model table 4 can be moved relative to each other in the X-axis direction by NC control. Columns 5 having sliding guide surfaces in the vertical (Z-axis) direction are erected on both sides of the head 1, and the upper end surfaces of the columns 5 are connected by a top beam 6, forming a gate-shaped structure.

A cross rail 7 having sliding guide surfaces 7a in the left-right (Y-axis) direction is placed on the Z-axis sliding guide surfaces of both columns 5 so that the position can be adjusted, and the tool spindle head 8 moves on the sliding guide surfaces 7a. It is placed so that it can be positioned. A top beam 10 having a sliding guide surface 10a in the Y-axis direction is fixed on columns 9 erected on both sides of the model head 3, and the spindle head 11 is moved and positioned by following the sliding guide surface 10a of the top beam 10. Possibly placed. Then, the tool spindle head 8 and the copying spindle head 1
1 are both relatively movable by a control device.

A tool spindle sleeve 12 is provided on the tool spindle head 8 so as to be movable and positionable in the X-axis direction, a tool spindle 13 is rotatably supported on the tool spindle sleeve 2 by a plurality of bearings, and a tool T is removably attached to the tip. There is. A copying spindle 14 is provided on the copying spindle head 11 so as to be movable and positionable in the X-axis direction, and a tracer head 15 is attached to the lower end of the copying spindle 14. Then, the tool spindle sleeve 12 and the copying spindle 1
4 is capable of relative movement under NC control. A rectangular cylinder 16 for adjustment is placed on the model table 4 with its two parallel surfaces facing the X-axis and Y-axis, respectively, and the copying main axis 1
A tracer head 15 is vertically attached to the tip of 4. The tracer head 15 is, for example, disclosed in Japanese Patent Application Laid-Open No. 54-432.
No. 31 can be used. This thing has an X axis and a Y axis.

1-Sensor coils for each of the three directions, each having a laser shaft 17 and having cores for each of the three directions fixed to the tracer shaft 17 and fixed in the tracer head body; movable in three directions of the Z axis; The coil output is proportional to the amount of displacement of the tracer shaft 17. The tracer head 15 is manufactured by Japanese Patent Application Laid-Open No. 54-4323.
Of course, there is no need to limit it to No. 1.
It is also possible to use other sensor coils as long as outputs proportional to the amount of displacement of the tracer shaft 17 can be obtained from the respective sensor coils for the two directions in the Y-axis direction. A stylus is removably fixed to the lower end of the tracer shaft 17 with the spherical contact 18a facing downward. A plurality of styluses having different lengths, such as a stylus 18A with a short shank and a stylus 18B with a long shank, are fixed as necessary by a manual or automatic stylus exchange device.

Several types of styluses 1 with different lengths are prepared in the tracer head 15 in order to correspond to various types of machining of the working portal copying machine.
8A, 18B, etc. are installed in order to adjust the sensor coil output to the same amount for the stylus displacement amount, which varies depending on the length of the stylus. This will be explained using a flowchart.

A short stylus 18A is attached to the tracer head 15, and a stylus identification number is sent to the NC in step Sl.
A stylus displacement direction automatic detection command is input. In step S2, the NC-driven copying spindle head 11 is moved to the right in the Y-axis direction in FIG. The core moves within the Y motion sensor coil, and the sensor coil outputs the displacement as a voltage change based on the principle of a differential transformer.

From the point at which this output voltage change starts, that is, from the touch point, the stylus 18A moves further to the right in the Y-axis direction by a certain amount, for example, by a G command, and the displacement direction is automatically stored in the NC.
displacement δ. becomes 1 mm.

In step S3, the output voltage α of the sensor coil at this time. For example, if V is 0.9V, 0.9V is input to the NC. In step S4, 17α0, that is, 110
．． 9 is calculated and stored in NG as a constant corresponding to the stylus identification number and displacement direction, and the initial cent of rightward movement in the Y-axis direction is completed.

Initial cent movement to the left in the Y-axis direction is subsequently performed in the same manner. Subsequently, the same procedure is performed for displacement in the X-axis direction, but α in this case. , α, is the output from the X-axis sensor coil. Next, the long stylus 18B is attached to the tracer head 15, and the above-described initial cent procedure steps 81 to S4 are repeated for each stylus displacement direction, and in step S3, the output of the Y-axis circumferential sensor coil is set to, for example, 0.8V. For example, I10.8 is calculated in step S4 and stored in the NC as a constant corresponding to the stylus identification number input in step Sl and the displacement direction automatically detected in step S2.

The procedure for normally using a stylus in which each constant K is stored in advance in the NC before processing is such that when a model (not shown) is fixed on the model table 4 and the short stylus 18A is first attached, in step S5 The stylus identification number is input and in step S6,
The stylus 18A moves to the right in the Y-axis direction and the contact 18
When the stylus a contacts the model and is displaced, the stylus displacement direction at this time is automatically determined by calculation, and if the output power αi of the Y-axis circumferential sensor coil in this stylus displacement direction is, for example, 0.45V, then this 0.45V is It is input as NG. In step S7, among the constants stored in NG, a constant K corresponding to the stylus identification number and displacement direction is read out from the memory, and an operation of xαi is performed on the constant. The read constant is 110.9, so 110.9
X O,, +5 = 0.5, that is, the displacement δi of the stylus 18A is calculated to be 0.511 m.

In step S8, the displacement amount δi 0.5 of the stylus 18A is displayed on the NC device along with the stylus identification number and the displacement direction. Corresponding to this displacement amount δi, NC
By copying control, the tool T of this machine is moved to the right in the Y-axis direction and copying processing is performed.

When the stylus 18B is replaced with a longer stylus, the stylus identification number is input in step S5, and the stylus displacement direction is automatically determined by the NC in step S6. 0°4v is input to the NC as αi corresponding to the displacement direction at this time. Step S7
A constant K corresponding to the stylus identification number and displacement direction is recalled from memory at 110.8.
So 110.8 x 0.4. = 0.5. δi is calculated as 0.5++++. In step S8, N
Displacement amount δi of stylus 18B to C device 0.5 tm
is displayed together with the stylus identification number and displacement direction, and copying is performed by moving the tool T of this machine corresponding to this displacement amount δl.

Further, when the contact 18a of the stylus is displaced to the left in the Y-axis direction, the direction of displacement of the stylus is automatically determined in step S6, and the constant K corresponding to this displacement direction is read out from the memory in step S7, and the amount of displacement of the stylus is determined. δ1 is calculated. δi is similarly calculated for the displacement in the X-axis direction. X axis during actual copying machining.

The Y-axis composite displacement is supported by the contact 18a, and the displacement corresponding to each direction component is expressed as the sensor coil output αi and the constant K.
Calculated from , the tool T of this machine is moved in the composite direction.

Effects As detailed above, the present invention allows a stylus that is removably fixed to a tracer head to follow a model, detects this stylus displacement with the tracer head, and uses this output value to control the NC-controlled copying device to adjust the tool spindle and workpiece. In a copying machine that controls relative movement with a table attached to
The respective output values of the tracer head when the contacts of multiple styli of different lengths are displaced by a certain amount in both directions of the X-axis and both directions of the Y-axis are input into an NC or computer, and this input and the constant value of the contacts are input into the NC or computer. Each constant is calculated and stored in advance according to the amount of movement, and the amount of displacement of the stylus contact is calculated using the output value of the tracer head during normal use, the stylus length used at this time, and the constant corresponding to the displacement axis direction. This makes it possible to automatically set the output value of the tracer head, which changes every time you replace multiple styli of different lengths, to the same sensitivity using an NC or computer, eliminating the need for complicated amplifier sensitivity adjustments. This has the effect of making fully automatic operation possible by using an automatic stylus exchange device.

[Brief explanation of the drawing]

Figure 1 is an enlarged view of the bag gap of the copying machine, Figure 2 is an enlarged view of the tip of the tracer shaft and stylus, Figure 3 is a flowchart showing the adjustment procedure, and Figures 4 (a) and (b) are explanatory diagrams of the conventional technology. It is. 13...Tool spindle 15...Tracer head 14...
Copying spindle

Claims (1)

[Claims] (1) A stylus removably fixed to a tracer head is made to follow the model, the displacement of the stylus is detected by the tracer head, and the NC-controlled copying device detects the relative movement of the tool spindle and table based on the output value of the tracer head. In the copying machine to be controlled, each output value of the tracer head is input in advance into the NC or computer based on a constant displacement amount of a plurality of stylus contacts of different lengths in both directions of the X axis and both directions of the Y axis. From the constant displacement amount and the output value, calculate constants for each stylus length and contact displacement direction and store them in advance, and calculate the output value of the tracer head during normal use and the stylus used at this time. A method for automatically adjusting the sensitivity of a scanning tracer head, characterized in that the amount of displacement of the contact of the stylus is automatically calculated using the constants corresponding to the length and the direction of displacement.