JPH074740B2 - Copy tray-automatic adjustment method of sensitivity - Google Patents

Description

The present invention relates to a method for automatically adjusting the sensitivity of a tracer head of a copying machine.

2. Description of the Related Art In a copying machine, a stylus detachably attached to a tracer head is usually a stylus having different lengths depending on the shape of a tool or interference with a model. When the stylus length is different, the displacement of the core 53 inserted into the center hole of the coil 52 of the differential transformer when the displacement of the stylus 51 tip is fixed to, for example, 1 mm as shown in Fig. 4 (a) and (b). the amount l _1, l ₂ varies depending lengths L _1, L ₂ of the stylus 51, the output voltage of the coil 52 is varied. Since this output voltage is sent to the control device through the amplifier 54, the sensitivity adjustment knob 54a of the amplifier is turned to change the sensitivity of the amplifier and the manual operation is performed so that the same output signal can be obtained for the stylus displacement amount. .

Problems to be Solved by the Invention Sensitivity adjustment by manual operation must be performed for each movement direction in the X-axis direction and the Y-axis direction each time the length of the stylus is different, which is very inefficient and also the automatic stylus. It was a bottleneck for automatic operation by the exchange device.

Means for Solving Problems The tool T is held on the tool spindle 14, the workpiece is attached to the table 2, and the stylus 18A, 18B detachably fixed to the tracer head 15 is made to follow the model, and the stylus 18A, 1
A displacement of 8B is detected by the tracer head 15, and an NC control copying device controls the relative movement of the tool spindle 13 and the table 2 based on the output value of the tracer head 15. Each output value α ₀ of the tracer head 15 according to a constant displacement amount δ ₀ of the contacts 18a of the stylus 18A, 18B in both the X-axis direction and the Y-axis direction.
Is input to the NC or computer in advance, and the constant K is calculated and stored in advance from the constant displacement amount δ ₀ and the output value α ₀ for each length of the stylus 18A, 18B and each displacement direction of the contact 18a. Aside from normal use, tracer head 15
The output amount αi of the stylus and the constant K corresponding to the length and the displacement direction of the stylus 18A, 18B used at this time are used to calculate the displacement amount αi of the contact 18a of the stylus.

Embodiments Embodiments of the present invention will be described below with reference to the drawings. In the portal copying machine as shown in FIG. 1, a work table 2 is movably mounted on a bed 1 having a slide guide surface in the front-back (X-axis) direction, and the work table 2 is placed on the left side of the bed on the bed. A model bed 3 is installed in parallel with 1. On the upper surface of the model bed 3, a sliding guide surface in the X-axis direction parallel to the sliding guide surface of the bed 1 is cut.
Are mounted so that they can be moved and positioned. The work table 2 and the model table 4 can be moved relative to each other in the X-axis direction by NC control. A column 5 having vertical (Z-axis) sliding guide surfaces is erected on both side surfaces of the bed 1, and the upper end surface of the column 5 has a gate-shaped structure connected by a top beam 6. A cross rail 7 having slide guide surfaces 7a in the left-right (Y-axis) direction is mounted on the Z-axis slide guide surfaces of both columns 5 so that the position can be adjusted, and the tool spindle head 8 is placed on the slide guide surfaces 7a.
Are mounted so that they can be moved and positioned. Model bed 3
Slide guide surfaces in the Y-axis direction on columns 9 that are erected on both sides of
Top beam 10 having 10a is fixed, top beam 1
A spindle head 11 is mounted on the sliding guide surface 10a of 0 so as to be movable and positionable. And the tool spindle head 8 and the copy spindle head 11
Both are relatively movable by the control device. A tool spindle sleeve 12 is provided on the tool spindle head 8 so as to be movable and positionable in the Z-axis direction, and the tool spindle 13 is rotatably supported by a plurality of bearings on the tool spindle sleeve 12 and a tool T is detachably attached to the tip. There is. The copying spindle 14 is provided on the copying spindle head 11 so as to be movable and positionable in the Z-axis direction.
A tracer head 15 is attached to the lower end of the. The tool spindle sleeve 12 and the copying spindle 14 can be moved relative to each other by NC control. On the model table 4, two rectangular parallelepipeds 16 for adjustment are placed in parallel with each other in the X-axis direction and the Y-axis direction, and the tracer head 15 is attached to the tip of the copying spindle 14.
Are mounted vertically. As the tracer head 15, for example, the one disclosed in JP-A-54-43231 can be used. This is a tracer shaft that can be displaced in three directions: X-axis, Y-axis and Z-axis.
The three cores for the three directions fixed to the tracer shaft 17 and having the three cores are fixed inside the tracer head body.
The sensor output is inserted into the center hole of each sensor coil for direction, and a coil output proportional to the displacement amount of the tracer shaft 17 is obtained. The tracer head 15 is disclosed in JP-A-54-432.
Needless to say, it is not necessary to limit it to that of No. 31, X-axis, Y
It is also possible to use another one as long as an output proportional to the displacement amount of the tracer shaft 17 can be obtained from each of the sensor coils for two axial directions. A stylus is detachably fixed to the lower end of the tracer shaft 17 with a spherical contactor 18a facing downward. In this stylus, a plurality of styli having different lengths, such as a stylus 18A having a short shaft portion and a stylus 18B having a long shaft portion, are appropriately fixed as necessary by a manual or automatic stylus changing device.

Action Several types of stylus 18A with different lengths are prepared for the tracer head 15 to support various machining of the portal copying machine.
18B ... are sequentially mounted, and the sensor coil output for the stylus displacement amount that varies depending on the stylus length is adjusted to the same value, but two types of procedure, long and short, are shown in the flowchart of FIG. 3 (a) (b). Explained by. The short stylus 18A is attached to the tracer head 15, and the stylus identification number and the stylus displacement direction automatic detection command are input to the NC in step S1. In step S2, the NC-driven copying spindle head 11 is moved to the right in the Y-axis direction in FIG. 1, and the tip contactor 18a of the stylus 18A abuts on the adjustment rectangular cylinder 16 on the model table 4, and the tracer shaft
The core moves in the Y-axis sensor coil via 17, and the sensor coil outputs displacement as a voltage change according to the principle of a differential transformer. When the output voltage starts changing, that is, from the touch point, a certain amount, for example, 1 mm, is moved to the right in the Y-axis direction by an NC command, and the displacement direction is automatically stored in the NC.
The displacement δ _{0 of} A becomes 1 mm.

In step S3, assuming that the output voltage α ₀ V of the sensor coil at this time is 0.9 V, 0.9 V is input to NC.
In step S4, 1 / α _{0, that} is, 1 / 0.9 is calculated and stored in the NC as a constant K corresponding to the stylus identification number and the displacement direction, and the initial set for rightward movement in the Y-axis direction is completed. Subsequently, the initial setting for leftward movement in the Y-axis direction is performed in the same procedure. Subsequently, the same procedure is performed for displacement in the X-axis direction, but α ₀ and α _{i in} this case are outputs from the X-axis sensor coil. Next, the long stylus 18B is attached to the tracer head 15, and the steps S1 to S4 of the initial setting procedure described above are repeated again for each displacement direction of the stylus, and if the output of the Y-axis sensor coil is set to 0.8V, for example, in step S3. In step S4, 1 / 0.8 is calculated and stored in the NC as a stylus identification number input in step S1 and a constant K corresponding to the displacement direction automatically detected in step S2.

As described above, the procedure for normally using the stylus in which each constant K is stored in the NC before machining is described in the model table 4
A model not shown above is fixed, and first a short stylus
When the 18A is attached, the stylus identification number is input in step S5, and in step S6, the stylus 18A moves to the right in the Y-axis direction and the contact 18a abuts against the model to be displaced, and the stylus displacement direction at this time is calculated. When the output power αi of the Y-axis sensor coil in the stylus displacement direction is 0.45V, this 0.45V is input to the NC. In step S7, NC
The constant K corresponding to the stylus identification number and the displacement direction is read from the memory among the constants K stored in
The calculation of × αi is performed. The constant K read is 1 / 0.9
Therefore, 1 / 0.9 × 0.45 = 0.5, that is, the displacement δi of the stylus 18A
Is calculated to be 0.5 mm. In step S8, the displacement amount δi0.5mm of the stylus 18A on the NC device is the stylus identification number,
It is displayed together with the displacement direction. In accordance with this displacement amount δi, the tool T of this machine is moved to the right in the Y-axis direction by NC copying control, and copying processing is performed.

When the stylus 18B is replaced with a long stylus, the stylus identification number is input in step S5.
In S6, the stylus displacement direction is automatically obtained by the NC and the output αi of the Y-axis sensor coil is 0.4V, for example, and 0.4V is input to the NC as αi corresponding to the displacement direction at this time. In step S7, the constant K corresponding to the stylus identification number and the displacement direction is called from the memory. Since this constant K is 1 / 0.8, 1 / 0.8 × 0.4 = 0.5, δi
Is calculated to be 0.5 mm. In step S8, the displacement amount δi0.5mm of the stylus 18B on the NC device is the stylus identification number,
It is displayed together with the displacement direction, and the copying operation is performed by the movement of the tool T of this machine corresponding to the displacement amount δi.

When the contact 18a of the stylus is displaced to the left in the Y-axis direction, the displacement direction of this stylus is automatically obtained in step S6, and the constant K corresponding to this displacement direction is read from the memory in step S7, and the stylus displacement amount is read. δi is calculated. Similarly, δi is calculated for the displacement in the X-axis direction. During actual copying, X axis, Y
The combined displacement of the shaft is supported by the contactor 18a, and the displacements corresponding to the respective directional components are calculated from the sensor coil output αi and the constant K, and the tool T of this machine is moved in the combined direction.

Effect As described above in detail, the present invention causes the stylus detachably fixed to the tracer head to follow the model, detects the stylus displacement by the tracer head, and the NC control copying device uses the output value to determine the tool spindle and the workpiece. In a copying machine that controls the relative movement of the stylus with the attached table, the output values of the tracer heads when the stylus contacts of different lengths are displaced by a certain amount in both the X-axis direction and the Y-axis direction. Input to NC or computer,
Each constant is calculated by this input and the constant movement amount of the contactor and stored in advance, and the stylus's output is calculated according to the output value of the tracer head during normal use and the stylus length used at this time and the constant corresponding to the displacement axis direction. Since the displacement of the contactor is calculated, the output value of the tracer head, which changes each time multiple styluses with different lengths are replaced, can be automatically set to the same sensitivity by the NC or computer, which is complicated. There is no need to adjust the sensitivity of the amplifier, and the use of an automatic stylus conversion device has the effect of enabling fully automatic operation.

[Brief description of drawings]

FIG. 1 is a schematic view of a copying machine, FIG. 2 is an enlarged view of a tip of a tracer shaft and a stylus, FIG. 3 is a flow chart showing an adjustment procedure, and FIGS. 4 (a) and (b) are explanatory views of a conventional technique. Is. 13 …… Tool spindle, 15 …… Tracer head 14 …… Copying spindle 18A, 18B …… Stylus, T …… Tool

Claims (1)

[Claims] 1. A stylus detachably fixed to a tracer head is made to follow a model, a displacement of the stylus is detected by the tracer head, and an NC control copying device makes a relative movement between a tool spindle and a table based on an output value of the tracer head. In a copying machine that controls movement, each output value of the tracer head is input in advance to the NC or computer by a constant displacement amount in both the X-axis direction and the Y-axis direction of the contacts of a plurality of stylus having different lengths. Then, the constants are calculated from the constant displacement amount and the output value for each length of the stylus and the displacement direction of the contact and stored in advance, and the output value of the tracer head during normal use and the use at this time are calculated. A copying method characterized in that the displacement amount of the contact of the stylus is automatically calculated by the constants corresponding to the length of the stylus and the displacement direction. Automatic tracer head sensitivity adjustment method.