SU916242A1 - Apparatus for automatic profiling - Google Patents

Description

The invention relates to mechanical engineering, in particular to the machine tool industry for machining parts using copiers. When milling.

A copier is known that contains a rectifier connected in series, a reference element connected by an output to a feed drive control unit and a speed setter [1].

A disadvantage of the known device is the lack of a system for predicting the approach of the tool to another copying angle, as a result of which errors significantly increase when bypassing surfaces with variable copying angles.

The purpose of the invention is to improve the accuracy of processing by reducing the speed of copying ahead when changing the copy angle ..

This goal is achieved in that the device is equipped with series-connected measuring device to the reading surface of the first pulse shaper, the first storage device, connected in series by measuring the distance to the template, the second form2

the pulse generator, the second storage device, the comparison element, the reference and the working pulse owl to the inputs of which the outputs of the first and second memory devices are connected, and the output of this comparison element is connected via a rectifier to the first input of the comparison element

10 neny on speed.

Figure 1 shows the structural

device diagram, FIG. 2 is a structural diagram of the device, in FIG. 3 a pulse generated by a working rotating meter of distance to

15 of the template with the passage of a rectilinear surface> figure 4 and 5 - the pulses generated by the working rotating meter distance to

„Template with the passage of non-rectilinear surfaces.

The device for automatic copying contains a reference meter 1, designed to receive a reference pulse from the counting surface 25, the first driver 3 reference pulses, the output of which is connected to the input of the first storage device 4, the working meter 5 of the distance to the template,

30 second Amortizer 6 workers im3

916242

four

pulse, the output of which is connected to the input of the second storage device 7, the element 8 comparison of the reference and working pulses, amplifier rectifier 9, the element 10 comparison, the unit 11 speed. five

The device works as follows.

In the reference meter 1 at the time of passage of the reference surface 2, a signal is generated, which is supplied to the input of the first driver of 3 pulses. The first pulse shaper generates a pulse, from the output of which it is fed to the input of the first storage device 4, the output voltage of which is directly proportional to the duration of the reference pulse.

In operating the meter 5 at the time of passage of the surface template _{gene-? N} ated operating signal which pos- ^υ blunt input to the second pulse generator 6. The latter forms a working pulse of constant amplitude and a duration equal to the duration of the original working signal. The working pulse from the output of the second shaper 6 pulses is fed to the input of the second storage device 7, the voltage at the output of which is directly proportional to 30 but the duration of the working pulse.

From the outputs of the first storage device 4 and the second storage device 7, the reference and operating voltages are fed to the inputs of the comparison element 35 and 8, from where the difference signal of the reference and operating voltages is fed to the input of the rectifier amplifier 9. The rectifier amplifier amplifies the incoming signal and prepares it in voltage of constant polarity. Then, from its output, the signal arrives at the first input of the comparison element 10. To the second input of the comparison element, a constant voltage and _{0 are} supplied from the speed limiter 45. ₁₁ . Comparison element 10 reduces copying speed and is directly proportional to the size of the incoming signal. <0

With the passage of a surface with a constant copying angle, the duration of the working and reference pulses are equal, the voltage at the output of the comparison element 8 is zero, the voltage at the output of the rectifier amplifier 9 is also zero and the copy speed ν ₀ is equal to the set speed V}.

With the passage of internal corners, the duration of the working pulse exceeds the duration of the reference pulse. The voltage at the output of the second storage device 7 exceeds the voltage at the output of the first storage device 4. The voltage at the output of the comparison element 8 is not equal to zero.

With the passage of external angles, the duration of the working impulse is less than the duration of the reference impulse. The voltage at the output of the second storage device 7 is less than the voltage at the output of the first storage device 4. The voltage at the output of the comparison element 8 is not equal to zero.

From the output of the comparison element 8, the voltage enters the input of the amplifier-rectifier 9, which amplifies it and converts it into a voltage of constant polarity. This voltage is fed to the input of the speed control element 10, which reduces the copy speed.

This device allows you to reduce the speed in advance when the sensor approaches the surface with a different copying angle, which can significantly improve the processing accuracy.

Claims (1)

Claim A device for automatic copying comprising a rectifier connected in series, a comparison element connected to the second input of the comparison element speed controller, a feed control unit and a feed drive, characterized in that, in order to improve processing accuracy, the device is equipped with a series-connected meter to the reading surface, the first pulse shaper and the first storage device, sequentially connected by a meter distance to the template, the second shaper pulses and the second storage device, the second element of comparison of the reference and working pulses, to the inputs of which are connected the outputs of the first and second storage devices, and the output of this comparison element through the rectifier is connected to the first input of the comparison element in speed.