JPH05337822A - Control device for processing machine - Google Patents

Abstract

PURPOSE:To provide a control device for a processing machine, which anticipates that desired dimensions are achieved during grinding, so as to stop a process. CONSTITUTION:Each time when a detector 30 measures the bore dimensions of a workpiece 26, a CPU 42 in a control part 14 computes a machining speed for a grinding process from dimensions measured at the previous time and dimensions measured at the present time. Further, the CPU 42 anticipates a processing time with which the bore dimensions of the workpiece 26 become desired dimensions, from a newest measuring time point, in accordance with the detected newest processing speed, and sets the processing time on a timer 44. Further, the timer 44 delivers a determined dimension signal to the CPU 42 when the remaining processing time becomes zero. The CPU 42 is at once stops a spindle motor 20 and an elevating motor 28 in a measuring part 12. Accordingly, it is possible to anticipate the achievement of desired dimensions even during grinding, thereby it is possible to stop the grinding process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing machine control device,
In particular, the present invention relates to a processing machine control device that intermittently measures the dimensions of a workpiece and controls grinding or cutting similarly to the case where continuous measurement is performed based on the measured values.

[0002]

2. Description of the Related Art Conventionally, a processing machine control device grinds a work piece and simultaneously continuously measures the dimensional change of the work piece. Controls such as processing stop. However, in the case of grinding the inner peripheral surface of a small workpiece, the dimension measuring probe cannot be inserted into the inner peripheral surface simultaneously with the grinding wheel.

Therefore, for such a workpiece,
While the grindstone is grinding the inner peripheral surface of the work piece, the stylus is retracted from the work piece, and when the grindstone recedes from the work piece, the stylus is inserted into the inner surface of the work piece to measure the inner diameter of the work piece. The above operation is repeatedly performed at regular intervals, and the machining control of automatic sizing is performed with the intermittent measured values.

[0004]

However, in the conventional processing machine control device, even if the inner diameter of the workpiece reaches the target dimension during the measurement, that is, during the grinding, the grinding is immediately stopped (fixed). Dimension) signal is not emitted and grinding is continued, and the fixed dimension signal is only emitted at the time of the next measurement, so that there is a drawback that the finished dimension of the inner diameter of the workpiece varies.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a processing machine control device for predicting that a target dimension has been reached during grinding or cutting and stopping the grinding. And

[0006]

In order to achieve the above-mentioned object, the present invention provides a processing machine controller for processing a workpiece to a target dimension value by alternately repeating grinding and measurement at regular intervals. , Every time the dimension of the work piece is measured, based on the latest processing speed detected by the detection means and the detection means for detecting the processing speed from the value measured last time and the value measured this time, the latest It is characterized in that a predicting means for predicting a processing time from the time of measurement to a target dimension value and a stopping means for stopping the processing when the processing time is reached are provided.

[0007]

According to the present invention, every time the dimension of the workpiece is measured, the processing speed of the grinding process is detected by the detecting means from the value measured last time and the value measured this time. Then, based on the latest processing speed detected by the detection means, the processing time from the latest measurement time until the workpiece reaches the target dimension value is predicted by the prediction means. Then, when the processing time is reached, the stopping means stops the processing of the workpiece. This allows
Even during the grinding, the grinding process can be stopped by predicting that the target dimension has been reached.

Also in the cutting process, by using the same means as in the grinding process, it is possible to predict that the target dimension has been reached during the cutting process and stop the cutting process.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a processing machine control apparatus according to the present invention will be described below in detail with reference to the accompanying drawings. In Figure 1,
An example in which the processing machine control device according to the present invention is applied to the grinding control device 10 is shown.
Is composed of a measuring unit 12 and a control unit 14.

The measuring unit 12 includes a grindstone base 16 and a cutting base 1.
8 and. A spindle motor 20 is arranged on the grindstone base 16, and a grindstone 24 is fixed to the tip of a spindle 22 of the spindle motor 20. The grindstone 24 grinds an inner peripheral surface 26a of an object to be measured (hereinafter, referred to as a "workpiece") 26 fixed to the cutting base 18 by moving the grindstone base 16 to the right in the drawing. , The work piece 26 is moved by moving the grindstone base 16 leftward in the drawing.
Retreat from.

The cutting table 18 is arranged so as to be movable in the vertical direction in the drawing by a lifting motor 28, and the work 26 can be fed in the grinding direction by being moved downward in the drawing. Further, a detector 30 is provided on the cutting table 18 so as to be movable in the horizontal direction, and the detector 30 is moved in the left direction in the drawing, so that the pair of dimension measurement probe 3
2 and 32 are inserted inside the work 26 and the inner peripheral surface 26a
Abutted against. At the time of contact, the inner diameter of the work 26 is detected by the detector 30. The detector 30 is
An analog signal indicating the inner diameter dimension data of the work 26 is output to the control unit 14 described above.

The grindstone base 16 and the detector 30 are controlled by a drive controller (not shown) so that the grindstone 24 and the measuring elements 32, 32 are alternately and repeatedly inserted into the inner surface of the work 26 at a constant cycle. Has been done. The control unit 14 includes a preamplifier 34, a comparator 36, a storage circuit 38, and an A
An analog signal output from the detector 30 is amplified by a preamplifier 34, which is composed of a / D converter 40, a CPU 42, and a timer 44. Preamplifier 34
The analog signal amplified by is compared with 0 level by the comparator 36, and only the analog signal at the time when the detector 30 detects the inner diameter dimension of the workpiece 26 is output from the comparator 36 to the memory circuit 38 and sequentially stored.

The analog signal stored in the storage circuit 38 is converted into a digital signal by the A / D converter 40. This digital signal is output to the CPU 42, stored in the memory, and processed by a program circuit (described later) programmed in the CPU 42. Also, CPU4
2, a timing signal 46 indicating the sampling end time of the analog signal sampled for each cycle is output from the storage circuit 38.

Next, the arithmetic processing by the CPU 42 and the machining control of the work 26 will be described. First, CPU4
2 is the work 26 measured in the cycle based on the stored digital signal and the timing signal 46.
The inner diameter dimension of is calculated, the grinding amount of this time is obtained from the dimension value measured last time and the dimension value measured this time, and the machining speed of grinding is detected from this grinding amount and the time t of one cycle. Then, based on the machining speed, the machining time from the current measurement time until the inner diameter dimension of the work piece 26 reaches the target dimension value is predicted, and the predicted machining time is set in the timer 44.

Next, a method of predicting the processing time will be described. The prediction method applied in this example predicts as a function of the change in measured value (y-axis) over time (x-axis). Here, from the predicted time (Te) and the processing speed (a), the predicted time (Te) is represented by a linear function y = ax +
It becomes x in the equation of b.

First, the a is obtained. y = ax + by y = ax + Dg (i) Dg (i) ... i-th measured value Dg (i-1) = ax + Dg (i) a = [Dg (i-1) -Dg (i)] / Tv Tv ... Dg Time from (i-1) to Dg (i) Next, the predicted time (T
Estimate e).

X = [Dg (i) -Dj] / a = [Dg (i) -Dj] / {[Dg (i-1) -Dg (i)] / Tv} Thus, Te = {Tv [ Dg (i) -Dj] / [Dg (i-1) -Dg
(i)]}-Tvc Tvc ... Time from the last storage completion time to the present time Further, the dimension prediction value for an arbitrary elapsed time is y = {[Dg (i-1) -Dg (i)] / Tv} x + b = {[Dg (i-1) -Dg (i)] / Tv} Tvc + Dg (i).

As described above, the CPU 42 predicts the machining time from the latest measurement time to the target dimension value of the work 26 based on the latest machining speed detected for each cycle, and the machining time is calculated as the machining time. The timer 44 is set each time.
In the timer 44, the processing time is updated every cycle and counted down. Then, the timer 44 outputs a sizing signal to the CPU 42 at the timing when the processing time becomes zero. The CPU 42 stops the spindle motor 20 and the lifting motor 28 of the measuring section 12 immediately after the sizing signal is output.

Therefore, in this embodiment, since the grinding process is controlled to stop when the predicted machining time is reached,
The grinding process can be stopped even during grinding. As a result, the variation in the inner diameter of the work 26 can be significantly suppressed as compared with the conventional grinding control device.
In the present embodiment, the grinding process has been described, but the present invention is not limited to this, and it is predicted that the target dimension is reached during cutting by providing the control unit 14 similar to the grinding process even in the cutting process. Then, the cutting process can be stopped.

Further, since the control section 14 of this embodiment converts an analog signal into a digital signal and processes it,
Compared with a control unit that processes with an analog signal, the hardware configuration is simpler, and even if the environment such as temperature and humidity changes, it is not adversely affected, so highly reliable grinding can be performed.

[0021]

As described above, according to the processing machine control device of the present invention, every time the dimension of the workpiece is measured, the processing speed of the grinding process is calculated from the value measured last time and the value measured this time. Based on the latest processing speed detected by the detection means, based on the latest processing speed detected by the detection means, the processing time from the latest measurement time to the target dimension value is predicted by the prediction means, and when the processing time is reached, the stopping means Stop processing with. This allows
Even during grinding, the grinding process can be stopped by predicting that the workpiece has reached the target dimension.

Also in the cutting process, by using the same means as in the grinding process, it is possible to predict that the target dimension has been reached during cutting and stop the cutting process. Furthermore, according to the present invention, since an analog signal is converted into a digital signal for processing, the hardware configuration can be simplified as compared with a processing machine control device that processes with an analog signal, and the temperature and humidity can be further reduced. Even if the environment changes, it will not be adversely affected. Therefore, highly reliable grinding can be performed.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment in which a processing machine control device according to the present invention is applied to a grinding processing control device.

[Explanation of symbols]

 10 ... Grinding control device 12 ... Measuring unit 14 ... Control unit 26 ... Work piece 30 ... Detector 42 ... CPU 44 ... Timer

Claims (2)

[Claims] 1. A grinding machine control device for machining a workpiece to a target dimension value by alternately repeating grinding and measurement at regular intervals, and measuring the dimension of the workpiece each time the previous measurement is performed. Based on the latest processing speed detected by the detection means and the processing speed of the grinding processing from the value measured and the value measured this time, the detection means,
A processing machine control device comprising: a prediction unit that predicts a processing time from the latest measurement time to reach a target dimension value; and a stop unit that stops the processing when the processing time is reached. 2. A cutting machine control apparatus for machining a workpiece to a target dimension value by alternately repeating cutting and measuring at a constant cycle, and measuring the dimension of the workpiece each time the previous measurement is performed. Based on the latest processing speed detected by the detection means and the processing speed of the cutting processing from the value and the value measured this time, the detection means,
A processing machine control device comprising: a prediction unit that predicts a processing time from the latest measurement time to reach a target dimension value; and a stop unit that stops the processing when the processing time is reached.