JPS6249515A - Numerical controller - Google Patents

Abstract

PURPOSE:To minimize the dowel time and to improve the working efficiency of a machine to be controlled by inhibiting the execution of the next command before the number of revolution of the spindle of the machine to be controlled reaches the target number of revolution of a dowel. CONSTITUTION:A dowel command is supplied to a central processing part 4 from an input part 1 for control of the actuation of a machine 7 to be controlled. Then the part 4 detects the real number of revolution of the spindle of the machine 7 based on the data detected by a rotation detecting part 3. Furthermore, the part 4 compares the detected number of revolution with the dowel command value and inhibits the execution of the next command before said number of revolution reaches the dowel command value. Thus the dowel time can be set at the minimum level and therefore the working efficiency of the machine 7 is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a numerical control device that delays the operation of a main shaft of a numerically controlled controlled machine by a commanded time.

[Conventional technology]

Conventional numerical control devices, for example, execute the operation of the main axis of a numerically controlled machine during a preset command time,
The next command was output after this command time elapsed, so when creating a program that waits for the spindle to arrive, it is recommended to use a dwell time known from experience or a slightly longer dwell time. I was using my time.

For this reason, the time required for the rotational speed of the spindle to reach the command value is not accurately programmed, but the programmed value is set to an appropriate value in consideration of safety.

[Problem that the invention seeks to solve]

Since conventional numerical control devices are configured as described above, it is necessary to take an unnecessarily long dwell time until the spindle starts operating based on the next command, which reduces the machining efficiency and productivity of the controlled machine. If the dwell time is short, or if the dwell time is short, there is a problem that the next command may occur during the operation of the spindle command, causing damage to tools such as blades.

On the other hand, while the spindle is in motion, its movement (e.g. rotation speed)
Although it is possible to change the command value and the spindle override, there are problems such as the need to change the dwell value of the program every time such a change is made.

This invention was made to solve the above problems, and it is determined whether the rotation speed of the main shaft of the controlled machine has reached the command rotation speed or not, and if it has not reached the command rotation speed, the following The purpose of this invention is to obtain a numerical control device that can perform control without executing commands.

[Means for solving problems]

In the numerical control device according to the present invention, the rotation of the main shaft of the controlled machine to be numerically controlled is detected by the rotation speed detection means,
The dwell command means commands the target rotational speed of the spindle in advance based on a program, etc., and the comparison means compares the detection value of the rotation detection means with the command value of the dwell means, so that the rotational speed of the spindle is determined as the target rotational speed. The processing means does not execute the next command until the next command is reached.

[Effect]

The rotational speed detecting means in the present invention measures the number of pulses of a rotational pulse coder or the like related to the spindle, and based on this count, the actual rotational speed of the spindle 'f! : The comparison means determines whether this rotational speed reaches the dwell rotational speed commanded by the dwell command means or the target rotational speed, and only when it reaches the target rotational speed, the next command can be executed. Works like rc. Therefore, the dwell time can be set to the minimum, and the working efficiency of the controlled machine is completely improved.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, (1) is an input unit such as a tape reader that reads a magnetic tape or the like and inputs the information, and is used as a dwell command means for a dwell command. (2)
(8) is a rotation detecting unit which is a means for detecting rotation of the spindle, which is a feature of the present invention; (4) is the input unit (1) or Next, based on the data or command from the operation unit (2),
The central processing unit calculates and outputs axis data and speed data such as tool movement path data. In this embodiment, it compares and calculates the rotation speed detected by the rotation detection unit (8) and the dwell command value, and calculates the above-mentioned detection. It is an arithmetic processing means that controls not to execute the next command until the rotation speed reaches the dwell command value. (5) is a control unit that outputs command signals such as pulse distribution, spindle startup, tool exchange, etc. to the machine tool (not shown) based on the output of the central processing unit (4), that is, machine control data; (6) is This is a drive unit that drives a machine tool using the above command signal. (7) is a controlled machine that is a machine tool.

In addition, as shown in FIG. 2, the rotation detection section (8) includes a counter (
The timing pulse T generated at regular intervals is equipped with a latch circuit (feather) that stores the value of 8, and the timing pulse T also interrupts the CPU of the central processing unit (4). to occur.

Next, the operation of the above embodiment will be explained.

First, in controlling the operation of the controlled machine, the input section (
From 1), a dwell command is input to the central processing unit (4).

This dwell command is 1 e.g. GO4p 2000 ;(
Wait until the spindle reaches 2000 revolutions per minute]. The central processing unit (4) determines that this program is an instruction to wait until the main speed reaches 200 rpm. - 10,000, central processing "R (4) calculates the actual rotation speed of the spindle based on the data detected by the rotation detection section (8).The calculation method is Then, when the value of the counter (8) when a certain period of time t has elapsed is Pn*1, and the number of pulses generated per spindle rotation is N, the actual spindle rotation speed S is calculated accordingly. The operation based on the next command is not started until the calculated result becomes the same as the dwell command value.

FIG. 3 is a processing flow diagram of the central processing unit that carries out such operations. Here, the command data t- is read from the input section (1) (step ■), and it is determined whether or not the command data is a dwell command (step ■). If it is a dwell command, the command value is Set the target rotation speed (step ■). Then, it is determined whether or not the rotational speed 8 of the main shaft detected by the rotation detection section (8) is equal to the dwell command value A (step (2));
If they are equal, the process ends. On the other hand, if it is determined in step @ that there is no dwell command.

Execute processing for other commands (step ■).

! Figure 4 is a processing flow diagram for calculating the rotational speed of the main shaft.
The counter (81) counts pulses corresponding to the F1 rotation speed (step ■).

Next, based on the count value of this pulse, the actual rotation speed of the spindle is calculated according to equation (1) (step [phase]), and the counter (count value Pn of 8 becomes Pn◆1). At that time, the counting process for that time is completed (step ■).

In addition, in the above embodiment, the case is shown in which the spindle operation by the next command is waited until it completely matches the dwell command value, but when it is detected that the spindle operation has reached near the dwell command value, It may also be possible to automatically proceed to the operation based on the next command.

Further, since a means for comparing the rotation speed of the main shaft with a target rotation speed is adopted, it can be used for constant speed control or variable speed control of the rotation speed of the main shaft.

〔Effect of the invention〕

As described above, according to the present invention, the rotation speed of the main shaft of the controlled machine is detected, and depending on whether or not this rotation speed reaches the dwell rotation speed as the target value, the operation is performed according to the next command. Since the structure is configured to determine whether or not to start the process, it is possible to shorten the total machining time by minimizing the necessary dwell time, thereby improving productivity. This has the effect of overcoming the problem of being too short and causing damage due to tool interference.

[Brief explanation of the drawing]

Fig. 1 is a block connection diagram of a numerical control device according to an embodiment of the present invention, Fig. 2 is a block connection diagram of a rotation detection section, and Fig. 3 shows a dwell process before the main shaft starts operating according to the next command. Processing Flowchart FIG. 4 is a processing flowchart for calculating the rotational speed of the main shaft. (1) is a dwell command means, (8) is a rotation detection means, (
4) is an arithmetic processing means.

Claims (1)

[Claims] A rotation detection means for a spindle of a numerically controlled controlled machine, a dwell command means for inputting a command of a target rotation speed of the spindle commanded in advance by a program, etc., and a detected value by the rotation detection means and the dwell command means. and a calculation processing means for executing dwell control in which the next command is not executed until the detected rotational speed of the spindle reaches the target rotational speed by comparing the rotational speed with the command value of the numerical control device. .