JPH05313730A - Nc controller - Google Patents

Abstract

PURPOSE:To perform the working of optimum efficiency without detailed designation of a working program neither speed reduction in a bad condition by inputting information, which calculates the execution speed of the program in accordance with the use condition at each time, by a cutting condition setter. CONSTITUTION:A cutting condition input device 12 is added besides the conventional working program and is connected to a multiblock accelerator/decelerator 3. That is, the cutting condition input device 12 gives a condition, for example, an allowable speed for cutting at each time of working. The multiblock accelerator/decelerator 3 determines a target speed by lover one of the working speed given by the working program and the allowable speed given by an allowable speed computing element 2 and sets the target speed by lower one of the allowable speed of the cutting condition input device 12 and the determined target speed. Thus, the speed does not exceed the allowable speed in the speed control range, and the cutting speed for the cutting condition is automatically determined. Consequently, optimum cutting is performed each time by designation of the fundamental cutting condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an NC control device having a cutting capability improved by adding a device for inputting cutting conditions which are changed each time.

[0002]

2. Description of the Related Art FIG. 2 shows N for explaining a conventional technique.
It is a block diagram of a C control device. First, the machining program input device 1 gives a machining program including information such as a machining trajectory, a machining speed, and an auxiliary machine operation.
In this description, as this information, the processing locus and the processing speed are limited and described. The machine condition setting device 11 sets an allowable acceleration or the like for ensuring the processing accuracy of the machine. The permissible speed calculator 2 calculates the permissible speed from the machining locus and the permissible acceleration. Multi-block acceleration / deceleration device 3
Determines the target speed while selecting the given machining speed and allowable speed, and calculates the speed change distance L from the current speed and acceleration to the target speed and the combined distance L'allowed until the target speed is reached. Then, the composite speed is calculated every moment while measuring the timing of the start of gear shifting. The distributor 4 proportionally distributes the combined speed to each axis, and the servo controller (X) 5 and the motor (X) are distributed.
6, X axis, servo controller (Y) 7 and motor (Y) 8
Y axis, servo controller (Z) 9 and motor (Z) 10
Drive the Z axis respectively. In this way, conventionally, the machine is efficiently moved according to the given machining speed while keeping the accuracy of the machine along the trajectory of the given machining program.

[0003]

In the above-mentioned conventional technique, the restrictions on machining accuracy due to the machine are preliminarily set to N.
It can be set in the C control device. However, regarding the cutting conditions that need to be changed by machining each time, there is no suitable input method, and measures such as specifying the machining speed finely in the machining program each time, reducing the average speed by adjusting the whole to bad conditions, etc. Was by

It is an object of the present invention to provide an NC control device capable of inputting a cutting condition each time without specifying a machining speed in a machining program or reducing an average speed under bad conditions.

[0005]

The present invention which achieves the above-mentioned object, is a machining program input device for inputting a program for machining, a machine condition setting device for setting conditions for maintaining the accuracy of a machine, and this output. A permissible speed calculator that converts information to the permissible speed of the machining program, a multi-block acceleration / deceleration device that further calculates the combined speed at every moment, a distributor that distributes the combined speed to each axis, and a An NC control device having a servo controller for each axis for moving a motor is characterized by including a cutting condition input device for inputting information for calculating an execution speed of a program according to a use condition at each time.

[0006]

In the present invention, the cutting condition setter gives conditions for cutting for each machining, thereby reducing the machining speed according to bad conditions without finely specifying the machining speed information of the machining program. Can be processed with optimum efficiency.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will now be described with reference to FIGS. In this embodiment, in addition to the circuit shown in FIG. 2, a conditional cutting input device 12 is provided, and the multi-block acceleration / deceleration device 3
Connect to. That is, the cutting condition input device 12 provides conditions for cutting each time machining is performed, and further provides, for example, an allowable speed.

In the multi-block accelerator / decelerator 3, in the conventional example of FIG. 2, the target speed is determined by the lower one of the machining speed given by the machining program and the permissible speed given by the permissible speed calculator 2. In this embodiment, the cutting condition input device 12 is further used.
Set the target speed at the lower one by combining the allowable speeds of. Further, the shift start timing is determined by the conventional shift speed L from the current speed and acceleration to the target speed and the combined distance L'allowed until the target speed is reached, but instead of this L 'L'-ΔL to ensure the speed limit range ΔL
To determine the shift start timing.

Here, the concrete cutting will be described with reference to FIGS.
As described in (a) and (b), for example, when cutting with a certain radius r and then cutting with a small radius r ',
When cutting with a tool having a radius r, cutting is performed in a state in which there is an uncut margin as shown in FIG. In such a case, the point is not the restriction on the machine but the restriction on the cutting conditions caused by the tool. Therefore, the cutting condition input device 12 is set as a function of the form shown in FIG. 4, that is, the angle formed by two machining blocks, as a function of the allowable speed V ₀ shown in (a) and the speed limit range ΔL shown in (b). .. When the target speed increases, the current speed is maintained for ΔL. Due to the above, the allowable speed V ₀ is not exceeded within the speed control range. As described above, the cutting speed is automatically determined for the cutting conditions caused by the uncut amount shown in FIG. It is also possible to easily set the minimum cutting speed and maximum cutting speed.

[0010]

EFFECTS OF THE INVENTION According to the present invention, it is not necessary to finely specify a machining program, nor is it necessary to reduce speed under adverse conditions, and it is possible to perform efficient cutting each time by specifying basic cutting conditions.
It is particularly effective in free-form curved surface cutting for dies in which cutting conditions are changed depending on the shape.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional example.

FIG. 3 is an explanatory view of an uncut amount when a radius tool is used.

FIG. 4 is an explanatory diagram for defining an allowable speed and a speed limit range according to an angle between blocks.

[Explanation of symbols]

 1 Machining program input device 2 Allowable speed calculator 3 Multi-block acceleration / deceleration device 4 Distributor 11 Machine condition setting device 12 Cutting condition input device

Claims (1)

[Claims] 1. A machining program input device for inputting a program for machining, a machine condition setting device for setting conditions for maintaining the accuracy of the machine, and an allowance for converting this output information into an allowable speed of a given machining program. An NC having a speed calculator, a multi-block accelerating / decelerating device that further calculates a composite speed every moment, a distributor that distributes the composite speed to each axis, and a servo controller for each axis that drives a motor of each axis. An NC control device, characterized in that the control device is provided with a cutting condition input device for inputting information for calculating an execution speed of a program in accordance with the respective usage conditions.