JPS6232503A - Numerical controller - Google Patents

Abstract

PURPOSE:To curtail an arrangement time of a tool replacement, etc., and to execute a working of a short lead time and a high efficiency, by rearranging and executing a working program in order of the lead time of the best efficiency. CONSTITUTION:First of all, an area for storing a tool which has ended a working already and an area for storing a tool which is executing a working at present are provided on a memory of the inside of a numerical controller. Subsequently, a working program is executed from the head, and it is executed until a tool replacement command. In that state, whether the tool is that which has ended a working or not is checked in advance, and in case of the tool which has ended a working, the next working program is executed after a machine tool has been stopped. When it is not a tool which has ended a working, it is compared with a tool is executing a working at present. If the tool which is executing a working is null, it is stored in an area for the tool which is executing a working. Next, the tool is replaced, and the working program is executed by operating the machine tool. In case of the same as the tool which is executing a working, the working program is executed by operating the machine tool.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a numerical control device having a function of changing the execution order of machining programs so that the number of tool exchanges is minimized.

[Conventional technology]

Traditionally, machining programs (NC tapes) for numerical control devices have been created according to the programmer's way of thinking, but the method of creating these programs has focused on creating programs that are easy for programmers to work with and understand. Not much consideration was given to creating efficient machining programs, such as shortening the machining time of reeds and machines.

An example of a conventional automatic 9-manual programming creation system is shown in FIG. In the figure, 1 is a manual programming system, 2 is an automatic programming system, 6 is a drawing for a workpiece, 4 is a part planner which is a programmer, 5 is an NC (numerical control) device, and 6 is a machined part.

Next, the operation will be explained. First, in operating the NC device 5, the part planner (programmer) 4
NC tape 11 or 21'f is created based on the following.

If the workpiece is a simple shape, is it a process sheet? Create one, bunch one character at a time, and do manual programming 1. In addition, automatic programming 1 is performed using a computer when the shape of υ is complicated, especially when complex and highly accurate machining is required, such as a curved line or curved surface. In the process sheet (K) in manual programming 1, the machining order from drawing 6, how to take machining standards, tool path, cutting conditions, etc. are determined, and the order of machining operations is determined. In addition, in the part program of automatic programming 2, in addition to program translation, grammar checking, etc., processing specification calculations, etc. are performed.

[Problem that the invention seeks to solve]

Machining programs (NC tapes) for conventional numerical control devices were created as described above, so when, for example, many different types of tools are used for cutting, tools are frequently replaced and There were problems such as the time required for tool exchange setup υ, leading to a decrease in machining efficiency.

This invention was made to solve the above-mentioned problems.In order to shorten lead time, the execution sequence of the machining program is completely analyzed and numerical values are changed so as to reduce the number of tool changes. Getting the control device? purpose.

[Means to solve all problems]

The numerical control device according to the present invention has a function of analyzing a machining program in advance and executing a carnivorogram according to an efficient machining order of tool setup 9.

[Effect]

This invention Vi reduces lead time by reducing the number of tool changes in a numerical control device as much as possible and reducing the time required for tool changes.

〔Example〕

An embodiment of the present invention will be described below with reference to the flowchart shown in FIG. First, in the memory inside the numerical control device (factor 5), there is an area for storing tools that have already finished machining (hereinafter referred to as "machined tools") and an area for storing tools that are currently being machined (machining Tools) are provided. The initial values are all blank. (Step 1) Sr1 Next, run the machining program (NC tape) from the beginning,
The tool exchange command (hereinafter referred to as T command) is executed.

(Step 2) ST■ Then, if there is a T command, it is checked in advance whether the tool is a machined tool or not, and if it is a machined tool, the machine tool is stopped and the next machining program is all executed. (Step 3) ST■ If the tool is not a machined tool, compare it with the tool currently being machined. If the tool being processed is blank, it is stored in the tool being processed. Then, the tool is replaced, the machine tool is operated, and the machining program is executed (step 4) ST■ If the tool is the same as the tool being machined, the machine tool is operated and the machining program is executed. (Step 5) ST■ Also, if the tool is different from the tool being machined, the machine tool is stopped and the next machining program is executed. (Step 6) ST■ When the execution of the machining program is completed, it is checked whether the tool being machined is blank. If it is blank, this indicates that all the tools specified by the T command are already machined tools, so machining ends. (Step 7) ST■ If it is not blank, add the tool being machined to the machined tool,
Machining tool 1 [Make it white and run the machining program again from the beginning. (Step 8) ST■ In this way, when executing one machining program, focus on one tool,
Perform only machining using this tool. All machining is completed when machining for all tools used in the machining program is completed.

In the above embodiment, an example was described in which a program change function was provided so that machining was performed in accordance with the order of tools appearing in a machining program, but machining may be performed by giving priority to tools.

〔Effect of the invention〕

As described above, according to the present invention, the machining program of the numerical control device is automatically rearranged and executed within the numerical control device in the order of the most efficient lead time. This has the effect of reducing processing time and enabling highly efficient machining with short lead times.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flowchart of a numerical control device showing an embodiment of the present invention, and FIG. 2 is a diagram for explaining a programming system of a conventional numerical control device. In the figure, 5 is a numerical control (NC) device, and 11° and 21 are NC tapes (processing programs). Patent applicant Mitsubishi Electric Co., Ltd. Procedural amendment (voluntary)

Claims (1)

[Claims] In a numerical control device that performs machining by executing a machining program that has machining specifications programmed for the numerical control device,
When executing the machining program, the memory in the numerical control device automatically analyzes the machining program to reduce the number of tool changes so that machining using the same tool is executed all at once, and then the machining is executed. Characteristic numerical control device.