JPH06285748A - Nc data creation method - Google Patents

Abstract

PURPOSE:To eliminate the need for long-time NC data modification and the like by automatically inserting necessary data for tool change into a series of NC data. CONSTITUTION:NC data is sequentially read out of a NC data memory unit and sequentially written on a new NC data memory unit (S6, S7). Subject to the NC data including tool moving orders, the moving distance of a tool is determined in accordance with the NC data such as the tool moving orders (S8). Next, whether the tool should be changed or not is judged. When the moving distance of the tool exceeds the critical machining length of the tool, that the tool should be changed is judged (S9) and necessary NC data is created with the change of the tool and added next to NC data in a new NC data memory unit (S10, S11).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a method of creating C data, which relates to an NC data creation method of automatically inserting NC data necessary for tool replacement into a series of NC data.

[0002]

2. Description of the Related Art A tool installed in an NC machine needs to be replaced at an appropriate time in consideration of machining accuracy and life. In the past, machining length data and machining time data were totaled for each tool, and a skilled worker managed the life of the tool by referring to these data. For example, if it is judged that a single tool is too late for a certain machining to perform a certain machining, first perform the machining within the range that can be machined by one tool, and then use the same properties. I changed it to the tool of the above and performed the whole process. However, the operator of the CAM device is performing the work of inserting the necessary NC data into the series of NC data when the tool is changed, and the NC data is manually modified or recreated according to the instruction from the skilled worker. Was doing.

[0003]

However, the above-mentioned conventional method has a drawback in that it takes a long time to correct the NC data and there is a possibility that mistakes may occur at this time. In particular, while the types of tools and the materials of work pieces are diversifying more and more, the demand for uniform machining surface accuracy is becoming stronger, and the conventional method is not able to meet such requirements.

The present invention was created under the above-mentioned background. The purpose of the present invention is to automatically insert the NC data necessary for tool replacement into a series of NC data. It is to provide a method for creating NC data.

[0005]

A method for creating NC data according to the present invention sequentially reads a series of NC data recorded in an NC data storage device and retrieves workpiece material and tool information of the read NC data. As a key, the tool life data file prepared in advance is searched, and the standard machining length of the tool is obtained by this, while the tool movement distance is calculated based on the read NC data, and the tool movement distance is at most If the standard machining length is reached, it is determined that the tool needs to be replaced, and the N required for tool replacement is next to the NC data.
The feature is that C data is added.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are program flowcharts for creating NC data, FIG. 3 is an explanatory view showing the structure of NC data, FIG. 4 is an explanatory view showing the contents of a tool life data file, and FIG. 5 is an NC before program processing. FIG. 6 is an explanatory diagram of data, and FIG. 6 is an explanatory diagram of NC data after the program processing.

First, the structure of NC data will be described with reference to FIG. The workpiece data represents the material of the workpiece to be machined. The data of the tool number is the number assigned to the tool installed in the NC machine. Tool information data is the type of tool (rough, medium, finish, drill, end mill,
Reamers, etc.), tool material, tool diameter, tool angular radius, tool blade length, and tool blade number.

The data of the machining start information is composed of the movement start point of the tool, the rotational speed of the tool, the direction, and the data for starting the cutting oil. The tool movement command is the tool feed speed,
It is composed of data of tool movement points. Machining end information data includes tool movement end point, tool rotation stop command,
It is composed of the data of the cutting oil stop command.

FIG. 5 shows the N required to operate the NC machine.
C data is shown. A series of NC data is created by using a CAM device and recorded in the NC data storage device in the form of a sequential file. A tool life data file as shown in FIG. 4 is also prepared in advance and recorded in another storage device.

The tool life data file is a database relating to tool life information conversion, and includes a work material, a tool diameter,
It consists of data of tool material, tool radius, tool number, tool length, and standard machining length. Except for the standard processing length, it corresponds to the contents of NC data (see FIG. 3). Here, the standard machining length refers to the longest machining distance that can be machined with one tool.

For example, the blade length is 50 mm, the number of blades is 4, and the tool diameter is φ20.
mm, when using the end mill for rough machining of tool steel to machine a workpiece whose workpiece material is represented by S55C, experimentally (or empirically) determine in advance how long the standard machining length is. deep. If it is found that the standard processing length is 10 m, this data is stored in the storage device in advance. The data file thus obtained is the tool life data file shown in FIG.

Next, a program for automatically inserting the NC data required for tool exchange into a series of NC data will be described with reference to FIGS. 1 and 2.

First, NC data is read from the NC data storage device shown in FIG. 1 (S1). And processing start information,
Based on the tool movement command and the data of the machining end information, the distance traveled by the tool by cutting feed (the total movement distance of the tool) is calculated (S2). After that, the tool life data file is searched using the data of the work material and tool information (tool diameter, tool material, tool radius, tool flute number, tool flute length) as the search key, and the standard machining length data is obtained from this. (S3).

Next, the total movement distance of the tool is divided by the standard machining length, and the number of times the tool is replaced is calculated (S4). Assuming that the number of tool changes is n and the total movement distance of the tool is M, M / (n + 1) is then calculated to obtain the limit machining length of the tool (S
5).

For example, when the standard machining length of the tool is 10 m and the total moving distance of the tool is 27 m, the number of times n of changing the tool is 2
Turning, the limit machining length of the tool is 9m. That is, it means that it is necessary to prepare three identical tools.

The processing from step 1 to step 5 is performed for all NC data, and is temporarily saved in another storage device. When this process ends, the program moves to the program shown in FIG.

First, NC data is stored in the NC data storage device (for convenience of explanation, it is represented as NC data 1).
Are sequentially read and sequentially written in the new NC data storage device (S6, S7). Then, on the assumption that the NC data 1 includes the tool movement command, the movement distance of the tool is obtained based on the data such as the tool movement command of the NC data 1 (S
8).

Next, it is determined whether or not the tool needs to be replaced. If the movement distance of the tool is less than the limit machining length of the tool, it is determined that it is not necessary to replace the tool (S
9) Then, the next NC data (for convenience of explanation, referred to as NC data 4) is read (S6). After that, the same processing as above is performed.

On the other hand, when the moving distance of the tool exceeds the limit machining length of the tool, it is judged that the tool needs to be replaced (S9), and the NC data necessary for the tool replacement is created. It is added next to NC data 1 in the NC data storage device (S10, S11).

This process will be described in more detail. First, a tool number having the same property as the tool is determined from data such as the tool number of NC data 1 (here, tool number 1). Here, the tool number is not registered in the data storage device and is determined by selecting the smallest tool number. If n ≧ 2, n tool numbers are determined. That is, if n = 2, two tool numbers (here, tool numbers 2 and 3) are determined. However, the operator may manually determine the tool number (S10).

When a new tool number is decided, NC data 1
Next, NC data 2 (tool number 2) and NC data 3 (tool number 3) to be added are created. This NC data 2, 3
Is created on the basis of data such as tool information, start machining information, tool movement command, and machining end information of NC data 1. Since the tool movement command and the like required for exchanging the tool of the tool number 1 to the tool of the tool number 2 are prepared in advance in another storage device, the NC data 2 is created by referring to this data. The same applies to NC data 3. When the NC data 2 and 3 are created, they are transferred to the new NC data storage device and added next to the NC data 1 (S11).

Upon completion of such processing, the next NC data 4 is read (S6), and thereafter the same processing as described above is performed. When all the NC data in the NC data storage device have been read, this completes the series of programs. In this process, the newly created NC data 2 and 3 are inserted between the NC data 1 and the NC data 4 (see FIG. 6).

When the NC machine is operated using the series of NC data stored in this new NC data storage device, the following operation is performed. Here, an example will be described in which the standard machining length of the tool is 10 m and the total movement distance of the tool is 27 m, the number of times n the tool is replaced is 2 and the limit machining length of the tool is 9 m.

First, with the tool number 1, the machining distance is 9 m.
Machining is performed until, and then the machining is temporarily stopped, and the tool having the same tool property as the tool No. 1 is automatically replaced with the tool having the tool No. 2. Even with tool number 2, the processing distance is 9m
Machining is performed until, and then the machining is temporarily stopped, and the tool having the same tool property as the tool number 1 is automatically replaced with the tool having the tool number 3. The remaining distance (processing distance is 9 m) is processed with the tool of tool number 3. That is, since the machining lengths of the respective tools are uniform, it is possible to expect merits that the machining surface accuracy is uniform and the machining accuracy is improved even when a plurality of tools having the same properties are machined separately. The same applies to the subsequent operations.

In this embodiment, the limit machining length of the tool is used to determine whether or not the tool needs to be replaced.
The standard processing length may be used.

[0026]

As described above, according to the NC data creating method of the present invention, a series of NC data is automatically inserted as the NC data required when the tool is changed, and the NC data can be corrected. Takes a long time,
At this time, the drawbacks of the conventional method such as making a mistake are eliminated. Therefore, while the types of tools and work materials are becoming more and more diverse, it is possible to fully meet the demands for uniform machining surface accuracy.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an embodiment of the present invention,
It is a program flow chart for creating NC data.

FIG. 2 is a program flowchart following FIG.

FIG. 3 is an explanatory diagram showing a structure of NC data.

FIG. 4 is an explanatory diagram showing the contents of a tool life data file.

FIG. 5 is an explanatory diagram of NC data before program processing.

FIG. 6 is an explanatory diagram of NC data after program processing.

Claims (1)

[Claims] 1. A series of NC data recorded in an NC data storage device is sequentially read, and a tool life data file prepared in advance is searched by using the work material and tool information of the read NC data as search keys. While the standard machining length of the tool is obtained by this, the tool movement distance is calculated based on the read NC data, and if the tool movement distance reaches the standard machining length at most, the tool needs to be replaced. And the N required for tool change next to the relevant NC data.
A method for creating NC data, characterized in that C data is added.