JPH07219616A - Numerical control information generating device - Google Patents

Abstract

PURPOSE:To generate tool paths for plane machining by calculating the minimum width of machining of a shape from an inputted machining shape and determining the direction of machining with the machining width. CONSTITUTION:An input control part 4 checks inputted machining data DTM and stores them in a machining data storage part 6, and a process data generation part 6 determines machining order from the machining data DTM and generate process data DTP by determines machining processes. A machine data storage part 7 stores data DTS regarding machine specifications in advance and a numerical control information generation part 8 generates numerical control information 9. A machining shape evaluation part 10 reads out the process data DTP generated by the process data generation part 6, evaluates the machining shape and determines an optimum machining direction MD for plane machining, and sends the determined machining direction MD out to the numerical control information generation part 8 to generate the tool paths.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a numerical control information generating apparatus for generating numerical control information for performing flat surface machining using a numerically controlled machine tool.

[0002]

2. Description of the Related Art When creating numerical control information for machining with a numerically controlled machine tool, a numerical control information creation device for automatically creating numerical control information simply by inputting the processing content (machining shape, cutting conditions, etc.) Became popular, and anyone can easily create numerical control information. FIG. 5 is a functional block diagram of a conventional numerical control information creation device, in which the display control unit 2 displays a guide GD of input of processing data necessary for creating numerical control information on the display device 1, and the operator Inputs the processed data DTM from the input device 3 such as a keyboard based on the guide GD displayed on the display device 1.
The input control unit 4 checks the input processed data DTM (for example, checks the input range in numerical values) and stores the processed data DTM in the processed data storage unit 5. Here, the machining data DTM stored in the machining data storage unit 5 includes machining type (milling, pocket machining, etc.), machining shape, machining method (machining direction, machining depth, finishing allowance, etc.), tool data ( (Diameter, material, etc.) and cutting conditions. These processed data DTM are displayed on the display device 1 by the display control unit 2 and can be confirmed by the operator. The process data generation unit 6 determines the processing order for performing actual processing from the processing data DTM stored in the processing data storage unit 5. That is, the machining data input as one machining type is further divided into a plurality of machining steps from the viewpoint of rough machining / finishing machining, and the machining order is determined. Then, process data DTP such as a machining shape, a tool to be used, a cutting condition, a tool path, etc. is generated for each machining process in which the machining order is determined. The numerical control information generation unit 8 includes the process data DTP for each machining process generated by the process data generation unit 6 and data regarding machine specifications stored in advance in the machine data storage unit 7 (minimum rotation speed / maximum rotation of the spindle). The numerical control information 9 is created from the DTS (number, number of attachable tools, etc.).

By the way, in such a numerical control information generating apparatus, a tool path is automatically set by inputting a shape (designated by a closed curve), a machining direction, a machining depth, a finishing allowance, a tool diameter, etc. for planar machining. It has been decided. Here, the processing direction is, for example, in the case of processing the area shown in FIG. 6A, usually, the processing area is one-way cutting (the same figure (b)) in which the tool is always moved in one direction, Zigzag cutting (the same figure (c)) in which the tool is moved in zigzag (reciprocating) is conceivable, and the method of moving the tool is determined by designating the machining direction from these. The tool moving direction for unidirectional cutting and zigzag cutting is parallel to the X axis or the Y axis.

[0004]

In the numerical control information generating apparatus for generating the tool path for such plane machining,
Depending on the machining shape, an inappropriate tool path may be generated in consideration of actual machining. For example, considering a machining shape MS for performing milling as shown in FIG. 7, the conventional numerical control information creating apparatus generates the tool path TP shown in FIG. Not only is the efficiency low, but especially in finishing, a seam of the tool is created, which affects the flatness of the cutting surface. Therefore, it is desirable to generate the tool path TP as shown in FIG. That is, in the conventional numerical control information creation device, while a tool path can be automatically generated from the machining shape, tool diameter, machining direction, etc., depending on the machining shape, an inappropriate tool path is generated in consideration of actual machining. There was a drawback that it would end up. From the above, it is an object of the present invention to provide a numerical control information creation device capable of creating an optimum tool path for planar processing in consideration of actual processing.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a numerical control information creating apparatus for creating numerical control information for performing flat surface machining using a numerically controlled machine tool. A tool for performing flat surface machining based on the machining direction, which includes a machining shape evaluation unit that calculates a minimum machining width for machining the machining shape from the processed machining shape and determines a machining direction in which the machining width is machined. This is accomplished by creating a path. It is also achieved by the machining shape evaluation means determining the tool diameter of a tool for performing planar machining from the machining width.

[0006]

According to the present invention, when the numerical control information for flat machining is created, the inputted machining shape is evaluated, the optimum machining direction is determined, and the tool path is generated based on the machining direction. Since the input machining shape is evaluated, the tool diameter of the optimum tool is determined, and the tool path is generated based on the tool diameter, the optimum control for flat surface machining is performed in the numerical control information creation device. Tool paths can be created.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of a numerical control information creating apparatus for realizing the present invention, which is a display device 1 for displaying a guide GD for inputting machining data necessary for creating numerical control information. Display control unit 2, input device 3 such as a keyboard for inputting the machining data DTM based on the displayed guidance GD, input of checking the inputted machining data DTM and storing the machining data DTM in the machining data storage unit 5 The control unit 4 and the process data generation unit 6 that determines the processing order from the processing data DTM stored in the processing data storage unit 5 and generates the process data DTP for each determined processing process. The stored machine data storage unit 7 and the numerical control information generation unit 8 for creating the numerical control information 9 are the same as those of the conventional device. The machining shape evaluation unit 10 newly added as the device of the present invention is
The process data DTP generated by the process data generator 6 is read, the machining shape in the process data DTP is evaluated, the optimum machining direction MD for performing planar machining is determined, and the determined machining direction MD is determined.
Is sent to the numerical control information generator 8 to generate a tool path.

The function of determining the machining direction in the machining shape evaluation unit 10 will be described below with reference to FIGS. 2 and 3. First, the machining shape evaluation unit 10 includes the process data generation unit 6
By referring to the process data generated in step S2, it is determined whether or not planar processing is performed (S1). Here, if it is not planar processing, nothing is done and the process ends. In the case of plane processing, for example, the processing shape (L1-L2-L3) shown in FIG.
-L4-L5 enclosed shape) (L3-
L4) is deleted to connect the open ends of the line segments (L2, L5) which are the constituent elements of the processed shape related to the recessed segment (L3).
4) is generated, and the processed shape without the concave portion (L1-L2-L
A shape surrounded by 34-L5) is generated (S2). Next, the newly generated machining shape (L1-L2-L34-L5
Each line segment (L1,
The maximum value (L1, L2, L34, L5 for each line segment of the distances from (L2, L34, L5) to each vertex (excluding both end points that form the line segment) that constitutes the machining shape
1, W2, W34, W5) are calculated. Then, the minimum value (W34) among them is set as the minimum processing width for processing this processing shape (S3), and the direction parallel to the line segment (L34) with respect to the processing width (W34) is determined as the processing direction.
(S4).

Therefore, the numerical control information generating section 8 generates a tool path based on the machining direction MD determined by the machining shape evaluating section 10 as shown in FIG. 3 (b). In the embodiment, although the element forming the machining shape is composed of line segments, even if the arc is included, as shown in FIG. 4, for example, the arc ARC of the start point Ps and the end point Pe is calculated. Take points (P1, P2, P3) on the arc so as to divide them equally (4 in the figure), and Ps-P
By considering a straight line LINE that connects 1-P2-P3-Pe, the arc may be linearly approximated to perform the processing.

In the embodiment, only the determination of the machining direction in the machining shape evaluation unit 10 has been described. However, for the calculated machining width (W34), the tool diameter is d, the process data DTP.
Where w is the cutting width (the width that the tool cuts and is entered as a ratio (%) to the tool diameter) during machining in, the tool that satisfies W34 ≤ d × w is selected and It is also possible to determine it as the tool to be used. Further, regarding the determination of the processing direction, the processing explained in the embodiment is performed by replacing the processing shape in the milling processing described in the embodiment with the processing shape in the pocket processing (the contour shape of the region in which the pocket processing is performed). Also, it can be easily applied to the pocket processing, and the processing direction can be determined by using the same processing for the area processing other than the milling processing such as the pocket processing.

[0011]

As described above, according to the numerical control information generating apparatus of the present invention, when the numerical control information of the flat surface machining is generated, the optimum machining path is evaluated after the input machining shape is evaluated. Since it is generated, the cutting efficiency can be improved and the accuracy of the cutting surface can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a numerical control information generation device that realizes the present invention.

FIG. 2 is a flowchart showing a processing flow of a main part of the present invention.

FIG. 3 is an explanatory diagram for explaining a specific process of the present invention.

FIG. 4 is another explanatory diagram for explaining the specific processing of the present invention.

FIG. 5 is a block diagram showing an example of a numerical control information generation device showing a conventional technique.

FIG. 6 is an explanatory diagram for explaining a specific process of a conventional technique.

FIG. 7 is an explanatory diagram for explaining a specific process of a conventional technique.

[Explanation of symbols]

 10 Machining shape evaluation section

Claims (2)

[Claims] 1. A numerical control information creating apparatus for generating numerical control information for performing flat surface machining using a numerically controlled machine tool, wherein a minimum machining width for machining the machining shape is calculated from an inputted machining shape. A numerical control information creating apparatus comprising: a machining shape evaluation unit that determines a machining direction for machining with the machining width, and generates a tool path for performing planar machining based on the machining direction. 2. The numerical control information generating apparatus according to claim 1, wherein the machining shape evaluation means determines a tool diameter of a tool for performing planar machining from the machining width.