JPS63185552A - Data creating device for region cutting - Google Patents

Abstract

PURPOSE:To reduce the time for data to be input, by calculating a tool running line pitch for an input shape data to generate its outermost periphery to be left in the fixed direction running of a tool when the simple geometric shape data is input to plural optional positions, in the case of milling. CONSTITUTION:A shape data input part reads a shape data, input on the basis of a machining parts drawing, to store in memory a kind of the data, coordinates, machining region, size, etc., and a crossing point data calculating processing part B performs a process of offsetting a tool radius and a finishing margin from the shape while calculates a tool running pitch so as to generate no cut residue, calculating crossing point coordinates from the obtained running line and the shape data after being offset. Being based on the above, an interference check processing part performs a process of creating a shape of the outermost periphery even if plural shape data interfere and even if one shape data singly exists, and a CL creating part obtains a tool locus creating an NC data. In this way, the time for data input can be reduced by enabling the region cutting data to be automatically created.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an area cutting data creation device for automatically generating area cutting data in milling from input shape data.

(Background technology) Conventionally, when creating NC data for area cutting in milling, inputting data for area processing is very time consuming, and when the amount of data increases, a huge amount of time is required for data input work. For example, as shown in Figure 4, when simple geometric data such as a circle, triangle, and square are input, there are four areas (a).
, (b), (e), and (d). It is necessary to divide the cutting area and input it. This is because, as shown in FIG. 5, there is a constraint that the tool path CL and the shape portion S do not include two or more intersections. Therefore, there is a pressure that the figure definition at the time of data input becomes longer and the amount of input data increases.

In addition, as shown in Fig. 6, the tool path CL is moved in the horizontal direction (
A method has been proposed in which the pitch P of the tool travel line is set constant, and the tool path is automatically created based on input graphic data. However, if the pitch P of the tool running line is made constant, uncut portions will occur on the side surfaces in the tool running direction, as shown by the shaded area in FIG.

Therefore, it could not be removed during finishing machining, or it could cause tool breakage.

In the case of the conventional example shown in FIG. 4 mentioned above, the tool trajectory CL is a trajectory along the input shape data, so
Although there is no uncut material like in the conventional example shown in Fig. 6,
Since it is necessary to check for interference between shapes, it is necessary for a data entry worker to check the data at the time of input, which poses a problem in that the input work takes a very long time.

(Object of the invention) The present invention has been made in view of the above points, and
The object is to provide an area cutting data creation device that can automatically create area cutting data in milling in a short time.

(Disclosure of the Invention) In order to achieve the above object, a region cutting data creation device according to the present invention creates region cutting data according to input shape data. When multiple pieces of simple geometric shape data are input at arbitrary positions as input shape data, the outermost periphery of the input shape data is left uncut by running the cutting tool in a certain direction, and the side surface in the tool travel direction is left uncut. The present invention includes a processing section that calculates the pitch of the tool travel line that will not cause the occurrence of the problem.

The method for calculating the pitch of the tool travel line is shown in Figure 1.
As shown in the figure, in order to avoid leaving any uncut parts on the side surfaces of the shaped part in the running direction, offset line segments are calculated from each shape data, and the pitch between the line segments is calculated without using any fractions, and -), the lowest Decide on the number of times. As a result, the pitch at which the tool travels is no longer constant, and there are portions with a large pitch and portions with a small pitch, and it is possible to prevent uncut edges as shown in the conventional example shown in FIG. 6.

FIG. 3 is a diagram showing a processing flow in the present invention. Shape data input section A reads the shape data input based on the drawing of the machined part, and inputs the shape data type, coordinates, etc.
Set the processing area, size, etc. in memory.

Intersection data calculation processing unit B determines the type of shape from the input data, and performs processing to offset the tool radius and finishing allowance from the shape, and also determines the pitch at which the tool travels, as explained with reference to Fig. 1. Calculate so as not to leave any uncut parts. The intersection coordinates are calculated from the obtained travel line and the shape data after offset, and are stored in memory together with the shape attributes (described later with reference to FIG. 2).

In the interference check processing section C, based on the intersection point data obtained by the intersection point data calculation processing section B, even if multiple pieces of shape data interfere or even if one piece of shape data exists independently,
Processing is performed without creating the shape of the outermost periphery.

In the CL creation section, a tool trajectory is determined from the data obtained by the interference check processing section C, and NC data creation processing is performed.

By having the above processing unit, interference checks for shape data input into the area are automatically performed, and the work of creating NC data, which conventionally took a lot of time, can now be done in a short time. It has become.

In this example, the NC data for leaving a convex part in area cutting, or the NC data for machining four parts, is a self-prescribed shape based on simple geometric data such as a circle, a triangle, or a square. Alternatively, it can be created in a short time based on a single shape without leaving any uncut parts. The processing procedure for machining to leave a convex shape is as follows.
This will be explained along with FIG.

In Figure 2, “I°°,”
゛、°“Bo°” is the shape data obtained by taking the offset of the tool radius and finishing allowance to the input shape data, and “I°°”
is square, and "mouth" to "ho" are circular. Also, ■~[
] indicates the intersection of the tool trajectory CL and the shape data "I°~"BO° (hereinafter referred to as "attributes").

(i) At the first intersection between the tool path CL and the shape data, unconditionally raise the tool height (Z), search for strands with the same attributes, and set the coordinate value to a maximum of 1 straight. . Second
In the example shown, the tool is raised at the intersection ■, and the same attribute
The intersection ■ is the maximum value.

(i;) At the second and subsequent intersections between the tool trajectory CL and the shape data, if the attributes are the same as the intersection when the tool is raised, the tool height (Z) is lowered, and if the attributes are different, the tool height is lowered. Height Z) is changed (do not change), search for the intersection of the same attribute as that attribute, and if the coordinate value is smaller than the maximum value found earlier, no processing is done, and if it is larger, the value is set to the maximum value. In the example in Figure 2, the second intersection ■ has an attribute of “mouth”.
Since this is different from the attribute "A" of the intersection (2) when the tool is raised, the tool height (Z) is left as is, and the maximum value is updated by searching for the intersection (2) having the same attribute "2".

By repeating the above process sequentially, when the intersection point ■ is reached, since the attributes are the same as the intersection point ■, the procedure of lowering the tool height (Z) is applied. Due to the large size, the tool height (Z) is raised.

Using the above method, the attributes of the rise and fall of the tool height at the intersection are determined for each tool trajectory CL, the intersection attributes are calculated for the entire area, and the data is stored in memory. This allows the tool trajectory to be determined so as to leave the outermost periphery of the input shape data.

(Effects of the Invention) As described above, the present invention provides the following effects when a plurality of simple geometric shape data are input at arbitrary positions as input shape data.
Since it is equipped with a processing unit that calculates the pitch of the tool travel line that leaves the outermost periphery of the input shape data by running the cutting tool in a certain direction and does not cause uncut edges on the side surfaces in the tool travel direction, it is possible to The data for area cutting can be automatically created from the machining shape data, which has the effect of significantly reducing data input time.Moreover, the pitch of the tool travel line in the automatically created data is Since it is set so as not to leave any uncut edges on the side surface in the tool running direction, the pitch of the tool running line is constant as in the conventional method, which has the advantage of not leaving any uncut edges on the side surface in the tool running direction. be.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the tool travel line determined by the data creation device of the present invention, FIG. 2 is an explanatory diagram showing how to determine the tool trajectory according to the present invention, and FIG. 3 is an explanatory diagram showing the tool trajectory determined by the data creation device of the present invention. A flowchart showing the processing flow, Fig. 4 is an explanatory diagram showing an example of conventional area cutting data, Fig. 5 is an explanatory diagram showing the relationship between tool trajectory and shape data, and Fig. 6 is an example of cutting processing according to the conventional example. FIG. A is the shape data input section, B is the intersection data calculation processing section, C
is an interference check processing unit, and D is a CL creation unit.

Claims (2)

[Claims] (1) In an area cutting data creation device that creates area cutting data according to input shape data, when multiple pieces of simple geometric shape data are input at arbitrary positions as input shape data, Area cutting characterized by comprising a processing unit that calculates a pitch of a tool running line such that the outermost periphery of the input shape data is left as a result of the running of the cutting tool, and no uncut portion is generated on the side surface in the tool running direction. data creation device. (2) The processing unit that calculates the pitch of the tool running line includes an intersection calculation processing unit that calculates the intersection between the tool running line and the shape obtained by offsetting the tool radius and finishing allowance from the input shape data, and the obtained intersection point data. 2. The area cutting data creation device according to claim 1, further comprising an interference check processing unit that performs an interference check based on and determines whether the tool should be raised or lowered.