JPH03164908A - Generating device for numerical control program - Google Patents

Abstract

PURPOSE:To facilitate the production of an NC program which produces no the cut remainder nor burr by providing a means which extends an end point of a working shape. CONSTITUTION:At a finish shape input processing part 9, a finished shape is inputted to a finished shape input part 91 via the operation of a keyboard 1 and stored in a finish shape storage part 92. At a working shape correction processing part 10, the nose radius of a tool is read out of a tool information storage part 32 and sent to an extension value calculation part 104. Then the nose radius is stored in an extension value storage part 103 as the extension value. Under such conditions, a working shape correction part 101 produces a corrected working shape based on the working shape stored in a working shape storage part 22, the finish shape stored in the part 92, and the extension value stored in the part 103. Thus it is possible to produce no cut remainder nor burr and to evade the interference with the finish shape completed with extension.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an NC program creation device for creating a numerical control (hereinafter referred to as NC) program suitable for use in finishing or rough machining.

(Prior Art) FIG. 3 is a block diagram showing an example of a conventional NC program creation device, in which input means such as a keyboard 1, machining shape 1, input processing section 2, tool information 1, input processing section 3, NC
Program creation processing unit 4 and NC program output unit 5
It consists of

Machining shape 1, input processing section 2, machining shape 1, input processing section 2, machining shape by operator's keypad operation
1 is input, and this machining shape is stored in the machining shape storage unit 22 as a figure consisting of a series of shape elements such as a series of points, straight lines, circular arcs, etc.

In the tool information 1 input processing unit 3, information on the tool used for machining is inputted into the tool information 1 input unit 31 by the operator's keyboard 1 operation, and the tool information storage unit 3
2 is stored. This tool frJ information is composed of tool shape such as cutting edge angle and cutting edge radius, machining conditions such as cutting speed and feed rate, tool number, tool correction number, etc.

In the NC program creation processing section 4, the machining shape recorded in the machining shape storage section 22 and the tool information stored in the tool information storage section 32 are read out to the NC program creation section 41, and these An NC program for machining the machining shape is created based on the data and stored in the NC program storage section 42. Then, this NC program is outputted to a medium such as a magnetic disk 6, a print 7, a paper tape 8, etc. via the NC program output section 5.

A processing example of the NC program creation device having such a configuration will be described below. For example, point P1 shown in FIG. l'2
．． By processing the processing shape K consisting of P3, the point PI,
P2. P3. l'4. P5. When obtaining the finished shape S consisting of P[i, the operator selects the point Pl1 arc r'll'2 . as the machining shape. While inputting the straight line P2P3 in order,
Determine the tool to be used for machining and input the tool information.

The NC program creation device generates points 1, I'l, P2 . An NC program for machining the machining shape K by moving the tool along the machining shape K in the order of P3 is created. The operator can then take out the created NC program via the medium.

(Problem to be solved by the invention) [-In the conventional NC program creation device described above, the operator creates an NC program by setting the start point of the inputted machining shape as the machining start point and the end point as the machining end point. There was a drawback that uncut parts and cracks were generated at the starting point J6 and the ending point of the shape, resulting in a decrease in processing quality. In order to avoid this, it is necessary for the operator to calculate the shape in which the start point and end point of the machining shape are extended outward, respectively, and input the extended shape into the NC program creation device. Another problem is that the operator is required to have mathematical knowledge and requires complicated calculations, which places a heavy burden on the operator.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide an NC program creation device that can automatically create an NC program that enables good machining.

(Means for Solving the Problems) The present invention relates to an NC program creation device that creates an NC program for machining a machining shape based on input data, and the above object of the present invention is to This is achieved by providing means for extending the end points of the shape.

(Function) The NC program creation device of the present invention has a function of automatically extending the start and end points of the machining shape and at the same time checking for interference with the overhang shape, so that uncut parts and cracks are generated. It is possible to easily create an NC program that does not

(Example) Figure 1 shows an example of the NC program creation device of the present invention.
It is a block diagram shown in correspondence with the figure, the same components are given the same reference numerals, and the explanation is omitted. This NC program creation device includes an input means such as a keyboard 1, a machining shape 1, an input processing section 2, a tool information input processing section 3, an NC program creation processing section 4, a finished shape 1, an input processing section 9, and a machining shape correction process. It consists of a section 10 and an NC program section 5.

In the input processing unit 9, the finished shape obtained by the operator's keyboard 1 operation is the finished shape 1,
The input section 91 inputs this ``A'' upward shape into a series of points and
The finished shape is stored in the finished shape memory section 92 as a closed figure consisting of a sequence of shape elements such as straight lines and circular arcs.

In the machining shape correction processing unit lΩ, the tool information storage unit 3
From the tool information stored in 2, the cutting edge radius of the tool is outputted to the extension amount calculation section +04, and is stored in the extension amount storage section +03 as the cutting edge radius of this tool or the extension amount. Then, the processed shape stored in the processed shape memory section 22,
Recorded in the finished shape memory section 92 1. The Q finished shape and the extension amount stored in the extension amount 1 memory section 103 are read out to the processing shape correction section +01, and a corrected processing shape is created based on these data. That is, the machining shape correction unit 101 first finds a temporary extension point for each of the start saw and end point of the machining shape, and if the found extension point does not interfere with the finished shape, it will actually be extended. The end point extension process is performed, and the obtained shape is made into a corrected processed shape.The corrected processed shape is stored in the corrected processed shape memory unit 1 as a figure consisting of a series of shape elements such as points, straight lines, circular arcs, etc.
02.

Here, the end point extension process will be explained with reference to the flowchart of FIG. 2. First, a temporary extension point P° is obtained by moving the end point P of the processed shape outward by the amount of extension in the tangential direction at the end point P of the processed shape (step 51). Then, it is determined whether or not the temporary extension point P'' is included in the area surrounded by the finished shape, which is a closed figure (step S2). If the tentative extension point P' is not included in the area surrounded by the finished shape, the end point extension process is terminated without extending because interference will occur if the extension is performed.On the other hand, if the tentative extension point P' is not included in the area surrounded by the finished shape, the end point
It is determined whether the straight line Pj!Isu connecting the temporary extension point P" has an intersection with the finished shape (step S3), and the straight line p
If p' has an intersection with the rising shape, extension is not performed because interference will occur if it is extended, and the end point extension processing is terminated. Through this processing, interference can be detected even when the temporary extension point P° or the upward shape is penetrated. On the other hand, straight line PP
' has a finished shape and an intersection! : If there is no S, a straight line PP' is added to the end point of the machining shape to form a corrected machining shape, and the end point extension lAJri is completed.

Next, a specific example of processing performed by the NC program creation apparatus of the present invention will be explained using FIGS. 4, 5, 6, and 7.

Not shown in FIG. 4 are points PI, P2. By machining the machining shape K consisting of P3, the points PI, P2. P3. P4. I'5.
When obtaining the finished shape S consisting of Pli, the operator inputs the finished shape S and tool information 1 to the machining shape.

1. The NC program creation device calculates the extension scale shown in FIG. 5 based on the input tool information, and determines the point PI' and the point P3° shown in FIG. In this case, point PI
' and point P3° do not interfere with the finished shape S, so
By extending the starting point P1 and ending point P3 of the machined shape, points PI', P1 . P2. P3. ' is created in the corrected machining shape consisting of P3', and points PI', PI, P2. P
3. Create an NC program in the order of P3' without moving the tool along the corrected machining shape.

Point P1 shown in FIG. By machining the machining shape K consisting of P2, the point P1. l'2. P3. P4. P5. Pit
When obtaining the finished shape S consisting of the following, the operator inputs the finished shape S and tool information into the NC program creation device as the machining shape. The NC program creation device calculates the extension scale shown in FIG. 7 based on the input tool information, and obtains the point PI' and the point P2 shown in FIG. In this case, since the point P2" interferes with the finished shape S, the end point P2 of the processed shape is extended, and the point I'l' shown in FIG.
, l'1. Create ゛ in the corrected machining shape consisting of I'2,
An NC program is created to move the tool along the modified machining shape K in the order of points PI', PI, and P2.

(Effects of the Invention) As described above, according to the NC program creation device of the present invention, even if the operator does not calculate the J1 of the extended machining shape in advance, there will be no uncut material or burr, and the finished product due to the extension will not be generated. Since an NC program that can avoid interference with the shape can be automatically created, the burden on the operator can be significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of the NC program creation device of the present invention, FIG. 2 is a flowchart for explaining the main operations of the NC program creation device of the present invention, and FIG. 3 is a block diagram of a conventional NC program creation device. A block diagram showing an example,
FIG. 4 is a diagram for explaining a specific processing example in the present invention and a conventional NC program creation device, and FIGS.
FIG. 7 and FIG. 7 are diagrams for explaining a specific example of processing carried out by the NC program creation apparatus of the present invention. 1... Keyboard, 2... Machining shape input processing section, 3
... Tool information input processing unit, 4... NG program creation processing unit, 5... NC program output unit, 6... Magnetic disk, 7... Print, 8... Paper tape, 9
... Finish 1] Shape 1, input processing section, lO... processing shape correction processing section,
21... Machining shape input section, 22... Machining shape memory section, 31... Tool information input section, 32... Tool information storage section, 41... NG program creation section, 42... NG
Program storage section, 91...finished shape 1, input section;
92... Finishing shape memory section, 101... Processing shape correction section, 102... Correction processing shape memory section, 103...
Extension amount storage section, 104... Extension amount calculation section.

Claims (1)

[Claims] 1. A numerical control program creation device for creating a numerical control program for machining a machining shape based on input data, characterized by comprising means for extending end points of the machining shape. Numerical control program creation device. 2. The numerical control program creation device according to claim 1, wherein an extension of an end point of the machining shape is in a tangential direction of the machining shape. 3. The numerical control program creation device according to claim 1, wherein the end points of the machined shape are extended by straight lines. 4. The numerical control program creation device according to claim 1, wherein the extension amount of the end point of the machining shape is calculated from tool information that is one of the data. 5. The numerical control program creation device according to claim 4, wherein the extension amount of the end point of the machining shape is a cutting edge radius of a tool that is one of the tool information. 6. The numerical control program creation device according to claim 1, wherein the extension is not performed when an extension of the end point of the processed shape interferes with the finished shape. 7. The numerical control program creation device according to claim 6, wherein when an extension point of an end point of the processed shape is included in a region surrounded by the finished shape, it is determined that the extended portion interferes with the finished shape. . 8. The numerical control program creation device according to claim 6, wherein when an extension of an end point of the processed shape has an intersection with the finished shape, it is determined that the extended part interferes with the finished shape.