JPH0196702A - Fillet working method - Google Patents

Abstract

PURPOSE:To automatically obtain an NC tool locus by pointing a rough position where a contact is secured between a curved surface and a tool that applies working to said curved surface and the tool moving direction by a graphic display. CONSTITUTION:A fillet working mode is selected out of a tablet menu 14 against the upper and lower curved surfaces 11 and 12 forming a art of a metallic mold. Then a tool diameter is decided and the rough positions 18 and 19 where a spherical tool 13 may possibly have contacts are given to the part on a graphic display 10 where the start of working is desired via the menu 14 and a slice pen 15. Thus an initial start position 20 of the tool 13 is obtained by a program stored in a computer system 16. Under such conditions, the moving direction of the tool 13 is decided via the menu 14 and the pen 15 and the center positions of the tool 13 having contacts with both surfaces 11 and 12 in terms of the external form of the sphere of the tool 13 are continuously obtained. The coordinate values of these center positions serve as the NC tool locus data which are needed for cutting the corner parts of the surfaces 11 and 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a processing method for cutting a corner portion where curved surfaces join, such as when processing a mold.

[Conventional technology]

As a conventional method for processing this type of mold curved surface, there is a method as shown in FIG.

Conventionally, as shown in FIG. 2, an operator scans a curved corner portion 3 of a mold model 20 using a copying head 1 of a scanning machine, operates a stylus 5 provided at the tip of the copying head, and uses an NC tool via a control device 6. It was outputting trajectory data 7.

[Problem that the invention seeks to solve]

However, when creating machining data for a curved corner portion of a workpiece by copying with a conventional scanning machine or the like, there are the following problems.

(1) As shown in Figure 3, when cutting the curved surface of the workpiece and the corners of the curved surface, it is necessary to perform rough machining and semi-finishing while changing the size of the tool. It is necessary to replace the copying stylus 5 for copying, which not only requires a large number of man-hours for copying, but also requires a lot of skill to operate.

(2) In a system that automatically creates a female mold in a computer based on the tracing data of a male model, it is impossible to create the data by tracing with a scanning machine or the like.

The present invention solves the above problems and provides three-dimensional CAD.

The present invention aims to provide a new machining method that makes it possible to automatically generate machining data for curved corner portions of a workpiece using a fillet machining method using a CAM system.

[Means for solving problems]

For this reason, the fillet machining method of the present invention determines the initial tool position by operating the spherical tool at a position substantially tangent to the curved surface (on the graphic display), and then instructs the cutting direction of the tool on the graphic display. By doing so, the spherical tool is continuously rolled so as to be in contact with the curved surfaces, and the cutting tool locus of the corner portion of the workpiece is automatically created.

[Operation] The fillet machining method of the present invention described above uses a graphic display to indicate the approximate position and direction of movement of the tool to be machined between curved surfaces, and to move the spherical tool between curved surfaces and curved surfaces. Fillet curved surfaces are stretched continuously so that they touch each other, and the NC tool trajectory is determined and calculated within the computer system while rolling the fillet surfaces in the same way.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.
In Figure 1, 10 is a three-dimensional CAD that can handle free-form surfaces, etc.
, graphic display in CAM system,
For example, 11 is an upper curved surface forming part of a mold, 12 is a lower curved surface, 13 is a spherical tool for machining the corner of this curved surface, and 14 is a figure input, tool size, machining direction, etc. 15 is a slice pen that indicates the position of the picture on the Sidara quick display 10 that is selected from this menu, 16 is a computer system of CAD, CAM system, 17 is a computer system 16 is the output NC tool trajectory data.

Next, to explain its operation, after selecting the fillet machining mode from the tablet menu 14 for the upper and lower side curved surfaces 11 and 12 that constitute a part of the mold, select the tool diameter, and then 10
Above, select the approximate position 18 and 19 where the spherical tool 13 will come into contact with the part you want to start machining on the tablet menu 14. Apply via slice pen 15. A program in the computer system 16 then determines the correct contact position of the tool 13 and determines the initial starting center position 20 of the spherical tool 13. In this state, the traveling direction of the spherical tool 13 is given via the tablet menu 14 and the slice pen 15, and the center position of the tool 13 where the outer shape of the tool 130 sphere contacts the curved surface 11.12 is continuously determined. The coordinate values of this center position are the NC tool trajectory data for cutting the corner portion of the curved surface 11.12. When the tool 13 continues to advance and hits the surface 22, it stops and requests the next direction of travel. The method of rolling the spherical tool 13 with and \ and determining the contact position of its outer diameter can use the same algorithm as the fillet surface calculation in which the surfaces 11 and 12 are continuously and smoothly rounded.

``In this way, processing data for a corner portion having a free-form surface such as a mold can be processed on the graphic screen 10, thereby eliminating the need for a conventional pencil tracing process using a scanning machine.

If you want to change the diameter of the spherical tool 13 and move from rough machining to semi-finishing, reselect the tool via the tablet menu 14 and slice pen 15 and perform the same operations as before. This is realized by

〔Effect of the invention〕

As described above, according to the fillet processing method of the present invention, the following effects can be obtained.

(1) It is possible to eliminate the need for corner copying (pencil copying) of curved surfaces and curved surface parts, which requires a large number of man-hours for copying using a scanning machine.

(2) In a three-dimensional CAD or CAM system that automatically creates a female mold from a male mold, it is possible to obtain the NC tool locus of the corner portion between curved surfaces even without a mold model to be followed.

[Brief explanation of the drawing]

FIG. 1 shows an outline of an embodiment of the fillet processing method of the present invention. Figure 2 is a schematic explanatory diagram of a conventional copying system;
The figure is an explanatory diagram of the rough cutting of the corner portion. 11.12...Curved surface, 13...Spherical tool, 14...
・Tablet menu, 15...Slice Ben, 16
... Computer system, 17 ... NC tool trajectory data, 20 ... Initial starting center position of tool Steel 1 figure so-called 2 flash Brown 3 shaku 2 bar fork 7 tel

Claims (1)

[Claims] In a processing method where a spherical tool is used to cut a corner part where two curved surfaces join, such as in mold processing, the spherical tool is operated on a graphic display to a position where it is approximately in contact with the two curved surfaces. to determine the initial tool position,
Next, by instructing the cutting direction of the tool to be machined on the graphic display, the spherical tool is continuously rolled so that the curved surfaces come into contact with each other, and the cutting tool trajectory at the corner between the curved surfaces of the workpiece is traced. A fillet processing method characterized by automatic creation.