Boots – shoes – and leggings
Patent
1982-11-26
1985-08-13
Ruggiero, Joseph
Boots, shoes, and leggings
318579, 364167, G06F 1546, G05B 1918
Patent
active
045354081
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a numerical control machining method and apparatus wherein a workpiece is machined on the basis of curved surface data defining a curved surface. More particularly, it relates to a numerical control machining method and apparatus wherein an appointed boundary surface is entered as an upper limit or a lower limit for the machining. A determination is made whether a tool lies above or below the boundary surface to machine an upper or lower curved surface with respect to the boundary surface on the basis of the curved surface data which specifies the curved surface when the tool lies above or below the boundary surface.
When machining a metal mold in a three-dimensional shape by means of a profiling machine, it is generally impossible to immediately start the finish machining from a solid material, because of the cutting performance of a machine tool. It is therefore a general practice to rough machine the material in advance, or to finish the mold in several stages by cutting the material in small increments.
A clamp profiling system has been previously proposed in order to perform the rough machining and the finish machining or to perform the several machining stages, as described above, and it has demonstrated its effectiveness. The clamp profiling system is a method wherein a clamp height is previously set so that the material may be cut down to a depth to which the machine tool can cut, the clamp height is lowered at each profiling operation, and the machining of the whole surface of the three-dimensional shape is completed by several profiling operations. With this system, however, the tool strokes the already cut surfaces at low speed in the second and subsequent operations and executes useless motion, which leads to the disadvantage of prolonged machining time.
On the other hand, in a situation where NC (numerical control) command data for machining the curved surface of a metal mold is automatically created by the use of an automatic programming system and where the metal mold is machined on the basis of the NC command data, a first part program for rough machining and a first part program for finish machining must be created and prepared separately from each other. This is disadvantageous in that programming becomes complicated and a memory having a large capacity is required.
SUMMARY OF THE INVENTION
The present invention has an object of providing a numerical control machining method and apparatus which can shorten the machining time of a curved surface and which do not require two part programs, one part for rough machining and one part for finish machining.
In a numerical control machining system in which a workpiece is machined on the basis of curved surface data which defines a curved surface, the present invention is constructed so that first boundary surface data serving as an upper limit and second boundary surface data serving as a lower limit are respectively entered. A determination is made whether a tool lies above the first boundary surface, between the first and second boundary surfaces or below the second boundary surface. A curved surface enclosed by the first boundary surface and second boundary surface is machined on the basis of the curved surface data, and each time the curved surface enclosed by the first and second boundary surfaces has been machined, these first and second boundary surfaces are moved down. The tool is also moved by a rapid-traverse to a position which is determined by the new boundary surfaces and the machining of a curved surface is thereafter started from this position. As a result, according to the present invention, the curved surface can be machined at predetermined cut-depth increments through purely electrical means, and the previously machined surface is not stroked at low speed, so that the machining time can be shortened. Moreover, the invention can be utilized when machining a metal mold, etc. by the use of an automatic programming system. In this case, only one part program for finish machi
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patent: 4025764 (1977-05-01), Tack
patent: 4173786 (1979-11-01), Kuhnell et al.
patent: 4355362 (1982-10-01), Imazeki et al.
patent: 4456864 (1984-06-01), Imazeki et al.
Kishi Hajimu
Seki Masaki
Tanaka Kunio
Fanuc Ltd.
Ruggiero Joseph
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