Boots – shoes – and leggings
Patent
1986-12-19
1989-04-18
Jablon, Clark A.
Boots, shoes, and leggings
36447421, B23Q 1500, G05B 1918, G05B 19403
Patent
active
048232556
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a method of creating an NC program for drilling holes. More particularly, the invention relates to a method of creating an NC program for drilling holes in which a tool use sequence is decided in such a manner that the number of times tools are changed is made close to a minimum value while maintaining a tool use sequences specified by part programs created for each one of holes having different shapes, and the holes are drilled in the tool use sequence.
DESCRIPTION OF THE RELATED ART
An automatic programming apparatus which automatically creates NC programs for drilling holes is available. With such an automatic programming apparatus, data are entered in a conversational mode using a graphic display screen and an NC program for drilling holes is created from a design drawing through a simple operation.
Conventionally, an NC program for drilling holes is created in such a manner that a number of holes are divided into a plurality of groups classified by holes of the same shape (holes of an identical depth, size and type), and all holes constituting one group are drilled followed by drilling all holes in the next group. This process is performed in a similar manner thereafter until all holes are drilled.
Ordinarily, a plurality of tools are used to form a single hole. For example, a screw hole is formed by sequentially executing a center boring step using a center drill, a drilling step using a drill, a countersinking step using a countersink, and a tapping step using a tapper. Accordingly, taking into consideration solely the tool use sequence for each group, we have: to form the holes of one group are also used to form the holes of other groups. Accordingly, if the tool use sequence of tools employed in drilling the holes is skillfully decided, the number of times tools are changed can be made small to shorten machining time.
However, since the conventional arrangement is such that after the drilling of all holes constituting one group is completed, the holes of the next group are drilled, the same tool is selected a number of times. This leads to a large number of tool changes and prolongs machining time.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a hole drilling program creation method through which the number of tool changes can be made small.
The present invention relates to a method of creating a program for drilling holes and has the following steps: creating a part program for every hole of a different shape, each part program comprising records arranged in a machining process sequence and including a tool used and machining depth; checking whether there are tools which can be used commonly for various types of hole machining and finding the tool having the highest frequency of common use; separating each part program, which includes the found common tool as a tool used, at the common tool into an anterior part program section and a posterior part program section, and adopting the following tool selection sequence: tool group used in the anterior part program section.fwdarw.common tool.fwdarw.tool group used in the posterior part program section; deciding a tool selection sequence by repeating the second and third steps for each anterior part program section and each posterior part program section until there are no more common tools, respectively; and creating a combined part program comprising records arranged in the tool selection sequence decided.
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1(A)-1(E) are schematic explanatory
views of the method of the present invention;
FIG. 2 is a block diagram of an automatic programming apparatus to which the present invention can be applied;
FIG. 3 is a flowchart of processing according to the present invention;
FIG. 4 is a part program explanatory view;
FIG. 5 is a combined part program explanatory view; and
FIG. 6 is an explanatory view of processing for revising a hole drilling program.
DESCRIPTION OF THE PREFERRED EMBODIMENT
FIG. 1 is a schematic expla
REFERENCES:
patent: 4528633 (1985-07-01), Sakai et al.
patent: 4547854 (1985-10-01), Hashimoto et al.
patent: 4550375 (1985-10-01), Sato et al.
patent: 4667294 (1987-05-01), Shima et al.
Onishi Yasushi
Tanaka Kunio
Fanuc Ltd
Jablon Clark A.
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