Boots – shoes – and leggings
Patent
1990-11-02
1993-04-20
Smith, Jerry
Boots, shoes, and leggings
36447432, 36447433, 36447411, 408 3, G06F 1546, G05B 19403
Patent
active
052048101
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an NC sentence creation system for creating an NC sentence for a two stage drilling operation, and more specifically, to an NC sentence creation system by which a machining time is shortened.
2. Background of the Related Art
FIG. 5 shows a tool feed operation when a two stage drilling operation is carried out by a numerically controlled machine tool using a conventional NC sentence First, a hole 32 is drilled to a workpiece 30 by a first stage drilling operation, then another not shown drill having a smaller diameter is moved by a quick traverse along a tool path 33a to the same point as that of the quick traverse stop point of the first stage drilling operation, i.e., to the point P30 which is spaced from the end 30a of a workpiece by an amount of clearance l31 and moved along a tool path 33b by a cutting feed to drill a hole 34.
Nevertheless, the drill does not make contact with the workpiece 30 from the point P30 to the bottom 32a of the hole 32 during the second stage drilling operation, and thus commanding the drill to be moved by the cutting feed speed in this area would be a waste of machining time.
DISCLOSURE OF THE INVENTION
Taking the above into consideration, an object of the present invention is to provide an NC sentence creation system by which a machining time can be shortened.
To solve the above problem, according to the present invention, there is provided an NC sentence creation system for creating an NC sentence for a two stage drilling operation by which a hole drilled by a first stage drilling operation using a first drill is further drilled by a second stage drilling operation using a second drill having a diameter smaller than that of the first drill, comprising inputting machining configuration data and machining condition data including a first amount of clearance and a second amount of clearance, and creating an NC sentence by which the first drill is moved to the machining end point of the first stage drilling operation by a cutting feed after same has been moved by a quick traverse to the point which is spaced from the end of a workpiece by the first amount of clearance when the first stage drilling operation is carried out, and the second drill is moved to the machining end point of the second stage drilling operation by a cutting feed after same has been moved by a quick traverse to the point which is spaced from the bottom of the hole drilled by the first stage drilling operation by the second amount of clearance, when the second stage drilling operation is carried out.
Cutting configuration data and cutting condition data including amounts of clearance are input to create an NC sentence by which the second drill is moved by a quick traverse to the vicinity of the bottom of the hole drilled by the first stage drilling operation when the second stage drilling operation is carried out.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a flowchart of an NC sentence creation system of an embodiment of the present invention;
FIG. 2 is an NC program created by the NC sentence creation system of the embodiment of the present invention;
FIGS. 3(a) and 3(b) are diagrams showing a tool feed operation carried out by the NC sentence of FIG. 2;
FIG. 4 is a diagram of a schematic arrangement of hardware of an interactive type numerical control apparatus for embodying the present invention;
FIG. 5 is a diagram showing a tool feed operation carried out by a conventional NC sentence.
DESCRIPTION OF THE PREFERRED EMBODIMENT
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 4 is a diagram of a schematic arrangement of hardware of an interactive type numerical control apparatus for embodying the present invention. In FIG. 4, a processor 21 controls the operation of the interactive type numerical control apparatus as a whole in accordance with a system program stored in a ROM 22, which is an EPROM or EEPROM. A RAM 23 is composed of an SRAM in which various da
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patent: 4604705 (1986-08-01), Imanishi
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patent: 4698573 (1987-10-01), Niwa
patent: 4704689 (1987-11-01), Asakura
patent: 4723203 (1988-02-01), Kishi et al.
Fujita Naoki
Matsumura Teruyuki
Nagashima Noritake
Fanuc Ltd.
Garland Steven R.
Smith Jerry
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