Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems
Patent
1994-09-28
1996-12-31
Ro, Bentsu
Electricity: motive power systems
Positional servo systems
Program- or pattern-controlled systems
318569, 318626, G05B 19416
Patent
active
055897509
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an acceleration/deceleration control apparatus for a numerical control apparatus, and more specifically, to an acceleration/deceleration control apparatus for a numerical control apparatus for carrying out acceleration/deceleration control of a tool in the vicinity of a stroke end.
BACKGROUND ART
Conventionally, a numerically controlled machine tool is arranged such that when a tool is about to move beyond a stroke end set by a limit switch of a machine tool or when the tool is about to enter a prohibited region of a stored stroke limit designated by a program or setting data, an error code is displayed as well as the tool is decelerated and stopped.
Nevertheless, according to this method, since the tool cannot stop at the stroke end if a sufficient distance necessary for deceleration and stopping is not set, a region in which machining can be carried out is set smaller than the size of a stroke. That is, there is a problem in that the region in which machining can be carried out is restricted smaller than a region set by an intrinsic stroke end of a machine tool.
SUMMARY OF THE INVENTION
Taking the above into consideration, an object of the present invention is to provide an acceleration/deceleration control apparatus for a numerical control apparatus capable of moving a tool by making a maximum use of a stroke.
To solve the above problem, according to the present invention, there is provided an acceleration/deceleration control apparatus for a numerical control apparatus for carrying out acceleration/deceleration control of a tool in the vicinity of a stroke end, which comprises stroke end determination means for determining whether or not the tool moves beyond the stroke end based on a preread machining block, and tool feed speed control means for controlling a feed speed of the tool so that the feed speed of the tool is made to a minute speed in the vicinity of the stroke end when the stroke end determination means determines that the tool moves beyond the stroke end.
The stroke end determination means determines whether or not the tool moves beyond the stroke end based on a preread machining block. When the stroke end determination means determines that the tool moves beyond the stroke end, tool feed speed control means controls the feed speed of the tool so that the tool moves at minute speed in the vicinity of the stroke end. The feed speed of the tool is then controlled according to the control and the tool moves at the minute speed in the vicinity of the stroke end.
As a result, the tool does not go across the stroke end and moves in the region within the stroke end at all times. Consequently, the tool can be moved by making maximum use of the stroke without restricting the stroke end to a small region.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a diagram showing an overall arrangement of an acceleration/deceleration control apparatus of a numerical control apparatus according to the present invention;
FIG. 2 is a view explaining feed of a tool according to the present invention;
FIG. 3 is a graph explaining a deceleration distance and an acceleration constant when a tool approaches a stroke end; and
FIG. 4 is a flowchart showing a processing sequence of the present invention.
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 2 is a view explaining feed of a tool according to the present invention. In FIG. 2, a stroke end 2 defines a border of movement of a tool mounting axis of a numerically controlled machine tool. A region beyond the stroke end 2 is set as a prohibited region 30. A tool moves along a locus 1 in an in-stroke region 20 surrounded by the stroke end 2 and carries out machining of a workpiece such as cutting and the like. The tool, which is moved by a numerical control apparatus according to a machining program, starts from a start point P1 and moves up to an end point P2 according to machining blocks N1, N2, . . . , N10.
The tool
REFERENCES:
patent: 3876873 (1975-04-01), Slawson
patent: 3952238 (1976-04-01), Cutler
patent: 4092887 (1978-06-01), Bromer
patent: 4644237 (1987-02-01), Frushour et al.
patent: 4894594 (1990-01-01), Kawamura et al.
patent: 5073748 (1991-12-01), Boehm
Fujibayashi Kentaro
Idei Takashi
Sagara Shoichi
Fanuc Ltd.
Ro Bentsu
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