Method of machining work in numerically controlled lathe
AssigneeCitizen Holdings Co., Ltd.
InventorsYutaka Shibui, Hajime Matsumaru, Keita Kazuie
Life of this patent
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Abstract
In a method of machining a work in a numerically controlled lathe, it is possible to reduce machining cost by shortening idle time at the time of switching and to enhance the lifetime by lessening a load on a feeding mechanism of a tool rest. After completion of the machining of a work W with a tool T1 on one tool rest (13), the one tool rest (13) is moved to a standby position B and, at the same time, the other tool rest (15) is moved from a standby position D and the feed speed of the other tool rest (15) is controlled such that the one and the other tool rests (13, 15) simultaneously reach positions C and F preset between the work W and the standby positions B and D.
Claims7
A method of machining a work in a numerically controlled lathe having a rotatable spindle, a first tool rest configured to move back and forth relative to the spindle in a spindle axis line direction and in a direction crossing a spindle axis line, and a second tool rest configured to move back and forth relative to the spindle in the spindle axis line direction, the method comprising the steps of:
- judging which of the first tool rest and the second tool rest, tools used in current machining are installed on;
- judging whether tools used in next machining are the tools installed on the first tool rest or the tools installed on the second tool rest;
- judging whether interference is caused between the first tool rest and the second tool rest during movement when, as to the first tool rest and the second tool rest, the tool rest on which the tools used in the current machining are installed is different from the tool rest on which the tools used in the next machining are installed;
- obtaining, for both the first tool rest and the second tool rest, interference boundary positions at which the first tool rest and the second tool rest are in proximity but do not interfere with each other, on movement paths of the respective tool rests, when interference is caused between the first tool rest and the second tool rest;
- moving one tool rest toward a standby position at a fast feed speed when the tool rest on which the tools used in the current machining are installed is different from the tool rest on which the tools used in the next machining are installed;
- obtaining a feed speed for the other tool rest so that the other tool rest on which the tools used in the next machining are installed reaches the interference boundary position within a same time as a time in which the one tool rest reaches the interference boundary position, and moving the other tool rest toward the interference boundary position at an obtained feed speed;
- and
- increasing a speed of the other tool rest to a fast feed speed when the other tool rest passes the interference boundary position so as to move the tools used in the next machining to a machining start position in case where a feed speed obtained for the other tool rest is less than the fast feed speed.
Dependencies are inferred from the claim text.