Can be the random error of the machine tool divided which 3 kinds be?
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source:MARSTEN CNC Machining
Dispatch of net of machine tool of Chinese numerical control: The random error of the machine tool is caused by exterior condition, suffer outside ambient the impact is bigger. It can divide for: Error of fixed position precision, geometrical precision error, heat is out of shape the error. Machining complex suffers the that we realize these 3 errors simply below respectively carry be out of shape the work of error that cause is when turning, regular meeting gets cutting force, clamping force, force, gravitational the action that wait, arise to be out of shape accordingly thereby, destroyed the correct relative position between cutting tool and workpiece finally, reduced the treatment precision of workpiece. Make an example, when workpiece stiffness far when the stiffness that is less than cutting tool and clamping apparatus, below the action of cutting force, workpiece can is not worth as a result of stiffness and bring about be out of shape, reduced treatment precision thereby. Conversely, when the stiffness of workpiece ambitious Yu Dao provides the stiffness that reachs clamping apparatus when, the cutting tool in machining workpiece process and clamping apparatus can appear be out of shape, also can reduce the precision of workpiece. The random error of the machine tool so, want to choose cutting tool material reasonably, the horn before adding what bolo provides and tool cutting edge angle, undertake reasonable heat treatment machine function in order to improve its to workpiece material. In the meantime, want to raise machining complex stiffness, reduce cutting force and compress their fluctuant amplitude. Internal stress distributings afresh the alleged internal stress of error that cause, it is the stress in interior of without outside force action consist in spare parts namely. On workpiece once produce internal stress, can make workpiece is in a kind high-energy not steady state, thereby instinctively to feebleminded steady state is changed, accompany workpiece to be out of shape, make workpiece loses original treatment precision finally. Make an example, workpiece is after heat treatment, because the wall is large not all, cool not fair consideration, generation internal stress, bring about thereby be out of shape, reduce treatment precision finally. So, when designing a part, should accomplish a wall as far as possible thick even, structural semmetry, in order to reduce the generation of internal stress. Heat is out of shape the error that cause is in accurate treatment and big treatment, machining complex heat is out of shape the impact that machines precision to workpiece is bigger, the 40% ～ that are out of shape by heat the machining error that causes can take workpiece total error sometimes 70% . Machine tool, cutting tool and workpiece get the action of all sorts of heat source, temperature can lift gradually, at the same time they deliver quantity of heat to the material all round and space. Make workpiece and generation of whole machining complex are out of shape thereby, the quantity of heat that passes into when unit time comes loose with its when the quantity of heat that give is equal, machining complex achieved heat to balance position. Make an example, in turning is big process, because cutting force passes to bring about main shaft bearing and temperature of Z axis guide screw to rise greatly, arise thereby bigger be out of shape, so that affect the treatment precision of workpiece. The error of the machine tool has a lot of kinds, develop ceaselessly in the technology today, the machine tool precision that believes us will be taller and taller, can the product with the manufacturing point good more of save worry save labour. CNC Milling