Multi-constraint numerical control machining feed rate customization method based on bidirectional proportional adjustment
A technology of ratio adjustment and feed rate, which is applied in the field of multi-constraint CNC machining feed rate customization, can solve problems such as out-of-tolerance machine tool feed system characteristics and reduced processing efficiency, and achieve the effect of ensuring stability and improving machining accuracy
Active Publication Date: 2020-08-04
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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Problems solved by technology
At present, the feed rate planning of commercial CNC systems is usually based on trapezoidal and S-shaped acceleration and deceleration laws, and lacks the consideration of the drive characteristics of machine tool axes
Especially in the process of high-speed machining, in order to avoid the out-of-tolerance of the characteristics of the machine tool feed system, the traditional acceleration and deceleration methods are often conservative in the setting of processing parameters, which greatly reduces the processing efficiency
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[0036] The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and technical solutions. The multi-constraint CNC machining feed rate customization method based on bidirectional proportional adjustment proposed by the present invention firstly scans the machining path according to the process requirements of the part, and determines the bow height error constraint of each sampling point, the speed constraint of the machine tool sub-axis, the sub-axis The upper limit of the maximum feed rate under the acceleration constraint; then, use the B-spline curve to fit the upper limit of the feed rate at discrete points to obtain the initial feed rate curve; finally, take the local minimum point as the base point, A two-way proportional iterative adjustment algorithm is used to adjust the lateral deformation of the initial feed rate curve to obtain the final feed rate that satisfies the given constraints.
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The invention relates to a multi-constraint numerical control machining feed rate customization method based on bidirectional proportional adjustment. The method comprises the following steps of firstly, scanning a machining path according to a part process requirement, and determining a maximum feed rate upper limit value of each sampling point under a bow height error constraint, a machine toolsplit-axis speed constraint and a split-axis acceleration constraint; secondly, fitting the upper limit value of a discrete point feed rate by adopting a B spline curve to obtain an initial feed ratecurve; and finally, taking a local minimum value point as a base point, and adopting a bidirectional proportional iterative adjustment algorithm to carry out transverse deformation adjustment on the initial feed rate curve so as to obtain a final feed rate meeting a given constraint. Motion stability of a machine tool can be effectively improved so that part machining quality, precision and efficiency are guaranteed.
Description
technical field [0001] The invention relates to a multi-constraint numerical control machining feed rate customizing method based on two-way proportional adjustment, and belongs to the technical field of mechanical numerical control machining. Background technique [0002] With the rapid development of my country's aerospace, new energy, ships and other fields, mechanical parts with complex curved cavity structures have been widely used. Especially in some high-end equipment manufacturing, higher requirements are put forward for the processing quality and precision of such parts. As one of the important processing methods in the manufacturing field, CNC machine tools have attracted widespread attention from people in the industry due to their high processing efficiency and stability. Among them, feed rate planning is the core technology of CNC processing. It directly determines the stability and processing quality of CNC machining. At present, the feed rate planning of com...
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IPC IPC(8): G05B19/416
CPCG05B19/4166
Inventor 金鑫刘其广徐飞飞靳水强
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS