Thermal expansion amount control method of numerical control flame cutting steel plate part sizes

Abstract

The invention discloses a thermal expansion amount control method of numerical control flame cutting steel plate part sizes. The method includes the steps that the long and short diameter ratio is calculated according to the sizes of pre-cut formed parts; the average temperature T1 of steel plates corresponding to the parts during cutting is estimated according to the thicknesses of the steel plates and the sizes and the shapes of the parts, and the cutting temperature difference delta T=T1-room temperature is calculated; and thermal expansion compensation amounts are calculated, wherein the unilateral thermal expansion compensation amount delta t is added to the kerf compensation K of the parts with the long and short diameter ratio of 1.0-1.3, the unilateral thermal expansion compensation amount delta t1 is added to the short-diameter direction kerf compensation K1 of the parts with the long and short diameter ratio not smaller than 1.2-1.3, and the unilateral thermal expansion compensation amount delta t2 is added to the long-diameter direction kerf compensation K2 of the parts with the long and short diameter ratio not smaller than 1.2-1.3. The corresponding thermal expansion compensation amounts are added to kerfs according to part temperature rise and the long and short diameter ratio, and therefore bad influences of thermal expansion of numerical control flame cutting onthe part sizes are eliminated.

Description

technical field [0001] The invention belongs to the technical field of numerical control flame cutting, and in particular relates to a method for controlling thermal expansion of the size of numerical control flame cutting steel plate parts with simple control method, small and stable size deviation of cutting parts and high cutting efficiency. Background technique [0002] Flame cutting (Flame Cutting) uses the high temperature generated by the combustion of acetylene, propane, natural gas and other flammable gases to cut steel plates. In the field of steel plate flame cutting, with the development of science and technology, high-precision, easy-to-control, high-efficiency semi-automatic flame cutting and CNC flame cutting have been widely used. [0003] However, in the actual CNC flame cutting process, the cutting ignition temperature reaches 1100-1150°C, and the cutting parts on the entire steel plate come first and then later. The temperature of the steel plate is close...

AI Technical Summary

Problems solved by technology

[0005] At present, for the dimensional deviation caused by the thermal expansion in the CNC flame cutting process, a certain amount of thermal expansion compensation △t is generally added to the kerf compensation K based on experience, and there is no feasible theoretical guidance

Due to the limitations of everyone's experience, the value of the thermal expansion compensation △t often leads to large dimensional deviation and instability of the cut parts. Generally, multiple trial cuts and adjustments are required to achieve the predetermined accuracy. Not only the cutting efficiency is low, but also Trial cutting costs are high, and multiple trial cuttings are not allowed for small batches and high-value plates, which greatly restricts the dimensional accuracy and production efficiency of CNC flame cutting

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