Method for machining high-precision sealing surface by numerical control gantry mill

Abstract

The invention discloses a method for machining a high-precision sealing surface by a numerical control gantry mill, and relates to the field of a machining method of a numerical control milling machine. The method comprises the following steps: compensating a workpiece regulating inclination included angle alpha by acquiring an error included angle alpha of a cutter plane, and setting the included angle in a numerical control system and enabling a cutter to run along the included angle alpha so as to compensate the error between a ram or a main shaft (namely Z axis) of the gantry mill and the motion direction (namely X axis) of a workbench under the condition of not adding equipment, eliminate jointed tool marks, meet the quality requirement of a product, cancel a bench work process, improve the quality of the product and improve the production efficiency. In the flatness error within 0.02 millimeter on a whole plane of 3,250mm*1,320mm, the method has no obvious jointed tool marks which can pass the examination once in follow-up examination, the contact is complete, the surface roughness is below Ra3.2, the follow-up gantry milling and bench work remaking processes are fully cancelled, and a large amount of time is saved.

Description

technical field [0001] The invention relates to the field of CNC milling machine processing methods, in particular to a CNC gantry milling method for processing high-precision sealing surfaces. Background technique [0002] The horizontal sealing surface of the gas turbine combustor casing has extremely high precision requirements to prevent high-temperature gas leakage. The standard requires the sealing surface of the casing to be closed under the torque specified in the standard, and the inspection of key areas with red and blue oil methods must reach 100%. The contact requirements are not allowed, and the gas leakage channel through the inside and outside is not allowed. Due to the large size of the combustion chamber shell, the length, width and height are generally greater than 3m×1.3m×1.5m, and the sealing surface is generally greater than 3m×1.3m. Generally, factories do not have such a large grinding machine. The usual method is to use the gantry milling press Conve...

AI Technical Summary

Problems solved by technology

Due to the large size of the combustion chamber shell, the length, width and height are generally greater than 3m×1.3m×1.5m, and the sealing surface is generally greater than 3m×1.3m. Generally, factories do not have such a large grinding machine. The usual method is to use the gantry milling press Conventional methods process planes, because there is a perpendicularity error between the gantry milling ram or the spindle and the movement direction of the worktable during installation, and the gantry milling working at room temperature will change the error value at different temperatures, so the machined plane The precision cannot meet the standard requirements, and there are knife marks between adjacent two knives, which seriously affects the processing quality and the effect of red and blue oil inspection. Research requires many repetitions, labor intensity is high, efficiency is low, and product appearance quality is poor

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