Locating method for large size work pieces in machine work

Abstract

A method for searching the machining position of large workpiece includes such steps as primary fixing on machine-tool, measuring the 2D coordinates of 6 points on the workpiece by the optical reading head on the mainshaft of machine-tool and moving the numerally controlled machine-tool comparing them with theoretical 3D coordinate of said 6 points on CAD model of the workpiece, homogenizing and optimizing the errors to obtain the coordinates of the workpiece in the coordinate system of machine-tool, regulating the position of workpiece in CAD / CAM system, and generating actual machining program. Its advantage is high productivity.

Description

Technical field [0001] The invention belongs to the technical field of machining and manufacturing, and specifically relates to a machining positioning method of a large workpiece. Background technique [0002] In a manufacturing enterprise, a product has to go through many links from design to manufacturing, especially the CNC machining of large and overweight workpieces, which requires a long production preparation time, including programming, transportation, measurement, installation, positioning, and tool preparation of the workpiece. This results in a longer manufacturing time for the entire part. [0003] The processing of large and overweight parts is different from the processing of ordinary parts. The traditional part processing steps are to first analyze the parts according to the design drawings of the parts, determine the process method and processing route, design the fixtures, and perform CNC programming; then the fixtures Positioning on the machine tool, that is, t...

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Problems solved by technology

On the other hand, due to the size and weight of the workpiece, deformation of the workpiece is inevitable, and there may be errors between the shape of the workpiece blank and the design model, but the force of the workpiece in the processing state must be the same as that of the workpiece in actual application. In the same way, it brings inconvenience to the measurement of workpiece positioning information and cutting processing

[0004] The machining of guide rail beams is a typical processing of large overweight and deformed workpieces. The guide rail beams are pre-embedded metal parts in cement prefabricated parts. Due to the large size and deformation of cement prefabricated parts, conventional measurement and positioning methods cannot be used.

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