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Locating method for large size work pieces in machine work

A large workpiece, machining technology, applied in metal processing, metal processing equipment, metal processing mechanical parts, etc., can solve problems such as inability to use, measurement of workpiece positioning information, and inconvenience in cutting and processing.

Inactive Publication Date: 2003-10-08
TONGJI UNIV
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  • Abstract
  • Description
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  • Application Information

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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.

Method used

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  • Locating method for large size work pieces in machine work
  • Locating method for large size work pieces in machine work
  • Locating method for large size work pieces in machine work

Examples

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Embodiment

[0111] Example: The present invention is applied to the processing of rail beams of Shanghai maglev train. The layout of the processing system is as follows Figure 4 As shown, the two machine tools are five-axis machine tools, the workpiece is located in the middle of the two machine tools, the machine tool X-direction travel is about 30 meters, the full closed-loop control of the grating ruler is adopted, the machine tool column can rotate around the Y axis, and the spindle rotates around the X axis. The relationship between the coordinate systems of the two machine tools is known, and the coordinates of the midpoint of any machine tool can be easily translated to another machine tool.

[0112] Measure by using a sight. The sight is a non-contact measuring device, which measures six points on the workpiece using the workpiece positioning information obtained by the calculation method of the present invention, and then compiles the corresponding processing program, and the CNC mac...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23Q15/00B23Q17/24
Inventor 樊留群张为民朱志浩陈炳森郑永前梁世升
Owner TONGJI UNIV
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