Guide pipe welding shrinkage control device

Abstract

The invention discloses a guide pipe welding shrinkage control device, and belongs to the technical field of aviation welding guide pipe precision manufacturing. The guide pipe welding shrinkage control device comprises a digital control device and a piping marking device; the digital control device comprises a casing positioner, a pipe support and a digital measurer; a connecting disc is providedat one end of the casing positioner; the casing positioner is coaxially connected with a pipe joint through the connecting disc; the pipe support is used for supporting the casing positioner; the digital measurer is rotatably connected to the casing positioner, and can be rotated to drive the casing positioner to slide in the pipe support; and the piping marking device is fixed on the connectingdisc and used for drawing a circle of weld line at the joint of a guide pipe and the pipe joint. The digital control device and the piping marking device are provided to be used in cooperation; the welding shrinkage variable is obtained by the digital control device and transmitted into the piping marking device; the weld line position before welding is obtained by the piping marking device; and technical guarantee is provided for the gapless welding requirement.

Description

technical field [0001] The invention relates to a welding fixture, in particular to a control device for welding shrinkage of a conduit. Background technique [0002] For precision welded conduits used in aviation, with the iterative upgrade of aircraft, the manufacturing accuracy of conduits is becoming more and more strict. According to the requirements of manufacturing standards, the end face accuracy is required to be controlled at ±0.16mm, and the accuracy requirements are relatively high. At the same time, due to its complex three-dimensional space size and small batch production quantity, the entire manufacturing process of the catheter needs to use the numerical control pipe bending process and welding process. Both of these two processes have long-term difficulties in controlling the amount of springback and welding shrinkage of the pipe. Due to the technical bottleneck, when the catheter is assembled and positioned on the welding fixture, because the amount of weld...

AI Technical Summary

Problems solved by technology

At the same time, due to its complex three-dimensional space size and small batch production quantity, the entire manufacturing process of the catheter needs to use the numerical control pipe bending process and welding process. Both of these two processes have long-term difficulties in controlling the amount of springback and welding shrinkage of the pipe. Due to the technical bottleneck, when the catheter is assembled and positioned on the welding fixture, the amount of welding shrinkage cannot be predicted, and the precision of the finished catheter is difficult to control, which restricts the improvement of the accuracy of the catheter

Moreover, the current flexible intelligent technology is difficult to link the full data of the manufacturing process, and there are inevitably certain data variable errors between the digital model and the product, which also directly affects the digital production and data control of welded catheter manufacturing, and cannot be realized based on Digital manufacturing of current conditions

[0003] At the same time, since the weld shape of the conduit is a circular weld, which does not involve complicated welding methods such as multi-layer welding of thick plates, the welding shrinkage of the conduit is mainly affected by the lateral shrinkage of the welding, and the angular error is also mainly affected by the various welding methods of the conduit. Influence of inconsistency of lateral shrinkage value of weld section

For thin plates, the welding gap has a great influence on the input of welding heat. The larger the gap of the welding seam, the greater the lateral shrinkage of the welding. Theoretically, the shrinkage value of the welding seam with zero distance is The same, but not equidistant welds, the transverse shrinkage will be disordered, and it is difficult to implement engineering control by quantifying variables

During welding, the operator is forced to reduce the welding speed and melt more electrodes to fill the welding gap at the larger weld seam, which causes fluctuations in the welding speed and changes in the welding heat input, resulting in disordered shrinkage coefficient and Angular error increases

The irregular gap of the conduit is harmful to the welding control, making the relationship of various variables indistinguishable and difficult to control. The premise of controlling the lateral shrinkage of the welding is to control the welding gap

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