Method for cutting groove of U-rib steel plate by plasma cutting torches at double variable angles for one time

Abstract

The invention relates to a method for cutting a groove of a U-rib steel plate by plasma cutting torches at double variable angles for one time. The method comprises steps as follows: two sets of plasma batteries and two sets of the plasma cutting torches which can deflect angles are mounted on one plasma numerical control cutting machine; the two plasma cutting torches are configured with cutting torch initial height positioners, cutting torch arc voltage adjusting systems, numerical control systems and PLC (programmable logic controller) systems; a to-be-cut steel plate is placed on a cutting table, the two plasma cutting torches are aligned to the edge of the to-be-cut steel plate, the transverse distance between the two plasma cutting torches and the angles of the two plasma cutting torches are adjusted, and initial positioning values, cutting current and cutting speeds of the two plasma cutting torches are set in the numerical control systems; and a starting button of the cutting machine is pressed, and under the control of the numerical control systems, the two plasma cutting torches simultaneously start arc and cut the U-rib steel plate. According to the method, only one processing process is required, and the U-rib steel plate can be cut for one time, therefore, the operation is simple, automatic cutting is realized, and the straightness of the cut U-rib steel plate, the surface quality of the groove and the angle accuracy all meet the design requirements.

Description

technical field [0001] The invention relates to a processing technology for U-shaped stiffening rib steel plate grooves of bridges, in particular to a method for one-time cutting of U-rib steel plate grooves by a double-variable-angle plasma cutting torch, which belongs to the field of bridge manufacturing technology. Background technique [0002] The U-shaped rib is the stiffener of the orthotropic deck of the steel bridge, and it is an important component of the bridge. The U-shaped rib plate usually used is 6-8mm thick, 300mm wide at the bottom, and about 280mm high, which is a U-shaped section. For the processing of traditional U-ribbed steel plate grooves, most enterprises adopt the process of flame cutting blanking, milling straight edges by large multi-head milling machines, and then hobbing and processing grooves by edge milling machines or chamfering machines. This type of process has many sequences, high labor costs, long processing time, and large losses. The wor...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the disadvantages of poor processing quality or many processing steps of U-ribbed steel plate grooves in the prior art, and provide a double-variable-angle plasma cutting torch that can cut U-ribbed steel plate slopes at one time with easy operation and good processing quality. Using this method, the processing process is fully automatic, which improves the efficiency of U-ribbed steel plate groove processing and ensures the quality of groove processing

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