Plasma cutting method of elongated sheet metal
A metal sheet and cutting method technology, applied in plasma welding equipment, metal processing equipment, welding equipment, etc., can solve the problems of inconsistent degree and uneven heat dissipation, and achieve the effect of reducing the amount of side bending, facilitating heat dissipation, and narrowing the gap.
Inactive Publication Date: 2009-07-08
SANY HEAVY IND CO LTD (CN)
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Problems solved by technology
[0004] The inventor found through research that, in the prior art, when cutting slender metal plates with plasma, due to the difference in the cutting sequence, the excessively concentrated heat is dissipated unevenly on both sides, resulting in inconsistent degrees of thermal expansion and cold contraction of the two long sides. Side bending occurs, if it can reduce the excessive concentration of heat on one side and solve the problem of uniform heat dissipation on both sides, it can effectively reduce the impact of local high temperature on thermal expansion and contraction, thereby reducing the degree of side bending of slender plates
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[0029] The invention provides a plasma cutting method for slender plates, which can effectively solve the problem of heat dissipation and effectively reduce side bending. B-5 / HG70, B-6 / HG70, t=8 / domex700 are three kinds of lengths to be cut in the following embodiments and comparative examples in the present invention are 9m, and width is the rectangular elongated steel plate of 1m, B-5 / HG70 represents the HG70 type steel plate with a thickness of 5mm, B-6 / HG70 represents the HG70 type steel plate with a thickness of 6mm, and t=8 / domex700 represents the domex700 type steel plate with a thickness of 8mm. The above three types of steel plates are well known to those skilled in the art Types of steel plates, all examples and comparative examples in the present invention use plasma cutting machines well known to those skilled in the art as cutting tools.
[0030] see figure 1 with figure 2 , are respectively the flow chart and schematic diagram of the first embodiment of the ...
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Abstract
The invention discloses a plasma cutting method for a slender metal plate, which comprises the following steps: firstly cut the length of 70%-80% of the middle part of two long sides of the slender metal plate, and each side is divided into at least two cuttings to complete the cutting , the cutting length of the last knife on each side is 90%-110% of the cutting length of the previous knife on the side, and after one knife is cut, the next knife is cut on the opposite long side; Edges, each short edge and the remainder of the two adjacent long edges are cut in one pass. The method provided by the invention can effectively reduce the excessively concentrated heat on one side when the plasma cuts the slender plate, which is beneficial to heat dissipation, thereby solving the problem of uneven heat dissipation on both sides and effectively reducing the amount of side bending.
Description
technical field [0001] The invention relates to a plasma cutting method, in particular to a method for cutting elongated metal plates by using the plasma cutting method. Background technique [0002] At present, the plasma cutting method is widely used as a processing method for high-speed cutting of iron, stainless steel, aluminum and other plates due to its advantages of fast speed and smooth cutting surface. However, when cutting metal sheets, the metal expands rapidly along the cutting direction due to the influence of local high-temperature heat sources, and the surrounding mother metal restricts its expansion, causing compressive stress on the metal at the edge of the cut. When the stress exceeds the yield strength of the metal, the metal compresses Plastic deformation, after cooling, a certain shortening deformation occurs along the cutting direction, and there is a certain residual stress inside, and this shortening deformation will vary with the cutting sequence. ...
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IPC IPC(8): B23K10/00
Inventor欧沩滨陈伟周志鹏卢伟
OwnerSANY HEAVY IND CO LTD (CN)