Method for solving cold bending cracks at root parts of transverse ribs of deformed steel bars
A technology for the root of transverse ribs and rebar, which is applied in metal processing equipment, metal rolling, manufacturing tools, etc., can solve the problems of low cooling temperature and transverse rib cracks, increase the contact area, improve cold bending cracks, reduce Stress state and effect of stress concentration phenomena
Inactive Publication Date: 2019-02-05
新疆昆玉钢铁有限公司
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Problems solved by technology
[0002] At present, in order to reduce the production cost, domestic steel mills mostly adopt the controlled rolling and controlled cooling process to produce rebar, but due to the low temperature of controlled cooling, it is easy to crack at the root of the transverse rib during the cold bending test of rebar
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Embodiment 1
[0017] A method for solving cold-bending cracks at the root of rebar transverse ribs, using figure 1 After the normal thread milling and milling cutter head in the machine has processed the transverse rib of the rolling groove, it can be reused figure 2 After resetting the chamfering milling cutter head in the tool, the cutting depth is about 0.7mm.
[0018] Wherein, the included angle of the cutter head of the normal thread milling cutter is 90°, and the bottom of the hole reduces stress concentration;
[0019] The included angle of the chamfering milling cutter head is 135°.
[0020] The raw materials used in the present invention are common raw materials in the production of this area, all can obtain from the market, and can not produce influence for production result; The equipment, and the operation and parameters of each equipment are carried out according to the conventional operation, and there is nothing special about it.
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The invention discloses a method for solving cold bending cracks at root parts of transverse ribs of deformed steel bars. According to the method, a transverse rib chamfering method is adopted: aftertransverse ribs of rolls and roll grooves are milled by using a normal thread milling cutter, a chamfering milling head is changed; and after cutter resetting, depths of about 0.7mm are milled at bottom width positions of the transverse ribs by utilizing the chamfering milling cutter so as to achieve the aims of enlarging the bottom widths of the transverse ribs and increase contact areas betweenthe bottom widths of the transverse ribs and base circles. The method has the advantages of enlarging the bottom widths of the transverse ribs, increasing the contact areas between the bottoms of thetransverse ribs and base circles, decreasing the root stress states and stress concentration phenomena of the transverse ribs during cold bending of deformed steel bars, and improving the cold bendingcracks at the root parts of the transverse ribs.
Description
technical field [0001] The invention relates to a processing method for thread milling transverse ribs in a steel rolling production line in the iron and steel industry, in particular to a method for solving cold-bending cracks at the roots of threaded steel transverse ribs, and belongs to the field of thread milling transverse rib processing methods. Background technique [0002] At present, in order to reduce the production cost, domestic steel mills mostly adopt the controlled rolling and controlled cooling process to produce rebar, but due to the low temperature of controlled cooling, it is easy to crack at the root of the transverse rib during the cold bending test of rebar. Contents of the invention [0003] In order to solve the above problems, the present invention designs a method to solve the cold-bending cracks at the root of the threaded steel transverse rib. After using the chamfer milling cutter, the width of the bottom of the transverse rib is increased, the ...
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IPC IPC(8): B21B15/00
Inventor 邵际平王利徐玉强马加波沈小二王永强高磊李长江张海燕
Owner 新疆昆玉钢铁有限公司