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The cut long thread of fixed length

Source:     Time:2021-04-16 Hits:

The specific length of billet and finished steel specified by the product standard. Products are produced according tocut to length line. The steel production and use departments can effectively save metal, facilitate production, make full use of equipment capabilities, simplify packaging, and facilitate transportation. Different countries have special regulations on the length of steel. The method of steel sizing varies with the scale of production, the degree of mechanization and automation, and the variety of steels.


simple cut to length line


(1) Use a sizing machine to sizing. The sizing machine is located after the shears or saws, and is used in conjunction with them. There are two main types of sizing machines: portal type and cantilever type. The door-type sizing machine is a device in which multiple sizing baffles are installed in the gantry frame. When in use, different baffles are lifted and lowered by wind or electric power according to the length of the sizing. It occupies a large area and is inconvenient for loading and unloading. The cantilever type sizing machine is driven by a motor to drive a long lead screw, and when the lead screw rotates, the fixed-length baffle moves laterally. The positioning is more accurate. The simplest sizing device is to hang two to three guillotine baffles on a polished rod, and the baffles are manually moved. The sizing machine is commonly used in old-fashioned, small-scale billet workshops and profile bar workshops. When multiple saws are used to cut a long piece of steel at the same time, the fixed length can be adjusted by changing the distance between the saws.


(2) Use flying shears to determine the length. In the continuous bar mill and strip mill finishing line, the cut-to-length length of the steel is adjusted by the special mechanism of the flying shear installed on the production line. The automatic adjustment of the fixed-length length can be realized in different ways: electrical logic circuits and photoelectric elements; crankshaft and transmission gear mechanism; crank pendulum rod and mechanical eccentric or hydraulic eccentric mechanism, etc.


In addition, advanced cursor projection devices or rollers for measuring the length of the steel plate are used in the production of thick plates to determine the length of the steel plate.


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