Cutting methods for seamless steel pipe blanks

Posted by BAOWI STEEL MANUFACTURING CO.,LTD on July 1st, 2024

The cutting methods for seamless steel pipe blanks include gas cutting, shearing, pressing, sawing, etc. At present, gas cutting, shearing, pressing and other methods have been eliminated. Sawing is the most commonly used cutting method. It is suitable for cutting carbon steel, alloy steel, stainless steel, corrosion-resistant alloy and various specifications of pipe blanks. The end face of the pipe blank after cutting is flat and smooth.
The sawing equipment for seamless steel pipe square billets includes circular saws, band saws, grinding wheel saws, friction saws, etc. At present, the most commonly used are circular saws and band saws. Compared with band saws, circular saws have higher production efficiency and occupy less area, but the investment of a single equipment is large. Band saws are the opposite. Grinding wheel saws and friction saws are used less frequently. The cutting efficiency of circular saws is related to the material of the pipe blank, the diameter of the saw blade, the number of teeth, the cutting speed, etc.

The purpose of the end face centering of seamless steel pipe blanks is the end face centering of seamless steel pipe blanks

It is divided into front centering, rear centering, front and rear end centering.

The purpose of centering the front end of the seamless steel tube blank is to ensure that the tip of the blank can accurately align with the center of the blank during biting, so as to avoid uneven wall thickness at the front end of the tube blank. capillary; in addition, the funnel-shaped centering hole at the front end of the blank is conducive to increasing the contact area between the tube blank and the roller before the plug contacts the tube blank, thereby improving the secondary biting conditions; at the same time, the centering hole at the front end of the tube blank can reduce the instantaneous impact between the front end face of the tube blank and the plug head during the secondary biting. , Reduce the wear of the die head and extend the service life of the die head.

The purpose of centering the end of the seamless steel tube blank is not only to reduce production accidents caused by the broken end of the capillary; but also to prevent the "iron ear" from being generated at the end of the capillary, and to avoid bringing the "iron ear" into the hair when inserting the mandrel. The inner hole of the tube scratches the mandrel, causing inward folding and reducing the service life of the mandrel. When rolling large-diameter thin-walled steel pipes, the centering effect of the tail end of the tube blank is more obvious.

The centering of the front and rear ends of the seamless steel tube blank refers to the front end centering the tube blank and the rear end centering the tail end. It has the dual functions of front end centering and tail end centering mentioned above.

The front end or rear end of the seamless steel tube billet does not need to be centered in all cases. For example, when rolling a small diameter thin-walled tube, even if the front end centering is not used, the wall thickness deviation of the front end of the steel tube is not obvious. When rolling a thick-walled tube, tail end centering is not required.

Note: ASTM A53 pipes include seamless and welded, black and hot-dip galvanized nominal (average) wall pipes for coiling, bending, flanging and other special purposes, suitable for welding. Continuously welded pipes are not suitable for flanging.

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