A piercing machine rolling high-precision capillary equipment and method

Abstract

The invention discloses a high-accuracy tubular billet rolling device and method through a piercing mill. The high-accuracy tubular billet rolling device comprises a skew-rolling piercing mill and anassembly accessory; the assembly accessory is an ejector rod centering accessory or a trolley telescopic mechanism or a trolley heightening mechanism or a combined assembly of any kinds of the ejectorrod centering accessory, the trolley telescopic mechanism and the trolley heightening mechanism; the ejector rod centering accessory is a centering roller; and the centering roller is disposed between a pipe stop apparatus and a trolley of the skew-rolling piercing mill and always embraces an ejector rod of the skew-rolling piercing mill. The trolley telescopic mechanism is a hydraulic cylinder,an ejector column of the hydraulic cylinder is connected with the trolley of the skew-rolling piercing mill, and a cylinder barrel of the hydraulic cylinder is connected with an antithrust seat of theskew-rolling piercing mill. The trolley heightening mechanism comprises a reference block and a sliding seat; the upper surface of the sliding seat is a zero-point horizon reference, and the reference block is disposed on the trolley of the skew-rolling piercing mill. The corresponding improvement measures are taken on an existing skew-rolling piercing mill, the wall-thickness accuracy of a tubular billet is improved, and the problem of the wall thickness deviation of the tail of a thin-wall tubular billet is solved.

Description

technical field [0001] The invention relates to the technical field of piercing machines, in particular to a piercing machine rolling high-precision capillary equipment and method. Background technique [0002] There are two types of piercing machines according to the shape of the rolls: Mann type and mushroom type; according to the arrangement of the rolls, there are two types: horizontal type and vertical type. The oblique rolling piercing machine is widely used in the production of hot-rolled seamless steel pipes. Its function is to pierce the heated round solid tube blank into a hollow capillary tube, and then the capillary tube is further rolled in the next rolling tube extension process. And so on until the finished steel pipe. [0003] The working principle of the skew rolling piercer, as attached image 3 As shown, the heated round solid billet on the front desk is sent into the pass of the piercer, and the billet is brought in by two active rotating rollers by fric...

AI Technical Summary

Problems solved by technology

The stability of the plug and the ejector rod in the production process and the accuracy of the rolling line are guaranteed: the plug jumps or swings freely in the pass, and it is difficult to maintain the stability of the roll gap; when the capillary is threaded, the capillary is along the rolling line (that is, around the ejector rod) Rotate forward, when the front end of the capillary encounters each centering roller, each centering roller opens slightly, holds the capillary, and when the capillary is about to be threaded, all the centering rollers on the background are all slightly opened (that is, the centering roller From the original ejector rod to the capillary holder), there is a large gap between the inner cavity of the capillary tube and the ejector rod, and the ejector rod is not restricted by the centering roller, so there is a larger space for the swing of the ejector rod. The position has fluctuated; if the trolley slide plate and its slide seat slide plate are severely worn, the ejector rod will sink along the center line with the trolley, that is, it will deviate from the rolling line, and the original working position of the plug will further fluctuate and deviate from the rolling line. Therefore, the large lateral deviation of the wall thickness at the tail of the capillary occurs

[0006] The industry has not paid enough attention to the accuracy of perforated capillary tubes for a long time. It is generally believed that the piercing machine is a preliminary rolling mill, and the quality of capillary tubes is not high, which can be eliminated by subsequent extension rolling mills. not much

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