Expanding device for perforation of seamless steel pipes

Abstract

The invention discloses an expanding device for perforation of seamless steel pipes. The expanding device is applied to a perforator, and comprises a pair of rollers, a steel pipe, an ejector rod, a pair of guide plates and a correction mechanism; the correction mechanism is connected to the inside of the ejector rod, the ejector rod is placed right in the middle of the pair of rollers and the pair of guide plates, the steel pipe is placed between the pair of rollers and the pair of guide plates and attached to the rollers and the guide plates, and the ejector rod penetrates into the steel pipe; and the correction mechanism comprises correction wheels, a trapezoidal gear, an adjustment shaft and a trapezoidal fluted disc. The expanding device can effectively perform roundness shaping on asteel pipe through hole formed after perforation, the generation of an ellipse shape after perforation of the steel pipe is avoided, the uniformity of the wall thickness after perforation of the steelpipe is ensured, and the qualified rate of the finished steel pipe is increased; and the height of the correction wheels extending into a correction gap can be adjusted according to the required perforation aperture of the to-be-machined steel pipe, so that the correct mechanism meets perforation shaping of different steel pipes with different apertures, the applicability of the device is improved, and the device is suitable for popularization.

Description

technical field [0001] The invention relates to the field of steel pipe processing, in particular to a diameter expanding device for piercing seamless steel pipes. Background technique [0002] Seamless steel pipes are made of a single piece of metal with no joints on the surface and have a hollow cross-section. They are widely used in pipelines for conveying fluids, such as pipelines for conveying oil, natural gas, gas, water and certain solid materials, etc. . Seamless steel pipes need to be hot-rolled during the production process, and the most important step in the hot-rolling process is piercing. The existing steel pipe piercing process needs to use a piercer to send the heated tube embryo to the ejector pin by rotating the feeding method, and then squeeze and perforate the tube embryo through the plug to realize the preparation of the hollow steel pipe. [0003] In the patent application publication number CN 203886934 U, a diameter expanding device for seamless stee...

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Problems solved by technology

But it has the following disadvantages: in the above-mentioned application, the ellipticity of the steel pipe is reduced only by adjusting the position of the rolling strip to increase the protruding amount of the plug, but the inner wall of the steel pipe after the perforation cannot be shaped, and the inner wall of the hole after the perforation still exists. The rotation of the steel pipe produces a downward pressure phenomenon, so the formed steel pipe will still have an ellipse phenomenon, which is easy to reduce the yield of the steel pipe perforation, and due to the change of the perforation diameter, the downward pressure will change the wall thickness of the steel pipe, resulting in a uniform pipe wall. , it is easy to cause the tail jam phenomenon caused by instability when the steel pipe is thrown out

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