Core rod for drawing pipe

Abstract

The invention relates to a core rod for drawing a pipe, comprising a core rod body, and the core rod body is a solid pole. The core rod is characterized in that the periphery of the front end of the core rod body is provided with a sleeve, and the end face is provided with a thread counter bore; a sealing piece is fixedly welded on the end face of the sleeve, and the middle part of the sealing piece is provided with a through hole; and the aperture of the through hole is smaller than the outer diameter of the core rod body. After the scheme that the end part of the thinner core rod is additionally provided with the sleeve is adopted, the requirements on concentricity and straightness among an inner die, an outer die, the pipe and the core rod can be better met; jolting phenomena cannot be generated during drawing the pipe; the quality of the drawn pipe is good; and the purpose that the thinner core rod can adapt to the drawing of various pipes with the outer diameters larger than the outer diameter of the core rod after the thinner core rod is simply changed.

Description

【Technical field】 [0001] The invention belongs to a core rod for drawing pipes. 【Background technique】 [0002] In the pipe drawing operation, the mandrel is connected to the drawing inner hole mold, and cooperates with the outer mold to draw the pipe. The mandrel plays the role of positioning the inner mold and bearing a certain drawing force. Therefore, the basic requirement for the mandrel is that the outer diameter is uniform, the length exceeds the workpiece, and it can be smoothly inserted into the inner hole of the workpiece. At present, the mandrel used in the existing drawing process has the following problems: the mandrel with large diameter not only has high manufacturing cost, but also is extremely inconvenient to carry and install, which requires special tools or lifting equipment to complete. Use a mandrel with a smaller diameter to position the inner mold. When drawing the pipe with the outer mold, it is difficult to ensure the concentricity and straightness ...

AI Technical Summary

Problems solved by technology

At present, the mandrels used in the existing drawing process have the following problems: not only the production cost of the large diameter mandrel is high, but also the handling and installation are extremely inconvenient, which requires special tools or lifting equipment to complete

Use a mandrel with a smaller diameter to position the inner mold. When drawing the pipe with the outer mold, it is difficult to ensure the concentricity and straightness among the pipe, the outer mold, and the inner mold. Shaking will occur when the pipe is drawn. Therefore, it is easy to cause problems such as large deviation of the inner hole of the drawn pipe and poor concentricity, thus affecting the quality of the drawn pipe

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