Composite spinneret for small-specification wire rod and manufacturing method thereof

Abstract

The invention discloses a composite spinneret for a small-specification wire rod and a manufacturing method thereof. The composite spinneret comprises a reinforcing section and a conventional section,which have tubular shapes, wherein the inner diameter of the reinforcing section is smaller than that of the conventional section; a tubular connection part is coaxially and fixedly arranged at an end part of the reinforcing section; the inner diameter of the connection part is the same as that of the reinforcing section; the outer diameter of the connection part is smaller than that of the reinforcing section and is the same as the inner diameter of the conventional section; the connection part is embedded into an input end of the conventional section; and an output end of the reinforcing section is welded and fixed with the input end of the conventional section. The composite spinneret disclosed by the invention has the advantages of relatively low cost and long service life; and the problem that non-planning on-line maintenance is caused by spinneret abrasion and perforation so that the stability of a production order is influenced is solved.

Description

Technical field [0001] The invention relates to the technical field of spinning tube production, in particular to a composite spinning tube used for small-sized wires and a manufacturing method thereof. Background technique [0002] The laying machine is the key equipment of the high-speed wire rod finishing mill production line. It is located between the water cooling section of the finishing mill's rear-controlled cooling line and the bulk coil conveyor. The spinning tube is one of the most important parts of the spinning machine. Under the combined action of the driving force, relative inertia force, friction force, and positive pressure caused by the pinch rod and the spinning machine, the wire is changed from linear motion to spiral motion. , Forming a stable coil with a diameter of approximately Ф1080mm and spit out from the spinning tube. [0003] Spinning tube is the key to controlling the transformation of wire from straight line to wire rod. The production speed of high-...

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Problems solved by technology

[0005] At present, 9Cr1Mo material is generally used in the production of spinning tubes in China. During the high temperature (700-950°C) and high-speed (120m / s) wire rolling process, the strength and wear resistance often cannot meet the production requirements, and the service life is short. At the same time, due to the rapid change of the curvature of the entrance section of the spinning tube, the friction force of the first strong bending section of the spinning tube head (introduction section 300-500mm) is relatively large, which is easy to cause obvious scratches, and often occurs due to the wear of the spinning tube. The unplanned downtime and maintenance caused by perforation and perforation have seriously affected the stability of production order

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