Preparation process of external thread steel pipe for anchor rod

Abstract

The invention discloses a preparation process of an external thread steel pipe for an anchor rod. The preparation process of the external thread steel pipe for the anchor rod comprises the steps that1, a round pipe blank is manufactured into a round workpiece through the procedures of hot punching and diameter and wall reduction continuous rolling; 2, the workpiece is heated to the temperature required by the process, then is put into a heat preservation electric furnace to be subjected to heat preservation homogenization and enters a machining station of an external thread three-roller hot rolling forming device to be rolled; and 3, the rolled workpiece is quenched, cooled, dewatered and tempered to obtain a finished product, wherein in the 2 and the 3, roller sets are used for driving the workpiece to advance to complete the feeding action, and in the tempering step, the included angle between rollers in the roller sets and the advancing direction of the workpiece ranges from 30 degrees to 60 degrees. By means of the mode, the bending deformation of the workpiece under the action of gravity is effectively avoided while the forming quality of the external thread steel pipe for the anchor rod can be obviously improved, the finishing and straightening procedure in traditional production is omitted, and investment of a production line is reduced.

Description

technical field [0001] The invention relates to the field of production of special-shaped steel pipes, in particular to a preparation process of externally threaded steel pipes for anchor rods. Background technique [0002] As a kind of externally threaded steel pipe, the commonly used production process of anchor rod generally includes tube blank production, external thread forming, quenching and tempering, and finishing and straightening to obtain a satisfactory product. The entire production process is relatively long, involving many types of equipment, and investment The amount is relatively large. Moreover, in actual production, it is also found that when the steel pipe first uses a high-frequency sensor to quickly heat the steel pipe in the external thread forming step, and then directly uses the three-roll forming device to roll the external thread, sometimes the external thread rolling fails, resulting in the bolt being used The friction force requirement when ancho...

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Problems solved by technology

[0002] As a kind of externally threaded steel pipe, the commonly used production process of anchor rod generally includes tube blank production, external thread forming, quenching and tempering, and finishing and straightening to obtain a satisfactory product. The entire production process is relatively long, involving many types of equipment, and investment Larger amount

Moreover, in actual production, it is also found that when the steel pipe first uses a high-frequency sensor to quickly heat the steel pipe in the external thread forming step, and then directly uses the three-roll forming device to roll the external thread, sometimes the external thread rolling fails, resulting in the bolt being used The friction requirement when anchoring is not met

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