Method for manufacturing spring of derrick centralizer

Abstract

The invention relates to a method for manufacturing a spring of a derrick centralizer, which comprises the following processing steps: (1) selecting an austenitic stainless steel wire as a material of the spring; (2) performing solution treatment, namely heating the steel wire to between 1,050 and 1,100 DEG C under the protection of atmosphere, preserving the temperature for 25 to 35min, and cooling the steel wire by water to normal temperature; (3) performing cold drawing on the steel wire to make the steel wire have a required diameter; (4) coiling the steel wire on a spring coiling machine; (5) performing relief annealing, namely heating the coiled spring to between 390 and 410 DEG C in a tempering furnace under the protection of atmosphere, and preserving the temperature for 25 to 30 minutes; (6) combining end rings of the spring, and correcting the spring; (7) performing treatment of removing residual stress, namely pressing two ends of the spring tightly to make the rings of the spring combined and formed, heating the spring at a temperature of between 240 and 270 DEG C, preserving the temperature for more than or equal to 3h, and cooling the spring by air to room temperature; and (8) performing one-stage or multi-stage shot cold hardening on the spring. The spring of the derrick centralizer manufactured by the method can strengthen corrosion resistance and fatigue resistance under severe working conditions in oil field, while meeting the requirement on the characteristics of the spring, and.

Description

technical field [0001] The invention relates to a manufacturing method of a derrick centralizer spring. Background technique [0002] The derrick centralizer is an important part of the derrick of the oil truck, and plays a pivotal role in the expansion and contraction of the derrick. Because the ten-meter-long elevating and contracting cylinder of the drilling rig derrick installed on the oil truck is easy to tilt or bend during the expansion and contraction process, resulting in detaching of the cylinder or failure of the derrick to rise, resulting in safety accidents. When the derrick rises to a certain height, the derrick centralizer will automatically open to hold and position the telescopic cylinder, so as to ensure that the telescopic cylinder does not tilt or bend during expansion and contraction to prevent accidents. The key component of the automatic opening of the derrick centralizer is the tension spring. At present, the tension springs made of 65Mn or 60Si2Mn ...

AI Technical Summary

Problems solved by technology

At present, the tension springs made of 65Mn or 60Si2Mn are used on the centralizer of the derrick. This kind of spring is easy to rust under the harsh industrial and mining conditions of the oil field, which makes the diameter of the spring wire smaller and smaller, the fatigue strength is reduced, and it is easy to break. Thereby affecting the normal opening of the derrick centralizer, very prone to safety accidents