Method for manufacturing spring of derrick centralizer
A manufacturing method and centralizer technology, which are applied in the directions of manufacturing tools, heat treatment process control, furnace types, etc., can solve problems such as affecting the normal opening of the derrick centralizer, reducing fatigue strength, and being prone to safety accidents, and reducing intergranular corrosion. , The effect of improving fatigue resistance and improving stability
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[0017] Taking the derrick centralizer steel wire diameter Φ8mm, free length L=752mm, inner diameter Φ42mm, medium diameter Φ50mm, n=82 right-handed tension spring manufacturing method as an example, the present invention will be further described. Its process steps are as follows:
[0018] (1) The spring material is made of austenitic stainless steel wire 0Cr18Ni9;
[0019] (2) Solution treatment: heat to 1080°C±10°C in an RX-65-12Q atmosphere protection furnace, keep it warm for 30min, and then water-cool to room temperature.
[0020] (3) Carry out cold drawing processing to the steel wire, so that the diameter of the steel wire reaches Φ8mm;
[0021] (4) Coil the steel wire on the Z53-8 automatic spring coiling machine;
[0022] (5) Stress-relief annealing: the rolled spring is heated in a JH-75-6Q atmosphere protection tempering furnace at 400±5°C and kept for 25-30 minutes;
[0023] (6) Combine the spring end coils and correct the springs;
[0024] (7) Residual stress ...
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