Method of manufacturing a spring with improved thermal stabilization
A method for manufacturing a spring is disclosed that comprises: forming the spring from a material; heat treating the spring; performing a first machining step to the ends of the spring; subjecting the spring to a first stress relief heat treatment; performing a second machining step to the ends of the spring; and subjecting the spring to a second stress relief heat treatment step. A spring that is manufactured by this method is also described. This spring may then be used in a pressure relief valve, as well as in other assemblies.
1. A method for manufacturing a spring comprises:
forming the spring from a material;
heat treating the spring;
performing a first machining step to the ends of the spring;
subjecting the spring to a first stress relief heat treatment;
performing a second machining step to the ends of the spring;
subjecting the spring to a second stress relief heat treatment step,
wherein said second machining step is a finer machining step than said first machining step to produce a less coarse surface of the spring ends.
2. The method of claim 1 , wherein said first and second machining steps comprise grinding.
3. The method of claim 1 , wherein said heat treating of said spring comprises heat treating the spring according to condition C, AMS 5699.
4. The method of claim 1 , wherein said first stress relief heat treatment comprises compressing the spring to a length that is reduced compared to the spring's original uncompressed length, via the application of a load and whilst also applying heat.