8/30/2023 0 Comments How to make valve spring collarsIf the design calls for flat ends on the spring, the ends are ground at this stage of the manufacturing process. For example, a spring made of music wire is heated to 500☏ (260☌) for one hour. The spring is heated in an oven, held at the appropriate temperature for a predetermined time, and then allowed to cool slowly. To relieve this stress and allow the steel to maintain its characteristic resilience, the spring must be tempered by heat treating it. Whether the steel has been coiled hot or cold, the process has created stress within the material. At this stage, the steel is too brittle to function as a spring, and it must subsequently be tempered. Then it is immediately removed from the coiling machine and plunged into oil to cool it quickly and harden it. The steel is coiled around a mandrel while red hot. Standard industrial coiling machines can handle steel bar up to 3 in (75 mm) in diameter, and custom springs have reportedly been made from bars as much as 6 in (150 mm) thick. Thicker wire or bar stock can be coiled into springs if the metal is heated to make it flexible. For extension or torsion springs, the ends are bent into the desired loops, hooks, or straight sections after the coiling operation is completed.
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