Managing Shop Floor Process Routing Cards in Chinese Manufacturing Contracts
Enforce physical, tamper-sealed shop floor routing cards as mandatory contractual delivery annexes to stop unauthorized process bypasses and secure legal remedies.
Stress Relief Bake
Meaning
Controlled heating processes applied to metal components or printed circuit boards neutralize internal tensions created during casting or machining. Performing a stress relief bake reduces the risk of warpage or dimensional instability when the part is subjected to subsequent finishing operations.
Thermal Protocol
Technicians set the oven to a specific temperature that remains below the critical phase change point of the alloy to avoid changing the grain structure. The duration of a stress relief bake depends on the mass of the parts and the specific requirements of the engineering drawing.
Material Stability
Removing residual stress ensures that components maintain their shape after they are removed from the jigs or fixtures. Without a stress relief bake, a part might twist or bow during final assembly, leading to a failure of the entire mechanical system. This process is mandatory for precision aerospace components where even a small dimensional shift can cause a catastrophic engine malfunction during operation.
Quality Specification
Certification under the GB/T standard requires the facility to maintain digital logs of the temperature profile for every batch. Accurate records for a stress relief bake prove to the customer that the parts meet the safety requirements for high vibration environments.