Process development is responsible for translating design requirements into manufacturing routes. The process sequence, positioning plan, machining allowance and inspection nodes need to be considered together in conjunction with the characteristics of the part.

First, establish a correspondence between features and processes.

It’s useful to list the main characteristics of parts, the processes involved, and the inspection methods in the same table, so that any omissions or repetitions in the processes can be identified. For common benchmarks or related dimensions, their status across different processes must be taken into account, rather than simply arranging them by type of equipment.

What should trial production verify?

Trial production isn’t just about confirming whether parts can be manufactured; it also involves ensuring that positioning is stable, transitions between processes are smooth, and inspections can be carried out effectively. Recording actual conditions when abnormal situations occur helps to distinguish between problems caused by the process itself and those caused by accidental operations, providing factual basis for improving the process.

During the trial production phase, process assumptions can be verified using actual processing and testing results. For unstable aspects, issues and conditions should be recorded, and solutions should be gradually improved.

Turn experience into clear requirements.

Field experience can be documented through tooling diagrams, procedure descriptions, and key inspection points. For example, directions that are easily confused can be illustrated using schematic diagrams. Process documents should allow personnel with the appropriate skills to perform the tasks repeatedly, rather than relying on individual verbal instructions.

How to evaluate the impact of changes.

When equipment, materials, or connection methods change, it’s necessary to re-evaluate the affected features and verification items. Changes should be evaluated to determine which existing evidence remains valid and which needs to be supplemented. Only in this way can process optimization remain continuously aligned with product requirements.

Process example: Turning first-piece issues into process improvements

Assuming that the dimensions of the first batch meet the requirements, there may be several adjustments needed during the manufacturing process to complete the measurements. If the trial production is deemed successful based solely on the final results, it’s possible that some issues related to repeated manufacturing processes might be overlooked. It’s important to record the steps, reasons for adjustments, and necessary conditions, then improve the tooling or documentation accordingly. The second round of verification should not only focus on the final product, but also on whether these temporary adjustments have reduced errors, thereby indicating that the process has truly stabilized.

Common question: Does successful trial production mean that the mass production process is stable?

The trial production indicates that certain assumptions about the process are valid under the given conditions. During mass production, attention should also be paid to repeatability, changes in resources, and fluctuations in the process. One successful part alone cannot indicate long-term stability.

Key points for verification during implementation

• Correspondence between features and processes.
• Record issues encountered during trial production.
• Experience has been documented.
• Change validation is thorough.

Process standardization doesn’t mean that no further adjustments will be made. Any changes involving materials, equipment, or critical conditions should be re-evaluated for their impact.