Integration of Metal Stamping and CNC Machining

Metal stamping is suitable for contour forming and preliminary structural processing of high-volume parts. It features fast forming speed and high material utilization. CNC machining is suitable for dimensional correction and functional secondary processing of critical areas, with high flexibility and precision control capabilities.
In the combined process, the sequence generally follows “pre-processing by stamping + precision finishing by CNC” to ensure that the preceding stamping process provides sufficient structural foundation, and that the subsequent CNC process can complete high-precision machining of critical dimensions, holes, or surface features based on defined datums.

Process Coordination Between Stamping and CNC

Division of Contour Forming and Precision Dimensions

Stamping completes the overall contour and structural forming of the part, while CNC handles positioning holes, threaded holes, assembly surfaces, etc., where tighter tolerances are required.

Auxiliary Realization of Complex Structures

For parts with local features such as inclined surfaces, steps, or grooves, the main structure can be completed by stamping first, and then supplemented by CNC machining for details that cannot be achieved by the die.

Multi-Datum Precision Control

Using the locating datums formed by stamping as the reference for CNC machining can reduce clamping errors and improve overall dimensional consistency.

Surface Quality Handling and Functional Enhancement

For products with high requirements for surface smoothness or geometric accuracy, CNC can serve as a secondary finishing method to meet decorative or functional standards.

Key Control Points in Process Integration

When implementing a combined stamping and CNC process, the following technical control factors should be noted:

The accuracy of the die and the tolerance design of the stamping process should be compatible with the machining allowance of the subsequent process, to avoid excessive CNC material removal and reduced efficiency.

Deformation and residual stress during stamping should be controlled. Intermediate annealing or straightening steps may be added if necessary to ensure the accuracy of subsequent processing.

Fixture design should accommodate the state of the part after stamping, to ensure stable clamping and datum consistency during CNC machining.

Unified measurement datums based on the process route should be established to ensure repeatability in dimensional inspection and data consistency between processes.

Process Advantages

Reduction of overall manufacturing cost

Increase in production rhythm and capacity

Improvement of assembly accuracy and structural reliability

Fulfillment of customized product demands for flexible processing