Quality Control

Changdong uses a universal tensile testing machine to verify the mechanical properties of raw materials used in stamping projects. Tensile testing helps our team understand how the material will perform during forming, bending, drawing, and other stamping operations before or during production validation.
For projects with material performance requirements, tensile testing provides useful data for engineering review, sample validation, and quality control. The test results can support the evaluation of tensile strength, yield strength, elongation, elastic modulus, and other related material properties.
This testing method is especially useful for projects where forming behavior, cracking risk, springback tendency, or material consistency may affect tooling performance and stamped part quality. By checking material data in advance, Changdong can support more reliable die development, tryout review, and production control.
Typical Test Items: Tensile strength, Yield strength, Elongation, Elastic modulus, Maximum force, Material performance consistency

Changdong uses CMM inspection to verify key dimensions, hole positions, surface profiles, trim edges, and geometric features of stamped parts and tooling components. CMM measurement provides structured dimensional data for sample review, die correction, and final confirmation.
During die tryout and sample validation, CMM reports help the team compare actual part measurements with customer drawings and inspection requirements. If dimensional deviation, hole position issues, surface profile variation, or trim edge problems are found, the inspection result can be shared with the tooling, tryout, and engineering teams for adjustment.
CMM inspection is especially useful for formed metal parts, automotive stamped components, prototype samples, and parts requiring clear dimensional records before customer approval or shipment.
Typical Inspection Items: Key dimensions, Hole position, Surface profile, Trim edge condition, Part geometry, Formed areas, Tooling component dimensions, Dimensional deviation review

Changdong uses 2D projector inspection to measure flat features, hole positions, slots, contours, profiles, edge conditions, and small stamped metal components according to customer drawings and inspection requirements.
Compared with general hand measuring tools, a 2D projector allows the quality team to review part outlines, hole locations, profile shapes, and dimensional relationships more clearly. It is suitable for stamped parts, tooling components, samples, and flat features that require optical measurement and visual comparison.
During sample review or production inspection, 2D projector results can help identify hole deviation, edge variation, contour mismatch, burr-related influence, or profile issues. If a dimensional issue is found, the result can be shared with the tooling, tryout, stamping, and quality teams for further review or correction.

Typical Inspection Items: Hole position, Slot position, Part contour, Profile shape, Edge condition, Flat features, Small stamped components, Tooling component profiles

Changdong uses a 3D optical scanner to capture full-surface geometry of stamped parts and compare the scanned data with the original 3D CAD model or inspection requirements.
This method is suitable for formed metal parts, prototype samples, complex stamped components, and parts with curved surfaces or springback risk. Compared with single-point measurement, 3D optical scanner inspection provides a more complete view of part shape, surface deviation, deformation, and forming consistency.
During die tryout and sample review, scanning results can help identify springback, surface variation, forming deviation, twisting, local deformation, or mismatch between the stamped sample and the designed model. The inspection data can then be used by the tooling, tryout, engineering, and quality teams for die correction or process adjustment.

Typical Inspection Items: Full-surface geometry, Surface deviation, Springback review, Forming condition, Part deformation, Prototype sample validation, Comparison with 3D CAD data, Die correction feedback

Changdong uses checking fixtures to validate stamped part positioning, hole alignment, edge condition, forming areas, and assembly-related features according to customer drawings and project requirements.
During sample review and final confirmation, the stamped part is placed onto the checking fixture to verify whether it can be located correctly and consistently. This helps the quality team check locating points, datum areas, holes, slots, trim edges, formed surfaces, and key functional areas in a practical inspection condition.
Checking fixture validation is especially useful for automotive stamped parts, appliance components, structural brackets, and parts that need to match other assemblies. It helps confirm whether the stamped part meets dimensional and functional requirements before customer approval or production release.

Typical Validation Items: Part positioning, Datum and locating points, Hole and slot alignment, Trim edge condition, Forming area fit, Assembly-related features, Repeatability and consistency, Sample approval support