innovative process
The challenge
The principal technical challenge of this project was to satisfy the exceptionally stringent industrial specifications and precision manufacturing requirements imposed by European customers for carbon fiber plates. In sectors such as aerospace, medical devices, and premium automotive engineering, compliance with ISO and ASTM standards is mandatory—particularly regarding laminate porosity (<1%), resin distribution homogeneity, and dimensional accuracy (typically ±5–10 µm for critical features). Furthermore, customer-supplied engineering drawings specified intricate non-orthogonal contours, multi-axis hole patterns, and tight positional tolerances—requirements that render conventional machining methods highly susceptible to edge chipping, interlaminar delamination, and thermal-induced matrix degradation. Consequently, achieving zero-defect production while maintaining throughput and process repeatability constituted Sunnix’s foremost engineering objective.
project goals
This initiative aimed to deliver a certified batch of custom-engineered carbon fiber composite components meeting both functional performance and regulatory traceability requirements for the European market. Key objectives were threefold: (i) to implement an integrated, validated machining strategy—combining high-dynamic five-axis CNC milling with abrasive waterjet cutting—to guarantee burr-free edges and dimensional conformity within ±0.05 mm across all critical features; (ii) to develop and qualify a tailored autoclave curing cycle and post-cure stabilization protocol for the customer-specified high-modulus carbon fiber prepreg system, ensuring full compliance with EN 2562 for tensile strength (≥2,800 MPa), flexural modulus (≥220 GPa), and interlaminar shear strength; and (iii) to execute end-to-end project delivery—including raw material sourcing, layup, vacuum-bagging, cure, non-destructive evaluation, precision finishing, and metrological verification—within a six-week timeline, accompanied by EN 10204 Type 3.1 material test reports with full lot traceability.
the result
Sunnix resolved thin-laminate drilling-induced delamination through the deployment of a high-rigidity five-axis machining center equipped with application-specific diamond-coated carbide tools and adaptive feed-rate control. All machined surfaces achieved a consistent surface roughness of Ra ≤ 1.6 µm, verified via contact profilometry. Third-party ultrasonic C-scan inspection confirmed volumetric integrity, with measured void content averaging 0.7%—well below the EN 2562 upper limit of 1.0%. Mechanical testing further validated full conformance to EN 2562 mechanical property thresholds. The order was delivered on schedule, with full documentation package accepted without reservation. As a direct outcome, Sunnix secured a multi-year framework agreement with the customer—affirming its capability to deliver internationally benchmarked, mission-critical composite components and positioning the company as a qualified Tier-2 supplier within European aerospace and advanced mobility supply chains.
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