In post-injection molding operations, plastic parts often retain excess sprues (gates) that must be removed before final assembly. Traditional manual trimming is not only labor-intensive and slow but also carries a risk of surface scratches or structural damage. Meanwhile, components with stringent air-tightness requirements—such as pump housings, valve bodies, or fluid connectors—typically demand 100% leak testing. When sprue removal and leak testing are performed as separate, standalone processes, they frequently create production line imbalances, leading to bottlenecks, work-in-process accumulation, and reduced overall equipment effectiveness (OEE).

      To tackle this dual challenge, Ningbo Weibo Ultrasonic Automation Equipment Co., Ltd. has developed an integrated workstation that combines an ultrasonic sprue removal machine with a fully automatic leak tester in a single, synchronized cell:

• Controlled Sprue Breakage: The part is first positioned under a high-frequency ultrasonic horn. Precise vibration energy is applied to induce brittle fracture at the sprue base, cleanly detaching it without mechanical impact.
• Automated Transfer & Leak Testing: A robotic arm then transfers the trimmed part directly to the leak test station, where sealing integrity is verified using either differential pressure decay or mass flow measurement methods.
• Unified Control Architecture: The entire sequence—sprue removal, transfer, clamping, testing, and sorting—is orchestrated by a centralized PLC system, eliminating intermediate buffering and ensuring seamless cycle synchronization.

This integrated solution delivers two key benefits:

• Gentle, Consistent De-gating: Unlike manual prying or hammer-based methods, ultrasonic vibration enables controlled fracture, significantly reducing the risk of damaging the main part geometry or surface finish.
• Traceable Quality Assurance: Each leak test result—including pass/fail status, pressure curves, and cycle data—is automatically logged, enabling full quality traceability and supporting root-cause analysis in case of field failures.

      However, successful implementation depends on design-for-manufacturing (DFM) considerations. Specifically, the sprue base must incorporate a predefined fracture notch or shear groove to concentrate stress and ensure reliable breakage during vibration. Without this feature, energy dissipation may prevent clean separation, leading to incomplete removal or excessive force transmission to the part body.

      Ningbo Weibo strongly recommends involving process engineers during the early product development phase to evaluate and optimize gate design for compatibility with automated sprue removal. By embedding post-processing requirements into the initial mold and part design—such as gate location, thickness, and fracture geometry—manufacturers can unlock significant gains in throughput, yield, and automation readiness.

      In conclusion, the integration of ultrasonic sprue removal and automated leak testing represents a strategic step toward lean, intelligent manufacturing. It not only resolves critical efficiency and quality bottlenecks in post-molding operations but also lays the groundwork for fully connected, data-driven production lines in high-precision plastic component manufacturing.