Background and Problem

A Malaysian tier‑1 supplier producing automotive temperature and pressure sensors needed to convert a manual potting and thermal‑gap‑filling step to an automated cell. Operators applying thermally conductive glue by syringe produced inconsistent bead volume and weight, causing variable thermal transfer, part failures in thermal cycling, and significant rework. The customer required a solution that could integrate with existing robot arms, deliver repeatable per‑shot mass control, and support higher throughput with reduced material waste.

Cause

Primary failure modes were operator variability in squeeze pressure and dispense time, air entrainment and inconsistent paste supply from pressure pots, and lack of closed‑loop control for per‑part glue mass. These issues led to under‑ or over‑apply, inconsistent thermal paths between sensor die and housing, and increased scrap and customer complaints during vehicle qualification testing.

Solution — KSV3000 Concentric Auger Valve

Integrated with Robot Cell Mingseal supplied the KSV3000 concentric auger valve (wear‑resistant model) and integrated it onto the customer’s six‑axis robot end‑effector to replace manual dispensing. The KSV3000’s positive displacement screw metering and motor‑driven pulse control solved the core metering problems while enabling fast cycle rates required by the automotive takt.

Key Implementation Details

• Positive displacement metering: The concentric auger design produces linear flow proportional to motor rpm, eliminating pressure‑pulse artifacts that plague pneumatic systems. Each timed motor pulse yields a fixed volumetric shot, giving tight control of glue weight per part.
• High‑speed capability: The KSV3000 supports up to 500 rpm, enabling short pulse durations for small, repeatable deposits while matching robot motion speed for in‑motion dispensing and higher UPH.
• Wear‑resistant wet path: Selected wetted materials resist abrasive, filler‑loaded thermal pastes and minimize clearance changes over long runs—reducing drift and maintenance frequency.
• Compact head for robot mounting: The small footprint and quick‑change nozzle interface simplified end‑effector design and allowed fast nozzle swaps for different sensor families.
• Process tuning and validation: Mingseal performed bench characterization to determine rpm, pulse time, and nozzle diameter for each thermal‑paste formulation and pad geometry. Encoder feedback on motor pulses was used to guarantee shot repeatability.

Integration and Process

Flow The cell was configured with robot pick‑and‑place, KSV3000 mounted on the wrist, and a heated, agitated feed pot with controlled pressure to maintain paste conditioning. Typical flow: robot aligns over sensor housing using vision fiducials, performs in‑motion bead or dot dispensing following the programmed path, and the part is weighed on a microbalance sample station at regular intervals. If mass drifts beyond SPC limits, the system triggers a purge, auto‑recalibration, or stops for maintenance.

Results and Benefits (Malaysian Deployment)

• Controlled glue mass: Per‑shot variance fell below targeted tolerance, eliminating under‑fills and excessive squeeze‑out; weight control reduced thermal performance variance across lots.
• Yield and quality improvement: Automated metering and closed‑loop sampling reduced rework and scrap—enabling more consistent thermal test pass rates and lowering warranty risk.
• Throughput uplift: Robot‑mounted KSV3000 supported continuous, high‑speed dispensing cycles, increasing UPH versus manual lines while maintaining precision.
• Reduced material waste: Positive displacement metering and tuned nozzle selection minimized over‑apply and cleaning frequency, lowering material cost per unit.
• Lower maintenance and predictable uptime: The short fluid path and wear‑resistant components reduced clogging; quick nozzle changes and scheduled purge cycles simplified preventive maintenance.

Recommendations and Best Practices

• Run a material characterization test to define rpm/pulse maps for each paste lot.
• Use encoder feedback and periodic microbalance checks for closed‑loop mass control.
• Implement purge and nozzle‑change SOPs based on shot counts for automotive traceability.

Conclusion 

For Malaysian automotive sensor manufacturers, the KSV3000 concentric auger valve offers a robust path from manual dispensing to automated, robot‑mounted metering. Its mechanical positive displacement, high rpm capability, and wear‑resistant design deliver repeatable glue weight control, higher throughput, reduced waste, and improved thermal performance consistency—supporting scale‑up for demanding automotive production. Contact Mingseal for on‑site trials and process qualification with your thermal paste.