TIANMI Product Line & Factory Tour

What the video shows, and why each stage matters

The overview video walks through sensor and relay production, from incoming material through the line to final test. This page explains what each stage is for, so that a buyer can judge the process rather than only watch it.

Surface-mount assembly (SMT)

SMT is where the control electronics of a sensor are built. What matters is not the machine but the control around it: solder-paste volume, reflow profile and placement accuracy together determine whether a board survives thermal cycling in an engine bay. Look for in-line inspection at this stage — optical inspection immediately after reflow catches defects while the board is still reworkable, rather than after the unit has been potted and sealed.

Coil winding

Relay coils and sensor windings are wound to a target resistance and turn count. The risk at this stage is variation: a coil slightly outside specification may still pull in when new, and only reveal itself later at low temperature or low supply voltage. Winding tension and turn count are therefore controlled and sampled, not merely counted.

Moulding and sealing

Automotive electrical parts live in an environment of moisture, salt, vibration and temperature cycling. The housing and the sealing system — not the electronics — usually decide whether a part survives five years in service. Moulding consistency, insert placement and the potting or gasketing process matter more than they appear to on a factory walk-through.

Three kinds of testing, three different purposes

In-line testing verifies each unit against its functional specification before it leaves the line. Environmental and lifecycle testing — temperature cycling, humidity, vibration, endurance switching — establishes that the design survives the conditions it will actually meet, and is carried out on samples rather than on every unit. EMC testing confirms that the part neither emits nor is disturbed by electromagnetic interference, which matters increasingly as vehicles carry more electronics.

Assembly and model changeover

Automated relay assembly gives a stable cycle time and repeatable adjustment, and it also turns model changeover into a documented process rather than a manual one. For a buyer, the practical benefit is consistency between batches: the fifth shipment should perform like the first.

What to look for when you audit a supplier

Equipment is easy to photograph and hard to judge. More informative questions: which characteristics are controlled in production, and how often are they sampled? What happens to a unit that fails in-line test? How is test data retained, and can it be retrieved for a specific batch? Who signs off a change in process or material?

Scope

This page is a general explanation of production stages for automotive electrical components, written to help buyers interpret what they see in a factory or in a video. It is not a specification of our equipment list or capacity, and specific capability claims should be confirmed with us in writing for any given programme.