Quality Control for Steering Column Switches & Power Window Switches

Raw materials selection

Main housing: PA66 with glass fiber, good heat resistance and mechanical strength; POM for internal moving parts, excellent wear resistance.
Contact parts: silver alloy, stable conductivity and anti-oxidation.
Rubber seals: EPDM, good waterproof and ageing resistance.
Preferred materials: flame-retardant reinforced PA66 and silver cadmium-free alloy contacts to meet automotive standards.
1. Key production process details & quality control
Injection molding: Control molding temperature and cycle time to avoid shrinkage, warpage and surface defects of plastic housings.
Component assembly: Prevent foreign matter inside switches; ensure correct positioning of springs, contacts and PCBA; avoid mis-assembly or loose parts.
Soldering process: Control soldering temperature to prevent cold solder joints, short circuit or damage to circuit boards.
Waterproof & dust-proof assembly: Guarantee proper fitting of sealing rubber, no gap at joint surfaces.
1. Inspection equipment for quality verification
Electrical tester: Test continuity, resistance, over-current performance and short circuit protection.
Life test machine: Simulate repeated pressing to verify switch operation lifespan.
Environmental test chamber: Conduct high/low temperature, humidity and thermal cycling tests.
IP waterproof & dustproof test equipment.
Force-displacement tester: Check hand feel and actuation force of buttons.
Salt spray tester: Assess corrosion resistance of metal contacts.
1. Final finished product check
Visual inspection for scratches, burrs and marking defects.
Full function test for each switch gear.
Packaging protection to avoid scratches and damage during transportation.

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