Car Door Lock Assembly: Latch Cycle Test

How a car door lock line is specified

The lock type (manual, central locking or with a key cylinder), the actuator, and the latch force the customer accepts decide the line. A lock is judged by feel as much as by function, so the line needs a force curve, not just a go/no-go.

Station sequence

Housing feeding, spring and lever placement, actuator fitting, then a latch cycle test that records open and close force. Springs are the hardest part to feed reliably, and the orientation of a spring decides whether the station jams.

What decides reject rate

• Spring preload: a spring fitted one turn short still latches, and rattles a month later.
• Lever interference: a lever that rubs the housing passes a bench test and stiffens in the door.
• Grease: the wrong amount changes the force curve more than any tolerance.
• Cycle count: testing one cycle proves nothing. A short run of repeated cycles catches the parts that fail early.

What we need from you

• Lock drawing with the spring and lever positions
• Actuator specification and the key cylinder, if used
• The force window for open and close, and how it is measured
• Output per shift and the variants sharing the line

How the project runs

Quote from drawing, tooling design, build, then run-off with your own parts in our plant in Chashan. Machines are built to your samples and drawings, and the drawing set is agreed before metal is cut.

Send a drawing to [email protected] or call +86-18123647785 to start a quote. Related lines: curtain pulley assembly machines, bearing assembly machines.