Crankshafts are an engine’s heart and can be the most important and stressed portion of the rotating assembly. So they need to be precision pieces in addition to needing to be solid. The scale and roundness of the main and rod journals not only need to be precision machined, but the position of those journals, which are offset from the rotation axis, needs to be completely fine.
Crankshaft Machining Combines Speed And Precision
If a rod journal’s position is off on one axis, you adjust the duration of the stroke. If you’re off the other axis, the timing of the piston hitting the top dead centre is changed. Offset turning is no easy process for those of you who are not familiar with the use of a lathe, even though the devices in this video make it look like child’s play. These huge machines are responsible, in addition to the journal surfaces themselves, for all the fillets and chamfers in some very tight spaces, forming the counterweights in complicated shapes, along with finding and drilling oil passages.
These devices can also finish-polish each journal independently of the others, with the advancement of technology and hardware, a job that typically requires a human touch. One of the completely coolest features is a technology that we didn’t even know existed: individual journals’ induction hardening (and built-in-quenching).
Perhaps by keeping the extreme heat confined to the particular journal, and by mitigating any distortion in the form of the crankshaft in the order in which individual journals are heated and quenched.
There is only the sheer elegance of the mechanical dance performed by the numerous clamps, probes, drills, and machining tools, in addition to all the technical marvels involved in these automated crankshaft manufacturing devices, as they convert steel into thin shavings and turn a single cast or forged hunk of metal into a precision piece of automotive equipment. So just sit back and enjoy your show.
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