The process of Machining and Assembly of Engine
刘洋 Liu Yang
The Main Part of Engine
(1) Cylinder block(2) Cylinder head (3) Connecting rod(4) crank shaft(5) Camshaft
So, how to make these parts? That’s talk about it.
Cylinder BlockMaterial: gray cast iron, alloy cast iron, aluminum alloy, vermicular
cast iron and so on.Method of processing :(1) The processing of big plain: first, simple milling and then, accurate milling.(2) The processing of the bearing hole of the main shaft:
accurate boring using the multi-knife and the pull boring bar. The hole should be finished at only one time in order to make sure the vertical degree of the hole and thrust plain.
(3) The processing of the cylinder hole: simple boring, semi- accurate boring, accurate boring.
Material: gray cast iron, alloy cast iron, aluminum alloyMethod of processing: Since the requirement of accuracy is very high, and
take the difficulty into consideration, today, the company using the machining center manufacturing technology, manufacturing technology and other agile production line manufacturing technology to produce the cylinder head.
Connecting rodMaterial: medium carbon steel, medium carbon alloy steel, powder
metallurgy, high-strength aluminum alloy and so on.Method of processing: (1) Blank: using the CAD\CAM technology to make the high quality
mould in order to maintain the high accuracy at the weight and the thickness of the blank. Then cast.
(2) Mechanical processing: first, take the processing on the end edge, using the
methods of grinding. Then treating the surface of combination. Finally, processing on the holes of the big edge and the small edge, using the methods of drilling and boring.
Material: Nodular cast iron, alloy steel.Method of processing: first, casting the blank. After the heat
treatment, we have to mill the two ends. Then, drill the center hole of the main shaft. After that, lathe the main journal and drill them. Finally, check the crank shaft.
Material: nodular cast iron, alloy cast iron, chilled cast
iron, medium carbon steel, alloys steel.Method of processing: milling the end edge, lathing the main
journal, heat treatment, check, and then grind the cam and the journal.
The process of Assembly
Before the assembly: we should pay attention to the following
points:(1) All the parts should be checked and conform to
the requirement.(2) All the parts should be cleaned and dried.(3) The part cannot be exchanged.(4) All the parts should be assembled correctly
according to the assembly drawing.
The installation process (1) Install the cylinder (2) Install the crack shaft and the flywheels(3) Install the pistons and the connecting rod(4) Install the parts of the valve (5) Install the camshaft(6) Install the cylinder head(7) Install other parts, such as the pipe, the pump
and the belt.