Cylinder Head Construction
According to Karyanto E (1993) Cylinder head is the main part of the motor that serves to close the cylinder liner and the injector installation place and the housing of the valve. The construction of the cylinder head is as follows
- there are holes for engine cooling water lines
- there is a cavity for the combustion chamber
- There are holes for the position of the atomizer nozzle
- there are holes for the intake and exhaust valves and valve mechanics
- there is a hole to place the engine fastening bolts
- the position of the engine transport hook
The cylinder head is shaped in such a way based on several factors. For example, weight factor, form factor, surface form factor, and easy-to-handle factor. The shape of the cylinder head is sometimes square or round, equipped with tap bolts (journals) and several holes for valves and manifold pipes. The tap bolts serve as a place to lift the cylinder head during disassembly. The valves on the cylinder head are a way for clean air to enter and exhaust gases from combustion.
Cylinder Head Composition Material
According to the instruction manual, the cylinder head is made of cast steel from an alloy of pure iron with carbon by 0.3%-0.6%, allowing the steel to be partially hardened by appropriate heat treatment (head treatment), the hot working process increases the strength of the steel by a heat treatment process. which heats the material to a certain temperature and then cools it in a certain way. During the casting process, the steel is heated to a high temperature (±15000 C) and then poured into a mold under pressure.
Material Fatigue
Fatigue is a limit to the allowable metal stress. Fatigue figures of a metal material are not the same, this is caused by the manufacturer and adjusted according to their respective needs and uses in addition to a long service life, the stress received by the material continuously and the temperature fluctuating can reduce the strength of the material so that cracking can occur.
When steel is heated at temperatures above 5000 C there will be a release of a small part of the stress that is in the steel, it causes a slight decrease in the hardness and strength of the steel. Cracks are lines formed on a hard object such as metal as a result of the decrease in hardness and resistance by deformation. Deformation is a change in size or shape due to the influence of the load imposed on it and has a high strain speed, the material will generally experience cracks due to the material being subjected to a sudden load. This deformation can occur elastically and plastically.
Elastic deformation, which is a change that immediately disappears again when the load is removed. Plastic deformation, which is a change in shape that persists even though the load that causes deformation is removed. To avoid this, the provision of the right cooling temperature or temperature will help reduce material fatigue.
silahkan berkomentar secara bijak dan sesuai dengan topik pembahasan. TERIMAKASI