In order to ensure the normal operation of the engine, the spring force of the valve spring should be greater than the reciprocating inertia force of the gas distribution system. During the movement of the valve train, the harmonics of the cam lift curve cause the valve system to vibrate, and the valve spring is also in a continuous vibration. During the working process of the engine, with the change of the crankshaft speed, the harmonic resonance of the cam lift produces a periodic peak with high amplitude. The valve spring resonance is caused by the internal stress of the spring material changing with the rotational speed of the crankshaft. Increasingly, the spring payload also periodically changes during valve movement, and long-term motion changes cause the valve spring to be damaged.
In addition, the fatigue limit of the valve spring is also an important factor in the damage of the spring. It is affected by surface hardness and residual stress, and the inner surface is subjected to higher shear stress than the outer surface. According to the valve spring fatigue test, the fatigue failure of the spring starts from its inner side surface, especially the position with surface defects.
The factors that damage the spring are as follows:
a) defects of the material: the longitudinal crack is generated during the rolling process of the steel bar; the pitting and unstacking are the mechanical damage or scratch of the surface of the spring wire damaged during the manufacturing and quenching and tempering; the transverse crack is the steel wire Produced by the last process; non-metallic inclusions remain in the material during metal smelting.
b) Manufacturing defects of the spring: the use or disassembly of the workmanship in the manufacturing process, the fixture is not standardized, and the surface of the steel wire is damaged; the damaged pellet or the faulty equipment is used to make the shot peening insufficient.
c) Engine: Improper engine assembly, improper spring mounting and excessive rotation of the spring.
Material Grade: Aluminum Alloy 6000 series:6063,6061,6060,6005
Temper: T3-T8
Finish: Anodised, powder coated, sandblasting, electrophoresis ,titanium Powder
coating, Polish, Brushed, PVDF coating, wood-grained etc.
Color: Silvery white, black, golden, champagne, dark bronze or according to your requirement
Shape: Square, Round, Flat, according to customers' drawings
Thickness: Above 0.7mm,the thicker the better
Specification:
A. Length: ≤6.5m
B. Normal Wall thickness: ≥1.0mm
C. Normal Anodizing thickness: ≥8µm
D. Normal powder coating thickness: 60-120µm
E. Tensile strength: ≥160mpa
F. Yield strength: ≥110mpa
G. Extensibility: ≥8%
H. Hardness(HW): 8-15
Packing details: Kraft paper, EPE Fram, Shrink film, Composite paper or as your need
MOQ: 500kg
Delivery time: Normally20-25days for a 40ft container after we confirm your deposit.
Normal order sequence:
1. Confirm the drawings, colors and price
2. Pay the mould fee and we start to make moulds
3. We send samples to you for your confirmation
4. Make the payment of 30% deposit, start production
5. Delivery
Round Aluminium Pipe
Round Aluminum Pipe,Aluminum Round Pipe,Aluminum Round Tube,Aluminum Round Tubing
Zeyi Aluminum Co., Ltd. , http://www.zeyialuminum.com