Rationalization analysis of pressure spring of oil machine

SN/mmZr: 23.SN/mmZå…€U When the number of load cycles is N10, the r.Ac line is the maximum stress line and is the torsional yield limit. From the origin, r-i. is used as the ray, and the point E on the line is the working stress point of the spring, and the intersection with the AC line at the point G is the limit stress point of the asymmetric cycle.

It can be seen that the ultimate stress of the projectile is obtained from the similar triangle â–³AGH and â–³CGF. S: a maximum stress distribution of 13.85 is 723.5, 13. The stress of the asymmetric stress spring is the asymmetric cyclic stress, and the cycle characteristic is Food one 07238 is a constant.

The limit of the asymmetry cycle should be persuasion, and the maximum stress value of the asymmetry cycle characteristic r. The ultimate stress rlim of the asymmetric cycle can be determined by the God-man limit stress diagram. The 1079N/mmZC point is the material torsion strength r, generally a few, and the OC line is 45 degrees from the abscissa. It is the minimum stress line. Because the minimum stress and the maximum stress are equal on this line, it is called the static stress line. Point A on the vertical axis is the material pulse fatigue limit, then: 2 = 506.6 N / mmZ set the coefficient of variation of the ultimate stress 与 and the coefficient of variation of the material strength.

The same, the standard deviation of the asymmetry cycle ultimate stress is calculated by the following formula: S: u0.014, then Sr two 12.293. The life rate of the bomb praise When the material strength and the working stress are both normal distribution, the reliability coefficient is In the actual manufacture of springs, in order to improve the fatigue strength of the material, shot peening and strong pressure treatment are adopted. The diameter of the shot peening is generally between 0.75 and 1.omm, generally 0.smm, and the shot peening is generally made of steel. At the time of the projectile, the speed of the projectile is 50-84 m/s, and the fatigue strength of the spring after shot peening is somewhat improved.

Strong pressure treatment of the appropriate spring, under the same working conditions, the strength of the spring can be increased by 535%. The data shows that the spring treated by shot peening and strong pressure process, take the fatigue strengthening coefficient k 1.3, then set a k by Z table It can be seen that the reliability R>0.999999 is unreliable F1-R<1Xl) The reliability safety factor n is 7:2 21.25 From the above calculation, the design and material of the injector pressure regulating spring are reliable.

The flow area is detrimental to the dynamic sealing of the hydrodynamic valve 1. Therefore, the lift of the valve and the sealing hydraulic power have a tendency to cause the valve to close, so its taper angle must be properly matched to ensure that good dynamic characteristics are factors that affect the dynamic response time. However, at the same time as the hydraulic power, rapid discharge is achieved. The size is related to various factors, such as the valve core structure, the overcurrent area, the input voltage is appropriately increased, and the winding windings are reasonably reduced.

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