In the process specification and fixture design of eccentric shaft, according to the production batch and actual production situation, the process arrangement should adopt the method of combining centralized process and decentralized process, and design an automatic production line. When organizing processes according to the principle of process concentration, efficient machine tools and high degree of automation technology and equipment are also used. This can greatly improve the production efficiency.
2. The specific method of machining eccentric shaft with three-jaw chuck is as follows:
When machining eccentric workpieces with three-jaw self-centering chuck, when machining eccentric workpieces with small eccentricity (e≤5-6 mm), short length and large quantity, the excircle and length can be turned in the three-jaw self-centering chuck first. Then clamp it on the three-jaw chuck, and pad a gasket on one of the jaws to make the workpiece eccentric for turning. The thickness of the pad can be calculated by the following formula.
X= 1.5e×( 1-e/2d)？
X= gasket thickness; E= eccentricity of the workpiece; D= the diameter of the three-jaw clamping part. In actual turning, due to the deviation of the contact position between the long claw and the workpiece, the deformation of the soil clamping pad needs a correction constant.
X real number =x+ 1.5△e
X real = actual gasket thickness; X= calculated thickness; △ e= eccentricity error measured after the test.
Extended data:
Function of eccentric shaft
In mechanical transmission, rotating motion becomes reciprocating linear motion or reciprocating linear motion becomes rotating motion, which is generally completed by eccentric parts. In order to adjust the center distance between shafts conveniently, the V-belt drive of planar linkage usually adopts eccentric shaft. The general shaft can only drive the workpiece to rotate, while the eccentric shaft can not only transmit rotation, but also transmit revolution.
Structure and working principle of eccentric shaft
When the circle does not rotate around its center, the eccentric shaft becomes an eccentric wheel. Eccentric shaft is also a kind of cam. Generally speaking, the main purpose of eccentric wheel is to produce vibration. For example, the vibrator in a mobile phone is an eccentric wheel, and most eccentric wheels are round wheels, because round wheels are convenient to manufacture and simple in technology.
References:
Baidu encyclopedia-eccentric shaft