Cause of error in machining and manufacturing of mechanical parts
Publish Time: 2016-07-04 Origin: Site
In the world there is no perfect things, machinery parts manufacturing is the same, more or less will have a certain error, then the resulting error reason is what you do? Here we come to see.
1, The force deformation error
Process system will be deformed under the action of the cutting force, clamping force, gravity and inertia force, which has been adjusted to a good process of each part of the system of the mutual position relation is destroyed, the machining error also produced, the stability of machining process will therefore receive the impact.
2, Processing principle error
The machining principle error is the error that is produced by using the approximation of the edge profile or the approximation of the transmission. For example, used in the machining of involute gear hob, in order to facilitate the hob manufacturing, Archimedes worm or method to straight profile of basic worm instead of involute basic worm this method can be used, the gear involute error occurs. And such as turning module worm, because of the worm gear circular pitch is equal to that of the worm pitch (i.e. m PI), where m is the modulus, and PI is belongs to the irrational number, but the lathe change gear tooth number is limited, the Pi of for approximate numerical (PI) =3.1415 calculation in choosing the distribution change gear, it will cause tool motion inaccuracy caused by pitch error.
3,Geometric error
Due to the actual geometric parameters and position of the components in the process system, the error caused by the deviation from the ideal geometric parameters and position is compared. The geometric elements of the process system affect the geometric error of the system.
4, Thermal error
In the process of machining, cutting heat, friction heat and the influence of heat source around the working area, the process system can produce complex changes in temperature. Under the influence of the interaction of various heat sources, the process system will receive the influence of deformation, resulting in the correct relative position of each component to change, thereby causing the production of processing errors.
5, The stress caused by the workpiece machining error
Internal stress is the error factor of the workpiece itself. Internal stress is produced after the construction of cold and hot processing. Under normal conditions, the state of equilibrium is a normal stress, but when the workpiece is processed, the original internal stress balance state of the workpiece with internal force is destroyed, and then to promote the deformation of the workpiece.
6, Measurement error
In the production process of the workpiece, the error caused by the measuring method, measuring accuracy and other factors on the accuracy of the measurement results is referred to as the measuring error.
The above is the mechanical parts in the processing of some of the causes of error, hope to be able to help in the production of.