There are many factors that affect the accuracy of metal processing. Machine quality, material selection, and even room temperature can all play a role, and some customers may have very different accuracy requirements than others.
What Is Accuracy?
Machining accuracy usually includes dimensional accuracy, shape accuracy and positional accuracy, etc.
1. Dimensional Accuracy
The extent to which the actual size of a machined part conforms to the center of the tolerance band of the part size.
2. Shape Accuracy
It refers to the degree of conformity between the actual geometric shape of the surface of the machined part and the ideal geometric shape.
3. Positional Accuracy
Refers to the actual positional accuracy difference between the relevant surfaces of the machined part.
4. Interrelationship
Usually in the design of machine parts and parts machining accuracy, should pay attention to the shape error control in the position tolerance, position error should be less than the size tolerance. That is, precision parts or parts of the important surface, its shape accuracy requirements should be higher than the positional accuracy requirements, positional accuracy requirements should be higher than the size accuracy requirements.
Factors To Affect Precision Machining Accuracy
According to our many years of experience in machining, there are main 10 points affect machining accuracy:
(1) Spindle rotation error, machine tool spindle runout accuracy to a certain extent.
(2) Guideway error, the precision of the guideway in the machine tool and lead to errors in the shape of the workpiece.
(3) Transmission chain error, including gears, nuts, worm gears, screws and other transmission components. Influence the workpiece surface machining accuracy of the error factors, the main factor is the machine tool transmission chain error.
(4) Tool, fixture error, the different types of tools, the degree of impact on the machining accuracy is also different.
(5) The cutting process caused by changes in the location of the force point, resulting in differences in the deformation of the system, so that the machined surface to produce shape errors.
(6) The machining error caused by the change of cutting force size.
(7) process system heat deformation caused by the error, machining process, the process system will be in a variety of heat sources under the action of certain thermal deformation.
(8) Thermal deformation of machine tools.
(9) Tool thermal deformation.
(10) Workpiece thermal deformation, workpiece thermal deformation is mainly caused by cutting heat.
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