In the machining process, reasonable location relationship between tool and workpiece machining surface, surface machining precision can meet the processing requirements, otherwise will not be able to meet the processing requirements, the machining accuracy analysis is to analyze and research machining accuracy does not meet the requirements of various factors, namely the possibility of various original errors, and take effective technical measures to overcome, Thus improve the machining accuracy.

In machining, machine tool, fixture, workpiece and tool constitute a complete system, known as the process system. Due to the structure and state of the process system itself, the operation process and the physical and mechanical phenomena in the process of machining, the relative position between the tool and the workpiece is offset by various factors called the original error. It can also be amplified or reduced to reflect the workpiece, so that the workpiece processing error and affect the parts processing accuracy. Part of the original error is related to the cutting process. Part of the original error is related to the initial state of the process system itself. These two errors are also affected by environmental conditions, operator's technical level and other factors.

(1) The original error related to the initial state of the process system itself

① Principle error refers to the error existing in the principle of machining method.

(2) Geometrical error of process system

The relative position of the workpiece and the tool under the static error, such as the tool and fixture manufacturing error, adjustment error and installation error;

The relative position of the workpiece and the tool exists in the motion of the error, such as the spindle rotary motion error of the machine tool, the guiding error of the guide rail, the transmission error of the transmission chain.

(2) The original error related to the cutting process

(1) The deformation caused by the force effect of the process system, such as the error caused by the force deformation of the process system and the deformation caused by the generation and disappearance of the internal stress of the workpiece.

(2) Deformation caused by the thermal effect of the process system, such as the error caused by the thermal deformation of machine tools, tools and workpieces. In the machining process, reasonable location relationship between tool and workpiece machining surface, surface machining precision can meet the processing requirements, otherwise will not be able to meet the processing requirements, the machining accuracy analysis is to analyze and research machining accuracy does not meet the requirements of various factors, namely the possibility of various original errors, and take effective technical measures to overcome, Thus improve the machining accuracy.

 

 

In machining, machine tool, fixture, workpiece and tool constitute a complete system, known as the process system. Due to the structure and state of the process system itself, the operation process and the physical and mechanical phenomena in the process of machining, the relative position between the tool and the workpiece is offset by various factors called the original error. It can also be amplified or reduced to reflect the workpiece, so that the workpiece processing error and affect the parts processing accuracy. Part of the original error is related to the cutting process. Part of the original error is related to the initial state of the process system itself. These two errors are also affected by environmental conditions, operator's technical level and other factors.

(1) The original error related to the initial state of the process system itself

① Principle error refers to the error existing in the principle of machining method.

(2) Geometrical error of process system

The relative position of the workpiece and the tool under the static error, such as the tool and fixture manufacturing error, adjustment error and installation error;

The relative position of the workpiece and the tool exists in the motion of the error, such as the spindle rotary motion error of the machine tool, the guiding error of the guide rail, the transmission error of the transmission chain.

(2) The original error related to the cutting process

(1) The deformation caused by the force effect of the process system, such as the error caused by the force deformation of the process system and the deformation caused by the generation and disappearance of the internal stress of the workpiece.

(2) Deformation caused by the thermal effect of the process system, such as the error caused by the thermal deformation of machine tools, tools and workpieces.