aluminum alloy castingThere will be errors,aluminum alloy castingThere are subjective and objective reasons for the error. Next, a brief discussion of objective reasons and solutions.

aluminum alloy castingThe error caused by objective reasons is mainly divided into three parts: CNC operating system error, mechanical error and tooling error.

1. CNC system error. According to the control method of the servo system,aluminum alloy castingThe system can be divided into open-loop control system, closed-loop control system and semi-closed-loop control system. The closed-loop control system can detect the actual position of the tool in real time, and feed back the result to the numerical control system, compare the feedback value with the command value in the system, and stop the movement until the difference is eliminated, so the control accuracy is very high.

aluminum alloy castingThe main method to reduce the above error is to improve the installation accuracy of the feedback system, and try to choose a feedback system with higher accuracy. There is a non-feedback link in the semi-closed loop control system, and the tool position accuracy will still be affected by the non-feedback link. The transmission chain error refers to the transmission chain.BeforeThe relative motion error between one and the latter transmission element is the effect.aluminum alloy castingThe main factor of accuracy can be compensated by modifying the parameters of the CNC system.

2Mechanical error.aluminum alloy castingThe mechanical part of the center includes reduction gears, support bearings, ball screws and couplings. There is a backlash in the drive screw. When the table moves in the reverse direction, this gap will cause the motor to run idle, and the table does not move, resulting in errors. ForAluminum alloy casting equipmentThe reverse clearance of the transmission, the method to eliminate the ball screw nut clearance is to apply a pre-tightening force; the extension of the cut-in and cut-out directions is introduced in the open-loop system to prevent undercutting or overcutting from affecting the processing quality of the parts; the closed-loop and semi-closed-loop The gap value measured in the system can be set as a compensation parameter for the reverse pitch error. caused by mechanical transmission chain deformation and thermal deformationaluminum alloy castingThe error can be solved by improving the quality of the machine tool parts, reducing the calorific value of the internal heat source, and strictly controlling the processing environment and use conditions.

3. Fixture error. The positioning error of the fixture will directly affectaluminum alloy castingThe dimensional accuracy and position accuracy of the workpiece, so the fixture is required to have good positioning accuracy, stiffness and structural manufacturability. Reasonable choice of the fixture fulcrum, positioning point and clamping point, to ensure that the deformation of the parts in the clamping within a reasonable range, otherwise the deformation will affect the machining accuracy of the parts. If the deformation of the part cannot be controlled by corresponding measures, the necessaryaluminum alloy castingProcess measures, such as heat treatment of parts, eliminate stress and reduce deformation; for deformation problems that cannot be solved by heat treatment, rough milling and fine milling can be separated, and rough milling and fine milling can use different clamping forces.