Large machine tool castings

Large scale machine tool castings include machine tool bed,worktable,column,crossbeam,and gantry top connecting beam.The bed body castings have good shock absorption performance.The melting point is relatively low,the fluidity is good,and the shrinkage rate is small.

1.Large machine tool castings have good shock-absorbing properties.Due to the advantage of graphite in cast iron for lubrication and oil storage,it is beneficial.Similarly,due to the presence of graphite,its seismic resistance is superior to that of steel.

2.The casting process performance of large machine tools is good.Due to its high carbon content and close to eutectic composition,gray cast iron has a relatively low melting point,good fluidity,and low shrinkage rate,making it suitable for casting structurally complex or thin-walled castings.In addition,due to the tendency of graphite to form chips during cutting,the machinability of gray cast iron is better than that of steel.

How is the quality control of large machine tool castings?

In terms of defect control,casting quality management should prioritize preventing its occurrence and continuously research and solve various quality problems.We also need to conduct active market research,constantly grasp the quality requirements of consumers or users,and provide serious after-sales service to ensure market quality.Quality management is the sum of activities that integrate machine development,production inspection,and sales services.

The quality of castings determines the quality of each process flow.Controlling the quality of castings is actually full process control(TQC),which strictly controls the process without systematic errors(errors caused by abnormal reasons).The frequency distribution of random errors generated by random reasons during the process is regular.The basic method of quality control is to use mathematical statistical methods to distinguish between systematic errors and random errors in the casting process.This method is also known as Statistical Process Control(SPC)

The quality control of castings first depends on stabilizing the production process,avoiding the occurrence of systematic errors and the accumulation of random errors.Secondly,it is necessary to improve the accuracy of the process and reduce the range or dispersion of error frequency distribution.

There are many factors that affect quality,and another aspect of strengthening the intermediate inspection of the quality control station is to place all influencing factors under strict control.Any unqualified operation will occur before the casting is formed.