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Dongguan Goodjob Precision Components Co.,Ltd.

ADD: No.68, Changsheng North Road, Dalang,Dongguan,Guangdong,China

Tel: +86-769-23327726

Fax: +86-769-23327736

Email:info@goodjcnc.com

How to inspect precision components
Jun 20, 2018

For small batch production of one part,the dimensional precision always used outside micrometer to inspect.For large quantity production,we always use plain limit gauge to inspect.For these components with long length and high precision,we can use comparator to inspect.We can use roughness sample plate to inspect the surface roughness.If there is high requirement of the surface roughness,we can use optical microscope or contourgraph to check.The deviation from circular form can use micrometer to measure the half max difference value of the workpiece’s diameter on the same cross section.It can also use micrometer with V shape iron to measure.It can use roundness measuring equipment to inspect if it is possible.The deviation from cylindrical form can use micrometer to measure the difference between the max and min dimension of the same axial section to inspect.The inspection of mutual positional precision of main shaft always using the center hole on both ends of the shaft as datum reference,measuring with micrometer gauge on both bearing journal.

After machining,the precision components should be inspected to ensure if it is a qualified componnets.But the features of precision components is that the components always are very complex and precise.So we should inspect them again and again to select the unqualified parts.Then how does the QA to inspect these precision components?

 

For small batch production of one part,the dimensional precision always used outside micrometer to inspect.For large quantity production,we always use plain limit gauge to inspect.For these components with long length and high precision,we can use comparator to inspect.We can use roughness sample plate to inspect the surface roughness.If there is high requirement of the surface roughness,we can use optical microscope or contourgraph to check.The deviation from circular form can use micrometer to measure the half max difference value of the workpiece’s diameter on the same cross section.It can also use micrometer with V shape iron to measure.It can use roundness measuring equipment to inspect if it is possible.The deviation from cylindrical form can use micrometer to measure the difference between the max and min dimension of the same axial section to inspect.The inspection of mutual positional precision of main shaft always using the center hole on both ends of the shaft as datum reference,measuring with micrometer gauge on both bearing journal.

During the process of precision machining,there are many reasons which caused the machining error.But the most important influence factor is the radial run-out error of tools when machining.It will affect the precision of whole machining process.How do we handle this error?

1.       The cutting depth should be reasonable

If the cutting depth is too small,it will slip when machining,thus cause the tool’s radial run-out constant change.It will lead a result that the machining surface is not smooth.If the cutting depth is too big,the cutting force will also increase and it’s easy to lead a deformation of the tools.The radial run-out will also increase and making the machining surface not smooth.

2.       Use up milling for finishing machining

When climb milling,the interstitial site between the screw and nut is changing and this will cause the feeding of workbench doesn’t symmetrical.This will then influence the machine,life of tools and surface roughness of workpiece because there will be shock and vibration.When up milling,the cutting thickness change from small to big,the loading of tools also change from small to big,the tools will be more steady when machining.But up milling will only used for finishing machining.For rough machining,we should use climb milling to improve the efficiency and the using life of tools.

3.       Fair use the cutting fluid

Water solution used for cooling have little influence of the cutting force.But the cutting oil used for lubrication action can reduce the cutting force observably.Because of its lubrication action,it can reduce the friction between the smear metal with rake face of tools and the workpiece with the flank face of tools.And then reduce the radial run-out.