The process method of center hole processing is introduced

Process method of center hole processing:

On the one hand, it ensures that the coaxiality error of the center hole axis at both ends of the parts is controlled within the tolerance range, and on the other hand, it ensures that the geometric shape error and surface roughness of the center hole conical surface are controlled within the allowable range, so as to improve the machining efficiency. The purpose of reducing the processing cost.

On the one hand, it ensures that the coaxiality error of the center hole axis at both ends of the parts is controlled within the tolerance range, and on the other hand, it ensures that the geometric shape error and surface roughness of the center hole conical surface are controlled within the allowable range, so as to improve the machining efficiency. The purpose of reducing the processing cost.

(1) the center drill is directly processed into a conical surface
(2) with cemented carbide laser conical surface
(3) Use a cast iron rod to round the cone
(4) Use the rubber wheel to round the cone
(5) Grinding conical surface with universal grinder
(6) The coaxiality of the axis of the center hole at both ends of the conical part grinding by the center hole grinder is ensured by the center hole machining, and the geometric shape and surface roughness of the center hole conical surface are also laid by the turning center hole machining, and the grinding of the center hole conical surface is an auxiliary method to improve the accuracy of the conical geometry and reduce the surface roughness.

There are 10 types of improved center holes commonly used, but the commonly used ones are international GB145-1985A center hole and B type. A type center hole is mainly used for parts processing, and the center hole is no longer used.

Type B center hole is mainly used for parts after processing, the center hole will continue to be used, so the 120 cone is to protect the 60 degree cone, in order to improve the process and processing accuracy.

Change the conical surface as shown in the picture, which will also protect 60 degrees. The 60 degree B center hole is machined by the 60 degree B center drill, so the length of L1 is determined by the center drill L1.

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