What measures can be taken to ensure the processing quality of drilling holes that occupy a large proportion in CNC precision processing plants
Drilling is a basic method of hole processing, which occupies a large proportion in Shenzhen CNC precision processing plant. The tools used for drilling are shoulder drills and fried dough twist drills, which can process holes on solid materials.
Due to the large cutting load, poor tool stiffness and the shortcomings of the drill structure during drilling.
When drilling, the following problems often occur: the drill is easy to deflect, causing the offset of the hole axis and straightness error; The aperture is easy to expand; Rough hole wall; Large axial force during drilling.
So drill bit Generally, it can only be used for machining holes with low precision requirements, or for rough machining of holes with high precision requirements. The general dimensional accuracy of drilling is T11~T14, and the surface roughness is Ra60~12.5m.
In order to ensure the processing quality, the following measures are adopted in the process:
(1) Before drilling, the end face shall be machined to ensure that the end face is perpendicular to the drill to prevent deviation.
(2) During tool grinding, the two main cutting edges of the drill shall be symmetrical as far as possible, so that the radial cutting force generated by the two cutting edges is consistent.
(3) Shenzhen CNC precision processing plant uses drilling jigs as guiding devices, which can reduce the deviation at the beginning of drilling, especially on the inclined plane or curved surface.
(4) Small feed rate shall be adopted when drilling small or deep holes.