What are the machining methods for deep hole machining of spindle?

(1) The machining mode of workpiece rotation and tool feed is adopted, so that the drill bit has self-centering ability and avoids deviation when drilling.

(2) Adopt a special structure tool-deep hole drill, so as to increase the guiding stability and chip breaking performance and adapt to the deep hole processing conditions.

(3) Pre-process a more accurate pilot hole on the workpiece, so that the drill will not deviate when cutting begins.

(4) Convey enough cutting fluid to the cutting area by pressure to cool and lubricate the drill bit and discharge it together with the chips.

In single piece and small batch production, the extended twist drill is often used in horizontal lathe machining, and it needs to be withdrawn several times during machining to remove chips and cool the drill bit. Therefore, the production efficiency is low and the labor intensity is high. In mass production, deep-hole drilling machines generally use internal chip-removing deep-hole drills for processing, which can be continuously fed during processing. Within the length of 1000 mm, the axis deviation of the drilled excircle is 1 mm, and the surface roughness Ra is 3.2 ~12.5 microns ... The production efficiency is more than twice as high as the former, and the labor intensity can be reduced.

The drilled deep hole should be finished to meet the requirements. There are two methods for finishing deep holes: boring and reaming. Because the tool is slender, broaching and reaming methods can be used to process deep holes on the drilling machine in addition to the general feeding method. The method of broaching and reaming is to make the arbor tense, so it can prevent bending.