Selection of the bore dose
⑴ Allocation of alleatement The bore allowance is the size of the cutting depth left for the bore of treatment. Usually, the reduction allowance is smaller than the alleic or boring allowance. When the margin is too large, the coarse hinge and the fine hinge can be separated to guarantee technical requirements.
On the other hand, if the virgin margin is too small, it will lead to the porting of the prematurely bore, will not come normally and will also cause poor surface roughness. Generally, the bore margin is 0.1 to 0.25 mm, and for larger diameter holes, the margin cannot be greater than 0.3 mm.
There is an experience that suggests that the thickness of the diameter of the bore is 1 ~ 3% as a bore margin (diameter value). (20 * 2/100) = 19.6 For hard materials and certain aerospace materials, the bore margin is generally smaller.
⑵ The power rate of the bore holes The power rate of the bore holes is greater than that of the drilling holes, generally 2 to 3 times that of it. The purpose of taking a higher power rate is to ensure that Reamer cuts the material instead of the friction material. However, the RA value of roughness of the bump increases with the increase in the quantity of food. If the quantity of food is too small, it will increase the radial friction force and the relamer will quickly bring and make the reamours tremble, which means that the surface of the hole becomes rough.
When processing steel parts with standard steel bores, if RA0.63 surface roughness is obtained, the quantity of power cannot exceed 0.5 mm / r.
⑶ The speed of the altitude hole spindle is used to alter the different elements has an impact on the surface roughness of the borehole, among which the bore of bore is the largest. Roughness should be a better RA0.63; The chips are broken in granular shape and no accumulation will be formed. Usually, the speed of the Reamer spindle can be 2/3 of the speed of the spin of the drilled hole on the same material.
For example, if the speed of the drilling pin is 500R / min, it is more reasonable to adjust the speed of the Alelesal spindle to 2/3: 500 * 0.660 = 330r / min
The so-called alsular is actually a hole. .
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