The hottest method to reduce the surface roughness
2022-10-22- Detail
Methods to reduce the surface roughness value of manual reaming
the surface finish of manual reaming is poor. In order to obtain a relatively ideal surface roughness value, in addition to the general precautions of manual reaming, some levels of products may be specially for the operation of excellent athletes, it is also necessary to improve the structure and geometric angle of the reamer, The main methods are as follows:
grind the cutting edge of the cutting part of the reamer with fine oilstone to a small fillet of about 0.1mm, which progresses slowly in the solid (see Figure 1). When machining, first rough ream the hole with a coarse reamer, leaving a fine reaming allowance of 0.04 ~ 0.08mm, and then finish ream with the grinded fine reamer to obtain a lower surface roughness value. In order to prevent the shrinkage of the reamed hole after extrusion, the above reamer can be polished with waste reamers of general specifications, and its diameter should be about 0.02mm larger than the diameter of the reamed hole to offset the shrinkage after reaming
1. How to judge whether the tension machine fixture is applicable:Figure 1 Figure 2
when reaming on a metal with high plasticity, a 0.5mm wide edge band can be ground with a fine oilstone in front of the blade of the reamer, and a front angle of -2 ° ~ -3 ° can be formed. Keep the width of the blade band as the original and publish 2/3 of astmb 800 and astmb 801 standards (see Figure 2), so as to weaken the sharpness of the blade. Due to the increase of the sharp angle, the heat dissipation conditions are improved, and it is not easy to crack, The surface roughness of reamed holes can be guaranteed to be above Ra0.8
Figure 3
when reaming a small hole, a Pentagon bladed reamer can be used (see Figure 3). Main deflection angle of reamer φ， The width of the blade band of the polishing blade is f=0.1mm, and the diameter of the reamer is equal to the maximum diameter of the reamed hole
when reaming, first use a coarse reamer for coarse reaming, leaving a fine reaming allowance of 0.03 ~ 0.04mm, and then use a bladed reamer for fine reaming. The surface roughness value of the inner hole can reach above Ra0.4. (end)
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