The process method of reducing the surface roughness of the slender shaft (rod) on the lathe is one using the single-wheel honing method; the other is the rolling method. This is an effective measure to solve the problem of low roughness with simple tools and processes on the lathe and the problem of grinding without a grinder.
After finishing the slender shaft (bar) on the lathe, if the roughness has not reached the requirements of the drawings, the single-wheel honing method can be used to rework the workpiece surface, which can reduce the roughness of the workpiece surface from Ra6.3μm to the masonry (1.6 to 0.2) μm. The angle between the axis of the honing wheel and the axis of the lathe spindle is generally 28 ° -30 °. Large angle, high efficiency, high roughness, small angle, low efficiency, low roughness.
The honing wheel speed is generally (30 ~ 60) m / min, the feed rate is (0.5 ~ 2) mm / r, the larger value is selected for coarse honing. The pressure of the honing wheel on the workpiece is (150 ~ 200) N. For workpieces with poor rigidity, a follower holder should be used. The particle size of the honing wheel is generally 100 # ～ 180 #. If the roughness is to reach Ra0.2, the particle size of the honing wheel should be W40 ～ W280. The lubricating liquid used for honing should be kerosene or diesel oil with 5% -10% oleic acid added. . When there are no conditions, ordinary emulsion can also be used to clean and lubricate the honing process.
The rolling processing of the slender shaft (rod) can efficiently reduce the surface roughness while improving the surface hardness and wear resistance. Due to the poor rigidity of the workpiece, the follow tool holder must be used for rolling. The method is the same as the slender shaft of the rough turning, that is, the follow tool holder is placed in front of the rolling tool, so as to avoid the claw of the follow tool holder from scratching the workpiece surface. Rigid or elastic rolling tools can roll thin shafts (rods). The rolling times are generally not more than twice. The rolling speed is (20 ~ 30) m / min, and the feed rate is (0.1 ~ 0.2) mm / r. It is lubricated with oil, and it can also be lubricated with emulsion.
