机械要点（Mechanical points）.docVIP

机械要点（Mechanical points） 1: production program: enterprises according to market demand and their own production capacity to develop production plans. The output and schedule of the product to be produced during the planned period shall be called the production program. 2 types of production: mass production, mass production, single production. 3 cutting surfaces: machined surfaces, machined surfaces, and transition surfaces. 4 the basic properties of cutting tool materials are: high hardness, high wear resistance, good thermal conductivity and thermal shock resistance, high heat resistance, good process performance and economy. 5 commonly used tool materials: tool steel, carbide, ceramics, cubic boron nitride, diamond. 6 measure the chip deformation: shear angle, deformation coefficient and shear strain. 7 chip type: strip chip, knot shaped chip, granular chip, broken chip. 8 the source of cutting force: first, the resistance of the cutting layer metal, chip and workpiece surface metal deformation caused by elastic-plastic deformation; two, the friction resistance between the tool and chip, workpiece surface. 9 the cutting heat is transmitted from the chip, workpiece, cutting tool and surrounding medium to the outside. 10 tool wear pattern: the flank wear, the flank wear, the rake face and the flank surface wear at the same time. 11 reasons: tool wear abrasive wear, oxidation, diffusion, cold ~ ~ ~ ~, electric. 12, cutting tool blunt standard: tool wear to a certain limit can not use, this wear limit is called ~. 13 tool life: the cutting time of the grinding tool since it starts cutting until the amount of wear reaches the standard of grinding. 14 choice of cutting principle: first select the depth as large as possible, then according to the strength, the knife rod feeding mechanism of machine tool stiffness constraints or machined surface roughness requirements from the feed as large as possible, and finally determine the cutting speed is calculated according to th