a handful of analysis, selection of blank decided to parts of the actual effect, materials, shape, the nature of the production, and in production possibility, blank manufacturing method mainly has the following kinds:

1, profile

2, forging

3, casting

4, welding

5, other blank.

According to the parts of material, recommend using profile or castings, but from the economic aspect, such as with the bar in the material, machining allowance is too big, so that not only waste materials, but also increase the machine tool, cutting tool and energy consumption, and the casting has high tensile bending and torsional strength, impact toughness are often used to load or work parts under impact load. The parts material for HT200, considering the parts on the job should have high wear resistance, so choose the cast iron casting. Q = 6000 / year according to the design requirements, n = 1 pieces/sets; Rejection rate of alpha and beta in combination with actual production, spare parts rate to 10% and 10% respectively in formula

The workpiece production platform

N = 6066 / year

Second, determine the machining allowance, blank dimensions and tolerances Check the manual casting method according to the machine model, according to the gray cast iron casting material, to the casting tolerance CT grade levels for 8 ~ 12 off for 11. Casting method according to the machine model, material for HT200 castings machining allowance level G - grade I choose G design tasks required for processing size, allowance and tolerance.