By Hun Guo, Zuo Dunwen, Tang Guoxing
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Additional resources for Advanced Design and Manufacturing Technology I
This paper illustrates the experimental research for cutting chips on hardened alloy steel 42CrMo. (20℃). 42CrMo has high strength; good harden ability, good toughness, small deformations in hardening, high creep strength and creep rupture strength in high temperature. It is used to manufacture forge pieces with high strength and big modified treatment sections such as big gears used in locomotive, gears used in intensifier driver, rear axles, link rods and alligator clips bearing great loads. It is also used to manufacture oil drilling rod joints and finger grips and so on.
9 T , adjust the parameters and calculate the corresponding PPI′ . 9 T , adjust the parameters and calculate the corresponding PPI′ . The iteration will stop when meeting NN. The current cj , σj , Pl are output as the optimal solution. The structure of the PID controller is presented in the following form: δ (t ) = [ KI e (t ) − K 1 − z −1 P ( ) + 1 − z −1 K D ]ψ (t ) (8) Where ψ(t) and δ(t) represent the system output (course angle) and the system input (rudder angle) respectively. e(t)=ψr(t)-ψr(t).
Macro and Micro Research on Chips A simple and convenient method of judging cutting temperature by chip color suggested by Venkatesh is called heat oxidation estimation . The method is suitable of judging cutting temperature: different chip color means different cutting temperature (see in table 4). ℃ Chip temperature℃ ＞1000 ＞1000 dark blue 960-1000 981 blue & 920-960 dark blue & green purple blue & 860-920 900 brown 820-880 881 light brown 800-840 837 brown The chips in this trial are different as the cutting speed changes.
Advanced Design and Manufacturing Technology I by Hun Guo, Zuo Dunwen, Tang Guoxing