The three-dimensional figure of a toroidal worm is obtained according the simulation based on the mathematical model. The key of this is the authenticity of the worm surface expressed. Comparing a simulating worm with the true worm, the conformational degree between them can be found out. As the worm surfaces are complex space surfaces, so it is difficult to determine the measuring method and reference for the surfaces of a worm. According to the entire analysis's, the symmetry section of the worm is defined as a representing section. The space surface measuring is converted to a plane curve measuring, and the possibly existing error will be analyzed. The experiments for checking two true worms are made to prove the truthfulness and reliability of the simulation program of the plane enveloping toroidal worm.
300MN forging hydraulic press is the essential equipment in our country national defense
and the infrastructure, and the primary work cylinder is one important part of the hydraulic press. In
view of the judgment on the Working States of the primary work cylinder whether safe existence
fuzziness, which has carried on the fuzzy reliability analysis and computation to the primary work
cylinder probability law design result and the method of safety coefficient design result, the computed
result indicated that, the design result with traditional safety coefficient is conservative, but based on
probability design result is not safe enough. At the same time, under the condition that don’t reduce
the fuzzy reliability, which has carried on the optimal design based on the finite element software to
the thickness of the primary work cylinder.
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