Triangular toggle-rod working mechanism of servo mechanical press and optimized design method thereof

Abstract

The invention discloses an optimized design method of a triangular toggle-rod working mechanism of a servo mechanical press. The triangular toggle-rod working mechanism comprises a crank AB, a connecting rod BCE, an upper toggle rod CD and a lower toggle rod EF, wherein a sliding block is established by a point F, the upper toggle rod CD and the lower toggle rod EF are unequal in length, the upper toggle rod CD is shorter than the lower toggle rod EF, a point D and the point F are located on a vertical line, and points B, C and E are used for establishing the triangular connecting rod BCE. The optimized design method of the triangular toggle-rod working mechanism includes the following steps: 1) building a parameterized mechanical model; 2) establishing a parameterized virtual prototype model; 3) analyzing sensitivity of each structure parameter; and 4) building an optimization model and solving. Through the optimized design, the triangular toggle-rod working mechanism has a higher force increasing ratio and can greatly decrease the driving torque required by the crank under the condition of guaranteeing compact machine-body mechanism, sufficient sliding-block stroke and single sliding-block movement downstream, thereby lowering the capacity and cost of a servo motor. The triangular toggle-rod working mechanism of the servo mechanical press, designed by the invention has a reasonable structure and is convenient and practical.

Description

technical field [0001] The invention relates to a triangular toggle working mechanism of a servo mechanical press and an optimization design method thereof, belonging to an innovative design in the field of mechanical transmission. Background technique [0002] Ordinary mechanical presses are generally driven by ordinary AC asynchronous motors, and large flywheels are used for energy storage; while servo mechanical presses use AC servo motors instead of AC asynchronous motors, and cancel the flywheel, which not only simplifies the transmission chain, but also improves the automation and intelligence of the equipment. It can also save energy and reduce noise significantly, which is of great significance to energy saving and emission reduction in the manufacturing industry. Since the servo mechanical press has no flywheel, the working pressure is mainly generated by the instantaneous torque of the motor, so the capacity of the driving motor is much larger than that of the ordi...

AI Technical Summary

Problems solved by technology

The crank connecting rod has the advantage of simple structure, but the nominal pressure stroke is small and the booster ratio is small, so it can only be applied to small servo mechanical presses, such as a press disclosed in Chinese Patent No. ZL200320118186.8; although the symmetrical toggle There are quick return in the free stroke and similar stop characteristics in the working stroke, but the booster ratio is still not large enough, such as the mechanism disclosed in the Chinese patent No. ZL 200720054117.3 and ZL 200820082737.2; and the multi-link mechanism can improve the motion characteristics of the slider in the working stroke , there are still disadvantages such as not optimal boost ratio and complex structure, such as the mechanism disclosed in Chinese Patent No. ZL 200820030514.1

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