The Dynamics Simulation Of Multi-spindle Gear Transmission Adjustment System Of Multi-point Forming Press

Multi-point forming(MPF) is a new forming method for sheet metal. It is a flexible forming technique. Its main idea is dividing traditional die into many height adjustable basal elements (or punches). These elements form the desiring surface under the control of computer and carry out the forming process of sheet metal. Adjustment control system is an important composing of MPF press. The research of the adjustment control system has an important meaning to the development and application of MPF technique. Conventional adjustment control system use the manipulator to adjust the basal elements. The new adjustment control system, the gear adjustment control system has obvious superiority in many aspects such as mechanism, adjustment and maintenance etc. Each adjustment control cell of the gear adjustment control system can adjust 16 punches at the same time. Here we consider an adjustment control element as our research object. A small electromotor drives a main active gear. The main active gear then drives 16 passive gears to finish the adjustment of the basal elements by cooperating with the clutch and screw poles etc. The adjustment and control part of the system can be put into independent cell. So it can be maintenance expediently. And so it can reduce the facility size and equipment cost. For the single adjustment control cell, the signal can be sent according to the basal elements needed adjustment and need not change the whole structure position. So the adjustment and control of the basal elements are simple. Therefore, the gear adjustment control system has the practice meanings for the research and application of MPF technique. As a new industry technology, virtual prototyping (VP) has been used in many fields and shown great technical advantages and economic benefits. The modeling and simulation of drive transmission system based on VP is an essential step for the system design in the future. This paper studies the gear adjustment control system including four research aspects-the components VP modeling, the modeling feasibility validation, the dynamic characteristic simulation and the controllability validation based on the software UG and ADAMS. 1) Research on dynamics analysis method The paper explains the basic theory of much rigid body system dynamics analysis. Description method of the system, the foundation of the reference frame and the redaction of restriction equation are introduced in detail. The basic theory of the dynamics for the software-ADAMS is analyzed and the dynamics equations are established. The contact dynamics modeling and the calculating method for contact force are analyzed in detail according to the simulation objective of the gear adjustment element. And so two dynamics analysis method are put forward. 2) The modeling analysis of the gear adjustment system The structure,sort and the compare of different standard facility and the adjustment control principle of the adjustment control system are expounded in detail. The movement characteristic and relation are analyzed and then the adjustment principle modeling is built. The facility simulation method is carried out and the parameters of adjustment element are introduced. The entity modeling is created in the CAD software. 3)The modeling feasibility validation The simple adjustment control element is imported into dynamic analysis software. Work condition is set the same to the fact. We can obtain the driver ratio, dynamics characteristic, driver error and interference and the key load by dynamic simulation of the gear adjustment element. Organ vibration characteristic can be obtained according to load characteristic. The gear joggle force has an obvious periodicity. There is a large vibration during startup. So safety checkout emphasizes on the electromotor startup. There are less and less sympathetic vibration signal between the system vibration frequency and the framework inherence frequency. It shows that the framework capability and design are good and reasonable. 4)The major factors affecting the gear dynamic characteristic The actual gear train system is a complicated dynamic system. There are much dynamic stimulation factors for example, timely joggle stiffness. Therefore it is necessary to analyze these influence in order to exactly reflect the dynamic characteristic of gear train. Based on this purpose, a equivalent torsion vibration modeling is established considering manifold stimulation and the principle and method of the modeling are described in detail. The equivalent stiffness and...