A Four Corner Leveling System for Composite Presses Realizing Gross Tonnage Control

Abstract

The invention provides a composite press four-corner leveling system capable of achieving total tonnage control. The output end of the leveling system is a sliding block, multiple leveling units are evenly arranged on the periphery of the sliding block, and are connected with a control unit, the leveling units each comprise a leveling cylinder, an information collection element and a servo valve connected with the leveling cylinder, rods of the leveling cylinders are in contact with the sliding blocks in the leveling process, the control unit synchronously controls the rods of the leveling cylinders and output force through the servo valves to enable the sliding blocks to be leveled, closed-loop distribution and single-cylinder pressure precision control over four basic pressures of the leveling system can be achieved, and the leveling system total output force and sliding block levelness can be effectively controlled.

Description

technical field [0001] The invention relates to the technical field of composite material production equipment, in particular to a four-corner leveling system for a composite material press that realizes total tonnage control. Background technique [0002] The composite material press is the most important equipment in the compression molding process, and its performance directly determines the quality of composite material products. In the actual production process, the press is limited by its own structure, and its working table will experience uneven force and uneven heating. The effect of the partial load produces an overturning moment, which causes different degrees of inclination, which affects the manufacturing accuracy of the molded parts and the degree of wear of the mold. With the significant increase in precision requirements for composite material products, the multi-axis leveling system has emerged as the times require, which is an important part of high-end co...

AI Technical Summary

Problems solved by technology

[0005] (1) The slider is affected by the joint action of the host system and the leveling system during the pressing process. Since the total leveling force changes when the leveling system is adjusted, the balance state of the slider in the vertical direction is broken, making the movement of the slider The trajectory is affected, and the master cylinder needs to be adjusted accordingly to maintain the original trajectory movement, resulting in pressure fluctuations, causing load interference in the leveling system, and affecting the leveling control results

[0006] (2) During the leveling process, the leveling cylinder follows the slider down, and a certain flow needs to flow out from the control valve, and the opening of the control valve is determined by the difference between the actual pressure and the target pressure, so the actual pressure and the target pressure will inevitably cause There is a difference between the target pressures, and there is uncertainty in this error, which makes the actual pressure uncontrollable, which will not only affect the result of position synchronous control, but also further increase the error between the total leveling force and the expected value

[0007] (3) The output force of the four cylinders is the same at the initial stage of leveling, and no leveling torque is generated. Since the mechanical structure is released during the leveling process, the slider will increase the initial displacement deviation under the influence of the partial load force. If there is If the eccentric load moment is large, the initial displacement deviation will be large, which will not only increase the control difficulty of the subsequent leveling system, but also increase the wear of the master cylinder

Images