Hydraulic Control System for Bending Machines
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Abstract
This thesis aims to design an efficient, stable, and precise hydraulic control system for bending machines. By analyzing the working principles and requirements of bending machines, combined with advanced hydraulic control technology, the design of the hydraulic servo control system for bending machines is realized. This design mainly introduces the design of the hydraulic system, including hydraulic cylinder design, variable pump design, and hydraulic servo control system design. During the design process, the selection of various components is also considered to ensure the normal operation and safety of the system. This design provides new ideas and methods for the design and optimization of hydraulic control systems for bending machines, contributing to the technological advancement and innovation in related fields.
Keywords: Bending machine; Hydraulic control system; Structural design
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Table of Contents
Abstract1 Introduction1.1 Research Background and Significance1.2 Current Research Status at Home and Abroad1.2.1 Domestic Research Status1.2.2 International Research Status2 Working Principles of Hydraulic Systems in Bending Machines2.1 Structural Composition2.2 Working Principles3 Design Calculations of Hydraulic Systems in Bending Machines3.1 Hydraulic Cylinder Design3.1.1 Initial Selection of System Pressure3.1.2 Calculation of Hydraulic Cylinder Structural Dimensions3.2 Variable Pump Design3.2.1 Principles of Variable Pumps3.2.2 Selection of Variable Pumps3.3 Selection of Other Components3.2.1 Selection of Valve Components3.3.2 Selection of Hydraulic System Filters4 Design of Hydraulic Servo Control Systems4.1 Selection of Servo Control Systems4.1.1 Determination of Servo Drives4.1.2 Selection of Servo Motors4.2 PID Control Algorithm4.3 Simulation Model of Fuzzy Control4.4 Simulation of Fuzzy PID Control Algorithm4.4.1 Design of Load Parameters4.4.2 Response of Hydraulic System to Step Loads5 ConclusionAcknowledgmentsReferences
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Principles and Functions
The hydraulic system of the bending machine is the core power and control part during the working process of the bending machine. It achieves precise control of the bending machine’s working process through the precise coordination of various hydraulic components.The structure of the hydraulic system of the bending machine consists of pressure relays, check valves, speed control valves, stroke valves, filters, hydraulic cylinders, one-way sequence valves, three-position four-way reversing valves, check valves, pressure gauges and switches, relief valves, and variable pumps. The working principle diagram of the hydraulic system is shown in Figure2-1: 
Figure2-1 Working Principle Diagram
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Design Highlights
The hydraulic control system designed for the bending machine highlights the following features: the use of an efficient variable displacement pump combined with a closed-loop servo valve to achieve real-time adjustment of pressure and flow, significantly improving energy utilization; the hydraulic cylinder adopts a modular structure, with precise calculations of aperture and piston area based on the initial system pressure selection, ensuring optimal matching of rigidity and stroke; valve components are selected with self-diagnostic functions, equipped with multi-stage filters, significantly enhancing system reliability and reducing maintenance costs; at the control level, a dual-layer adaptive control model is constructed by integratingPID and fuzzy control algorithms, achieving rapid response and steady-state error suppression for different loads and step loads.
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Screenshot of the Manual
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Program Screenshots, Electrical Diagrams, and PLC Program Package
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