Showing papers in "China Metal Forming Equipment & Manufacturing Technology in 2009"

Study on Development of Motor in Drive System for Mechanical Press

Abstract: Various driving modes of mechanical press have been expounded in the text. Various driving motor of servo press have been analyzed and compared,such as DC servo motor,AC servo motor,switched reluctance motor and transverse flux motor. The characteristics of various motor have been analyzed as well as their application on press. It is pointed out that transverse flux motor of servo press has obvious value of theory and practical application by its excellent characteristics of low speed.

The Properties and Operation of Large Mechanical Linkage Servo Press

Abstract: The advantages of the linkage servo press have been analyzed in the text.The test result of five servo presses for auto panel purchased by Dongfeng automobile company has been declared.The data of one-year operation of these presses and the economic benefit have been illustrated.The optimized design has been put forward,which improves the properties and development of the large servo press.

The Study of Spinning Precision Control for Thin Wall Cylinder with Large Length-diameter Ratio

Abstract: The improvement measures of spinning cylinder quality and its technology reliability have been illustrated in the text.On the basis of the research of high precision control for thin-wall cylinder with large lengthdiameter ratio,finally the weldless cylinder of 4200 mm in length has been produced,which improves the cylinder quality and the reliability of the shell.

Current Study on Simulation and Compensation of Springback in Sheet Metal Forming Process

Abstract: Springback in sheet metal forming is the reverse elastic deformation during the process of unloading process, which is a widespread physics phenomenon. At present, more commercial CAE software could simulate the course of springback during the sheet metal stamping process,but the simulation precision is still difficult for the numerical simulation. The main factors which impact the simulation accuracy of springback have been analyzed in the text in details. The development of simulation and compensation techniques of springback at home and abroad have been summarized,which is helpful for making a reasonable technology in stamping process, amending die sizes, as well as compensating errors of springback in the die design process by considering the key factors of springback.

Three Dimensional Surface Registration on the Basis of Genetic Algorithm

Abstract: In order to calculate the shape error between the formed work-piece and its CAD model in reverse engineering,two-step surface registration method combining ICP algorithm and Genetic Algorithm optimization has been proposed. With Genetic Algorithm method,the initial surface error has been calculated by aligning the data from different coordinate system in first rough registration step.ICP algorithm method has been employed to calculate the surface error further in second step.The global optimal registration result can be obtained while the local convergence has been avoided in the algorithm. Due to its rapid convergence characteristic,it is not only used in analysis and amending of the curved surface error after multi-point forming,but also in the comparison between measure results of different smooth curved surface in other industry.

The Research of Bottom Dead Center Oscillogram for High Speed Press

Abstract: The bottom dead center profile of high speed press in idling time has been promulgated in the text by comparing with the import equipment. Many instances prove that under loading and ramming specific component, the difference between the trough minimum value and the wave ridge maximum in the bottom dead center oscillogram is a definite value. The calculation methods under two special situations have been put forward.

Research on Tube Spinning Process and Properties of Cast Titanium Alloy

Abstract: The tube spinning process of cast titanium alloy has been analyzed with the reason for defect in this spinning process discussed. The microstructure and mechanical properties of spun work piece have been analyzed. The results show that the cast titanium alloy can be spun with appropriate processing parameters, then the obvious fiber organization has been formed, and then the casting crystal grain can be hardly found when reduction is over 72 percent, finally the strength and plasticity of the product have been increased.

Improvement of Hydraulic System for Four-column Hydraulic Press

Abstract: The slide beam supporting system of YZ series four-column hydraulic press has been analyzed and researched,and the oil circuit control system has been improved,which not only reduces the hydraulic shock when the slide beam slide changes speed from fast to slow,but also overcomes the automatic fall fault when the slide beam stops

The Precision Test Research of the Bottom Dead Center in High-speed Press

Abstract: The bottom dead center of some high-speed press at idle-load and load has been measured by using model Rm-72 BC testing apparatus. The BDC varying data has been obtained and analyzed when changing the slide running speed,weight of slide,weight of dynamical counterbalance or running time at idle-load. The testing results show that if the weight of slide,the running speed or the running time increase,the BDC would deviate downwards, but the variation of the counterbalance's weight would not affect the change of BDC obviously. The BDC of poly-type of high-speed presses has been tested at idle load,and difference in BDC wave has been found. The tests show that the shape of BDC wave would change along with the increase of speed,also the high-speed press with different configuration would have difference on oscillogram. These findings may helpful to control the BDC precision of the high-speed press.

The Motion and Mechanics Study on the Jaw of Large Drawing Press

Abstract: The working principle of large drawing press has been introduced in the text.When the loading of press is out of limit,the aluminum plate would be broken.The jaw is a key motion part,which plays a crucial role.The easy-broken position on the jaw has been found out,and corresponding solution has been conducted.

An Experimental Study on Dynamic and Static Mechanical Behaviors of B410LA

Abstract: B410LA is high-strength steel plate which is often used in car body.Stress-strain curves of B410LA at different strain rates have been obtained through tensile test and tensile impact test. From the stress- strain curves obtained,it is found that the strength of B410LA increases along with the increase of strain rates.The constitutive relation of B410LA has been obtained through fitting of the stress - strain curves,which offers reliable material parameters for CAE.

Finite Element Analysis of Straight Single-Point Press Frame

Abstract: Based on the construction features of straight single-point press made by our company, by using Solid Edge program, a model of framework frame has been built. The frame strength and rigidity have been analyzed by FEM software——Femap With Nastran. The structural stress and deformation distribution have been obtained by means of restricting the corresponding degree of freedom and adding to nominal loading in accordance with the actual requirements, which provides a reliable structural reasonable design with theory proof.

Application of Numerical Simulation Technology in the Hot Forming Process Design of Train Wheel

Abstract: Based on the numerical simulation result and analysis of the upsetting,pre-forming,dishing technology in train wheel hot forming with the finite element software DEFORM-3D in the text,the effective application of numerical simulation technology in hot forming process design for wheel has been expatiated,such as determination of the optimum upsetting block height and rolling expansion,selection of the reasonable upsetting dies,prediction of maximum deforming area in dishing forming,using forward-backward point tracking method to analyze the defects relationship between rough wheel and stocks,etc. It is very important for the reasonable design of wheel hot forming process,quality improvement of wheel forming,incensement of production efficiency,and reduction of cost.

The Procedure and Mechanics Research of Extrusion Deformation for FGH96 Alloy

Abstract: The excellent bars have been obtained through extrusion process to FGH96 alloy in the text. The microstructure of FGH96 alloy has been analyzed by using DMLM microscope. The results show that the PPB of FGH96 alloy has been broken up completely after extrusion. Meantime,small and symmetrical grain has been gained. The size of grain is about 3~10um. The distribution and morphology of γ' phase have been observed by Leica DMLM microscope. The result was that γ' phase has been broken and distribute the boundary of grain after extrusion.At the same time,the plastic deformation of FGH96 alloy has been studied by JEM-2010EX transmission electron microcopy.

The Parameterized Design of the Fine-Blacking Die Based on the Further Development of SolidWorks

Abstract: The further development technique of SolidWorks has been discussed by use of Visual Basic, and a parameterized design system of the fine-blacking die has been set up. The parameterized design system, the process of automatic creating the parts of the die, automatic assembling the die, and automatic creating the drawing have been realized with the help of VB software. It can greatly improve the design efficiency and reduce the design cost.

Finite Element Simulation of Grain Size during Isothermal Forging Process of the TC4 Aerofoil Blade

Abstract: The changes of grain size of prior phase has been simulated during isothermal forging process of the TC4 aerofoil blade by combining finite element method and the microstructure model, which takes the dislocation density rate as an internal state variable The results show that the grain size of phase decreases with the increase of deformation temperature and reduction of press-down height, meanwhile the grain size of phase decreases with the increase of hammer velocity

Thin-walled Tube with Small Radius and Internal Medium Pressure Forming Technique

Abstract: As the defects of getting thinner,crack,wrinkle during manufacturing the thin-walled tube with small radius process,by use of the world advanced technology-internal high pressure forming process,the new technique combined medium pressure forming and bending tube process has been obtained. With the new technology,the profile quality of the tube has been improved,which is special good for the water tap production in kitchen and bathroom.

Optimization and Study on Volume Speed-modulating System of Variable Displacement Pump-Fixed Displacement Motor

Abstract: On the basis of establishing the mathematical model of the volume speed modulating system in variable displacement pump-fixed displacement motor,the GISE criterion has been used to optimize the system. The influence of parameters to the characteristics has been analyzed,which offers the theoretical basis to the system design,characteristics study and actual application.

The AC Servo Drive and Energy-saving of the Forming Equipment

Abstract: The main reason for high energy consumption and low effect in forming machine industry is that the unmatching between large loading at periodic peak and rigid uncontrollable driving.The crucial issues in driving process of energy-saving forming machine have been introduced in the text,such as,controllable velocity,adjustable volume,be ready to stop,energy-recycle.The AC servo motor based on large power solves the unmatching issue,which implements the automation,intelligence,and energy-saving.Taking the crank press,hydraulic press,and screw press as example,the theory analysis and test have been conducted.The servo driving can reduce the consumption of energy by 25%-70%.

Analysis for Processing and Prevention of Lube Oil Dipping in Press

Abstract: Taking the lubricating system and the typical model structure of the press machine as an example,the reasons for lubricant oil leaking have been analyzedThe principle and failure cause of lipshape oil sealing has been introducedThe general three demand formulas of lubricant oil of press machine have been listedThe concept-theories in designing the oil box have been discussedFinally,the three kinds of oil leaking reason have been explained,and the homologous solutions have been put forward

The Study on Driving Technology of Linear Motor

Abstract: The key technical problems during application of motor on material receiver hand of punching machine have been researched and analyzed as well as the principle,advantages,the calculation and analysis of the motor.

Finite Element Analysis and Experimental Study of the Disc Steering Knuckle Die Forging

Abstract: Two kinds of disc steering knuckle blank forming process have been simulated and analyzed by use of finite element analysis software Deform3D. Reasonable blanking profile has been determined as per the metal flow situation during forming process. The disc steering knuckle die forging has been successfully manufactured according to the simulated blank, which can reduce the cost and improve the productivity.