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Cavity formation in cross-wedge rolling processes

Journal of Iron and Steel Research International 2019年第1期26卷 1-10页

作者： Zbigniew Pater Janusz Tomczak Tomasz Bulzak department of computer modelling and metal forming technologies Mechanical Engineering FacultyLublin University of TechnologyLublin 20-618Poland

The problem of end-face cavity formation in parts produced by cross-wedge rolling was studied in order to reduce material *** cavity depth was measured by the displacemern ***-one different cases of rolling were analysed by finile element method to determine the effects of process parameters such as the wedge tool angle,the temperature of material,the tool velocity and the reduction ratio on the depth of end-face *** between these parameters are examined in order to establish depe ndencies enabling quick and simple selection of a con cavity allowance in order to remove the *** equations for calculating the con cavity allowance were verified in an experimental process for manufacturing ball pins with the use of flat *** tests were performed using a billet with its length selected in compliance with the established *** experimental results demonstrate that the proposed solution is a viable method for end-face cavity removal.

关键词： Cross-wedge rolling End-face cavity Concavity allowance Ball pin

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Numerical Analysis of Unconventional Forging Process of Hollowed Shaft from Ti-6Al-4V Alloy

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Journal of Shanghai Jiaotong university(Science) 2011年第2期16卷 157-161页

作者： GONTARZ Andrzej PATER Zbigniew TOFIL Arkadiusz department of computer modelling and metal forming technologies Lublin University of Technology Technical Institute State School of Higher Education in Chelm

This paper presents theoretical analysis of unconventional forging process of hollowed shaft from Ti-6Al-4V alloy in a three-slide forging *** method in comparison with other metal forming methods allows for obtaining of hollowed *** designed process is verified theoretically by means of numerical simulations based on finite element method with assumption of 3D state of *** following factors are considered in the analysis:material flow kinematics,strain distribution,temperature distribution and force of *** the basis of results,it is stated that the application of designed technology allows for obtaining of a product of assumed quality.A comparison is made between material consumption in analyzed process and material consumption in typical metal forming methods,also in used at present technology of shaft manufacturing by machining *** is stated that the application of forging in the three-slide forging press allows for a considerable decrease of manufacturing costs due to material savings and decrease of labor consumption of operations at finishing.

关键词： hollowed shaft die forging three-slide forging press finite element method

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The Design of a Graphical User Environment for Numerical Simulation of Powder forming Processes

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厦门大学学报（自然科学版） 2002年第S1期41卷 -页

作者： A R Khoei S Keshavarz department of Civil Engineering Sharif University of TechnologyDepartment of Civil Engineering Sharif University of Technology Tehran IranTehran Iran

As computer simulation increasingly supports engine er ing design and manufacture, the requirement for a computer software environment providing an integration platform for computational engineering software increas es. A key component of an integrated environment is the use of computational eng ineering to assist and support solutions for complex design. computer methods fo r structural, flow and thermal analysis are well developed and have been used in design for many years. Many software packages are now available which provi de an advanced capability. However, they are not designed for modelling of powde r forming processes. This paper describes the powder compaction software (PCS_SU T), which is designed for pre- and post-processing for computational simulatio n of the process compaction of powder. In the PCS_SUT software, the adaptive analysis of transient metal powder forming process is simulated by the finite element method based on deformation theories . The error estimates and adaptive remeshing schemes are applied for updated co -ordinate analysis. A generalized Newmark scheme is used for the time domain di scretization and the final nonlinear equations are solved by a Newton-Raphson p rocedure. An incremental elasto-plastic material model is used to simulate the compaction process. To describe the constitutive model of nonlinear behaviour of powder materials, a combination of Mohr-Coulomb and elliptical yield cap model is applied. This model reflects the yielding, frictional and densification char acteristics of powder along with strain and geometrical hardening which occurs d uring the compaction process. A hardening rule is used to define the dependence of the yield surface on the degree of plastic straining. A plasticity theory for friction is employed in the treatment of the powder-tooling interface. The inv olvement of two different materials, which have contact and relative movement in relation to each other, must be considered. A special formulati

关键词： The Design of a Graphical User Environment for Numerical Simulation of Powder forming Processes

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Additive manufactured metallic implants for orthopaedic applications

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Science China Materials 2018年第4期61卷 440-454页

作者： Kwok-Chuen Wong Peter Scheinemann department of Orthopaedics and Traumatology Prince of Wales HospitalThe Chinese University of Hong KongHong Kong 852China Implantcast GmbH D-21614 BuxtehudeGermany

metallic implants are commonly used in various orthopaedic surgeries, like fracture fixation, spinal instrumentation, joint replacement and bone tumour *** may need to adapt to the fixed dimensions of the standard implants. It may result in suboptimal fit to the host bones and possible adverse clinical results. The standard traditional implants may not address the reconstructive challenges such as severe bone deformity or bone loss after implant loosening and bone tumour resection. With the advent of digital technologies in medical imaging, computer programming in three-dimensional（3 D） modelling and computer-assisted tools in precise placement of implants, patient-specific implants（PSI） have gained more attention in complex orthopaedic reconstruction. Additive manufacturing technology, in contrast to the conventional subtractive manufacturing, is a flexible process that can fabricate anatomically conforming implants that match the patients’ anatomy and surgical requirements. Complex internal structures with porous scaffold can also be built to enhance osseointegration for better implant longevity. Although basic studies have suggested that additive manufactured（AM） metal structures are good engineered biomaterials for bone replacement, not much peer-reviewed literature is available on the clinical results of the new types of implants. The article gives an overview of the metallic materials commonly used for fabricating orthopaedic implants, describes the metal-based additive manufacturing technology and the processing chain in metallic implants; discusses the features of AM implants;reports the current status in orthopaedic surgical applications and comments on the challenges of AM implants in orthopaedic practice.

关键词： 3D printing additive manufacturing electron beam melting orthopaedic implants patient-specific porous scaffold

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