P. Berce - Academia.edu (original) (raw)

Papers by P. Berce

Research paper thumbnail of Experimental Research in the Field of SLM, for the Production of Biocompatible Components

Research paper thumbnail of Gogu Constantinescu-Integrala inventiilor

Research paper thumbnail of Nanostructured spray dried titanosilicate microspheres–structural and surface characterization

Research paper thumbnail of Experimental Research on Lubrication of Aluminum Injection Moulds

Research paper thumbnail of Research Regarding the Delamination of Carbon/Epoxi Composites Plates

Research paper thumbnail of The Manufacturing of Silicone Rubber Molds for the Food Industry

Research paper thumbnail of Injection Moulding Using Metal Spraying Technology

Research paper thumbnail of Experimental Research in the Field of SLM in Order to Reflect the Machine Work Parameters for Different Materials and Components

This paper describes the process of selective laser melting, the process of obtaining the compone... more This paper describes the process of selective laser melting, the process of obtaining the components of two types of Ti and stainless steel. The ability to select components according to the size that can be placed and processed directly on manufacturing plate or supports . Melting regime applied to each component and their manufacture, varying parameters for finding the correct components in order to manufacturing industrial and medical implants. Key words: Selective Laser Melting, Supports, Specimens, Scanning speed, Stainless Steel, Parameters.

Research paper thumbnail of Physico-Mechanical Properties Characterization of the Parts from Pa 2200 Manufactured by Selective Laser Sintering Technology

Research paper thumbnail of The Plane Statics of the Human Rescue Tripod

One of the most important parameters which influences the human rescue tripod are the forces whic... more One of the most important parameters which influences the human rescue tripod are the forces which act upon it. To determine this parameter from the design stage is an important aspect to any designer. This paper comes with a mathematical model, on which this force can be easily determined. Keywords: influence, human rescue tripod, important, mathematical model;

Research paper thumbnail of Porous Metal Structures from Ti Alloys Produced by SLM Technology

Research paper thumbnail of Finite Element Analyses of 3D Printed Composite Robot Component

ACTA TECHNICA NAPOCENSIS - Series: APPLIED MATHEMATICS, MECHANICS, and ENGINEERING, Apr 8, 2021

Among the most advanced technologies developed in recent years, additive manufacturing (AM) is on... more Among the most advanced technologies developed in recent years, additive manufacturing (AM) is one that meets the requirements of the Fourth Industrial Revolution. This study presents a redesigning approach of a robot gripper claw based on composite 3D printing method. The work is focused on the structure and layout of the continuous reinforcement fibers able to make a weight reduction and to increase the stiffness. The pattern strategy of fibers could be mixed to improve the mechanical response of the redesigned component at reasonable manufacturing costs. Finite element analyses (FEA) were developed to evaluate the proposed designs which used advanced materials as sandwich composites 3D printed. Compared to the conventional design of a nylon part, the reinforced models show an increment of stiffness. The redesigned models had a von Mises tension up to 60 MPa and a safety factor around 3.5. Based on these preliminary findings, future study could be developed to optimize and to customize the design of robot gripper claws using composite 3D printing technology.

Research paper thumbnail of Rapid Manufacturing of Silicone Rubber Molds as Complex Shapes for Food Products

mtf.stuba.sk

Abstract: All industries, including food industry have seen spectacular developments in the exten... more Abstract: All industries, including food industry have seen spectacular developments in the extent of discovery of new materials with special properties. This paper provides a brief presentation of silicone elastomers used to manufacture some cake forms, to improve ...

Research paper thumbnail of Gyors prototípus előállítása lom eljárással

Fiatal Műszakiak Tudományos Ülésszaka, 2002

The "Laminated Object Manufacturing" (LOM) give the results to the manufactured piece of 3D model... more The "Laminated Object Manufacturing" (LOM) give the results to the manufactured piece of 3D models and that is sectioned for some parallel and perpendicular planes.We obtained in this way the real piece prototype.

Research paper thumbnail of Technical queries of a 3D design custom-made implant made from titanium particles for maxillofacial bone reconstruction

Particulate Science and Technology, 2019

Accurate 3D bone reconstruction is one of the most difficult tasks to achieve in maxillo-facial s... more Accurate 3D bone reconstruction is one of the most difficult tasks to achieve in maxillo-facial surgery. In the present study, a zygomatic bone defect was reconstructed with a custom made implant fabricated by selective laser melting (SLM) processing from titanium particles. 2 years follow-up revealed diplopia (double vision) resolution, as well as esthetic and functional stabile reconstruction. Technical queries regarding the fabrication process and medical reconstruction are discussed.

Research paper thumbnail of Effect of different surface treatments on bioactivity of porous titanium implants

Journal of Materials Science & Technology, 2019

Highlights  medical grade Ti6Al7Nb alloy implants manufactured by Selective Laser Melting (SLM) ... more Highlights  medical grade Ti6Al7Nb alloy implants manufactured by Selective Laser Melting (SLM)  heat treatment, chemical treatment, and impregnation with bioactive materials  treatments effect on bioactivity of SLM derived implants tested in vitro  XRD, SEM/EDX, XPS analyses. The work aims to characterize the structure and to evaluate in vitro the effect of different surface treatments on the bioactivity of medical grade Ti6Al7Nb alloy implants manufactured by selective laser melting. In order to improve the bioactivity of these samples, they were subjected to heat treatment, chemical treatment, and impregnation with bioactive materials. To evaluate the apatite forming ability, the samples were immersed in simulated body fluid solution) and characterized before and after immersion by scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The composition and the texture of the surfaces after the applied treatments have a selective effect on apatite layer development on the surface of samples.

Research paper thumbnail of Selective Laser Melting for Rapid Product Development

Selective laser melting (SLM) is one of the most important technologies used when complex metalli... more Selective laser melting (SLM) is one of the most important technologies used when complex metallic parts need to be rapidly manufactured. There are some requirements related to the mechanical properties of the material, surface roughness, the accuracy of the manufactured part and the process control, in order to turn SLM process into a production technique. The presented work investigates if the SLM process, according to the state of the art, fulfills these manufacturing requirements, trying to show meantime few opportunities / applications of the metallic parts manufactured by means of SLM. The results of the developed research underline and recommend that compensation factors must be used, in order to get a good correlation between the SLM manufactured prototype and the CAD model dimensions. By doing so, the time needed for the Rapid Product Development process using the SLM manufacturing method will be significantly decreased. Finite element analysis (FEA) and Design Expert software were jointly used in order to determine the optimum process parameters and the compensation factors required to improve the accuracy of the SLM process. An interesting case study undertaken at the Technical University of Cluj-Napoca (TUCN) in cooperation with an industrial company from Romania, using our MTT Realizer II SLM 250 equipment is also presented in the paper . Key words: Additive Layer Manufacturing (ALM), Rapid Manufacturing (RM), Rapid Prototyping (RP), Selective Laser Melting (SLM), Finite Element Analysis (FEA)

Research paper thumbnail of Research on Obtaining Bent Tubular Parts Made of Reinforced Fiber Composite Materials Using Modern Methods of Rapid Manufacturing

This paper presents research related to obtaining bent tubular parts made of reinforced composite... more This paper presents research related to obtaining bent tubular parts made of reinforced composite materials using modern rapid manufacturing methods. Based on competitive prototyping, this paper presents a comparative study of two modern mould manufacturing methods. This paper is also presenting an innovative modern technology for manufacturing tubular folded and inflated parts made of fiber reinforced composite materials. Key words : tubes, composite materials, Rapid Prototyping, CAD, CAM

Research paper thumbnail of Research on Water Jet Milling Strategies

Research paper thumbnail of Wax Pattern Defects

It is common knowledge that the investment casting process or “lost wax process” starts with a wa... more It is common knowledge that the investment casting process or “lost wax process” starts with a wax pattern. It is created by injecting wax into a mould cavity, where the pattern is an exact copy of the cast part with strict dimensional tolerances. It also has to allow for shrinkage of the material to be cast. This pattern is then dipped into a silica slurry bath. For a good surface finish, finer slurry and zircon sand is often used. The shell is then heated to dewax the mould, followed by firing and preheating before the molten metal is poured into the dewaxed cavity. A good understanding of the wax injection process is essential for good quality parts to be created. Key words : investment casting, modeling methodology, cost reduction, concurrent engineering

Research paper thumbnail of Experimental Research in the Field of SLM, for the Production of Biocompatible Components

Research paper thumbnail of Gogu Constantinescu-Integrala inventiilor

Research paper thumbnail of Nanostructured spray dried titanosilicate microspheres–structural and surface characterization

Research paper thumbnail of Experimental Research on Lubrication of Aluminum Injection Moulds

Research paper thumbnail of Research Regarding the Delamination of Carbon/Epoxi Composites Plates

Research paper thumbnail of The Manufacturing of Silicone Rubber Molds for the Food Industry

Research paper thumbnail of Injection Moulding Using Metal Spraying Technology

Research paper thumbnail of Experimental Research in the Field of SLM in Order to Reflect the Machine Work Parameters for Different Materials and Components

This paper describes the process of selective laser melting, the process of obtaining the compone... more This paper describes the process of selective laser melting, the process of obtaining the components of two types of Ti and stainless steel. The ability to select components according to the size that can be placed and processed directly on manufacturing plate or supports . Melting regime applied to each component and their manufacture, varying parameters for finding the correct components in order to manufacturing industrial and medical implants. Key words: Selective Laser Melting, Supports, Specimens, Scanning speed, Stainless Steel, Parameters.

Research paper thumbnail of Physico-Mechanical Properties Characterization of the Parts from Pa 2200 Manufactured by Selective Laser Sintering Technology

Research paper thumbnail of The Plane Statics of the Human Rescue Tripod

One of the most important parameters which influences the human rescue tripod are the forces whic... more One of the most important parameters which influences the human rescue tripod are the forces which act upon it. To determine this parameter from the design stage is an important aspect to any designer. This paper comes with a mathematical model, on which this force can be easily determined. Keywords: influence, human rescue tripod, important, mathematical model;

Research paper thumbnail of Porous Metal Structures from Ti Alloys Produced by SLM Technology

Research paper thumbnail of Finite Element Analyses of 3D Printed Composite Robot Component

ACTA TECHNICA NAPOCENSIS - Series: APPLIED MATHEMATICS, MECHANICS, and ENGINEERING, Apr 8, 2021

Among the most advanced technologies developed in recent years, additive manufacturing (AM) is on... more Among the most advanced technologies developed in recent years, additive manufacturing (AM) is one that meets the requirements of the Fourth Industrial Revolution. This study presents a redesigning approach of a robot gripper claw based on composite 3D printing method. The work is focused on the structure and layout of the continuous reinforcement fibers able to make a weight reduction and to increase the stiffness. The pattern strategy of fibers could be mixed to improve the mechanical response of the redesigned component at reasonable manufacturing costs. Finite element analyses (FEA) were developed to evaluate the proposed designs which used advanced materials as sandwich composites 3D printed. Compared to the conventional design of a nylon part, the reinforced models show an increment of stiffness. The redesigned models had a von Mises tension up to 60 MPa and a safety factor around 3.5. Based on these preliminary findings, future study could be developed to optimize and to customize the design of robot gripper claws using composite 3D printing technology.

Research paper thumbnail of Rapid Manufacturing of Silicone Rubber Molds as Complex Shapes for Food Products

mtf.stuba.sk

Abstract: All industries, including food industry have seen spectacular developments in the exten... more Abstract: All industries, including food industry have seen spectacular developments in the extent of discovery of new materials with special properties. This paper provides a brief presentation of silicone elastomers used to manufacture some cake forms, to improve ...

Research paper thumbnail of Gyors prototípus előállítása lom eljárással

Fiatal Műszakiak Tudományos Ülésszaka, 2002

The "Laminated Object Manufacturing" (LOM) give the results to the manufactured piece of 3D model... more The "Laminated Object Manufacturing" (LOM) give the results to the manufactured piece of 3D models and that is sectioned for some parallel and perpendicular planes.We obtained in this way the real piece prototype.

Research paper thumbnail of Technical queries of a 3D design custom-made implant made from titanium particles for maxillofacial bone reconstruction

Particulate Science and Technology, 2019

Accurate 3D bone reconstruction is one of the most difficult tasks to achieve in maxillo-facial s... more Accurate 3D bone reconstruction is one of the most difficult tasks to achieve in maxillo-facial surgery. In the present study, a zygomatic bone defect was reconstructed with a custom made implant fabricated by selective laser melting (SLM) processing from titanium particles. 2 years follow-up revealed diplopia (double vision) resolution, as well as esthetic and functional stabile reconstruction. Technical queries regarding the fabrication process and medical reconstruction are discussed.

Research paper thumbnail of Effect of different surface treatments on bioactivity of porous titanium implants

Journal of Materials Science & Technology, 2019

Highlights  medical grade Ti6Al7Nb alloy implants manufactured by Selective Laser Melting (SLM) ... more Highlights  medical grade Ti6Al7Nb alloy implants manufactured by Selective Laser Melting (SLM)  heat treatment, chemical treatment, and impregnation with bioactive materials  treatments effect on bioactivity of SLM derived implants tested in vitro  XRD, SEM/EDX, XPS analyses. The work aims to characterize the structure and to evaluate in vitro the effect of different surface treatments on the bioactivity of medical grade Ti6Al7Nb alloy implants manufactured by selective laser melting. In order to improve the bioactivity of these samples, they were subjected to heat treatment, chemical treatment, and impregnation with bioactive materials. To evaluate the apatite forming ability, the samples were immersed in simulated body fluid solution) and characterized before and after immersion by scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The composition and the texture of the surfaces after the applied treatments have a selective effect on apatite layer development on the surface of samples.

Research paper thumbnail of Selective Laser Melting for Rapid Product Development

Selective laser melting (SLM) is one of the most important technologies used when complex metalli... more Selective laser melting (SLM) is one of the most important technologies used when complex metallic parts need to be rapidly manufactured. There are some requirements related to the mechanical properties of the material, surface roughness, the accuracy of the manufactured part and the process control, in order to turn SLM process into a production technique. The presented work investigates if the SLM process, according to the state of the art, fulfills these manufacturing requirements, trying to show meantime few opportunities / applications of the metallic parts manufactured by means of SLM. The results of the developed research underline and recommend that compensation factors must be used, in order to get a good correlation between the SLM manufactured prototype and the CAD model dimensions. By doing so, the time needed for the Rapid Product Development process using the SLM manufacturing method will be significantly decreased. Finite element analysis (FEA) and Design Expert software were jointly used in order to determine the optimum process parameters and the compensation factors required to improve the accuracy of the SLM process. An interesting case study undertaken at the Technical University of Cluj-Napoca (TUCN) in cooperation with an industrial company from Romania, using our MTT Realizer II SLM 250 equipment is also presented in the paper . Key words: Additive Layer Manufacturing (ALM), Rapid Manufacturing (RM), Rapid Prototyping (RP), Selective Laser Melting (SLM), Finite Element Analysis (FEA)

Research paper thumbnail of Research on Obtaining Bent Tubular Parts Made of Reinforced Fiber Composite Materials Using Modern Methods of Rapid Manufacturing

This paper presents research related to obtaining bent tubular parts made of reinforced composite... more This paper presents research related to obtaining bent tubular parts made of reinforced composite materials using modern rapid manufacturing methods. Based on competitive prototyping, this paper presents a comparative study of two modern mould manufacturing methods. This paper is also presenting an innovative modern technology for manufacturing tubular folded and inflated parts made of fiber reinforced composite materials. Key words : tubes, composite materials, Rapid Prototyping, CAD, CAM

Research paper thumbnail of Research on Water Jet Milling Strategies

Research paper thumbnail of Wax Pattern Defects

It is common knowledge that the investment casting process or “lost wax process” starts with a wa... more It is common knowledge that the investment casting process or “lost wax process” starts with a wax pattern. It is created by injecting wax into a mould cavity, where the pattern is an exact copy of the cast part with strict dimensional tolerances. It also has to allow for shrinkage of the material to be cast. This pattern is then dipped into a silica slurry bath. For a good surface finish, finer slurry and zircon sand is often used. The shell is then heated to dewax the mould, followed by firing and preheating before the molten metal is poured into the dewaxed cavity. A good understanding of the wax injection process is essential for good quality parts to be created. Key words : investment casting, modeling methodology, cost reduction, concurrent engineering