Stefan Gaspar

Influence of Technological Factors of Die Casting on Mechanical Properties of Castings from Silumin

Die casting represents the highest technological level of metal mould casting. This technology enables production of almost all final products without necessity of further processing. The important aspect of efficiency and production is a proper casting parameters setting. In the submitted paper following die casting parameters are analyzed: casting machine plunger speed and increase pressure. The studied parameters most significantly affect a qualitative castings dimension and they influence the most a gained porosity level f as well as basic mechanical properties represented by tensile strength R m and ductility A 5.

The Effect of Degassing Pressure Casting Molds on the Quality of Pressure Casting

In these days in foundry branch there is a rapid development of sectors of special casting technology with the aim to increase the quality and the efficiency of pressure casting production.. Internal homogeneity of pressure casting, characterized by the extent of porosity can be affected by the setup of technological parameters of pressure casting and last but not least by vacuuming the molds, that means to exhaust air and gases from the mold cavity. Contribution is specifically aimed on the analyzing the impact of degassing pressure molds on the porosity of pressure casting.

Experimental Assessment of Roughness Changes in the Cutting Surface and Microhardness Changes of the Material S 355 J2 G3 after Being Cut by Non-Conventional Technologies

Production of components, necessary for the construction of the machine resp. or device is a demanding manufacturing process. One of the possibilities of increasing efficiency and production quality is the introduction of unconventional technologies to the production process. Knowing the dependence of the impact of non-conventional technologies on the mechanical properties of products and their subsequent verification is an important aspect when designing and manufacturing them. The article deals with the impact of used unconventional technology, that means laser, plasma and water jet on the roughness of a cutting edge and microhardness of material S 355 J2 G3.

THE RESEARCH OF THE FRACTURE PROCESS AND ANALYSIS OF THE FOUNDRY ERRORS OF DIE CASTINGS FROM HYPOEUTECTIC SILUMIN

The research in the technology of production of die castings from hypoeutectic silumin which are nowadays deeply implemented in the rapidly developing automobile, shipping and airline industry aims to increase the manufacture and quality properties of the castings. A higher attention is paid to die castings inner quality which is characterized by a type and range of casting-related defects. In accordance with a specific character of this production technology, the major casting defects are cavities, Al2O3 particles and internal cold laps. The presenting contribution deals with the research of the fracture process and analysis of the foundry errors of die castings from hypoeutectic silumin.

ANALYSIS OF PROCESS OF THE MOULD CAVITY FILLING OF THE LIGHTWEIGHT PROFILE FROM MATERIAL PE TIPPELIN 7100S BY THE TECHNOLOGY OF PLASTIC EXTRUSION

The presented paper deals with the examination of the mold cavity filling process for the production of lightweight plastic profiles from material PE TIPELIN 7100S applying the technology of extrusion into the mold. The principle of the extrusion technology and the carrying out of the experiments are determined in the introductory parts. The following parts focus on the analysis and evaluation of the mold cavity filling process for the production of lightweight profiles from from material PE TIPELIN 7100S with orientation on the influence of the mold temperature on the mold cavity filling time and status.

IMPACT OF CONSTRUCTIONAL MODIFICATION OF THE PRESSURE DIE CASTING MOLD INLET SYSTEM ON THE INTERNAL SOUNDNESS OF THE SILUMIN CASTING

The design of the inlet system has been regarded as a major factor in the internal homogeneity of the casting. Being designed correctly, the system should ensure the proper and continuous filling of the mold cavity. Continuous filling of the cavity gives the initial prerequisite for internal soundness and homogeneity of the casting reflected in its quality and mechanical properties. The paper deals with the design of the inlet system for a particular type of the casting, its optimization using computer simulation as well as evaluation of the real results measured on the casting physical models.

Crystallization of Aluminium Alloys

The structure and properties of cast metals and alloys are in a high degree influenced by crystallization conditions. By the technological interventions into the crystallization process the mechanical properties and structural parameters of castings can be enhanced. The present contribution deals with the regularities of crystallization of alloys Al-Si produced by die casting process.

Influence of the Amount of Recyclate and Regranulate Senosan on Tensile Properties of the Material Starex

An introduced article deals with the possibility of re-use of waste materials in production. The observed properties are the tensile properties of newly created material, namely yield stress, stress at break. Changes in strength characteristics and suitability of replacing the pure, primary material with the secondary, waste plastics were determined by material tests. The report gives a cross-section in methodology of tests performing, results processing and implementation into practice.

Analysis of Influence of Pressing Speed, of Melt Temperature and of Casting Position in a Mold upon Ultimate Tensile Strength Rm of Die Casting from Aluminium

The paper deals with analysis of influence of pressing speed, of melt temperature and of casting position in a mold upon ultimate tensile strength Rm of die casting from aluminium. The monitored parameters of die casting are very important in terms of production efficiency and quality of casting, which is positively reflected in economic indicators of the production.

Metal Flow Velocity in an Intake Port in the Process of Die Casting

The paper deals with metal flow velocity in an intake port in the process of die casting. In the theoretical part the author defines theoretical knowledge from the field of the mold cavity filling regime and the velocity of pressing the melt into the mold cavity. The practical part focuses on the impact of metal flow velocity in an intake port and the filling regime of the pressure foundry mold cavity, related to the former, on the homogeneity of the casting.