Research of Casting Moulding of Epoxy Resin Composites Reinforced with High-Strength Fibres during the Manufacturing Operations

Abstract

In general, epoxy resins are known for their excellent adhesion, chemical and thermal resistance, unique mechanical properties and excellent electrical insulators. The various fibres are incorporated into epoxy resin matrix materials. With the prepared samples, the fibre tests are passed. The results of the investigation are also taken into account due to the strength of the connection between the fibre and the matrix. The aim of our research is the preparation and subsequent testing of epoxy-based composite materials during their manufacturing operations, specifically by casting technology. The properties of fibre-reinforced composites depend significantly on the choice of fibre and matrix, and how they are combined, the fibre-matrix ratio, the fibre length, its orientation, the thickness of the composite and the presence of a bonding agent to improve fibrematrix bonding.

Research and Evaluation of the Influence of the Construction of the Gate and the Influence of the Piston Velocity on the Distribution of Gases into the Volume of the Casting

“…As the mean thickness of the cast h reaches the value of 2 mm for the particular cast and maximal cast length l (in this case it is the cast diameter) reaches the value of 116.5 mm, the melt velocity in the gate for reference gating system is determined to the value of v G1 = 35 m·s −1 . By means of continuity Equation (1) and taking into consideration the closed system [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ], piston velocity is determined v P1 = 2.8 m·s −1 : S G × v G = S P × v P , …”

“…Regardless of technological parameters the key factor influencing the air entrapment in the melt volume is a correct structure of both the gating and the venting system of the mold [ 12 , 13 , 14 ]. Reaching the high quality of die casting depends on the filling mechanism of the mold cavity by the molten metal.…”

“…The objective pursued is to achieve reduction of distribution of gases to the cast volume during die casting cycle. On the basis of knowledge and information published in [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ] it is possible to understand the system of filling chamber—shaping cavity—as a closed system (pipeline). On the basis of hydrodynamics it can be thus assumed that velocity in the gate with preservation of constant flow rate of the melt is influenced by the cross section of the gate or by velocity of the piston.…”

Influence of Gating System Parameters of Die-Cast Molds on Properties of Al-Si Castings

“…The die-cast part should be designed to assure sufficient area for placement of the ingate and the venting channels [9]. The width of the ingate shall be achieved when the ingate area is divided by its height.…”

Uso de PRFC para mejorar las propiedades mecánicas del concreto: una revisión

“…Las estructuras compuestas reforzadas con fibras se han convertido en materiales de ingeniería muy competitivos en los últimos años y han ido sustituyendo gradualmente a los materiales metálicos convencionales y a otros materiales poliméricos en muchas industrias importantes [6] .…”