Technological mode choice for silicon carbide plate diamond abrasion

There is stated a choice of a technological mode for diamond abrasion ensuring a required process capacity and silicon carbide plate quality. The correlations of a silicon carbide removal rate with the length of surface micro-cracks with the roughness height of a surface are stated. A procedure is offered for setting technological modes which do not result in plate billet destruction during manufacturing special devices.

CUTTING OUTPUT PARAMETER EFFECTIVENESS CONTROL BASED ON ANALYSIS OF MASS-DIMENSIONAL PARAMETERS OF REPLACEABLE HARD-ALLOY PLATES

The purpose of the work – development of recommendations on correct choice support of hard-alloy plate quality according to the conditions specified of plates operation. In the work there is formed a new approach to the analysis of hard-alloy plates of a metal-cutting tool which develops an approach existing in the RSSs and conditions a necessity to develop a metrological support of plate quality for the conditions of specified working conditions. The approach is based on the simultaneous account of some plate parameters by means of the introduction of conditional quality grades. The investigation results: - the impact of the value spread of mass and dimensions of plates upon plate quality is defined, - the criteria of their division into grades depending on a spread value are defined. Conclusions: the results of plate classification according to the parameters: “plate weight”, “plate length”, Plate width” and “plate thickness differ considerably; plate weight effects most the output parameters of part work-piece machining process, plate thickness impact is the smallest; home plate quality is not so acceptable for the billet high-performance machining of precision parts; the adaptation of acting RSSs to plates taking into account the requirements for modern NC machines; under current conditions a technologist of an engineering enterprise-consumer of plates is unable to order meaningfully their essential number because of the domination of low-quality plates.

Semi-continuous caster for plate

Purpose: Development of a semi-continuous caster that can cast a single plate and a clad plate of Al-40%Sn-1%Cu alloy used for sliding bearings. Design/methodology/approach: A semi-continuous caster to cast a single plate and a clad plate directly from molten metal was designed and assembled. The cast single plate has a thickness ranging from 10 mm to 30 mm, a width of 400 mm, and a length of 500 mm to 1,000 mm. The cast clad plate has a thickness ranging from 10 mm to 30 mm, a width of 50 mm, and a length of 300 mm. Findings: The semi-continuous caster successfully produced both a single plate and a clad plate of Al-40%Sn-1%Cu alloy. Influence of casting conditions on the properties of the plate, including the thickness, porosity, and surface quality were investigated in the single plate casting. The mixing and diffusion of the alloy elements at the interface was also investigated in the clad plate casting. Research limitations/implications: The cast Al-40%Sn-1%Cu alloy plate has not yet been tested as a sliding bearing material, so the efficacy of the material still requires investigation. Practical implications: The semi-continuous caster described in this paper enables the “small lot” production made from single and clad plates of aluminium alloy. Originality/value: Development of a semi-continuous caster that can cast both single and clad plates of aluminium alloy. Investigation of the relationship between the casting conditions and plate quality.