Showing papers on "Surface finishing published in 1970"

Automatic buff pressure setting

Abstract: An improved control circuit for use in a surface finishing machine having a driven surface finishing roll is adapted to establish and maintain a desired working pressure relationship between the finishing roll and a workpiece.

The Influence of Surface Finishing on Crack Length of Cemented Carbides

Abstract: In order to evaluate the thonghness of cemented carbides, the influence of surface finishing on crack length at vickers indetations was studied.The results are as follows.(1) Grinding introduces deformed surface layer. The heavier the grinding, the shorter the crack length. The increase in crack length resulting from polishing is caused by the removal of the surface layer produced in grinding.(2) Annealing at temperatures about 800°C removes the damage produced in grinding and polishing. Crack length in a given alloy reaches a maximum if the specimens are annealed after polishing.(3) This maximum crack length should be used in evaluating parameters for the crack resistance of an alloy.The crack resistance, which is independent of the indentation load and of the hardness of the alloy serves to evaluate the toughness of cemented carbides.

Coating chipboard surface finishing plates with - polytetrafluoro ethylene to reduce clogging of meshing of

Abstract: Clogging of mesh on the surface of finishing plates facing chipboards is reduced or prevented by coating the surface with polytetrafluoroethylene.

Improvements in the Surface Finishing of Aerated Concrete

Abstract: 1,178,941. Moulding aerated concrete. YTONG INTERNATIONAL A.B. 29 Jan., 1968 [31 Jan., 1967], No. 4510/68. Heading B5A. [Also in Division B2] Aerated concrete products, which are cast from mixed materials containing lime and silicic acid with water which is made porous by adding a foaming agent, are provided with a surface dressing of partially embedded mineral grains, e.g. gravel, applied prior to steam curing and which are applied by a compressed air spray as the spray nozzle and the surface are relatively displaced so that 40-60% of the surface is covered by the grains. Circular grains are preferred and 30-70% of the surface of the grains is embedded within the concrete and, after steam curing, the dressed surface may be coated with a translucent or transparent plastics or a lacquer, e.g. an aqueous acrylic dispersion, providing a water repellent surface. The finished products may be employed as floor, roof, or external wall units, masonry blocks, partition wall units, lintels or large panels or as sandwich elements enclosing a core of cellular plastics.

Wear under stick-slip conditions

Abstract: SUMMARY Works recently published deal mainly with the implications of the vibratory nature of the stick-slip motion. The “life” of the friction pair and the manner in which the stick-slip presence influences the wear are not approached enough. Some authors believe that wear is increased by this phenomenon. The present paper describes how under stick-slip or vibration conditions the main friction parameters (roughness, load, viscosity, velocity) influence the wear intensity as compared to the sliding friction where such phenomenon are attenuated. Thus, during the intermittent motion of cast iron plane surface, function of the presence and value of some parameters, the wear intensity of such surfaces can be greater, equal or smaller than in cases where the intermittences are practically damped. While the velocity and load parameters, in the case of machine tools, are generally imposed, the optimum surface finishing, in absence of the stick-slip motion, may be established to lead to smaller wear intensities.