Progettazione a matrice di utensili abrasivi CBN galvanizzati

Progettazione a matrice di utensili abrasivi CBN galvanizzati

High precision narrow and deep grooves have always been a challenge in mechanical processing. Previously, narrow and deep grooves with a width of>2 mm su parti in materiale ordinario venivano solitamente pre-fresate con una fresa per intaglio, trattate termicamente e quindi rettificate con una mola più sottile in resina o legante ceramico. Questo processo ha una bassa efficienza di lavorazione, una bassa resistenza della mola, una scarsa rigidità e una breve durata, rendendo difficile ottenere un'elevata precisione di lavorazione. Utilizzando il normale processo di rettifica ad avanzamento lento della mola, è possibile lavorare scanalature strette e profonde ad alta precisione dopo un trattamento termico di rettifica del pezzo. Per scanalature strette e profonde con una larghezza di<2mm, milling processing has high cost and low accuracy; When using ordinary grinding wheels for slow feed grinding, the thickness of the working area of the grinding wheel is very thin, and the amount of dressing is large. It is easy to break during grinding and dressing, and the processing cost is high. In recent years, electroplated superhard abrasive wheels have been widely used for high-precision slot slow feed grinding. Electroplated CBN grinding wheels have been used abroad to slowly feed grind narrow and deep grooves with a width of 1.52mm, a depth of 6.35mm, and a radius of 0.38mm on 4340 steel parts with a hardness of HRC42. Electroplated CBN grinding wheels are also used domestically to slowly feed and grind narrow and deep grooves with a width of 1.5mm on ordinary steel. Many aviation parts made of difficult to machine materials have various high-precision grooves, especially the machining of high-precision tooth grooves and narrow and deep straight grooves at the root of aircraft turbine blades, which has always been a difficulty in blade machining in China. This article will introduce the design of the grinding tool matrix for slow feed grinding of narrow and deep grooves with electroplated CBN grinding wheels.

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