Firstly, introduction of slurry pump
The slurry pump also called centrifugal pump that usually delivers the slurry with corrosive solid particles, so that the manufacture adds the chromium alloy elements in the process to prove wear resistance and corrosion resistance of slurry pump.
However, the following problems exist in the casting high chromium cast iron slurry pump :
(1) high hardness
(2) large workpiece size, large margin
(3) Some parts of slurry pump are intermittent, such as impeller with 5-12 blades, which belongs to the strong intermittent cutting condition, the traditional tool will collapse.
Secondly, the inserts materials of process slurry pump
CBN inserts are the best choice to process the slurry pump according to the development of inserts. The BN-K1 materials applied comprehensively. Meanwhile, the inserts hardness can get over HRC95-100 to realize heavy-duty cutting and intermittence cutting the slurry pump.
Halnn super hard inserts BN-K1 inserts have some advantages:
(1)BN-K1 inserts belongs to solid CBN inserts, cubic boron nitrite content 90%, high hardness, excellent wear resistance.
(2)Non-metallic ceramics are used as binder to improve the heat resistance and collapse resistance of BN-K1 brand and to cut parts of the slurry pump intermittently.
(3) it can cut the surface margin of the slurry pump with large margin and improve the production efficiency.
(4) it adopts the dying cutting to reduce the production cost and obtain a good working environment.
A case parameter of Process the slurry pump : CBN BN-K1 inserts
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A Process parameter about the pump case of slurry pump :CBN BN-K1 inserts
Process materials: High chromium cast iron
Inserts number: BN-K1 CNMN120712-4S
Tools holder: CCLNL2525M1207
Cutting parameter: Vc=75m/min，Fr=0.1mm/r，ap=3.5mm
Process effect: When BN-K1 CBN tool is used to process high chromium casting slurry pump with large margin, it not only the wear resistance and impact toughness are excellent, but also the efficiency is improved. BN-K1 adopts dry cutting, which reduces the pollution of cutting fluid.
2. A Process parameter about the impeller of slurry pump: CBN BN-K1 inserts
Work piece: slurry pump impeller
Work piece materials: High chromium cast iron Cr26
Work piece diameter: 600mm
Inserts number : BN-K1 SNMN series
Processing procedure: rough turning
Cutting parameter: speed rotate 10r/min; feed rate 0.35mm/r;Depth of inserts penetration :1.5mm
Process methods: drying cutting
Machining affection: In order to meet the requirements of surface quality and dimensional accuracy, non collapse inserts are more wear-resistant.