Mud pump cylinder liner directly affects its life, because it is an important easy wear component of hydraulic end of mud pump. The Bimetallic Cylinder Liner’s surface gets in touch with the high pressure and temperature of gas.
Firstly, the categories and advantages of drilling mud pump liner
The drilling mud pump liner generally some types :Single metal cylinder liner, bimetallic cylinder liner, ceramic cylinder liner and nickel-based alloy cylinder liner.Among them, bimetallic cylinder liner is the most widely used and one of the largest parts of hydraulic end of mud pump.
The bimetallic cylinder liner consists of Inner and outer sleeve. The outer sleeve adopts hot-pressed with high quality carbon steel and have a tensile strength of more than 900 000 psi. The inner sleeve is cast with high chromium cast iron. After heat treatment, the hardness of the inner sleeve is over HRC62, and it can withstand the mud pressure of 7000 psi. Therefore, the inner and outer surface and inner hole dimensions of the cylinder sleeve are strictly required.
The process arts and the heat treatment of Cylinder liner of drilling bimetallic mud pump
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outer sleeve:Original test---Blank processing of coat--Rough outer circle--Rough inner hole--Hot charging--- Boring hole --Finish grinding-- Finish turning
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inner sleeve: Centrifugal casting--Annealing Treatment - Rough turning Outer Circle - Rough turning Inner Hole - Semi-Finished turning Outer Circle - Quenching - Nondestructive Testing - Hot Packing (Hot Packing with Outer Coat)
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Heat treatment methods include normalizing, annealing, quenching, tempering and hot charging. The enterprises choose the heat treatment according to the arts.
How to choose the suitable inserts to Cylinder liner of drilling bimetallic mud pump after the heat treatment.
The hardness of drilling bimetallic mud pump can get over HRC62 through the heat treatment which the process difficult and the sizes accurate are high. Tool materials for processing ferrous metals have many categories including the Cemented carbide cutter,Ceramic tool and Cubic Boron Nitrite inserts.
The reason why choose the Cubic Boron Nitrite inserts :
(1) Cemented carbide tools are only suitable for processing ferrous metals with hardness below HRC45 because of their properties.
（2）Ceramic cutters are suitable for processing ferrous metal materials with hardness HRC 45-55, and they are also minor finishing processes.
（3）Cubic boron nitrite (CBN) blade has the best effect in processing ferrous metal materials with hardness HRC45 or higher, because its hardness is second only to that of diamond tools, and diamond tools are collectively called super hard tools.
Halnn super hard over ten years of super hard focus has become the most famous tool brand in the field of hard material processing. Since its inception, Halnn super hard has continuously provided high-efficiency, high-quality and high-performance product cutting tools for the field of high-hardness and difficult-to-process materials. It enjoys a high reputation in the field of super hard tool academia. In the field of hard material processing tools, Halnn super hard has led the world's first-class level.
For the cylinder liner of drilling bimetallic mud pump, Halnn super hard cutter has professional cubic boron nitrite inserts processing, the details are as follows.
The case parameter about the Cylinder liner of drilling bimetallic mud pump by process of Halnn super hard CBN inserts
Name :Slurry pump liner
Materials : High Chromium White Cast Iron
Heat treatment method: surface hardening
Hardness: HRC60-65 or so
Workpiece diameter: 178 mm, wall thickness: 5 mm, length: 450-600 mm
Processing position: outer circle, chamfer
Number: BN-S30
Tool holder: CCLNR2525M1207
Insert Model:CNMN120712-8S
Cutting parameter:Line speed Vc=90-120m/min,Cutting stock Fr=0.25mm,Cutting depth Ap=2mm
Durability: 9 pieces/edge