The hottest PCBN tool in Inconel718 machining

Application of PCBN tools in Inconel 718 machining

I. Introduction to Inconel 718 application

the term "superalloy" describes a wide range of nickel, iron and cobalt based alloys developed specifically for applications that usually require excellent mechanical and chemical properties at high temperatures. About two thirds of super alloys are used in the manufacture of power turbines and related parts in the aviation industry

the typical application of these alloys is the hot end of aircraft engines. The remaining third is used in applications requiring special high temperature performance and/or excellent corrosion or oxidation resistance in the chemical, medical and construction industries

inconel 718 is a precipitation hardened nickel chromium alloy containing a considerable amount of iron, niobium and molybdenum, as well as a small amount of aluminum and titanium. It combines corrosion resistance, high strength and excellent welding performance (including resistance to post weld cracking). The alloy has excellent creep rupture strength at temperatures up to 700 ℃

common Inconel 718 parts include: gas turbine, rocket engine, atomic reactor, pump, shaft and connector, etc

II. Application scope of PCBN processing Inconel

the existing PCBN material grade for effective processing Inconel 718 is very clear. It has been proved to be very successful for continuous cutting with cutting depth less than 0.5mm. Rough machining with a cutting depth greater than 0.5mm is usually unsuccessful. Semi finishing has been proved to be very successful. Precision machining to realize the tightening of springs usually requires trial before being implemented, because it may affect the surface integrity

recommended working area for Inconel 718 (30 ~ 45hrc) turning (Note: not suitable for intermittent cutting. Use e25 cutting edge for grinding. Tool material grade cbn100/cbn10)

recommended working area for Inconel 718 turning

recommended working area for Inconel 718 (30 ~ 45hrc) cutting groove (Note: not suitable for intermittent cutting. Use e25 cutting edge for grinding. Tool material grade cbn10)

recommended working area for Inconel 718 groove

III. geometric angle and grinding of PCBN tools suitable for Inconel machining

standard turning

when machining Inconel 718, the cutting edge grinding shown in the figure for standard turning is the most frequently used. The geometric angle of a negative rake angle and the chamfering of an e25 provide the best combination of cutting edge strength and tool performance for finish machining

thin organize resources with rich construction experience to enter the construction wall parts of the project

when processing thin-walled parts, the company will provide free technical training for the corresponding technicians, operators and maintenance personnel of the manufacturer in terms of comprehensive operation, maintenance, repair and other aspects, it may be necessary to use a 0 ° front angle geometry. This will reduce the cutting force generated in the machining process and reduce the possibility of flattening thin-walled parts

IV. processing case

1) jet engine combustion chamber

material: Inconel 718 forging blank

hardness: 35hrc

surface: pre processed

process: semi finishing

material grade: cbn10

blade model: tngn110308e25-l1 1 Regularly check the screws at the jaw.

cutting speed: 350m/min

feed rate: 0.25mm/rev

cutting depth: 0.5mm

coolant: there are

results cbn10= processing time: 6 minutes

whisker toughened ceramics =10 minutes

2) cylindrical turning of the shaft

material: Inconel 718 forging blank

surface: pre machined

process: semi finishing

material grade: cbn10

blade model: tnga160408 E25-l1

cutting speed: 300m/min

feed rate: 0.10mm/rev

cutting depth: 0.5mm

coolant: with

results tool life: 12 minutes

3) cutting groove of shaft

material: Inconel 718 forging blank

hardness: 35hrc

material grade/blade:

cbn10=lcgn1604me25-lf

wc=lcmr1604m-mp, 883

cutting speed: cbn10=170m/min

wc=30m/min

feed rate: cbn10/wc=0.2mm/rev

cutting depth: cbn10/wc=0.2mm

coolant: there are

results

tool life: cbn10=12 minutes

wc=10 minutes

cbn10 reduces the cutting time by up to 85%, and improves the surface.Roughness

v. conclusion

in general, Inconel 718 is a difficult to machine material, Processing parameters need to be optimized according to each part to ensure the maximization of tool life. Micro chipping of cutting edge, rapid wear of flank and groove wear are the most common problems in machining this material. The grinding of cutting edge has a significant impact on the tool life. Be careful when trying to exceed the recommended cutting depth. (end)