Cubic nitrogen changes boracic razor blade to be in the application of industry of bearing of dial of report of slewing ring, wind

Slewing ring / the hardness after surface of ferrule of bearing of wind report dial quenchs achieves HRC55 -- 62, hard layer of temper by dipping in water is commonly 3, 5mm, 50Mn or 42CrMo material pledge ferrule of bearing of dial of report of slewing ring, wind is ground with car generation commonly used establish a car to undertake cutting is machined doing type; Working procedure of hard turning of slewing ring annulus because mental allowance big and raceway and bearing face are machined after quench (good car) when treatment precision requirement is strict, posed very big challenge to the tenacity of good car razor blade and wearability. The crucial move that the performance that exceeds razor blade of good good car makes bearing of dial of report of slewing ring, wind grind craft with car generation evenly. It is current that cubic nitrogen changes boracic bit black metal treatment uses the best cutting tool material in cutting tool to pledge, good car razor blade is already wide after serving as heat for hep, as a result of the limitation of brittleness, after general be confined to quenchs, small surplus is ground with car generation use; According to good car of industry of bearing of dial of report of slewing ring, wind the character with big mental allowance, discuss visit course of study to grind craft and good car to use the development that exceeds strong cutting tool with car generation. The mental allowance of foreword of hard lathe work after the heat of bearing of dial of report of the requirement slewing ring that good car of bearing of dial of report of slewing ring, wind machines pair of cutting tool function, wind is a basis the heat treatment craft before this and quench of deflection obligate, after bearing of dial of report of general circumgyrate slewing ring, wind quenchs, good car surplus is 2, 6mm; Good car razor blade machines the need when inside and outside of bearing of dial of report of the slewing ring after quenching, wind is encircled in large surplus exceedingly good fight concussion tenacity; After annulus of inside and outside of visible slewing ring quenchs, good car difficulty is in cubic nitrogen changes tenacity of boracic razor blade the demand is high, and Che Guangjie of the essence after slewing ring raceway is hot spends requirement and dimension stability to ask cubic nitrogen changes function of wear-resisting of boracic razor blade and thermal stability exceedingly good. So or of industry of bearing of slewing ring dial complains cubic nitrogen changes hardness of boracic razor blade low not wear-resisting causes treatment bright and clean spend difference, or is bit knife of too fragile easy collapse, especially intermittent face cutting position. In the light of bearing of dial of report of slewing ring, wind good car treatment opposes square nitrogen changes the function of boracic razor blade to ask, hua Ling exceeds good development to give nitrogen of metalloid adhesive cubic metre to change name of BN-S20 of boracic razor blade, as home exclusive metalloid base bond exceeds strong cutting tool, while BN-S20 brand made sure cubic nitrogen changes tenacity of boracic cutting tool, avoided to bring about the bit life that premature bate creates bond of the metal after exceeding be heated of strong cutting tool because of adding metallic bond to reduce, BN-S20 brand suits to be opposite large after quenching, tall hardness workpiece undertakes in vehicle of high speed wide choice, its hardness is HRC98.

5; Can machine limits of the hardness after heat treatment: HRC45- - HRC79. Suit long turning of large surplus strong voice or with the car era is ground. With car generation grinding work art is in slewing ring / the use case that the feasibility of industry of bearing of wind report dial and new name surpass strong cutting tool: Case one: Exceed good bit to machine ferrule of bearing of wind report dial to be with BN-S20 brand exemple, 5mm of surplus of vehicle of the fine after quenching; Surface roughness of surface of raceway groove of surface roughness of vehicle of the fine after linear velocity 90-150m/min quenchs achieves Ra0.

3 μ M, generation of full enough car grinds craft to ask; The channel heart of raceway groove of form of good car double peach after heat is jumpy and total ＜ 0.

005mm, from treatment efficiency and cost consideration, with the car era grinds an advantage apparent, machine wind report with bearing industry 1.

5MW aircrew uses change the outer lane inside oar bearing (dimension: 1900mm of external diameter φ , thick 130mm) for exemple, if quench hind mental allowance uses grinding treatment entirely, rubbing time is 18 hours of above, collect generation of car of in order to to grind craft, time needs only 4.

5 hours. Below the requirement that machines precision likewise, using a car to machine efficiency is 4 times what grind treatment; Will tell from cutting tool durability, nitrogen of BN-S20 brand cubic metre dies turning of boracic razor blade 1900 wind report changes oar bearing ferrule is exemple, but fine vehicle many 30 ferrule; The electric energy that wastes and artificial, stock cost material has the 1/5 of grinding only however; Cutting tool durability is tall, use cost is lower. Case 2: Material of good car 50Mn is qualitative after quenching outer shroud of large slewing ring, HRC55 of the hardness after heat treatment, unilateral mental allowance 2.

5mm. Because of 50Mn annulus after quenching be out of shape, aperture is shown inside not neat circle, use formerly exceed good bit to often appear collapse blade phenomenon, to reduce the collapse damage loss of cutting tool, can use treatment taking a knife for many times to finish only, bring about treatment efficiency is low, equipment is had rate is high, the integrated finished cost such as charge of charge of electricity, auxiliary material increases. Use brand of metalloid adhesive BN-S20 to exceed good bit, cutting deepness 2.

5mm left and right sides, not neat place achieve 3mm; Use treatment taking a knife to finish, reduce knife frequency to machine efficiency to raise 3 times, bit is not the collapse knife of concern making a person, disintegrate; And because metalloid adhesive thermal conductance is tall, below identical rotate speed, exceed tower above of good bit life than whole of adhesive of raw common metal 50% . BN-S20 material exceeds good bit photograph to compare character common exceed good bit, production cost raised only 10% , but those who change is the treatment efficiency promotion of 3 times is mixed 1.

The cutting tool life of 5 times, the cutting tool of the user uses cost to be reduced substantially. When generation of car of in order to grinds craft to encircle good car to machine to inside and outside of bearing of dial of report of the slewing ring after heat, wind, compare with grinding photograph, avoided grinding burn, and, large bearing can choose hard turning means of dry type cutting, economic environmental protection; And machine than grinding, the scrap that hard turning comes down is OK very convenient processing, reclaim as resource use cost low, reduce pair of environment pollution. Place of good car of the risk that grinds craft with car generation and control uses what machine tool clearance and tigidity decided shake knife, issue letting a knife to produce odds, also can affect the dimension precision that processes work and exterior surface roughness, the geometrical figure that needs the requirement according to oneself workpiece and the choice bit that use equipment state specific aim now so includes cubic nitrogen to change the microcosmic processing of boracic blade point, reduce with the oldest rate with the car era grinds craft risk. With the car in the light of industry of bearing of dial of report of slewing ring, wind era is ground, type of size of geometry of commonly used razor blade chooses according to model of rotary table bearing and craft; General inside and outside encircles place to machine commonly used and cubic nitrogen to change BN-S20 of qualitative brand of material of boracic razor blade; It not only suit bearing of dial of report of zephyr of big diameter slewing ring, also suit to be not mark bearing to be ground with car generation, whole quenchs the large surplus of ferrule of bearing of hardness HRC60 above walks along a knife to replace kibble working procedure under diametical 500mm; To quenching hind mental allowance is less than 0.

The ferrule of small size bearing of 3mm can choose nitrogen of BN-H20 brand cubic metre to change boron.

Those who need an attention is surplus of pair of hard turning of ferrule of the bearing after quenching bigger or have intermittent the razor blade when treatment needs point to handle 0.

2*20 is spent lose edge, and 6-7 of the horn before design of lever of lathe tool of form a complete set gives outfit card to lose is spent for beautiful; Processing of point of the blade when vehicle of the fine after small surplus is hot is taken commonly 0.

1mm loses edge; Radius of circular arc of bit point of a knife machines place to undertake choosing with tool clamping apparatus according to bearing ferrule car, in order to ensure whole with the car era grinds treatment process depressed knife, do not let a knife. CNC Milling