Analysis of the Vitrified CBN Wheels for the Performance of Grinding Hardened Steel

Luo, S.Y.; Wu, S.Q.; Hsu, F.J.

doi:10.4028/www.scientific.net/AMR.264-265.937

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HomeAdvanced Materials ResearchAdvances in Materials and Processing Technologies...Analysis of the Vitrified CBN Wheels for the...

Analysis of the Vitrified CBN Wheels for the Performance of Grinding Hardened Steel

Abstract:

This paper investigates the effect of the CBN abrasive types, sizes, concentration, bond amount, and porosity of a vitrified-bonded CBN wheel on grinding ratio, grinding forces, and surface roughness of grinding hardened steels. The experiment results showed that during grinding hardened steels the amount of bond with increase of the depth of cut increased, which makes the wheel to have a better bonding strength to get a better grinding ratio and surface roughness of the workpiece. The grinding forces produced increased with the increase of the depth of cut. In addition, too much porosity of a vitrified CBN wheel will cause the low bond strength, leading the wheel to wear rapidly. Hence, to obtain a higher grinding ratio and better surface roughness of the workpiece during the grinding hardened steels should select relatively a higher amount of bond, a lower porosity, and a higher grit strength and concentration, but the grinding forces produced were relative higher.

Info:

Periodical:

Advanced Materials Research (Volumes 264-265)

Main Theme:

Advances in Materials and Processing Technologies II

Edited by:

M.S.J. Hashmi, S. Mridha and S. Naher

Pages:

937-942

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.264-265.937

Citation:

S.Y. Luo et al., "Analysis of the Vitrified CBN Wheels for the Performance of Grinding Hardened Steel", Advanced Materials Research, Vols. 264-265, pp. 937-942, 2011

Online since:

June 2011

Authors:

S.Y. Luo, S.Q. Wu, F.J. Hsu

Keywords:

Grinding Force, Grinding Ratio, Surface Roughness (SR), Vitrified CBN Wheel

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$38.00

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References

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Paper TitlePages

Precision Grinding of SUS304 Using Metal Bonded CBN Wheel

Authors: Y. Hasuda, Y. Suzuki, Y. Tadokoro, S. Kinebuchi, T. Ohashi, T. Furusawa

Abstract: The fundamental experiment of the grinding of the stainless steel using the metal bonded CBN wheel which was excellent in wear resistance was conducted. The most appropriate grinding conditions were obtained by clarifying wear process of grinding wheel and finished ground surface quality. When grinding was carried out up to stock removal 7000mm3/mm, radial wear of grinding wheel %R is 3μm and surface roughness Rz was 0.5μm or less. The grinding ratio Gr becomes about 3000, and long life grinding with little change of surface roughness was possible.

261

Experimental Research of Grinding Force and Specific Grinding Energy of TC4 Titanium Alloy in High Speed Deep Grinding

Authors: Xiao Min Sheng, Kun Tang, Jian Wu Yu, Hai Qing Mi

Abstract: Focusing on the characteristic of hard-to-grind for titanium alloy, experiments were conducted about grinding TC4 titanium alloy under high speed deep grinding (HSDG) condition. The changing of grinding force per unit area with maximum undeformed chip thickness hmax and equivalent cutting thickness aeq are analyzed in this paper. The effect of maximum undeformed chip thickness hmax and specific material removal rate Zw' on specific grinding energy es, material removal mechanism and consumption of grinding power in HSDG process are also discussed. The experiment results reveal that application of HSDG can improve machining efficiency of grinding TC4.

Research on CBN Grinding Wheel Dressing with Ultrasonic Vibration Assistance and its Grinding Performance

Authors: Guo Fu Gao, Bo Zhao, Yu Li, Jing Lin Tong

Abstract: The experiment of resin-bonded CBN wheel dressing using a diamond dresser assisted with longitudinal ultrasonic vibration along the direction of depth of cut was carried out and the dressing characteristics and grinding performance were discussed in the present paper. The influence of acoustic parameters on the topography of CBN wheel was studied to check the effectiveness of dressing for this method. The experimental results showed that the higher the ultrasonic frequency is, the better the wheel topography. The grinding on K9 optical glass and high speed steel has achieved higher G-ratio than that of traditionally mechanical dressed CBN grinding wheel. The ground surface of high speed steel is better than that of K9 optical glass. According to the interferometer images, it was concluded that the grinding of high speed steel was in ductile cutting regime, while removal of K9 optical glass was in brittle fracture regime.

126

Experimental Study on Grinding of a Nickel-Based Alloy Using Vitrified CBN Wheels

Authors: Zhong De Shi, Amr Elfizy, Benoit St-Pierre, Helmi Attia

Abstract: An experimental study is reported on the grinding of a nickel-based alloy using vitrified CBN wheels. This work was motivated by switching the grinding of fir-tree root forms of jet engine blades from creep-feed grinding with conventional abrasive wheels to vitrified CBN wheels. The objective is to explore process limits and practical grinding parameters for judging the switch in terms of overall costs and productivity. Straight surface grinding experiments were conducted with water-based fluid on rectangular blocks at a fixed wheel speed v_s = 45 m/s, various depths of cut a = 0.05 - 1.0 mm, and workspeeds v_w = 2 - 40 mm/s. Grinding power, forces, surface roughness, and radial wheel wear were measured. Specific material removal rate of 8 mm³/(mm.s) was reached in rough grinding using a wheel dressed for achieving surface roughness R_a = 0.8 µm in finish grinding. It was found that shallow depths of cut combined with fast workspeeds, or less creep-feed modes, are more suitable for achieving high material removal rates with vitrified CBN grinding. Rough grinding is restricted by high grinding temperatures with newly dressed wheels and by chatters with worn wheels.

134

Study on the Effects of Abrasive and Coolant-Lubricant Types on Minimum Quantity Lubrication-MQL Grinding

Authors: Taghi Tawakoli, M.J. Hadad, A. Daneshi, M.H. Sadeghi, B. Sadeghi

Abstract: In dry grinding, as there is no coolant lubricant to transfer the heat from the contact zone, generation of surface damages are not preventable. Promising alternatives to conventional flood coolant applications are also Minimum Quantity Lubricant (MQL) or Near Dry Machining (NDM) or Semi Dry Machining (SDM). This research has been conducted to study the influence of the abrasive and coolant-lubricant types on the minimum quantity lubrication (MQL) grinding performance. One type of CBN and three types of conventional wheels (corundum) were tested. The tests were carried out in presence of fluid, air jet and eleven types of coolant-lubricants, as well as in dry condition. The results indicate that the finest surface quality and the lowest grinding forces could be obtained when grinding with CBN wheels. In the case of conventional wheels, the coarser wheel induces much proper grinding results.

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