金刚石与磨料磨具工程

Simulation analysis and optimism design on cutter parameters of PCD saw blades

DENG Fuming, LIU Jialin, DENG Wenli, KONG Lingyin, YAN Xiao, LU Xuejun

2016, 36(2): 1-5. doi: 10.13394/j.cnki.jgszz.2016.2.0001

Abstract(326)

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Abstract:
The cutter parameters of PCD wood cutting circular saw blades play a decisive role in the cutting process.They directly affect the machining surface quality and tool life.Simulation analysis of the cutting force and deformation of different cutter parameters of PCD wood circular saw blades is carried out using finite element method.The results show that the stress concentrate in the back area and root area of the cuter,the maximum deformation take place in the cutting velocity direction and the best cuter parameters of the PCD circular saw blades are rake angle γ 15° and rear angle α 15°.

Study on chemical mechanical polishing of 304 stainless steel sheet based on alkaline polishing slurry

CHEN Jiapeng, CHEN Shaokun, LI Qing, QIN Hongquan, SU Jianxiu

2016, 36(2): 6-9,23. doi: 10.13394/j.cnki.jgszz.2016.2.0002

Abstract(324)

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To improve the effect of chemical mechanical polishing(CMP),the influence of oxidant and pH value on the material removal rate(MRR)and surface roughness has been studied.The results show that different oxidants obtain maximum MRRs at different optimal pH values,namely 181nm/min for hydrogen peroxide at pH=9,177 nm/min for chromic oxide at pH=11,172 nm/min for sodium dichromate at pH=11,and 147 nm/min for sodium hypochlorite oxidant at pH=11.It is also shown that the type of oxidant,the content of oxidant and the pH value in CMP slurry have little influence on the surface roughness of stainless steel in CMP 304 stainless steel.Due to high MRR,hydrogen peroxide and chromic oxide can be used as oxidants of alkaline slurry for polishing 304 stainless steel.

Effect of machining allowance on machining quality in honing nickel-base superalloy

DONG Hongliang, YANG Zhangyong, GAO Shaowu, FU Yucan, ZHOU Xiaowei, LIU Zhong

2016, 36(2): 10-14. doi: 10.13394/j.cnki.jgszz.2016.2.0003

Abstract(212)

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For typical difficult-to-machine materials of nickel-base superalloy GH4169,honing experiments are carried out to study the hole surface roughness and cylindricity.Resultsshow that the surface roughness decreases gradually and tends to be stable as honing continues when honing GH4169 using metal bonded CBN oilstone.The best surface roughness is R_a 0.7 μm when using the grit size 100 μm oilstone,R_a 0.3 μm using 34 μm oilstone and R_a 0.1 μm using 8 μm oilstone.Based on the results,two prediction models,namely the minimum bottom hole machining allowance prediction model and the maximum allowable deviation of cylindricity prediction model,are established and verified by relevant experiments.It turns out that the errors of the models are less than 10%.

Wear experiment of single brazed diamond abrasive

HUANG Wu, SU Honghua, ZHANG Kun, XU Jiuhua

2016, 36(2): 15-18. doi: 10.13394/j.cnki.jgszz.2016.2.0004

Abstract(287)

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The wear characteristics of diamond and CBN grit are studied using single grit test with carbon steel plate wheel as dressing tools.The results show that the relative velocity of grinding wheel to dressing wheel has an important effect on wear of diamond grits.The abrasive wear reaches 50.1 μm when the relative velocity is 51.9 m/s,and decreases to 19.5 μm as the relative velocity is 17.3 m/s.After comparing grit wear characteristics of diamond and CBN,it can be concluded that chemical interaction between diamond grits and dressing wheel occurrs in the process of diamond grits wear,which accelerates the wear of diamond grits.Graphite material is not detected on the dressed grit using Raman spectra analysis.

Simulation of micro contact based on interacting force in self rotating grinding of silicon wafer

REN Qinglei, WEI Xin, XIE Xiaozhu, HU Wei

2016, 36(2): 19-23. doi: 10.13394/j.cnki.jgszz.2016.2.0005

Abstract(335)

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Self rotating grinding with cup diamond wheel is a typical ultra precision grinding process for silicon wafer.The simulation model based on the force of micro contact between wheel micro unit and silicon wafer is established from the stable ductile grinding process.Micro contact process of self rotating grinding is simulated using the analysis software LS-DYNA.The stress-strain results between silicon wafer and wheel micro unit are analyzed using finite element method.The results show that there exist critical displacements and loads of elastic-plastic and plastic-brittle transitions when processing silicon wafer.During the tangential sliding in plastic zone,plastic grooves and uplifts appear on silicon surface.Wear of wheel micro unit can be judged based on the simulation data.The research provides support for wafer grinding and wheel wear mechanism.

Preparation of nanocrystalline diamond film vacuum window

GAO Pan, MA Zhibin, WU Chao, WANG Chuanxin, FU Qiuming, WANG Jianhua

2016, 36(2): 24-26,36. doi: 10.13394/j.cnki.jgszz.2016.2.0006

Abstract(329)

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A new nanocrystalline diamond film is prepared in C₂H₆O/H₂ using self-made microwave plasma chemical vapor deposition(MPCVD)system.The nanocrystalline diamond film is deposited on the surface of(100)-oriented Si wafer.Then a nanocrystalline diamond vacuum window is achieved after the silicon wafer is corroded by a mixture of nitric acid and hydrofluoric acid.The morphology,grain size,microstructure,orientation or texture,and crystalline quality of the diamond samples are characterized by scanning electron microscopy(SEM),X-ray diffraction,micro-Raman spectroscopy,and atomic force microscopy(AFM).The final window has a thickness of 15 μm,with surface roughness of R_a 39.5 nm and grain size of 30 nm.According to self-made leakage rate system,the air leakage rate of this vacuum window is 8.8×10^-9 Pa·m³/s.

Research on resin diamond wire made in China

WANG Xuefeng, LI Yaozheng, WU Donggang, WANG Haibin

2016, 36(2): 27-31. doi: 10.13394/j.cnki.jgszz.2016.2.0007

Abstract(250)

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By comparing the performance of steel wire samples made in China and abroad,a Chinese steel wire for experiment is selected.Based on this steel wire,surfactant and acid used in surface treatments are selected.Finally,resin diamond wires are produced with domestic and foreign steel wires respectively,the performance of which is compared.The results show that the components and performance of No.3Chinese steel wire are close to those of foreign steel wire.Surface treatment effect is better after treated using AEO-9and phosphoric acid.The resin diamond wire produced with domestic steel wire can satisfy the quality standard of foreign steel wire and meet application requirements.

Contrastive study on diamond wire saw cutting with/without ultrasonic vibration

ZHANG Liaoyuan, ZHAO Yan, MA Kangle, SHANG Mingwei

2016, 36(2): 32-36. doi: 10.13394/j.cnki.jgszz.2016.2.0008

Abstract(270)

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Abstract:
On the basis of a large number of literatures summarized,processing experiment is carried out using diamond wire saw to cut workpieces with/without ultrasonic vibration.The results show that with the increase of linear velocity,sawing force becomes smaller and that with the increase of feed speed sawing force becomes bigger.Compared with sole diamond wire saw cutting,ultrasonic diamond wire saw machining's sawing force is smaller and its straightness of process track is better,with smaller surface roughness value and better surface quality.

Research on drilling technology of quartz fiber reinforced ceramic matrix composites

RAN Chong, LU Shouxiang, WANG Dongpo, ZHAO Tong, GAO Hang

2016, 36(2): 37-42,48. doi: 10.13394/j.cnki.jgszz.2016.2.0009

Abstract(326)

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Abstract:
For the existing troubles of carbide tool(serious tool wear,poor machining quality,low efficiency)when processing quartz fiber reinforced ceramic matrix composites,cutting force effect on the hole quality is analyzed in this paper by comparing the machining effects of carbide tool,PCD tool and electroplated diamond core drilling tool.The results show that the influence of weft fiber on the cutting force of X and Y direction is more obvious than that of warp fiber.The cutting force perpendicular to the weft fiber is smaller while the cutting force in parallel with the weft fiber direction is bigger.Moreover,the hole quality drilled by PCD tool is relatively better and the tool wear is not obvious,so PCD tool is suitable for processing the quartz fiber reinforced ceramic matrix composites.

Research on drill-grinding silicon nitride ceramic with thin-wall brazed diamond drill

DING Jin, DONG Hai, BAI Hepeng, ZHANG Ye

2016, 36(2): 43-48. doi: 10.13394/j.cnki.jgszz.2016.2.0010

Abstract(253)

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Silicon nitride ceramic was drill-ground with single-layer brazed diamond thin-wall drill.Firstly,the removal mechanism of silicon nitride ceramic was studied,which mainly included brittle removal and ductile regime removal,and brittle removal was the main removal mechanism.Secondly,the influence of wall thickness,spindle speed and drilling pressure on the machining efficiency was studied.The results showed that three parameters all had optimal values,namely 1.5 mm,710 r/min and 613 N respectively.Wall thickness should not exceed 2 mm,the spindle speed no more than 900 r/min,and the drilling pressure should be within the range of 500 to 705 N.If the drilling pressure was less than 330 N,the cutting tool would slip.

Effect of nanometer Ti(C,N)on property of vitrified bond for CBN abrasives

CHEN Feixiao, ZHAO Zhiwei, HU Wenmeng

2016, 36(2): 49-54. doi: 10.13394/j.cnki.jgszz.2016.2.0011

Abstract(288)

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Na₂O-Al₂O₃-SiO₂-B₂O₃ based vitrified bond was selected as the main research subject.Vitrified bond for nanometer titanium carbonitride could be obtained by adding 2%,4%,6% and 8%mass fraction nano-Ti(C,N)into the basic glass material.The flexural strength values were gained by CMT4504 electronic multifunctional tester. Furthermore, differential thermal analysis and microstructure of vitrified bond for nanometer Ti(C,N)were examined by LCP-1poor thermal expansion and Stemi 2000-C electron microscope,respectively.The results showed that after being added to 2%,4%,6% and 8% mass fraction nano-Ti(C,N),the mobility of the vitrified bond was about 179.80%-193.33% and the values of bending strength were among 33.55-116.38 MPa.The comprehensive performance of vitrified bond with 6% mass fraction nano-Ti(C,N)was optimal.Compared with basic glass material,its bending strength and mobility increased by 39.92 MPa and 22.9%,respectively,with performance greatly improved.

Experimental study on cutting depth of hard alloy by abrasive water jet

SONG Jinlai, GUAN Yancong, ZHAO Hongwei, SUN Yanbin

2016, 36(2): 55-59. doi: 10.13394/j.cnki.jgszz.2016.2.0012

Abstract(302)

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By cutting experiments of hard alloy using high pressure abrasive water-jet,the influences of jet pressure,cutting speed,abrasive flow rate and target distance on the cutting depth are analyzed using single factor method.Based on the single factor tests,the levels of these factors are selected for orthogonal test,and the processing parameters are optimized by range analysis.The results show that the influence of factors on the cutting depth ranks as following:jet pressure>cutting speed>abrasive flow>target distance.And the optimal processing parameters are jet pressure 280 MPa,cutting speed 50.8 mm/min,abrasive flow rate 545 g/min,target distance 5 mm.The cutting depth can reach the best under the optimal parameters,which is 0.70 cm.

Optimized design of reduction angle of PCD wire drawing die based on energy consumption calculation

LU Xuejun, LIU Jialin, KONG Lingyin, WANG Ruixue, DENG Fuming

2016, 36(2): 60-63. doi: 10.13394/j.cnki.jgszz.2016.2.0013

Abstract(310)

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In die drawing,the energy consumption of compress deformation and friction is analyzed,as well as that of velocity change at the diameter transition zone in the process of wire drawing.The upper bound theorem is applied to derive the formula of the above three energy consumption in drawing process,then the formula of the total energy consumption in drawing process is derived,and the best reduction angle of polycrystalline diamond drawing die for drawing ϕ0.12 mm steel wire is calculated out.The results show that the best reduction angle and the minimum drawing force of polycrystalline diamond drawing die are α=3.675° and F=2.49 Nseparately.when drawing ϕ0.12 mm steel wire

Research on reasonable parameters to process ceramic material with diamond tools

SUN Lingfu, ZHAN Zhongxue, LIU Guozhong, SUN Quanxi, LIU Zelin, LI Haibao, ZHENG Hongwei

2016, 36(2): 64-66. doi: 10.13394/j.cnki.jgszz.2016.2.0014

Abstract(335)

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When used to drill ceramic,diamond tools tend to convulse if rotation reaches a certain speed leading to blade failure and tool damage.To fix this problem,three kinds of cutting tools,namely φ24,φ60 and φ90 mm,are experimented to obtain the rotation speed before broken.Resultsshow that the optimum rotation speed increases as the radius of tools increases.It is concluded that for φ24 mm tool,the rotation speed is among 1500 to 1650 r/min,and 1650-1720 r/min and 1700-1800 r/min for φ60 and 90 mm tools separately.Furthermore,properly increasing the infeed speed would enhance the efficiency in condition of reasonable rotation speed.

Study on hot pressing sintering behaviors and properties of Cu-Sn pre-alloy powder high Sn content

CAO Caiting, LIU Yibo, XU Liang, SHEN Ningning, LIU Zhihai

2016, 36(2): 67-72. doi: 10.13394/j.cnki.jgszz.2016.2.0015

Abstract(361)

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In order to study the influence of sintering process on the properties of Cu-Sn pre-alloy powder with high Sn content,orthogonal experiment was carried out.The influence factors and optimal parameters were determined using range analysis method,and the experimental results were compared using SEM,microstructure observation and mechanical property tests,etc.The results showed that as with density,hardness and wear resistance of the samples sintering temperature had the biggest influence,followed by holding time and pressure while as with bending strength of the samples,sintering temperature came first,followed by pressure and holding time.It was shown that when the sintering parameters were 440℃,180 sand 10 MPa,the properties was better,which could be optimal experimental program.

Research on composition analysis of metal bond superabrasive products

LUO Miaodi, WANG Juntao, BAO Hua, ZHANG Yi, QIAO Qian

2016, 36(2): 73-77. doi: 10.13394/j.cnki.jgszz.2016.2.0016

Abstract(386)

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Chemical analysis is qualitative,quantitative and structural analysis on the complex mixture,which is characterized by combining a variety of methods of separation and analysis,namely "comprehensive analysis".This comprehensive analysis is the most exploratory and challenging scientific discipline.At present,with the popularization of various kinds of large-scale advanced instruments,chemical analysis technology develops rapidly and is widely applied to various industries.Based on conventional chemical analysis and atomic emission spectrum,scanning electron microscope,energy spectrum and X-ray diffraction instrument,a set of relatively complete chemical analysis method is summarized,so as to provide reference for the industry technical personnel in product development and quality control.

Progress and development on impregnated diamond bit for ultrahard compact and weak-abrasion rock formation

WANG Jialiang, ZHANG Shaohe

2016, 36(2): 78-83,88. doi: 10.13394/j.cnki.jgszz.2016.2.0017

Abstract(339)

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The diamond bit trends to slip when drilling ultra-hard compact and weak-abrasion rock formation.This paper analyzes the characteristic of ultra-hard compact and weak abrasion rock formation,expounds the reason of bit slipping and introduces the research progress of recent years from 4 aspects,namely matrix formula,bit structure,diamond parameter and production equipment.In addition,the development direction of diamond bit is also summarized and prospected in this paper.

Determination of urotropine in phenolic resin powder used in abrasive tools by infrared spectrometry

SUN Rufang, LUO Miaodi, QIAO Qian, CHEN Feng, BAO Hua, ZHANG Yi

2016, 36(2): 84-88. doi: 10.13394/j.cnki.jgszz.2016.2.0018

Abstract(281)

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There is high sensitivity of infrared spectrum for urotropine and no interference between the infrared absorption peaks of urotropine(1007 cm^-1)and commercial phenolic resin powder(1509 cm^-1).So,it is feasible to determine the content of urotropine in phenolic resin powder used in abrasive tools by infrared KBr tabletting method.The content of urotropine in phenolic resin powder is analyzed quantitatively by external standard method(ESTD)and internal standard method(ISTD)respectively and also compared with chemical titration method(perchloric acid titration).The results show that the relative standard deviation of the content determination of urotropine in phenolic resin powder by infrared spectrometry is less than 2%.The accuracy of this method meet the requirement of GB/T24412-2009.This method is simple and reliable,which can be applied to measure the content of urotropine in phenolic resin powder for abrasives industry.

2016 Vol. 36, No. 2

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