• Title/Summary/Keyword: grinding

Search Result 1,953, Processing Time 0.022 seconds

A Study on the Monitoring System of the Grinding Troubles Utilizing Neural Networks(l) (신경회로망을 이용한 연삭가공의 트러블 인식에 관한 연구(I))

  • Ha, M.K.;Kwak, J.S.;Song, J.B.;Kim, G.H.;Kim, H.S.
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.13 no.9
    • /
    • pp.149-155
    • /
    • 1996
  • Recent researches in the trouble monitoring system of grinding process have emphasized the use of deep knowledge. Such works include the monitoring and diagnostic systems for cylindrical grinding using sensors on chatter vibration and grinding burn during the process. But, since grinding operations are especially related with a lalrge amount of ambique parameters, it is effectively difficult to detect the grinding troubles occuring during the grinding process. In this paper, monitoring system for grinding utilizes the neural networks based on grinding power signatures. The monitoring system of grinding operations, which makes use of PDP neural networks, is presented. Then, the implementation results by computer simulations and experimental data with respect to chatter vibration and grinding burn are compared.

  • PDF

A Study on the Grinding Characteristics of Titanium Alloy (티타늄합금의 연삭특성에 관한 연구)

  • Kim, Sung Hun;Choi, Hwan;Lee, Jong Chan
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.1 no.1
    • /
    • pp.55-62
    • /
    • 2002
  • This investigation reports the grinding characteristics of titanium alloy(Ti-6AI-4V). Grinding experiments were performed at various grinding conditions. The grinding forces were measured to investigate the grindability of titanium alloy with the five different wheels including Green carbide, Alumina, Resin Diamond, Resin CBN and Vitrified CBN. To investigate the grinding characteristics of titanium alloy grinding force, force ratio, specific grinding energy and grinding-ratio were measured. Surface roughness was also measured with tracer and the ground surfaces were observed with SEM Residual stress measurement was conducted on the X-Ray Diffractometer. Force ratio of grinding of titanium alloy was very lower than that of grinding of SKD-11 Surface roughness with Resin Diamond wheel was a little larger and rougher surface than that with other wheels Grinding ratio of titanium alloy was a little lower than that of other materials. Grinding ratio of titanium alloy with Diamond wheel was almost six times larger than that With CBN wheel. As a result of five different wheels, the most excellent wheel in grinding of Titanium alloy was Resin Diamond wheel.

  • PDF

A Study on the Analysis of Surface Characteristics According to intermittent Ratio of Discontinuous Grinding Wheel with Multi-Porous Grooves (다기공 연삭숫돌의 단속비에 의한 표면특성 분석에 관한 연구)

  • Kim, Jeong-Du;Kang, Youn-Hee
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.14 no.6
    • /
    • pp.44-51
    • /
    • 1997
  • Crinding of stainless steel, aluminium alloy, copper alloy, and titanium alloy are difficult to obtain high quality finish, because they have the mechanical properties such as low hardness, high toughness. The low hardness and the high toughness result in the loading of wheel and the poor surface finish. In order to perform the grinding operations for these sorts of materials easily, the discontinuous grinding wheel wiht multi-porous grooves has been newly developed. The multi-porous grooves inthe discontinuous grinding wheel were formed during grinding wheel manufacturing process. In this paper, discontinuous grinding wheels having intermittent ratio 0.66, 0.81 and number of grooves 18,32 have been manufactured and grinding surface characteristics of these grinding wheels for SUS304 have been analyzed. Discontinuous grinding temperature according to intermittent ratiohas been also estimated by simulation. The discontinuous grinding wheels increase the grinding performance considerably. It is desirable to use the discontinuous grinding wheel in grinding the materials with high efficiency and accuracy.

  • PDF

A Study on the Grinding Force of Silicon (실리콘 연삭력에 관한 연구)

  • Lee, Choong-Seok;Chae, Seung-Su;Kim, Jong-Pyo;Lee, Jong-Chan;Choi, Hwan
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.5 no.1
    • /
    • pp.33-38
    • /
    • 2006
  • Silicon has been widely used in electronic parts as a semiconductor equipment. It, however, requires much effort to grind without microcrack and chipping because of its high hardness and brittleness. So far, many studies for the grinding of engineering ceramics have been done, but not for the grinding of silicon. In this paper, a theoretical analysis on the grinding forces is introduced. Grinding experiments were performed at various grinding conditions including grinding directions (Up grinding and Down grinding), table speeds and depth of cuts. The grinding forces were measured to compare at various grinding conditions. The experimental values agree well with theoretical ones.

  • PDF

A Study on the Comparison of Internal Plunge Grinding and Internal Thrust Grinding (내면 플런지 연삭과 스러스트 연삭의 비교)

  • Choi, Hwan;Seo, Chang-Yeon;Seo, Young-Il;Lee, Choong-Seok
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.15 no.1
    • /
    • pp.68-73
    • /
    • 2016
  • In this paper, the grinding characteristics in internal grinding methods(plunge, thrust) were studied with vitreous CBN wheels using machining center. Grinding experiments were performed according to the same material removal rate conditions such as a wheel speed, depth of cut and workpiece speed. And the grinding force, machining error and grinding ratio were investigated though these experiments. Based on the experimental results, the grinding characteristics on internal grinding methods were compared.

Energy Partition to Workpiece in Creep feed Grinding (크맆피드연삭에서 공작물로 유입되는 에너지 비율)

  • 홍순익
    • Journal of the Korean Society of Manufacturing Technology Engineers
    • /
    • v.7 no.6
    • /
    • pp.42-48
    • /
    • 1998
  • This paper is concerned with the heat flux distribution and energy partition for creep-feed grinding. From measurements of transient grinding temperatures in the workpiece sub-surface using an embedded thermocouple, the overall energy partition to the workpiece was estimated from moving heat source theory for a triangular heat flux distribution as 3.0% for down grinding and 4.5% for up grinding. The higher energy partition for up grinding can be attribute to the need to satisfy thermal compatibility at the grinding zone. The influence of cooling outside the grinding zone can be analytically taken into account by specifying convective heat transfer coefficients on the workpiece surface ha ahead of the heat source (grinding zone) and hb behind the heat source. The smaller energy partition together with slightly lower grinding power favors down grinding over up grinding.

  • PDF

Prediction of Form Accuracy during Traverse Grinding of Slender Workpiece Using the Cylindrical Prunge Grinding Data (원통연삭 실험자료를 이용한 트래버스 연삭공정중의 형상예측)

  • 박철우;이상조
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.17 no.3
    • /
    • pp.174-183
    • /
    • 2000
  • Non-Parallelism the axial direction occurs during grinding process of long slender shafts. The reason for the axial error is due to elastic deformation of the components, accumulation phenomenon of the grinding and wheel wear during the grinding process. The accumulation phenomenon, the size generation mechanism and the wheel wear process during traverse grinding result in complicated process at each step on the wheel surface. The grinding system stiffness obtained from the stiffness of the center on the tailstock and the workpiece varing according to the relative position of the wheel and the workpiece. Further more, the value of wheel wear increases as the grinding process advances. The above mentioned issues make the shape generation process during traverse grinding quite complicated. This research analyzes the shape generation process in the direction of the work spindle. First, the formulation of the grinding system stiffness was conducted and the simulation analysis method of the traverse grinding was established. Also, a measuring system for assessing the dimensinal accuracy of the workpiece has been developed.

  • PDF

Evaluation of Wheel Life by Grinding Ratio and Static Force

  • Kwak, Jae-Seob;Ha, Man-Kyung
    • Journal of Mechanical Science and Technology
    • /
    • v.16 no.9
    • /
    • pp.1072-1077
    • /
    • 2002
  • A degree of sharpness in wheel grains affects the surface roughness and dimensional accuracy in the grinding process. If a wheel with dull grains is used, the grinding force is increased and the surface roughness is deteriorated. In ovder to produce a precision component economically, the magnitude of the wear amount in the grinding wheel has to be limited. In this study, experimental evaluation of a wheel life varying with the grinding ratio and static grinding force was conducted. The grinding ratio and grinding force were measured to seek the grinding performance of the WA wheel. The relationship between the grinding ratio and static grinding force was presented.

Fracture of Grinding Wheels and Surface Roughness in Surface Grinding for the various Grinding Wheels and Grinding Conditions (평면연삭에서 숫돌의 종류와 연삭조건에 따른 표면거칠기 및 연삭숫돌의 파괴)

  • 오동석;이병곤;이종훈
    • Transactions of the Korean Society of Machine Tool Engineers
    • /
    • v.10 no.4
    • /
    • pp.118-122
    • /
    • 2001
  • In this study, the variation of surface roughness was tested in surface grinding for the three working materials SM45C, heat-treated SM45C, and gray cat iron. IT was performed for the various grinding wheels with two grain size #60, #100, and three grade I, O, R and various grinding depths and feeds, The fractural grinding depths which were obtained when the grinding wheels were destructed in surface grinding works, were examined and compared with the calculated value sug-gested in this study, The results showed that the surface roughness was decreased by decreasing grinding depth, and feed, and increasing grain size and grades. The fracture grinding depths were increased by increasing grain size, grade and feed.

  • PDF

Monitoring of Grinding Wheel Wear in Surface Grinding (평면 연삭에서의 연삭 숫돌 마모 모니터링)

  • 주광훈;김현수;홍성욱;박천홍
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2000.05a
    • /
    • pp.613-616
    • /
    • 2000
  • This paper deals with monitoring of grinding wheel wear in surface grinding process. A laser scanning micrometer is used to measure the circumferential shape as well as the axial shape of grinding wheel. The monitoring system is applied to two kinds of grinding methods: plunge and traverse grinding. Through experiments, it is found that measurement of grinding wheel wear reveals information of roughness of ground surface and the adequate dressing time. In addition, monitoring of grinding wheel wear makes it possible to identify abnormal grinding conditions.

  • PDF