• Title/Summary/Keyword: carbide analysis

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Development of Cemented Carbide Industry of China

  • Shao, Peng;Fangling, Zou;Yonggui, Zhou;Huan, Wang
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • 2006.09b
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    • pp.905-906
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    • 2006
  • Through the review of developing course of China cemented carbide industry, the writer of this paper at the first time generalizes it into five stages. The writer analyses China cemented carbide industry present status in aspects of produce technology, product structure, operation and management etc. Mean while by analysis of existed shortages in cemented carbide industry, the write considers that it also has three advantages in resource and scale, industry foundation and categories, market and price, and brought out some suggestion and imagination for the future develpment of China cemented carbide industry.

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Finite Element Analysis for Die Compaction Process of Cemented Carbide Tool Parts (초경공구 성형을 위한 금형압축공정)

  • Hyun ChungMin;Kwon YoungSam;Chung SukHwan;Kim MyoungJin;Ha SangYul;Kim KiTae
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.28 no.8 s.227
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    • pp.1140-1151
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    • 2004
  • This paper reports on the finite elements analysis for die compaction process of cemented carbide tool parts. Experimental data were obtained under die compaction and triaxial compression with various loading conditions. The elastoplastic constitutive equations based on the yield function of Shima and Oyane were implemented into an explicit finite element program (ABAQUS/Explicit) and implicit finite element program (PMsolver/Compaction-3D) to simulate compaction response of cemented carbide powder during die compaction. For simulation of die compaction, the material parameters for Shima and Oyane model were obtained by uniaxial die compaction test. Explicit finite element results were compared with implicit results for cemented carbide powder.

Study on the Development of Sintered Carbide Roller Mold for Reflector(1st) -Analysis of Reflector Geometry and Design of Acute Angle Diamond Wheel System- (반사체 회전금형 초경로울러의 개발에 관한 연구(제1보) -반사체 형상 해석 및 다이 아몬드 예각지석 시스템 설계-)

  • 김정두
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.5 no.2
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    • pp.73-82
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    • 1996
  • A simtered carbide roller mold for reflector which is used for coverof automobile lamp and beacon plate of highway has been developed. The geometry of sintered carbide roller mold has been determined from the analysis of reflector geometry. An acute angle diamond wheel and dressing system also has been designed and developed to manufacture the sintered carbide roller mold.

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Study on the Development of Sintered Carbide Roller Mold for Reflector -Analysis of Reflector Geometry and Design of Acute Angle Diamond Wheel System (반사체 회전금형 초경로울러의 개발에 관한 연구(제1보) -반사체 형상 해석 및 다이 아몬드 예각지석 시스템 설계-)

  • 김동식
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1996.03a
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    • pp.170-176
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    • 1996
  • A Sintered carbide roller mold for reflectors which is used for cover of automobile lamp and beacon plate of highway has been developed. The geometry of sintered carbide roller mold has been determined from the analysis of reflector geometry. An acute angle diamond wheel and dressing system also has been designed and developed to manufacture the sintered carbide roller mold.

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Coating of Cobalt Over Tungsten Carbide Powder by Wet Chemical Reduction Method

  • Hong, Hyun-Seon;Yoon, Jin-Ho
    • Journal of Powder Materials
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    • v.21 no.2
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    • pp.93-96
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    • 2014
  • Cobalt coated tungsten carbide-cobalt composite powder has been prepared through wet chemical reduction method. The cobalt sulfate solution was converted to the cobalt chloride then the cobalt hydroxide. The tungsten carbide powders were added in to the cobalt hydroxide, the cobalt hydroxide was reduced and coated over tungsten carbide powder using hypo-phosphorous acid. Both the cobalt and the tungsten carbide phase peaks were evident in the tungsten carbide-cobalt composite powder by X-ray diffraction. The average particle size measured via scanning electron microscope, particle size analysis was around 380 nm and the thickness of coated cobalt was determined to be 30~40 nm by transmission electron microscopy.

A Study on the critical cooling rate to avoid carbide precipitation in austenitic manganese steels during quenching (고망간 주강품의 열처리시 탄화물 석출방지를 위한 임계 냉각속도에 관한 연구)

  • Kim, Jeong-Tae;Kwahk, Si-Young;Choi, Jeong-Kil;Hong, Chun-Pyo
    • Journal of the Korean Society for Heat Treatment
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    • v.12 no.3
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    • pp.206-214
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    • 1999
  • The effect of cooling rate on carbide precipitation during quenching of austenitic manganese steel was investigated by optical microscopy, image analyzer and numerical analysis. A computer program based on the finite difference method for analyzing heat treatment processes was developed in order to evaluate cooling rates and the possibility of carbide precipitation during quenching. The area ratio of carbide precipitated in the austenite matrix was measured by the image analyzer, and used to determine the critical point of carbide precipitation. Temperature-dependent critical cooling rates at the critical points were calculated using the present simulation program, The calculated results showed a good agreement with the experimental ones.

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Analysis of Bonding Interfaces between Cemented Carbide and Stainless Steel made via Hot Vacuum Brazing (고온 진공 브레이징을 이용한 초경합금과 스테인리스강의 접합 계면 특성)

  • Park, D.H.;Hyun, K.H.;Kwon, H.H.
    • Transactions of Materials Processing
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    • v.29 no.6
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    • pp.307-315
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    • 2020
  • The cemented carbide and stainless steel were bonded using a hot-vacuum brazing method to analyze the bonding interface. Since it is suitable for the hot vacuum brazing, nickel metal was used as a binder among the main components of the cemented carbide, and a new cemented carbide material was developed by adjusting the alloy composition. The paste, which is one of the important factors affecting the hot vacuum brazing bonding, was able to improve brazing adhesion by mixing solder as Ni powder and a binder as an organic compound at an appropriate ratio. Division of the stainless steel yielded a dense brazing result. This study elucidated the interfacial characteristics of wear-resistant parts by bonding stainless steel and cemented carbide via hot vacuum brazing.

Finite element modeling of the vibrational behavior of multi-walled nested silicon-carbide and carbon nanotubes

  • Nikkar, Abed;Rouhi, Saeed;Ansari, Reza
    • Structural Engineering and Mechanics
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    • v.64 no.3
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    • pp.329-337
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    • 2017
  • This study concerns the vibrational behavior of multi-walled nested silicon-carbide and carbon nanotubes using the finite element method. The beam elements are used to model the carbon-carbon and silicon-carbon bonds. Besides, spring elements are employed to simulate the van der Waals interactions between walls. The effects of nanotube arrangement, number of walls, geometrical parameters and boundary conditions on the frequencies of nested silicon-carbide and carbon nanotubes are investigated. It is shown that the double-walled nanotubes have larger frequencies than triple-walled nanotubes. Besides, replacing silicon carbide layers with carbon layers leads to increasing the frequencies of nested silicon-carbide and carbon nanotubes. Comparing the first ten mode shapes of nested nanotubes, it is observed that the mode shapes of armchair and zigzag nanotubes are almost the same.

An analysis of the Wi-Ni Carbide Alloy Diffusion Bonding technique in its application for DME Engine Fuel Pump

  • Chun, Dong-Joon
    • International Journal of Advanced Culture Technology
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    • v.8 no.2
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    • pp.246-251
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    • 2020
  • Dimethyl Ether(DME) engine use a highly efficient alternative fuel having a great quantity of oxygen and has a advantage no polluting PM gas. The existing DME fuel cam material is a highly expensive carbide alloy, and it is difficult to take a price advantage. Therefore the study of replacing body area with inexpensive steel material excluding piston shoe and contact area which demands high characteristics is needed. The development of WC-Ni base carbide alloy optimal bonding composition technique was accomplished in this study. To check out the influence of bonding temperature and time, bonding characteristics of sintering temperature was experimented. The hardness of specimen and bonding rate were measured using ultrasound equipment. The bonding state of each condition was excellent, and the thickness of mid-layer, temperature and maintaining time were measured. The mid-layer thickness according to bonding temperature and maintaining time were observed with optical microscope. We analyzed the micro-structural analysis, formation of bonding specimen, wafer fabrication and fuel cam abrasion test. Throughout this study, we confirmed that the fuel cam for DME engine which demands high durability against velocity and pressure is excellent.

The Cutting Characteristics of Rotary Tools Using Regression Analysis (회귀분석법을 이용한 로타리 공구의 절삭 특성)

  • 심승천;장성민;맹민재;정준기
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2004.04a
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    • pp.105-110
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    • 2004
  • This paper deals with the study of feasibility of rotary carbide tools in the machining of aluminium alloy. A rotary tool holder was designed and manufactured for this work. Experiments were performed using Taguchi methods and regression analysis to analyse the influence of various factors and their interactions on the cutting characteristics of rotary carbide tools during machining. The cutting force is influenced the most featly at the inclination angle. The surface roughness is influenced distinctly at depth of cut. It deduced an equation to predict cutting force and surface roughness. Hence, it could be concluded here that the proposed model agrees with the experimental data satisfactorily.

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