The rheo-diecasting mold filling capacity and the microstructure of the semi-solid A380 aluminum alloy slurry were investigated. The results show that the mold filling capacity was strengthened with increasing pouring...The rheo-diecasting mold filling capacity and the microstructure of the semi-solid A380 aluminum alloy slurry were investigated. The results show that the mold filling capacity was strengthened with increasing pouring temperature or increasing injection pressure. Under certain process parameters, the mold cavity was fully filled. However, the mold filling capacity decreased with increasing holding time. The mold filling capacity was improved with increasing shape factor of primary α(Al) grains; however, the solid fraction and the grain size significantly increased at the same time. In addition, the microstructures along the route of the spiral samples obviously differed. The grain size decreased gradually from the near-end to the far-end, whereas the shape factor increased gradually.展开更多
There exist many problems in producing four-way valve of HPb59-1 alloy for an air-conditioner by traditional solid state hot forging,i.e.larger forming loads,lower material utilization,larger subsequent machining allo...There exist many problems in producing four-way valve of HPb59-1 alloy for an air-conditioner by traditional solid state hot forging,i.e.larger forming loads,lower material utilization,larger subsequent machining allowance and nonuniform microstructure.For this reason,based on the orthogonal test,the semisolid diecasting process of a certain type of four-way valve was simulated with FLOW-3D.The simulation results show that the optimized process parameters are:the pouring temperature of 897.25 ?C,the shot velocity of 2.0 m/s and the preheated die temperature of 260 C.The simulation results demonstrate that the cavity can be filled smoothly and completely,the surface defects are small,the temperature field and the pressure field are uniform,and the casting quality is satisfactory.The effectiveness and availability of applying this technology are well verified by the numerical simulation.展开更多
The effects of slurry temperature, injection pressure, and piston velocity on the rheo-filling ability of semisolid A356 alloys were studied by the reho-diecasting methods. The results show that the slurry temperature...The effects of slurry temperature, injection pressure, and piston velocity on the rheo-filling ability of semisolid A356 alloys were studied by the reho-diecasting methods. The results show that the slurry temperature of the semi-solid A356 aluminum alloy has an important effect on the filling ability; the higher the slurry temperature, the better is the filling ability, and the appropriate slurry temperature for rheo-filling is in the range of 585-595℃. The injection pressure also has a great effect on the filling ability, and it is appropriate to the rheo-filling when the injection pressure is in the range of 15-25 MPa. The piston velocity also has a great effect on the filling ability, and it is appropriate to the rheo-filling when the piston velocity is in the range of 0.072-0.12 m/s. The filling ability of the slurry prepared by low superheat pouring with weak electromagnetic stirring is very good and the microstructural distribution in the rheo-formed die castings is homogeneous, which is advantageous to the high quality die casting. 2008 University of Science and Technology Beijing. All rights reserved.展开更多
Taking AZ91D magnesium alloy as experimental material,the rheo-diecasting process was implemented by combining the self-developed taper barrel rheomoulding(TBR) machine with high pressure die casting(HPDC) machine.Mic...Taking AZ91D magnesium alloy as experimental material,the rheo-diecasting process was implemented by combining the self-developed taper barrel rheomoulding(TBR) machine with high pressure die casting(HPDC) machine.Microstructura characteristics of the rheo-diecasting components were investigated in different processing parameters.Microstructural evolution and solidification behavior of the semisolid slurry during the rheo-diecasting process were discussed,and tensile properties of the components were studied as well.The results show that,with the rotation speed of the internal taper barrel increasing,the microstructure of the components becomes fine with solid particles nearly spherical and uniformly distributed on the matrix.When the rotation speed is 700 r/min,the primary α-Mg particles have an average size of about 45 μm and a shape factor of about 0.81;the primary α-Mg particles become round and homogeneous with shearing temperature increasing,but the average size is slightly larger The solidification of the alloy melt during the rheo-diecasting process is composed of two distinct stages:the primary solidification and the secondary solidification.Compared with the conventional die-casting process,the rheo-diecasting process would improve the tensile properties of the components,especially the elongation by 80%.展开更多
The thixo-diecasting (TDC) process is the combination of semi-solid billet preparation technology and die casting technology. The TDC process not only keeps the characteristics of thixo-forming but also has high eff...The thixo-diecasting (TDC) process is the combination of semi-solid billet preparation technology and die casting technology. The TDC process not only keeps the characteristics of thixo-forming but also has high efficiency and low cost. In the present work, the microstructures and mechanical properties of an AZ91D magnesium alloy prepared by the thixo-diecasting (TDC) process were characterized in as-cast condition. The TDC alloy produced exhibits a unique microstructure containing a-Mg solid solution and/3-Mg^TAI^2 intermetallic compound, and there are some small droplets and a small gray globule with eutectic structure in the primary a-Mg grains. The ultimate tensile strength and elongation of the TDC alloy also increase in comparison with other processes, such as thixocasting. Fracture surface observation shows that a crack mainly originates from the brittle fracture of the eutectic phases. The deformation of ductile a-Mg phase provides the TDC alloy with the main strain.展开更多
The effect of injection pressure, piston velocity, and the forming temperature of semisolid slurry on the filling behavior of the semi-solid A356 aluminum alloy was investigated by simulation methods. The simulation r...The effect of injection pressure, piston velocity, and the forming temperature of semisolid slurry on the filling behavior of the semi-solid A356 aluminum alloy was investigated by simulation methods. The simulation results show that these processing parameters have an important effect on the filling behavior of the semi-solid A356 aluminum alloy. The slurry flows steadily in the cavity when the injection pressure, the piston velocity, and the forming temperature are low, but it is prone to turbulent flow when the injection pressure, the piston velocity, and the forming temperature are much higher. Therefore it is necessary to determine the appropriate processing parameters to get a steady flow of the slurry in the cavity.展开更多
The microstructure and mechanical properties of the rheo-diecasting(RDC) A390 alloy under as-cast and T6 heat treatment conditions were investigated.The results indicate that the RDC sample has fine and uniform micros...The microstructure and mechanical properties of the rheo-diecasting(RDC) A390 alloy under as-cast and T6 heat treatment conditions were investigated.The results indicate that the RDC sample has fine and uniform microstructure throughout the sample under the as-cast condition,and the average size of primary Si spheroids is 20-30 μm.Meanwhile,the intermetallic compounds in RDC sample are reduced.Compared with the alloy produced by conventional liquid die-casting(LDC),RDC samples have improved tensile strength,ductility,hardness and wear resistance.It is also found that heat-treatment of the RDC A390 alloy under T6 condition,can substantially improve mechanical properties,with the tensile elongation more than 100% improvement.展开更多
The 13th China International Diecasting Congress & Exhibition(CHINA DIECASTING 2018) and 2018 China NonferrousAlloys & Special Casting Exhibition (CHINA NONFERROUS2018) were held concurrently July 18-20 at Shang...The 13th China International Diecasting Congress & Exhibition(CHINA DIECASTING 2018) and 2018 China NonferrousAlloys & Special Casting Exhibition (CHINA NONFERROUS2018) were held concurrently July 18-20 at Shanghai NewInternational Expo Centre. The events were co-organized bythe Foundry Institution of Chinese Mechanical EngineeringSociety (FICMES), Shenyang Zhongzhu Foundry ProductivityPromotion Center Co., Ltd. (FPC) and the State Key Laboratoryof Light Alloys Casting Technologies for High-end Equipment.展开更多
A new concept of salt core, a melting temperature of which is lower than the solidus temperature of cast alloy,was introduced to produce an integrated casting part having a complicated inner shape or requiring under-c...A new concept of salt core, a melting temperature of which is lower than the solidus temperature of cast alloy,was introduced to produce an integrated casting part having a complicated inner shape or requiring under-cut in high pressure die casting or squeeze casting process. A salt core, named a fusible core in this paper because the salt core can be easily extracted just as holding at a temperature under a solidus temperature of a casting alloy, was developed and applied to produce a fuel control part for automotive GDI engine in high pressure diecasting machine. A different salt material of a lower melting temperature than that of A1 alloy was mixed with a different ceramic particulate to improve a thermo-physical property of fusible core. The thermo-physical property of the fusible core was measured and a weight faction of the ceramic particulate was optimized. The selected core materials were poured in metallic mold by gravity to produce a fusible core for a fuel control part for automotive GDI engine. The fuel control part, which the fusible core was included inside, was successful to fabricate in a conventional diecasting machine with no melting of fusible core during casting.展开更多
In order to better promote the development of diecasting industry in our country, to boost the application of new diecasting technology and techniques, to improve the competitive power of the diecasting enterprises in...In order to better promote the development of diecasting industry in our country, to boost the application of new diecasting technology and techniques, to improve the competitive power of the diecasting enterprises in our country, to extend the international markets and to improve qualities of diecastings more quickly, the activity of evaluating high quality diecastings was organized by Foundry Institution of Chinese Mechanical Engineering Society (FICMES) during the period of the 5th China International Diecasting Congress & Exhibition. The Excellent Diecastings Evaluation Committee was composed of an independent panel of experts in China’s diecasting industry. In accordance with the evaluation rules of impersonality and impartiality, the Evaluation Committee members, at the site of the exhibition, carefully checked each and all evaluation indexes of the diecastings accepted in the activity, deliberately examined the real diecastings, and inquired of the technicians of the companies taking part in the evaluation activity about the production processes, qualities and other information of the diecastings. After discussion again and again, finally, five diecastings were entitled as the excellent diecastings of the 5th China International Diecasting Conference & Exhibition. They are listed as follows: 1. Shell of PC notebook produced by Ka Shui Manufactory Co., Ltd., Shenzhen, Guangdong, material: magnesium alloy AZ91D. 2. Base of mobile telecom transmitter produced by Guangdong Gaoyao G-ACE Casting Technology Co., Ltd, material: ADC12. 3. Flywheel casing (for Renault trucks) produced by Shanghai Cosmopolitan Automobile Accessory Co., Ltd, material: A380. 4. Strainer case (for Japan Isuzu automobiles) produced by Guangdong Wencan Die Casting Co., Ltd, material: ADC12. 5. Intake manifold of six-cylinder diesel engine. produced by Jinan Huicheng Foundry Co., Ltd, material: AlSi9Cu3.展开更多
On June 28, 2006, during the 5th China International Diecasting Congress, a meeting was held by the Paper Evaluation and Competition Commission under Foundry Institution of Chinese Mechanical Engineering Society to ev...On June 28, 2006, during the 5th China International Diecasting Congress, a meeting was held by the Paper Evaluation and Competition Commission under Foundry Institution of Chinese Mechanical Engineering Society to evaluate excellent papers in die casting for these papers published in Foundry, Special Foundry & Nonferrous Alloys, Foundry Technology journals between Jan. and Dec. 2005 and Proceedings of the 5th China International Diecasting Congress, and recommended by their editorial commissions. After collecting recommendations and opinions from specialist nation-wide, a total of 13 papers were qualified for the final round. After evaluation and voting by the 21 participating member of the commission, one Gold Award and three Silver Awards were finalized and entitled the “Wan Feng” Cup Excellent Paper in Diecasting . The awarded papers are listed as follows:展开更多
An apparent viscosity model of semi-solid A356 aluminum alloy has been developed and the software Castsofl6.0 coupled with the model has been used to simulate the mould filling of an automobile master brake cylinder w...An apparent viscosity model of semi-solid A356 aluminum alloy has been developed and the software Castsofl6.0 coupled with the model has been used to simulate the mould filling of an automobile master brake cylinder with the semi-solid A356 aluminum alloy slurry. The simulation results are in agreement with the practical filling process, indicating that the apparent viscosity model is feasible and can be used to simulate the mould filling of the semisolid A356 aluminum alloy slurry and can be used to optimize the filling process and the design of dies. A higher injection pressure, a higher ingate flow velocity of the semi-solid slurry, and a higher slurry temperature are advantageous to the mould filling of the automobile master brake cylinder.展开更多
The 5th China International Diecasting Congress & Exhibition, organized by Foundry Institution of Chinese Mechanical Engineering Society and Productive Promotion Center of Foundry Industry of China (www.foundrynatio...The 5th China International Diecasting Congress & Exhibition, organized by Foundry Institution of Chinese Mechanical Engineering Society and Productive Promotion Center of Foundry Industry of China (www.foundrynations.com), will run from June 28-July 1,2006. The INTEX SHANGHAI in Shanghai, P. R. China is the venue for the 5th China International Diecasting Congress & Exhibition. The following is some of the exhibitors having entered their names for the Congress & Exhibition.展开更多
The 5th China International Diecasting Congress & Exhibition organized by the Foundry Institution of Chinese Mechanical Engineering Society (FICMES) was successfully held in Shanghai, China on June 28 to July 1, 2...The 5th China International Diecasting Congress & Exhibition organized by the Foundry Institution of Chinese Mechanical Engineering Society (FICMES) was successfully held in Shanghai, China on June 28 to July 1, 2006. The opening ceremony was held in INTEX Shanghai in the morning of June 28. On behalf of the sponsors and the organizer Mr. LI Xin-ya, Vice chairman of China Machinery Industry Federation, Director of FICMES and President of China Academy of Machinery Science & Technology (CAMST), delivered his opening speech. In the speech Mr. LI Xin-ya gave his warm welcome to the honored guests at home and abroad who participated in this activity, and gave his sincere gratitude to the companies and professionals who passionately helped and supported the activity. He made a brief introduction to the current situation of the China diecasting industry and outlooked the bright prospect of the diecasting industry in China. He hoped this activity could facilitate to improve the whole technological level of China diecasting industry, to promote the prosperity of the China diecasting market and to generate new driving展开更多
On November 16, the light alloy precision die-casting project (Phase I) constructed by Chaohu Yi'an Yunhai Technology Co., Ltd. was completed and put into production. The main products are new energy automotive com...On November 16, the light alloy precision die-casting project (Phase I) constructed by Chaohu Yi'an Yunhai Technology Co., Ltd. was completed and put into production. The main products are new energy automotive components, 5G product components and laptop shells. Chaohu Yi'an Yunhai Technology Co., Ltd. is a joint venture funded by Dongguan Yi'an Technology Co., Ltd. and Nanjing Yunhai Special Metals Co., Ltd., with a total investment of CNY 550 million and a building area of 75,000 square meters.展开更多
In this paper, the effects of rheo-diecast process parameters and T6 heat treatment on the microstructure and mechanical properties of the rheo-diecasting(RDC) semi-solid A390 alloy prepared through pure copper serp...In this paper, the effects of rheo-diecast process parameters and T6 heat treatment on the microstructure and mechanical properties of the rheo-diecasting(RDC) semi-solid A390 alloy prepared through pure copper serpentine channel were investigated. The results indicate that the mechanical properties of the RDC samples change with the pouring temperature and injection pressure. In this case, a lower pouring temperature results in better tensile strength and elongation of the RDC A390 alloy; however, the tensile strength and elongation decrease when the pouring temperature decreases to 660°C. Higher injection pressures result in the improved mechanical properties of the RDC A390 alloy. To some extent, T6 heat treatment improves the tensile strength and ductility of the RDC A390 alloy compared to those of the non-heat treated alloy. However, when the pouring temperature and injection pressure are greater than 670°C and 70 MPa, respectively, the mechanical properties are sharply diminished.展开更多
基金financially supported by the National Basic Research Program of China (No. 2011CB606300)the National Natural Science Foundation of China (No. 5077400)
文摘The rheo-diecasting mold filling capacity and the microstructure of the semi-solid A380 aluminum alloy slurry were investigated. The results show that the mold filling capacity was strengthened with increasing pouring temperature or increasing injection pressure. Under certain process parameters, the mold cavity was fully filled. However, the mold filling capacity decreased with increasing holding time. The mold filling capacity was improved with increasing shape factor of primary α(Al) grains; however, the solid fraction and the grain size significantly increased at the same time. In addition, the microstructures along the route of the spiral samples obviously differed. The grain size decreased gradually from the near-end to the far-end, whereas the shape factor increased gradually.
基金Project(50375117) supported by the National Natural Science Foundation of China
文摘There exist many problems in producing four-way valve of HPb59-1 alloy for an air-conditioner by traditional solid state hot forging,i.e.larger forming loads,lower material utilization,larger subsequent machining allowance and nonuniform microstructure.For this reason,based on the orthogonal test,the semisolid diecasting process of a certain type of four-way valve was simulated with FLOW-3D.The simulation results show that the optimized process parameters are:the pouring temperature of 897.25 ?C,the shot velocity of 2.0 m/s and the preheated die temperature of 260 C.The simulation results demonstrate that the cavity can be filled smoothly and completely,the surface defects are small,the temperature field and the pressure field are uniform,and the casting quality is satisfactory.The effectiveness and availability of applying this technology are well verified by the numerical simulation.
基金the National Nature Science Foundation of China(No.50774007)the National High Technology Research and Development Program of China(No.2006AA03Z115)the National Key Basic Research Program of China(No.2006CB605203).
文摘The effects of slurry temperature, injection pressure, and piston velocity on the rheo-filling ability of semisolid A356 alloys were studied by the reho-diecasting methods. The results show that the slurry temperature of the semi-solid A356 aluminum alloy has an important effect on the filling ability; the higher the slurry temperature, the better is the filling ability, and the appropriate slurry temperature for rheo-filling is in the range of 585-595℃. The injection pressure also has a great effect on the filling ability, and it is appropriate to the rheo-filling when the injection pressure is in the range of 15-25 MPa. The piston velocity also has a great effect on the filling ability, and it is appropriate to the rheo-filling when the piston velocity is in the range of 0.072-0.12 m/s. The filling ability of the slurry prepared by low superheat pouring with weak electromagnetic stirring is very good and the microstructural distribution in the rheo-formed die castings is homogeneous, which is advantageous to the high quality die casting. 2008 University of Science and Technology Beijing. All rights reserved.
基金Project (2009DFB50210) supported by the International S&T Cooperation Program of ChinaProject (2006CB605203) supported by the National Basic Research Program of China
文摘Taking AZ91D magnesium alloy as experimental material,the rheo-diecasting process was implemented by combining the self-developed taper barrel rheomoulding(TBR) machine with high pressure die casting(HPDC) machine.Microstructura characteristics of the rheo-diecasting components were investigated in different processing parameters.Microstructural evolution and solidification behavior of the semisolid slurry during the rheo-diecasting process were discussed,and tensile properties of the components were studied as well.The results show that,with the rotation speed of the internal taper barrel increasing,the microstructure of the components becomes fine with solid particles nearly spherical and uniformly distributed on the matrix.When the rotation speed is 700 r/min,the primary α-Mg particles have an average size of about 45 μm and a shape factor of about 0.81;the primary α-Mg particles become round and homogeneous with shearing temperature increasing,but the average size is slightly larger The solidification of the alloy melt during the rheo-diecasting process is composed of two distinct stages:the primary solidification and the secondary solidification.Compared with the conventional die-casting process,the rheo-diecasting process would improve the tensile properties of the components,especially the elongation by 80%.
基金financially supported by the Liaoning Province Magnesium Alloy Protection Program(No.MYF2010-39)
文摘The thixo-diecasting (TDC) process is the combination of semi-solid billet preparation technology and die casting technology. The TDC process not only keeps the characteristics of thixo-forming but also has high efficiency and low cost. In the present work, the microstructures and mechanical properties of an AZ91D magnesium alloy prepared by the thixo-diecasting (TDC) process were characterized in as-cast condition. The TDC alloy produced exhibits a unique microstructure containing a-Mg solid solution and/3-Mg^TAI^2 intermetallic compound, and there are some small droplets and a small gray globule with eutectic structure in the primary a-Mg grains. The ultimate tensile strength and elongation of the TDC alloy also increase in comparison with other processes, such as thixocasting. Fracture surface observation shows that a crack mainly originates from the brittle fracture of the eutectic phases. The deformation of ductile a-Mg phase provides the TDC alloy with the main strain.
基金supported by the National High-Tech Research and Development Program of China(No.2006AA03Z115)the Major State Basic Research and Development Program of China(No.2006CB605203)
文摘The effect of injection pressure, piston velocity, and the forming temperature of semisolid slurry on the filling behavior of the semi-solid A356 aluminum alloy was investigated by simulation methods. The simulation results show that these processing parameters have an important effect on the filling behavior of the semi-solid A356 aluminum alloy. The slurry flows steadily in the cavity when the injection pressure, the piston velocity, and the forming temperature are low, but it is prone to turbulent flow when the injection pressure, the piston velocity, and the forming temperature are much higher. Therefore it is necessary to determine the appropriate processing parameters to get a steady flow of the slurry in the cavity.
基金Project(50775086) supported by the National Natural Science Foundation of ChinaProject(SWJTU09BR149) supported by the Fundamental Research Funds for Central Universities,ChinaProject(2009Q003) supported by Southwest Jiaotong University,China
文摘The microstructure and mechanical properties of the rheo-diecasting(RDC) A390 alloy under as-cast and T6 heat treatment conditions were investigated.The results indicate that the RDC sample has fine and uniform microstructure throughout the sample under the as-cast condition,and the average size of primary Si spheroids is 20-30 μm.Meanwhile,the intermetallic compounds in RDC sample are reduced.Compared with the alloy produced by conventional liquid die-casting(LDC),RDC samples have improved tensile strength,ductility,hardness and wear resistance.It is also found that heat-treatment of the RDC A390 alloy under T6 condition,can substantially improve mechanical properties,with the tensile elongation more than 100% improvement.
文摘The 13th China International Diecasting Congress & Exhibition(CHINA DIECASTING 2018) and 2018 China NonferrousAlloys & Special Casting Exhibition (CHINA NONFERROUS2018) were held concurrently July 18-20 at Shanghai NewInternational Expo Centre. The events were co-organized bythe Foundry Institution of Chinese Mechanical EngineeringSociety (FICMES), Shenyang Zhongzhu Foundry ProductivityPromotion Center Co., Ltd. (FPC) and the State Key Laboratoryof Light Alloys Casting Technologies for High-end Equipment.
文摘A new concept of salt core, a melting temperature of which is lower than the solidus temperature of cast alloy,was introduced to produce an integrated casting part having a complicated inner shape or requiring under-cut in high pressure die casting or squeeze casting process. A salt core, named a fusible core in this paper because the salt core can be easily extracted just as holding at a temperature under a solidus temperature of a casting alloy, was developed and applied to produce a fuel control part for automotive GDI engine in high pressure diecasting machine. A different salt material of a lower melting temperature than that of A1 alloy was mixed with a different ceramic particulate to improve a thermo-physical property of fusible core. The thermo-physical property of the fusible core was measured and a weight faction of the ceramic particulate was optimized. The selected core materials were poured in metallic mold by gravity to produce a fusible core for a fuel control part for automotive GDI engine. The fuel control part, which the fusible core was included inside, was successful to fabricate in a conventional diecasting machine with no melting of fusible core during casting.
文摘In order to better promote the development of diecasting industry in our country, to boost the application of new diecasting technology and techniques, to improve the competitive power of the diecasting enterprises in our country, to extend the international markets and to improve qualities of diecastings more quickly, the activity of evaluating high quality diecastings was organized by Foundry Institution of Chinese Mechanical Engineering Society (FICMES) during the period of the 5th China International Diecasting Congress & Exhibition. The Excellent Diecastings Evaluation Committee was composed of an independent panel of experts in China’s diecasting industry. In accordance with the evaluation rules of impersonality and impartiality, the Evaluation Committee members, at the site of the exhibition, carefully checked each and all evaluation indexes of the diecastings accepted in the activity, deliberately examined the real diecastings, and inquired of the technicians of the companies taking part in the evaluation activity about the production processes, qualities and other information of the diecastings. After discussion again and again, finally, five diecastings were entitled as the excellent diecastings of the 5th China International Diecasting Conference & Exhibition. They are listed as follows: 1. Shell of PC notebook produced by Ka Shui Manufactory Co., Ltd., Shenzhen, Guangdong, material: magnesium alloy AZ91D. 2. Base of mobile telecom transmitter produced by Guangdong Gaoyao G-ACE Casting Technology Co., Ltd, material: ADC12. 3. Flywheel casing (for Renault trucks) produced by Shanghai Cosmopolitan Automobile Accessory Co., Ltd, material: A380. 4. Strainer case (for Japan Isuzu automobiles) produced by Guangdong Wencan Die Casting Co., Ltd, material: ADC12. 5. Intake manifold of six-cylinder diesel engine. produced by Jinan Huicheng Foundry Co., Ltd, material: AlSi9Cu3.
文摘On June 28, 2006, during the 5th China International Diecasting Congress, a meeting was held by the Paper Evaluation and Competition Commission under Foundry Institution of Chinese Mechanical Engineering Society to evaluate excellent papers in die casting for these papers published in Foundry, Special Foundry & Nonferrous Alloys, Foundry Technology journals between Jan. and Dec. 2005 and Proceedings of the 5th China International Diecasting Congress, and recommended by their editorial commissions. After collecting recommendations and opinions from specialist nation-wide, a total of 13 papers were qualified for the final round. After evaluation and voting by the 21 participating member of the commission, one Gold Award and three Silver Awards were finalized and entitled the “Wan Feng” Cup Excellent Paper in Diecasting . The awarded papers are listed as follows:
基金the National High-Tech Research and Development Program of China (No.2006AA03Z115)the Major State Basic Research Development Program of China (No.2006CB605203)the National Natural Science Foundation of China (No.50774007)
文摘An apparent viscosity model of semi-solid A356 aluminum alloy has been developed and the software Castsofl6.0 coupled with the model has been used to simulate the mould filling of an automobile master brake cylinder with the semi-solid A356 aluminum alloy slurry. The simulation results are in agreement with the practical filling process, indicating that the apparent viscosity model is feasible and can be used to simulate the mould filling of the semisolid A356 aluminum alloy slurry and can be used to optimize the filling process and the design of dies. A higher injection pressure, a higher ingate flow velocity of the semi-solid slurry, and a higher slurry temperature are advantageous to the mould filling of the automobile master brake cylinder.
文摘The 5th China International Diecasting Congress & Exhibition, organized by Foundry Institution of Chinese Mechanical Engineering Society and Productive Promotion Center of Foundry Industry of China (www.foundrynations.com), will run from June 28-July 1,2006. The INTEX SHANGHAI in Shanghai, P. R. China is the venue for the 5th China International Diecasting Congress & Exhibition. The following is some of the exhibitors having entered their names for the Congress & Exhibition.
文摘The 5th China International Diecasting Congress & Exhibition organized by the Foundry Institution of Chinese Mechanical Engineering Society (FICMES) was successfully held in Shanghai, China on June 28 to July 1, 2006. The opening ceremony was held in INTEX Shanghai in the morning of June 28. On behalf of the sponsors and the organizer Mr. LI Xin-ya, Vice chairman of China Machinery Industry Federation, Director of FICMES and President of China Academy of Machinery Science & Technology (CAMST), delivered his opening speech. In the speech Mr. LI Xin-ya gave his warm welcome to the honored guests at home and abroad who participated in this activity, and gave his sincere gratitude to the companies and professionals who passionately helped and supported the activity. He made a brief introduction to the current situation of the China diecasting industry and outlooked the bright prospect of the diecasting industry in China. He hoped this activity could facilitate to improve the whole technological level of China diecasting industry, to promote the prosperity of the China diecasting market and to generate new driving
文摘On November 16, the light alloy precision die-casting project (Phase I) constructed by Chaohu Yi'an Yunhai Technology Co., Ltd. was completed and put into production. The main products are new energy automotive components, 5G product components and laptop shells. Chaohu Yi'an Yunhai Technology Co., Ltd. is a joint venture funded by Dongguan Yi'an Technology Co., Ltd. and Nanjing Yunhai Special Metals Co., Ltd., with a total investment of CNY 550 million and a building area of 75,000 square meters.
基金financially supported by the National Basic Research Program Priorities of China (No.2011CB606300)the National Natural Science Foundation of China (No.5077400)
文摘In this paper, the effects of rheo-diecast process parameters and T6 heat treatment on the microstructure and mechanical properties of the rheo-diecasting(RDC) semi-solid A390 alloy prepared through pure copper serpentine channel were investigated. The results indicate that the mechanical properties of the RDC samples change with the pouring temperature and injection pressure. In this case, a lower pouring temperature results in better tensile strength and elongation of the RDC A390 alloy; however, the tensile strength and elongation decrease when the pouring temperature decreases to 660°C. Higher injection pressures result in the improved mechanical properties of the RDC A390 alloy. To some extent, T6 heat treatment improves the tensile strength and ductility of the RDC A390 alloy compared to those of the non-heat treated alloy. However, when the pouring temperature and injection pressure are greater than 670°C and 70 MPa, respectively, the mechanical properties are sharply diminished.