摘要:The results have showed that the mechanical properties and corrosion resistance of non solution treatment CF8(304) and CF8M(316) investment austenitic stainless steels with non solution agent addition can reach as highly as that with solution treatment .The Pitting corrosion resistance increases more than 1.5 times
摘要:By taking pure aluminum,K 2TiF 6 and KBF 4 as raw materials,the fine TiB 2 and Al 3Ti particles with homogeneous distribution in Al Ti B master alloy have been gotten by in situ synthetic reaction having remarkable grain refining effect on Al and Al Cu system alloys series and increasing greatly mechanical properties of ZL201 alloy.
摘要:Rapid prototyping manufacturing in ice pattern and the key technology of substituting ice pattern for foundry pattern/wax pattern to produce ceramic mold/investment casting are introduced.
摘要:In this paper the design and manufacture of the complex tools for foam pattern in lost foam process were described by taking a typical part as an example.The result showed that not only the efficiency of the die design and manufacture was improved and the task was accomplished satisfactorily,but also the die′s quality was ensured fairly and earned consumer′s favorable comment by using CAD/CAM technology.
关键词:Lost foam process;Die for foam pattern;CAD/CAM
摘要:A novel and effective phosphorus modifier——PM is studied.The results show that PM has a good modification effect on Al 20Si hypereutectic alloy.Before modification,the primary Si phase with bulky hexagonal plate and eutectic Si phase with coarse acicular appearance.Average grain size of primary Si phase is about 250 μm.After modification,both primary Si phase and eutectic Si phase appear nubbly and club shaped respectively.Average grain size is 4050 and 2030 μm in dry sand mold and permanent mold respectively.Hydrogen content decreases in the melt with PM modification treatment and the mechanism of PM modification is analysed.
摘要:Effect of parameters on microstructure and properties of steel/aluminum composite structure was investigated with composite solidificatong method. The results show that steel/aluminum composite structure with good property can be obtained by the iron finite solution in liquid aluminum alloy and iron aluminum mutual diffusion in the interface under the condition of effective technology and composition of aluminum alloy.
摘要:The formation mechanism of Al 2O 3/Al ceramic matrix composite fabricated with pure Al+NaOH through DIMOX technology is investigated by SEM and TEM,thermal gravity analysis and quantitative metallography examination.The composite fabricated with pure Al+NaOH,is denser in microstructure,higher in mechanical properties,faster in growth rate than that fabricated with Al+Mg+Si
摘要:Some considerations and notes were described in design and application of the vibrating table for EPC.Vibratory motors,springs and the structure styles of vibrating table were discussed briefly.The results showed that the tightness of vibratory motor,the strength and rigity of the table frame structure are important factors for the effectiveness of filling and compaction of dry sand under nomal working condition of vibrating table
摘要:Some common defects in 1420 Al Li alloy by direct chill casting are described.The reason for the defect formation are analyzed in combination with characteristic of alloy and approach for decreasing defect is offered.
摘要:The working principle,structure and performance of SHS centrifugal machine and several main considerations in design and manufacture are described.Medium small size ceramic lined composite pipes,50150 mm in external diameters and 100120 mm in length,are made conveniently with SHS centrifugal machine mentioned.
摘要:Working condition of ejector has been analyzed and a more rational calculation formula for ejector diameter has been given on the basis of principle of rigidity reliability design.
摘要:According to service life of supporting tile in bearing installation of revolving kiln, ZA27 alloy is substituted for ZQA19\|4 alloy to manufacture supporting tile. Qualified castings is produced on the basis of designing proper cast technology for supporting tile through analyzing cast features for ZA27 alloy. ZA27 alloy supporting tile has better wear\|resistance, longer service life, lower cost and better economic benefit than ZQA19\|4 alloy supporting tile.
摘要:The high pressure blast furnace gas and coke\|oven gas mixture used for making red copper casting,bronze casting, aluminum casting, zinc base alloy and some brass casting, is introduced. It is noted that high pressure mixed gas has to be used in connection with forced blowing wind for gas combustion chamber to produce qualified casting. Designing calculation of furnace stack and nozzle is studied.
摘要:Vacuum dead\|point has great effect on quality of die castings in vacuum die casting. Earlier or later set vacuum dead point would effect continuous production and decrease gas hole unfavorably. The vacuum dead\|point should be set up at 1520 mm far from press shooting of punch. Casting density could be increased up to 1% in vacuum die casting.
摘要:To take conjugate gradient method to solve the N S equation and continuity equation and volume of fluid method to track the free surface, the counter gravity filling pattern of thin plate casting is simulated. Influence of thickness, ingate geometry and number on filling pattern is studied. The results showed that the thinner the plate is, the more the filling patterns tend to be straight filling, and it is natural to meet the requirement for rapid and smooth filling of thin plate. Expanding ingate enhance straight filling tendency and make the free surface more stable and improve the temperature distribution. More ingates can also improve the filling pattern.
摘要:Hot tear formation mechanism and the evaluating methods of the hot tear susceptibility for cast alloys are overviewed and analyzed comprehensively.The strength theory,dendritic bridging theory,solidification shrinkage reparing theory and CSC criterion,HCS criterion are stressed.Some suggestions on the further developments of hot tear theory are offered.
摘要:Several methods on joining of ceramic/metal are reviewed.The joining of ceramic/metal brazing,partial transient liquid bonding and SHS welding on power engineering and high\|temperature composite of advanced jet engine,are emphasized.
摘要:Monoblock casting for the large buddhism statues in art casting has great difficult,especially for the head statue.To resolve the defaults easily formed in the head statue located in pouring inconveniently position,a practical processing design is determined through analyzing existing problem and the head statue is got successfully.The experience of monoblock casting for the large buddhism statue is accumulated.
摘要:The precious reticulated bronze pot with gold and silver inlay unearthed at Xuyi site in Jiangsu province of China is introduced. The pot is inlaid with gold and silver. The outside cover is composed of dragon and plum blossom designing in openwork. There is horizontal band in the middle upper part of the network. Four beasts with their heads holding rings and four standing beasts are cast on the band alternately. Inscription can be seen on the inside of the open rim and on both the inside and the outside of the circular leg. The production of the pot merges all kinds of craft for bronze casting in Warring States and is the gem of Chinese ancient bronzes.