最新刊期
卷 45 ， 期 1 ， 2025
- “最新研究发现，新型奥氏体不锈钢锤头抗拉强度达595MPa，耐蚀性能提升7倍，适用于废旧铅酸蓄电池破碎机。”摘要：The composition， mechanical properties and corrosion resistance of a certain type of imported hammerhead and a domestic substitute hammerhead for waste lead-acid battery crusher were investigated by means of direct-reading optical spectrum analyzer， metallurgical microscopy， and universal testing machine. On this basis， a novel austenitic stainless steel with the satisfied comprehensive performance was developed through composition design and modification treatment. The results indicate that the tensile strength， yield strength， elongation and corrosion rate of as-cast alloy after modification are 595 MPa， 295 MPa， 31.5% and 0.97 g/（m2·h）， respectively. The tensile strength is slightly higher than that of imported ones， while the corrosion resistance is increased by nearly 7 times， indicating the suitability for hammerhead of waste lead-acid battery crusher.关键词：Waste Lead-acid Battery;Austenitic Stainless Steel;Mechanical Properties;Investment Casting57|24|0更新时间：2025-02-05
Current Recommendation
- “精密铸造技术在航空发动机涡轮叶片制造中发挥关键作用，硅溶胶黏结剂的研究进展为优化性能提供新策略。”摘要：As an advanced near-net shape casting technique， investment casting is widely applied in the manufacturing and production of aero-engine turbine blades. The historical development and recent research progress of silica sol binders for investment casting were reviewed， emphasizing the indispensable role in investment casting. The common modification approaches and mechanisms of silica sol binders for investment casting were given， and potential modification strategies for silica sol to achieve optimized performance were discussed.关键词：Silica Sol;Modification Method;Investment Casting;Binder55|31|0更新时间：2025-02-05
Research·Review
- “在铝合金压铸件检测领域，研究人员提出了一种X射线图像多任务分割算法，有效提高了缺陷和关键位置区域的分割精度。”摘要：In order to meet the requirements of high-accuracy segmentation of internal defects and key locations of aluminum alloy die-casting parts， a multi-task segmentation algorithm for X-ray images of aluminum alloy die-casting parts was proposed. A key position boundary awareness module and a local parameter sharing encoder were designed to improve the feature extraction capability for low-relation tasks. An interactive attention module was proposed to improve the segmentation accuracy of key positions and their boundary areas. Results indicate that the proposed multi-task defect segmentation algorithm can simultaneously segment defect areas and key location areas in X-ray images with an mIoU accuracy up to 42.3 and 82.5， meeting the actual needs.关键词：Defect Segmentation;Aluminum Casting;Multi-task Learning;X-ray Image;Deep Learning35|30|0更新时间：2025-02-05
- “在图像处理领域，专家开发了基于注意力机制的残差卷积神经网络检测软件，实现了铸件表面粗糙度的非接触测量，准确率为87.5%，测量用时0.086秒。”摘要：Surface images of blocks with standard roughness was utilized combined with image processing technology to train a residual convolutional neural network integrated with an attention mechanism. With this core， detection software was developed for the detection of solid castings coupled with an image acquisition module to achieve non-contact measurement of casting surface roughness. The measured accuracy of the castings is 87.5%， with a single measurement of 0.086 s， which quickly and conveniently provides measurement results in actual production.关键词：Machine Learing;Surface Roughness;Image Processing;Convolutional Neural Network61|169|0更新时间：2025-02-05
- “在精密铸造领域，专家构建了快速仿真平台，实现了自动化仿真，大幅提高仿真效率。”摘要：In response to the challenges of complex parameter operations， low simulation efficiency， and lack of systematic summaries in investment casting numerical simulations， a rapid simulation platform of investment casting process for superalloy was established based on pouring surface positioning and automated simulation process technology. The platform integrates the process from CAD design to CAE simulation， integrating functions such as parameterization of gating system， design of casting process parameters， dynamic display of simulation results， and download of simulation reports. Ten types of simulation templates and 237 sets of model libraries were constructed， achiving automated rapid simulations. Taking a certain power turbine casing as instance， simulation model， parameter design variable and optimized prediction criteria were built up in the platform. The simulated prediction results are consistent with actual production defects， and simulation efficiency is significantly improved.关键词：Investment Casting;Rapid Simulation of Casting Process;Template Library23|16|0更新时间：2025-02-05
- “在铸造零件X射线DR图像小目标缺陷检测领域，专家提出了基于YOLOv8的改进方法，显著提高了检测精度。”摘要：Aiming at inconspicuous small target defects in X-ray DR images of casting parts and limited accuracy of existing target detection algorithms， a novel small target defect detection method for casting part DR images based on YOLOv8 was proposed. CLAHE algorithm was utilized to enhance image contrast and highlight defect details. Subsequently， the channels of grayscale images were expanded to add learnable information of deep learning network. Finally， YOLOv8 network was modified by incorporating dilated convolution to extract features with a larger receptive field. SimAM attention mechanism was introduced to emphasize important features， and a small target detection layer was added to obtain larger feature maps. The results reveal that the improved YOLOv8 algorithm achieves a mean average precision （mAP） of 86.1% and mAP@0.5∶0.95 of 52.5%， which is increased by 2.87% and 10.10% than that of the primary model， indicating higher precision in small target defect defection of castings.关键词：Deep Learning;Defect Detection;YOLOv8;Image Processing24|11|0更新时间：2025-02-05
Research·Computer Application
- “最新研究发现，通过合金化元素添加，可优化Au-Cu合金制成的玫瑰金颜色和耐蚀性。”摘要：Ag， Zn， Pd and Ge were added for multicomponent alloying of Au-Cu alloy， and influence of chemical composition on color and corrosion resistance to artificial sweat of rose gold were investigated through orthogonal test. The results indicate that the spectral reflectance of rose gold is increased rapidly in the wavelength range of 510~580 nm， which is then increased slowly with the increase of wavelength. When the wavelength exceeds 700 nm， the spectral reflectance remains high and steady， presenting orange-red to red. Moreover， the spectral reflectance varies with chemical composition. In aspect of improving L* and a*， the optimal chemical composition of Au85 rose gold is 0.2%Ge， 2%Ag， 0.3%Pd， 0.6%Zn and 0Ge， 0.3%Pd， 0.6%Zn and 2%Ag， respectively. From the perspective of improving the impedance and self-corrosion potential in artificial sweat， the optimal maching of Au85 rose gold is 2%Ag， 0.3%Pd， 0.6%Zn. Therefore， the influence of alloying elements on color and corrosion resistance of Au85 rose gold is not exactly consistent， and a comprehensive consideration is required with determining the chemical composition of target.关键词：Sputtering Target;Rose Gold;Chemical Composition;Corrosion-resistance10|11|0更新时间：2025-02-05
- “最新研究发现，Mg2Ca具有异质形核效果，有望在镁合金强韧化中广泛应用。”摘要：The interface energy between Mg2Ca and α-Mg matrix was investigated using first-principles calculations. The surface energy of Mg2Ca （0001） plane is lower than that of α-Mg （0110） surface， and even lower than that of α-Mg （0001） surface. The interface between α-Mg （0001） surface and Mg-terminated Mg2Ca （0001） surface exhibits the highest interfacial adhesion energy and the lowest interface energy （lower than the solid-liquid interface energy of α-Mg of 0.1 J/m2）， indicating the heterogenous nucleation effect of Mg2Ca compared to the α-Mg matrix. Due to its low-cost and non-rare-earth characteristics， Mg2Ca shows promising potential as a strengthening phase for toughening magnesium alloys.关键词：Mg2Ca;Surface Energy;Interface Energy;Strengthening Phase65|6|0更新时间：2025-02-05
- “在提高铸造Al-7Si-0.3Mg-0.3Y合金力学性能领域，研究者通过热处理和设备分析，确定了最佳工艺为530℃×6h+160℃×11.5h，显著提升了合金的抗拉强度和伸长率。”摘要：Heat treatment was carried out to improve the mechanical properties of cast Al-7Si-0.3Mg-0.3Y alloy. The optimal heat treatment process was explored by scanning electron microscope， Vickers hardness tester and other equipments， and the mechanical properties of alloys in as-cast， T5 and T6 states were analyzed. The results indicate that the optimal solid solution process is 530 ℃ × 6 h， where the size of eutectic Si reaches the minimun value with relatively round morphology. When the solid solution time exceeds 6 h， the eutectic Si is coarsened. The tensile strength and elongation of the alloy are increased by 26.7% and 28.5%， respectively， compared with that of ones in as-cast state. The optimum aging process is 160 ℃ × 11.5 h， where hardness of the alloy reaches the peak value， and the tensile strength and elongation are increased by 31.1% and 49.7%， respectively. Therefore， the heat treatment process of the alloy is 530 ℃ × 6 h solid solution + 160 ℃ × 11.5 h aging.关键词：Al-Si Alloy;Solid Solution;Aging;Y Element17|12|0更新时间：2025-02-05
- “在铝合金凝固组织研究领域，专家通过定向凝固试验，揭示了冷却速度对ADC12铝合金组织演变及力学性能的影响，为铝合金材料性能优化提供了新思路。”摘要：Effects of cooling rate on solidification structure evolution and mechanical properties of ADC12 aluminum alloy were investigated through directional solidification experiments. The results indicate that as the cooling rate increases， the dendrite spacing of ADC12 aluminum alloy shows a downward trend and the grain orientation tends to be consistent. When the cooling rate is ≥1.5 ℃/s， the downward trend slows down significantly. With the cooling rate of 15.5 ℃/s， the distance between dendrite arms in the cross and longitudinal section is 18.28 and 18.14 μm， respectively. Grain refinement is helpful to improving the mechanical properties and hardness of alloy， where the tensile strength， elongation and microhardness of ADC12 aluminum alloy reach 280.89 MPa， 1.76% and 98.35 HV， respectively. SEM results reveal that the fracture surface of ADC12 aluminum alloy is transformed from brittle fracture to ductile/brittle mixed fracture as the dendrite spacing decreases， and the amounts of dimples on the fracture are increased.关键词：Directional Solidification;Cooling Rate;ADC12 Aluminum Alloy;Dendrite;Mechanical Properties13|14|0更新时间：2025-02-05
- “最新研究发现，Ce元素能显著提高铬-镍耐热钢的抗高温氧化性能，氧化速率降低40%，有效抑制氧化物脱落。”摘要：The effects of Ce elements on the oxidation behaviour of Cr-Ni heat-resistant steel at 1 000 ℃ were investigated， and the oxides were characterized by scanning electron microscopy and X-rays. The results indicate that the weight gain per unit area of heat-resistant steel is faster in the early stage of oxidation， and the weight gain is gradually stable after a certain time of oxidation with an overall parabolic law， however the resistant high-temperature oxidation of Ce-containing heat-resistant steel is always better than that of Cr-Ni heat-resistant steel without Ce. The maximum oxidation rate of Cr-Ni heat-resistant steel during oxidation is as high as 0.54 g/（m2·h）， while the maximum oxidation rate of Ce-containing heat-resistant steel is only 0.32 g/（m2·h）， which is decreased by 40%. In addition， the presence of Ce element can promote the formation of dense oxide film of heat-resistant steel and effectively inhibit the shedding of oxides， thus improving the resistance to high-temperature oxidation.关键词：Heat-Resistant Steel;High Temperature Oxidation;Oxidation Kinetics;Oxidation Morphology;Cr2O36|15|0更新时间：2025-02-05
- “在材料科学领域，研究者通过分子动力学模拟NiCrAlFe合金快速凝固过程，揭示了冷却速度对合金微观结构的影响，为合金凝固组织控制提供新思路。”摘要：The rapid solidification process of NiCrAlFe alloy at cooling rates from 1×1011 K/s to 1×1014 K/s was carried out by molecular dynamics， and microstructure evolution characteristics of the alloy during solidification process were investigated through average potential energy， radial distribution function， and the largest standard cluster analysis. The results indicate that the critical cooling rate of NiCrAlFe alloy is about 4×1012 K/s， above which the amorphous atoms （TCP atoms） dominate the system， while a large amount of crystallization is generated when the cooling rate is lower than 4×1012 K/s， forming a crystal structure mainly composed of FCC atoms. For the crystallized system， the crystal structure order reaches the optimal at 1×1012 K/s， and a complex five-fold twin structure is formed at 2×1011 K/s， resulting in a lower order degree. Therefore， cooling rate has a significant impact on the solidification microstructure of alloy.关键词：NiCrAlFe Alloy;Rapid Solidification;Microstructure;Molecular Dynamics26|183|0更新时间：2025-02-05
- “在工业纯铝板材屈服行为研究领域，专家采用粘塑性自洽模型分析了屈服轨迹演变，揭示了织构对屈服行为的影响，为改善传统屈服准则和流动理论提供新思路。”摘要：In view of the significant texture and anisotropy of industrial pure aluminum sheet leading to complicated subsequent yield behavior， which is difficult to clarify， the viscous-plasticity self-consistent （VPSC） method was applied to analyze the yield loci of as-annealed aluminum sheet. The microstructure and crystalline orientations were characterized， and the plastic hardening behavior was revealed by tensile tests. On this basis， VPSC model that can accurately describe large deformation behavior of aluminum sheet was established. Subsequently， virtual mechanical tests were performed to predict the evolution law of yield loci. The results reveal that the initial yield loci exhibits a typical polygon shape rather than elliptical owing to the presence of crystal texture. With increasing in deformation， significant tension asymmetry occurs， and subsequent yield loci is polygonization， which even become concave under certain strain-paths. Therefore， the traditional yield criteria as well as the plastic flow theories is incapable of describing large deformation of aluminum， and further modifications are required.关键词：Industrial Pure Aluminum;Plastic Anisotropy;Yield Loci;Viscous-plasticity Self-consistent Model39|93|0更新时间：2025-02-05
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Microstructure， Mechanical and Hydrogen Transfer Properties of V-Ni-Fe Hydrogen Separation Alloys AI导读
“最新研究发现，V-Ni-Fe合金的力学性能和抗氢脆性能随Fe含量变化而异，V85Ni7.5Fe7.5合金表现出优异的塑性和抗氢渗透性能。”摘要：The microstructure， mechanical properties， hydrogen solubility， hydrogen permeability and hydrogen brittleness resistance of V85Ni15-xFex （x = 0， 5， 7.5， 10， 15） alloys were characterized. The results indicate that the V-Ni-Fe alloys are presented as homogeneous bcc-（V） solid solution alloys. The hardness and yield strength of alloys are increased firstly and then decreased with Fe content increasing， and the maximum deformation amount is decreased firstly and then increased. The V85Ni7.5Fe7.5 alloy is different from the general trending， showing low hardness， low yield strength and high plasticity （20%）. The hydrogen solubility and hydrogen permeability of V-Ni-Fe alloys are decreased with Fe content increasing. The hydrogen permeability of V85Ni7.5Fe7.5 alloy is 4.3 time of pure Pd at 400 ℃. The alloys with Fe content higher than 7.5 shows desirable hydrogen embrittlement resistance.关键词：V-Ni-Fe Alloy;Microstructure;Mechanical Properties;Hydrogen Transfer Properties16|9|0更新时间：2025-02-05 - “在铝合金板材剥落腐蚀性能研究中，A、B供应商的7055-T7751铝合金板材均满足AMS4206规范，但A公司板材腐蚀程度大于B公司，相关研究有助于7055铝合金板材研制。”摘要：Exfoliation corrosion properties of 7055-T7751 aluminum sheets from suppliers A and B which both conform to AMS4206 specification were investigated. The texture and micro-zone composition on the surface after exfoliation corrosion was analyzed by SEM coupled with EDS. The results indicate that the properties of both sheets meet EA level， while the exfoliation corrosion of A sheet is deeper than that of B sheet. With the sheet tended to be the centre， the secondary phase containing Fe is increased， leading to the corrosion extent ranks of W/2>W/4>edge for sheet from the same company. Fe and Si impurity content is higher in sheet A， and the amounts of second phases containing Fe elements are greater than that of sheet B. Meanwhile， the extent of exfoliation corrosion behavior of sheet A is greater， resulting in a lower conductivity. The correlational investigation is conductive to the research of 7055-T7751 aluminum alloy sheet and relation between chemical composition， microstructure， conductivity and exfoliation corrosion behavior.关键词：7055-T7751 Aluminum Sheet;Electric Conductivity;Microstructure;Exfoliation Corrosion13|17|0更新时间：2025-02-05
- “在铝合金领域，研究者探究了Sc含量和热处理对Al-Zn-Mg-Cu-Zr-Sc合金性能的影响，发现0.25%Sc添加量合金具有最佳力学与阻尼性能。”摘要：The effect of Sc content and heat treatment process on microstructure， mechanical properties and damping capacity of Al-Zn-Mg-Cu-Zr-Sc alloy were investigated. The nano-sized Al3（Sc，Zr） phases generated by Sc addition could inhibit the recrystallization and grain coarsening of Al-Zn-Mg-Cu-Zr-Sc alloys during heat treatment. However， the minor Sc addition hardly leads to the formation of fine grain structure， while excessive Sc addition has little help to further refine the grains. The alloys with 0.25% Sc addition exhibit desirable mechanical properties and high damping capacity. Alloys suffering solid solution-artificial aging exhibit higher strength， lower ductility， and higher internal friction values compared to those of ones with solid solution-natural aging treatment.关键词：Al Alloys;Heat Treatment;Mechanical Properties;Damping Capacity14|5|0更新时间：2025-02-05
- “在材料科学领域，研究者通过显微镜观察和力学性能测试，发现添加铍元素能显著提高Al-Fe-Cu合金的强度和电导率。”摘要：Microstructure of Al-Fe-Cu alloy before and after Be addition were observed by optical microscope （OM） and scanning electron microscope （SEM）， and the variation of mechanical properties and electrical conductivity were detected by tensile testing machine and double electric bridge method. The results indicate that the amounts of precipitates in the second phase of as-cast and as-homogenized Al-Fe-Cu-Be alloy are increased with fine and dispersive distribution. After cold drawing with a total deformation of 86%，the tensile strength of Al-Fe-Cu-Be alloy reach 161 MPa， which is 37% higher than that of Al-Fe-Cu alloy . After aging at 180 ℃， 210 ℃， and 240 ℃ for 3 h， 6 h， and 9 h， respectively， the tensile strength of Al-Fe-Cu-Be alloy reach up to 175 MPa， and the conductivity is 32.36 MS/m.关键词：Be Element;Al-Fe-Cu Alloy;Microstructure;Aging;Electric Conductivity12|10|0更新时间：2025-02-05
Research·Alloy Performance
- “在材料科学领域，研究人员采用双辊铸轧技术制备Cu-3.2Ni-0.75Si合金，显著细化凝固组织，提升力学性能和电导率。”摘要：Cu-3.2Ni-0.75Si alloy was prepared by twin-roll strip casting and ordinary melting casting， and influence of twin-roll strip casting process on solidification structure， precipitation behavior， and mechanical properties of the alloy was investigated. The results reveal that the twin-roll strip casting process can significantly refine the solidification structure of the alloy. Compared to the grain size of ingot in millimeters， the grain size at the edge of casting strip is approximately 130~180 μm， and the size of small equiaxed crystals at the center is about 15 μm. After common cold rolling and aging process， the precipitates in the ingot are distributed in circular clusters with a diameter of 80 nm， and those in the casting strip are dispersed in the form of rods and discs with a disc diameter of 25 nm or a rod length of about 70 nm. Energy spectrum analysis indicates that the circular precipitate phase is determined as δ-Ni2Si， and rod-shaped precipitate is β-Ni3Si. After aging treatment， the tensile strength， micro-hardness， and conductivity of ingot and strip casting are 487 MPa， 172 HV， 22.33 MS/m and 569 MPa， 213 HV， 26.97 MS/m， respectively.关键词：Cu-3.2Ni-0.75Si Alloy;Twin-roll Strip Casting;Cold Rolling;Aging Treatment;Mechanical Properties11|3|0更新时间：2025-02-05
- “在材料科学领域，研究人员成功制备出铍铝合金导电化学氧化膜层，有效提升材料导电性和耐蚀性。”摘要：The preparation of conductive chemical oxidation film of cast Be-Al alloy was carried out. The formation mechanism of conductive oxide film was analyzed， and the surface protection technology of conductive chemical oxidation of Be-Al alloy was developed. The protective film was generated on the surface of cast beryllium aluminum alloy by conducting chemical oxidation technology. The microstructure of film was observed， and the composition was analyzed， and the wear resistance， electrical conductivity and corrosion resistance were tested. The surface conductivity and corrosion resistance of cast Be-Al alloy can be effectively enhanced by conducting chemical oxidation protection.关键词：Be-Al Alloy;Surface Protection;Conducting Chemical Oxidation;Oxide Film7|10|0更新时间：2025-02-05
- “在空心涡轮叶片铸造领域，专家探究了UGTC47合金与SiO2陶瓷型芯界面反应规律，为提升叶片品质提供解决方案。”摘要：Interfacial reaction easily occurs due to contact of alloy melt with ceramic materials for a long time during the casting process of hollow turbine blades， which affects the quality of blades. The interfacial reaction between UGTC47 alloy and silica ceramic core at 1 530 ℃ for different holding time as well as the formation law was investigated. The component activity and reaction formation heat were calculated by Miedema numerical model to explore the feasibility of interfacial reaction. The results indicate that Hf in UGTC47 alloy substitutes with SiO2 in the ceramic core to form HfO2 layer， and Al is oxidized to form Al2O3 layer. With the reaction proceeding， the thicknesses of both reaction layers are increased from 5.82 μm and 2.31 μm to 11.13 μm and 2.95 μm， respectively.关键词：UGTC47 Superalloy;SiO2 Ceramic Core;Heat Preservation;Thermodynamics;Interfacial Reaction13|5|0更新时间：2025-02-05
- “在轮毂铸件加工领域，专家分析了裂纹缺陷产生的原因，为解决裂纹问题提供解决方案。”摘要：The cause of crack defects generated during the machining of ZL205A wheel hub casting was analyzed by observing macroscopic morphology， fracture morphology， and metallographic structure， combined with mechanical performance testing and chemical composition analysis. The results indicate that the origination of cracks in the casting is attributed to internal defects in the wheel hub casting， combined with the stress generated by the sand core during the solidification shrinkage process and the solidification thermal stress generated in the wall thickness transition area. The cracks are mostly concentrated below the surface of the wall thickness transition area of the castings.关键词：Wheel Hub Casting;ZL205A Aluminum Alloy;Crack17|6|0更新时间：2025-02-05
- “在钛合金铸件领域，专家建立了ZTA15铸态相成分分布预测模型，并通过实验验证了数值模拟结果的准确性。”摘要：A prediction model of as-cast phase composition distribution in ZTA15 titanium alloy castings was established based on numerical simulation temperature field of casting process as well as solidification and cooling database of titanium alloy phase composition. Multiple locations on the actual ZTA15 thin-wall skeleton castings were selected for metallographic observation. Image-Pro Plus 6.0 graphic analysis software was utilized to calculate contents of α phase at each location， which were compared with numerical simulation results to verify the accuracy.关键词：Titanium Alloy;Investment Casting;Phase Composition Distribution11|4|0更新时间：2025-02-05
Research·Alloy Process
- “在桥形支架铸件制造领域，专家设计了底注加缝隙式浇注系统，并通过模拟优化工艺，最终采用3D打印和反重力低压铸造技术成功生产出满足技术要求的铸件。”摘要：Aimed at bridge bracket casting， the gating system with bottom injection and slit was designed， and the casting process was simulated by simulation software. According to the simulation result， casting process was optimized， and 3DP sand mold design as well as 3D sand mold printing were carried out after defect-free simulation. The production was completed by anti-gravity low pressure casting， and gating system process was improved according to the inspection results. The final products meet the technical requirements.关键词：Bridge Bracket Casting;Process Design and Optimization;3DP Sand Mold13|19|0更新时间：2025-02-05
- “在GIS铝合金盖板低压铸造领域，专家通过AnyCasting软件模拟优化工艺，成功消除了铸件缺陷。”摘要：Aiming at the low process yield of original metal mold low pressure casting process of the aluminum alloy cover plate for GIS， the initial design of metal mold low pressure casting process without risers was carried out. With the help of AnyCasting software， simulation analysis and process design optimization were conducted. The simulation results indicate that the filling process of initial process is fine and there are isolated liquid phase zones at the intersection of flange and four bosses or wall during the solidification process， leading to shrinkage and porosity defects. Air-cooled insert was adopted to cast through holes and sealing groove in optimization scheme 1， reducing the processing rate at the injection groove position. After the casting solidification， the size of defects is reduced， while the quantity of defects at the intersection of the flange and wall is significantly increased. Air-cooled copper insert was adopted in optimization scheme 2 to enhance pouring temperature of aluminum liquid to 720 ℃， and defects in the cover plate casting can be eliminated.关键词：GIS;Cover Plate;AnyCasting Software;Filling and Solidification Simulation;Process Design13|11|0更新时间：2025-02-05
- “汽车发动机正时链盖浇注系统研究取得进展，纵向U形浇注系统填充平稳，铸件合格率超96%。”摘要：The structural features and technical requirements of timing chain case for automobile engine were introduced. In view of irregular shape， thin wall and sealing performance requirements， CAE simulation numerical analysis was carried out for three schemes of transverse single-side gating system， longitudinal double-side gating system and U-shaped gating system with the help of AnyCasting software. According to the comprehensive evaluation， the longitudinal U-shaped gating system is the most suitable gating system for timing chain case products due to the smooth filling process， balanced casting temperature field， reasonable solidification sequence and absence of shrinkage tendency. Through mass production verification， the qualified rate of castings reaches over 96%.关键词：Numerical Simulation;Gating System;Timing Chain Case;Die-Casting18|13|0更新时间：2025-02-05
- “在汽车后舱充填研究中，通过Flow-3D模拟和CAE分析优化排溢系统，有效提升U型槽力学性能，伸长率提高30%。”摘要：Using Flow-3D simulation software to fill the initial solution of the product， it is found that there is a quality risk in the U-shaped groove area of the rear cabin castings. Mechanical performance experiments show that the mechanical properties at the U-shaped groove position are unqualified. Further X-ray inspection was conducted to confirm the presence of porosity defects in the U-shaped groove area of the casting. In order to improve the quality in the area of the casting， the overflow system was optimized. The X-ray inspection results based on products by optimized system reveal that the internal structure of the area is dense without obvious porosity defects. Mechanical experiments show that the optimization scheme effectively improve the mechanical properties of the U-shaped groove， and the average elongation is increased by 30%.关键词：Automotive Rear Cabin;Die Casting;Defect Analysis;Intergrated Technology23|6|0更新时间：2025-02-05
Application·Die Casting
- “在新材料领域，玄武岩纤维增强硅溶胶型壳研究取得进展，玄武岩纤维加入量为0.1%、长度为3 mm时，型壳常温抗弯强度和高温强度分别提升54%和42%，高温自重变形量和热导率分别降低54%和16%。”摘要：Basalt fiber was selected as reinforcing fiber of silica sol shell to solve problems such as insufficient strength and heat insulation. The results indicate that the strengthening effect and thermal conductivity of the shell are desirable with the basalt fiber content of 0.1% and length of 3 mm. The bending strength and high-temperature strength of the shell at room temperature reach 3.06 MPa and 17.41 MPa， which are 54% and 42% higher than those of ones without fiber， respectively. Weight deformation amount at high temperature and thermal conductivity reach 1.04% and 0.81 W/（m·K）， respectively， which are 54% and 16% lower than those of ones without fiber.关键词：Basalt Fibers;Silica Sol Shell;Bending Strength;Investment Casting18|3|0更新时间：2025-02-05
- “在发动机预燃室镶块精密铸造领域，专家通过优化浇注工艺，显著降低废品率，提高铸件合格率至91.67%。”摘要：In view of the high rejection rate of engine pre-combustion chamber insert castings formed by investment casting with horizontal pouring process， and defects such as shrinkage cavaties and pits on the top surface of casting， the origination of casting defects in the horizontal pouring process scheme were analyzed. The symmetrical vertical pouring scheme was designed and simulated by ProCAST software， and process parameters including pouring temperature， pouring time and shell preheating temperature were optimized by orthogonal test. The results indicate that the defects of castings are basically completely eliminated under pouring temperature of 1 630 ℃， pouring time of 5 s and shell preheating temperature of 1 100 ℃. After trial production verification， the qualified rate of castings reaches 91.67%.关键词：Engine Pre-combustion Chamber Insert;Investment Casting;Process Optimization;Orthogonal Test16|2|0更新时间：2025-02-05
Application·Investment Casting
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