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排序方式: 共有238条查询结果,搜索用时 15 毫秒
1.
灰铸铁几个关键技术问题的探讨 总被引:2,自引:3,他引:2
对灰铸铁熔炼中的几个关键问题进行探讨:1)锰、硫对灰铸铁力学性能及切削加工性能的影响;2)硬质点颗粒对断屑性能的影响;3)时效处理对高速切削时刀具寿命的影响;4)如何减小高强度灰铸铁的收缩倾向;5)如何生产HT350及更高牌号的灰铸铁。 相似文献
2.
The machinability of S, S-Ca, S-RE, and S-RE-Ca system resulfurized composite free-cutting steels were investigated, where
RE is rare earths, mostly cerium. The experimental results showed that in the low cutting speed range (≤35 m/min), the S-RE
system free-cutting steel had better machinability than the others and that the S-RE-Ca system free-cutting steel exhibited
the best machinability at high cutting speeds. A protective layer capable of preventing diffusion wear was formed on the rake
face of a P30 tool when S-RE-Ca system free-cutting steel was machined in the cutting speed range of 120 to 160 m/min. 相似文献
3.
4.
以硅(Si)粉、六方氮化硼(h-BN)为原料,在氮气(N2)中用燃烧合成(combustion synthesis,CS)气固反应法,原位生成可加工氮化硅/氮化硼(Si3N4/h-BN)复相陶瓷.考察了h-BN不同体积分数(下同)对Si3N4/h-BN复相陶瓷可加工性的影响.结果表明:在实验条件下,Si粉氮化完全,不存在残余的游离Si.Si3N4/h-BN复相陶瓷中以柱状β-Si3N4为主相,β-Si3N4晶粒之间为针状h-BN相.随着h-BN相含量的增加,Si3N4/h-BN复相陶瓷的可加工性提高,抗弯强度先减小后增加.h-BN含量为25%时,Si3N4/h-BN复相陶瓷的抗弯强度最低. 相似文献
5.
An attempt was made to investigate the machinability of Si Cp/Al composites based on the experimental study using mill-grinding processing method. The experiments were carried out on a high-speed CNC machining center using integrated abrasive cutting tool. The effects of combined machining parameters, e g, cutting speed(vs), feed rate(vf), and depth of cut(ap), with the same change of material removal rate(MRR) on the mill-grinding force and surface roughness(Ra) were investigated. The formation mechanism of typical machined surface defects was analyzed by SEM. The experimental results reveal that with the same change of material removal rate, lower mill-grinding force values can be gained by increasing depth of cut and feed rate simultaneously at higher cutting speed. With the same change of MRR value, lower surface roughness values can be gained by increasing the feed rate at higher cutting speed, rather than just increasing the depth of cut, or increasing the feed rate and depth of cut simultaneously. The machined surface of Si Cp/Al composites reveals typical defects which can influence surface integrity. 相似文献
6.
Titanium in the rapidly cooled hypereutectic gray iron 总被引:4,自引:0,他引:4
Y. Lerner 《Journal of Materials Engineering and Performance》2003,12(2):141-146
The effect of titanium on the structure and properties of a rapidly cooled hypereutectic cast gray iron has been studied on
the example of permanent mold (PM) casting. A microstructure study showed that titanium is a relatively strong element in
controlling solidification structure by increasing undercooling and thus promoting type D graphite. The effectiveness of titanium
additions depends on the base iron carbon equivalent (CE) with more pronounced changes in iron with a lower CE. The undercooling
ability of the titanium decreases after exceeding a certain level. Increasing titanium from 0.09–0.12% slightly increases
undercooling in iron with lower CE, but this effect was reduced in a more strongly hypereutectic iron. Alloying with titanium
generally improves tensile strength, but the effectiveness of titanium additions also depends on the base iron CE range. Scanning
electron microscope (SEM) studies revealed that most of the titanium-containing compounds were located in the metallic matrix:
titanium carbides have been found in pearlite, while titanium nitrides and carbonitrides were located in ferrite. The presence
of large amounts of extremely hard titanium-containing compounds, which often appear with steadite in a relatively high phosphorous
content PM gray iron, amplifies the negative effect of titanium on machinability. This study suggests that for optimal combination
of tensile strength/microstructure with good machinability, the titanium content in PM gray iron should not exceed 0.075%. 相似文献
7.
采用Si3N4和SiC作为Al2O3/BN可加工陶瓷的添加剂,考察了添加剂种类和含量对材料力学性能及可加工性能的影响。研究表明,2种添加剂均对调节体系中由于热膨胀失配所引起的人的内应力起到积极的作用。材料的抗弯曲强度随添加剂含量的增加而提高,同时可加工性能略有降低。尤其是Si3N4的加入使体系在热压烧结过程中原位反应生成液相x-Sialon,显著降低了烧结温度,促进材料的致密化。 相似文献
8.
G. Pantazopoulos 《Journal of Materials Engineering and Performance》2002,11(4):402-407
C 38500 is a widely used copper alloy with a great variety of applications from decoration and architecture to mechanical/electrical
engineering. The chemical composition of this alloy offers superior machinability and subsequently increased productivity
in high-speed machining and manufacturing processes. In European countries, this alloy is used primarily as free cutting brass
(CW 614N according to EN 12164: 1998), similar to C 36000 alloy, which is used also for thread rolling. The lower percentage
of Cu compared to C 36000 (nominal 58% instead of 61%) decreases the cost of the raw materials. This paper reports the principal
aspects of microstructure, mechanical properties, and machinability of this alloy in relation to the industrial manufacturing
process used. 相似文献
9.
The precipitation and control of boron nitrogen (BN) inclusions in 42CrMo steel were investigated and their effect on machinability was analyzed. First, the precipitation regularity of BN in 42CrMo steel was studied by theoretical calculation. Then, the machinability of the steel was investigated through contrast cutting experiments, and the composition and cooling rate of the steel were controlled to analyze the variation laws of the size, distribution, and area ratio of BN inclusions. Finally, the results were combined with the machinability of the steel to analyze the relationship among them. It is found that the machinability of the steel is mainly influenced by the diameter and quantity of BN inclusions. Fine and dispersedly distributed BN inclusions are more beneficial for the improvement in machinability of 42CrMo steel than coarse and sparse BN inclusions. 相似文献
10.
Metal matrix composites reinforced by three-dimensional (3-D) continuous network structure reinforcement (3DCNRMMC) are difficult to machine due to serious tool wear and poor surface roughness caused by the brittle and hard reinforcement which interpenetrate into ductile matrix. In order to achieve the approach of low cost of 3DCNRMMC, the machinability of it needs to be understood. The influences of three cutting parameters and volume fraction of reinforcement on cutting force were analyzed in detail. The results indicate that: (1) Due to the brittle phase(s) introduced into ductile matrix of composites, there is a large fluctuation of cutting force causing deterioration of machinability. The fluctuation ranges of cutting forces, initially increase rapidly with the increase of volume fraction of reinforcement and then decrease finally, are largest at the range of the volume fraction of 55–65%; (2) The influence of cutting parameters on cutting force is obvious. With the increases of cutting speed, cutting force decreases gradually unless cutting speed exceeds the value of 209 m/min. Cutting forces increase with increasing feed rate and depth of cut; (3) Owing to the large fluctuation of cutting force, there were some cratered surfaces caused by Si3N4 reinforcement pulling-out and flaking-off. Some brittle phase protruding from the machined surface caused the deterioration of machined surface. 相似文献