查询词典 preform

Fabricating process of preform and the influence of process parameters on preform were studied.

并研究了预制块的制备工艺。

The three preform growth types, referred to as dolphin, sandpile, and two-bubble, were observed. Then combining the geometry and sizes of the preform, the stresses and temperature distribution on it, and the stress-strain curves of the PET material used, the cause for different perform growth types was systematically analyzed.

发现存在海豚型、积沙型和双泡型三种不同的型坯轮廓演变模式；结合型坯的结构、尺寸、应力分布和温度分布以及所用PET材料的应力-应变曲线，对不同型坯轮廓演变模型的成因进行了较详细的分析。

To make a preform of the tellurite optic fiber, we use a mode to cast the glass and use machining method to get the preform.

通过模具结构设计，采用整体浇铸和机械加工相结合的方法来制作光纤预制棒。

When the height reduction is 25%, the preform processed by SMC-TG is compact basically, and there are many pores in SMC preform. Due to SMC-TG could densify the spray deposited preform effectively, the mechanical property is improve obviously.

由于梯温楔压工艺能提高喷射沉积多孔坯料的致密化效果，因此使梯温楔压试样的力学性能也得到了大幅度的提高。

First, pre-heating the preform; then stretching it with stretch-rod meanwhile blowing it so that the preform becomes the real shape of mold of the bottle; finally, cooling the product and taking it out mold.

本课题所论述的PP瓶的拉伸吹塑成型是采用二步法，即成型好的瓶坯先预热，后用拉伸杆拉伸型坯并通入压缩空气吹胀型坯使之贴紧模具型腔，把模腔的形状与尺寸赋予制品，然后冷却最后脱模。

It begins with a linear KSB 8L stretch blow molding machine composed of the preform feed system with its chute, a conveyor and a feed ramp, plus the actual blow-molding machine with its integrated oven, preform spacing, blow-molding stations and built-on control cabinet. The eight-cavity blow molder operates in a two-stage-process, with an integrated oven and a built-in control cabinet. It excels in terms of space-saving construction.

生产线从一台直线形 KSB 8L 拉伸吹塑机开始，它包括带斜槽的预成型坯进给系统，一个输送机和进给坡道，加上具有一体化烤炉、预成型坯间隔、吹塑站和内置式控制柜。8 个型腔吹塑机以两步法工艺操作，具有一体化的烤炉和内置式控制柜，并在空间利用方面胜过其它的吹塑机。

At the same time,three dynamic models of cylinder powder green-preform are set up ,which are :die and corefixed on the die shoe , core moving with green-preform, core and die moving downwardin relation to green-preform. The theoretical equations of the green-preform densities andpressing stresses of the three pressing conditions are also derived.

同时建立了凹模与型芯固定在下模座、型芯随压坯一起运动和型芯与凹模相对于压坯向下运动等三种圆环形粉末压坯压制的力学模型，导出了这三种压制条件下的压坯密度与压制压力的理论公式；其结果能够指导粉末冶金模具设计，为发挥模具材料的潜力提供依据。

Basing on this mode and his two invention patents, chooseing ANSYS as platform and linking the important project of JiLin province Science and technology ministry 'cylindrical and cone spurgears rolling preform and extrusion precise forming equipment research and manufacture for automobile'(NO.20030311), the author made the finite element numerical simulation about elasto-plastic large deformation heat-force couping of rolling preform and stamping-extrusion and bulge-extrusion combining precise forming for spur gear', investigated qualitativiely and quantitatively on the gears formability for the environmental and the blank parameters , summarized some useful conclusions.

本论文是我的导师宋玉泉教授关于&塑性精密成形&研究方向的一个组成部分，按照他所提倡的&科、教、产一体化&培养模式，并以他的两项发明专利为依托，立足于以ANSYS软件为模拟平台，密切结合吉林省科技厅重点项目&汽车用圆柱圆锥直齿轮滚轧和挤压精成形设备研制&(批准号：20030311)和吉林大学超塑性和塑性研究所&直齿轮中试生产线建设&，开展了对&圆柱直齿轮滚轧制坯－镦挤、胀挤复合精成形&的有限元弹塑性大变形热－力耦合数值模拟，对环境参数和轧件内部的参数对制件成形性的影响进行了定性和定量的研究，总结了一些有意义的结论。

Based on the Darcys law, the theoretical model of permeability measurement was established. And the influence of different testing methods and major process parameters such as fabric structure, fiber volume fraction, injection pressure, flow rate and resin viscosity on preform permeability were investigated in details. It was found that the permeability of fibrous reinforcement mainly lied on the preform architecture.

文中首先根据达西定律建立了渗透率测量的理论模型，深入研究了不同的测试方法及主要工艺参数(纤维织物织构、纤维体积含量、充模压力、流动速度、树脂粘度)对渗透特性的影响规律，发现多孔介质增强材料的渗透率主要取决于纤维织物的结构形式，预成型体孔隙分布及其体积分数、压实性对渗透率有较大的影响，提高充模压力和流动速度可以缩短充模时间，在一定程度上可以提高渗透率。

The results show that the best sintering process for SiC preform is 1100℃, 8 h in vacuum, by which the open porosity is 99.6% and the preform strength reaches 0.57MPa. The thermo-physical characteristics of 57% SiC/Al composites produced by this technique are as follows: the relative density is 98.7%; the thermal expansion coefficient is 7.5×10^(-6)℃^(-1) which almost matches those of GaAs and BeO; the thermal conductivity is 1.65×10^5W/K, which corresponds to that of Cu(15%)/W and decuples that of Kovar alloy; the density is close to that of aluminum and less than that of one fifth of Cu/W.

结果表明：经1100℃真空烧结8h的SiC预成形坯开孔率可以达到99.6%，抗压强度为0.57MPa；所制备的57%SiC/Al复合材料相对密度为98.7%，热膨胀系数为7.5×10^(-6)℃^(-1)，与GaAs、BeO的接近，热导率为1.65×10^5W/K，与传统Cu(l5%)/W相当，是柯伐合金的10倍，在密度上接近Al，不到Cu/W的1/5。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。