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挤压

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On the basis of the analysis of cold extrusion process for the duralumin drive wheel,the scheme,the drawing and the blank dimension of cold extrusion were worked out.

对硬铝主动轮的冷挤压工艺进行分析,确定了冷挤压零件图和冷挤压方案及毛坯尺寸,对零件冷挤压的变形程度进行了校核,计算了挤压吨位,拟定了挤压前的毛坯处理规范,并对模具结构进行了介绍。

The strength of SiCp/Al composites hot-pressed above and extruded below, or hot-pressed below and extruded above the solidus temperature of the matrix is higher than that of composites hot-pressed and extruded above or below the abovementioned temperature, and the strength of SiCp/Al composites hot-pressed above and extruded below the solidus temperature of the matrix is the highest.

以基体合金的固相线温度为基准,高温热压、低温挤压或者低温热压、高温挤压的复合材料的强度优于高温热压挤压或者低温热压挤压的复合材料,并且高温热压、低温挤压的复合材料的力学性能最优。

In order to further understand the organization and performance of the product extruded from beryllium bronze,the nonuniformity of ingot casting organization extruded from beryllium bronze,the quenching macrocrystalline ring organization and layer structure of extrusion bars,the nonuniformity in mechanics,and extrusion effects were analyzed.

为了进一步了解铍青铜正向挤压制品的组织和性能,分析了铍青铜挤压铸锭组织的不均匀性、挤压棒材淬火后的粗晶环组织、以及挤压棒材的层状组织;同时对挤压棒材力学性能的不均匀性和挤压效应进行了分析。

It was shown by experimental results that ther e a re four factors playing chief roles on processing of fin such as geometr ic parameters of cutting tool, depth of extrusion, feed and speed of choppin g-ex trusion. For a certain cutting tool, a limit feed was brought up with a defini te extrusion depth under given chopping-extrusion speed.

实验结果表明,影响翅片形成的主要因素有刀具几何参数、挤压深度、进给量和劈切挤压速度;对某一刀具,在选定挤压速度时,一定的挤压深度对应一个极限进给量,一定的进给量对应一个极限挤压深度。

At the corner near the punch the severe deformation is observed where equivalent strain and temperature are higher than other areas. Simulation results also show that the container should be heated to avoid the underfilling defect. The conclusions of simulation agree with the experiment results well.

数值模拟结果再现了反挤压试验中的未充满现象,发现影响未充满现象的主要因素是挤压筒的温度,结果表明,在进行挤压试验时应将挤压筒的温度加热到等于试样或低于试样50℃的温度左右,这样可以避免在挤压时出现未充满的缺陷。

First, the angular velocity function and maneuver load for certain maneuver flight (including hover, dive-hike and these two combined) are set up. The simulation results of the vibration of double-disk rotor system with cantilever supported on rigid bearings show that rotor would be apparently deformed under maneuver load. Second, the performance of oil force of SFD in maneuver flight is analyzed. The results show that in maneuver flight, the SFD with centering spring will become eccentric and its oil force will be time-related and offset-related.

首先,建立了水平盘旋、俯冲拉起及盘旋+俯冲拉起复合机动三种机动飞行条件下的机动角速度函数,并确定了对应机动飞行条件下的机动附加载荷(附加离心力和附加陀螺力矩),分析了带刚支的双盘悬臂转子系统在机动飞行条件下的振动特性,发现发动机转子在机动飞行时会发生明显变形;随后,分析了非定心挤压油膜阻尼器的油膜力特性,机动飞行时,油膜轴颈在机动附加载荷的作用下偏离外环中心,使得带定心弹支的挤压油膜阻尼器也变成了非定心挤压油膜阻尼器,其非定心挤压油膜力是瞬态时变的,并且与SFD油膜轴颈偏移量和进动形态有关;然后,在经典的Jeffcott转子系统中引入带定心弹支的挤压油膜阻尼器,分析了机动飞行时非线性转子系统的振动特性,发现挤压油膜阻尼器油膜力的非协调特性也反映到转子系统的振动响应中;之后,对机动飞行条件下带挤压油膜阻尼器的双盘悬臂转子系统的振动特性进行了分析,并重点分析、总结了俯冲拉起机动飞行时,系统结构参数和工作状态参数(转速比、机动飞行半径、机动角速度等)对该系统振动特性的影响。

First, the angular velocity function and maneuver load for certain maneuver flight (including hover, dive-hike and these two combined) are set up. The simulation results of the vibration of double-disk rotor system with cantilever supported on rigid bearings show that rotor would be apparently deformed under maneuver load. Second, the performance of oil force of SFD in maneuver flight is analyzed. The results show that in maneuver flight, the SFD with centering spring will become eccentric and its oil force will be time-related and offset-related. Then, SFDs are introduced into typical Jeffcott rotor system. The whole system will be statically displaced in maneuver flight and the nonsynchronous components of oil force appear in the response of rotor system.

首先,建立了水平盘旋、俯冲拉起及盘旋+俯冲拉起复合机动三种机动飞行条件下的机动角速度函数,并确定了对应机动飞行条件下的机动附加载荷(附加离心力和附加陀螺力矩),分析了带刚支的双盘悬臂转子系统在机动飞行条件下的振动特性,发现发动机转子在机动飞行时会发生明显变形;随后,分析了非定心挤压油膜阻尼器的油膜力特性,机动飞行时,油膜轴颈在机动附加载荷的作用下偏离外环中心,使得带定心弹支的挤压油膜阻尼器也变成了非定心挤压油膜阻尼器,其非定心挤压油膜力是瞬态时变的,并且与SFD油膜轴颈偏移量和进动形态有关;然后,在经典的Jeffcott转子系统中引入带定心弹支的挤压油膜阻尼器,分析了机动飞行时非线性转子系统的振动特性,发现挤压油膜阻尼器油膜力的非协调特性也反映到转子系统的振动响应中;之后,对机动飞行条件下带挤压油膜阻尼器的双盘悬臂转子系统的振动特性进行了分析,并重点分析、总结了俯冲拉起机动飞行时,系统结构参数和工作状态参数(转速比、机动飞行半径、机动角速度等)对该系统振动特性的影响。

This invention relates to an elevator wire rope end joint and its field koldflo and a device which applies a partial koldflo to connect the wire rope and a joint blank to one unit at site when mounting and maintaining elevators, every joint is extruded by 2-4 times with 10-20 mm width eath.

本发明涉及一种电梯钢丝绳绳端接头及其现场冷挤压成型方法和冷挤压装置,本发明采用局部冷挤压成型法在电梯安装和维护的现场把钢丝绳和接头毛坯连成一体,每个接头进行2~4道挤压,每道挤压宽度为10~20mm。

And objective parameters (texturized degree, color, hardness, springiness, chewing, water absorption, yield, etc.) were investigated in the high moisture soy protein extrusion process, and the statistical models of system and objective parameters were built, using the step-by-step regression analysis; A comprehensive evaluation of the products, and the process optimization of high moisture extrusion were obtained,using factor analysis; Secondly, residence time distribution and soy isoflavones losses kinetics were studied in the high moisture extrusion; Finally, chemical bonding process, the micro-structure and protein secondary structure changes were investigated in the texturization of soy protein, then the mechanism assumptions of texturization soy protein by moisture extrusion were proposed.

本文对大豆蛋白高水分挤压组织化技术和机理进行了研究,研究内容包括:首先采用系统分析法,研究了大豆蛋白高水分挤压过程中,挤压机操作参数(螺杆转速、物料水分、喂料速度和机筒温度)对系统参数(系统压力、扭矩、单位机械能等)、目标参数(组织化度、色泽、硬度、弹性、咀嚼性、吸水率、产量等)的影响规律,建立了各因变参数的统计模型;采用因子分析法对产品进行了综合评价,并对高水分挤压组织化工艺进行了优化;其次,研究了大豆蛋白高水分挤压中的停留时间分布以及大豆异黄酮的损失动力学;最后,研究了大豆蛋白组织化过程中化学键、微观结构和蛋白质二级结构的变化规律,提出了大豆蛋白高水分挤压组织化的机理假设。

Meanwhile, the application range of twin-screw extrusion in food industry should be extended and further developed, besides the current wide use of production of breakfast cereals food, snacks, paste, instant flour, modified starch, texturised protein and food fiber.

本文就挤压过程中原料相互作用对产品品质的影响,早餐谷物营养配方设计、双螺杆挤压操作参数对产品品质的影响、挤压早餐谷物食品品质指标之间相互联系等方面进行了深入研究,填补了一些空白,对于开发挤压早餐谷物食品,探索双螺杆挤压机加工谷物食品具有一定的理论和现实意义。

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