德式钳工锤冲孔整形模设计

介绍了一种德式钳工锤冲孔整形模具 ,利用该模具可有效避免德式钳工锤热锻工艺中冲孔时的变形 ,提高了产品质量。并阐述了模具的整体结构及工作过程 ,指出了模具设计要点。     

高密府绸的生产实践

本文对高密府绸的浆料配方进行了分析比较，提出了突出府绸布面风格特征、提高生产效率和入库一等品率的工艺和生产管理措施。     

Thermoplastic Sizing of Carbon Fibres in High Temperature Polyimide Composites

Thermoplastic sizing of various carbon fibres has been evaluated as a means of controlling the microcracking resistance, transflexural strength (TFS), and thermo-oxidative stability (TOS) of PMR-15 matrix composites. Four different fibre/thermoplastic size combinations were selected for this study, based on their higher TOS than appropriate controls. Data are presented for the transverse microcrack (TVM) density/inch, and the subsequent delamination of [0,90]_4s laminates induced by thermal cycling (-196 to 350°C for 20 cycles). Results for composite TFS, conditioned TFS (after heating in air at 350°C), and TOS (350°C and 316°C) are also reported. One fibre/thermoplastic size combination gave both good microcracking resistance, and significantly improved TOS, in composite when compared with current commercially-available material.     

定尺机技术改造的可行性分析

上海某钢铁厂中板分厂的精整工段,在长期生产中,定尺机由于定尺精度不准,从而影响了成品率,本文对此作了分析并提出了改进措施和方法。     

新型造纸沉淀剂PAC与DSR施胶体系

可在常温常压下生产盐基度０～７５％的ＰＡＣ，用ＰＡＣ与ＤＳＲ配合在近中性条件下取得一定的施胶度，能加填部分ＣａＣＯ３。与明矾－松香施胶体系相比，ＰＡＣ－ＤＳＲ施胶的纸页在施胶效果、强度、留着率等方面都有优势，盐基度对施胶效果有明显的影响。     

浆纱机卷绕张力控制系统的改造

通过对纱线卷绕过程中张力变化的分析与研究，建立了张力控制模型，提出利用交流伺服系统控制张力的方案，对系统的软硬件进行了设计。该系统具有结构简单、精度高的优点。     

Effect of residual stress on ACFM crack measurements in drill collar threaded connections

The drill collar threaded connection of the type used in hydrocarbon exploration is a critical component of the drillstring that is highly susceptible to fatigue damage. In an attempt to reduce costly downhole failures the connections are cold rolled to introduce compressive residual stress, and when in service the connections are routinely inspected. The Alternating Current Field Measurement (ACFM) technique is an increasingly popular method of thread inspection, however, results have indicated that the ACFM defect sizing capability may be compromised when it is used to inspect recently cold rolled connections. If a connection is cold rolled without first being defect free, subsequent inspections may under estimate crack depth with the standard interpretation. Inspection before rolling is therefore necessary.     

上浆剂对CF/EP界面粘结的影响

本文通过单纤维碎裂法，分别对未上浆及不同上浆剂处理的碳纤维与基体的界面粘结性进行表征。结果表明，不同上浆剂对界面粘结的影响不同。含活性基团较多的上浆剂可改善界面粘结，而含活性基团较少的上浆剂反而会使其减弱。     

A Unified Approach to the Sizing and Control of Energy Storage Systems

Grid operation and planning challenges arising out of large-scale integration of renewable power can to a large extent be solved by the use of energy storage systems (ESSs). The type and size of storage to be used may be decided by the amount of fluctuating power the storage charges or discharges to attain its objective. Storage systems can be used as single devices or as hybrid systems where two or more devices complement the working of each other. The objective of this paper is to find an accurate power and energy sizing methodology for storage devices working in a single or hybrid arrangement such that the power fed to the grid from a wind turbine generator is regulated to a constant value. A strategy for sizing of a hybrid ESS is proposed by choosing the long-term storage to be a battery energy system and the short-term device to be a flywheel and using frequency analysis techniques. In the case of flywheel energy storage system, the inertia and the gain of an integral controller applied to an induction-machine-based flywheel are obtained. The simulations are done in MATLAB.