共查询到20条相似文献,搜索用时 46 毫秒
1.
橡胶波纹管常用作防尘护罩,一般采用吹制法或模压法制造。吹制法是将管状毛坯两端密封,在有外形的凹模型腔中加热,用压缩空气吹制。吹制法生产无需取型芯,但需两道工序、两套模具(制管状毛坯模具和吹制成型模具),不仅成本高,而且有些工艺参数难以控制(如硫化时间)。由于边加热边吹制,工艺条件较差;成型的波纹管断面变化不能太大(如圆角和节距不能太小),波纹数量受到限制,因此整体的伸缩量受到限制,外观质量也较差。 相似文献
2.
面向未来移动设备的轻量化塑料部件轻量化工艺链的每一环节都得益于使用了碳纤维增强部件(CFP),该部件是通过HP—RTM(高压树脂传递模塑)工艺生产的。这种部件的生产,从纤维的准备和纤维预成型开始。首先,将这些纤维整合进经克劳斯玛菲特殊设计和制造的模具中,该模具装载在克劳斯玛菲的新型MX600模架中。 相似文献
3.
4.
5.
6.
(1)认识汽车复合材料
(2)复合材料在汽车轻量化中有所作为的关键
(3)复合材料工业制造技术
(4)展望:机遇与挑战 相似文献
7.
综述了计算机辅助设计(CAD)/计算机辅助工程(CAE)技术在普通塑料制品制造、汽车轻量化以及航天航空等领域的应用。首先建立产品三维模型并进行塑件分析,初步设计出模具的结构,通过优化得到概念化的模具结构;然后进行注塑模具的详细设计,包括型芯型腔的设计、成型零部件的设计,以及对浇注系统、冷却系统、侧向抽芯、顶出机构的设计,通过充填分析、流动分析、冷却分析、翘曲分析使模具设计趋于完善。使用CAD/CAE仿真技术可以保证塑件模具结构设计的可靠性和高效性,降低了生产成本,提高了产品设计质量。 相似文献
8.
简述了波纹管换热器的结构特点;分析了波纹管换热器制造和使用过程中存在的问题;提出了相关技改措施。 相似文献
9.
2008年3月20日上午,“第三届东莞(长安)国际模具及制造技术展览会暨国际工量具采购会新闻发布会”在东莞市长安镇聚和国际机械模具五金城二楼模具技术国家重点实验室东莞实验中心隆重举行。组委会宣布:“2008第三届东莞(长安)国际模具及制造技术展览会暨国际工量具采购会”(英文缩写为CMHTF)将于2008年5月28—31日在东莞长安聚和国际机械模具五金城隆重举行。 相似文献
10.
11.
乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
12.
13.
我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉 相似文献
14.
15.
16.
17.
The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献
18.
Conclusions It is significant that the purification on a single passage of viscose through porous ceramic corresponds to the result of a two-stage filtration of it in industrial filter-presses with standard fillings.Kiev Combine. Kiev Technological Institute of Light Industry. Translated from Khimicheskie Volokna, No. 3, pp. 20–22, May–June, 1969. 相似文献
19.
20.
A refined nonlinear value of the main parameter of a material, i.e., the elongation modulus versus the instant temperature value, was suggested for introduction into the computational algorithm of tempering stresses. 相似文献