预成型

Punching technology for the sleeve of a new type expansion bolt;2. Ultimate strength of sleeve reinforced T-joints under out-plane bending;3. Various defects may occur in the production of plastic sleeve of railway switch tie with non-alkali glass fiber reinforced polyamide 66(GFRPA66), and reasons caused these defects are analyzed.

采用玻璃纤维增强尼龙66(GFRPA66)为原材料生产铁路岔枕套管时经常出现各种制品缺陷，分析了这些缺陷产生的原因，提出了通过调整成型工艺条件(注射温度、注塑压力、注射时间等)、改进模具结构及对原料进行预干燥处理等解决措施。

In this paper, the flax yarn will be used as the continuous reinforcement and the Polypropylene multifilament will be used as thermoplastic resin matrix. The two things will be made into a pp/flax covered yarn, which are ready to be woven into a plain fabric. The flax/pp composite board is accomplished by hot-pressing molding. Some other composite boards are also made, whose flax yarn haven been pretreated.

本课题将以亚麻纱线作为连续状增强体，聚丙烯复丝作为基体；采用包覆纱的浸渍工艺，制作了pp/亚麻包覆纱后浸料；再将包覆纱制成机织平纹布作为预成型件；通过热压成型工艺制作成复合材料板材；同时还制作了对亚麻纱线进行碱处理和偶联剂处理的复合材料板材。

Objective To establish a method to prefabricate tissue engineering bone scaffold with rapid prototyping manufacturing for repairing.

目的：采用快速成型技术对组织工程支架材料进行预塑形，探讨其在治疗颅颌面骨缺损中的应用前景。

And the production comprises that dissolving polyarylamide into organic solvent; mixing and adding alumina particles, disperser, holing agent to be vibrated via ultrasonic wave; putting into drying box to be aged and defoamed; irrigating into film; vaporizing it in drying box; putting into solidify liquid to be emerged; washing with distilled water, processing aminic acid solution, compressing and shaping.

分散剂0.6～8wt。％、成孔剂2～8wt。％组成，制备方法为：将芳香聚酰胺溶于有机溶剂中，在搅拌中加入氧化铝颗粒、分散剂、成孔剂超生震荡；放入干燥箱中熟化、脱泡；浇铸成膜；浇铸后的膜在干燥箱中蒸发，然后放入凝固液中浸泡，接着用蒸馏水漂洗干净后用甲酸溶液处理；最后预压成型。

The big size anvil used wax as plasticizer at dewaxing. The main dewax stage from 270℃ to 400℃. Have gas release summit between 400℃ and 750℃. Setting up rational process date at dewax stage can prevent cemented carbide crack. But the crack will appear and impair the quality of products when the microcrack flaw inner compact.

石蜡工艺大制品顶锤在脱蜡阶段，270℃-400℃为成型剂石蜡的主要脱除阶段，400℃-750℃时有气体释放高峰状态，在脱蜡预烧阶段设置合理工艺参数可以防止合金裂纹，但压坯本身若存在微裂纹缺陷，必然会显露出来影响产品质量。

In addition, the influence of the pressure applying moment and precure conditions on the quality of S2 glass fiber/cyanate resin composite laminates was analyzed for hot press process.

在此基础上，针对S2玻璃纤维/氰酸酯复合材料层板，采用热压机工艺考察了加压时机和预固化对层板成型质量的影响。

It is shown that the cyanate resin has low cure reactivity and high flowability, so the resin flow can not be controlled easily. The precure process makes the resin cure to a certain extent, decreases resin flowability, improves resin processability significantly, and enhances the composite laminates quality.

研究结果表明，该氰酸酯树脂反应活性低且流动性高，热压工艺中树脂流动不易控制；预固化可使氰酸酯树脂发生一定程度的自聚反应，从而降低其流动性，可明显改善氰酸酯树脂的工艺性，提高了层板的成型质量。

Ancillary tooling was used to premold the kitted layups into net-shape preforms, which then were placed in the RTM tool and held in precise position by the various steel tool details.

辅助性模具则用来将成套的接头与终型预成型件结合在一起，然后将其放在树脂传递模塑成型的模具上，并通过各种金属模具零部件固定在准确的位置上。

The basic range of FUCHEM VER are unpromoted and required the addition of both accelerators and promoters just like general UPR. The selection criteria of the curing system and amounts depend on the desired gel time, the temperature of both the resin and workshop, the laminate thickness, humidity, impurities and the posting-curing possibilities.

FUCHEM系列乙烯基酯树脂一般为非预促进树脂，固化系统与通用不饱和树脂类似，在室温或90℃以下固化时，应该加入固化剂和促进剂，但因根据成型工艺、作业温度、制品厚度、湿度大小等调整相应的加入量，同时根据不同的情况选用不同类型的固化系统。

It is listed in a sub project of Chinese National "863 Project""Agriculture Waste FB Gasifying Pretreatment Technology" and the project of the Natural Science Foundation of Henan Province project "Study of Agriculture Waste Cold Molding Mechanism".

本文研究工作属于国家&863&计划项目之子课题&农业废弃物流化床气化过程预处理技术研究&和河南省自然科学基金项目&农业废弃物颗粒燃料冷成型机理研究&的部分内容。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐