The cutting performance of Al2O3 and Si3N4 ceramic cutting tools in the milling plywood

ABSTRACT

This research focuses on the cutting performance of Al₂O₃ and Si₃N₄ ceramic cutting tools in up-milling plywood, the results of which are as follows. First, whether the tool material is Al₂O₃ or Si₃N₄ ceramic, the cutting forces at low-speed cutting were less than those at high-speed cutting, and the machining quality at low-speed cutting was greater than that at high-speed cutting. Then, whether at low- or high-speed cutting, the cutting forces of Al₂O₃ cutting tools were higher than those of Si₃N₄ cutting tools, and the machining quality of plywood milled by Al₂O₃ ceramic cutting tools was poorer than that milled by Si₃N₄ ceramic cutting tools. Finally, Si₃N₄ ceramic cutting tools were more suitable to machine the wooden productions with much glue content than Al₂O₃ ceramic cutting tools for the better machined quality.     

木质饰面胶合板材色与视觉情感效应分析

木质饰面胶合板是人类合理利用木质装饰材料的一种非常有效的手段,其温暖的材色在感情上十分贴近人类,本文对市场常见的木质饰面胶合板作了色彩取样,从色彩学的角度总结出六种不同色度木质饰面胶合板的色彩情感效应,并结合实例探讨了其在室内设计中的视觉情感特征。为创造更舒适、健康的生活环境提供科学合理的选材用材方案。     

竹胶板拼装大模板施工技术

对竹胶板拼装大模扳的施工全过程进行了分析，并对其特点、使用范围、质量标准、安全措施及效益进行了阐述，最后通过具体工程实例证明了该拼装方法的实用性。     

Cracking of Short Lap Joints

In the lap joint shown in Figure 1, the sheets of elastic material AB and CD are originally plane and joined completely over their mating surfaces with a very thin adhesive of fracture energy R, When tensile forces F are applied to test the joint, cracks propagate from the points C and B to cause eventual separation of the elastic sheets.     

低甲醛排放脲醛树脂胶的制备及应用

尿素与甲醛的物质的量比1∶1,甲醛分2次加入,尿素分4次加入,增强剂为三聚氰胺,占尿素总量的4%。甲醛分2次加入的目的是使尿素与甲醛的反应动力学中生成的次甲基脲与二羟甲基脲处于最大值。用此工艺制备的UF树脂制成的人造板性能远高于国家标准及国际标准,板材的甲醛释放量达到F四星级标准。     

高层剪力墙结构住宅楼工程墙板和顶板整体施工技术

针对高层剪力墙结构住宅楼工程墙板和顶板施工,打破以往使用大模板的施工方法,根据实践经验,总结出利用多层木板作为剪力墙板和顶板模板,并对墙板和顶板进行整体化施工的施工工艺。     

我国竹胶合板模板行业的现状与展望

竹胶合板模板自研发以来,得到迅速发展,已形成了一个初具规模的产业.该产业现有3种半成品加工模式,2种胶合工艺,以及3种产品营销模式.但目前竹胶合板模板行业存在着利润空间缩小、企业管理水平低下、产品市场无序竞争、企业缺乏自主创新等弊端.基于此,提出了竹胶合板模板今后的发展方向:实现半成品加工的机械化、普及径向竹篾帘复合板生产技术、推广应用节能减排方法、推行浸渍纸贴面竹胶合板工艺等.     

清水混凝土技术在高层住宅楼中的应用

结合具体的工程实践，介绍了清水混凝土的定义及内控标准，对其具体的施工方法与技术质量控制要点进行阐述，指出该工艺的广泛应用，将会给企业带来明显的经济、社会效益。     

Foaming properties of soybean protein-based plywood adhesives

A study was conducted to evaluate the potential of soy protein-based plywood glues for foam extrusion. Foaming properties were the first criterion used to screen several soy protein sources. Foaming capacities and stabilities of glue mixes containing animal blood (control) or soy products (meals, flours, concentrates, and isolates) were compared and correlated with molecular weights and surface hydrophobicity indices (S _o) in an attempt to identify structure/function relationships. The blood-based glue mix produced more foam than any of the soy-based glues. Soy flours and concentrates generally produced greater foam volumes and more stable foams than soy meal and isolates. Differences in foaming properties could not be explained by solubility profiles or S _o. However, results of gel electrophoresis indicated that soy products with poor foaming properties had extensive structure modifications or contained considerably lesser amounts of protein available for foaming reactions. Glue mixes containing the soy flours ISU-CCUR, Honeysoy 90, Nutrisoy 7B, and defatted Soyafluff and the soy concentrates Arcon F, ISU-CCUR, and Procon 2000 demonstrated the desired mixing and foaming properties for foam extrusion.     

多层胶合板产品甲醛释放量的影响因素探讨

通过试验，分析讨论采用脲醛树脂生产多层胶合板产品过程中木材含水率、树种、表板厚度、平衡处理时间等生产工艺因素对甲醛释放量的影响。