共查询到20条相似文献,搜索用时 171 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
9.
CDG辊压机挤压辊的制造与硬面堆焊 总被引:3,自引:2,他引:1
磨损问题是CDG系列辊压机设计与制造中重点关注的问题.根据辊面磨损失效机理,CDG辊压机辊子母体采用优质合金钢整体锻造,辊面耐磨层科学地采用郑州机械研究所研制的ZD系列堆焊材料及堆焊工艺,将防撕裂层,过渡层、耐磨层的材料、硬度组合搭配.辊面为一字形耐磨花纹,能使物料拉入角更加均衡、稳定,同时能有效消除辊子的轴向作用力,使设备工作更加稳定,辊面补焊工作也更加简单.实践证明,辊面使用寿命可达6000~8000h. 相似文献
10.
锁紧环式换热器在高温、高压、临氢和硫化氢环境条件下工作,需在其内部堆焊不锈钢耐蚀层。但不锈钢耐蚀层的堆焊是制造中的技术难点,堆焊材料选择不当或堆焊工艺不合理会产生堆焊层剥离问题,所以解决堆焊层的抗剥离问题就成为锁紧环制造中的技术关键。通过对不锈钢耐蚀层产生剥离问题的影响因素进行焊接性分析和工艺研究,确定了最佳工艺匹配,成功地完成了耐蚀层堆焊。 相似文献
11.
由于外加磁场的堆焊技术在焊接领域得到了广泛应用,本课题是此项技术在化工领域的应用,我们采用堆焊是等离子弧堆焊技术,用铁基合金粉末Fe5外加直流横向磁场,并同时通过钢材样本验证了结果,分析了不同磁场参数与材料耐磨性之间的关系,简单介绍了在外加磁场时堆焊层中硬质相的形态分布的影响因素,得到了很好的结果。 相似文献
12.
Restraint of shrinkage deformations is the main factor influencing the serviceability and durability of bonded concrete overlays. Failure mechanisms associated with differential shrinkage stresses are cracking and debonding. Tensile overlay relaxation may release a considerable amount of the imposed stresses and is therefore of major importance for the performance of the overlay. Composite specimens were used for the identification of fundamental characteristics of strain development of bonded concrete overlays, with regard to different interface textures and overlay materials. The development of overlay strains and material parameters in relation to the observed mechanisms of overlay failure allowed an estimation of the magnitude of tensile relaxation. A simplified approach to tensile stress relaxation in bonded overlays is introduced. 相似文献
13.
通过对受集中载荷的卧式容器进行受力分析,结合材料力学及有关规范,分析该情况下的卧式容器的受力情况,从而推导出其计算过程和方法.并通过实例对外加集中载荷的影响进行了分析. 相似文献
14.
本文从钢材采购质量控制的角度,列举并分析了冶炼、成形、热处理、钢厂检验、进厂复验等环节影响钢材质量和性能的事例和原因,提出了压力容器制造厂钢材采购质量控制的措施。 相似文献
15.
16.
17.
In recent years, with growing contradiction between energy supply and demand, the more and more high demand of the environmental protection is needed. The work represented an environment friendly method for recycling of waste rubber and pulp sediment that a new composite material was prepared using pulp sediment as the matrix, used rubber powder as the toughening agent, and sawdust as the reinforcement. The effects of used rubber powder content on the mechanical properties of the pulp sediment and sawdust/pulp sediment were studied by measuring Shore A hardness, tensile stress, and elongation-at-break. The morphology of used rubber powder/pulp sediment composites was analyzed by scanning electronic microscopy and transmission electron microscopy. The curing conditions were also discussed. The results showed when the used rubber powder/pulp sediment mass ratio was 8/100, the used rubber powder/pulp sediment sample showed smooth surface, high hardness, compact structure, uniform arrangement, and good compatibility. When the pulp sediment used as the matrix, sawdust as the reinforcement, and used rubber powder as the toughening agent, the proper recipe of the composites was 100?phr pulp sediment, 30?phr sawdust, and 10?phr used rubber powder. The mechanical properties of the used rubber powder/pulp sediment were greater than those of pure pulp sediment and used rubber powder/sawdust/pulp sediment. The best curing conditions for the used rubber powder/pulp sediment composites were at 150?°C under 5?MPa for 15?min. The study on used rubber powder modified pulp sediment, exploits a new way to recycle used rubber powder and pulp sediment, not only benefit environment purification, but also reduce cost of sheet materials, and develops a new way for the economy and environment protection. 相似文献
18.
压力容器标准和规范中分析设计方法的进展 总被引:3,自引:1,他引:2
作为一种压力容器分析设计方法,应力分类法在工程应用中存在设计结果与结构失效状态偏离,且对少数结构其设计结果偏不安全这样的问题.依据多年的研究工作,欧盟压力容器标准EN 13445与美国锅炉压力容器规范ASME Ⅷ-2分别给出了两个基于弹塑性分析的分析设计方法--直接法和弹一塑性方法.这两种方法都是考虑和利用材料的塑性变... 相似文献
19.
20.
以焦炭塔失效的敏感部位——筒体与裙座连接处附近区域为研究对象,采用大型有限元分析软件ANSYS,分析、比较了4种不同的连接形式(一般对焊型、搭接型、堆焊型和整体煅焊型)对机械应力强度的影响.结果表明,连接形式对最大机械应力的影响并不明显,从连接处的应力值来看,整体煅焊型和堆焊型结构明显比另外两种结构好,搭接型的应力值最... 相似文献