双金属复合滑动轴承的结构与液态模锻成形工艺研究

发布时间：2018-03-31 14:50

  本文选题：双金属滑动轴承　切入点：液态模锻　出处：《北京交通大学》2011年硕士论文

【摘要】：滑动轴承是折弯机、剪板机的主要工作部件,由于长期在高速旋转和高应力磨损状态下,滑动轴承磨损消耗十分迅速。滑动轴承传统的铸造方法在使用过程中暴露出了一系列的问题,如极易产生缩松、缩孔缺陷,致密度低等。为了解决这些问题,本文提出了采用液态模锻双金属复合的工艺方式进行滑动轴承的生产,以提高滑动轴承的使用寿命和降低其生产成本。本文的研究以Q11-6.3×2000型滑动轴承为对象,从滑动轴承规格选择、结构设计、液态模锻工艺和模具设计等方面进行了系统的实验与理论研究。 根据轴套的结构特点进行了传热分析,并根据传热分析及假设,利用径向系统中的一维导热以及热阻分析方法建立了滑动轴承在服役条件下温升计算和衬层厚度设计的数学模型。。 在轴套直接液锻成形过程中,模具预热温度、金属液浇注方式及温度、开始加压时间都对轴套的成形质量有一定影响,通过协调以上各参数,可以避免轴套中出现冷隔、气孔、褶皱等缺陷。此外,试验中涂料的干燥程度对轴套中气孔的数量和分布有重要影响。 文章进行了月产200t批量生产轴套直接液锻成形工艺设计、设备选型及模具设计。该工艺中成形压力为340t、金属液浇注温度为1200℃、保压时间为5s、模具预热温度180-200℃加压和充型速度50mm/s、钢套预热温度600℃等。熔炼炉的最高温度应低于1300℃,最大熔炼质量为159Kg。并使用弯销脱模机构对模具结构进行了简化。
[Abstract]:Sliding bearing is the main working part of bending machine and shearing machine, because of long time under the condition of high speed rotation and high stress wear, In order to solve these problems, the traditional casting method of sliding bearing has exposed a series of problems, such as easy to produce shrinkage, shrinkage hole defect, low density and so on. In this paper, the production of sliding bearing by liquid die forging bimetallic composite technology is put forward in order to increase the service life of sliding bearing and reduce its production cost. The research of this paper takes Q11-6.3 脳 2000 type sliding bearing as an object. Systematic experimental and theoretical studies are carried out on the aspects of sliding bearing specification selection, structure design, liquid die forging process and die design. The heat transfer analysis is carried out according to the structural characteristics of the shaft sleeve, and according to the heat transfer analysis and hypothesis, The mathematical model of temperature rise calculation and liner thickness design of sliding bearing under service condition is established by using one-dimensional heat conduction and thermal resistance analysis method in radial system. In the process of direct liquid forging of the shaft sleeve, the preheating temperature of die, the pouring mode and temperature of molten metal, and the time of starting pressure all have certain influence on the forming quality of the shaft sleeve. Through the coordination of the above parameters, the cold insulation can be avoided in the shaft sleeve. In addition, the drying degree of paint has an important effect on the number and distribution of pores in the shaft sleeve. In this paper, the direct liquid forging process design, equipment selection and die design of the 200 t batch production shaft sleeve are carried out. The forming pressure is 340 t, the pouring temperature of molten metal is 1200 鈩，

本文编号：1691199