地坑铸件树脂砂处理工艺及树脂砂再生系统的改造

发布时间：2018-04-18 22:05

本文选题：树脂砂 + 砂处理系统　；参考：《湖南大学》2016年硕士论文

【摘要】：公司目前使用自硬树脂砂的砂处理系统,其再生砂的砂铁比高,燃烧分解率低,再生砂的工艺参数与实际生产需要不匹配,再生砂的灼减量与微粉含量超标,影响再生脱膜率以及与其成线性关系的树脂、固化剂的加入量,此外,再生砂的砂粒表面质量、圆整度、颗粒均匀性等处于不佳状态,从降低生产成本和提高公司产品的质量角度,上述均是公司急待解决的问题。本文从公司树脂砂的砂处理系统工艺及其设备的生产实际出发,对决定树脂砂质量的再生砂的灼减量和微粉含量等主要影响因素进行了实验研究和数据统计,在分析地坑铸件树脂砂处理工艺和实际操作注意事项的基础上,针对公司目前树脂砂系统存在的问题,通过理论计算、检测和可行性分析,提出了树脂砂再生系统的改造方案。树脂砂再生的主要目的是获得一个稳定的烧损值即灼减量。树脂再生砂的灼减量是衡量树脂砂性能优劣的重要指标,合理控制灼减量有助于控制树脂砂的发气量,以及减少粘结剂的加入量,从而有效降低铸件气孔类缺陷,从而获得良好的经济效益。通过地坑铸件树脂砂处理工艺和实际操作的分析研究,发现为达到工艺要求的再生砂抗拉强度,公司目前树脂、固化剂的加入量严重超标;公司现有的产品结构决定了砂铁比较大,树脂砂的整体燃烧分解率低,设备的实际脱膜率不足,这些因素均导致公司目前再生砂灼减量和微粉含量的超标。最后,根据目前地坑铸件树脂砂处理工艺的现状及存在的问题,并对整个树脂砂的砂处理流程进行参数优化和分析,发现减少树脂和固化剂的加入量,增加新砂的加入量,减小砂铁比等工艺参数,可优化当前再生砂的质量,但有效降低再生砂的灼减量比较困难;通过设备的改造,在当前树脂砂一级再生的基础上,增加二级再生设备,提高旧砂的脱膜率,可将再生砂的灼减量降低到目标值的范围内,这对解决树脂砂、固化剂加入量的超标问题,以及提高树脂砂的质量均有较大帮助。
[Abstract]:At present, the company uses the sand treatment system of self-hardened resin sand, its reclaimed sand has high ratio of sand to iron, low rate of burning and decomposing, the technological parameters of recycled sand do not match with the actual production needs, and the content of reclaimed sand burning less and fine powder exceeds the standard.In addition, the surface quality, roundness and uniformity of the recycled sand are in poor condition, such as the resin and the amount of the curing agent, which have a linear relationship with the regenerated sand, and the surface quality, roundness and uniformity of the reclaimed sand are not good.In order to reduce production costs and improve the quality of the company's products, these are urgent problems to be solved.Based on the process of resin sand treatment system and the production practice of its equipment, this paper has carried out experimental research and data statistics on the main influencing factors, such as burning reduction and fine powder content of recycled sand, which determine the quality of resin sand.Based on the analysis of resin sand treatment technology and practical operation points for attention in ground pit castings, and in view of the problems existing in resin sand system at present, through theoretical calculation, detection and feasibility analysis, the modification scheme of resin sand regeneration system is put forward.The main purpose of resin sand regeneration is to obtain a stable burning loss value.The burning reduction of resin regenerated sand is an important index to evaluate the properties of resin sand. Reasonable control of burning reduction can help to control the gas production of resin sand and reduce the addition of binder, thus effectively reducing the porosity defects of castings.Thus, good economic benefits are obtained.Through the analysis and study of resin sand treatment technology and practical operation of ground pit castings, it is found that in order to achieve the tensile strength of recycled sand, the amount of resin and curing agent added in the company is seriously exceeded the standard at present.The existing product structure of the company determines that the sand iron is relatively large, the overall combustion decomposition rate of the resin sand is low, and the actual demembrane rate of the equipment is insufficient. These factors all lead to the excess of the reclaimed sand burning reduction and the content of fine powder in the company at present.Finally, according to the present situation and existing problems of resin sand treatment technology of ground pit castings, and the parameter optimization and analysis of the sand treatment process of the whole resin sand, it is found that the amount of resin and curing agent is reduced, and the addition of new sand is increased.The quality of reclaimed sand can be optimized by reducing the ratio of sand to iron, but it is difficult to reduce the burning reduction of recycled sand effectively.Increasing the demembrane rate of the old sand can reduce the burning reduction of the recycled sand to the target value, which is helpful to solve the problem of overstandard addition of resin sand and curing agent, as well as to improve the quality of resin sand.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TG221

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