汽轮机叶片毛坯数控径向锻造关键技术研究
发布时间：2018-11-05 19:02
【摘要】：随着制造技术自动化的发展趋势,汽轮机叶片毛坯的成形质量直接影响汽轮机叶片质量以及能量转换效率。国内的叶片毛坯成形技术主要依靠人工自由锻造及挤压镦头成形,成形质量具有较大的随机性,生产加工效率无法满足现在的企业需求,同时叶片毛坯的设计过程需耗费大量的人力与时间,增加了叶片生产周期及企业制造成本,所以亟需更加先进的设计技术和制造成形工艺运用到叶片毛坯的生产过程中。为此,本文着力于探究先进的叶片毛坯径向锻造成形工艺,开发出适用于叶片毛坯径锻成形的辅助工艺系统,提高叶片毛坯的成形质量以及生产效率,实现叶片毛坯从设计到锻造成形过程的规范化、自动化及系统化,基于此本文主要进行的研究工作如下:(1)以叶片常用材料0Cr17Ni4Cu4Nb不锈钢为研究对象,对其在900~1200℃,应变速率在0.001s-1~10s-1范围内的热变形流变行为进行研究分析,基于Prasad塑性失稳判据以及动态材料模型(DMM),绘制0Cr17Ni4Cu4Nb不锈钢的热变形能量耗散图和热加工图,揭示0Cr17Ni4Cu4Nb不锈钢在热变形条件下组织演变规律以及热变形机理,通过对热加工图的分析,获得失稳变形参数范围及最佳热变形参数范围,为0Cr17Ni4Cu4Nb不锈钢热加工工艺制定和优化提供理论依据。(2)基于热加工图分析得到的最佳热变形参数,借助Simufact.Forming锻造分析软件,建立汽轮机叶片毛坯四锤头径向锻造仿真模型,侧重分析了在工艺参数、锤头类型及结构参数不同情况下,叶片毛坯锻后的锻透性、尺寸精度、内部晶粒尺寸分布以及外观缺陷情况,借助数学评价手段处理仿真数据,通过比较分析不同锻造条件下的仿真结果,得到不同锻造工况下最佳的锻造工艺参数、锤头类型以及结构参数,给设计人员在锤头结构参数设计及选型和工艺参数确定方面提供参考。(3)通过对叶片毛坯设计技术的归纳总结,结合实际经验,构建了叶片毛坯自动化设计体系框架,将由叶片成品锻件到叶片毛坯设计及原始坯料确定的逆向设计过程以数学模型创建联系。同时,对径锻锤头进行分类,依据径锻锤头的设计准则及结构特点,将其设计过程做参数化处理。此外,根据径向锻机锻造过程的运动特性,以典型圆柱台阶式毛坯为例,对其径锻工艺成形过程进行了探究分析。(4)以叶片毛坯和径锻锤头设计及径锻成形工艺控制数学模型为基础,结合C#与UG/NXOpen二次开发技术,开发出基于参数驱动的叶片毛坯径向锻造工艺辅助系统,实现叶片毛坯及径锻锤头设计过程的参数化自动化,缩短叶片毛坯设计周期,提高毛坯的生产效率。同时,根据毛坯锻造工步图生成的工艺控制参数表,给径锻上位机控制软件编程提供方便。
[Abstract]:With the development of manufacturing automation, the forming quality of turbine blade blank has a direct impact on turbine blade quality and energy conversion efficiency. Domestic blank forming technology mainly depends on artificial free forging and extrusion upsetting. The forming quality is random, and the production efficiency can not meet the needs of enterprises. At the same time, the design process of blade blank needs a lot of manpower and time, which increases the production cycle of blade and manufacturing cost of enterprises, so it is urgent to apply more advanced design technology and manufacturing forming technology to the production process of blade blank. Therefore, this paper focuses on exploring the advanced radial forging forming technology of blade blank, developing an auxiliary process system suitable for blade blank radial forging forming, and improving the forming quality and production efficiency of blade blank. In order to realize the standardization, automation and systematization of blade blank from design to forging forming process, the main research work based on this paper is as follows: (1) taking 0Cr17Ni4Cu4Nb stainless steel, a common material of blade, as the research object, it is studied at 900 鈩，
本文编号：2313069
[Abstract]:With the development of manufacturing automation, the forming quality of turbine blade blank has a direct impact on turbine blade quality and energy conversion efficiency. Domestic blank forming technology mainly depends on artificial free forging and extrusion upsetting. The forming quality is random, and the production efficiency can not meet the needs of enterprises. At the same time, the design process of blade blank needs a lot of manpower and time, which increases the production cycle of blade and manufacturing cost of enterprises, so it is urgent to apply more advanced design technology and manufacturing forming technology to the production process of blade blank. Therefore, this paper focuses on exploring the advanced radial forging forming technology of blade blank, developing an auxiliary process system suitable for blade blank radial forging forming, and improving the forming quality and production efficiency of blade blank. In order to realize the standardization, automation and systematization of blade blank from design to forging forming process, the main research work based on this paper is as follows: (1) taking 0Cr17Ni4Cu4Nb stainless steel, a common material of blade, as the research object, it is studied at 900 鈩，
本文编号：2313069
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