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阀门制造工艺的三大特点一
[作者:aowl] [日期:19-03-12] [浏览次数:] [来源:]

阀门制造工艺的三大特点一•●、阀门毛坯的制造工艺及检验工艺比较复杂 First, the manufacturing process and inspection process of valve blank are rather complicated. 阀门的铸件毛坯是结构叫复杂的薄壁壳体件。其铸件要求表面光洁•●、铸字清晰,特别是要有致密的缺陷。为了满足上述要求,铸造时应采取一系列工艺措施,如选用高耐火度的造型材料并控制型砂水份•●、造型时应分层打实以保证砂型硬度,采用合理的浇帽口系统及严格控制浇注速度和温度等。由于技术要求较高,阀门毛坯的铸造工艺远较一般铸件复杂。 The casting blank of valve is a complex thin-walled shell part. The casting requires smooth surface and clear casting, especially with dense defects. In order to meet the requirements mentioned above, a series of technological measures should be taken in casting, such as selecting high refractory molding materials and controlling the moisture of the molding sand. The molding should be layered to ensure the hardness of the sand mold. The proper casting mouth system and strict control of the pouring speed and temperature are adopted. Because of the high technical requirements, the casting process of valve blank is far more complicated than ordinary casting. 此外,阀门毛坯除检查尺寸,位置精度及外观外,有的还有作金相组织•●、力学性能•●、耐腐蚀性能及无损探伤等多种检验,故阀门的检验工艺也较复杂。 Besides, in addition to checking the size, position accuracy and appearance of the valve, there are many kinds of inspection such as metallographic organization, mechanical properties, corrosion resistance and nondestructive testing, so the inspection technology of the valve is also complicated. 二•●、机械加工难度大 Two. Mechanical processing is difficult 由于阀门材料的各类繁多,除各种铸铁•●、碳素钢外,其大部分高强•●、耐腐蚀和高硬材料的切削性能都很差,很难使零件达到规定的加工精度和表面粗糙度。而阀门密封面的几何型状精度和表面粗糙度的要求很高,因此更增加了阀门机械加工难度。 Because of various kinds of valve materials, the cutting performance of most high strength, corrosion resistant and hard materials is very poor except for various kinds of cast iron and carbon steel. It is difficult to make the parts reach the required machining precision and surface roughness. However, the requirement of geometric shape precision and surface roughness of valve sealing surface is very high, so the machining of valve is more difficult. 同时,阀门材料的切削性能差,又给阀门的加工方法•●、刀具材料•●、切削用量•●、工艺装备等方面带来了很多新的问题。 At the same time, the cutting performance of the valve material is poor, and it also brings a lot of new problems to the processing method, cutting tool material, cutting amount and technical equipment of the valve. 三•●、阀门零件在机床上安装比较困难 Three. It is difficult to install the valve parts on the machine tool 阀门主要零件的结构•●、形状比较复杂,有些零件属壁薄•●、细长件,刚性差。在机床上加工时,定位和装夹都比较困难,因此往往需要复杂的专用夹具。 The structure and shape of the main parts of valves are rather complicated. Some of them are thin, slender and rigid. When machine tools are processed, positioning and clamping are difficult, so complex special fixtures are often needed.

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