铸铁检测基础平板制作过程中的物理性能
时间：2016/1/26 8:51:45
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铸铁检测刮研平板（刮研平台）在使用时要先进行安装调试，常用调整垫铁调节水平，购买本厂铸铁刮研平板附赠相应规格调整垫铁，首先把检验平台的工作面清理干净，在确认没有问题的情况下使用，使用过程中，要注意避免工件和平板的工作面有过激的碰撞，防止损坏检验平板（检验平台）的工作面；工件的重量不能超过检验平台的额定载荷，否则会造成工作质量降低，损坏平板的结构，甚至会造成平板变形，使之无法使用。铸铁检测刮研平板的铸造应力、变形和开裂及其防止。
铸造应力的形成：铸铁件再凝固后冷却过程中，温度将继续下降而产生收缩，如收缩收到阻碍，便会在铸件中产生铸造应力。
铸造应力按其形成原因可分为热应力、相变应力和机械阻碍力3种。
热应力：由于铸铁件的各部分在冷却过程中的冷却速度不同，造成各部分的收缩量不同，单铸件各部分联为一个整体，彼此间互相制约而产生应力。铸铁检验刮研平板这种由于线收缩受热阻碍而产生的热应力一般成为铸件内的残留应力，其大小与铸件厚壁部分由塑性状态变为弹性状态时厚薄两部分的温度差成正比，即铸件的壁厚差愈大，残留热应力也愈大。凡能促使铸件同事凝固及冷却速度的因素，都能减小铸件中的残留热应力。
Physical Properties of Cast Iron Testing
Foundation Plate in Manufacturing Process
Cast iron scraping and grinding flat plate
(scraping and grinding platform) should be installed and debugged before use.
Regulating level of pad iron should be adjusted in common use. Buying our cast
iron scraping and grinding flat plate with corresponding specifications to
adjust pad iron. First of all, clean the working face of the inspection
platform, use it when there is no problem, and pay attention to avoiding during
use. No excessive collision between the workpiece and the working face of the
flat plate can prevent damage to the working face of the inspection flat plate
(inspection platform); the weight of the workpiece can not exceed the rated
load of the inspection platform, otherwise, the working quality will be
reduced, the structure of the flat plate will be damaged, and even the flat
plate will be deformed, making it unusable. Cast iron detects casting stress,
deformation and cracking of scraping and lapping plate and prevents them.
Foundry stress formation: During the
cooling process of cast iron after solidification, the temperature will
continue to decrease and shrinkage will occur. If the shrinkage is hindered,
the casting stress will occur in the casting.
Casting stress can be divided into thermal
stress, phase change stress and mechanical hindrance force according to its
causes.
Thermal stress: Because of the different
cooling speed of each part of the cast iron in the cooling process, the
shrinkage of each part is different. Each part of the single casting is united
as a whole, which restricts each other and produces stress. The thermal stress
of scraping and lapping slab in cast iron inspection is usually the residual
stress in the castings, which is proportional to the temperature difference
between the thick and thin parts when the thick wall part of the castings
changes from plastic state to elastic state. That is to say, the bigger the
wall thickness difference of the castings is, the bigger the residual thermal
stress is. The residual thermal stress in the castings can be reduced by all
factors that can promote the solidification and cooling rate of the castings
colleagues.
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