Defect analysis and optimization of steel castings for shell casting
The crack and sand inclusion of motor shell steel castings are the inertia quality problems in casting production, and they […]
The crack and sand inclusion of motor shell steel castings are the inertia quality problems in casting production, and they […]
The formation reason and process of tensile crack casting defect are different from that of shrinkage crack casting defect. 1)
From January to March 2020, ZHY Casting used the above process to produce 200 motor housings in small quantities. Basically,
The hot crack casting defects are analyzed from the macro and micro morphology. The hot crack can be divided into
In 2014, ZHY Casting introduced a small lost foam casting production line, mainly for the development of castings for waste
In the field inspection, we should focus on the parts prone to casting defects. According to my experience in the
Fig. 1 and 2 fracture of anchor claw in drop test, which is visually characterized by brittle fracture. The main
In view of the serious casting defects in the small batch production process of ZHY Casting motor shell steel castings,
The two kinds of MNS inclusion defects observed are formed on the surface of oxidized inclusions. According to the literature
Fig. 1 slag inclusion defect on the upper surface of medium and large steel castings after processing, which is visually
Slag inclusion casting defect refers to the casting defect formed by dry sand, coating and other inclusions as molten iron
Different from forged steel parts, steel castings for hull structure have low carbon content and good welding performance. Defective parts
Fig. 1 the visual characteristics of air hole defects on the upper surface of steel casting hub are round, the
1. Improvement measures 1.1 Inspection and control of molding sand performance While maintaining the original test items and requirements of
Bolster and side frame are important running parts on the bogie of rail freight car. They bear the gravity of
The lost foam casting method is flexible and convenient in modeling and pouring, especially for products with complex structure. lost
According to the thinking method of formulating the inspection standard of JCSS hull steel castings in Japan, medium and large
According to the causes, the pores produced by lost foam casting steel castings are divided into the following four categories.
During the pouring process, due to the excessive amount of gas released by the thermal decomposition of the gas mold
Main reasons: when the sand box is under vacuum, the external air is sucked into the mold due to the
Carburizing is one of the common casting defects in the lost foam casting process of steel castings. The carburizing casting
1. internal stress is generated during lining plate casting, resulting in cracks in lining plate; 2. the fracture of the
The specific optimization measures are as follows: set annular external cold iron in sand core 2. The purpose of this
1. Manifestations of cold crack defects Under the joint action of welding stress and other embrittlement factors, the bonding force
Considering the easy realization degree and economic factors of each measure, and using measures 2, 3 and 6, the numerical
Firstly, we take the shrinkage porosity defect in steel castings as an example to explore how the traditional foundry solves
1. Manifestations of undercut defects Undercut is the result of electric arc scouring or melting the base metal near the
1. Fatigue load loading In order to effectively test the influence of multiple casting defects on the fatigue performance of
Through the finite element calculation of fatigue strength and safety factor, the changes of fatigue performance caused by different casting
With the continuous improvement of China’s economic strength and construction level, various steel structure buildings with beautiful appearance, high reliability