Sand casting process, advantages and disadvantages
Basic process of sand casting process a. Sand casting process includes manufacturing model and core, sand mixing, molding and core […]
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The prevention method of the non-uniform hardness of the cast iron
Features: after the surface of the casting is processed, there are micro concave and convex, and some parts have “shiny”
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How to prevent the defect of broken fast graphite in ductile iron casting
(1) The influence of chemical composition on carbon equivalent is the biggest. In heavy section ductile iron, carbon equivalent should
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Classification of sand casting process
Gravity casting Gravity casting refers to the process of injecting molten metal into the mold under the action of the
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Prevention method of casting deformation defects of cast iron
Features: long castings are prone to deformation, such as machine bed, cylinder block and cylinder head of diesel engine. Due
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How to dehydrate the casting coating
Paint dewatering refers to the “shrinkage dewatering” of paint slurry, also known as “desizing”, in which a layer of water
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Common casting methods are as follows
1.Sand casting: sand casting is a method of making sand mold with model and pouring in liquid metal after mixing
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Common defects and prevention of metal mold casting
(1) Casting pinhole Measures to prevent pinholes: a. It is strictly prohibited to use polluted cast aluminum alloy materials, materials
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Prevention methods of casting crack defects of cast iron
Features: the surface of the casting has straight or curved cracks. There are two kinds of cracks: hot crack and
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Characteristics and remedy of segregation defects in sand casting
Defect characteristics and detection methods In the center and upper part of the thick part of the casting, there are
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Causes and prevention of anti white defects in ductile iron casting
Anti whitemouth phenomenon On the section of iron castings, the opposite phenomenon of normal section appears. In the central part
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Brief introduction of casting and forming technology
Casting is the process of melting metal into a liquid that meets certain requirements and pouring it into the mold.
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Sand casting is widely used
Sand casting is a kind of traditional casting technology which takes sand as the main molding material to make the
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Prevention of sand sticking defects in cast iron
Features: the surface of the casting is bonded with a layer of molding material that is difficult to clean. There
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Floating defect of graphite in ductile iron casting
Graphite floating means that there are a large number of graphite balls on the upper surface of the casting, and
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What about casting coating without film
If the die is not hung, it means poor coating and hanging. The reasons for poor coating and hanging should
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Engine casting cylinder block and head
With the rapid development of China’s automobile manufacturing industry, many high-end automobile brands have been launched almost at the same
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Improvement measures for loose and under cast defects of regulating and sealing pieces
In the process, the asbestos is wrapped on the mold shell for treatment (as shown in Figure 5), that is,
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Prevention methods of shrinkage cavity and porosity in cast iron
Features: in the thick section of the casting, hot spot or axis and other places of the final solidification, rough
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Characteristics and remedy of under casting defects in sand casting
Defect characteristics and detection methods It shows that the sharp angle, edge angle, thin section and narrow gap of the
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Effect of water-based zircon powder flow coating performance
When the dosage of HB type suspending agent is 1 phr, the suspending property has reached 97%. The surface strength
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The slag inclusion in ductile iron casting
There are three types of slag addition: the first type of coarse slag is 2mg · SiO2 + MGS or
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Prevention and treatment of the subcutaneous porosity in ductile iron casting
The following measures can be taken: (1) When wet casting is adopted, the moisture content in the sand must be
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Features, causes and prevention of the uneven hardness and coarse graphite defects of the castings
Features: Coarse graphite: the size of graphite in the metallographic structure is very large, or there is massive graphite, and
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Characteristics and remedy of cold crack and warpage in sand casting
Defect characteristics and detection methods 1.Cold crack It is also a straight or curved crack on the surface of the
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Defect characteristics, causes and prevention of lower core of casting
Features: Poor lower core (core deviation, core dropping, sand squeezing and core breaking) Causes: A. Mask is not adjusted well,
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Analysis on the defects of loose and under cast thin wall castings
When the wall thickness of high-temperature alloy castings such as adjusting piece and sealing piece is changed from 1.1mm to
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Characteristics and remedy of hot crack in sand casting
Defect characteristics and detection methods It is a straight crack on the casting. The surface of the crack is strongly
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The phenomenon and cause of air hole under the skin of ball milled cast iron
Phenomenon One of the most common defects in the production of nodular cast iron is subcutaneous porosity. Subcutaneous porosity is
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Characteristics and remedy of shrinkage defects in sand casting
Defect characteristics and detection methods 1.External shrinkage cavity It is a depression exposed on the casting. The rough formation of