Causes of shrinkage casting defects of nodular cast iron piston rings and preventive measures
Although the upper and lower wall thickness of the cylinder is relatively uniform when casting the nodular iron ring, the […]
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casting defects
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Brief introduction of casting defects of spiral bevel gear
Formation mechanism of shrinkage cavity and porosity during solidification of castings The volume shrinkage during solidification is the cause of
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Prevention method of porosity in cast iron
Cast iron castings often have various casting defects. How to prevent these defects has always been the concern of casting
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Causes and preventive measures of casting defects caused by air holes under the skin of nodular cast iron piston rings
In cylinder casting, the subcutaneous pores are mainly distributed at the position of L ~ zmrn under the outer circular
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Measures to prevent shrinkage and porosity in ductile iron casting
1.The content of carbon, silicon, manganese, rare earth and magnesium must be appropriate. High carbon content can reduce the tendency
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Defect characteristics, causes and prevention of insufficient elongation of castings
Causes: A. The composition of molten iron is unreasonable. B. Shrinkage cavity and porosity at the tensile position of the
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The spheroidizing decay defect of ductile iron casting and its prevention
The characteristics of spheroidization decline: good spheroidization before furnace, poor spheroidization on castings; or good spheroidization of castings poured first
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Improvement measures for cracks in low pressure casting of auto parts
1) The reasonable design of the riser, the heat preservation sleeve and the casting pouring system constitute the riser system,
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Influencing factors of crack formation in low pressure casting of automobile parts
In the casting of automobile parts, the wheel casting is a little different. Because it needs to meet a series
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Characteristics, causes and prevention of casting cold insulation defects
Features: The appearance of the casting is incomplete, with a crack like gap or broken flow, and the metal edge
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Defects of sand inclusion and scab in steel casting and preventive measures
Sand inclusion refers to that there is a layer of metal lump or sheet on the surface of the casting,
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Surface casting defects of die casting (part 3)
7 Discoloration and spots (1) characteristics: There are different colors and spots on the casting surface. (2) Causes: ① Improper
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Prediction of several main casting defects
1) Prediction of shrinkage porosity and porosity Shrinkage cavity and shrinkage porosity are the holes that appear when the temperature
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Surface casting defects of die casting (part 2)
4.Casting deformation (1) characteristics: ① Overall deformation or local deformation; ② the geometric drawing of the die casting is inconsistent.
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Surface casting defects of die casting (part 1)
1 casting strain (1) characteristics: ① Along the opening direction, the surface of the casting shows a line like scratch
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Prevention methods of non spheroidizing or bad spheroidizing defects of ductile iron parts
Features: the fracture surface of the casting is gray black, and the mechanical properties are obviously low. Through metallographic examination,
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Influence factors of die casting defects
Thinking of solving die casting defects Because the causes of each defect come from many different influencing factors, so in
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Prevention of graphite floatation defects in iron castings
Features: a layer of clear and dense black spots can be seen on the upper surface of the fracture surface
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Review the rationality of casting structure from the aspect of avoiding defects
The casting process of part structure usually refers to that the structure of the part itself should meet the requirements
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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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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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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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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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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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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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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, causes and prevention of casting white edge defects
Features: The white cast is hard and brittle, and it is difficult to break and turn white Causes: A. Casting