Dimensional tolerance of fixture casting
Dimensional tolerance of castings refers to the difference between two allowable limit dimensions of nominal dimensions of castings. Within two […]
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Prevention of sand hole and casting slag defects in cast iron
Features: small holes filled with mold (core) sand inside or on the surface of defects are called sand holes. If
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Determination of casting process plan for fixture casting
Production conditions, structure and technical requirements of fixture Product production nature – mass production Part material – 35Cr The part
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Raw materials for green sand in sand casting
Green sand is composed of original sand, clay, additives and water in a certain proportion. The commonly used feeding sequence
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History and development of investment casting technology in China
Lost wax casting is now called investment casting. It is a kind of casting technology with little or no cutting.
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Characteristics of metal casting, sand casting and die casting
Casting can also be divided into gravity casting and pressure casting according to the pouring process of liquid metal. Gravity
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The engine cylinder block and cylinder head produce the casting veins
Usually in the inner surface or hot spot of the casting, such as the water jacket cavity of the cylinder
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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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Characteristics of wet mold and dry mold sand casting
Clay sand mold can be divided into wet mold, dry mold and surface drying mold. The main differences among the
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Casting process design of casting mould
In casting production, mold is very important. All kinds of process knowledge we talked about before should be included in
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Properties of good casting sand
The material used to make sand mold is called molding material, the material used to make sand mold is called
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Casting process pouring riser, chill and cast steel bar
Using riser, chill and cast steel bar to obtain high quality castings is a common technological measure in foundry production.
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The engine cylinder block and cylinder head produce casting sand holes
Sand hole is also a common defect of cylinder block (cylinder head) casting, which is often found on the upper
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The main factors of cracks in aluminum alloy wheel during low pressure casting
For the same alloy, whether the hub cracks or not often depends on the hub structure, process parameters and mold
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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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Sand casting – machine modeling
Machine modeling — the molding machine completes the main actions of sand filling, compaction and touching during the molding process.
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The explanation of the type of gating system in casting process
(1) According to the position of the choke section A closed gating system The closed gating system refers to the
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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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The history and development of foundry technology in China
Casting is the process of melting metal into a liquid that meets certain requirements and pouring it into the mold.
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Design of gating system and inner runner in casting process
Gating system design： 1.Design of sprue cup (1) Sprue cup shape The shape of sprue cup can be divided into
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Analysis of common defects in castings
Casting porosity This is a small cavity formed by the gas which can not escape during the solidification of metal.
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Sand casting – hand molding
Manual modeling definition – all modeling operations completed by hand or hand tools are called manual modeling. Advantages and disadvantages:
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Design of casting process parameters
1.Casting shrinkage There are many factors that affect the casting shrinkage, such as the type and composition of the alloy,
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Engine cylinder block and cylinder head produce casting porosity
Porosity is usually the most common defect in cylinder block castings, which often takes the first place in the scrap
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Design of sand core for parts casting
The design of sand core is very important in the casting process, which directly affects the dimensional accuracy of castings
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Common measuring tools for sand casting
1 tape measure: Used to measure length. 2 steel ruler: It is a common measuring tool for measuring length, outer
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Selection of parting surface for casting parts
Parting surface refers to the surface on which two half molds contact each other. In addition to the solid casting
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Causes of crack formation in aluminum alloy wheel during low pressure casting
Low pressure casting can realize high mechanization and automation, not only improve the productivity (10-15 type / h), but also
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Common repair tools for sand casting
In order to make the sand mold (core) qualified, the defects of the sand mold (core) should be repaired with
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Determination of pouring position of sand casting
The pouring position of casting refers to the position of casting in the mold during pouring. The determination of pouring