Relationship between casting quality and porosity
1) Reasonable selection of casting alloy and casting structure. 2) Make reasonable technical requirements for castings (defects are allowed and […]
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The major defects of common castings and their causes
1.Porosity Features There are smooth holes of different sizes on the inner or surface of the casting. Main causes ①
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Working principle of electric globe valve
Overview of electric globe valve: The electric stop valve is installed with electric actuator on the basis of the globe
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Measures to reduce surface carburization of EPC steel castings
The factors influencing the surface carburization of EPC steel casting include the composition of molten steel, the thickness of casting
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Characteristics and remedy of cold shut defect in sand casting
Defect characteristics and detection methods The appearance is the striated or herringbone pits that are not closed by the alloy
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Identification of wrong mold, wrong core and deviated core in sand casting
1) Identification of wrong pattern in sand casting Wrong mold is the defect that one part of the casting and
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The phenomenon and mechanism of Carburization on the surface of EPC steel casting
In the production of steel castings by EPC, the surface carburization of castings has been a controversial topic. When EPS
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Defect characteristics and remedy of oxidation slag inclusion in sand casting
Defect characteristics and detection methods Slag inclusions with gray and gray black fracture are often found in the parts or
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Characteristics and remedy of slag inclusion in sand casting
Defect characteristics and detection methods Dark gray clusters or single distribution on the upper horizontal surface of the casting, or
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Identification of shrinkage cavity and porosity in sand casting
Shrinkage cavity and porosity are the most common defects in castings. Shrinkage cavity is produced by poor feeding during solidification
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Working principle of pneumatic globe valve
Working principle of pneumatic globe valve: Pneumatic globe valve is a valve with compressed air as the power source. It
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The measures to eliminate cracks in aluminum alloy wheel of low pressure casting
1) Reasonable design of liquid lifting system Because the holding time is too long, or the liquid in the lifting
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Characteristics and remedy of pinhole defects in sand casting
Defect characteristics and detection methods It is a small round or fly shaped hole of different sizes with needle tip
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Characteristics and remedy of porosity in sand casting
Defect characteristics and detection methods Small holes in the surface and inside of the casting. Its surface is generally smooth,
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The difference between the blank of die casting and extrusion casting
In terms of shape, it is difficult to distinguish the blanks produced by these two processes. If you see a
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Analysis of common problems in sand casting
There are many casting production processes, so it is easy to produce various defects. Some of the defective products can
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Some people say your casting is expensive, the more you have to answer
Some people say that your casting is expensive, so you answer: Porsche and Land Rover are also very expensive, but
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Bellows globe valve results and characteristics
Bellows globe valve structure: The bellows globe valve is mainly changed from packing sealing to bellows sealing. The upper part
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Sealing characteristics and principle of eccentric butterfly valve
Basic knowledge of eccentric butterfly valve Eccentric butterfly valve can be divided into various types, generally single eccentric sealing butterfly
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Difference between globe valve and gate valve
Structurally: The length of the gate valve is shorter than the globe valve, and the height is higher than the
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The general summary of the causes of subcutaneous porosity in castings
The formation of subcutaneous pores is a comprehensive reaction of improper operation of each link and process in the casting
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The formation of cracks 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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Selection and application of eccentric butterfly valve
Eccentric butterfly valve and other butterfly valves have outstanding advantages, so they are widely used in all aspects of life
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What is the reason for the blackening of stainless steel plate after the treatment of weld bead treatment fluid
The reason for the blackening of the stainless steel plate after the treatment of the weld bead treatment fluid is
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Defects and remedial measures of stainless steel castings after heat treatment
For box type and trolley type resistance furnace plates, a high temperature tempering should be carried out before use, and
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Selection principle of probe in ultrasonic testing
There are many types of ultrasonic probes with different performances. Therefore, according to the shape of the ultrasonic testing object,
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Other treatment methods for coarse grain of castings
(1) The slow cooling rate is not only related to the design, pouring system and metal composition, but also related
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High carbon concentration in casting production and its prevention
Causes and hazards: if the carburizing is heated sharply, the temperature is too high, or if the solid carburizing is
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The principle of carburizing in casting process
Carburizing, like other chemical heat treatment, also includes three basic processes. 1 decomposition: the decomposition of carburizing medium produces active
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Treatment of coarse grain in castings caused by metal melting
When the melting operation is small, it will have an impact on the structure of the remaining particles. For different