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WeiBen Machinery
Sand Casting Defects
8 6 月, 2017
Production of castings involves a large number of steps including casting design, pattern making, moulding, melting, pouring, shake out, fettling, inspection and finishing.-
- It is not uncommon for one or more of these steps to be performed unsatisfactorily due to use of defective material or equipment, carelessness of the operator or lack of skill.
- Such unsatisfactory operations result in a defective casting which may be rejected at the final stage.
- Since reclamation of defective castings is often costly and sometimes outright impossible, care should be taken to avoid the occurrence of the defects in the first instance.
- It is therefore necessary to understand the various defects that occur in sand castings and the main factors that are responsible for their occurrence.
- Some of the common defects are described below.
- Open Blows and Blow Holes
- Pin Hole Porosity
- Entrapped Air and other gases
- Cracked Casting
- Bent or Twisted Casting
- Dropped Mould
- Fusion
- Swell
- Run out
- Mismatch
- Mis-run and Cold Shut
- Shrinkage-Faults
- Rat Tail and Buckles
- Core Shift
- Inclusions
- Cuts and Washes
- Metal penetration
- Hard Spots
- Scabs
- Hot tears
Others
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Cassie
Sales Manager