Identification
Maintain the weight
Avoid damage of pattern
Avoid weaken the strength
Treat the particular surface
Improve the weight
Improve the strength
Improve the working qualities
Core in irregular shape
Core in rectangular shape
Core in concave shape
Core in convex shape
According to shape and size
Pattern allowance
Structure of pattern
Production of casting
Prepare the pattern single piece
Prepare the pattern more than three pieces
Prepare the pattern more than four pieces
Prepare the pattern in more than two pieces