Cracking - Soluble Wax

Description

Defect Type

Negative

Appearance

Sharp linear

Size

Varies

Typical Location

Change in section or area restricted by features of the die or core

Method for defect determination

Visual inspection

Mechanism

Release of internal or externally applied stress

Corrections

Area	Possible Cause	Potential Correction
Equipment	Out of calibration	See Best Practices Section
Equipment	Cold platen	Increase platen temperature.
Equipment	Excessive cycle time	Decrease cycle time
Equipment	Hot wax	Reduce wax injection temperature
Equipment	Clamp opening too fast	Reduce clamp opening speed
Pattern Die	Cold die	Increase die temperature
Pattern Die	Burr in die	Have too maker remove burrs
Pattern Die	Die mismatch	Check guide pins for wear or improper alignment.
Wax	Filler separation	Check for proper agitation of wax. Discard suspect wax. Check temperature during conditioning process.
Other	Opening Die too fast	Reduce speed of die opening
Other	Improper removal of pattern	Proper training of personnel for pattern removal technique and tools. Note: Use a gentle air assist by blowing along the parting line loosen from die. Always make sure the pattern is being withdrawn evenly. Apply even pressure to avoid bending pattern.