Solutions for:
Bent Ejector Pins
Most die casting plants have experienced the problem of bent or broken ejector pins.
The die opens and the ejector plate goes forward but one or more of the pins ends up bent like a banana behind the moving die block. Sometimes they snap off completely. Sometimes the end of a pin becomes bent and it gets dragged back into the ejector pin hole where it does damage to the cavity. The casting is often completely destroyed. Sometimes the die keeps functioning with a snapped off pin which causes a protrusion to the part. The cost to sort the parts and repair the die can be very high.
There are several potential causes of bent and broken ejector pins and it often takes quite some time to narrow it down:
- Lack of lubrication
- Damaged die cavities
- Soldering
- Die cooling problems
- Poor quality ejector pins
- Inadequate draft
- Poor die design
- Poor part design
- Wear in the die
A technique which has been pioneered by HotFlo! is to measure the actual force which is on the pin when the part is being ejected. By having actual data to work with, the root cause can be ascertained and corrected much quicker.
To find out more, contact us by email today.