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Stamp Punch
Die Protection System In Metal Stamping Industry
Die protection system in high speed metal stampings.Die Protection system is used to protect your progressive die in the case of any unexpected event. These events can be misfeed, strip buckle, double hits, slug up, broken punch etc.
A mis-feed pilot is used in most of the tool shops for tool protection since the last four decades. Today, many conventional tool shops are still using it. The micro switch connected to the machine e-stop. The micro switch cut off the power supply and eventually stops the machine when the pilot activated the micro switch when misfeed is detected. This method usually applied to low speed conventional stamping with 50-100 spm.
In today market, stamping machines are running in much more faster speed. Misfeed pilot is no longer sufficient in die protection. Double hit, slug up and strip buckle is no way to be detected by this method.
A Photoelectric fork light sensor is commonly used for reel to reel high speed stamping industry. This fork sensor is a through-beam photosensor with a pre-aligned emitter and receiver permanently housed in a U shaped cast metal case. The sensor is installed either within the tool or at the end of the tool, to detect either a hole or the edge of the strip, it is programmable to count number of passes during one machine cycle according to number of out the tool is running.
The counting is done during the feeding of stock material before the punching stroke take place. Electronic signal will pass to the controller to stop the machine when the actual counting does not match the pre-set number. As such, misfeed can be detected immediately before the punching ram is actually descended down. It is a great way to detect misfeed in the high speed stamping environment. However, this method is not able to detect slug up and broken punch effectively.
Another type of die protection system is widely used in the Precision metal stamping industry industry, a sensor is mounted at the die plate or spring stripper to monitors the gap between the stripper and die surface. This gap can be as fine as .00004 inches (1/1000mm), By monitoring these subtle deviations in stripper position or die height, it can detects misfeeds, pulled slugs, double hits or other abnormal conditions. The protection system can be applied to any stamping operation with speeds up to 2500 machine cycles per minute (SPM).
Once the machine is at production speed, the upper and lower limits are automatically adjusted based on your stamping process. Unfortunately, the detection will happen always after the punch and die is in contact. In short, damages had already done to the tool.
The combination of both methods in one tool is advisable for die protection in the high speed stamping industry.
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Can a primer be stamped flat after use?
THIS IS NOT FOR REUSE
I want a safe flat primer for a "decoration" piece. Is this possible to buy or punch back into place?
Yes it's possible, the primer would have to be removed first, there's no way to get a punch through the primer flash hole to tap the primer flat again, with the anvil of the primer in the way.
Stamping - Card with Punches- Stampin' Up!