2015年8月10日 星期一
2015年8月9日 星期日
Injection Molding: Troubleshooting
Approach to Troubleshooting
Proper troubleshooting should use a systematic approach to resolve problems. There are two kinds of issues: those involving "quality control" and those encountered during startup.
"Quality control" issues occur when parts have been successfully produced in the past, but are now out of specification. These problems are the result of something in the process changing.
To resolve them, one must determine what has changed and restore the process to its proper balance. Startup problems occur during the launch of a new tool or machine.
Quality Control Issues
Most quality control issues are caused by process conditions, the material, or machine and tool maintenance. If the problem occurred after a change in the material lot number, try a different lot of material. It is advisable to store a retain of the previous lot of material.
If the mold setting is from a previously successful part, check the original setup conditions. If the mold is used in a different machine, minor adjustments to account for the new machine may be needed. If the mold was modified during its downtime, process adjustments may be required.
Startup Issues
To resolve startup problems, the material's process window must first be determined to ensure that there is a set of conditions that can make good parts.
Start by setting the process conditions to the middle of the material's process range and then adjust the process to fix any observed problems. If successful parts are not possible, determine what combination of variables must be changed to resolve the problems. These changes may include material selection, machine selection, and/or tool redesign.
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