Success Story
The customer challenge is to solve the problem "dimension out of tolerance ". The plastic part was molded by Poly(methyl methacrylate); PMMA (Transparent) with one brand of the high-end injection machine. In the 100% dimension inspection, the 1 dimension were shorter than the design tolerance -0.3 mm. The customer, Mitoyo Plastic, the Japanese Injection Molding manufacturer who produces plastic parts located in East Thailand. They have been purchased of our Moldflow consultant service to help them to verify the Moldflow analysis results in their DFM; Design For Manufacturing process.
The goal is to find the phenomenon of part dimension out of tolerance. The most important is mold steel should not change or minimal changes if necessary. Injection molding has many variables of influence to part size (dimension) such as gate size, shrinkage compensation with packing pressure, packing pressure time, mold surface temperature, etc. To succeed the part dimension in molding with minimal change of mold is making sure the shrinkage compensation work properly. We know well that Autodesk Moldflow software has a DOE; Design Of Experiment capability to help us to know what the variable is/are the most influence to dimension out of tolerance.
By our experience, the Practical DOE; Design Of Experiment of injection molding can be done by creating the matrix of suspected influences on the size (dimension). DOE needs the resources; machine, raw material, time, and manpower for the implementation. The real injection molding machine with DOE has a limitation in real production. To know the phenomenon of dimension influences, we use Autodesk Moldflow Insight DOE and Critical dimension to run the analysis and advise the customer about the matrix of the real experiment. This way can help the economy of the factory resources.
In the real DOE to find the phenomenon was choosing 3 variables of injection molding + 1 mold modification.; 1st the Melt Temperature, 2nd the mold surface Temperature, and 3rd Packing time and modify gate size to 0.300 mm wider and 0.200 mm thicker. The real DOE was done with the machine applied to the specified matrix by Autodesk Moldflow. The parts from real DOE were inspected after cooling down to room temperature from the 72 hours annealed process in the 90 C oven.
Jijo, the Engineering manager, did the DOE and called to inform us after 72 hours. The part dimension which was out of the tolerance of -0.300 mm was already solved. Jijo has been repeated use of our Autodesk Moldflow consultant for 3 years now.
The shorter dimension of -0.300 mm was solved, and the new injection molding condition passed the validation. The production continued. As is always the case in plastics injection molding, Autodesk Moldflow in this case is used for problem shooting. There are the right part design and the right mold design, Moldflow Software can help molders to prevent the problem and robust the process.
Project summary
Duration & delivery
Autodesk solutions
Services provided
Contact Partner Finder for help using the online search tool and more. The Autodesk Assistant can help with Autodesk products, answer questions, or send you to an agent.
Partner Finder Terms of Use
By accessing and using Partner Finder, you acknowledge and agree to the following Additional Terms as referenced in the Website Terms of Use: (i) Partner Finder may be modified, updated, interrupted, limited, suspended, or discontinued at any time without notice or liability; (ii) any query or request for information regarding a specific provider or provider services may be forwarded to that provider, however Autodesk in its discretion may retain a record to conduct business analytics to improve Partner Finder and other Autodesk products and services; (iii) Autodesk has no obligation to enforce any terms on your behalf against another user; and (iv) any feedback you provide in connection with a provider, including ratings or reviews, is a non-confidential “Submission” as defined in the Website Terms of Use. You are advised to conduct your own independent analysis and assessment of any information provided by or though Partner Finder, including whether a selected provider is appropriate for your particular circumstances. Without limiting the Website Terms of Use, Autodesk does not warrant, endorse, guarantee, or assume responsibility for any service advertised or offered by a provider through Partner Finder or any hyperlinked website or service. Autodesk is not liable for the content of this site, or for the consequences of any actions you may take based on information provided by, or through, this site. You release Autodesk and its affiliates and subsidiaries from all liability arising from your use of Partner Finder, including any hyperlinked website, service, or content.
Translation tool disclaimer
This page has been translated for your convenience using a machine translation service. Reasonable efforts have been made to provide an accurate translation; however, no automated translation is perfect nor is it intended to replace human translators. As a result, this translation may contain errors and inaccuracies. Autodesk provides no warranties, either express or implied, about the accuracy, reliability, or completeness of the machine translation and disclaims all liability for any losses or damages caused by, or resulting from your reliance on, this translation. The English version of this website is the official version.
