Micro Molding
methods is that parts can be fi lled with the same software and same modeling methods. Flow analysis and modeling parts fl owing through a 0.02" (500-µm) gate is very different from parts fl owing through a 0.003" (75-µm) equivalent gate.
NEW
The power of an optical comparator, meets the precision of digital video.
The HDV300 is an innovative new video based measurement system combining the power of the Optical Comparator with digital video, hi-resolution cameras, telecentric optics and LED illumination.
Eliminate overlay templates by utilizing digital overlay part design files (DXF). Intuitive M3 programming power and simple operator display interface makes part measuring efficient and highly productive.
The difference between a part going through a 75-µm
Introducing the HDV300 Video-based Measurement System
equivalent gate vs. a 500-µm equivalent gate is that it sees much more thermal energy from the shear heat pushing through that small orifi ce. As a result, the solid model mesh res- olution is required to be extremely high to determine what is happening in the gate and thin-walled areas. Similar to this is using an inspection gage requiring one decimal point higher of resolution than the specifi cation requires: The mesh of a solid model used in a mold fl ow simula- tion requires single-digit micron mesh when tens-of-microns mesh are required in the part. Another important factor in a mold
fl ow or thermal simulation is process- ing knowledge and direct application knowledge with injection molding and mold making. It is important to know the practical experiences in these processing techniques along with the mold and die design to accurately depict proper mold fl ow. Knowledge in plastics engineering, micro mold design, gate location and size, and runner and sprue geometry is critical to proper analysis of the results of a micro mold fl ow simulation.
The Enabler: Precision Molds and Tooling Process-specifi c and material-specifi c
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knowledge helps to draw from experi- ence. Critical to many micro molded components, the gates will have to be properly sized so as not to place undue heat stress on the material entering the cavity. For heat-sensitive materials such as bioresorbable and biopharmaceuti- cal polymers, the residence time in the injection barrel, nozzle, and hot runner is important to understand and to minimize such that additional heat is not placed on the material during processing. These factors are important for theoretical fi lling and starting out with a solid process plan is one step in the right direction. The
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