- 업종: Software
- Number of terms: 1241
- Number of blossaries: 0
- Company Profile:
Moldflow develops plastic injection molding software.
Shear is a type of deformation caused by friction between the moving plastic and the mould wall.
Industry:Software
Shear stress is caused by friction between the moving plastic and the mould wall and between the layers of plastic moving at different rates. High shear stress can cause the plastic to degrade or to fail, due to stress cracks.
Industry:Software
Shrinkage is the reduction in the dimensions of a plastic part, compared with the mould dimensions. Shrinkage occurs as the polymer cools. Shrinkage can vary in different directions.
Crystalline and semi-crystalline materials are particularly prone to thermal shrinkage; amorphous materials tend to shrink less. Excessive shrinkage can be caused by the following factors:
*Low injection pressure.
*Short pack-hold time or cooling time.
*High melt temperature.
*High mould temperature.
*Low holding pressure.
Industry:Software
STL (stereolithography) is a tessellated representation of the surfaces of a solid, using triangles. STL was initially used in rapid prototyping. STL files can be in either ASCII or binary format. All major CAD/CAM systems can generate an STL file of a solid model.
Industry:Software
Tensile strength is the maximum nominal stress sustained by a material being pulled from both ends, at a specified temperature and at a specified rate of stretching.
Industry:Software
The appearance of this surface defect is similar to the grooves on a record. Record grooves are formed when a high flow resistance exists in the mold, thus leading to a repeated temporary stagnation of the flow fronts.
To prevent this defect, the mould and melt temperatures should be increased while decreasing the injection time.
Industry:Software
The end of fill occurs when the polymer has reached the extremities of the mould cavity and the mould is volumetrically filled.
Industry:Software
The fan gate is the opening between the mould runner and the mould cavity which has the shape of a fan. This shape helps reduce stress concentrations in the gate area by spreading the opening over a wider area.
Industry:Software
The finger gate is used when presentation is important and you want to avoid disfiguring the top face of a part. It tunnels down from the parting plane and comes up on the underside of the part.
This gate is also known by the following names: banana, winkle, cow-horn, bent-tunnel gate and cashew.
Industry:Software
