Feb 7, 2019
The development of designs using a computer is called CAD (short for Computer Aided Design).
This includes all computer-aided activities in a design process.
There is a differentiation between 2D and 3D CAD systems according to the available software and the aim.
3D CAD systems can be differentiated into wireframe- surface- and solid modelling tools.
In common CAD systems a mixture of all of the discussed modules can be found.
The design is mostly done in 3D while a 2D drawing can be extracted based on the given model.
Typical data formats are Step (.stp or .step) to exchange models between CAD systems as well as STL (.stl) if it comes to simulation or rapid prototyping.
General: Display of a CAD user interface
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Oct 18, 2019
An imaging procedure in radiology is computer tomography, short CT.
The test object is placed hereby on a turntable between an X-ray source and a high-resolution area detector. From the step-by-step 360 degree rotating test object, a 2D projection image is taken for each angular position. A powerful software calculates from these images the absorption behavior for each location in the test object.
The absorption behavior is visualized at each volume element (voxel) with gray values. Each gray value represents a different material density. Finally, these single elements are assembled into a 3D solid model.
The process is used in the plastics industry to determine the exact dimensions of a part, making it easier to identify tolerances that differ from the desired geometry.
Furthermore it is possible to cut through the part to identify defects on the inside (e.g. voids).
Measuring technology: Functionality of computer tomography
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Target-Actual Comparison
X-Ray
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Dec 9, 2021
Concentricity refers to a center of circular surfaces if the diameter of a cylinder is smaller than its hight.
In this case, for example, the center of a hole must be inside a circle of the specified diameter.
This applies around a reference point in the cross section.
For coaxiality, the axis of a selected diameter must be within a tolerance zone, which is represented by a cylinder of given diameter.
The axis or directional normal must lie on a common reference axis A-B.
The rule that cylinders with diameters greater than their height are tolerated via concentricity serves to distinguish the two terms.
Otherwise, coaxiality is tolerated.
Quality Assurance: The axis of the diameter must be within a cylinder of 0.02mm (reference axis A-B)
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Oct 13, 2020
There are plastics (like Polyamide) which are brittle in the dry condition (water proportion < 0.2 %).
The plastic part gets more elastic when water up to 3.5 % is absorpt.
The storage and water absorption in moistured athmosphere or in a water bath until the weight is consistent is called conditioning.
The conditioning occurs by diffusion and may take several days.
The process is reversible.
A polyamide is elastic after
conditioning.
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Dec 6, 2018
For complex parts, conventional cooling is not sufficient enough to achieve a uniform heat dissipation.
Here it is necessary to build the cooling system close to contour along the cavity.
This can be done by laser cusing and high temperature brazing.
These technologies allow to realize a good cooling system even in tight areas.
Conformal Cooling results generally in a reduction of cycle time and warpage.
