All plastic parts suffer deformations during cooling of the material after the injection process. The effect is called warpage. This problem is known by all mechanical design engineers and in development, each engineer tries to compensate this warpage using different design solutions. In this article we are analyzing one important solution for warpage compensation and we will present our results and the optimization steps that led us to the results. The solution is a step for a vertical wall of the housings. For this step we analyzed different dimensions and combinations to provide the best solution.
The EN62368 norm is a European standard that specifies the safety requirements and the testing procedures that all audio/video, information and communication technology equipment need to fulfil. In order to fulfil this standard, all mechanical engineers should change the way of designing the parts and respect new rules that can increase the cost of production for all plastic parts. These changes will lead to a higher tool complexity and high material costs. Plastic material suppliers are starting to change their focus and develop new V0 materials with better and eco-friendly properties according to the market needs. Plastic materials with flame retardant compounds (FR/V0 – classification according UL94) need to pass all flammability requirements and tests and according to environment regulations, the plastic materials that are halogen free are more are more requested. In general, halogen free systems produce less smoke and less toxic components in smoke. Benefits of halogen free V0 materials is a better flame-retardant property, low smoke toxicity, low smoke obscurity and no corrosive gases. The tool complexity will increase because we must reduce, even avoid, the openings in all plastic parts because they will allow oxygen to get inside the ECUs and oxygen is maintaining the flame, making a potential ignition source to increase her breadth. Reducing the openings in a plastic part, will lead to adding sliders inside of the mould and sliders involves higher costs. Although, depending on the current that goes through the ECU, we can recommend you some design modifications that will save money and time for your project.
The high-pressure pump is a component of the automotive common-rail system and has as main assemblies: housing, driveshaft, gaskets and front plate. Literature presents analyses of the threaded fastening assemblies, especially for those with the critical joints with screws, those involving torque and angle. The assembly process that we have studied performs the sealing of the components with the gasket through the screws, thus preventing the fuel from leaking from the pump. Our paper presents an analysis of the influence of the tightening process with screws of the housing, gasket and front plate. The experiment was conducted using the Zeiss measuring system and the screwdriver Janome. The tests analysis demonstrates that screwing process can influence the distortion.
In this paper we will present a mechanical study made on the design of thermal conductive plastic parts. Out of our study derived new design rules that are useful for mechanical design engineers that have to create parts built from this type of materials. We used Catia V6 software for modelling the parts and ANSYS Moldflow software to simulate the behaviour of real components. The solutions resulted from our trials are improving the quality of the parts built from thermal conductive plastics. The test and simulation results lead us to new rules for designing screw domes and rivets for thermal conductive plastic parts and reducing warpage effect with 75% on this kind of parts.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.