Aluminum extrusion design 6 mistakes designers make and how. N2 aluminium extrusion is an industrial forming process that is used to produce long profiles of a constant crosssection. The effect of following the constant surface area rule are calculated. Aluminum extrusion manual table of contents for the digital edition of aec aluminum extrusion manual 4th edition. As a reminder, tolerance is used to control the amount of variation inherent in all manufactured parts, in particularly for mating parts in an assembly. Computeraided design and manufacturing battelle, columbus. An applied approach to extrusion theory this book contains material which is background to this course. The process is now associated with thermoplastics materials although it was first practiced with rubbery polymers to produce an extrudate with different colored layers. Choose additional resources key to the design and specification of extrusion based components. In direct extrusion, the direction of metal flow will be in the same direction as ram travel. Processing guidelines for the extrusion of thermoplastic.
Casexpert a process planning system with feature based. Schematic of direct and indirect extrusion of aluminum alloys without a lubricant 14 12. It is relevant to all types of extruded human foods and animal feeds. Some cross sections, when extruded, will produce undesirable force distributions and metal flow. Experience our interactive, profoundly engaging digital publication. Back pressure recommended back pressure measured in the extruder head should be a minimum of 50 bar 725 psi to guarantee a constant melt flow. The system has been successfully tested, it has been proved that the system can reduce planning time and respond high consistent plans. For the love of physics walter lewin may 16, 2011 duration. Stevenson, in comprehensive polymer science and supplements, 1989. Cad implementation of design rules for aluminium extrusion. The tpc system consistently reduces extrusion times by 1020%. Some basic guidelines in profile design minimize extrusion problems. In design, the width should be taken into account in relation to the depth. In many cases, small design changes can drastically improve or degrade the extrudability of the product.
Understand the key variables and limitations for aluminum extrusion design. The first edition, translated from german in 1984, filled a longstanding void in the plastics technical literature. The definitive processing guide and handbook plastics design library jr harold f. During this process, the billet slides relative to the walls of the container. The common feature of all the extrusion head designs is that each extrusion head has a parallel polymer flow zone i. The resulting frictional force increases the ram pressure considerably. The molten material is forced through a slit due downward between two rolls. The extrusion process is used as an economical means of producing long strands or filaments of solid and annular crosssections. Introduction the extrusion head is the processing tool that shapes the extrudate i. Apply best practices in extruded part design, to optimize functionality and production economics. During direct extrusion, the load or pressuredisplacement. However for this to be done effectively, you need the right equipment and the right extrusion parameters.
Design of extrusion heads lublin university of technology. Wallmaterial thickness uniform wall thickness wallmaterial variance radius vs. May 15, 2015 this video shows work in the new quantorforms software qexdd. The extrusioncoating process is illustrated in figure 5. Relation between extrusion rate and flow stress for various aluminum alloy. More consistent operation of the press increases recovery rates and reduces cycle times. Hydrostatic extrusion the billet is smaller in diameter that the chamber, which is filled with a fluid and the pressure, is transmitted to the billet by a ram. Our talented engineering department is available to assist your design engineers with the specifics in extrusion design. Extrusion of tpu tpus can be, and are, processed by a variety of techniques including thermoplastic extrusion.
During this process, the billet slides relative to the walls of the. Important issues in the design of tubing tooling are the various draw ratios that define the tooling and the extrusion process. Since extrusion time typically represents 65% of the extrusion process, this translates into an overall productivity gain of 7%. The most likely locations of thermal linesstripes and visual and physical defects due to the extrusion method can be marked in the profile drawings, if necessary. Recognize the range of applications where extrusions can have. Casexpert a process planning system with feature based neural. In the literature survey, the major problems isolated were. Extrusion, comsol, solid edge, flow rate, output, density. Tpu pellets are compacted and fluxed in the extruder barrel not shown but perpendicular to the place of the paper. The project consisted of studying melt flow characteristics of plastics and how the. Aluminum extrusion design 6 mistakes designers make and. With the application of cold extrusion technology, the precision and surface quality of the product is increased.
Tooling design for tubing is a critical issue in tubing extrusion but there is limited useful information available. Tooling design for tubing extrusion tooling development. It is here that the extrusion takes shape and features are built in to reduce weight, simplify assembly, add functionality and minimize finishing costs. Extrusion is of vital importance to all plastics processing. First, aluminum offers many unique properties, such as its high strengthtoweight ratio, corrosion resistance, and electric conductivity, to.