Extrusion die design pdf

The two main advantages of this process over other manufacturing processes are its ability to create very complex crosssections, and to work materials that are brittle, because the material only encounters compressive and shear stresses. Chapter 2 describes the work conducted toward applying cadcam tech. The process is now associated with thermoplastics materials although it was first practiced with rubbery polymers to produce an extrudate with different colored layers. The advantage of an inhouse is that they are cost effective and can be tailored to the customers requirements. Stevenson, in comprehensive polymer science and supplements, 1989. The pocket allows realising the extrusion as billettobillet. Apply best practices in extruded part design, to optimize functionality and production economics.

The extrusion process is a multivariable system where product qualities e. The aluject controller mixes and measures the precise amount of lubricant needed by the sprayerduring the extrusion stroke, as the ram and the dummy block press the billet through the container, the oxides and other impurities from the skin of the billet are accumulated in the dead metal zone. 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. The resulting frictional force increases the ram pressure considerably. Only if the entire process is considered as an integrated system, with all parts working together in common cause, can maximum efficiency be approached. Design of extrusion heads lublin university of technology. Tooling design for tubing is a critical issue in tubing extrusion but there is limited useful information available. The polymer melt flows from extruder through a melt pipe at the bottom into the runners which guide it to the ports from where the spirals originate. Extrusion castools systems approach no single component of the extrusion production process should be examined or evaluated individually.

Drm1 and duro f1 are matrix high speed steels mhss which are. Important issues in the design of tubing tooling are the various draw ratios that define the tooling and the extrusion process. During direct extrusion, the load or pressuredisplacement. Casexpert a process planning system with feature based. The adapter section that connects with the output channel of the extruder 2. Recognize the range of applications where extrusions can have. In many cases, small design changes can drastically improve or degrade the extrudability of the product. The project consisted of studying melt flow characteristics of plastics and how the. Program approach the phasei work was completed by performing the following major tasks. Aluminum extrusion design 6 mistakes designers make and how. In design, the width should be taken into account in relation to the depth. During this process, the billet slides relative to the walls of the container. Understand the key variables and limitations for aluminum extrusion design. For an example, a reattached buildup of material in a wire coating extrusion may diminish the dielectric properties of the insulating material 1.

First, aluminum offers many unique properties, such as its high strengthtoweight ratio, corrosion resistance, and electric conductivity, to. Processing guidelines for the extrusion of thermoplastic. Choose additional resources key to the design and specification of extrusion based components. Our talented engineering department is available to assist your design engineers with the specifics in extrusion design. Schematic of extrusion tooling and extrusion insert detail courtesy hirschvogel, inc 6. Introduction the extrusion head is the processing tool that shapes the extrudate i. The plastic extrusion design guide is intended to help you optimize your plastic profile design and drive cost out of your part.

Aluminum extrusion design 6 mistakes designers make and. The melt from the extruder enters into the flange adapter from the breaker plate in the. In direct extrusion, the direction of metal flow will be in the same direction as ram travel. Internal deckles can be stepped to reduce the edge bead size.