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hot melt extrusion

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Published: 30 September 2023
Figure 10.20: Hot extrusion with gradually melting polymer lubricant. More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.ex2.t69980323
EISBN: 978-1-62708-342-3
... Abstract The machinery and equipment required for rod and tube extrusion is determined by the specific extrusion process. This chapter provides a detailed description of the design requirements and principles of machinery and equipment for direct and indirect hot extrusion. It then covers...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.ex2.t69980141
EISBN: 978-1-62708-342-3
... of martensite is mainly known in the behavior of steels, but it does occur in other materials, including α-β brasses. 4.2.4 Melting and Casting Processes The structure in the billet is very important for the extrusion process. It has a strong influence on the extrusion load, the maximum possible...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.ex2.9781627083423
EISBN: 978-1-62708-342-3
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.ex2.t69980195
EISBN: 978-1-62708-342-3
... Abstract Compared with other deformation processes used to produce semifinished products, the hot-working extrusion process has the advantage of applying pure compressive forces in all three force directions, enhancing workability. The available variations in the extrusion process enable a wide...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2000
DOI: 10.31399/asm.tb.aet.t68260119
EISBN: 978-1-62708-336-2
... before extrusion. The as-cast condition gives a product of unsatisfactory quality and has a lower workability for the following reasons ( Ref 18 ): Grain-boundary and dendritic cell segregation, low-melting-point eutectics, and brittle intermetallic compounds reduce the workability of the metal...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.t59390284
EISBN: 978-1-62708-459-8
... temperature in hot extrusion is usually high, partly to reduce flow strength and thus allow a large extrusion ratio, and partly to ensure adequate ductility. The temperature rise due to deformation and friction could heat the emerging product to near or even above the melting point (or, in alloys, above...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240279
EISBN: 978-1-62708-251-8
... hot. Secondary processes, which are used to produce the final product shape, are conducted either hot or cold. The chapter discusses the primary objectives, principal types, advantages, and disadvantages of both primary and secondary metalworking processes. They are rolling, forging, extrusion, sheet...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 June 2023
DOI: 10.31399/asm.tb.atia.t59340063
EISBN: 978-1-62708-427-7
... on the subsequent fabrication process—for instance, rectangular for rolling or round for extrusion ingot. During molten metal processing (MMP), aluminum undergoes a series of operations ( Fig. 4.1 ) that determine the alloy composition and influence the cost and quality of the final product: Melting...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.tb.ems.t53730139
EISBN: 978-1-62708-283-9
... are: Lubrication is more difficult. Although viscous glasses often are used in hot extrusions, most hot working is done without any lubrication. The work metal tends to oxidize. Scaling of steel and copper alloys causes loss of metal and roughened surfaces. Although processing under inert atmosphere is possible...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2012
DOI: 10.31399/asm.tb.lmub.t53550299
EISBN: 978-1-62708-307-2
... include induction skull melting, vacuum arc melting, and plasma melting. Other methods under study include mechanical alloying, spray forming, shock reactive synthesis, physical vapor deposition, and hot pressing and rolling of elemental sheet into multilayer composite sheets. By appropriate...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.ex2.t69980417
EISBN: 978-1-62708-342-3
... Abstract This chapter begins with a description of the requirements of tooling and tooling material for hot extrusion. It covers the processes of designing tool and die sets for direct and indirect extrusion. Next, the chapter provides information on extrusion tooling and die sets for direct...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2000
DOI: 10.31399/asm.tb.aet.t68260187
EISBN: 978-1-62708-336-2
... and the characteristics of that particular alloy. Because the safe hot-working temperature range of any hard alloy is comparatively quite small, it is important to handle the variables such that the final temperature of the extrusion does not exceed the incipient melting temperature of that particular alloy. Some...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060117
EISBN: 978-1-62708-261-7
... are, to a large extent, dependent on the extrusion temperature. Cold (room-temperature) extrusion is economically feasible for low-melting alloys and some aluminum alloys, while hot extrusion is required for harder alloys. Hot Extrusion Technology Prerolled billets or round ingots can be worked...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.ex2.t69980001
EISBN: 978-1-62708-342-3
... are discussed in this book. Historic Development of Extrusion Joseph Bramah described in a patent in 1797 a “press for the production of pipes of a specific diameter and length without joints in lead and other soft metals” ( Fig. 1.4 ). Joseph Bramah used liquid lead forced from a melting vessel...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230163
EISBN: 978-1-62708-298-3
... that are directed at the elimination of a low-melting eutectic, which leads to hot shortness, by bonding of aluminum or silicon, the main components of this low-melting eutectic, into refractory compounds The first four alloying approaches have not led to any great success. The fifth approach has resulted...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 June 2023
DOI: 10.31399/asm.tb.atia.t59340143
EISBN: 978-1-62708-427-7
... Abstract Aluminum shapes, rod, bar, tubes, and wire may be produced directly as extrusions or by subsequent processing of continuous cast stock. This chapter describes the key aspects of aluminum extrusion and wire production focusing on the more common hot extrusion process and presenting...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.ex2.t69980059
EISBN: 978-1-62708-342-3
... Abstract This chapter opens with a discussion of the classification of rod and tube extrusion processes. The standard processes involve hot working (extrusion at temperatures above room temperature), but some specialized cold working processes are also used for rod and tube extrusion. The next...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280117
EISBN: 978-1-62708-267-9
... to superalloys. It describes the gas, vacuum, and centrifugal atomization processes used to make commercial superalloy powders. It explains how the powders are consolidated into preforms or billets using hot isostatic pressing, extrusion, or a combination of the two. It also provides information on spray forming...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2013
DOI: 10.31399/asm.tb.mfub.t53740103
EISBN: 978-1-62708-308-9
..., including open-die and closed-die forging, hot upset and roll forging, high-energy-rate forging, ring rolling, rotary swaging, radial and orbital forging, isothermal and hot-die forging, precision forging, and cold forging. The chapter also includes information on cold and hot extrusion and drawing...