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Image
Published: 01 December 2008
Fig. 4 As illustrated, casting members may be used as feed paths for motten metal. The ribs in the original design (a) were too thin to permit adequate feeding of the bearing boss, causing it to be porous. By eliminating the center rib and distributing that metal to the two outer ribs (b More
Image
Published: 01 December 2008
Fig. 32 Feeding path design considerations. (a) Circular flat plate with a single riser. (b) Addition of wedge-shaped ribs to ensure proper solidification. (c) Branched ribs to overcome feeding problems at the circumference of the plate More
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0009023
EISBN: 978-1-62708-187-0
... Abstract This article addresses the problems of designing isolated heavy sections that are functionally essential. It describes the two most efficient solutions to these problems over which the designer has control: providing flow and feed paths and reducing the mass of the isolated sections...
Image
Published: 01 December 2008
Fig. 11 Uniform walls of this permanent mold cast aluminum piston (a) resulted in simultaneous freezing, which caused porosity and centerline shrinkage. By tapering the walls and adding ribs for metal feed paths to the bosses (b), acceptable castings were easily produced. More
Image
Published: 01 December 2008
Fig. 19 Casting design and solidification of a simple wedge. (a) Riser placed at narrow end of wedge; shrinkage occurs at wide end. The crosshatched region represents the approximate area of the casting where solidification is first complete, thus cutting off the feeding path of the casting More
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0009022
EISBN: 978-1-62708-187-0
..., or ribs or webs may be added to provide feed paths. The function of ribs or of sections of walls that have been enlarged in providing flow and feed paths for the molten metal as it fills the mold and cools is shown schematically in Fig. 1 . In pouring a flat plate, Fig. 1(a) , the metal enters...
Book Chapter

Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0009016
EISBN: 978-1-62708-187-0
... to one of riser placement so that each of the late- solidifying sections has its feed requirements met. Therefore, the methods must divide a casting into sections requiring risers by determining the feeding paths by which solidification will move directionally from early- to late- solidifying sections...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005611
EISBN: 978-1-62708-174-0
... Abstract This article focuses on the use of electron beam (EB) for near-net shape processing based on the wire feed material-delivery method. EB deposition processes start with a 3-D model designed in a computer-aided design (CAD) environment, where the deposition path and process parameters...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0009015
EISBN: 978-1-62708-187-0
... to the other ( Fig. 3a , 3b ), thus avoiding situations where two heavy sections are separated by a thin section. This is a poor design because metal must feed one heavy section through the thin section; when the thin section freezes before the heavy section, the flow path will be cut off and shrinkage may...
Image
Published: 01 January 1989
by the drawer-like movement of a feeding slide. (b) Parts to be ground move in an arcuate path while being transported in the nests of a rotating feed wheel. (c) Parts to be machined move diagonally while advancing along a rail. More
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006496
EISBN: 978-1-62708-207-5
... States. The riser must be able to deliver liquid until the casting has completely solidified, and there must be an unbroken feed path, or paths, through which liquid metal can travel to the entire casting. Feed paths can be thick sections (ribs), tapered sections, and runners. The freezing time...
Image
Published: 01 January 1989
Fig. 14 Planetary action and cutter path of an eccentric-drum miller. (a) Internal work. (b) External work. Cutter is shown in neutral position for loading (left), in radial feed to depth (center), and in planetary feed around work (right). More
Image
Published: 01 January 2006
Fig. 21 Circular and elliptical paths of the motion arm on an epicyclic straightener. (a) Displacement circular. (b) Displacement elliptical. Ratio x : y =2:1. (c) Feed to central axis circular. (d) Feed to central axis elliptical. Ratio x : y =2:1 More
Book Chapter

By Yoram Koren
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002174
EISBN: 978-1-62708-188-7
... + z 2 The distances x , y , and z are the components of L in the X , Y , and Z directions, respectively, and V is the required velocity along the path (referred to as feed rate in machining). Equations 1 , 2 , and 3 provide the basis of linear interpolator algorithms...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006326
EISBN: 978-1-62708-179-5
... ). With these alloys, the designer must pay more attention to feeding paths and allow space for location of feeders on the heavy sections of the castings ( Ref 22 ). Figure 4 shows an example of how the section size can be modified to allow feeding from a heavy section to a thin-walled section. The tapered...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005222
EISBN: 978-1-62708-187-0
... by the shrinkage behavior of the alloy. A large amount of shrinkage associated with eutectic formation at the end of solidification makes interdendritic feeding more difficult, especially when the fraction of the eutectic liquid is small. However, as the fraction of eutectic liquid increases, the feeding path...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0009024
EISBN: 978-1-62708-187-0
.... Fig. 3 Mold restraint to normal contraction creates areas of stress concentration in casting (a). Designs that permit unhindered contraction (b) are relatively free from residual stresses. When fillets are required in an area where the junctions can serve as flow and feed paths for the molten...
Series: ASM Handbook
Volume: 24
Publisher: ASM International
Published: 15 June 2020
DOI: 10.31399/asm.hb.v24.a0006580
EISBN: 978-1-62708-290-7
... extrusion uses a ram extrusion mechanism to feed a plastic filament from a spool into a print head. There it is heated and softened, then pushed through a die and onto a build platform. The fundamental process is controlled by managing the phase changes and associated properties of the materials...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005632
EISBN: 978-1-62708-174-0
.... The CNC motion or robotic motion and control are typical to the complex deposition paths required. Typically, the powder is delivered to the molten pool by inert gas through multiple jets within the laser head. Near-net shape cladding using wire feed is less suitable for laser net shape deposition because...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001470
EISBN: 978-1-62708-173-3
... the process control parameters, or planning the robot path. The plan is then sent to the real-time control system through the interface. The real-time controller, using this down-loaded plan, controls the operation of the equipment. During execution, several sensors monitor the process and feed back...