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Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004190
EISBN: 978-1-62708-184-9
... chlorine-free and nonchlorine bleaching stages, selection of material for bleaching equipment, developments in oxygen bleaching, and the use of highly corrosion-resistant materials for bleach plant equipment. The article reviews the materials used in the construction of paper machine components...
Abstract
This article discusses the methods of pulp production, pulp processing, pulp bleaching, and paper manufacturing. It describes various types of digesters, their construction materials, the corrosion problems encountered, and methods to protect these digesters from corrosion. The article examines the corrosion problems in high-yield mechanical pulping, sulfite process, neutral sulfite semichemical pulping, chemical recovery, tall oil plants, wastewater treatment, and recovery boilers. It explains the stages of chlorine-based and nonchlorine bleaching, process water reuse for elemental chlorine-free and nonchlorine bleaching stages, selection of material for bleaching equipment, developments in oxygen bleaching, and the use of highly corrosion-resistant materials for bleach plant equipment. The article reviews the materials used in the construction of paper machine components and specific corrosion problems that affect them. It discusses the composition and corrosive nature of white water. The article also addresses the corrosion and chemical recovery associated with kraft pulping liquors.
Book Chapter
Thermal Spray Applications in the Paper Production Industry
Available to PurchaseBook: Thermal Spray Technology
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005743
EISBN: 978-1-62708-171-9
..., suction roll, center press rolls, yankee dryer rolls, calendar rolls, doctor/scalping blades, and cutting equipment. paper machine components paper manufacturing plasma spraying pulping thermal spray coating tungsten carbide PAPER IS AN INTEGRAL PART of our daily lives, with applications...
Abstract
Thermal spray coatings, along with certain proprietary sealants, are widely used in the paper manufacturing industry for corrosion and wear resistance and to impart special surface characteristics. This article discusses the steps involved in the paper manufacturing process. Most modern papermaking machines are based on variations of the Fourdrinier machine. The article describes four operational sections of the machine: forming, press, drying, and calendar. It provides an overview of the machine components where thermal spray coatings are used, namely, digesters, blow tanks, suction roll, center press rolls, yankee dryer rolls, calendar rolls, doctor/scalping blades, and cutting equipment.
Book Chapter
Powder Metallurgy Stainless Steels Applications
Available to PurchaseBook: Powder Metallurgy
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006098
EISBN: 978-1-62708-175-7
... in which the component is to be used. The choice among the various grades of stainless steels may be based on the degree of corrosion resistance required over the service life of the component as well as on the physical and mechanical properties required in the application. In some cases, stainless steels...
Abstract
This article describes the physical properties of powder metallurgy (PM) stainless steels. These include thermal diffusivity, conductivity, thermal expansion coefficient, Poisson's ratio, and elastic modulus. The article contains a table that lists the characteristics of various grades of PM stainless steels. It discusses the applications of various PM stainless steels such as rearview mirror brackets, anti-lock brake system sensor rings, and automotive exhaust flanges and sensor bosses.
Book Chapter
Finishing Methods Using Multipoint or Random Cutting Edges
Available to PurchaseBook: Surface Engineering
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001232
EISBN: 978-1-62708-170-2
... becomes more amenable to control. As an example, in a centerless grinding process for a bearing component, the operation consisted of rough, semifinish, and finishing steps involving three operations, three machines, a large in-process inventory, and inspection between each operation. By consistent...
Abstract
Abrasive finishing is a method where a large number of multipoint or random cutting edges are coupled with abrasive grains as a bond or matrix material for effective removal of material at smaller chip sizes. This article provides a broad overview of the various categories of abrasive products and materials, abrasive finishing processes, and the mechanisms of delivering the abrasives to the grinding or machining zone. Abrasive finishing processes, such as grinding, honing, superfinishing, microgrinding, polishing, buffing, and lapping, are discussed. The article presents a brief discussion on abrasive jet machining and ultrasonic machining. It concludes with a discussion on the four categories of factors that affect the abrasive finishing or machining: machine tool, work material, wheel selection, and operational.
Book Chapter
Design and Manufacturing Implications of Additive Manufacturing
Available to PurchaseSeries: ASM Handbook
Volume: 24
Publisher: ASM International
Published: 15 June 2020
DOI: 10.31399/asm.hb.v24.a0006560
EISBN: 978-1-62708-290-7
... opportunities. Complex or unique custom geometries can be fabricated readily. Complex material compositions are also possible that can lead to optimized mechanical property distributions. Additionally, functional devices with kinematic joints and embedded components can be fabricated in the AM machine, enabling...
Abstract
This article introduces the design and manufacturing implications of additive manufacturing (AM) on part characteristics as well as on design opportunities and on manufacturing practices, supply chains, and even business models. In addition, it describes how they relate to the fundamental nature of AM processes and discusses the characteristics and purposes of AM processes and the parts they fabricate.
Book Chapter
Structural Applications for Advanced Ceramics
Available to PurchaseSeries: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003061
EISBN: 978-1-62708-200-6
... Abstract Structural applications for advanced ceramics include mineral processing equipment, machine tools, wear components, heat exchangers, automotive products, aerospace components, and medical products. This article begins with an overview of the wear-resistant applications...
Abstract
Structural applications for advanced ceramics include mineral processing equipment, machine tools, wear components, heat exchangers, automotive products, aerospace components, and medical products. This article begins with an overview of the wear-resistant applications and the parameters affecting wear of ceramics, namely, hardness, thermal conductivity, fracture toughness, and corrosion resistance. The next part of the article addresses temperature-resistant applications of advanced ceramics. Specific applications of ceramic materials addressed include cutting tools, pump and valve components, rolling elements and bearings, paper and wire manufacturing, biomedical implants, heat exchangers, adiabatic diesel engines, advanced gas turbines, and aerospace applications.
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005269
EISBN: 978-1-62708-187-0
.... , “Squeeze Casting of Aluminum Alloy Safety Critical Components for Automotive Applications,” Paper 33, 67th World Foundry Congress , June 5–7, 2006 ( Harrogate, U.K. ) 5. Burton P. , Brown Z. , and DasGupta R. , “Microstructure and Mechanical Properties of Squeeze Cast Magnesium...
Abstract
This article discusses the types of squeeze-casting machines and the advantages of squeeze casting. It examines the considerations required for the casting and tooling design process of squeeze-casting. The article describes the various factors that affect the squeeze-cast products and outlines a few of the key process characteristics. It provides information on the applications of squeeze-cast and contains a table that compares the tensile, hardness, and impact properties of select squeeze-cast aluminum alloys with those obtained from conventional casting processes.
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005267
EISBN: 978-1-62708-187-0
... chamber die casting recycling melting gate and runner design temperature control robotics fluxing injection components DIE CASTING ALLOYS that do not attack die casting machine components used for injection or delivery of metal to the die during long periods of immersion can be hot chamber die...
Abstract
This article describes the melting process of casting metals used in hot chamber die casting. It discusses the design and capabilities of injection components, such as gooseneck, plunger, and cylinder. The article reviews the distinctions between hot and cold chamber processes. An example of a typical runner, gate and overflow configuration for faucet fixture casting is shown. Temperature control for die casting is also discussed. The article explains some ejection and post-processing techniques used for the hot chamber die casting: robotics, recycling, and fluxing.
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002151
EISBN: 978-1-62708-188-7
...), and vertical-platen type (c) (with hydraulic feed table) coated abrasive precision grinding machines Fig. 18 Schematics illustrating the primary components of several types of coated abrasive precision grinding operations. (a) Sheet dimensioning. (b) Conveyor grinding. (c) Vertical-platen sanding. (d...
Abstract
Metal is removed from the workpiece by the mechanical action of irregularly shaped abrasive grains in all grinding operations. This article discusses three primary components of grinding wheels, namely, abrasive (the cutting tool), bond (the tool holder), and porosity or air for chip clearance and/or the introduction of coolant. It describes the compositions and applications of coated abrasives and types of grinding fluids, such as petroleum-base and mineral-base cutting oils, water-soluble oils, synthetic fluids, semisynthetic fluids, and water plus additives. The article concludes with information on different types of grinding processes, namely, rough grinding, precision grinding, surface grinding, cylindrical grinding, centerless grinding, internal grinding, and tool grinding.
Book Chapter
Rapid Prototyping
Available to PurchaseBook: Composites
Series: ASM Handbook Archive
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003397
EISBN: 978-1-62708-195-5
... structures during the building process. LOM was first commercialized by Helisys Inc., which used the approach described previously to cut and bond adhesive-backed paper that was delivered on a continuous roll. Another laminating machine, which uses single sheets of paper for each layer, photocopying...
Abstract
This article reviews various rapid prototyping (RP) processes such as stereolithography, powder sintering, hot melt extrusion, sheet lamination, solid ground curing, and three-dimensional printing. It discusses the various material prototypes produced by RP technology. The list of materials includes particulate and fiber-reinforced polymers, ceramic-matrix composites, and metal-matrix composites. The article also provides information on freeform-fabrication techniques for composite part lay-up.
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003526
EISBN: 978-1-62708-180-1
... are provided in the preceding article “Modeling and Accident Reconstruction” in this Volume. Example 1: Cracking in a Yankee Dryer Shell <xref rid="a0003526-ref11" ref-type="bibr">(Ref 11)</xref> A Yankee dryer is a critical mechanical component in the manufacture of tissue paper. It is a large...
Abstract
This article provides information on the development of finite element analysis (FEA) and describes the general-purpose applications of FEA software programs in structural and thermal, static and transient, and linear and nonlinear analyses. It discusses special-purpose finite element applications in piping and pressure vessel analysis, impact analysis, and microelectronics. The article describes the steps involved in the design process using the FEA. It concludes with two case histories that involve the use of FEA in failure analysis.
Book: Thermal Spray Technology
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005744
EISBN: 978-1-62708-171-9
... spray community serves the printing industry with a variety of protective coatings applied on behalf of original equipment makers and end users. High-speed printers require closer machine tolerances and coatings that promote longer component life. These coatings, applied to paper-contact surfaces...
Abstract
The thermal spray community serves the printing industry with a variety of protective coatings applied on behalf of original equipment makers and end users. This article describes the applications of thermal spray coating for printing equipment such as engraver rolls, plate and blanket cylinders, corona rolls, and draw rolls.
Book Chapter
Process Monitoring and Control of Rotary Friction Welding
Available to PurchaseSeries: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005578
EISBN: 978-1-62708-174-0
... between the two components, including radial, orbital, angular reciprocating, linear reciprocating, or rotary. Two important variations of friction welding are friction surfacing and friction stir welding. These processes are sufficiently different from other traditional friction welding variants...
Abstract
This article lists the system parameters of the friction welding process and describes the four categories of monitoring and control of the manufacturing process. It discusses the monitoring methods of a rotary friction welded sample, for determining in-process quality of ferrous alloys, and dissimilar metals using acoustic emission. The article reviews the feasibility of detecting the presence of ferrite during microstructural evolution of friction welding of three austenitic stainless steels: 310, 304, and 255. It also explains the in-process quality control of friction welding.
Book Chapter
Surface Finish and Surface Integrity
Available to PurchaseBook: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002119
EISBN: 978-1-62708-188-7
... from the inherent action of the production process, such as feed marks produced during machining Waviness is a more widely spaced component of surface texture and may result from such factors as machine or work deflections, vibration, or chatter Lay is the direction of the predominant surface...
Abstract
This article distinguishes between a surface finish and a surface texture. It provides information on the surface integrity technology that describes and controls the many possible alterations produced in a surface layer during manufacture, including their effects on material properties and the performance of the surface in service. The types of surface alterations associated with metal removal practices are described. The article discusses the surface roughness, surface integrity, and produced in manufacturing processes, and mechanical property effects. Surface alterations associated with metal removal practices of traditional and nontraditional machining operations, as well as their effect on the static mechanical properties of materials, are reviewed. Finally, the article provides guidelines for material removal, postprocessing, and inspection.
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002449
EISBN: 978-1-62708-194-8
... on the shapes that can be produced using NC. The term auto fab seems to include any automated process, but would not include processes with significant manual components. Desktop manufacturing is usually used when referencing small, desktop numerically controlled devices that automate standard machining...
Abstract
Rapid prototyping (RP) is a field in manufacturing involving techniques/devices that produce prototype parts directly from computer-aided design models in a fraction of time. This article discusses the principles of RP and three major commercial processes, based on their layer creation method. These include selective cure layered processes, extrusion/droplet deposition processes, and sheet form fabricators. The article provides information on the three classes of RP, namely, voxel sequential volume addition, periphery cutting, and area sequential volume addition. It presents equations that represent build times for each of the three classes.
Book Chapter
Structural Ceramics
Available to PurchaseSeries: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001107
EISBN: 978-1-62708-162-7
..., toughness Capstans and draw blocks, pulleys and sheaves, guides, rolls, dies Pulp and paper High-speed paper manufacturing Abrasion and corrosion resistance Slitting and sizing knives, stock-preparation equipment Machine tool and process tooling Machine components and process tooling Hardness...
Abstract
This article discusses the properties and uses of structural ceramics and the basic processing steps by which they are made. It describes raw material preparation, forming and fabrication, thermal processing, and finishing. It provides information on the composition, microstructure, and properties of aluminum oxides, aluminum titanate, silicon carbide, boron carbide, zirconia, silicon nitride, silicon-aluminum-oxynitride, and several ceramic composites. It also explains how these materials maintain their mechanical strength and dimensional tolerances at high temperatures and how some of their shortcomings are being addressed.
Book Chapter
Secondary Operations for Powder Metallurgy Stainless Steels
Available to PurchaseBook: Powder Metallurgy
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006119
EISBN: 978-1-62708-175-7
... of compaction, inevitably require machining. A good place to start for machining guidelines for PM stainless steels are those developed over the years for wrought stainless steel components of comparable chemistry and structure ( Ref 14 ). This article focuses on the influence the sintering atmosphere has...
Abstract
Powder metallurgy (PM) stainless steels, as with conventional PM steels, are often used in the as-sintered condition. In addition to cost considerations, minimization of postsinter handling and secondary operations is also preferred because it reduces the potential for contamination of the parts with particulates and residues, which can result in the appearance of surface rust. This article provides information on various secondary operations, including tumbling, re-pressing, resin impregnation, annealing or heat treating, brazing, machining, and welding. It describes those aspects relating to welding of PM stainless steels, specifically, the effects of density, residual porosity, and sintered chemistry on weldability. Further, the article investigates the influence the sintering atmosphere has on machinability, as well as differences created by the presence of residual porosity.
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006773
EISBN: 978-1-62708-295-2
... component in the manufacture of tissue paper. It is a large, cylindrical, rotating, pressurized, high-temperature, cast iron pressure vessel that has evolved in design since the early 1900s. A wet sheet of paper is placed on the rotating face of the dryer, which is located toward the back end of a crepe...
Abstract
When complex designs, transient loadings, and nonlinear material behavior must be evaluated, computer-based techniques are used. This is where the finite-element analysis (FEA) is most applicable and provides considerable assistance in design analysis as well as failure analysis. This article provides a general view on the applicability of finite-element modeling in conducting analyses of failed components. It highlights the uses of finite-element modeling in the area of failure analysis and design, with emphasis on structural analysis. The discussion covers the general development and both general- and special-purpose applications of FEA. The special-purpose applications of FEA covered are piping and pressure vessel analysis, impact analysis, and microelectronic and microelectromechanical systems analysis. The article provides case histories that involved the use of FEA in failure analysis.
Book: Surface Engineering
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001238
EISBN: 978-1-62708-170-2
..., but in most cases it is the last operation that governs the residual stress profile imparted to the component prior to its use or service. Exceptions occur when the final machining operation has a penetration depth smaller than the previous ones ( Ref 3 ). In such situations, the superimposition of residual...
Abstract
The concept of surface integrity for grinding operations can be extended to encompass six different groups of key factors: visual, dimensional, residual stress, tribological, metallurgical, and others. This article discusses the importance of these factors in the performance and behavior of finishing methods in various manufactured parts. Special emphasis is given to residual stresses and their influence on the final mechanical properties of a manufactured part.
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005255
EISBN: 978-1-62708-187-0
... patterns are injected complete, including their casting gates. However, very large or complex parts can be injected in segments, which are assembled into final form. The capacity of injection machines and the cost of tooling are important considerations. Gating components, including pour cups, are produced...
Abstract
This article reviews the pattern materials used in investment casting, which can be loosely grouped into waxes and plastics. The patternmaking process, pattern tooling, and pattern and cluster assembly are described. The article also describes the manufacture of ceramic shell molds and cores, detailing the binders and other materials used, as well as the formulation and control of slurries. Methods for pattern removal, mold firing, melting, casting, postcasting treatment, and inspection are explained. After presenting design recommendations for investment castings, the article concludes with information on applications and special versions of the investment casting process.
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