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through-feed rolling
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Book Chapter
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002142
EISBN: 978-1-62708-188-7
... Abstract This article discusses the three characteristics that are important in evaluating and selecting metals for thread rolling, namely, rollability, flaking, and seaming. It reviews the capabilities and limitations of flat-die rolling, radial-infeed rolling, tangential rolling, through-feed...
Abstract
This article discusses the three characteristics that are important in evaluating and selecting metals for thread rolling, namely, rollability, flaking, and seaming. It reviews the capabilities and limitations of flat-die rolling, radial-infeed rolling, tangential rolling, through-feed rolling, planetary thread rolling, continuous rolling, and internal thread rolling, as well as the rolling machines and dies used. The article describes the factors affecting die life and provides information on radial die load, seam formation, surface finish, and thread dimensions that are affected by the form of the thread. It explains the reasons for using fluids in thread rolling. The article concludes with a comparison of rolling with cutting and grinding.
Book Chapter
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004012
EISBN: 978-1-62708-185-6
..., through feed, planetary, and internal. This article focuses on the capabilities, limitations, and machines used for these methods. It describes the three characteristics, such as rollability, flaking, and seaming, used in evaluating and selecting metals for thread rolling. The article explores the factors...
Abstract
Thread rolling is a cold-forming process for producing threads or other helical or annular forms by rolling the impression of hardened steel dies into the surface of a cylindrical or conical blank. Methods that use cylindrical dies are classified as radial infeed, tangential feed, through feed, planetary, and internal. This article focuses on the capabilities, limitations, and machines used for these methods. It describes the three characteristics, such as rollability, flaking, and seaming, used in evaluating and selecting metals for thread rolling. The article explores the factors affecting die life and explains the effect of thread form on processing. It provides information on various fluids used in thread rolling to cool the dies and the work and to improve the finish on the rolled products. The article provides a comparison between thread rolling and cutting, as well as between thread rolling and grinding.
Book Chapter
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005126
EISBN: 978-1-62708-186-3
... Abstract Contour roll forming is a continuous process for forming metal from sheet, strip, or coiled stock into desired shapes of uniform cross section by feeding the stock through a series of roll stations equipped with contoured rolls. This article discusses the materials, roll-forming...
Abstract
Contour roll forming is a continuous process for forming metal from sheet, strip, or coiled stock into desired shapes of uniform cross section by feeding the stock through a series of roll stations equipped with contoured rolls. This article discusses the materials, roll-forming machines, tooling, and auxiliary equipment used in contour roll forming and its process variables. Tooling used in roll forming includes forming rolls and dies for punching and cutting off the material. The article discusses the additional tooling required in tube mills to weld, size, and straighten the tubes as they are produced on the machine. It describes the roll design for tube rolling and reviews the seam welding operations of pipe and tubing. The article discusses cross-sectional tolerances, the reshaping of round tubing, and factors that affect the quality, accuracy, and surface finish.
Book Chapter
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002138
EISBN: 978-1-62708-188-7
..., such as internal tool, external tool, and tools for the roller burnishing of tapered holes and circular flat surfaces. The article contains a table that lists typical inside and outside diameter speed and feed rates for roller burnishing tools. It exemplifies typical lubrication techniques and the conditions used...
Abstract
Roller burnishing is a method of working a metal surface to improve its finish and dimensional accuracy and can provide some degree of work hardening. This article discusses the workpiece requirements used for roller burnishing. It illustrates the types of roller burnishing tools, such as internal tool, external tool, and tools for the roller burnishing of tapered holes and circular flat surfaces. The article contains a table that lists typical inside and outside diameter speed and feed rates for roller burnishing tools. It exemplifies typical lubrication techniques and the conditions used in the roller burnishing of magnesium alloy castings. The article reviews fillet rolling that is used to improve fatigue resistance of the materials. It concludes with a discussion on the process considerations for three basic types of bearingizing tools for the finishing of bores: bottoming, semi-bottoming, and through-hole.
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005849
EISBN: 978-1-62708-167-2
... to the induction heating system, every induction heating system has a mechanism for feeding the billets through the induction heating coils. Induction billet heaters are classified based on the type of materials handling system they use. The main categories of billet feeding systems are: Dual pinch roll...
Abstract
The handling of billets or bars is an essential part of an induction heating system. This article describes two types of handling systems available for bar heating lines: inclined ramps with escapement, and sling feeder with inclined ramp and escapement. It focuses on the various infeed billet handling systems such as bin tippers, elevator feeders, rotary feeders, vibratory bowl feeders, magazine loaders, and rod feeders. The article provides information on the main categories of billet feeding systems, namely, dual pinch roll drive assemblies, tractor drive assemblies, billet pusher systems, walking beam assemblies, and index/continuous conveyor systems. It also discussed the hot billet handling systems used to deliver heated billets to the forging cell. These methods include billet extractor conveyors, accept/reject systems with pyrometer measurements, extractor rolls, discharge chutes, pinch roll extractors, pick-n-place systems, and robots.
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005138
EISBN: 978-1-62708-186-3
... through restricting guides against a coiling point and around a fixed arbor into a coil. At the end of the coiling cycle, the feed rolls stop, and a cutoff mechanism actuates a knife, which severs the completed spring against the arbor. A flying knife separates the completed spring from the wire strand...
Abstract
This article describes the operation procedures of wire rolling in a Turks Head machine. It discusses spring coiling, as well as the manual and power bending used in the wire forming process. The article contains a table that lists examples of several wire-forming production problems and solutions. Lubricants for wire forming such as inorganic fillers, soluble oils, and boundary lubricants are reviewed. The article also analyzes the applications of lubricants in wire forming.
Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003015
EISBN: 978-1-62708-200-6
... to stop the tendency of the melt to rotate as it goes through the die. A screen pack is generally used in conjunction with the breaker plate to remove any foreign particles, and in some cases, to create the proper pumping and mixing action in the feed screw. A head pressure gage is inserted...
Abstract
This article describes the extrusion process, which converts soft, plastic material into a particular form using an extruder, or screw conveyer. It discusses the two main types of plastic extruders, twin-screw and single-screw, estimation of extruder capacity, and design and operations (heating, cooling, downstream sizing, corrugating, and crossheading) of the screw, the most important component of any extruder. It discusses the shapes produced by screw extrusion and the types of extrusion products produced by extrusion processes, including blown-film extrusion, flat-film or sheet extrusion, chill-roll film extrusion, pipe or tube extrusion, wire and cable coverings, extrusion coating, and profile extrusion, and provides some discussion on multiple-screw extruders. The article describes the dimensional accuracy of extrusion products, and lists common defects that occur frequently in the extrusion process.
Book Chapter
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005115
EISBN: 978-1-62708-186-3
... Abstract This article commences with a description of the four basic types of feeding arrangements, namely, hand feeding, hitch feeds, roll feeds, and slide feeds. Air feeds offer the utility of use with a wide variety of presses and machines. The article discusses the mounting and actuation...
Abstract
This article commences with a description of the four basic types of feeding arrangements, namely, hand feeding, hitch feeds, roll feeds, and slide feeds. Air feeds offer the utility of use with a wide variety of presses and machines. The article discusses the mounting and actuation of the air feeds, which allows automatic feeding in machinery that is not normally adaptable to the use of standard feeds. Automatic press feeds are used to improve production and provide uniform, accurate progressions. The article describes the accuracy control techniques for the automatic press feeds and concludes with information on air circuits for the air feeds.
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005112
EISBN: 978-1-62708-186-3
... handling. The gap makes the die area accessible from either side, as well as from the front, for ease in die setting or for feeding stock. Coil stock often is supplied to gap-frame presses by feeders from stock reels and straighteners. Workpieces usually are ejected through an opening in the press bed...
Abstract
This article describes the various types of press construction and the factors that influence the selection of mechanically or hydraulically powered machines for producing parts from sheet metal. Presses are broadly classified, according to the type of frame used in their construction, into two main groups: gap-frame presses and straight-side presses. The article describes the various components of mechanical presses and hydraulic presses. It discusses important factors, such as the size, force, energy, and speed requirements, that influence the selection of a press. The article describes the roles of automatic handling equipment that can be categorized as feeding equipment, unloading equipment, and transfer equipment. It concludes with information on the common types of high-production presses, such as dieing machines, multiple-slide machines, transfer presses, fine blanking presses, and flexible-die forming presses.
Book Chapter
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005136
EISBN: 978-1-62708-186-3
... at opposite inclinations rotates and feeds the bar through the machine. Straightening is accomplished by flexing the workpiece into the throat of the concave roll by the modified straight-face roll ( Fig. 3d ). The bar is positioned vertically by means of a bottom guide or top and bottom guides (not shown...
Abstract
Bars, structural shapes, and long parts are straightened by bending, twisting, or stretching. This article describes the straightening of bars, shapes, and long parts by material displacement, heating, and presses. It explains the process of parallel-roll straightening, automatic press roll straightening, moving-insert straightening, parallel-rail straightening, and epicyclic straightening. The article concludes with a discussion on straightening in bar production.
Book Chapter
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005137
EISBN: 978-1-62708-186-3
... of the stock. The smaller the angle, the less through feed per revolution of the tube, and because of the small helix angle created by feed per revolution, a large portion of the tube is subject to maximum bending stress. Short bends and end hooks can be straightened in a two-roll machine, because all...
Abstract
Tubing of any cross-sectional shape can be straightened by using various equipment and techniques. This article provides a discussion on principal factors that influence the procedures and tooling of tube straightening. It describes the tooling and application of different types of tube straightening techniques, namely, press straightening, parallel-roll straightening, two-roll rotary straightening, multiple-roll rotary straightening, and ovalizing in rotary straighteners.
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003983
EISBN: 978-1-62708-185-6
..., and it is necessary to anneal the material fully. Metal Flow During Swaging Metal flow during rotary swaging is not confined to one direction. As shown in Fig. 3 , more metal moves out of the taper in a direction opposite to that of the feed than through the straight portion during each blow. The partitioning...
Abstract
Rotary swaging is an incremental metalworking process for reducing the cross-sectional area or otherwise changing the shape of bars, tubes, or wires by repeated radial blows with two or more dies. This article discusses the applicability of swaging and metal flow during swaging. It describes the types of rotary swaging machines, auxiliary tools, and swaging dies used for rotary swaging and the procedure for determining the side clearance in swaging dies. The article presents an overview of automated swaging machines and tube swaging, with and without a mandrel. It analyzes the effect of reduction, feed rate, die taper angle, surface contaminants, lubrication, and material response on swaging operation. The article discusses the applications for which swaging is the best method for producing a given shape, and compares swaging with alternative processes. It concludes with a discussion on special applications of swagging.
Book Chapter
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002131
EISBN: 978-1-62708-188-7
... for deep-hole trepanning. The article contains a table that lists speeds and feeds for the deep-hole trepanning of various steels with high-speed tool steels and carbide tools. carbide tools circular grooves high-speed tool steels large shallow through holes round disks trepanning...
Abstract
Trepanning is used in at least four distinct production applications: round disks, large shallow through holes, circular grooves, and deep holes. This article provides an overview of the first three applications. It describes the machines, tools, techniques, and cutting fluids used for deep-hole trepanning. The article contains a table that lists speeds and feeds for the deep-hole trepanning of various steels with high-speed tool steels and carbide tools.
Book Chapter
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005119
EISBN: 978-1-62708-186-3
..., and straighteners are required when coil stock is used. Several types and sizes are available (see the article “Presses and Auxiliary Equipment for Forming of Sheet Metal” in this Volume). Feed Mechanisms In progressive-die operations, the common types of feed mechanisms, for example, single-roll or double...