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gating system

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001522
EISBN: 978-1-62708-235-8
..., which indicated turbulent filling of the mold. Spherical pores would have indicated the melt had been improperly degassed. Based on these findings, it was recommended that the manufacturer analyze and redesign the gating system to eliminate the turbulent flow problem during the permanent mold casting...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001029
EISBN: 978-1-62708-214-3
.... It was concluded that the strength of the castings had been compromised by the presence of the casting defects. Modification of the gating system for casting was recommended to eliminate the hot tear zone. It was also suggested that the balance of the castings from the same manufacturing lot be radiographically...
Image
Published: 01 January 2002
Fig. 21 Example of an OR gate used to model a series system More
Image
Published: 01 January 2002
Fig. 23 Example of an AND gate used to model a parallel system More
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006936
EISBN: 978-1-62708-395-9
... the linear and phased array systems that are sometimes used for large-scale inspection tasks to reduce scan times, the various gating and image processing techniques, and how ultrasonic data are interpreted and presented. A brief section on future trends in ultrasonic inspection is presented at the end...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001199
EISBN: 978-1-62708-235-8
... on the design of the gate and runner system and operating conditions. High flow efficiencies, with adequate feeding to all sections of the die, and short cavity fill times are desirable. Casting defects Die castings Surface defects Zinc-aluminum alloy Casting-related failures 1. Introduction...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001071
EISBN: 978-1-62708-214-3
..., the valve and piping system are inspected for corrosion, and the flanges of the valve are unbolted to inspect, maintain, repair, and replace parts and components. Fig. 1 Schematic of 150mm (6in.) gate valve body. Circumstances Leading to Failure Prior to failure, the valve had been operated...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001653
EISBN: 978-1-62708-219-8
... Abstract After six years of service, three water shut-off valves on a copper water line in a residential building were found to be inoperative. Macroscopic examination of the valves after disassembly revealed that all three failed at the key that holds the spindle in the gate. In addition...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006831
EISBN: 978-1-62708-329-4
..., it is equally important to remember that the elevated temperature of the metal can also cause a reaction with air to oxidize the metal as it is being poured, thus reintroducing the possibility of oxides forming, despite the best efforts to remove the slag. The gating and risering systems employed to deliver...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003508
EISBN: 978-1-62708-180-1
... interfere with the ability of the foundry to use the best techniques to produce reliable castings. Defect-free castings can be produced at a price. The multitude of process variables, such as molding mediums, binder, gating and risering, melting and ladle practice, pouring technique, and heat treatment...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006935
EISBN: 978-1-62708-395-9
... at the nozzle of the machine or at the gates of a hot manifold system. The gas flows through the areas of lowest viscosity at the hotter center of the melt. Polymer injection is stopped before the part is full, which allows the gas to fill out the molten areas. Final filling of the part is by gas pressure...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003503
EISBN: 978-1-62708-180-1
... provisions in case the failure should occur. A structured approach to the FMEA ensures that all appropriate failure modes are analyzed, that the system satisfies its fault mitigation requirements, and that these requirements are properly allocated. The FMEA methodology can be usefully employed throughout...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006927
EISBN: 978-1-62708-395-9
..., a subset of the process consideration, is one that is not used too often, but for certain processes and part geometries it is crucial. For example, in injection molding, for a large part that might have long asymmetrical flow lengths, the design engineer will want to consider all possible gate locations...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001133
EISBN: 978-1-62708-214-3
... degree of bead-to-bead bonding compared with the bead-to-substrate bond. 158×. In an attempt to determine when the decarburization occurred, additional sections were made through the gate contact surfaces. Gate contacts are the locations at which the liquid alloy feeding system is attached...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006864
EISBN: 978-1-62708-395-9
... of type, is that they possess a constant torque characteristic. This means that to achieve maximum power, the extruder should be run as close to maximum speed as possible. The drive motor is coupled to the screw either via a direct mechanical coupling or an indirect belt/sheave system. While transmitting...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006916
EISBN: 978-1-62708-395-9
..., above degradation temperature, in an overpacked condition, and designed with uneven wall thickness, sharp corners, and a very small gate. Six Major Causes of Manufacturing-Related Failures of Plastic Parts In this section, we focus on the six major categories that can induce manufacturing-related...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0089734
EISBN: 978-1-62708-235-8
..., and pipe of ASTM A 106, grade B; similarly numbered ASME SA specifications also apply). A powdery, green deposit found in the interior of an iron-body gate valve of the system was determined by chemical analysis to consist of a trivalent chromium oxide or salt plus iron oxide or salt and 22% combined...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003514
EISBN: 978-1-62708-180-1
..., the response surface method, and Monte Carlo sampling. A brief introduction to importance sampling, time-variant reliability, system reliability, and risk analysis and target reliabilities is also provided. The article examines the various application problems for which probabilistic analysis is an essential...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001320
EISBN: 978-1-62708-215-0
... affected were waterwall tubes extending from the lower waterwall headers (at the gate level) approximately 1.2 m (4 ft) above the burner grates. The target wall and both side walls were affected. These sections experienced higher heat intensity due to proximity of fuel combustion products. A window sample...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003512
EISBN: 978-1-62708-180-1
... gate valves were in service with similar gate valve stems, a question was raised by the power plant whether this and other gate valve systems could be used or if a costly replacement effort was needed. The investigator showed that no crack extension had occurred from the forging defect. Thus...