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hot sprues

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Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005275
EISBN: 978-1-62708-187-0
... Abstract Thixomolding is a method of molding thixotropic semisolid magnesium alloy pellets in a machine that resembles an injection molding machine in physical appearance and operation. This article describes the process of thixomolding. The use of hot sprues and hot runners in the thixomolding...
Image
Published: 01 November 2010
Fig. 30 Close-up views of hot tearing (cracks) in the bottom rods near the sprue. (a) Mg-2Al. (b) Mg-4Al. (c) Mg-8Al More
Image
Published: 01 November 2010
Fig. 31 Hot tearing indicator in the bottom rods near the sprue developed in simulation. (a) Mg-2Al. (b) Mg-4Al. (c) Mg-8Al More
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005221
EISBN: 978-1-62708-187-0
... filling system through various partial solutions to the prepriming approach. It discusses the six individual parts of the naturally pressurized filling system, namely, offset stepped pouring basin, sprue, sprue/runner junction, runner, gates, and feeding via feeders. The article also lists the key...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006303
EISBN: 978-1-62708-179-5
... to escape from impermeable molds such as densely packed green sand molds or metal molds. If no vent is provided, air trapped in the cavity can expand explosively on the arrival of hot metal, causing the metal to erupt back up the sprue. This spectacular action is not recommended. Vents are also required...
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
..., and overflow configuration for a faucet fixture casting is shown in Fig. 5 . This casting is both highly decorative and functional; the use of overflows allows hot metal to fill areas critical to appearance. Casting metal enters the sprue, where it is distributed to one or more runner systems that feed...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005265
EISBN: 978-1-62708-187-0
... tools, sports, medical, military, and aerospace. The general principle of the process involves placing a gas-permeable mold in an isolating chamber such that the sprue (inlet runner) extends downward from the bottom of the chamber. For investment casting, the molds are a common tree design...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005303
EISBN: 978-1-62708-187-0
..., and the rotary movement helps to heat and melt the furnace charge. Melting is accomplished both by the action of the flame directly on the metal and by heat transfer from the hot lining as this shell rotates. These furnaces usually tilt so that they can be charged and poured from the flue opening. At the present...
Book Chapter

Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0009017
EISBN: 978-1-62708-187-0
..., where the metal can then solidify to form the desired casting shape. The basic components of a simple gating system for a horizontally parted mold are shown in Fig. 1 . A pouring cup or a pouring basin provides an opening for the introduction of metal from a pouring device. A sprue carries the liquid...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005277
EISBN: 978-1-62708-187-0
... precipitation, shrinkage cavities, and hot tears, and after being frozen into the casting become effective cracks, lowering the strength and fatigue resistance. The folded films may also create leak paths, causing leakage failures. Thus, the entrainment of the liquid surface by surface turbulence leads...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005295
EISBN: 978-1-62708-187-0
... to deteriorate faster over time than smooth-wall molds. Hot top castings that create the head in ingot casting are usually made of gray iron. Modified graphite irons have had some success in this application as well. Sprue plates are bottom plates that contain the runners in bottom pouring that feed steel...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003171
EISBN: 978-1-62708-199-3
... shrinkage. This article describes the imperfections in the solidification process including porosity, inclusions, oxide films, secondary phases, hot tears, and metal penetration. It talks about the purpose of the gating system and the risering system in the casting process. alloys casting gating...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005252
EISBN: 978-1-62708-187-0
... or core and describes the problems most frequently encountered in shell-mold casting. The problems include mold cracking, soft molds, low hot tensile strength of molds, peelback, and mold shift. The article concludes with information on examples that provide some relative cost comparisons between shell...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005257
EISBN: 978-1-62708-187-0
... will increase. Increasing the number of ingates surrounding the sprue at the same level probably leads to the development of a hot spot, heat storage around the spot, and departure from conditions required for layerwise solidification. It is therefore best to assemble the patterns in a helical array...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006513
EISBN: 978-1-62708-207-5
...-mold alloys also must be more resistant to hot cracking. Silicon improves both characteristics. Alloys most readily cast in permanent mold contain 5% or more Si. The most popular permanent-mold alloys display superior castability, such as those of the Al-Si, Al-Si-Mg, and Al-Si-Cu (Mg) families ( Table...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003014
EISBN: 978-1-62708-200-6
... are equipped with a hot runner manifold ( Fig. 4 ), which keeps the material in the sprue and runners molten to become a part of the next shot. Fig. 4 Hot runner injection mold. Source: Ref 2 With larger and more complex parts, it is common to use more than one gate for injecting material...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006141
EISBN: 978-1-62708-175-7
...) metals or alloys. Recently, with the demand on improving the performance of materials, subjecting the consolidated MIM parts to an additional step of containerless hot isostatic pressing (HIP) is being employed in some instances. Fig. 2 Flowchart for MIM component manufacturing Part Selection...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005254
EISBN: 978-1-62708-187-0
... is vibrated to allow the loose sand to flow and compact in and around all areas of the pattern. A pouring basin or sprue cup is usually positioned around the exposed foam downsprue. When compaction (sand densification) is complete, the flask is moved into the pouring area, and molten metal is poured...
Book Chapter

Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005307
EISBN: 978-1-62708-187-0
... considerations include the usage of furnaces and launder system, scrap return, inclusions in zinc alloys, fluxing of zinc alloys, and galvanizing fluxes. The article discusses the materials and lubricant selection, casting and die temperature control, and trimming process used in hot chamber die casting for zinc...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005338
EISBN: 978-1-62708-187-0
... defects centrifugal casting chemical properties hot isostatic pressing induction skull melting investment casting machining mechanical properties postweld heat treatment static casting vacuum arc skull melting vacuum induction melting foundry melting rammed graphite casting weld repair...