Casting and Machined Surface Finish Guide - Rev 00 1
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Transcript of Casting and Machined Surface Finish Guide - Rev 00 1
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7/21/2019 Casting and Machined Surface Finish Guide - Rev 00 1
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Casting and Machined Surface Finish Guide
This is the Example of PerfectStainlessSteelCasting Surface Finish that AlcoAutomation Pte Ltd will accept from thesuppliers.
The surface must be FREEof the
following problems:
1. Dents2. mperfections!. "asting lines#. $ne%enness&. Deep scratches'. (ould mar)s*. +ough surface,. (achine mar)s-. range /)in e0ect
The abo%e problems are
explained in the below pages.
And Alco will NOTaccept an
other form of unacceptable
surface nish tpes.
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Rough and Dirty
surface
Crack like line
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Orange Skineect
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Uneven surface
nish
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Uneven surface
nish
Mould Mark
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Dee!
Scratches
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Groove
surface
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Mould Mark
Mould Mark
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Marks on the
surface
Marks on the
surface
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+ough
surface
"rac) li)e
lines
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"#!erfection $
Groove surface
"#!erfection
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Dents and
!orosity #arks
Dee! dent
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1 INSPECTION STANDARD FOR EXTRUDED PARTS
Topic Description Preferred Accept Reject
Die Lines A longitudinal indentations or protrusions formedon the surface.
No Die Lines No more than 3 in a 25mm wide area higher ordeeper than 0.25 mm
Crack(ot !ear"
A crack occurs due to internal cooling stresses duringsolidification of low strength allo#s
No cracks A crack
$cratches%$pecs% nicks%gouges%
&arks in the e'trusion not designed to e there. No marks &arks not )isile afterfinishing process or has nodiscernale depth
Depth to mark isgreater than 0.25mm
$cuff marks A series of )er# light% concentrated scratches that cane seen ut not felt.
None None allowed on primar#sides% Allowale onsecondar# sides
$cuff marks on primar#side
2 INSPECTION STANDARD FOR MACHININ AND HAND!IN
Topic Description Preferred Accept Reject
*urred +dge &etal left around edge or drill hole% usuall# caused #machining or drilling
No urrs A urr that is dull orshorter than , mm
A urr that is sharp orlonger than , mm
Chipped&etal
$hown as nicks or it si-e metal remo)ed from thesurface due to tooling process. !#picall# chipped metalcan e found at edge or drill hole.
No chippedmetal
Chipped metal , mm indiameter on primar# side
/p to 3 chipped areas per25 cm2
(5 cm ' 5 cm" onsecondar# side
Chipped metal , mmin diameter on primar#side
&ore than 3 chippedareas per 25 cm2
(5 cm ' 5 cm" and ifcase metal is e'posed
Deformation A locali-ed mechanical induced defect that changes theshape of the metal. Classified under deformation aredents% nicks% gouges and scratches.
Nodeformation Does not affect form fit orfunction Affects form fit orfunction
1roo)ed$urface
1roo)es formed on the surface as a result of tool itcondition.
No surfacegroo)es
$lightl# groo)ed surface ea)il# groo)edsurface
idge A ridge remaining on the surface due to incompletelathing or remo)al of material
No ridges eight of ridge 0.25 mm ao)ereferenced surface
eight of ridge 0.25 mm ao)ereferenced surface
$harp orLoose &etal
$harp or loose metal can result during machining No sharp or loose metal $harp or loose metal
Deformed A deformation such that the ailit# to seal the unit will $mooth uniform mating $ealing of unit is
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sealing e compromised surfaces compromised
" INSPECTION STANDARD FOR CAST PRODUCTS
Topic Description Preferred Accept Reject
*lister Defect on the surface of a casting appearing as ashallow low with a thin film of metal o)er it
No lister A lister
*lowhole(*low"
Can appear as smoothwalled )oids or ca)ities% eitheron the surface or within a casting. *oth result fromgas or steam created during the casting process.
No lowhole A lowhole
Crack(ot !ear"
A crack occurs due to internal cooling stresses duringsolidification of low strength allo#s
No cracks A crack
4nclusions oreign material emedded in or on a casting.Common inclusions are o'ides% slag% and loose sand(t#pical for sandcasting".
No inclusions 4nclusions ,.5 mmdiameter
4nclusions ,.5 mmdiameter
&isruns (short
shots" andCold shots
A defect caused # improper filling of the ca)it# due to
cold metal% too thin a section or improper gating orpouring. A section of a casting which is not filled outis called a misrun or a short shot.!wo streams of metal not completel# fused is called acold shot.
No short shots
No cold shots
A short shots
A cold shot
6inhole6orosit#
7oids shown on the surface of the ase metal. !his isthe result of gas e)ol)ing through the metal.
No pin holes Diameter of a )oid is ,mm./p to 3 )oids per 25 cm2area (5cm ' 5cm"
Diameter of a )oid is ,mm.
&ore than 3 )oids per25 cm2area
(5 cm ' 5 cm"
Deformedsealing
A deformation such that the ailit# to seal the unit wille compromised
$mooth uniform matingsurfaces
$ealing of unit iscompromised