Important: Use custom search function to get better results from our thousands of pages

Use " " for compulsory search eg:"electronics seminar" , use -" " for filter something eg: "electronics seminar" -"/tag/" (used for exclude results from tag pages)


 
 
Thread Rating:
  • 0 Votes - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Casting Defects and Design Issues
Post: #1

Casting Defects and Design Issues



.pdf  castdefect.pdf (Size: 1.4 MB / Downloads: 278)

Porosity

Types
–due to gases – smooth bubbles
–due to shrinkage – rough voids
•Not a problem for ingots
–parts that will be deformation processed
–as long as it is not exposed to air (corrosion)
–can be healed


Porosity due to Gases


Smooth bubbles
–result from entrapped gases
–solubility in liquid is high, in solid is low, so gas is rejected during cooling
•Sievert’s law
S = kpg0.5
–S = solubility
–k = constant
–pg = partial pressure of gas over melt



Remedies for Gas Bubbles

•Control atmosphere
–vacuum
–gases with less solubility
•Proper venting to let gases out
•Proper design of runners and gates to avoid turbulence



Porosity due to Shrinkage

•Rough bubbles - voids
•Stages
–cooling liquid
–rejects latent heat at melting point
•alloys become slushy - liquid and solid co-exist
–cooling solid


Porosity / Shrinkage Solutions

•Risers allow molten metal to flow into mold to make up for shrinkage
•Design flow so no part freezes early
–large channels
•“Flexible” molds
–allow metal to shrink, not hold metal



Design Rules Summary

•Uniform wall thickness
•Flat parting lines
•Gradual thickness transitions
•Draft for removal
–tapers: 0.5 to 2 degrees
•Surface of mold gives surface of part
 

Marked Categories : defects in casting ppt, http seminarprojects com thread casting defects and design issues, casting defects projects, casting defect, seminar topics on casting defects, project topics related to casting defects, casting defects for seminar, porosity defects in casting seminar papers, project report casting defects, seminar on casting defects, seminar on casting defects pdf file, casting defects seminar topic, s kpg0 5, pdf seminar topic casting defects, project report on casting defects, letest problem of casting defects, casting defect seminar, casting defect project, casting defects seminars, casting defects seminar, project on casting defects, casting defects,

[-]
Quick Reply
Message
Type your reply to this message here.

Image Verification
Image Verification
(case insensitive)
Please enter the text within the image on the left in to the text box below. This process is used to prevent automated posts.

Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  bench vice design calculations Guest 2 0 23-05-2018 02:10 PM
Last Post: Guest
  pavement design 10cv833 pdf notes vtu Guest 0 0 17-05-2018 02:49 PM
Last Post: Guest
  design digital rpm indicator for electric motor with over speed alarm indicator Guest 0 0 15-04-2018 06:32 PM
Last Post: Guest
  JPEG Decoder Design Report seminar flower 1 662 25-03-2018 06:49 PM
Last Post: magnumZ
  green belt design ppt Guest 0 0 23-02-2018 08:24 PM
Last Post: Guest
  attending lectures on different geological techniques and geophysical techniques and subine 2 65 24-01-2018 12:34 AM
Last Post: RamiJer
  edmonton web design seo Guest 1 147 18-01-2018 02:41 PM
Last Post: dhanabhagya
  Metal Casting and Foundry seminar flower 2 2,878 12-01-2018 10:50 AM
Last Post: dhanabhagya
  edmonton web design seo Guest 1 211 06-01-2018 04:18 PM
Last Post: dhanabhagya
  is 2825 design calculation spreadsheet Guest 1 0 02-01-2018 12:06 PM
Last Post: dhanabhagya
This Page May Contain What is Casting Defects and Design Issues And Latest Information/News About Casting Defects and Design Issues,If Not ...Use Search to get more info about Casting Defects and Design Issues Or Ask Here

Options: