×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

This equation from the Injection molding handboook(Rosato)

This equation from the Injection molding handboook(Rosato)

This equation from the Injection molding handboook(Rosato)

(OP)
I came across this equation in the "Injection Molding Handbook (written by Dominic and Donald Rosato)" and its really important I find out what it means. It is located on pg.196 of the 1986 edition of the book the equation is:


S= (-t^2/2pi*a)*ln(pi(Tx -Tm)/4(Tc -Tm))
where: S= minimum cooling time (sec)
       t= thickness of molding (in. or cm)
       a= thermal diffusivity of material (inc^2/sec)
      Tx= ejection temperature of molding(distortion temperature)
      Tm= mold temperature
      Tc= cylinder temperature


I am trying to find out if this equation means that this is the minimum time required for air cooling or is this for all possible cooling procedures. To elaborate, I want to know if this equation is to only for air cooling or is it the total cooling time possible (no matter how much what procedure is used including cooling channels etc...)

RE: This equation from the Injection molding handboook(Rosato)

Kes,

The equation is for the injection molding process if you want to calculate the minimum ESTIMATED cooling time for a given part.  From the equation, you can see it is asking for the thickness of the part you are molding, the material properties and for information about the process (mold temp).  This is not for air cooling, but rather cooling based on the injection process.  

Dave

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources