This topic contains a solution. Click here to go to the answer

Author Question: Give three methods for controlling the exotherm in casting. Explain how they work. What will be ... (Read 53 times)

burton19126

  • Hero Member
  • *****
  • Posts: 532
Give three methods for controlling the exotherm in casting. Explain how they work.
 
  What will be an ideal response?

Question 2

What are some of the advantages of foamed polymers and parts? What advantages do foamed resins have for injection molding?
 
  What will be an ideal response?



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

taylorsonier

  • Sr. Member
  • ****
  • Posts: 377
Answer to Question 1

Three ways that an exotherm can be controlled during casting include air, water, and pressure. Higher pressure causes the foam to cure slower, so the higher the pressure that is within the cast, the more control you have. Also water and air help cool the exotherm to aid in creating a better part with less cracking capabilities. Cooling the exotherm also causes it to cure slower.

Answer to Question 2

Some advantages are cost benefits, cheaper molds and materials. They also have low thermal conductivity and can enhance the strength of a part when it is placed between two materials. A smaller shot size is used in injection molding, also requiring less plastics material to fill the mold. The chemical reaction that creates the foam requires less mechanical heat and pressure from the machine.




burton19126

  • Member
  • Posts: 532
Reply 2 on: Aug 19, 2018
Excellent


cam1229

  • Member
  • Posts: 329
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

 

Did you know?

Tobacco depletes the body of vitamins A, C, and E, which can result in any of the following: dry hair, dry skin, dry eyes, poor growth, night blindness, abscesses, insomnia, fatigue, reproductive system problems, sinusitis, pneumonia, frequent respiratory problems, skin disorders, weight loss, rickets, osteomalacia, nervousness, muscle spasms, leg cramps, extremity numbness, bone malformations, decayed teeth, difficulty in walking, irritability, restlessness, profuse sweating, increased uric acid (gout), joint damage, damaged red blood cells, destruction of nerves, infertility, miscarriage, and many types of cancer.

Did you know?

Oxytocin is recommended only for pregnancies that have a medical reason for inducing labor (such as eclampsia) and is not recommended for elective procedures or for making the birthing process more convenient.

Did you know?

Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.

Did you know?

Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.

Did you know?

Bisphosphonates were first developed in the nineteenth century. They were first investigated for use in disorders of bone metabolism in the 1960s. They are now used clinically for the treatment of osteoporosis, Paget's disease, bone metastasis, multiple myeloma, and other conditions that feature bone fragility.

For a complete list of videos, visit our video library