« previous next »

Author Question: Calculate the size of the press required to mold a part using a multicavity transfer mold in which ... (Read 59 times)

sammy

  • Hero Member
  • *****
  • Posts: 818
on: Aug 19, 2018
Calculate the size of the press required to mold a part using a multicavity transfer mold in which the part size is 2.5 inches by 2 inches. The mold contains four cavities. There are four runners, each of which has a diameter of 0.375 inches and a length of 1.5 inches. The sprue has a projected area of 0.25 square inches. Assume that a transfer pressure 8,000 psi is needed.
 
  What will be an ideal response?

Question 2

Explain how foam-in-place and RIM differ.
 
  What will be an ideal response?


stillxalice

  • Sr. Member
  • ****
  • Posts: 339
Reply #1 on: Aug 19, 2018
Answer to Question 1

2.5 X 2 X 4 = 20 in2 for the total projected surface area of the parts. 4 X .375 X
1.5 = 2.25 in2 for the projected surface area of the runners. 20 + 2.25 + .25 =
22.5 in2 for the total projected surface area. 8,000 psi X 22.5 in2 = 180,000 pounds of pressure. 180,000 pounds / 2000 pounds = 90 tons of pressure.

Answer to Question 2

In both foam-in-place and RIM the material is squirted into a closed mold until the mold is filled. The foaming usually occurs at the same time as the filling. The major difference is that in RIM the foamed part is removed after it has solidified and the mold is reused. In foam-in-place, the mold is the sides of the part that is to contain the foam and so the foam is not removed.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

sammy

  • Hero Member
  • *****
  • Posts: 818
Reply #2 on: Aug 19, 2018
TY


stillxalice

  • Sr. Member
  • ****
  • Posts: 339
Reply #3 on: Aug 19, 2018
You're welcome


« previous next »
 

Did you know?

Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.

Did you know?

Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.

Did you know?

As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.

Did you know?

People often find it difficult to accept the idea that bacteria can be beneficial and improve health. Lactic acid bacteria are good, and when eaten, these bacteria improve health and increase longevity. These bacteria included in foods such as yogurt.

Did you know?

IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.

Experiment of Lederberg and Tatum demonstrating gene transfer in E. coli. Experiment of Lederberg and Tatum demonstrating gene transfer in E. coli.
Relationship between winter rainfall and chuckwalla, Sauromalus, size Relationship between winter rainfall and chuckwalla, Sauromalus, size
Relationship between winter rainfall and chuckwalla, Sauromalus, size Relationship between winter rainfall and chuckwalla, Sauromalus, size
Transferring Sterile Objects Using Transfer Forceps Transferring Sterile Objects Using Transfer Forceps
part b part b
Inadequate Airway, Breathing and Circulation in the Trauma Patient (Part 1) Inadequate Airway, Breathing and Circulation in the Trauma Patient (Part 1)
Video: Bulk flow - factors that influence bulk flow

For a complete list of videos, visit our video library