Lecture 3

Question 1

What is a follow board?

Answer 1

Special board with inset cavities to position the pattern at the correct depth for the parting line.

Question 2

In split patterns, the parting line is always XXX.

Answer 2

Flat

Question 3

Types of patterns and quantities.

Answer 3

1. Solid pattern (small quantities)
2. Split pattern (moderate quantities)
3. Match-plate pattern
4. Cope and drag patterns (large quantities) -> Multiple castings at once.

Question 4

Testing method: moisture, clay, compactibility, grain size, permeability, compressive strength, hardness.

Answer 4

Electrical conductivity/Weight-dry-weight, Wash-dry-weigh, height change, sieving, pressure loss, compressive testing, hardness testing.

Question 5

What are the methods of packing sand?

Answer 5

1. Hand ramming
2. Jolting
3. Squeezing (plate/diaphragm)

Question 6

Core types

Answer 6

1. Green sand cores
2. Dry sand cores
3. Single-piece cores
4. Core-oil process
5. Hot-box method (thermoset binder)
6. Cold-box process (binder set using gas/vaporized catalyst)
7. No-bake cores
8. Shell-molded cores

Question 7

What can be done to enhance core properties?

Answer 7

1. Internal wires/rods
2. Vent holes
3. Core prints
4. Chaplets