14 Questions
In centrifugal casting, how is the molten metal distributed to part cavities?
By centrifugal force
What type of symmetry is not required in centrifuge casting for smaller parts?
Radial symmetry
What is the recommended range for the draft angle in casting design?
1°-3°
What is an important consideration in casting design regarding section thickness?
Thickness as uniform as possible
What is the first step in the investment casting process?
Producing wax patterns
How is the full mold formed in investment casting?
By melting the wax to drip out of the cavity
What is a key difference between investment-cast and conventionally cast rotors?
Microstructure of two rotors
After the investment casting process, how are parts separated from the sprue?
By breaking away the mold from the finished casting
What is a key advantage of Investment Casting mentioned in the text?
Allows for casting parts of great complexity
Which characteristic is NOT an advantage of Plaster Mold Casting compared to sand casting?
It involves a quick mold-making process
What distinguishes Ceramic-Mold Casting from Plaster Mold Casting?
The capability to cast high-temperature alloys
What is a unique feature of Permanent Mold Casting as compared to expendable mold casting?
Uses a metal mold that is reusable
Which of the following is NOT considered a Permanent Mold Casting process?
Investment casting
Why is wax recovery for reuse an advantage in Investment Casting?
To reduce material waste and costs
Study Notes
Centrifugal Casting
- In centrifugal casting, molten metal is distributed to part cavities by centrifugal force.
Casting Design
- Axial symmetry is not required in centrifuge casting for smaller parts.
- Recommended range for draft angle in casting design is 0.5-2 degrees.
Investment Casting
- First step in investment casting process is to create a wax pattern.
- Full mold is formed in investment casting by surrounding the wax pattern with a refractory material.
- Key difference between investment-cast and conventionally cast rotors is the absence of porosity in investment-cast rotors.
- After investment casting process, parts are separated from the sprue by breaking or cutting the sprue.
- Key advantage of investment casting is the production of complex geometries with high accuracy and precision.
- Wax recovery for reuse is an advantage in investment casting.
Plaster Mold Casting and Ceramic-Mold Casting
- Plaster Mold Casting does not have a high strength-to-weight ratio, which is a characteristic of other casting methods.
- Ceramic-Mold Casting is distinguished from Plaster Mold Casting by its use of a ceramic mold.
Permanent Mold Casting
- Unique feature of Permanent Mold Casting compared to expendable mold casting is its reusable mold.
- Slush casting is not a Permanent Mold Casting process.
Note: These study notes cover the key points and concepts from the provided text, focusing on the different casting methods and their characteristics.
Explore the differences between Investment Casting and Plaster Mold Casting processes, including advantages and disadvantages of each. Learn about the manufacturing techniques used in casting complex parts with close dimensional control.
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