Quiz #4 ME 330.3 Manufacturing Process 2017/2018 T1

Time:20 minutes

Name: ______Student Id: ______

  1. Explain what is called 3D printing and its relationship with additive manufacturing technology. [20]

3D printing is a kind of additive manufacturing technology. The principle of 3D printing technology is such that a hot melt dropping on a cold substrate will solidify and glue to the substrate.

  1. List one pros and one cons of 3D printing in comparison with other additive manufacturing technology. [10]

Procs: simple principle and thus simply equipment.

Cons: poor mechanical property or more restricted set of materials.

  1. Explain what additive manufacturing technology can make metal parts and why. [10]

The power-based and sheet-based additive manufacturing technology can make metal parts. This is because metals can be made into power and sheet, in particular powder.

  1. Explain the underlying idea or principle for additive manufacturing technology and why this technology can make parts with complex internal geometry. [10]

Layer by layer. Complex solids reduce to 2D shape and bottom-up process.

6. List one most important advantage and one most important disadvantage with rapid prototyping technology.[10]

Advantage: no tooling for complex shape product.

Disadvantage: poor accuracy (due to slice by slice, tessellation phenomenon).

  1. List one similarity and one difference of the power-based additive manufacturing technology from power metallurgy technology. [10]

Similarity: powder as a starting material.

Difference: in powder-based additive manufacturing technology, powders gather together into a solid based on the heat fusion principle, while in MP, the powers gather together into a solid based on the external-pressure diffusion process.

  1. Explain the atomization process to make metal powder.[20]

High speed air jet hits liquids into liquid drops, and liquid drops then solidify into solids.

  1. List two most important unique features with parts made by PM technology as opposed to all existing manufacturing technologies (excluding PM). [10]

Impregnation oil products

Composite products with one material being a foam and the other being fillers.

1