The flashcards below were created by user
joshuacassel
on FreezingBlue Flashcards.
-
Aluminum Oxide:
What are Aluminum Oxide grinding wheels mainly used for?
- High tensile strength materials
- Including all ferrous metals except cast iron.
-
Aluminum Oxide:
What colours do Aluminum Oxide wheels general come in?
grey-ish to white in colour, with the latter being the purest and most brittle.
-
Manufacture of Aluminum Oxide:
From what Ore is Aluminum Oxide made?
Bauxite Ore
-
Silicon Carbide:
What are Silicon Carbide grinding wheels mainly used for?
- Low tensile strength materials: Aluminum, Brass, and Bronze
- High density materials: Cemented carbides, stone, and ceramics
- Cast iron and non ferrous ramics
-
Silicon Carbide:
What colours do Silicon Carbide wheels generally come in?
Green to black
-
Silicon Carbide:
What are green Silicon Carbide grinding wheels generally used for?
Cemented carbides and other hard materials
-
Silicon Carbide:
What are black Silicon Carbide grinding wheels generally used for?
- Soft nonferrous materials: Aluminum, brass, and copper
- Cast iron
- Ceramics
-
Manufacture of Silicon Carbide:
What are the main ingredients used to make Silicon Carbide grinding wheels?
A mixture of Silica sand and high-purity coke.
-
Zirconia-Aluminum Oxide:
What are Zirconia-Aluminum Oxide grinding wheels generally used for?
- Heavy duty rough and finish grinding in steel mills
- Snagging in foundries
- The rapid rough and finish grinding of welds in metal fabrications plants
-
Zirconia-Aluminum Oxide:
What advantages does Zirconia-Aluminum Oxide have over standard Aluminum Oxide grinding wheels?
- Higher grain strength
- Higher impact strength
- Longer grain life
- Maintains its shape and cutting ability under high pressure and temperature
-
Boron Carbide:
What is the abrasive Boron Carbide used for?
- It is used as a loose abrasive: as it is not suitable for use in grinding wheels
- Used in the manufacture of precision gages and sand blast nozzles: because of its extreme hardness
- Crush dressing rolls: superior to tungsten carbide rolls
- A relatively cheap substitute for diamond dust
-
Manufactured Diamonds:
What is the main element used in Man-Made Diamonds?
Carbon
-
Manufactured Diamonds:
Name 3 types of Man-Made Diamonds?
-
Diamond Types:
For the diamond type RVG, the letters RVG indicate what?
That this type may be used with a resinoid or vitrified bond grinding
-
Diamond Types:
For the diamond type MBG, the letters MBG indicate what?
That this type is used in metal-bonded grinding
-
Ceramic Aluminum Oxide:
What is the major difference between Ceramic Aluminum Oxide and that of both Aluminum Oxide and Zirconia-Aluminum Oxide wheels?
- Ceramic Aluminum Oxide: submicron-sized particles are sintered to provide a single abrasive grain.
- ZAO and AO: made from fused aluminum oxide which is then crushed is then crushed to the desired particle size.
-
Grinding Wheels:
What are the four main components of a grinding wheel?
- Abrasive grain
- Bond
- Grade
- Structure
-
Abrasive Grain:
What is the function of the abrasive?
To remove material from the surface of the work being ground
-
Abrasive Grain:
How is grain size determined?
by the number of meshes per linear inch that are on a screen that the grain can pass thur.
-
Abrasive Grain:
What grain size range does the label "Very Coarse" cover?
6 to 12 grain size
-
Abrasive Grain:
What grain size range does the label "Coarse" cover?
14 to 24 grain size
-
Abrasive Grain:
What grain size range does the label "Medium" cover?
30 to 60 grain size
-
Abrasive Grain:
What grain size range does the label "Fine" cover?
70 to 120 grain size
-
Abrasive Grain:
What grain size range does the label "Very Fine" cover?
150 to 240 grain size
-
Abrasive Grain:
What grain size range does the label "Flour Size" cover?
280 to 600 grain size
-
Abrasive Grain:
What grain size range is appropriate for rough grinding?
8 to 54 grain size
-
Abrasive Grain:
What grain size range is appropriate for precision grinding processes?
54 to 400 grain size
-
Abrasive Grain:
What grain size range is appropriate for ultra precise grinding requiring 2 to 4 μ finish or finer?
320 to 2000 grain size
-
Abrasive Grain:
When rapid removal of metal is required, what type of grain should be used?
Coarse grain
-
Abrasive Grain:
When smooth and accurate finishes are required, what type of grain should be used?
fine grain
-
Abrasive Grain:
Generally when grinding soft materials, what grain should be used?
coarse grain
-
Abrasive Grain:
Generally when grinding hard materials, what grain should be used?
fine grain
-
Abrasive Grain:
When large amounts of material is to be removed, what type of grain is used?
Coarse grain
-
Abrasive Grain:
When large amounts of material is to be removed, what type of grain is used?
Coarse grain
-
When making finishing passes, what type of grain is used?
Fine grain
-
Abrasive Grain:
When the wheel is making a large area of contact, what type of grain should be used?
Coarse grain
-
Abrasive Grain:
When the wheel is making a small area of contact, what type of grain should be used?
Fine grain
-
Bond Types:
What 2 bond types are best suited for rapid removal of material?
Vitrified and Resinoid bonds
-
Bond Types:
What 2 bond types are best suited for high finishes?
Rubber and Shellac bonds
-
Bond Types:
What bond type is best suited for keeping heat generated to a minimum?
Silicated bond
-
Bond Types:
What bond type is used mainly on diamond wheels?
Metal bonds
-
Grade:
The grade of a grinding wheel may be defined are what?
As the degree of strength with which the bond holds the abrasive particles in the bond.
-
Grade:
Hardness of material:
A hard grade wheel is generally used on, what type of material?
soft material
-
Grade:
hardness of material:
A soft grade wheel is generally used on, what type of material?
hard material
-
Grade:
How are wheel grade symbols indicated, and what is the softest and hardest on the scale?
- wheel grade symbols are indicated alphabetically, ranging from A to Z
- A is the softest
- Z is the hardest
-
Grade:
If the area of contact between the wheel and the workpiece is large, what grade of wheel should be used?
soft grade wheel (A)
-
Grade:
If the area of contact between the wheel and the workpiece is small, what grade of wheel should be used?
hard grade wheel (Z)
-
Structure:
How is the structure of a grinding wheel indicated and which is the most dense and open structures?
- The structure of a grinding wheel is indicated by numbers ranging from 1 to 15
- 1 is the most dense
- 15 is the most open
-
Structure:
Soft materials will require a wheel with what type of structure?
open structure (15)
-
Structure:
Hard material will require a wheel with what type of structure?
dense structure (1)
-
Structure:
A greater area of contact will require a wheel with what type of structure?
open structure (15)
-
Structure:
Which structure provides a better finish?
A dense structure will produce a better finish
-
Standard Grinding Wheel Shapes:
Straight (Type 1)
-
Standard Grinding Wheel Shapes:
Cylinder (Type 2)
-
Standard Grinding Wheel Shapes:
Tapered; both sides (Type 4)
-
Standard Grinding Wheel Shapes:
Recessed; one side (Type 5)
-
Standard Grinding Wheel Shapes:
Straight Cup (Type 6)
-
Standard Grinding Wheel Shapes:
Recessed; both sides (Type 7)
-
Standard Grinding Wheel Shapes:
Flaring cup (Type 11)
-
Standard Grinding Wheel Shapes:
Dish (Type 12)
-
Standard Grinding Wheel Shapes:
Saucer (Type 13)
-
Types of Surface Grinders:
- Horizontal Spindle
- Reciprocating table
-
Types of Surface Grinders:
- Horizontal Spindle
- Rotary Table
-
Types of Surface Grinders:
- Vertical Spindle
- Rotary Table
-
Types of Surface Grinders:
- Vertical Spindle
- Reciprocating Table
-
Types of Surface Grinders:
What advantage do vertical spindles have over horizontal spindles?
vertical spindle grinders have a higher metal-removal rate
-
Truing and Dressing a Grinding Wheel:
Define the Process of Truing a wheel.
Truing is the process of making a grinding wheel round and concentric with its spindle axis and producing the required from or shape on the wheel.
-
Truing and Dressing a Grinding Wheel:
Define the process of Dressing a wheel.
Dressing a wheel is the operation of removing the dull grains and metal particles.
-
Truing and Dressing a Grinding Wheel:
At roughly what angle is the diamond on a diamond dresser tilted from the vertical?
10° (5° to 15°)
-
Truing and Dressing a Grinding Wheel:
Describe how a diamond dresser is set for dressing a grinding wheel?
The diamond is pointed in the direct of the wheel's rotation and then moved past the wheel's center.
-
Work holding devices:
Name the 2 types of magnetic chucks used on surface grinders.
- Electromagnetic chuck
- Permanent magnetic chuck
-
Magnetic Chuck Accessories:
What is an adapter plate used for?
- an adapter plate is used to securely hold thin work, less than 1/4 or 6mm thick
- it converts wider pole spacing of the chuck to finer spacing with more but weaker flux paths
-
Magnetic Chuck Accessories:
What are Magnetic chuck blocks used for?
They provide a way to extend the flux paths to hold workpieces that cannot be held securely on the chuck face
|
|