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TECHNOLOGY | Technology1
We aspire to be an excellent company providing high-quality products

1. Sorts of Bond and Properties

 

1) Metal Bond(symbol M)

The metal bond is manufactured by mixing the metal power such as iron, bronze, tungsten, and cobalt, etc. with super-abrasive
(Diamond, CBN) and sintering it.

 

* Properties
- High Grinding Ratio
- Excellent in Form-maintaining ability
- Excellent in Bond’s Toughness, Abrasivity-Resistance, and thermal resistance
- It requires high grinding power.
- Easy occurrence of clogging and brittleness because of its excellent coherent power of abrasive grain

 

2) Resin Bond (symbol B)
It is manufactured by mixing synthetic resin (phenol series, polyimide series) and filler with abrasive grain.

 

* Properties
- Excellent in Free-Cutting Ability
- It can create excellent processing surface and high grinding performance due to plenty of elasticity.
- Wide Applications
- It’s available to use it even by low grinding power.

 

3) Vitrified Bond (symbol V)
It’s a fragile bond manufacture by using vitric binding agents, and it is more excellent in coherence than resin bond;
in addition, it can regulate solidity and chip-discharging performance by giving change to porosity.

 

* Properties
- It has a very excellent abrasivity-resistance
- It has an excellent form-maintaining ability
- It’s easy for truing and dressing.
- It has a wide range of surface roughness.
- It creates less clogging and heat release.

 

 

2. Comparison of Performance Properties by Bond

 

Properties of Grinding Wheel by Bond

Grinding Property

Resin

Metal

Vitreous

Electroplating
Life Span of Grinding
Wheel

Medium

High

High

Low

Material Removal Rate

High /Medium

Medium

High /Medium

High

Form Retaining Power

Medium

High

High

High

Required Power

Medium

Medium / High

Low

Low / Medium

Difficulty in Truing/ Dressing

Medium

High

Low

Usual Needlessness

Surface Roughness

Good

Good / Average

Best

Diverse

 

3. Wheel Structure according to sorts of Bond

 

 

4. Comparison of Abrading Agent Toughness

 

 

5. Form of Abrasive Grain(Diamond, CBN)

 

 

6. Grain-size Chart of Abrasive Grain

 

GRANULARITY

FEPA

APPLICATION

MESH

MICRON(㎛)

APPLICATION

#20/30

D/B 852

 

#600

30~40

Lapping

#30/40

D/B 602

 

#700

22~36

 

#40/50

D/B 427

 

#800

20~30

 

#60/80

D/B 301

 

#1000

15~25

 

#80/100

D/B 252

 

#1200

10~20

Polishing

#100/120

D/B 181

 

#1800

6~12

 

#120/140

D/B 151

grindigri

#2200

5~10

 

#140/170

D/B 126

 

#3000

4~8

 

#170/200

D/B 107

 

#5000

3~6

 

#200/230

D/B 91

 

#8000

2~4

 

#230/270

D/B 76

 

#12000

1~3

 

#270/325

D/B 64

 

#14000

0~2

 

#325/400

D/B 54

 

#28000

0~1

 

#400/500

D/B 46

 

#60000

0~1/2

 

 

7. Optimum Wheel Peripheral Speed= External Diameter of Wheel X 3.14X Rev Count of Pivot(R.P.M)= m/min

 

Binding Agent

Using Condition

WHEEL

CBN WHEEL

RESIN WHEEL

Use of Wet Process

900 ~ 1800

1000 ~ 2000

 

Use of Dry Process

700 ~ 1200

800 ~ 1500

METAL WHEEL

Use of Wet Process

800 ~ 2000

800 ~ 1500

 

Use of Dry Process

500 ~ 800

-

VITRI WHEEL

Use of Wet Process

Less than1500

More than1800

Surface Roughness

Good

Good / Average

Best

 

8. Optimum Quantity of Depth of Cut

 

MESH

WHEEL

CBN WHEEL

80 ~ 120

0.025

0.02 ~ 0.05

140 ~ 200

0.0125

0.01 ~ 0.02

More than 230

0.006 ~ 0.01

Less than 0.01

 

9. Marking Method of Diamond & CBN Wheel

 

 

10. Processing Surface Roughness

 

Maximum Height
Max(㎛)

Centerline Mean
Roughness Ra(㎛)

Square Mean Cubic Root
Roughness Rrms(㎛)

Ten-point average
roughness Rz(㎛)

0.10.020.02

0.1

0.2

0.03

0.04

0.2

0.3

0.06

0.06

0.3

0.4

0.07

0.08

0.4

0.5

0.09

0.1

0.5

0.6

0.1

0.11

0.5

0.7

0.12

0.13

0.6

0.8

0.14

0.15

0.7

0.9

0.15

0.17

0.8

1

0.17

0.19

0.9

1.2

0.2

0.23

1.1

1.4

0.24

0.27

1.3

1.6

0.27

0.3

1.4

1.8

0.31

0.34

1.6

2

0.34

0.38

1.8

2.4

0.41

0.46

2.2

2.8

0.48

0.53

2.5

3.2

0.54

0.61

2.9

3.6

0.61

0.68

3.2

4

0.68

0.76

3.6

4.5

0.77

0.86

4.1

5

0.86

0.96

4.5

5.5

0.94

1.05

5

6

1.02

1.14

5.4

7

1.19

1.33

6.3

8

1.36

1.52

7.2

9

1.53

1.71

8.1

10

1.7

1.9

9.0