Technical Data／Diamond Rotary Dresser
Technical Data
Design Information for Forming Rotary Dresser
■Tolerances of Rotary Dresser Designs(mm)
Set approx half of the allowable tolerance of the workpiece. ■Dimensional Tolerances of Rotary Dressers
In dressing, the surface roughness of grinding wheels is influenced by elements such as: 1. Peripheral speed ratio (Vr/Vs), 2. Infeed per revolution of wheel (Ar), and 3. Dress out (Na).
M
W
U
■Rotary Dresser Accuracy Limits
1. Peripheral Speed Ratio
Other tolerances available upon request
15
Accuracy (mm)
Test Condition
① Influence of Peripheral Speed Ratio on Grinding Wheel Surface Roughness
Item
Factor
Symbol
Illustration
Grinding Wheel Rotary Dresser
WA60K #20/30
L L
Width
L
± 0.005
●Control of the grinding surface accuracy by up-dressing is easier than by down-dressing ● Higher feed rate creates more open grinding surface(grinding ability increases)
Grinding Wheel Peripheral Speed
Vs=29 m/s
S
10
U value
W value
Y value
M value ≥ L ≥ L ≥ 0.5L
Dress Out
Na=0
Radius
R ± 0.002
RZ type SZ type SX type
≥ 10 ≥ 10
RZ type SZ type SX type
≥ 0.5Z ≥ 0.5Z
RZ type SZ type SX type
≥ 10 ≥ 10
Infeed Per Rev.of Grinding wheel Ar= 0.18 µm/rev
0.002
≥ 3
≥ 4Z
≥ 4
Step
S
± 0.001
R
R
Down Dressing
Up Dressing
R
= 0.36 µm/rev = 0.54 µm/rev = 0.72 µm/rev
5
Profile
Profile Accuracy
0.002
Convex R
Convex R
0 1.5 1.0 0.5 0 -0.5 -1.0 -1.5 Peripheral Speed Ratio (Vr/Vs) Down dress Up dress
Concave R
Concave R
P P P
0.002
Angle
±1'
Straightness
ー 0.002
nP
P P P
Pitch Accumulative Pitch
*Convex R value
*Concave R value
P value
P nP
± 0.002 ± 0.004
RZ type
≥ 0.3
0.6
8
② Influence of Peripheral Speed Ratio on Dressing Force ● Larger peripheral speed ratio allows higher normal force (increasing in grinding ability) ● Tangential force shows the same tendency as normal force, but the value is much smaller
RZ type SZ type SX type
≥ 0.1 ≥ 0.2 ≥ 0.2
≥ 0.03 ≥ 0.15 ≥ 0.15
Bore
φH + 0.005 − 0
0.5
6
0.002
*Value depending on diamond grain sizes
0.4
Parallel
0.002
0.002
A
Profile
4
0.005
A
■Inspection of Rotary Dresser For higher accuracy・・・
Control
0.3
Body
Perpendicularity
0.002
0.002
Profile
2
Required accuracy of rotary dressers is becoming more strict, ranging from microns to submicrons. To ensure required accuracy, we have established an excellent inspection system with the most up-to-date equipment.
0.2
Runout of Profile Runout of Control
0.005
A
H
0.1
0
1.0
0.5
0
1.0 0.5
0 -0.5 -1.0
0.002
Peripheral Speed Ratio (Vr/Vs)
Peripheral Speed Ratio (Vr/Vs)
Description of Inspection
2. Infeed Rate
■Body Accuracy 1. Bore (Air micrometer) 2. Parallelism, squareness (Roundness measuring equipment) 3. Reference surface (controlφ) runout (Roundness measuring equipment) 4. Profile runout (Roundness measuring equipment)
■Inspection with Transfer Test Pieces 1. Measuring dimensional accuracy and profile (tool microscope, profile measuring equipment, projector) 2. Surface roughness (surface roughness tester) ■Slip Test Results An inspection sheet showing measurements taken by the transfer test is attached ■Rotary Dresser Runout-Reference Surface Roundness Measuring Equipment Inner Diameter Air Micrometer
① Influence of Infeed Rate of Grinding Wheel Surface Roughness
② Influence of Infeed Rate on Dressing Force
●Higher feed rates create a more open grinding surface (grinding ability increases) ●Longer dress-out time diminishes sharpness of the grinding surface
●Larger feed rate increases normal force. (Grinding ability increases) ●Tangential force shows the same tendency as normal force, but the value is much smaller.
◀Down Dress Na=0 (Na=Dress out wheel rotation frequency)
6
0.2 0.3 0.4 0.5
10
Down Dress
■Coupon (Plate)
■Coupon (Cylindrical)
Vr Vs
=0.81
8
4
Down Dress
Profile
Vr Vs
6
=0.16
◀︎ Down Dress Na=80 ◀︎ Up Dress Na=0
Tool Microscope Profile Measuring Equipment Profile Projector
2
Profile Tool Microscope Profile Measuring Equipment Profile Projector
4
Up Dress
0.1
Runout-Profile Roundness Measuring Equipment
Vr Vs
◀︎ Up Dress Na=80
=0.81
2
0
0.1 0.2 0.3 0.4 0.5 0.6
0 0.18 0.36 0.54 0.72
0
0.18
0.36
0.54
Surface Roughness Surface Roughness Tester
Surface Roughness Surface Roughness Tester
Infeed Rate（µm/rev）
Infeed Rate（µm/rev）
Infeed Rate（µm/rev）
Optional Specifications of Rotary Dressers
10
3. Dress Out
1.Improved Dressing Ability (for Fast Dressing) Optional Specifications for RZ Type ●GB-type Reduced concentration for improved sharpness ●ACROSS-type Improved sharpness by lowering the concentration and increasing the dischargeability of chips and grinding fluid Various options available upon request *Availability depending on profile or specification
Grinding Force
Influences of Dress Out on Grinding Wheel surface Roughness ●Longer dress out time increases roundness of the grinding surface, but reduces sharpness.
120
8
■ACROSS-typeSurface and Profile
100
6
80
4
Down Dress Up Dress
60
2
40
0
ACROSS- type
GB-type
Standard
80 150 240 320
Grinding Wheel Revolution During Dress Out (rev/sec)
※Set the value of standard product to 100
069
070
Made with FlippingBook flipbook maker