View Printable VersionHome > Resources > Case Studies > Hydraulic Valve Body And Pump Manufacturer Case Studies

Hydraulic Valve Body And Pump Manufacturer Case Studies

Case Study # 1

Part Information:

Part Name
Bore Diameter Range

Valve Body
4.62-23.55mm diameter bores

Material Specifications:

Material
Hardness

1215 Cold Drawn Steel
28-32 Rc

Incoming Tolerances:

Stock to be Removed
Bore Length
Roundness
Surface Finish
Straightness

0.050-0.063mm
80 - 108mm
0.005mm
1.6um Ra
0.005mm

Barnes Processing Machine & Tooling:

Model
Honing Work Stations
Honing Tool Abrasive
Coolant

MSSP-1000-L3
3
D46-D252
Oil

Required Tolerances:

Bore Diameter
Roundness
Surface Finish
Straightness

0.0025mm for size
0.0025mm
<0.25um Ra
0.0025mm

Final Tolerances Achieved:

Bore Diameter
Roundness
Surface Finish
Straightness
Processing Time/Bore

<0.0025mm
<0.002mm
<0.2um Ra
<0.002mm
30 seconds/bore average

Case Study # 2

Part Information:

Part Name
Bore Dimensions

Hydraulic Pump Barrel
18.96mm diameter bore (11 holes)

Material Specifications:

Material
Hardness

Powdered Metal
220 Rb

Incoming Tolerances:

Bore Diameter
Bore Length
Relief
Roundness
Surface Finish
Straightness

18.89mm
44.00mm deep (blind hole)
6.0mm
0.008mm
0.8um Ra
0.008mm

Barnes Processing Machine & Tooling:

Model
Honing Work Stations
Honing Tool Abrasive
Coolant

HV-1000
1
D46
Oil

Required Tolerances:

Bore Diameter
Roundness
Surface Finish
Straightness

18.96mm +0.013mm/-0.00mm
0.003mm
<0.2um Ra
0.003mm

Final Tolerances Achieved:

Bore Diameter
Roundness
Surface Finish
Straightness
Processing Time/Bore

18.967mm +/-0.0025mm
<0.003mm
<0.17um Ra
<0.003mm
70 seconds/bore average

Case Study # 3

Part Information:

Part Name
Bore Dimensions

Hydraulic Pump Barrel
16mm diameter bore (9 holes)

Material Specifications:

Material
Hardness

MPIF FN-0208
90 Rb

Incoming Tolerances:

Bore Diameter
Bore Length
Bore Relief
Roundness
Surface Finish
Straightness

15.947mm +/-0.008mm
29.100mm deep (blind hole)
8.00mm
0.008mm
0.4um Ra
0.008mm

Barnes Processing Machine & Tooling:

Model
Honing Work Stations
Honing Tool Abrasive
Coolant

HV-1000
1
D46
Oil

Required Tolerances:

Bore Diameter
Roundness
Surface Finish
Straightness

16mm +0.005mm/-0.006mm
0.003mm
<0.2um Ra
0.003mm

Final Tolerances Achieved:

Bore Diameter
Roundness
Surface Finish
Straightness
Processing Time/Bore

16mm +/-0.0025mm
<0.003mm
<0.18um Ra
<0.003mm
50 seconds/bore average

Case Study # 4

Part Information:

Part Name
Overall Dimensions

Hydraulic Control Valve Block
170mm Width, 312mm Height, 575mm Length

Material Specifications:

Material
Hardness

FCD 500
HB156-228

Incoming Tolerances:

Bore Diameter

Bore Lengths
Roundness
Surface Finish
Straightness
Cylindricity

28.140 +/-0.01mm
33.950 +/-0.01mm
35.980 +/-0.01mm
246, 308, 312mm
0.010mm
12.5 Rmax
0.015mm
0.020mm

Barnes Processing Machine & Tooling:

Model
Honing Work Stations
Honing Tool Abrasive
Coolant

MSSP-1000 HD-XY5 Single Pass
5
D39 – D181, plus SiC Brush
Oil

Required Tolerances:

Bore Diameter
Roundness
Surface Finish
Straightness
Cylindricity

Target +/- 0.001mm
0.001mm
1.6 Rmax
0.001mm
0.0015mm

Final Tolerances Achieved:

Bore Diameter

Bore Lengths
Roundness
Surface Finish
Straightness
Cylindricity

28.190 +/-0.001mm
34.010 +/-0.001mm
36.045 +/-0.001mm
<0.001mm
<1.60 Rmax
<0.001mm
<0.0015mm
120 seconds/bore (4 honing & brush pass = 5 total)