Ring Side-to-Groove Fixturefor Determining Sensitivity to
Microwelding
Piston material
Counterbore holds ring at bore diameter
Stationary groove
Piston ring with surface treatment
Simulated vertical & rotating motion between ring side surface and piston groove surface
Frequency of load applied can be varied
Temperature of groove and ring material can be varied
Fig. 11a Fig. 11b
Fig. 11c
CKE PROPIETARY INFORMATIONPRIVELEDGED AND CONFIDENTAL
Limited OverviewSection I
CKE PROPIETARY INFORMATIONPRIVELEDGED AND CONFIDENTAL
LS-10 RING SIDE MICROWELD AND WEAR
FIXTURE
Piston deflects as ring movesUp and down
AdjustableStroke of ringHolder assembly
LoadLoad
Simulates the effect of the ring in the grooveduring engine operation.
Mechanical drive system induces rotational valueto the piston ring as well as vertical components to simulate loading/unloading of the ring
Fig. 1
Varying temperatureOf piston
Detailed OverviewSection II
CKE PROPIETARY INFORMATIONPRIVELEDGED AND CONFIDENTAL
• Block fixture contains heaters to raise the relevant parts of the test to the required operational temperature of the piston ring groove. (Fig. 2)
• Dead weights attached to the base plate permits contact at ring/groove to be adjusted
Other Features:• Top ring land of the piston is
removed to allow functional access to the piston ring during the tests.
• The piston is securely held in the block to prevent any vertical movement within the block
• The piston is self-aligning to prevent edge loading of the ring. (Fig. 3)
LS-10 RING SIDE MICROWELD AND WEAR
FIXTURE
Abililty to modify ring to groove force
Ability to modify piston groovetemperature
Detailed OverviewSection II
CKE PROPIETARY INFORMATIONPRIVELEDGED AND CONFIDENTAL
• Ring is held in a ring holder that is loaded into the cavity of the wear fixture, (Fig. 4)
• Configuration when both relative ring rotary motionand vertical piston motion are being evaluated, (Fig. 5 a-b)
Fig. 5a Fig. 5b
Mechanism for oscillating piston groove surface with respect to groove side surface
LS-10 RING SIDE MICROWELD AND WEAR
FIXTURE
Overview of Operation
Detailed OverviewSection II
CKE PROPIETARY INFORMATIONPRIVELEDGED AND CONFIDENTAL
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1 2 3 4 5 6 7 8 9 10 11 12
Mic
row
eld
Dep
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Baseline rings
Average Microweld DepositsMicroscope / Visual
Microscope
Visual
High/Low
Run Settings:Load = 5#Temp = 500 FSpeed = 60 RPMDwell = 1.5 sec.Travel =.375 in.Test time – 1 min.Cycle Freq. – 20 CPM
Fig. 12Microweld test on Twelve (12) rings / pistons
Microweld Testing Results
LS-10 RING SIDE MICROWELD AND WEAR
FIXTURE
Test results utilizing twelve (12) different base ring materials,ring side treatments and pistongroove surface treatments
Section II
CKE PROPIETARY INFORMATIONPRIVELEDGED AND CONFIDENTAL
Ring Side Wear Measuring Device / Procedure
• Radial profile measurements of bottom side of ring are taken at 12 locations around ring using device shown in Fig. 1 before and after every test
• Acquired data is automatically recorded on spreadsheet for the 12 locations
• Note: In development of proceduresKeystone Width/Angle gage was used to validate wear depths at specific locations to ensure that both readings were in good correlation
Fig. 1Ring Profiles Measuring Device
LS-10 RING SIDE WEAROptional System
Section III
CKE PROPIETARY INFORMATIONPRIVELEDGED AND CONFIDENTAL
Fig. 2Ring Profiles in CAD Software for Lofting
• Data loaded into ring profiles using CADsoftware for each before and after location measurement
• Wear depth is then calculated from the difference between the before test ring model and the after test ring model
• Repeatable side wear rates are achieved when utilizing the above procedure
LS-10 RING SIDE WEAROptional System
Section III
CKE PROPIETARY INFORMATIONPRIVELEDGED AND CONFIDENTAL
• Initial runs were conducted on the wear fixture tocheck for repeatability and to establish standardtest parameters
• Initial runs were conducted with clean ShellRotella T oil
• Parameters used for all tests were obtained from these initial runs
• Tests were conducted with clean Shell oil and various side treatments and oils
Fig. ATest Repeatability
(Cast Iron Ring – Specific Lubricant/Test Conditions)
LS-10 RING SIDE WEAROptional System
Section III
CKE PROPIETARY INFORMATIONPRIVELEDGED AND CONFIDENTAL
Fig. BTest Repeatability
(Steel Ring with Side Treatment –Specific Lubricant/Test Conditions)
Fig. CRing Side wear/finish utilizing various
combinations of ring side treatments and oilsAverage Sz and SK
LS-10 RING SIDE WEAROptional System
Section III