Grease Test Rig RHF 1
Catalog/Part Number:: K94800
Description
Test Method
The purpose of the
test is to measure the ability of a grease to lubricate at various high speeds,
temperatures and axial loads. The grease quality is measured by recording the
number of running hours before the grease ceases to lubricate and, as a
consequence, the bearings fail. The longer the number of running hours in the
test unit, the more effectively the grease lubricates under those conditions.
In this way the maximum operating speed, temperature and load for a particular
grease can be determined.
Features
Advanced flexibility
Customer application test possible
Free programmable test parameters
Frequent monitoring of test parameters
Windows 7-based software
Cast-iron housing with integrated heating system
and temperature insulation. The housing contains two test bearings mounted on a
high-precision shaft.
High-speed frequency motor drive.
Base frame including motor drive lubrication
system and pneumatics for applying axial load.
External cooling system for motor drive.
Electrical cabinet with integrated PC and
machine control systems.
Description
The Grease Test Rig
RHF 1 essentially consists of three parts – a mechanical test unit, an
electrical cabinet which incorporates the PC, the keyboard and the screen, all
control functions for the test mechanics and an external cooling system
supporting the high-speed spindle drive. All important parts of the machine can
be accessed from the front side. Various test bearings can be used. For the shielded bearings, the shields are
delivered separately. The high-precision shaft is rotated by a
frequency-controlled high-speed spindle drive. The cast iron housing contains two
heating elements. Each half of the housing has a temperature probe to check and
regulate the temperature. The bearings are mounted on a high precision
shaft in the housing and the whole mechanical test rig is assembled. The
bearings are slowly brought up to the speed and temperature at which the real
test starts. These tests can be long life grease tests or short term grease
tests to evaluate the condition of the test grease after a certain test
temperature is reached. Each bearing is individually temperature-controlled by
means of a thermocouple. When the test temperature increases beyond
preprogrammed limits, the unit will be switched off automatically (Sudden Death
Test).The test bearings are standard bearings with separate shields or without
shields. They are washed, rinsed, dried and lubricated with a specified
quantity of test grease. In the Grease Test Rig RHF 1, greases are checked
for their grease life in high-speed and/or high-temperature applications. The
longer the running time, the better the quality of the grease. Two test
bearings run as a pair in the cast-iron housing. Consequently, when one of the
bearings fails due to temperature rise or seizing, both bearings will stop
running, although the other bearing may still be in excellent condition (Sudden
Death Test Strategy).
Electrical Requirements
400V 50Hz 30 kVA 3 Phase
480V 60Hz 30 kVA 3 Phase
Valve Control Voltage: 24 V
Pneumatic System: Air Pressure 6 bar (87 psi) at least, clean, dry
air
Dimensions
wxdxh,in.(cm): 65.1 x 28.3 x 68.1 (165x72x173)
Net Weight: 1,934 lbs (895kg)
Additional Accessories
K94800-1 Test Setup for Bearing Type 6204 For
60,000 RPM Model
K94800-2 Test Setup for Bearing Type 7005 For
60,000 RPM Model
K94801-1 Test Setup for Bearing Type 6204 For
75,000 RPM Model
K94801-2 Test Setup for Bearing Type 7005 For
75,000 RPM Model
K94800-3 Test Bearing 6204
K94800-4 Test Bearing 7005
K94800-5 Shield Pressing Tool for Type 6204 Test
Bearing
Technical Specifications
Spindle Speed:
K94800/K94890:
60,000 RPM
K94801/K94891: 75,000 RPM
Test temperature: Up to 230 °C
Axial test load: 50 to 1 100 N/bearing
Drive: high-speed spindle
Operating system: Windows 7
Evaluation system: Industrial
panel PC
Test bearings
For pure high-speed grease testing
(synthetic cage):7005
For high-temperature/speed testing
(metal cage): 6204 shields delivered separately in the package
Grease filling grades
For pure high-speed grease testing: 10
to 15% of the free volume 0,71 to 1,06 cm3
For high-temperature/speed testing: 20
to 30% of the free volume, 1,4 g corresponds to 30% when the specific weight is
in a range of 0,9 to 1,0 g/cm3
Test parameters
For pure high-speed grease testing:
Speed rating for grease acc. 50,000 RPM = 1,8 mill. n × Dm
Maximum spindle speed possible 60,000 RPM = 2,16 mill. n × Dm
Maximum spindle speed possible 75,000 RPM = 2,7 mill. n × Dm
Axial load 50 to 350 N load applied pneumatically
Ambient temperature
Speeds and loads freely selectable and changeable during test duration
For high-temperature/speed testing:
Test bearing with shields or without shields
Speed rating for grease acc. 32,000 RPM = 1,072 mill. n × Dm
Maximum spindle speed possible 60,000 RPM = 2,01 mill. n × Dm
Maximum spindle speed possible 75,000 RPM = 2,7 mill. n × Dm
Axial load 50 ... 1,100 N load applied pneumatically
Temperature up to 230 °C
Speeds, temperature and loads freely selectable and changeable during test
duration
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