Wood, concrete, steel, ceramic - used historically by industries for their performance benefits. Now, TIVAR®'s unique blend of attributes updates the design possibilities for engineers, equipment manufacturers and end-users.
TIVAR®'s low coefficient of friction approaches that of Teflon® and can outperform polished stainless steel in moving difficult materials and mechanisms. TIVAR®'s clean, self-lubricating surface allows moving parts, like belts and chains, to move smoothly; without premature wear or putting undue tension on expensive components. Powdery or cohesive materials slide freely across TIVAR®'s surface, as do objects like bottles and packages.
TIVAR®'s unique molecular structure makes it inherently superior in withstanding sliding abrasion. In the Sand Slurry and Sand on Wheel Abrasion Tests, TIVAR® outperforms standard work surfaces. TIVAR® compares favorably against AR sheet, HDPE, nylon and acetal. TIVAR® linings protect expensive structures from premature wear and replacements.
Many materials can't take it: shock from heavy or repeated blows. They crack, shatter, splinter or show stress fatigue. TIVAR® material does not break when subjected to the single notch ASTM D-256 Izod Impact test. TIVAR® will not break at temperatures even in cryogenic ranges.
TIVAR® withstands attack from harsh chemicals, and it exhibits zero water absorption. Steam cleaning, washdowns, salt water and caustic compounds (like sodas) do not damage TIVAR®. TIVAR®'s smooth surface keeps machinery moving without lock-ups caused by corroded metal edges.
Want to get the best performance? Faster quotes? Shorter lead times from prototypes to production?
Answering these questions below will help us give you the excellent results you want.
-What is the function of the part and how does the assembly operate?
-What are the desirable material properties?
-What is the existing material and how is it manufactured on processed?
-What is the required service life?
-What are the consequences of part failure and what is typical failure mode?
-Can the design be revised or simplified?
-How is the part stressed in service and what is the magnitude of the stress, such as load?
-What is the stress/time relationship, and how much deformation can be tolerated before it is termed a failure?
-What are the effects of friction and wear?
-Does the part absorb impact?
-What tolerance are required?
-Which dimensions are most critical for optimal performance?
-Operating temperatures and range of fluctuation; time/temperature relationship
-Humidity and moisture
-Exposure to sunlight and weathering
-Chemical exposure and concentration
-What is the cost/benefit relationship? Will superior performance justify a higher prize?
-Is there a requirement for insulation, static reduction, or conductivity?
-Texture and surface finish requirements
Plastic bearing clearances should be much greater than those recommended for metallic bearings. Adequate consideration for shaft clearance needs to be followed due to frictional heat build-up that can significantly change the dimensions of the bearing.
Press Fitting TIVAR® Bearings
- Add .8 to 1.0% to the nominal OD on bearing:
- B = Do - Df/Df (100) where B = .8 to 1.0%, Do = bearing OD, Df = mating bore diameter
- Bearing length to diameter should be equal to or less than 1.5: L/D = 1.5
- For each .004" or .10mm added to the nominal bushing OD for press-fitting into a housing, the bushing ID will close in .001" or .02mm.
Shaft Diameters/TIVAR® Bearings
- To produce a running fit, increase the nominal bearing ID by .001" or .03mm for shaft diameters less than 1" or 25mm in size.
- To produce a running fit on shafts 1" or 25mm and larger, increase the nominal bearing ID by .003" or .07mm for each 1" or 25mm size.
- Recommended bearing wall thickness is 1/10th of shaft diameter when designing a TIVAR® bearing.
- Increase the wall thickness for shock load conditions and decrease the wall thickness for applications near PV limits.
- It is recommended that the length of a TIVAR® bearing be equal to the shaft diameter, unless under a high load, where more surface area is required to resist creep.
Lubricants reduce the static and dynamic coefficients of friction and permit materials to operate at higher PVs than without lubrication. While most plastics do not require lubrication, some type of lubricant will generally enhance bearing performance. In many cases, water will provide sufficient lubrication and cooling during bearing operation. At the time a plastic bearing is installed, it is a good idea to apply a light film of grease on the ID of the bearing prior to mounting on the shaft.
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