KS PERMAGLIDE® plain bearings are made from metal-plastic composite materials. The combination of steel, non-ferrous metals and polymers creates materials with excellent tribological characteristics. The composite, multi-layered materials have a high rigidity and viscosity thanks to the steel back and very good sliding properties thanks to the sliding layer structure of bronze and polymers.
KS PERMAGLIDE® materials are used to make sheets in thicknesses of 0.5 mm to 3 mm on high-volume machines as primary materials. The sheets can be used to make sliding elements from KS PERMAGLIDE® in a wide range of designs using all conventional sheet metal processing methods.
The conventional machining options for KS PERMAGLIDE® materials include
- Cutting blanks, e.g. with a plate shear
- Drilling and sinking, e.g. mounting holes
- Nibbling or punching moulded parts
- Reshaping through bending, edging and deep drawing
- Rolling large bushes
- Shaping through water jet cutting or high precision cutting
- Milling of grooves and recesses
Motorservice offers a wide range of special shapes to suit your requirements, e.g. for machining moulded parts. Machining is carried out according to the high quality standards of the automotive industry with tolerances in accordance with DIN ISO 3547 or more precise. The Motorservice sales team can advise you on the design, material selection and quality of your other designs.
High temperatures cause burns to the cut surfaces. The carbon deposits can be abrasive! Clean the cut surfaces carefully if necessary.
The cutting takes place on the jet side to prevent the sliding layer from being washed away.
- Machining the sliding layer
The sliding layer of KS PERMAGLIDE® P22 and P202 has a machining allowance of around 0.15 mm. This can be machined by turning, drilling or reaming to:
- Achieve smaller clearance tolerances
- Compensate for misalignments
Tried and tested methods are turning and boring with:
- Dry cutting
- Cutting speeds from 100 to 150 m/min
- Feed rate of 0.05 mm/rev
- Cutting depth of max. 0.1 mm
- Hard metal tools
- Machining temperatures above 140 °C constitute a health hazard.
- P22 chips contain lead. Lead is hazardous to health.
- Changes in colour may occur on the polymer sliding layer due to high-energy radiation e.g. UV-light. To protect the surfaces, exposure to direct sunlight should be avoided.
- Removing more material reduces service life.
- Inexpert machining will have a negative impact on service life and load bearing capacity.
- Parts must be cleaned after machining.
- Machining the bearing elements
- KS PERMAGLIDE® plain bearings can be cut or can be machined in other ways (e.g. shortening, bending or boring).
- KS PERMAGLIDE® plain bearings should preferably be cut from the PTFE side. The burrs produced during cutting would impair the sliding surface.
- Bearing elements must be cleaned after machining.
- Bare steel surfaces (cut edges) must be protected against corrosion with:
- Oil, or
- Galvanic protective layers
At higher low densities or with longer coating times, the sliding layers must be covered to prevent deposits.
Machining temperatures that exceed the following limits are hazardous to health:
+280°C for KS PERMAGLIDE® P1
+140°C for KS PERMAGLIDE® P2
Chips may contain lead.
- Calibrating the bearing bore after mounting
(Only applies to P1 plain bearings)
KS PERMAGLIDE® plain bearings are ready to install on delivery, and should only be calibrated if a bearing clearance with a narrower tolerance cannot otherwise be reached.
Calibration considerably shortens the service life of KS PERMAGLIDE® P1 bushes.
The illustration shows calibration using a mandrel.
The table contains standard values for the diameter of the calibrating mandrel dK. Precise values can only be ascertained through tests.
The bearing clearance tolerance can be reduced through the following measures, which do not adversely affect service life:
- Narrower tolerances for housing bore
- Narrower shaft tolerances
1 Calibrating mandrel, case hardening depth Eht > 0.6, HRC 56 to 64
2 KS PERMAGLIDE® P10 bush
B Liner length
DiE Diameter of the bush in press-it state
dK Diameter of the calibrating mandrel
r Edge, rounded
Desired inside diameter of the bush Diameter of calibrating mandrel1) dK Service life2) DiE -
100 % LN
80 % LN
60 % LN
30 % LN
Standard values for the calibrating mandrel diameter and the reduction in service life
DiE Inside diameter of the bush in press-fit state.
1) Standard value, based on steel housing.
2) Standard value for dry running.
Take a look at our application examples with KS PERMAGLIDE® plain bearings