Product
Pages
Honing
Superfinishing
Tape
Finishing
Machines
Fields
of applications
Machining
of radii with
crankshafts
Type
series of the machines
Working
example crankshaft
Deep Hole Drilling Machines
Assembly & Leak Testing Machines
Leak Testing Machines
Services
Tape Finishing
PERMAT supplies tape finishing machines for crankshafts and camshafts.
Click on the image opposite to see an enlarged view.
Fields of application
In engine manufacture for finish machining of:
Crankshafts for mains,
crankpins, thrust faces, oil seal diameters.
In this case a surface suitable for its purpose is achieved, i.e. without
cross-hatch pattern.
Camshafts at all bearing points
and additionally for the cam lobes.
Pump shafts with bearing seats
and oil seal diameters, nontwisting.
Lever arms and rocker arms with their spherical working and operationting
faces for cam lobes
and valves, respectively.
Front faces of stroke curves on steering wheels.
In
gear manufacture for manufacturing of:
Main shafts for sliding and roller raceways as well as bearing journals,
i.e. needle bearing raceways.
Drive shafts and output drive
shafts with needle bearing raceways and oil seal diameters, nontwisting.
What
is Tape Finishing?
Tape Finishing is a proven method of finish machining raceways for sliding
and antifriction bearing. Polishing tape and microfinishing film serve as
"cutting tool". The cutting tool is pressed against the component surface
by means of formed tool shoes with half-elastic or hard supports which are
hardly subject to any wear.
Technological
features
Quick stock removal is achieved by two simultaneously working movements, i.e.
by the component rotation in direction of rotation and the short-stroke oscillation
movement in direction of the component axis. Thereby the surface quality is
considerably improved. With each component change the finishing tape is feed
forward to supply new unused cutting grains thus achieving constant conditions
for stock removal and final quality in each working cycle.
One operation produces two results - cutting and smoothing. At first, the newly applied cutting medium with its very sharp grains produces a good cutting effect; stock is removed. In the further course of the finishing operation the cutting grains are flattened, break away, the finishing tape becomes loaded. Thus the smoothing effect is increased.
Tool
monitoring = process security
With tape finishing the tape feed is monitored and tape end or tape breakage
are checked in each working cycle. These tape detection facilities make it
possible to link the machines in automatically working production plants without
needing any additional monitoring staff.
In
Motor and chassis
manufacture for bearing and oil seal raceways on:
Toothed racks of servo-steering.
Drive shafts.
Linchpins.
Machining of radii with crankshafts
Here, not
only the bearings but also the adjacent blended radii are intensively finish
machined by tape finishing. This operation requires specially formed shoes
in the basic tools, laterially slotted polishing tapes and a special control
sequence.
Back
SF/HF Standard Tape Finishing Machine for manual loading and unloading directly into the working area. Moreover, for automatic linking, the design HF can be expanded by suitable gripping systems.
UF
Back
Universal Tape Finishing Machine with flexible finishing units for components with different finishing positions, stroke sizes and bearing widths. Short change-over times are achieved by means of a quick-change facility for component-related change parts. Also available with NC-axes programs for automised adjustment functions.
| Description Machine | Petrol engine (car) | Diesel engine (truck) |
| Design
Component length Material Tensile strength |
2
TF 6 4-cylinder crankshaft 455.0 mm GGG 60 nodular graphite cast iron HB 220-275 |
UF 10 6-cylinder crankshaft 785.0 mm alloyed steel hardened HRc 48-52 |
| Machining task | 5
x main bearing 4 x crankpins 2 x thrust face/axial bearing 2 x oil seal diameter |
7 x main bearing 6 x crankpins 2 x thrust face/axial bearing 1 x oil seal diameter |
| Premachining
Surface roughness |
ground
Ra 0.6-0.7 µm Rz 6-7 µm |
ground
Ra 0.4-0.5 µm Rx 4-5 µm |
| Cutting
medium Quality/grain size Tape consumption Stock removal on dia |
micro
finishing film 30 µl5 mill (Ron see symbols) 15 mmy/bearing point 0.004-0.006 mm |
Polishing tape RB 346/320 2 x 20 mm/bearing point 0.006-0.010 mm |
| Surface
roughness After finishing Machining time Cycle time/machine Machine output |
Ra
0.2-0.25 µm
Rz 2-3 µm 18 sec. 0.6 min 100 comp./h at 100% eff. |
Ra
0.1-0.15 µm
Rz 1.0-1.25 µm 2 x 20 sec. 1.6 min 36 comp./h at 100% eff. |
| Design principle of The finishing unit | Master shaft principle | Flexible design |
Permat
Machines Limited
Station Road, Coleshill,
Birmingham
England B46 1JG
Tel:
+44 01675 463351 Fax: 01675 465816
Telex: 336040
Nagel
Maschinen-und
Werkzeugfabric GmbH
P.O. Box 1709 D-7440 Nurtingen
Tel: 07022 605-0 Telex: 7267337