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Downloadable References:
�
Crimping Parameters Chart
�
One
Piece Skive (OPS) Crimping Parameters
�
One
Piece Braid (OPB) Crimping Parameters
�
One
Piece Non-Skive (OPNS) Crimping Parameters
KEY RECOMMENDATIONS
� Referring to the appropriate table, check for
the crimping diameter and select the die set with the closest
size.
� The use of die sets, with diameter
significantly smaller than the recommended one, can cause
ferrule flowering (i.e. ferrule surface with pinches between the
dies) and cracks during the crimping operation.
� The die set selection should be done ensuring
the maximum die landing on the ferrule surface with the minimum
flowering effect. This will provide a proper crimping, reducing
the risk of ferrule surface cracks and damage of the protective
zinc-plating.
� The use of recommended Manuli hoses,
couplings, machines and tools ensure optimized performance
results.
� Limited quantities of light paraffinic oils
can be used to obtain an easier insert pushing operation./
� Hydraulic assembling procedures should include
insert bore collapse control process to check for the assembling
performance reliability.
HYDRAULIC ASSEMBLING PROCEDURE
RECOMMENDATIONS
1. COMPONENTS SELECTION
Select the specified hoses, ferrules and inserts
using the most updated Doc�s - MRI Fluid connectors catalog.
2. HOSE CUTTING
In order to ensure a perfect cut of the hose
(minimum rosetting and tulip effect due to the heat damage to
the rubber) it is recommended you use the appropriate blade
type:
� wire spiral and Spirtex: use a scalloped blade
� wire braid use a serrated or scalloped blade
Scalloped blade is preferred for both
applications.
3. SKIVING OPERATIONS
When skiving is required, the machine set-up
should be performed ensuring that the knife position is set in
order to achieve a removal of the rubber hose cover respecting
the tolerance reported in this document. It is important to
remove the maximum thickness of the rubber hose cover without
damaging or displacing the reinforcement steel wires.
4. COUPLINGS ASSEMBLING
Place the ferrule fully into the hose and then
insert the coupling.
Especially in case of large hose sizes and
interlock type couplings, the use of a proper pushing machine is
recommended to facilitate this operation.
In order to ensure full insertion of the hose
into the couplings, it is recommended that the hose insertion
depth be marked on the hose prior to mounting the couplings.
5. DIE-SET SELECTION
Set up the crimping machine, select he right
dimension die set closest to the recommended dimension (e.g. for
a crimp of 23mm choose the die set marked 22mm).
6. CRIMPING OPERATION
Crimp to the specified diameter in the enclosed
table, with a tolerance of +0/-0.2mm (0/-0.008 inch). For the
correct positioning of the crimp-dies during crimping
operations, please refer to the attached drawings showing dies
positioning and required ferrule appearance after crimping.
7. CRIMPING CONTROLS
Inspect the crimping dimension in the die-set
landing area, using a vernier calipers or micrometer as follows.
For mass production crimping operations, it is recommended to
use the bore collapse control procedure described below:
Take three crimping diameter readings at 120
degrees to one another. All three readings taken in the
mid-length of the ferrule should be to the prescribed crimp
diameter and within a tolerance of +0/-0.2mm (0/-0.008 inch) (a
deviation of the three readings by more than 0.2mm (0/-0.008
inch) indicate a non-concentric crimp. If the correct crimp has
not been achieved, adjust the machine set-up by 0.1mm steps to
achieve the correct diameter.
Repeat the same data collection at the top and
bottom of the ferrule just crimped. If those readings deviate by
more than 0.4mm (0.0016 inch) then the crimp is tapered. Should
a non-concentric or tapered crimp be identified, then the
machine die-head, springs and dies should be inspected and
replaced where necessary.
8. WARNING
Avoid double crimping of the ferrules. The
double crimping of the ferrules can reduce the assemblies�
service life. The dies must cover completely the ferrule length.
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