Product Description
The moving parts of the helicopter need to bear the centrifugal
force, the steering force and various alternating moments generated
by the rotation of the blades, and they need excellent rigidity and
good assembly dynamic balance. Therefore, as a hole system for
connecting the moving parts, it is necessary to ensure extremely
high aperture precision (H7 and above), good surface roughness
(titanium alloy generally needs to reach Ra1.6), and relatively
high positional accuracy. (see picture 1). Therefore, the finishing
of the hole system is generally used as the last step of the
machining of the moving parts, and is performed by a precision
machine tool with a high-performance tool.
Figure 1 Rigorous aperture and surface roughness should be
guaranteed in processing precision holes of helicopter moving
parts
Efficient tooling solutions for superior
quality
Limited to titanium alloy materials, precision holes for moving
parts cannot be ground. Boring reaming is a common processing
method in hole processing. Kangding also uses a large number of
boring processing in the processing of precision holes of moving
parts. Under the existing production conditions, Kangding has
summed up a set of titanium alloy finishing tool solutions through
continuous practice, which has realized the efficient production of
helicopter maneuvering parts.
Boring cutter is an indispensable tool in precision hole
processing. Precision boring can achieve high dimensional accuracy
and good surface roughness. Boring reaming is a common processing
method in hole processing. Kangding also uses a large number of
boring processing in the processing of precision holes of moving
parts. At present, the mainstream boring head uses the principle of
screw to adjust the tool diameter, and the structure is much the
same, so the positioning accuracy of the boring head in the process
of processing is very important. After many practices, Kangding
finally chose the A****2 boring head of Shangao brand. Its
fine-tuning accuracy (in the direction of diameter) can reach 2.5
m, and its high diameter accuracy can achieve IT5. It is a highly
rigid tool for the overall control of the geometry and surface
roughness of the hole (up to Ra 0.6). To ensure the rigidity of the
tool, the A****2 uses a cylinder and flange tool clamping design
for higher speeds, higher productivity, higher precision and better
surface finish. The precision-balanced A****2 allows for higher
speeds, improved hole geometry and reduced machine tool spindle
stress.
figure 2 A****2 Boring Head with Boring Bar has a ***0mm
Boring Cover and a larger dial.
The choice of insert has a direct impact on the machining of
titanium alloy holes. Excellent boring inserts maintain good
surface roughness and roundness over a wide range of cutting
parameters and effectively reduce the knives caused by deep hole
boring. To this end, Kang Ding in the trial cutting process for the
blade fillet, coating and different chipbreaker comparison test,
combined with the operator's experience, selected several blades
for process optimization (see Table 1). Among them, the CP**0 with
PVD coating has the toughness in stainless steel finishing and
semi-finishing.
Boring parameters (FS value).
Titanium alloy has poor thermal conductivity and the material is
sticky. Therefore, the cutting speed of the boring can not reach
the material of steel or aluminum alloy, generally maintained at
****5m/min to ensure the surface roughness is above Ra1.6. The Seco
blades used in the test showed good processing accuracy on the test
pieces. The coated CP**0 series inserts offer better wear
resistance and longevity, while the traditional *6G6 uncoated
inserts are more economical. Table 2 shows the test results for the
CP**0 blade.
Determination of feed rate
A suitable amount of feed can be used to machine parts in place
faster. In the processing of small diameter and large
length-diameter ratio precision holes, it is necessary to pay
attention to the occurrence of tool let-off phenomenon, and find
out the rules of tool deformation and surface roughness shaping on
the premise of stabilizing boring parameters. Taking a type of
connector as an example, the double-pronged ear hole (see Figure 3)
requires two holes with a diameter of Φ*8*0.**1 and a coaxiality of
0.*5mm. A boring tool with a suspension length of at least *2 mm is
required to complete the boring process once. A****2 hoe (see
Figure 4) with a *5mm cemented carbide mast. Under the premise of
rough to one side of about 0.2mm, the knife is fed according to
0.1mm, so that the amount of the knife is stable between 0.**2 and
0.**4. According to this rule, the operator can process the
connecting hole in place after 3 - 4 feeds, and ensure the
requirements of aperture and surface roughness.
| Country: |
China |
| Model No: |
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| FOB Price: |
0.5 ~ 1 / Piece (Negotiable)
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| Place of Origin: |
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| Price for Minimum Order: |
0.5 per Piece |
| Minimum Order Quantity: |
1000 Piece |
| Packaging Detail: |
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| Delivery Time: |
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| Supplying Ability: |
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| Payment Type: |
T/T, L/C, D/A, D/P, Western Union |
| Product Group : |
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