INFO
Shaft sleeve refers to the sleeve on the propeller shaft or stern shaft. The bearing is a part which can fix and reduce the friction coefficient of load
during the mechanical transmission.
The same thing between the sleeve and the bearing is that both bear the load of the shaft.
The difference between the two is that the sleeve is of the overall structure, and the relative movement between the shaft and the sleeve is the
rotation; the bearing is split type, and the rotation is the relative movement of the inner and outer rings of the bearing. But in essence, the sleeve is actually a kind of sliding bearing.
The bearing bush is equivalent to the outer ring of the sliding bearing. The sleeve is integral and the relative shaft is moving. Some of the bearing shells are split and the relative shaft is rotating.
In LEGO mindstores and biotrans rosys series robot components, the shaft sleeve refers to the LEGO standard axle holder in silver gray, which is divided into two types: full shaft sleeve and 1 / 2 shaft sleeve.
MAINTENANCE
Common fault causes
During the long-term operation of the sleeve, the surface of the journal is subjected to the extrusion pressure of the expanding sleeve and the combined mechanical force, which will cause permanent deformation, diameter or reduction of 0.1mm-0.3mm. The mechanical expansion and tightening force can not meet the required tightening force, and the clearance between the sleeve and the spindle appears, which causes the wear of the sleeve.
Latest repair methods
Because of the high value of components and the expensive traditional repair methods, with the development of advanced technologies such as polymer composites abroad, some repair methods with high speed and low cost are favored. This method is also introduced in China, and the mature material of youfushi blue 2211f is also introduced. The material has the comprehensive mechanical properties, excellent adhesion and temperature resistance and corrosion resistance which can not be compared with the traditional methods. The maximum compressive strength can reach 1200kg/cm2, and the adhesion (overlapping shear tensile test) is 225 kg/cm2 on the smooth steel surface. So it can be used for repairing the wear of large shaft sleeve. And the equipment does not need to be disassembled in a large range, which saves a lot of manpower and material resources for the enterprise.
PROCESSING TECHNOLOGY
Process analysis of parts
(1) Part material: 45 steel. The cutting and processing properties are good.
(2) The surface of parts: outer circle surface (Φ 50, 35, 33), inner surface (Φ 31.5, 20.5), type hole, two end surfaces, inner and outer step surfaces, inner and outer undercut grooves, internal and external chamfering.
(3) Main surface analysis: the Φ 20.5 inner hole is not only the supporting surface of other parts, but also the main reference plane of the part; the outer circle of Φ 50 and its step surface are also used to support other parts.
(4) Main technical conditions: the coaxiality of the outer circle of Φ 50 and the inner hole of Φ 20.5 is controlled within 0.03mm; the verticality of the step surface and the Φ 20.5 inner hole is controlled in mm; the dimension tolerance of the inner hole itself is mm; the roughness is Ra0.8 μ m; the hardness of the parts heat treatment is hrc50-55.
Part manufacturing process design
(1) Blank selection: according to the 45 steel part material, the production type is medium batch production, the diameter and dimension of parts are different, the parts are thin, low rigidity, easy to deformation, high machining accuracy requirements, parts need to be quenched and other factors, and the selection between the bar and die forging is made: die forging.
(2) Benchmark analysis: the main positioning datum shall be Φ 20.5 inner hole center
(3) Installation scheme: when machining large end and inner hole, three claw chuck can be directly used for clamping; for rough machining small end, reverse claw clamp can be used for large end, and for semi precision and finishing small end, mandrel shall be provided to locate axial clamping workpiece with Φ 20.5 hole. When machining the type hole, the indexing head can be used to install, lift the spindle 90 ° and use the direct indexing method to ensure the equal position of 3 × Φ 6 on the part circumference. The four screws through the holes at the big end are installed with special clamps: the large end face and Φ 20.5 hole are used as the main positioning reference, the type hole is anti rotation and the workpiece is clamped axially.
(4) Surface processing method of parts: Φ 20.5 inner hole, which adopts fine grinding to meet the requirements of precision and roughness; outer circle and its step surface are grinded; other rotating surfaces meet machining requirements by semi precision turning; and the type hole is on vertical milling.
(5) Heat treatment arrangement: because of the hard skin on the surface of die forging, the tool wear and passivation will be accelerated. In order to improve the machinability, the blank will be annealed after die forging to soften the hard skin; the parts The final treatment is quenching. Because of the small wall thickness of parts, it is easy to deform, and the machining accuracy of parts is high. In order to control the quenching deformation as much as possible, the quenching treatment is arranged after rough machining for pretreatment.
INSPECTION RULES
1. The surface of the appearance quality sample shall be free of bubbles, burr, deformation, uniform material and no irritating smell.
2. Dimensions
(1) The relevant dimensions shall be tested with vernier caliper in accordance with relevant technical and drawing requirements.
(2) After the shaft sleeve and the rotating shaft are matched, the rotor is vertical downward, and the sleeve will not slide freely under the action of
self weight.
3. Heat resistance and aging test
(1) After 125 ºC /1h ball pressure test, the indentation should be no more than 2mm, and no deformation was observed visually.
(2) After the sample was put into the oven for 120 ºC /96 hours, the shaft sleeve was visually free of embrittlement and deformation.
4. Combustion resistance test
The flame retardant grade is VW-1, and it should be extinguished within 15s after burning with alcohol lamp for 15s.
5. Packaging and marking
(1) The packaging shall be firm, reliable and safe, and ensure that the products are not damaged during transportation.
(2) The package shall be marked with supplier code and name, product name, product quantity, material code, quality inspection mark, production
date, etc. the identification shall be clear and accurate, and there shall be no mixed loading.
(3) In order to increase the traceability of the product, the production batch number should be marked at the conspicuous place of the outer
packaging. The supply batch number shall be indicated on the product inspection certificate or the original record of inspection (test).
6. Hazardous substance content (RoHS directive)
If used for RoHS directive models, the materials shall meet ROHS directive requirements.
WHY CHOOSE US
1. Reliable Quality Assurance System
2. Cutting-Edge Computer-Controlled CNC Machines
3. Bespoke Solutions from Highly Experienced Specialists
4. Customization and OEM Available for Specific Application
5. Extensive Inventory of Spare Parts and Accessories
6. Well-Developed Worldwide Marketing Network
7. Efficient After-Sale Service System
The 219 sets of advanced automatic production equipment provide guarantees for high product quality. The 167 engineers and technicians with senior professional titles can design and develop products to meet the exact demands of customers, and OEM customizations are also available with us. Our sound global service network can provide customers with timely after-sales technical services.
We are not just a manufacturer and supplier, but also an industry consultant. We work pro-actively with you to offer expert advice and product recommendations in order to end up with a most cost effective product available for your specific application. The clients we serve worldwide range from end users to distributors and OEMs. Our OEM replacements can be substituted wherever necessary and suitable for both repair and new assemblies.
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