Slewing bearing is a rotational rolling-element bearing that typically supports a heavy but slow-turning or slow-oscillating load, often a horizontal platform such as a conventional crane, a swing yarder, or the wind-facing platform of a horizontal-axis windmill.
Compared to other rolling-element bearings, slewing bearings are thin in section and are often made in diameters of a metre or more; the slewing bearings on the Falkirk Wheel are 4 metres diameter and fit over a 3.5 metre axle. Slewing bearings resemble oversize aircraft control surface bearings.
Slewing bearings often use two rows of rolling elements. They often use three race elements, such as an inner ring and two outer ring "halves" that clamp together axially.
Slewing bearings are often made with gear teeth integral with the inner or outer race, used to drive the platform relative to the base.
As for other bearings that reciprocate, rather than rotating continuously, lubrication can be difficult. The oil wedge built up in a continuously rotating bearing is disrupted by the stop start motion of slewing. Instead, a hydrostatic bearing with pumped oil flow may be used.
Material |
42CrMo,50Mn,42SiMn,Steel45,5CrMnMo,45Mn |
Diameter |
From 100mm to 7800mm |
Hardness with Tempering(HB) |
229-269HB |
Hardness with Normalizing(HB) |
187-241HB |
Surface Hardness(HRC) |
55-62HRC |
MOQ |
1 PC |
Certification |
BV, CCS, ABS, DNV, GL, BV |
Lead Time |
15-35 days |
Application:New energy,Metallurgical,Play Equipment,Airport equipment,Military,Robot,Medical Machine,Environment ,protection equipment,Parking Equipment,Transporter,Wind Power,Crane
Component:
Component Name |
Type |
Material |
Rolling Element |
Ball and roller |
GCr15
GCr15SiMn |
Seal |
|
Oil resistant rubber
Buna-N rubber |
Fixed retainers |
integral type
sectional type
separate unit |
Steel20
ZL102cast aluminium alloy
Polyamide 1010 resin |
Main Equipment:
Equipment |
Qty |
Capacity |
(PCS) |
(mm) |
Crown Block |
15 |
ALL |
Vertical Lathe |
7 |
2000-6500 |
Vertical Lathe |
3 |
Max2.5M |
Vertical Lathe |
5 |
500-1500 |
Horizontal lathe |
2 |
630 |
CNC Horizontal lathe |
2 |
630 |
Grinder |
5 |
500 |
Vertical Grinder |
4 |
750 |
Grinder |
4 |
3000 |
Quenching Machine |
5 |
ALL |
Gear Hobbing Machine |
4 |
max800 |
4 |
max3150 |
2 |
max2000 |
2 |
max1500 |
Gear Shaper |
5 |
1000-1200 |
3 |
1800 |
CNC Drilling Machine |
2 |
ALL |
Drilling Machine |
5 |
max1600 |
Drilling Machine |
5 |
max6300 |
Heat Treatment Furnace |
2 |
ALL |
Packing:
Step1- Antirust oil for surface treatment, Step2- Be wrapped with plastic cloth wrapped, Step3- then be wrapped with kraft paper, Step4- Be wrapped with another plastic cloth again. Step5- Be packed with plywood case.
Quality Control:
Product inspection are in house, there are 53 QC and QA persons in factory.
During produce, the operation workers inspect product for each process according to drawing at first, and then QC person inspect each process and product again and keep record accordingly.
To do clearance test for each finished bearing.
To process dimension and clearance test according to inspection record by final QC.
Slewing bearing appearance is inspected again before packing.
Quality control Documents including:
Quality Control Process Chart
Forging blank certification (UT, Heat treatment, Chemical composition, size)
Production Schedule
Forging blank inspection report
Final production inspection report
Hardness test report
Ultrasonic test report
Magnaflux test report
Clearance Test
Product process inspection report
Inspector working record
We can provide customer final inspection reports as following:
Certification of quality
Using instruction of slewing bearing
Chemical composition report
UT report of rolling element
Certification of Heat treatment
Final inspection report
Any other report if required.