Plastic
sleeve specifications: POM polyformaldehyde plastic sleeve, PA nylon
plastic sleeve, PTFE PTFE plastic sleeve, Teflon plastic sleeve, Teflon
plastic sleeve. Characteristics
of plastic bushings: acid, alkali, corrosion, mechanical strength, good
wear resistance, heat resistance, oil resistance and chemical
resistance. Plastic sleeves are made of PTFE/Teflon bimetallic bearing Long/Teflon/PTFE, Polyoxymethylene POM, Nylon PA, Polypropylene PP. Products for aerospace, automotive, sensors, medical, pharmaceutical,
satellite, valves, pumps, sanitary, electronics, bearings, electrical
appliances, and other industries.
Bi-metal bushing part material is a patented product and is a new material for profiled and standardized bushing products. Mainly
for the various shaft sleeve processing companies and general machinery
factories and machinery repair and other companies, to provide bimetal
sleeve parts near-net shape material (Near Net Shape Material). With
this bimetal bushing part-shaped material, only a very small amount of
machining of the bushing (such as chamfering, drilling, car or oil tank)
can be used as a bushing product for direct installation. Its technical features are described below:
1. There are two types of existing steel-copper alloy bimetal bushings, industrial batch making and bushing processes:
1.1. Casting copper alloy round shaft sleeve on the inner wall of seamless steel pipe
Casting
copper alloy round shaft sleeves on the inner wall of the seamless
steel pipe has more manufacturing and usage in Europe. The rigidity,
strength and other mechanical properties of the parts are better. The
disadvantages are complex production process, large material waste, and
high manufacturing cost. .
1.2. Cold-rolled steel-sintered copper alloys into sleeves for bi-metal sheet rolling
The bushes rolled with this bimetal plate are more productive than the bushings and are now used more often. However,
the production equipment used in the manufacture of bimetallic plates
is still relatively large, the process flow is long, the area is large,
and the energy consumption is large. When the roll is made into a shaft
sleeve blank, the material must also be cut, pre-bent, rolled , Shaping and other processes, this still consumes material, time,
mold, increase the processing cycle and product production costs,
generally require a certain scale.
There are two drawbacks to this type of roll-up technology:
(1) The copper alloy sintered on the bimetal plate is generally
cold-rolled with a rolling mill. Its relative density is ≤ 97% and it
cannot be used as a high-performance part;
(2) Whether the sleeve is rolled or not, whether it is butt or lap
joint, has a seam, which makes the shaft sleeve maintain poor accuracy.
Both of these problems directly affect the mechanical properties and
performance of the sleeve.
2. Bushings made of bimetal bushing parts (patented products)
2.1 Manufacturing process of bimetallic sleeve parts
In
order to overcome the above two types of three: (two types: casting
type, sintering type; three types: casting round sleeve, rolling butt
sleeve, rolling buckle sleeve.) Insufficient to improve the mechanical
technology of the sleeve Performance,
saving metal materials, especially saving non-ferrous metal materials,
saving manufacturing processes, saving material manufacturing equipment,
tooling molds and machine tools that save sleeve machining, the present
invention adopts the method of sintering copper alloy on the inner wall
of seamless steel pipe, adopting The
radial pendulum twister compacts the copper alloy lining on the
sintering to ≥98%, which meets the performance requirements of
mechanical structural parts. The first production method of manufacturing steel-sintering copper
alloy round-round bi-metal bushing parts production technology -
"sintering pendulum method."
2. The technical characteristics of "sintering pendulum method":
The
characteristics of the bimetal bushing part material produced by this
process are as follows: (1) The structure is full circle, good rigidity,
good maintenance accuracy, and easy to realize automatic assembly on
the automatic production line; (2) High production efficiency (complete
one shaft The
average work time is 4 seconds, and the number of processing steps is
less. It eliminates the use of conventional sintered bimetals, cutting
and rolling of the necessary molds and equipment used in the reeling
process. It requires less equipment and requires only two sets of major
equipment. ,
Small footprint; (see the comparison table) (3), high material
utilization, production according to the required specifications, the
utilization rate of steel and copper alloy is close to 100%, saving
materials, energy saving, and low manufacturing cost. (4) The use of this type of bimetal bushing part-shaped material
requires only a very small amount of machining (such as chamfering,
drilling, car or oil tank) to make bushing products for direct
installation.
Double ball bearings are relatively high-grade bearings. There are several tiny steel balls around the axis of the bearing. When the fan page or axis rotates, the steel ball rotates. Because they are all spheres, friction is low and there is no problem of oil leakage. The
advantages of the double ball-bearing fan are its long life,
approximately 50,000 to 100,000 hours; it has good anti-aging
performance and is suitable for fans with higher speeds. The
disadvantage of double ball bearings is the high manufacturing cost and
the highest noise at the same speed level (because the ball bearing
friction points increase by a factor of 2). Double ball bearings and hydraulic bearings have better sealing properties, especially double ball bearings. Double ball bearings are embedded entirely in the fan, and the rotating part is not in direct contact with the outside world. In a sealed environment, the bearing's working environment is relatively stable. As a result, double-bearing bearings are used in almost all 5000-degree-diameter, large-diameter fans. Since the hydraulic bearing has a unique return-to-oil circuit, the possibility of oil leakage is small.
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