oil impregnated bronze bushings
Oil Impregnated Bushings Tolerances
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Oil Impregnated Bushings Made of tin bronze powder, pressed in mold and shaped after high-temperature sintering. It has fine and uniform pores, and forms an oily state after being vacuum impregnated with lubricating oil.
The bronze oil impregnation bushing process is cost effective in producing tight tolerance, final size parts with good part-to-part repeatability. Please contact us to discuss your specific part requirements. Properties：
- Self-lubricating
- Maintenance-free
- Easy to fit
- Suitable for high sliding speed
- Little bearing clearance
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Bronze Oil Impregnated Bushings, also called bronze bushings or bronze bearings, sintered bronze powder metal bushing! Oil-impregnated bronze bearings. Sintered, self-lubricating sliding bearings. Cylindrical bearings, flange bearing!
Huge bearings selection
The bearing is a natural sintered bearings product because of its controlled porosity and the resulting self-sufficient lubrication. The shaping of sintered bearings is basically determined by the tool design and manufacturing. The proper layout of the part geometry and the selection of the right material according to the sintered bronze bushing process have a great influence on the tool life and thus on the price of the part. Therefore, it is worth considering some design guidelines related to the sintering technology process.
Cast vs. Oil-Impregnated Bronze Bushings Shape
The process of copper oil impregnated bushings is not shape sensitive. Parts can have unique shapes or can be designed to combine two single parts into a complex one-piece copper oil impregnated bushing part. The combination of parts is limited to the design concept. Flanges A relatively small flange, step or overhang can usually be produced by machining a shelf or step into the mold. A flange that is too large can cause difficulty in ejection. The radius of the bottom flange edge and joint should be appropriate, and a shape that is uniform in size in the press direction is easiest to produce and eject from the press.
Cast vs. Oil-Impregnated Bronze Bushings
As a broader category, bronze bushings are favored for their longevity and pressure resistance, but there are still significant differences between cast bronze bushings and oil-impregnated bronze bushings. While similar in many ways, the manufacturing processes for these component types are completely different, and the processes themselves have different physical characteristics.
Our oil-impregnated bronze bushings are manufactured through a powder metal process, while the cast variety is produced through more traditional machining methods. It is important to understand how this difference affects the final product, as one type may be better suited to your application than the other.
We manufacture oil impregnated bronze bushings tailored to your needs.
Powder metallurgy oil bearing
It is made of tin bronze powder, pressed by mould and shaped after high temperature sintering, which has fine and evenly distributed pores and forms an oil-bearing state after vacuum impregnation by lubricating oil. The product has short-term non-oil lubrication, low cost of use！
Powder metallurgy oil bearing is a porous alloy product with lubricating oil impregnated in the pores. Therefore, the consumption of lubricating oil is low, and it can run for a long time without supplying lubricating oil from the outside, which is very suitable for the occasion of difficult oil supply and avoiding lubricating oil pollution. Compared with the general cast metal alloy bearings, the oil bearing does not need oil supply mechanism, so the design can be very simple. In addition, the tiny pores of the inner diameter sliding surface of the oil bearing will make “oil pressure leakage”, which will affect its load and increase the friction coefficient.
Powder metallurgy oil bearing according to the material can be divided into three categories: iron-based bronze iron bronze alloy.
The advantages of oil bearings.
- oil bearings than rolling bearing noise is small.
- small vibration.
- simple products.
- can omit processing operations, material saving, energy saving. 5.
- no need for special oil supply mechanism, no need to replenish lubricating oil from outside. 6.
- large freedom of shape design.
- can be made of several metals or metal and non-metal composite materials that cannot be made by general casting method, suitable for mass production and low price.
- can be made of porous metal materials.
Disadvantages of oil bearing:
- because it is a sliding bearing, so than rolling bearing friction coefficient is large
- because of the “oil pressure leakage”, so the PV value has a certain limit, not suitable for high load.
- due to the porous nature of the material, the strength is not as strong as the corresponding fusion casting material.
- High cost for small quantity production.
- When cutting and machining the inner diameter friction of the bearing, the porosity of the surface will deteriorate.
- the suitability should be fully tested before use.
Application of powder metallurgy oil bearing:
In summary of the characteristics of powder metallurgy oil-containing bearings, listed some practical columns:
- audio machinery cassette recorder (motor winch), light turntable, laser disk picture machine, VCR, VCR, digital recorder, dense audio, digital card recording and playback audio device, miniature laser record system and other audio equipment, etc. 2. household appliances washing machines, refrigerators, refrigerators, and so on.
- Household appliances Washing machines, refrigerators, timers, dryers, sewing machine motors, dehumidifiers, electric fans, heating machines, electronic lenses, extractors, juicers, motors for automatic camera lenses, motors for automatic focusing, air conditioners, hair dryers, shavers, battery operated sweepers, electric fans, stirrers, vacuum cleaners, camera roll film motors, brushes, and others.
- business machines: motors and bearings for printers and listers, motors and bearings for copiers, motors for disk machines, shaft fans, motors for portable alarm clocks, etc.
- Transportation equipment In automobiles, there are: wiper motors, electric window motors, rearview mirror motors, window washer motors, antenna motors, fan motors, sun visor motors, electric chair motors, belt guide motors, and height adjustment motors. Motorcycles include: starter motor, motor for cooling. Agricultural machinery, construction machinery, textile machinery.
Due to the improvement of powder metallurgy production technology and the development of high-tech materials in recent years, the application area of oil bearing has been partially extended to the application of rolling bearings.
Application of powder metallurgy oil bearing:
Powder metallurgy bearing oil bearing, is a tin bronze powder as raw material, after mold pressing, high temperature sintering after shaping, it has fine, uniform pores, by the lubricating oil vacuum impregnation to form an oil state. The product has a short-term non-oil lubrication, low cost of use, high accuracy of inner and outer diameter dimensions, adapt to the use of medium speed, low load capacity of the place.
Oil-impregnated bronze bushings Application：The product is used in micro motors, household appliances, power tools, textile machinery, chemical machinery, automotive industry and office equipment, etc. Oil-impregnated bronze bushings parameters
- Basic material: CuSn6Zn6Pb3 or CuSn10
- Bearing pressure: 35N/mm2
- Friction coefficient μ: 0.12~0.18
- Applicable temperature range: -80~160℃
Oil-impregnated bronze bushings manufacturer
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Oil-impregnated bronze bushings are characterized by their ability to self-lubricate. This effect is possible thanks to the powder metallurgy process. We are experts in bronzes, Oil-impregnated bronze bearings and Self-lubricating sliding bearings.
oil impregnated bronze bushings Sintered bronze bearings, Powder metallurgy bearing technology！
High sliding speed and maintenance-free
oil impregnated bronze bushings Sintered bronze bearings are characterized by their self-lubrication and maintenance-free nature. Sintered bronze bearings are made of porous bronze or iron and are usually filled with oil. Their high allowable sliding speeds make these sintered bronze bearings ideal for rotating applications.
If you want a quote, wish to place an order or have questions about our bearing bushing products – do not hesitate to contact us and we will help you.
The powder particles in the parts are then bonded together in the furnace. The temperature of the furnace is just high enough to bond the particles without melting the metal.
This sintering procedure is the key to oil immersion. Essentially, sintering reduces the porosity of the product as it binds the powder particles together, but it is possible to control the extent to which this occurs.
For oil-impregnated bronze bearings, the final porosity is maintained at around 25%, which means there are still tiny, interconnected capillaries throughout the material.
To complete the manufacturing process, the bushings are pressed to the required tolerances with a set of calibration tools. The bushings are then vacuum impregnated to force oil into the interconnected pores.
Oil impregnated bushings Advantages and applications
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Powder metallurgy was originally developed as a cost effective alternative to standard processing and remains an extremely economical option. In most cases, it is one of the most efficient methods for high-volume production, which translates into cost savings at the consumer end. Oil immersion also eliminates the need for lubricants and frequent maintenance. Oil impregnated bushings have their origins in automotive components, however they are used in many other industries. In general, our oil-impregnated bronze bushings are best suited for low to moderate loads, but they do withstand high speed loads better than many alternatives. They also perform well over a wide temperature range of approximately 10-220°F, which means they are suitable for use in outdoor and industrial environments.
Cast Bronze Solid Bushings Advantages and Applications
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Cast bronze bushings do not start out as a powder, so they are able to maintain a finer grain structure and therefore have higher strength. In general, cast bronze bushings are also stronger, more durable and more reliable under compression forces. This combination of properties makes cast bushings ideal for applications involving heavier loads. A sintered bronze bushing of comparable size simply cannot withstand the same forces as a cast bushing.
Unlike oil-impregnated bushings, cast bronze bushings are not formed from powder. Instead, they are formed from solid or hollow cast bronze bars that undergo a machining process designed to achieve a precise final shape. First, the bronze is cast continuously or centrifugally into a solid or hollow bar. Most modern manufacturers use CNC lathes to cut the cast bars to their final dimensions, although other machining techniques may be used to form or finish the bushings.
Oil impregnated bushings wall thickness
In general, Oil impregnated bushings wall thickness should not be thinner than 0.060 inch (1.52 mm) and the length to wall thickness ratio should be less than 8:1 to ensure the strength of the tool and to avoid designing long, thin walls; they need to be When the length to wall thickness ratio is as high as 8:1 or higher, special length to diameter and or length to wall thickness ratios The lower it is, the easier it is to achieve uniform filling, and variations in density are unavoidable. The lower the ratio of length to diameter and or length to wall thickness, the easier it is to maintain a uniform density across the part.
Lubrication of oil-impregnated bronze bushings
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Most sintered bronze bearings are oil-filled. When storing and mounting sintered bronze bearings, they must not be allowed to come into contact with absorbent materials that could extract oil from the bearings. Under normal conditions, it is not necessary to add additional lubrication.
sintered iron powder bushing
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Material: Fe, Iron-based powder metallurgy product, powder metallurgy bearings.
Powder metallurgy (PM) is a term covering a wide range of ways in which materials or components are made from metal powders.
Powder metallurgy
Powder metallurgy is the process of blending fine powdered materials, pressing them into a desired shape or form (compacting), and then heating the compressed material in a controlled atmosphere to bond the material (sintering). The powder metallurgy process generally consists of four basic steps: powder manufacture, powder blending, compacting, and sintering. Compacting is generally performed at room temperature, and the elevated-temperature process of sintering is usually conducted at atmospheric pressure. Optional secondary processing often follows to obtain special properties or enhanced precision. The use of powder metal technology bypasses the need to manufacture the resulting products by metal removal processes, thereby reducing costs.Powder metallurgy is also used in “3D printing” of metals. See selective laser melting and selective laser sintering.
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Oil impregnated bronze bushings Material
Most of the oil-impregnated bronze bushings offered by bronzelube are made of bronze or similar materials and have a mineral oil impregnation of 18% to 20%. We can also supply sintered iron or bronze bearings with MoS2. When bearings are machined, be sure to ask us for instructions. This is necessary because the pores can become clogged.
Specification overview of oil impregnated bronze bushings
sintered bronze bearings data:
| Specification overview | |||
|---|---|---|---|
| Properties | Sintered bronze | Sintered iron | MoS2 |
| Max. load (Dyn/stat), N/mm2 | 10 / 50 | 9,5 / 50 | 2,5 / 50 |
| Max. sliding speed m/s | 5 | 5 | 0.25 |
| Max. PV value N/mm2 x m/s | 1.6 | 1.6 | 0.4 |
| Temperature range, oC | -10 / +90 | -10 / +90 | -50 / +300 |
| Shaft tolerance | See brochure | See brochure | See brochure |
| Housing tolerance | H7 | H7 | H7 |
| Shaft roughness | Ra < 0.8 | Ra < 0.8 | Ra < 0.8 |
| Shaft hardness | HB > 220 | HB > 220 | HB > 220 |
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