Sintered Rings

Tiny things can do a great job

 Samdo Sintered Rings (SSR)
In recent years we have made great efforts in the development of self-lubricating sintered rings and have successfully established the production basis, including special materials and processes. Samdo Powder Metallurgy Co., which has mainly produced various kinds of automotive parts by powder metallurgy technology since 1987, has become one of the world's leading specialists in the production of sintered rings.
Samdo Sintered Rings (SSR) are made in a variety of material grades and designs for spinning and twisting various kinds of fibers in order to meet the demand for good quality yarns and highly efficient production.

Types of Standard Samdo Rings

Vertical Type
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Conical Type
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Specifications of Standard Samdo Rings

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SSR material and its function
Sintered material can be made from a mixture of varied metallic powders compacted under high pressure to get an optimum density and is sintered in a sintering furnace. Sintering bonds the metal particles together into a structure of interconnected pores to give the desired porosity and to act as a permanent oil reservoir.
The sintered material can then be machined into any ring shape and heat treated to the hardness of steel; yet, it is naturally not as solid due to its porous structure. The ring then acts as an oil-retaining bearing from which the traveler draws oil by automatic capillary action as it rotates. Thus the ring absorbs and releases oil like a sponge. The traveler uses the oil wherever and whenever it is required without waste or the risk of yarn contamination.

Advantages of SSR
While a wick-fed steel ring offers satisfactory but localized lubrication, the SSR has the efficiency of a totally lubricated bearing, even where an auxiliary wick is not fitted. Such complete lubrication brings with it many advantages:

In addition to these technical advantages, in many cases SSR are now getting closer in price as compared to steel equivalents, as well as being far more efficient.

Manufacturing procedure

SSR are formed from various sizes of raw material blanks, which are then machines to suit the requirements of each individual customer.  Therefore, rings cannot be stocked.  Once turned, they undergo critically controlled heat treatment and polishing processes before final inspection and dispatch.
Considerable skill is required to machine sintered metal without closing its pores.   The material is also very fragile and distorted in shape when undergoing heat treatment.  These dangers are even more pronounced when materials having large diameters with shallow depths and narrow sections are processed.  Our in-house expertise in the processing of SSR materials has enabled us to minimize these difficulties. 

How to choose SSR for type and application
How to handle SSR

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