Steel Industry


Table Rolls for Cold Strip

Table Roll

Table rolls with cast polyamide roll bodies are assembled on a straightened and machined steel shaft with ball bearings sealed in plastic end caps. The shaft and OD are finished to customers specification for easy exchange in existing equipment. Table rolls up to 45" length use two ball bearings. Up to the maximum length of 96", a center bearing is added to assure vibration-free rotation. All rolls are test-run for free idling before shipment.

Coupling & Slippers for Universal Spindles:

Timco supplies complete spindles and couplings, and all parts which are designed to absorb the wear which is caused by torque load, rotation, and misalignment.

A. Spindle Slippers
Spindle Usually made of cast polyamide with or without lubricating oil, the slippers offer very long service life. They are lightweight for easy installation: a 25" long slipper for a strip mill coupling weighs only 16-1/2 Ibs. Their high modulus of elasticity also dampens noise and vibration.
B. Block for Pin
The bushing which holds the pin is frequently starved of lubricant due to centrifugal force action. Timco uses and oil impregnated material (cast polyamide + Oil/PA 6G + Oil) for this part, and pays special attention to the profile and pattern of the oil grooves.
C. Coupling Wear Liners
These plates, which transfer the torque from a coupling box to the spade of a roll are difficult to design and more difficult to maintain. Timco selects polyamides or duroplastics of highest load bearing capacities for these parts. Damage to the spade end is eliminated and replacement is simplified.

Special Components for Coupling Spindles

Coupling Box
D. Tapered Sleeves
A specialty in coupling engineering: The tapered sleeve, made of a duroplastic material, carries the full operating torque load. But it "lets go" under overload thus protecting valuable, precision, ground drive components.
E. Spindle Support Bearings
Who can still afford babbitt or bronze or brass bearings in a spindle support? Water-lubricated fiber bearings with separate thrust collars cradle the heaviest spindle safely, with little or no maintenance, if they are designed correctly by Timco.

Wobbler Boxes-Coupling Boxes Coupling with Inserts

For roll rebar, fence post, mine roof bolts, and light structural shapes, manufacturers do not need space-age equipment. The manufacturer should choose equipment which offers pay- back within the short-term forseeable future, can be installed at low cost, and efficiently utilized in rolling the product:

A. Forged Steel Coupling Boxes with Replaceable inserts
Extreme torque loads, even in rail and structural mills, can be transferred by couplings with replaceable plastic inserts.These couplings eliminate damage to pinion ends, roll-ends and spindle-ends.  Coupling noise is reduced to <80 DCBL when the mill is idling and they are very economical. Only the wearing parts of the coupling are replaced as needed, with cast polyamide or duroplastic inserts which are kept in stock at Timco's warehouse.
B. Spacer "WOODS", Not made of wood
When a 12" mill coupling box is allowed to slip one inch off the roll wobbler end due to poorly cut or worn spacer woods, torque-transmitting surface is reduced by 25%. Spacer woods made of cast polyamide guarantee precise positioning of the coupling box.

Water - Lubricated Fiber Bearings

The modern approach to use antifriction bearings through all sections of a rolling mill contradicts the modern requirement that all designs must be cost-efficient. Where bar must be rolled to within .008", the cost of water-lubricated fiber bearings beats antifriction bearings with ease. All Timco's fiber bearings are made of compression molded cotton fabric, either shredded, or in straight layers, saturated with synthetic resin. Additives such as MoS2 or graphite are available. Timco also offers the complete engineering for re-designing of bearing chocks and of water inlets.

A. Block Bearings (with collar)
A block bearing which incorporates the thrust collar can be mounted and replaced in the mill stand with the least effort and loss of production time verses seperate bearings and thrust collars. Low-cost filler material may be used in the base part of the block bearing in order to reduce cost. Timco has a large number of molds available for this type of bearing.
B. Bearing Shells
Most commonly used is a combination of separate bearing shells and thrust collars. The bearing shells are of carefully layered fabric, usually covering an arc of 120 degree, with large inlet chamfers on each side to allow good cooling and lubrication with water. Very large bearing shells for plate, slabbing, or blooming mills are usually made in segments.
C. Thrust Collars
The greatly varying shapes of thrust collars are almost always machined from compression-molded plate. This reduces tooling cost while producing a precise part of high quality.

Filler Plates

Filler Plate

They are called lagging, risers, filler plates, segments, liners, and you may use any material from wood to magnesium. These plates, which temporarily increase the outer diameter of a pay-off or rewind mandrel, should have a perfectly smooth outer diameter, should weigh next to nothing, should outlast everything, and be low cost.

Of all available materials, cast polyamide comes closest to meeting such diverse demands. 

Timco supplies filler plates for both pay-off and recoil mandrels.  The material is carefully machined to precise radii and mating sides; all corners are smooth and rounded. The density of cast polyamide is 1.15: one 67" long plate from a set of four 2" thick plates for a 16" payoff reel weighs only 78 Ibs per plate. No crane is needed to install and remove it. And yet, slit coils with burrs can be pushed off without coil car, without appreciably shortening the service life of the plates.

Timco supplies filler plates within the following ranges:

Filler Plate Drawing

Up to 1/4" thick plate is being recoiled over Timco filler plates which are bolted to the mandrel segments.

Wear Plates, Liners, Thrust Rings, Bushings

Sometimes, one has no other choice but to use hardened steel plates facing hardened steel plates to absorb wearing friction, particularly in a hot environment. One should, however, always try to mate a softer, wearing material of low cost with the steel part. Timco uses PA, PBTB, POM, UHMW-HD PE, PU, or duro plastics for wear plates. Each plastic offers a different load rating, coefficient of friction, moisture absorption and thermal expansion rate. Noise is always greatly reduced.

Application details must be discussed in order to assure good results. It's worth the effort: At a lower price, PA liners (with oil) far outlast the previously used bronze liners!

There is no limit to the possible applications for plastic wear liners and related parts:

Thrust collars

Thrust Collar

Cast polyamide thrust collars are used for both hot and cold rolling mill applications. Timco can manufacture thrust collars up to 39" OD from our standard sized tubes. Larger sizes are available upon request. All thrust collars are machined from tubing to create a concentric ID and OD. Cast polyamide is 1/7th the weight of steel and causes less back problems for roll shop personnel due to the amount of roll changes done per day in a typical steel mill. Thrust collars are assembled with standard hinge hardware available from any supply store. Timco supplies various locking mechanisms such as socket head cap screws, toggle bolts, and mechanical latches.

Timco specializes in parts which must bear heavy loads. New parts are discussed and designed at all times: Your specific inquiry is always welcome.

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Tel: (914) 736-0206 | Fax: (914) 736-0395
Email: sales@Timco-eng.com
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