Category Archive: Services & Capabilities

Which Industries Use Cold Rolled Steel and Cold Drawn Steel?

Cold rolled steel and cold drawn steel refer to two separate processes used to cold form steel into shapes.  Although both processes are accomplished at room temperature, the attributes of the resultant product of these two processes tend to serve different industrial applications.

The Difference Between Cold Rolled and Cold Drawn Steel

Although these two steel shaping processes involve forming the steel at room temperature, the forming mechanism is different.

Cold rolling is a process in which the steel is passed through a roll and in many instances a series of rolls to form the steel by flattening and spreading it.  The flattening process imparts cold work stresses in the steel resulting in improved mechanical properties. Cold rolling also imparts improved surface finishes but maintaining tight dimensional control can be challenging.

Cold drawing is a process in which the steel is pulled through one or more dies to reduce the cross sectional are, flowing material linearly.  It is the reduction in cross sectional area from that going into to the die from that exiting the die that imparts cold work stresses resulting in improved mechanical properties.  Dimensional control is the strong point of cold drawing because the steel is forced under pressure to completely fill the shape of the hole cut into the die.  It should be noted that in general, the surface finish of cold drawn steel is not as smooth as that of cold rolled.

Applications of Cold Rolled Steel in Industry

Cold rolled steel supplied in flat stock, strip and sheet, supports a wide range of industrial applications ranging from automotive, home appliance, furniture and industrial building.

Cold rolled round bar and coil stock is used extensively for machining and heading of finished parts supporting automotive and a great number of other industrial applications.

To a lesser extent, cold rolled steel produced by using shaped rolls is used to form profile configurations.  Near net shape cold rolled profiles reduce the amount of machining required to produce a finished part.  In some instances when the finished part does not require sharp angles and demanding tolerances, a net shaped cold rolled profile can be used.

Industrial applications that have benefited by using near net and net shaped cold rolled steel profiles include:

  • Power Generation applications such as turbine buckets, seal strip, vanes, and key bars.
  • Automotive applications such as exhaust, boss mounts and door hinges.
  • Linear Motion applications such as rails,carriages, telescoping slides
  • Bearing applications such as bearing cages.

Applications for Cold Drawn Steel in Industry

Cold drawn steel is primarily provided in bar, coil, and wire form ranging from rounds, squares, rectangles and hexes. The cold drawn process capability to hold tighter tolerances than that of cold rolled tends to make this a product of choice for more demanding machining operations and applications.  Cold drawn steel products are used in production of machined parts, automotive motor parts, shafting, and fabricated structural units.

Cold drawn steel, like cold rolled steel, is also provided in near net and net shaped profiles.  The key differences are that the cold draw process is capable of producing more complex profile configurations with sharper corners and greater predictable dimensional uniformity than that of cold rolled steel.

Industrial applications that have benefited by using near net and net shaped cold drawn steel profiles include:

  • Linear Motion Control applications ranging from linear rails and carriages, telescoping slides, and solenoid plungers.
  • Firearm applications including but not limited to barrels, slides, cocking hammers, sears, to gas blocks.
  • Medical applications for parts used in surgical devices and implants.
  • Automotive applications for parts used in fuel injection and exhaust system, seats, and one way clutches.
  • Agriculture Power Transmission applications including gears and splined shafts.

 

Cold Forming Services from Rathbone Precision Metals

At Rathbone Precision Metals, we offer cold drawn and cold rolled services for almost any industry. Our highly precise metal profiles can be manufactured within tight dimensional tolerances to meet the most demanding specifications in nearly any industry.

To learn more about our cold forming techniques and how they can benefit your industrial application, contact us or request a quote.

 

Profiles Made with Gear Drawing

At Rathbone Precision Metals Inc., we specialize in cold drawn gears – in particular, gear and spline, and rack and pinion cold drawing. Cold drawing involves the precision extrusion of preformed metal shapes at room temperatures through a die or a series of dies. This process allows us to produce cleanly finished products within extremely tight tolerances. Our cold drawn gears also benefit from improved dimensional consistency and straightness, as well as enhanced overall strength due to strain hardening.

What Types of Profiles for Gears Can Rathbone Precision Metals Draw?

Since 1905, Rathbone Precision Metals Inc. has built a solid reputation as a leading manufacturer of cold drawn gears and other machining components for a variety of industries. During more than 100 years of operation, we have custom drawn countless gear profiles containing unique tooth configurations for the automotive industry. Using a variety of metal alloy compositions, we can produce parts and components within tolerances up to ± 0.002 inches. Furthermore, cold drawing gives us greater control of corners, allowing for precise fillet radii to ± 0.005 inches.

We can also cold draw gears for use in heavy equipment and machinery, which often require the production of gears with asymmetrical profiles. The smooth finishes obtained by our processes eliminate the need for secondary milling process such as hobbing, resulting in cost savings that are passed on to our customers.

In addition to the cold drawing of gears, splines, and pinions, Rathbone Precision Metals Inc. also specializes in the cold rolled manufacturing of various mechanical components from a range of metals and alloys including carbon steel, stainless steel, nickel alloys, and copper alloys.

The Process of Gear and Pinion Drawing

Cold drawing is done by pulling or extruding new, hot rolled shapes through one or more precision dies. As the material passes through the die, it is compressed into the shape of the die. This forceful change of shape readjusts and strengthens the crystalline structure of the metal due to a process known as strain hardening.

Because cold drawing is done at near-room temperatures, the finished products do not undergo cooling and shrinkage processes (as in hot drawn and hot rolled methods) which tend to alter the overall final dimensions. This characteristic makes cold drawing ideal for producing components (such as gears) that require high levels of dimensional accuracy and precision with exacting tolerances. Cold drawn methods are also cost-effective for both low and high production volumes.

Learn More

Rathbone Precision Metals Inc.’s cold drawn products offer numerous advantages over gears produced by other methods. If you would like to know more about our gear drawing solutions and processes, feel free to contact us or request a quote.