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Cold Formed/Forged Products Overview

Home > Cold Formed/Forged Products
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Founded in 1929, Grob Inc. is a family-owned and operated company that has innovated industrial cold forming by developing the “Grob Rolling” method. This technique allows us to create quality cold formed products that provide customers numerous advantages over traditional hobbing, including higher strength, more durability, and a better surface finish.

 

Grob Inc. supplies a variety of cold formed products, including spline shafts, standard and custom timing belt pulleys, flanged bushings, broached sleeves, heat exchanger tubes and drums, and spur gears.We engineer excellence into every cold formed product, delivering stronger and more economical parts to end users. Learn more about the Grob Cold Rolling method, our cold formed products, the benefits of our cold forming process, and the custom machining services we offer.

The Grob Rolling Process

Originating in the 1950s as an alternative to hobbing (removing material by cutting), the Grob Rolling process displaces raw material to create a desired tooth shape, leaving little to no waste. The Grob Rolling process increases the strength of the material by creating a tighter grain structure over the entire tooth profile. The biggest strength gain is near the root area or bottom of the form, where it is typically the most crucial.

When using Grob Rolling, a severe reverse flow occurs where the groove forms down between the teeth. The displaced raw material must be the same as the area from where it originated. This cold forming process allows us to form even and uneven numbers of teeth with symmetrical patterns on cylindrical blanks. We can also form tubular blanks over grooved mandrels, creating internal corrugation of the blank while cold forming the external shape.

Suitable Metals for Cold Forming

The high-speed process of cold forming enables the manufacturing of large amounts of metal-based products in a quick, cost-effective, and consistent manner. Cold formed products have a superior surface finish, generate a greater yield, and feature higher tensile strength and hardness than products manufactured using heat forming.

While some materials, such as cast iron, are too brittle for the cold forming process, there is a variety of suitable materials, some of which include:

  • Aluminum (2024, 6061)
  • Stainless Steel (316, 416, 17-4)
  • Most Materials up to 44 HRC
  • Alloy Steel (1045, 1117, 1215, 4140, 4150, 4340, 8620, H1-11)
  • Naval Brass

Our Cold Formed Products

Grob Inc. has the capabilities to manufacture the following cold formed products.

A cold formed spline shaft features high torsional strength and a high contact area. We offer standard spline shafts and custom spline shafts. Our spline shafts have an even number of teeth and are parallel over at least two teeth. Compared to conventional key shafts, our cold formed shafts transmit more power due to even load distribution and are ideal for replacement parts or proprietary components.

Grob Inc. offers custom manufacturing capabilities suitable for unique profile needs, offering a wide range of standard parts and products, with capabilities that include:

  • Custom Spline Shafts
  • Involute Spline Shafts
  • Straight-Sided Spline Shafts
  • Ball Spline Shafts
  • Metric Spline Shafts

Grob Inc. bushings nicely complement our cold formed splines, manufactured to tight tolerances to ensure a perfect fit. If our standard broached sleeve products do not meet specific design needs, we can customize broached sleeves to fit any of our standard spline products. Custom broaching can simplify assemblies while saving time and money.

Selecting the proper timing belt pulley eliminates slipping to achieve precise positive drive action. Grob Inc. specializes in manufacturing high-quality timing belt pulleys for a wide variety of applications, from speed to precision to heavy-duty machinery.

Our team can help customers choose the right timing belt pulley from our stock inventory to fit their applications. Grob Inc. also offers custom manufacturing capabilities for customers with highly unique or specific profile needs.

Cold formed spur gears offer flexibility and versatility. The cylindrical toothed components can be used in industrial equipment to control power, speed, and torque while transferring mechanical motion.

Grob Inc. keeps long bars of material in stock, giving us the ability to efficiently machine or cut any steel spur gear to the desired length. We use our own tooling to produce cold formed spur gears, allowing us to fabricate a product that meets the demands of a broad range of standard or customized applications.

Motion transfer applications rely on custom timing belt pulleys to increase or transfer speed. The component can also effectively transfer rotary motion between shafts.

Grob Inc. utilizes precise manufacturing and design techniques to ensure custom timing belt pulleys have the following capabilities:

  • Minimized vibration
  • Minimized chordal effect
  • Slip-proof engagement

We use a variety of designs and materials to achieve different performance characteristics suitable for various operating environments, such as rust or abrasion resistance. Our engineering team can modify the geometry and materials used to meet the requirements of a specific application.

Grob can custom broach your parts to fit any of our spline shafts. The benefit of this is saving time, money, and streamlining your assembly process.

We provide spline shafts and profiles that can be used as proprietary components or replacement parts. They are designed to maximize torsional strength and contact area.

Grob Inc. can manufacture heat exchanger tubing and sheet metal drums. The components are generally fluted or splined to reduce liquid surface tension or increase surface enhancement. Our metal drums can be formed over a hardened mandrel to create interior or exterior forms.

Other common heat exchanger applications include:

  • Clutch drums
  • Drivelines
  • Desalinization units
  • Transmission drums

Custom Machining Services

Grob Inc. also offers CNC machining for finishing cold formed components or creating new components from bar stock. With our inspection lab and state-of-the-art machinery, we provide customers with superior quality, cost-effective products. Our CNC machining capabilities include the following:

  • 5-Axis Milling
  • OD Grinding
  • Cutting
  • Digital Optical Comparator
  • Centerless Grinding
  • Surface Grinding
  • CMM
  • Turning
Custom Machining Services

Advantages of Our Cold Formed Products

To improve the mechanical and dimensional properties of hot rolled steel, the material undergoes cold forming. The cooled hot rolled steel passes through a series of room temperature rollers. Since the material is no longer hot, it loses its malleable properties, requiring considerable pressure to compress the form into its desired shape. Even though the process can be more expensive and labor-intensive than the hot rolling process, cold forming results in better surface qualities and tighter dimensional tolerances.

Cold rolled steel offers significant advantages over hot rolled steel, including:

Higher Strength

Cold rolled steel has 20% greater strength than hot rolled steel, making it better suited for high-stress applications.

Improved Surface Finish

Cold formed products typically have a smoother, shinier surface free of scale and rust.

More Precision

Cold rolled steel does not shrink when formed, which would occur with hot rolled steel. This property enables the manufacturing of precise parts requiring minimal secondary processing.

Contact Grob, Inc. for High-Quality Cold Formed Products

At Grob Inc., we have the knowledge, tools, and skills to create custom cold formed products for nearly any custom or standard application. As a family owned and operated company, we employ more than 60 engineers and technicians at our 100,000-square-foot headquarters and manufacturing facility in Grafton, Wisconsin.

Contact us today to learn more about our cold formed products and manufacturing capabilities. Request a quote for detailed pricing information pertaining to your specific application.

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Grob, Inc.
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