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WI: (262) 446-4431 IL: (773) 346-7000

 
Precision Machined Parts and Custom Engineered Part Categories

Product Categories

Gorham Incorporated represents world-class manufacturers that specialize in the various manufacturing processes:

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Metal Stampings and Fabrications
– Stamping is a manufacturing process that utilizes coiled strip metal that passes through a series of progressive dies, punches and forms which produces a finished part. There are several different production metal stamping machines used in the industry; Progressive punch presses and four-slide or multi-slide machines. Each machine has advantages and drawbacks.  Punch Press machines utilize virtually unlimited tonnage applied to the work for greater forming. Speed of these machines is also a benefit in some cases. Punch presses utilize a progression of dies in one unitized master tool. These tools can be expensive based on the intricacies of the finished part. The part progresses through the die into stations on a carrier strip and is cut off in the last station of the die. Four-slide or Multi-slide machines utilize coil strip or ribbon metal which passes through a punch press section that blanks out specific features. The part is then separated from the carrier strip and is sent into the forming or slide section of the machine. Form tools are located at right angles to each other, operating off cams in a horizontal or vertical plane and a center forming post. Each of these elements can be tooled to perform specific bending, forming, assembly, or part removal function. Four-slide or Multi-slide tooling tends to be less costly and more versatile than Punch Presses. Part configuration and quantity will determine what type of metal stamping machine is best to produce a finished part. In cases of lower volumes, metal stamped parts can be produced with sheet stock material and the utilization of a laser cutting machine; forming of the part is done as a secondary process with a brake press. This process will yield less costly tooling to produce the part but the part will cost more due to the secondary process.

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Aluminum Extrusions –Extruding is a manufacturing process of forcing aluminum billet through a shaped opening in a die produced on an extrusion press.  The extruded material emerges as an elongated piece with the same profile as the die opening. The basic principal of extrusion is as simple as squeezing toothpaste out of a tube. Pressure is applies at the closed end of the toothpaste tube forces the paste to flow through the open end. The shape, or profile, of the paste reflects the shape of the opening through which it is forced. Pressure in an extrusion press is applied by a hydraulic ram which forces heated aluminum billet through the container and out the die. The amount of force dictates the size of the profile it is capable of producing; the higher the tonnage of the press, the larger the possible extrusion. The container of the extrusion press is a hollow chamber fitted with a removable liner. The container has a slightly larger inside diameter than the billet to be extruded. The die is a steel disc at the end of the container; heated aluminum is forced through the opening in the die to create the extruded shape. Extrusion dies are available in three basic categories: solid, semi-hollow and hollow.

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Precision Machining – is a manufacturing process in which power-driven machine tools such as saws, lathes, milling machines and drill presses are used with a sharp cutting tool to mechanically cut the material to achieve the desired geometry.  The traditional machining processes include: turning, boring, drilling, milling, broaching, sawing, shaping, grinding, planning, reaming and tapping.  Types of machines that produce precision machine components include screw machines (both single spindle and multiple spindle bar machines), CNC controlled Horizontal, Vertical machining centers and lathes.  These machines utilize either metal bar stock, cast or forged metals. The quantity, accuracy, shape, finish and material will determine what type of machine should be used. Tooling is typically perishable and lower cost than other metal manufacturing processes.

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Cold Forming or Heading
– is a high speed forging process where coiled wire at room temperature is precisely sheared to length, and moved through a progression of dies and punches to form the metal into a shape. Fasteners are typically made by cold forming. This process can be accomplished by either forward or backward extrusion of metal, or by upsetting. Forward extruding involves capturing a cut-off slug of material or blank in a die, then forcing the blank through a diameter smaller than itself. This is done under extreme pressure that results in a smaller reduction in diameter. Backward extrusion is accomplished by placing a cut-off into a die cavity, and then forcing a pin into the cut-off. This leaves no place for the material to go but to flow backward along the outside diameter of the pin. Upsetting or heading is a forging operation. In Upsetting, a blank is held in a die while the punch applies tremendous force to the end of the blank. This force exceeds the elastic limit of the metal causing it to flow. Consequently, the blank becomes shorter and thicker. Extruding reduces diameter and increases length while upsetting increases diameter and decreases length. Cold heading produces components with improved grain structure for improved structural strength. Cold forming is typically less costly verses a machining process.

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Knobs & Handles
– Are manufactured through an injection molding process and are made from a thermoplastic and or thermoset plastic material.  Plastic pellet material is fed into a heated barrel, mixed, and forced into a mold cavity where it cools and hardens to the configuration of the mold cavity.  After a product is designed, molds are made by a moldmaker (or toolmaker) from metal, usually with either steel or aluminum, and precision-machined to form the features of the desired part.  Injection molding is widely used for manufacturing a variety of plastic parts, from the smallest component (knobs) to entire body panels of cars.

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Seals & Bearings
– Seals are a device that prevents the passage of fluids along a rotating shaft. Seals are necessary when a shaft extends from a housing (enclosure) containing oil, such as a pump or a gearbox.  Leather, synthetic rubber, Viton and silicones are among the materials used for the sealing ring.

Bearings are precision machined component that is designed to reduce friction, between moving parts or to support moving loads.  There are two main kinds of bearings:  the antifriction type, such as the roller bearing and the ball bearing, operating on the principle of rolling friction; and the plain, or sliding, type, such as the journal bearing and the thrust bearing, employing the principle of sliding friction.  Roller bearings are either cylindrical or tapered (conical), depending upon the application; they overcome frictional resistance by a rolling contact and are suited to large, heavy assemblies.  Ball bearings are usually found in light precision machinery where high speeds are maintained, friction being reduced by the rolling action of the hard steel balls. In both types the balls or rollers are caged in an angular grooved track, called a race, and the bearings are held in place by a frame, commonly called a pillow block or plummer block.  Ball bearings or roller bearings reduce friction more than sliding bearings do.

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Wire Rope & Lanyards
– Wire rope is a type of rope which consists of several strands of metal wire laid (or ‘twisted’) into a helix.  Initially wrought iron wires were used, but today steel is the main material used for wire ropes. Assemblies are quite common using wire rope and other components.

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Import Sourcing
– From time to time, we have heard from some of our customers who are looking for foreign sourcing. These customers still require repeatable quality including PPAP submissions, dependable delivery with flexible stocking terms, and engineering assistance, all at a lower cost than domestic suppliers can provide.

Gorham Inc. has been in business for over 65 years and we have developed business relationships with past and present acquaintances that have strong connections with Asian and Latin America (Mexico) import partners. We have successfully supplied products such as Oil Seals, Bearings, Machined Components, and Assemblies.  We all compete in a world market and we too need to be able to provide our customers with sources that address their foreign initiatives.  If you are interested in exploring alternative foreign sourcing, we invite you to contact us.