The George A. Mitchell Company is the industry leader in Push Pointing technology with more than four decades of Push Pointer design and manufacturing experience. We are an original equipment manufacturer and custom designer of hydraulic push pointers for tubular and bar products as well as hydraulic cold forming machines of near net shapes for automotive and specialty products. As a compliment to the push pointers, we offer custom material handling equipment for larger outside diameter tubes. We have designed and built over 400 Push Pointers, 100 cold forming machines, and numerous associated layouts of material handling equipment.
MITCHELL PUSH POINTERS are hydraulically powered. Contoured gripper jaws hold the tube in place while drawing dies are successively forced over the end of the material reducing itto a smaller diameter. A special MITCHELL device guides the reduced end producing a straight and concentric point. This perfectly round point has a uniformly gradual reduction from the tube O.D. The resulting high tensile strength all but eliminates the loss of the point at the start of subsequent drawing operations. Wall thickness of the point is generally greater than that of the tube, but the point can never be closed solid. A center hole always remains in the point to permit free air passage during later processing. MITCHELL PUSH POINTERS are used in both the ferrous and nonferrous industries to accommodate pierced, extruded, tube reduced, welded, and previously drawn tubes. All pointing operations are done cold. Using jaws with a gripping surface specially developed for the purpose, ferrous tubes can be pointed in the prelubricated condition. This is a major MITCHELL advantage - eliminating pickling and lubing after preheating that is usually required [especially for thick wall tubes] when other pointing methods are used.
A wide variety of tube Push Pointer designs is offered, with pushing capacities ranging from 5,000 Ibs. (22kN) to 1,000,000 Ibs. (4,450kN), to accommodate tube sizes from 0.25" (6.4mm) to 16" (406mm) O.D. and walls ranging from .010" (0.25mm) to 1.500" (38mm). The Units are provided with either a linear or rotary indexing mechanism or an "In Line" design to present two to six dies in succession to suit the requirements. Machine cycle times are extremely fast, varying from 3 to 35 seconds, depending upon the size of Pointer and type of operation.
We form successful customer partnerships by coupling our customer’s knowledge of specific market demands with our proven design experience and continuous research and development. The result of the customer partnership is a push pointer or cold forming machine that meets or exceeds the customer’s production expectations, provides a quick return on investment, and performs consistently and reliably. We maintain our customer partnership through customer feedback, on site technical support, and further research and development to adjust to market changes.
Our worldwide customers, located in over 30 countries, are in the ferrous and non ferrous industries and produce basic cold drawn tubes and bars, automotive parts, or specialty parts. The tubing and bar material includes aluminum, brass, copper, carbon steel, alloy steel, stainless steel, and specialty metals. The tubing forms include pierced, extruded, tube reduced, welded and previously drawn.
For the carbon and alloy steel tube industries, we have developed equipment which can grip and, without heat, push point tubing that has previously been phosphate undercoated and reactive soap lubed to facilitate the subsequent draw bench operation. This procedure has many advantages over other pointing operations, such as rotary hammer swaging or forging, which must be done before applying the drawing lubrication.