Broaching and broaching services directory including production broaching, keyway broaching, rotary broaching, roto broaching, specialty broaching and contract broaching.
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Broaching and broaching services directory including production broaching, keyway broaching, rotary broaching, roto broaching, specialty broaching and contract broaching. |
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Information Page Links: Featured Broaching Manufacturers ISO
- International Organization
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About Broaching Production broaching is an easy method of precision machining that can be performed on an external surface (round, flat or contoured) or the internal part of a shape or form. Virtually any material, from ferrous and nonferrous metals to plastic materials and wood, can be cut through broaching. Various broaching methods are performed in broaching job shops to cut internal splines, gears and sprockets as well as keyways, slots and serrations on the surface of a workpiece. During the process, machines such as automatic lathes, CNC Swiss lathes and rotary transfer machines are used to push or pull a broaching tool with cutting teeth through or over a workpiece. The only limit to the process is the length and width of the part that is being machined. The most common form of production broaching is done using hydraulic driven broaching machines. This process is commonly known as “pull broaching,” with the broach cutting tool “pulled” through the part in a single pass. The second most common type of production broaching used is “push” type broaching. This is most often used on short run jobs using a hydraulic press, or more commonly, a hand operated “arbor press.” Two other forms of broaching are broaching on a lathe and rotary broaching. While broaching on a lathe, the broach tool must be held at a 1° angle to the workpiece. The cutting face of the broach should be positioned as close to the centerline of the workpiece as possible. The entire process takes place in a matter of seconds. Rotary broaching is similar, except that the tool and part are stationary while the broach holder spins on a spindle, rather than the reverse on an automatic lathe. As the broach tool and the part come into contact, the tool moves in a “wobble” motion; thus, another name for this process is wobble broaching. Broach tools are the parts that actually cut through the workpiece. These tools are held in place by broach holders, and come in many sizes, materials and varieties, based on the desired cut. The two main types of broach tools are internal broaches and external broaches. Internal broaches are pushed through the part, while external broaches pass over the workpiece to remove material on the surface. Broach tools have teeth in varying sizes and shapes that are arranged so that each tooth will cut a chip of precise thickness. Chips are accumulated in spaces between the broach teeth. The size and spacing of the broach teeth is determined by the length of the part being broached. Broaching has many advantages, including high productivity, economical operation, accurate cuts over large runs, close tolerances, versatility and smooth finishes. Some points are important to remember while broaching. As chips accumulate in the hole, they must be cleared periodically so that they do not cause damage to the broach tool. Also, drill the hole as deep as possible to allow room for the chips to accumulate. Sometimes a pressure relief vent on the broach tool is necessary when broaching a tight hole if air, oil and coolant cannot escape. If enough hydraulic pressure is generated, the broach will be pushed back and could cause damage to the machine. A ventilation hole on the tool prevents this.
Types of Broaching
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