Pull Broaching - Steelmans Broaches


Pull broaching is a widely utilized and highly effective linear machining process for creating precise internal and external shapes on a workpiece. Unlike push broaching where the tool is compressed, pull broaching involves applying tensile force to a specialized cutting tool, known as a broach, to draw it across a stationary workpiece. This method is particularly favored for its ability to produce accurate and intricate geometries with excellent surface finishes in a single pass.

The Pull Broaching Process

In pull broaching, the workpiece is securely fixed in a holding fixture on the broaching machine. The broach, a long, slender tool with a series of progressively larger cutting teeth, is then carefully aligned with the workpiece. The process unfolds in the following steps:

  1. Insertion: The leading end of the pull broach, equipped with a pilot, is inserted into a pre-drilled or pre-formed hole in the workpiece (for internal broaching) or positioned against the surface (for external broaching).
  2. Engagement: A pulling mechanism on the broaching machine, often hydraulic or mechanical, grips the pull end of the broach.
  3. Cutting Stroke: The pulling mechanism exerts a controlled tensile force, drawing the broach linearly through or across the workpiece. Each tooth on the broach removes a small, precise amount of material. The progressive increase in tooth size along the broach ensures that the desired shape and dimensions are gradually achieved in a single, continuous stroke.
  4. Completion: Once the entire broach has passed through or across the workpiece, the machined feature is complete. The broach is then returned to its starting position for the next cycle.

Advantages of Pull Broaching

Pull broach offers several significant advantages:

  • High Precision and Accuracy: The rigid nature of the broach and the controlled pulling force ensure consistent and accurate cuts with tight tolerances. The single-pass operation minimizes the accumulation of errors.
  • Excellent Surface Finish: The finishing teeth at the end of the broach are designed to impart a smooth and high-quality surface finish, often eliminating the need for secondary finishing operations.
  • Complex Shapes in One Pass: Pull broaches can create intricate internal shapes like splines, keyways, gears, and irregular forms, as well as external features, all in a single, efficient pass.
  • High Production Rates: The speed of the broaching stroke and the ability to machine complex features quickly make pull broaching ideal for high-volume production runs.
  • Reduced Tool Wear: The tensile force applied in pull broaching helps to maintain the alignment of the broach and reduces the risk of buckling or tool damage compared to push broaching.
  • Versatility: Pull broaching can be applied to a wide range of materials, including metals, plastics, and composites.

Applications of Pull Broaches

Pull broaches are employed across numerous industries for a variety of applications, including:

  • Automotive: Machining internal splines in gears and transmissions, producing keyways in shafts, creating valve guides, and shaping connecting rods.
  • Aerospace: Manufacturing complex internal forms in turbine discs and blades, producing accurate slots and keyways in various components.
  • Firearms: Rifling gun barrels (creating the helical grooves inside).
  • General Manufacturing: Cutting keyways in pulleys and gears, producing internal splines for couplings, and creating various shaped holes and contours in diverse parts.
  • Hydraulics: Machining internal forms in hydraulic cylinders and valve bodies
Conclusion

Pull broaching stands as a vital machining process for achieving high levels of precision, accuracy, and efficiency in the production of parts with complex internal and external features. Its reliance on tensile force and specialized broach design enables manufacturers to achieve superior quality and productivity across a wide spectrum of industrial applications.

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