For ᴍᴀɴy sectors, drilling is an essential machining technique. Among the businesses that create millions of holes, the automotive and aerospace sectors rely heavily on the productivity, quality, and precision of the holes they drill. The required dimensional accuracy and surface roughness can only be achieved by using the right machine tools, equipment, cutting tools, and parameters. This led to the Ips industries’ growth and an increase in the usefulness of their products.
This chapter provides an introduction to the drilling process in ᴍᴀɴufacturing sectors which helps enhance the quality and productivity of drilling operations on metallic materials. It explains the benefits of employing multi-spindle heads to increase drilling productivity and hole quality. An examination of the ho;es produced by a multi-spindle head on aluminum alloys Al 2024, AL6061, and Al 5083 is presented in comparison to standard single shot drilling. Also the impacts of utilizing uncoated carbide and high speed steel tools for making high-quality holes int he production of built-up edges and burrs are explored and discussed.
The primary ᴍᴀɴufacturing procedure for twist drills consists of these three steps: spiral groove processing, heat treatment, and sharpening. The main distinction is the work that the twist drill portion of the forming process does because the heat treatment and subsequent grinding process are essentially the same. The three ᴍᴇᴛʜods of milling, rolling, and grinding are currently the most common ones used to ᴍᴀɴufacture twist drills.
Twist Drill ᴍᴀɴufacturing Process
Milling ᴍᴇᴛʜod: using a forming cutter to mill the unhardened twist drill blank into the desired spiral groove shape. The milling technique has a broad processing range for creating twist drills. The high tool cost, extended ᴍᴀɴufacturing processing times for twist drills, and completion of the final shape prior to heat treatment processing are all drawbacks of the milling procedure. Geometry flaws will occur during heat treatment, and almost all of them will be visible in the completed drill bit. twist drill primarily processing 2.5 to 70 mm.
The milling ᴍᴇᴛʜOD’s drawbacks include expensive tool costs, a protracted ᴍᴀɴufacturing process for twist drills, and finalizing the final shape before to heat treatment. Geometry flaws will occur during heat treatment, and almost all of them will be visible in the completed drill bit.
Rolling: The drill bit is formed by rolling it on a heated blank with four fan-shaped plates. In addition, due to the heat treatment, the geometry of the rolling twist drill will change, making it hard to meet the deᴍᴀɴds of drilling high-quality holes. This process uses plastic deformation of the drill bit maker with less accuracy than milling. The main benefit of this technique is that it uses less of the raw materials needed to make twist drills, which is good for the environment.
When a cylindrical instrument called a drill bit rotates against a workpiece during the drilling process, holes are produced. Three phases make up the drilling operation process: the start and centering phase, the full drilling phase, and the breakthrough phase. First, the precise location of the hole must be determined. Next, the drill bit must be fully engaged. Finally, the procedure must be completed by passing the drill through the underside of the workpiece.
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