Grinding Process of Extrusion Tap Thread

With the wide application of non-ferrous metals, alloys and other materials with good plasticity and toughness, it is difficult to meet the precision requirements for internal thread processing of these materials with ordinary taps.
Long-term processing practice has proved that only changing the structure of the cutting tap (such as seeking the best geometry) or using a new type of tap material can no longer fully meet the requirements of high-quality, high-productivity and low-cost machining screw holes.

“Cold extrusion chipless processing” is a new internal thread processing method, that is, on the bottom hole of the prefabricated workpiece, the chipless tap (extrusion tap) is used to cold-extrude the workpiece to produce plastic deformation to form an internal thread.
Because the chipless processing of cold extrusion can complete the internal thread processing that cannot be done by ordinary tap cutting, so the application of this process is becoming more and more extensive, and the grinding processing of extrusion taps is also more and more valued by people.

The conical extrusion cone is the most commonly used chipless tap extrusion cone, which has the advantages of light extrusion, small torque, and good roughness of the processed thread. Because its outer diameter and middle diameter both have tapers, the grinding of this extruded cone is more complicated than that of a cylindrical extruded cone: during grinding, the extruded cone angle a of its middle diameter is realized by the taper, and the die plate is The worktable moves and drives the grinding wheel frame to move radially to complete the grinding of the chipless tap into the taper angle.

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