Introduction of burnishing
Burnishing is a machining technique in which a tool is pressed on the surface of a part of lower hardness, crushing the microscopic ridges generated in machining by chip removal and thus reducing its roughness.

This crushing of the ridges displaces the material from the ridges to the valleys and evens out the unevenness. The result of this operation is the generation of a polished surface, with a significantly lower surface roughness.

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Introduction to the rotary broaching

The rotary broaching operation is a simple, fast, and economical method for machining polygonal shapes (square, hexagonal, hexa lobular, fluted...) both internally (blind or through) and externally, on parts made of a wide range of materials.

The operating principle is simple. The axis of the cutting tool is offset on a 1Љ angle from the axis of rotation of the workpiece, as well as with respect to the axis of the broaching head shank.

This offset causes the broach to rotate by executing an oscillatory movement that causes progressive shearing as it slides into the workpiece.

This pendulum movement faithfully reproduces in the workpiece the profile of the cutting tool used.

It is necessary for the broach to have an undercut angle of 1.5º so that it cuts only a small part of the section of the profile.
If the angle is equal to or less than 1°, the tool will not cut correctly, resulting in poor-quality machining.
If, on the other hand, the angle is greater than 1.5°, the brittleness of the tool is increased.

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Form knurling

In form knurling, the teeth are generated by deformation of the material because the knurls exert pressure on the piece while it turns. This method is made without removing material, so no chips are produced. Due to the deformation of the material, the diameter of the piece is increased. The value of this increase is variable, as it depends on the material of the piece machined and the form and pitch of the teeth generated (see table page 8).

1. Form knurling is imperative when a radial knurling technique (plongée) is used.
2. When the profile of the machine is RGV, RKE, or RKV.
3. When the final diameter of the piece needs to be bigger than the starting diameter.
4. When you have to make a knurling in the bottom of a throat.
5. To make knurling till a face.
6. To knurling in cones or front faces.

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