Schaublin_Catalogue

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Page - Seite 103.3

Frettage - Schrumpfen - Shrinking

The shrink-fit tool holders have a round bore which expands upon heating and will clamp the tool when cooled.

Experience enables SCHAUBLIN to guarantee shrink-fit toolholders of high quality. The SCHAUBLIN universal shrink-fit tool holders can be used with most heat shrink devices and some induction devices. It is possible to use all types of carbide tool shanks without problems, and under certain conditions HSS shanks with or without carbide liner.

Outer shape :

The outer shape of shrink-fit tool holders is designed to ensure optimum rigidity with a mass ideal for machining. This machining advantage limits the application of cooling machines which depend on the outer shape of the toolholder. SCHAUBLIN makes no compromise regarding the safety of use and the lifetime of the machining spindle!

Temperature of the heat treatment shrinking process :

The temperature required for shrink fit function is dependent upon properties of the tool shank. The closer the diameter is to the upper limit of tolerance, the higher the temperature required. Temperature range is around 150 to 300°C. On the grooved heated portion, the shrink-fit tool holder should not be heated over 400°C. Over 250°C, oxidation may occur.

Shrink-fit on HSS tools :

These tools can be heated and cooled under the following condition: The heating time must be very short to prevent possible deformation of the tool. For more detailed instructions, please contact the manufacturer of the shrink fit equipment. They will provide suitable information on HSS shrinking.

Tool shank tolerances :

The fit between the shrink-fit tool holder and the tool must be accurately determined in order to transfer the forces and the torque values during machining. For this reason, the tolerance of the tool shank should not exceed the following limits: ø4...5: ISO h4 ø6...max: ISO h6.

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