What is the toolholder pull stud and what are its characteristics?

February 01, 2021

High speed, high efficiency, compound, high precision, high reliability and environmental protection are the development trend of advanced cutting technology, and also the requirements of NC tool holder. Toolholder is a kind of tool, which is the connecting part of mechanical spindle, cutting tool and other accessories. At present, the main standards are BT, SK, capto, BBT, HSK and other specifications of spindle models. Rivet is also known as core pulling rivet. Core pulling rivet is a kind of single-sided riveting, but it must be riveted with special tools, such as manual, electric and pneumatic.

This kind of rivet is especially suitable for riveting occasions where it is inconvenient to use ordinary rivets (riveting from both sides), so it is widely used in construction, automobile, ship, aircraft, machinery, electrical appliances, furniture and other products. Among them, the open type flat round head core pulling rivet is the most widely used, the countersunk head core pulling rivet is suitable for the riveting situation where the performance needs to be smooth, and the closed type core pulling rivet is suitable for the riveting situation where the performance requires higher load and certain sealing performance. BT toolholder with 7 / 24 taper has been used in machining center to realize the connection between tool and machine tool spindle. The standard 7 / 24 cone joint has many advantages.

For example, the tool can be loaded and unloaded quickly; the cone of the toolholder is tightly contacted with the inner cone of the spindle under the action of the axial tension of the pull rod, and the solid cone directly supports the tool in the taper hole of the spindle, which can reduce the overhanging amount of the tool; only one dimension needs to be processed to a high precision, so the cost is low and reliable.

When it comes to toolholder, we have to mention that one of the factors affecting the quality, style, durability and service life of the tool is the material of the toolholder. Of course, we can't say for sure that "a certain material must be better than other materials. Each material has its own advantages and disadvantages, from its shape, texture, quantity, wear resistance and other aspects.".

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