Key indicators for the selection of back pull tool handle?

February 15, 2022

It's estimated that you are familiar with the handle, but many people don't know about the back pull handle. Let's take a look at the principle of the back pull handle!

Principle of back pull tool holder: it uses back pull collet and back pull screw to fix and clamp the tool. Without nut, the locking of tool holder chuck is more convenient and stable. The utility model is characterized in that the tool handle is provided with an upper through hole and a lower through hole, and there are connecting holes and connecting bolts between them. The hole wall of the connecting hole of the tool handle is provided with a ring groove, and the bolt head of the bolt is provided with a connected telescopic hole and an inner screw hole. The bolt is used to rotate, and the collet is placed in the lower through hole of the tool handle, which is integrated with the bolt back pull collet and the tool lock.

Choosing the right tool handle is a key step in defining the machining process of parts. Choosing the appropriate tool holder can greatly improve the cutting parameters and cutting efficiency; Under the manufacturing requirements of some expensive parts, avoiding tool drop and tool chatter is the key. The tool handle accounts for less than 2% of the total production cost. Even if the cost of the tool holder is halved, it will only save a negligible amount of the total production cost, and the scrapping of the workpiece or the fracture of the tool will have a significant impact on the cost.

Key indexes for selection of back pull tool shank

Clamping reliability

The clamping reliability of the tool handle is reflected in that the clamping force of the tool handle on the tool is large enough, and the phenomenon of tool dropping can be avoided, resulting in processing waste.

Dynamic balance and damping

Excellent dynamic balance, damping and shock absorption can reduce tool vibration, reduce machining surface vibration marks and improve surface finish. At the same time, due to the reduction of tool vibration, it can reduce the risk of tool being pulled out or broken or even broken, save tool cost, protect machine tool spindle and improve cutting efficiency.

Clamping accuracy

High tool clamping accuracy can be directly fed back to manufacturing accuracy. When high-speed or high-precision machining is carried out, the clamping accuracy of the tool handle, that is, the coaxiality between the tool and the spindle, is the first consideration. The eccentric vibration of the tool will lead to the tool can not provide a constant cutting force, which will affect the cutting quality and even the risk of edge collapse and tool breakage. The clamping accuracy of the tool handle is high, which can also reduce the tool cost

Debugging difficulty.

The general principle of NC tool holder selection is: convenient installation and adjustment, good rigidity, high durability and precision. On the premise of meeting the processing requirements, try to choose a shorter tool handle to improve the rigidity of NC tool handle processing.

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Author:

Mr. jiames.wang

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info@qfmh.com

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