Questions and answers on the common use of hydraulic toolholder

April 12, 2021

In order to achieve better processing effect, hydraulic toolholder is often applied to many fields. Today, let's first understand the common use questions of hydraulic toolholder

Q1: what's the difference between hydraulic tool handle, powerful tool handle and cold pressing tool handle?
A: The powerful tool holder has large clamping force and high centering accuracy, which is suitable for powerful cutting. The performance of hydraulic toolholder is similar to that of powerful toolholder, but the accuracy is high. The comprehensive accuracy of good hydraulic toolholder can reach 0.002mm. Cold pressed and heat shrinkable toolholders may be the trend in the future and will replace the collet toolholders.

Q2: does the removal of hydraulic toolholder affect the clamping?
A: Hydraulic toolholder belongs to high-precision toolholder, so each tool should be used for one toolholder as much as possible, and the disassembly of ordinary toolholder should be reduced as much as possible.

Q3: how to take out the tool when the pressure bolt of hydraulic tool handle is loose?
A: It may be that the inside of the handle is blocked. You can try to blow air from the cold hole in the tail of the handle with an air gun to clean it.

Q4: advantages and disadvantages of hydraulic toolholder and thermal expansion toolholder?
A: Hydraulic tool holder is a widely used tool holder. The clamping mode of this kind of tool holder is different from the traditional tool holder system. Tightening only needs a pressure bolt. When the bolt is tightened, it will push the sealing block of the piston to generate a hydraulic oil pressure in the tool holder. The pressure is evenly transmitted to the steel expansion sleeve from the circumferential direction, and the expansion wall will clamp the tool. The accuracy and clamping strength of the hydraulic tool holder are good.

Q5: why the tap is not equipped with hydraulic tool holder?
A: Hydraulic toolholder is a bit overqualified for taps, the thread requirements are not so high, and the chip removal space of taps is small.

Q6: what's the difference between the pull pin for the hydraulic handle and the pull pin for the collet handle? Is it the same?

A: The difference is not that the handle is different, but that the machine tool spindle specifications, as long as it is the same equipment, the pin is the same specification.

The principle of the hydraulic toolholder is to use two concentric cylinders to seal both ends to form a cylindrical cavity. One of the cylinders is filled with hydraulic oil and a certain pressure is applied to the oil. This pressure will be transmitted to each part of the oil chamber by an equal value. The outer walls of the two concentric cylinders are thinner and expand outward when subjected to pressure. According to the deformed thin wall, the inner hole can be expanded and clamped, and the outer diameter can be expanded and clamped. At this time, the thin wall actually bears uniform oil pressure everywhere, so after the inner diameter and outer diameter of the part are tightened, its clamping accuracy will be very high. Based on this principle, the hydraulic toolholder was developed and successfully applied in NC machining and manufacturing.

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Mr. jiames.wang

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