In the mask machine industry in April, melt-blown micro drills and taper milling cutters became popular tool products. In May, helmet molds and many mold milling cutters also became popular. Although the market hot spots in the second half of the year are difficult to predict, Cutting tools that are at the "cutting edge" of metal processing are rarely "absent" in popular processing fields in the market. From the outbreak of the medical industry caused by the epidemic to the huge industrial dividends caused by the new infrastructure concept, the processing demand derived from these two directions will become the mainstream of metal processing for a long time to come.

Regardless of how processing needs change, product sophistication has increasingly become a common feature of all industries. This applies to the metal processing process. Cutting tools must ensure processing precision. In addition to their own product characteristics, they also need high-level toolholder support. Today we are going to talk about knife handles.
The important role of the toolholder system

First of all, it should be emphasized that for precision machining, the tool holder is not just a simple clamping tool. Tool vibration directly affects the quality of the machined surface. Therefore, it is crucial to maintain uniform cutting force characteristics and avoid tool vibration during cutting finishing. The tool holder serves as an intermediary to connect the machine tool spindle and the cutting tool. The machine tool uses the tool holder to transmit power to the cutting tool tip to achieve cutting processing. Without a good tool holder, no matter how good the machine tool is, it will be in vain.

It can be said that the toolholder system plays the role of a bridge in cutting processing, that is, a link between the previous and the following. The above mainly reflects that some performance, torque, speed and other parameters of the spindle are output through the tool holder; the next reflects that the tool holder needs to clamp the tool to achieve normal processing. In an increasing number of today's precision machining applications, milling no longer needs to be followed by grinding, polishing or etching. In these applications, the toolholder system plays many key roles in ensuring tool rotation accuracy, compensating vibration, ensuring accuracy on the geometric base surface and perfect machined surface quality.

spring knife handle
Working principle: The tapered spring collet is used to gradually shrink during the axial movement (locking) to clamp the cutting tool;

Scope of application: drill bits, reamers, finishing end mills, etc.;

Features: Large clamping range; good versatility; high precision (some manufacturers);

Key point: Whether the spring collet can shrink perfectly and evenly is one of the key factors that determines the runout accuracy. The bearing nut can significantly reduce the torque on the collet during locking.

Hydraulic tool holder
Working principle: Use hydraulic pressure to shrink the inner diameter of the tool holder to clamp the cutting tool;

Scope of application: high-precision processing of end mills, carbide drill bits, diamond reamers, etc.;

Features: Easy to operate, only one T-shaped wrench can be tightened, which is the simplest clamping method among all tool holders; the accuracy is stable, and the tightening force does not directly act on the clamping part, even new operators can Stable clamping; completely waterproof and dustproof; good anti-interference performance. Some slender hydraulic tool holders on the market are comparable to the anti-interference performance of heat shrink tool holders.

Heat shrink tool holder
Working principle: The difference in thermal expansion coefficient between the tool handle and the cutting tool is used to clamp the cutting tool;

Scope of application: processing occasions with high interference conditions;

Features: Good anti-interference; small clamping range, can only clamp cutting tools of one size; good initial runout accuracy (declines quickly with the increase of heating times); requires a special heating and cooling device, poor safety, and difficult to operate High personnel requirements.

Powerful milling cutter holder
Working principle: The cutting tool is clamped by compressing the tool handle body through the nut;

Scope of application: heavy cutting of end mills;

Features: High rigidity; strong clamping force, the largest among all clamping tool holders; poor interference resistance; (Recently, some manufacturers have launched powerful milling cutter holders with a nut outer diameter of only 32mm) Runout accuracy Generally, it is generally below 0.02mm, but some manufacturers have achieved 5~10μm;

Key points: Whether the elastic deformation is uniform and whether the amount of shrinkage is sufficient. (The chuck’s thickened design can increase rigidity and withstand heavy cutting by end mills).

The BIG powerful milling cutter holder adopts a unique slit structure, which can evenly deform the chuck, and has strong clamping force and stable runout accuracy.

Side-fixed tool handle
Working principle: Lock the cutting tool through the side fixing screw;

Scope of application: Used for rough machining of drill bits, milling cutters, etc. with flattened shanks;

Features: Simple structure and large clamping force; but poor accuracy and versatility.