In the mask machine industry in April, meltblown micro-drills and taper milling cutters became popular tool products. Helmet molds and many mold milling cutters in May also gained a wave of enthusiasm, although the market hotspots in the second half of the year are difficult It is expected that, but the cutting tools in the "cutting edge" of metal processing will rarely be "absent" in the popular processing field in the market. From the outbreak of the medical industry triggered by the epidemic to the huge industrial dividends affected 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.

No matter how the processing needs change, the precision of products has increasingly become a common feature of all industries. This is implemented in the metal processing link. The cutting tool must ensure the precision of the processing. In addition to its own product characteristics, it also requires a high level of support for the tool holder. Today we are going to talk about those things about knives and handles.
The important role of the tool holder system

First of all, we must emphasize that for precision machining, tool holders are not just simple clamping tools. Tool vibration directly affects the quality of the machined surface. Therefore, it is very important to maintain uniform cutting force characteristics and avoid tool vibration during the cutting and finishing process. As an intermediary, the tool holder connects the spindle of the machine tool and the cutting tool, and the machine tool uses the tool holder to transmit power to the cutting tool tip to realize cutting processing. Without a good tool holder, no matter how good a machine tool is, it is futile.

It can be said that the tool holder system plays a role of a bridge in the cutting process, that is, a link between the previous and the next. The following is mainly reflected in the following: some parameters of the spindle's performance, torque, speed and other parameters are output through the tool holder; the start and the next reflect that the tool holder needs to be clamped to achieve normal processing. In more and more precision machining applications, grinding, polishing or corrosion is no longer necessary after milling. In these applications, the tool holder system plays a key role in ensuring the accuracy of tool rotation, compensating for vibration, ensuring the accuracy of the geometric base surface and the perfect quality of the machined surface.

Spring knife handle
Working principle: The tapered spring collet is gradually contracted during the axial movement (locking) to realize the clamping of the cutting tool;

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

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

Key point: Whether the spring jacket can shrink perfectly and uniformly is one of the key factors that determine the runout accuracy. The bearing-type nut can greatly reduce the torque on the jacket during locking.

Hydraulic Tool Holder
Working principle: Use hydraulic pressure to shrink the inner diameter of the tool holder to realize clamping and cutting tools;

Scope of application: high-precision machining of end mills, carbide drills, diamond reamers, etc.;

Features: Easy to operate, only one T-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 if it is a new job Personnel can also be stably clamped; completely waterproof and dustproof; good anti-interference performance, some slender hydraulic tool holders on the market can already be comparable to the anti-interference performance of heat-shrinkable tool holders.

Shrink Tool Holder
Working principle: The difference between the coefficient of thermal expansion between the handle and the cutting tool is used to realize the clamping of the cutting tool;

Scope of application: processing occasions that require high interference conditions;

Features: good anti-interference; small clamping range, only one size of cutting tool can be clamped; good initial runout accuracy (decrease faster as the number of heating increases); special heating and cooling devices are required, and safety is poor , The requirements for operators are high.

Power Milling Tool Holder
Working principle: the tool holder body is compressed by the nut to shrink, and the cutting tool is clamped;

Scope of application: heavy cutting of end mills;

Features: high rigidity; strong clamping force, the largest clamping force among all clamping tool holders; poor anti-interference; (recently, some manufacturers have introduced powerful milling cutter holders with a nut outer diameter of only 32mm ) The runout accuracy is average, generally below 0.02mm, but some manufacturers have achieved 5~10μm;

Key points: Whether the elastic deformation is uniform and whether the shrinkage is sufficient. (The thickened design of the chuck can increase the rigidity and bear the heavy cutting of the end mill).

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

Side-fixed shank
Working principle: lock the cutting tool by fixing screws on the side;

Scope of application: used for rough machining such as drills and milling cutters for flat shank;

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