What is the principle of erowa fixture?

Publish Time: 2023-12-19

The EROWA fixture is a set of fast and precise positioning fixtures that mainly rely on the joint action of the electrode holder and the chuck. The chuck is locked on the workbench or spindle, and the electrode chuck clamps the electrode. Some people may ask why their electrode processing can be greatly improved in terms of speed and accuracy just by relying on these two parts of accessories.

First of all, the clamping force source of the EROWA clamp relies on the ball locking device composed of inner wire steel balls, turntable ball lock grooves and rivets. When the air valve is opened, the air pressure is greater than the pressure of the spring on the turntable, and the turntable moves upward. The steel ball hole of the inner wire just corresponds to the ball lock groove. The steel ball has enough space to move, and the chuck assembly can be easily placed into the chuck. When the air valve is closed, the pressure of the spring is greater than the air pressure, the turntable moves downward, and the steel balls form a clamping effect on the inclined surface of the turntable and the snap ring of the rivet. This provides a clamping force of more than 6,000 Newtons.

The high accuracy then comes from the interaction between the flexible positioning tabs and the rigid positioning edges of the chuck. The positioning prism of the chuck is inserted into the hole of the positioning piece and is pre-positioned; after clamping, the positioning piece undergoes elastic deformation, and the line contact and flexible deformation form a stable friction connection, thus forming a positioning position between the flexible positioning piece and the rigid positioning prism teeth. Accuracy, and the positioning piece and positioning prism only contact with one line. The flexible positioning piece sweeps away chips, and the contact surface is minimized to minimize the impact of chips and particles.

Finally, we all know that precision and chips and dirt cannot coexist, so the compressed air is blown clean on the surface of the supporting feet at the moment before each clamping.


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