CFH Harmonic Gearbox in Automatic Tool Changer of CNC Machine

The automatic tool changer CNC boring and milling machine produced by a customer in Shenzhen utilizes harmonic gearboxes in the tool magazine transmission section to achieve high reduction ratio and low-speed rotation of the tool magazine.

After several months of operation testing, no issues have been encountered, and it effectively meets the requirements of the automatic tool changer CNC boring and milling machine for the tool magazine transmission section.

Harmonic gearbox is a new type of transmission technology in harmonic gear transmission devices, known for its high motion accuracy, large transmission ratio, lightweight, and compact size. Its application in the automatic tool changer CNC boring and milling machine further proves its advantages in terms of simple structure, small size, high reduction ratio, high transmission efficiency, smooth operation, impact resistance, reliability, and stability. The main components of a harmonic gearbox include the rigid wheel, flex spline, bearings, and wave generator, all of which are necessary. The number of teeth on the rigid wheel is slightly larger than that on the flex spline.

In the automatic tool changer CNC boring and milling machine, Fubao Technology adopts the CFH (hollow type) harmonic gearbox, which is designed to save mechanical equipment space and reduce overall costs. Therefore, it features a large-diameter hollow hole and a flat shape design.

The main structural features of the CFH (hollow type) harmonic gearbox are as follows:

• Wave generator: An elliptical cam with a thin ball bearing embedded in the outer ring, forming an elliptical-shaped component.
• Bearings: The inner ring of the bearing is fixed on the cam, and the outer ring undergoes elastic deformation through the rolling balls. It is usually installed on the input shaft.
• Flex spline: A component with a thin-walled cup-shaped metal elastic body. The outer ring of the cup has teeth. The bottom of the flex spline is called the membrane and is typically installed on the output shaft.
• Rigid wheel: A rigid ring-shaped component with teeth on the inner side, which has the same size teeth as the flex spline and two additional teeth. It is generally fixed on the housing.

The lifespan of a harmonic gearbox is the most direct indicator of its quality, and it directly determines the normal working duration of the automatic tool changer CNC boring and milling machine. As a premium supplier of harmonic gearboxes, Fubao Technology's CFH (hollow type) harmonic gearbox has a theoretical lifespan of over 20,000 hours and maintains precision within 10,000 hours.

In addition to automatic tool changer CNC boring and milling machines, this type of gearbox is widely used in CNC machine tools, industrial robots, photovoltaic equipment, medical devices, semiconductor equipment, aerospace, and other fields.