A gear hobbing machine is a specialized piece of equipment used to process gears by means of a generating process known as "hobbing." This machine utilizes a hob-an advanced cutting tool with multiple cutting edges-to progressively cut the tooth profile into the workpiece (gear blank).
Working Principle
1. Setup and Alignment
1.1 Mounting the Workpiece
Gear Blank: The cylindrical workpiece, often referred to as a gear blank, is securely mounted on the workpiece spindle.
Alignment: The centerline of the gear blank is precisely aligned with the centerline of the hob spindle.
1.2 Installing the Hob
Hob Tool: A cylindrical cutting tool known as the hob, which has helical cutting edges corresponding to the desired gear teeth profile, is mounted onto the hob spindle.
Angle Setting: The hob is set at an appropriate angle relative to the gear blank, typically the lead angle of the hob.
2. Generating Process
2.1 Rotational Movement
Simultaneous Rotation: Both the hob and the workpiece spindle rotate simultaneously. The rotational speeds are synchronized based on the number of teeth being cut and the gear ratio required.
2.2 Axial Feed
Hob Movement: The hob moves axially along the gear blank in a continuous feed motion, contributing to the progressive cutting of the gear teeth.
Feed Rate: The axial feed rate is carefully controlled to ensure gradual material removal and precise tooth profile generation.
3. Cutting Action
3.1 Gear Tooth Fabrication
Incremental Cuts: The hob`s cutting edges engage with the gear blank, removing material in an incremental manner to form the gear teeth.
Continuous Process: As the hob rotates and moves axially, it continuously cuts the gear teeth by the generating process, creating the gear profile progressively.
3.2 Chip Formation
Material Removal: The cutting action generates small metal chips that are removed from the gear blank, forming the desired gear teeth while maintaining high precision.
4. Synchronization and Control
4.1 Indexing Mechanism
Indexing: The machine uses an indexing mechanism to ensure that the gear blank rotates in precise increments equal to the angular pitch of the gear teeth.
Synchronization: The rotational speeds of the hob and the workpiece must be precisely synchronized to maintain the correct pitch and profile of the gear teeth.
4.2 CNC Control (Modern Machines)
CNC System: Modern gear hobbing machines are often equipped with CNC (Computer Numerical Control) systems that automate and control the synchronization, speed, and feed rates.
Programmed Cuts: The CNC system uses pre-programmed parameters to execute the hobbing process with high precision and repeatability.
5. Completion and Inspection
5.1 Finishing the Cut
Full Passes: The hobbing operation typically requires multiple passes until the desired depth and profile of the gear teeth are achieved.
Final Check: Once the cutting is complete, the machine performs a final check to ensure all teeth are uniformly cut.
5.2 Quality Control
Inspection: The finished gear is inspected for dimensional accuracy, surface finish, and overall quality.
Adjustments: If necessary, adjustments are made to the machine setup or operating parameters to correct any deviations in subsequent gear hobbing operations.
Advantages of Gear Hobbing
Efficiency: High material removal rates and efficient production of gears.
Versatility: Capable of producing a wide variety of gear types, including spur, helical, splines, and worm gears.
High Precision: Ensures excellent accuracy and consistency in gear production.
Automation: Modern CNC hobbing machines offer high levels of automation, improving productivity and reducing manual intervention.
Applications
Gear hobbing machines are widely used in industries such as automotive, aerospace, machinery manufacturing, and heavy equipment production to create gears that are essential components in transmissions, engines, and other mechanical systems.
By understanding the working principle of a gear hobbing machine, manufacturers can effectively utilize this method for precise and efficient gear production, ensuring high-quality gear components for various applications.
About Zhejiang Toman Intelligent Technology Co., Ltd. (Toman)
Toman is a company that adheres to the strategic vision of to be the leader in the professional field, with the mission of innovation to drive customer value enhancement, and the business philosophy of WISE, ALWAYS KEEP STEP AHEAD. In operation since 2006, the company includes the complete range of gear hobbing machine, gear cutting machine, gear machining compound machine tools, gear shaving machine, automatic production units, automatic turning production lines, and MES manufacturing execution system, etc. TOMAN today, is recognised as an industry leader for machines in China.
Toman cutting machines:
CNC high precision gear hobbing machine, gear chamfering machine, gear shaving machine, gear hobbing machine with integrated chamfering station etc.
-Profitable -Intelligent -Accurate
Our machines are suitable for commercial vehicle gear, passenger vehicle gear, construction machinery gear, especially for the processing of new energy vehicle gear.
For more information about cnc gear cutting machines, please visit our website:
www.zjtoman.com
www.tomanmachines.com
For further information, please contact:
Sharon Gong
Master of Mechanical Engineering
Whatsapp/Wechat: +8613589398142
Mail: sharon@zjtoman.com
Skype: sharon.gong525