CNC honing machine for flat-topped honing of cylinder blocks of internal combustion engines.

The HM20 is a vertical honing machine designed for automatic honing of cylinder bores in in-line and V-type internal combustion engines.
Its enlarged working area allows the machine to accommodate a wide range of engines, including large cylinder blocks and other oversized components.
Applications:

• Automotive repair shops, service centers, and engine rebuilding facilities, for reconditioning engine cylinder blocks and other automotive components.
• Manufacturing and engineering plants, for precision honing of round bores in industrial components.

Advanced engineering and proven international honing practices:

• In a number of functional areas, the HM20 outperforms comparable imported honing machines.
• High machining accuracy.
• The enlarged working area accommodates large cylinder blocks, liners, bushings, and other components.
• The machine column moves automatically along the X and Y axes. The Z-axis is servo-driven, providing high positioning accuracy.

Process control and protection:

• The HM20 performs precision honing to achieve the specified surface roughness.
• The control system can store up to 100,000 machining programs.
• An automatic collision protection system helps prevent damage caused by operator error or unnoticed obstructions in the bore. Before each cycle, the machine automatically checks the bore for obstacles.
• The machine control system prevents the honing head from contacting the workpiece at the lower end of the bore.
• This protects the workpiece, including cylinder blocks, liners, and bushings, as well as the honing tool and stone holders.

Honing process:

• Machining is performed to the programmed dimensions with high accuracy.
• Honing stone expansion, or radial feed, is controlled automatically during the honing cycle. The expansion amount is programmed through the CNC system.
• At the end of the cycle, the machine automatically retracts the honing stones during the final stroke, preventing scratches or marks in the finished bore when the tool is withdrawn.

Active bore control and shape correction:

• The active control and bore shape correction system continuously monitors bore geometry during machining. If a deviation from the specified geometry is detected, the system identifies the affected area and automatically performs short-stroke dwell honing at that location.
• The control interface displays a real-time load graph together with a visual representation of the moving honing tool, allowing the operator to monitor the active control process in real time.

Tooling and CNC system:

• The HM20 can be equipped with multi-position fixtures for processing liners, bushings, and other components.
• The proprietary Hontronik ACNC v2.0 CNC system provides flexible control of the honing process and can be configured to meet customer-specific requirements.

Coolant and lubrication systems:

• The integrated coolant system features automatic activation and multi-stage filtration. A magnetic separator removes metal chips during primary filtration, while full-flow fine filters provide final filtration.
• Coolant tank capacity: 160 L. The tank is located in the lower section of the machine and slides out on built-in guides for easy maintenance.
• An automatic lubrication system supplies the ball screws and linear guides. The lubrication station operates in coordination with the CNC system, helping extend component service life and improve overall machine reliability.

The CNC system incorporates proprietary software developed in-house for automatic control of the honing process. The software is registered under Certificate of State Registration of Computer Program No. 2026668051.
HONMASTER HM series CNC honing machines are manufactured at our plant in Ufa, Russia.