CoroBore 820 XL

CoroBore^® XL is the boring tool system for large diameter boring. The bridges and holders enable rough boring to be completed with high productivity. The system gives a more rigid and reliable performance in larger bores and is designed to generate the required hole quality and diameter.

Benefits

• Reliable system with rigid interfaces between head and cartridge for stable and vibration-free boring
• Dedicated cartridges designed for highest stability
• Dedicated tool holders optimized for large diameter boring
• Also available as lightweight tools: CoroBore lightweight boring tools reduce tool weight and tool change moment, making handling easier and larger diameters possible
• Available as damped tools, 820D (Silent Tools), for productive boring even at long overhangs

Features

• CoroBore^® 111 four-edged standard inserts with optimized grade selection for rough boring applications
• Large standard assortment of CoroTurn 107 and T-Max P inserts
• Axially and radially adjustable cartridges giving reduced inventory costs
• Made of high strength aluminum, which reduces assembly weight
• Hard-coated for surface protection of rigid interfaces between all assembly items which maximizes stability and reliability
• Cutting fluid through the tool

Application

• Dedicated geometries and grades for all materials
• Large components, such as, casings, housings, gear boxes, frames, etc.
• Round insert carriers are a productive solution for machining in cladded materials like the boring of Inconel 625 weld in oil and gas applications
  

ISO application area

Read more about CoroBore Lightweight

Read more about Silent Tools for boring.

Recommendations

• Choose CoroBore 111, optimized for rough boring applications KAPR 90° for counterbore operations. Excellent insert for heavy machining and unstable conditions. Recommended depth of cut 15 mm (0.590 inch)KAPR 84° for complex materials such as cladded Inconel
• Choose CoroTurn 107 for general applications, with a wide selection of geometries and grades
• Choose T-Max P for tough applications that require strong inserts and improved process security.
• Step boring is an effective way to increase the depth of cut without excessive vibrations
  

Cutting data

General recommendations for rough boring:

• Starting data: v_c 200 m/min (valid when v_c on insert box is bigger than v_c 200 m/min) at short overhang. Check insert box for feed and depth of cut recommendations
• v_c = 50% of recommended data on label. If vibrations occur, reduce speed and increase feed. Do not use max. recommended feed and a_p at the same time.

Cutting data: CoroBore^® 111

Tightening torque

Insert screw

Product range

CoroBore^® 111 rough boring inserts for CoroBore^® XL

^®Click here to go to CoroBore 111 insert assortment

Overview of assembly parts:

Grades and geometries

*GC3210 Nodular cast iron, GC3205 Gray cast iron
Cutting data recommendations, see main catalog.

Tool holding

From diameter 148–300 mm (5.827–11.811 inch), CoroBore XL has integrated adapters with Coromant Capto back-end coupling. For diameter 298–1260 mm (11.732–49.606 inch), the CoroBore XL holders are developed with a unique tool side interface, optimized for large diameter boring. The holders have a large support area, which generates stability and takes up axial forces with large, flat, driving keys to take up the high torque.
Internal coolant both center and flange. Possibility to rotate driving keys and bridge by 90 degrees.
Bending stiffness and torque transmissions are the most important factors when choosing a tool holder for boring operations. For the best stability and hole quality, use Coromant Capto or the Coromant EH system.
Coromant Capto coupling is the only modular tooling system designed for all metal cutting operations, including all hole-making methods. The same cutting tools and adapters can be used in different applications and machines. This makes it possible to standardize on one tooling system for the entire workshop. Remember the following:

• Choose the shortest possible adapter
• Choose the strongest possible adapter
• If reduction is needed, use tapered version, if possible
• For long overhangs (> 4 x DCON), use dampened adapters
• For long overhangs, ensure rigid clamping with flange contact to spindle, if possible

The Coromant EH system delivers great tooling flexibility – Choose from an extensive variety of heads, adapters, and shanks.

• Reduced tool inventory with standardized tools, minimizing machine downtime
• For boring operations requiring long reach, as in large machining centers in the diameter range of 1–36 mm (0.039–1.42 inch). Deep pockets are a typical application where the Coromant EH system offers the required reach without limiting process security