Sandvik - Model RH460 Series -DTH Hammers Drilling Tools

The main focus in the new design and development process have been to:

• Decrease air consumption to reduce fuel costs
• Increase power level for higher productivity
• Optimize lubrication capabilities to increase piston and hammer life
• Improve piston bearing design to reduce failures due to galling

The design of the RH460 hammer makes it easy to service and offers a good balance between cost and performance. The V-lock mount system ensures reliability and eliminates the need for wear shims and special assembly tools. The piston design is optimized with oil grooves in the guide surface to ensure constant and consistent lubrication with dynamic sealing properties. The result, high performance and cost effective hammer for use in almost all ground conditions.

At Sandvik we put safety first
With continued demand from mining companies to ensure safety and increase productivity, Sandvik rock tools are committed to providing the support needed - through safe products and product information. This hammer complies with the health and safety regulations of the European Union (= CE machinery directive).

Low air flow

Features and Benefits
Rising fuel prices have a large economic impact on DTH drilling operations. Lower air consumption in a DTH hammer is key to cutting these costs. The air cycle of the RH460 hammer has been designed to optimize the expansion and compression rate. This results in more power with less air.

The unique V-lock system used in the RH460 hammer is designed to prevent the movement of the inner cylinder and air distributor. This simple design ensures that no special tools are required for assembly or disassembly. By preventing movement of the components, it reduces galling related failures. The steel make up ring creates a constant make up force, independent of temperature and time compared to other elastic material often used for the same purpose.

Lubrication plays a crucial role in the service life of the hammer. The oil film creates an airtight seal between the hammer`s components, reducing friction wear as well as any heat generated between the moving parts. This reduces the number of failures caused by galling.

The RH460 piston has oil grooves incorporated into its design, the oil grooves serve two main purposes:

• They ensure constant and consistent lubrication between the piston and internal parts which reduces galling related failures.
• When the air and oil mix passes the oil grooves they create turbulence, which acts as a dynamic seal. This ensures minimal air leakage.

The RH460 hammer is developed with a solid piston and inner cylinder concept. Since the porting is done externally, the piston is free from air channels. The solid piston is design without cross-holes to reduce stress-induced failures. This, combined with the robust large striking end, increases service life and eliminates premature failures related to fatigue stress.

Bending vibrations in the piston lead to high pressure contact between the internal parts during striking mode. This can cause galling and ultimately failure. In the RH460 the piston bearing surface design and location optimizes bearing capabilities and reduces bending vibrations. The RH460 piston is designed to provide reliability and long service life.