To ensure efficient and high quality machining of deep holes, special machine tools, that are modern, highly productive and reliable, are essential..

Ryazan deep-hole drilling and boring machines have been designed in a range of sizes and configurations to meet these requirements.

ALL RYAZAN MODULAR DEEP-HOLE DRILLING AND BORING MACHINES ARE AVAILABLE IN THE FOLLOWING CONFIGURATIONS



Standard Lathe Style
Workpiece held in work headstock chuck and set in roller steadies.
Drill tube clamped in boring saddle.
Rotating workpiece.
Stationary tool.



Universal Lathe Style

Workpiece held in work headstock chuck and set in roller steadies.
Drill tube clamped in travelling rotating boring headstock.
Rotating workpiece.
OR Rotating tool.
OR Counter rotating workpiece and tool.



Standard Central Headstock Style
Workpiece held in chucks at each end of hollow work headstock and set in roller steadies.
Workpiece end faces are readily accessible for measuring or tool replacement. Ideal for pull counter boring and skiving and burnishing.
Drill tube clamped in boring carriage.
Rotating workpiece.
Stationary tool.



Universal Central Headstock Style
Workpiece held in chucks at each end of hollow work headstock and set in roller steadies.
Workpiece end faces are readily accessible for measuring or tool replacement. Ideal for pull counter boring and skiving and burnishing.
Drill tube clamped in travelling rotating boring headstock.
Rotating workpiece.
OR Rotating tool.
OR Counter rotating workpiece and tool.



Stationary Workpiece Style
Workpiece held in clamping fixtures replacement. Drill tube clamped in travelling rotating boring headstock.
Rotating tool.
Stationary workpiece.


Effective machining methods for high-quality machining
Machining of deep holes of high accuracy and quality of surfaces is considered as a complex technoligical operation. Special methods of machining should be used, which meet the strong requirements to the quality of machining, and which allow to shorten the technological time significantly .

Ryazan deep-hole drilling and boring machines

1. The machines have a wide rigid bed with two hardened rectangular guideways.


2. Types of deep hole drilling and boring operations and the technological capabilities of the Ryazan machines:
   
   
   • Solid drilling
   • Trepanning
   • Boring
     Boring modes:
     • push counter boring (direct stroke of tube stock);
     • pull counter boring (reverse stroke of tube stock).
   • rolling
   • honing
   • boring of stepped cone-type holes (details of mold type)
     To fulfill such kind of boring operations the machines are equipped with a CNC system and extra devices for cone boring.
   • for boring of stepped holes of conic or cylindric type the machines are euipped with a CNC system and extra devices, that ensure the linkage of cutter extension and of tube stock linear travel.
   • for spiral-cutting operations with constant or varying angle of pitch the machines are equipped with a CNC system.
   • the machines can be optionally eqipped with a turning carriage unit for facing operations, boring of outer necks, and besides outer thread cutting and inner thread cutting (deep up to 200 mm).
3. 
   Methods of deep-hole drilling and boring applyed by the Ryazan machines:
   
   
   • BTA (STS) method – single drill tube machining
     The coolant flows externally between the drill tube and the workpiece wall to the cutting inserts. Chips and coolant are removed continuously through the interior of the drill tube.
     This method is used by solid drilling, trepanning or boring operations.
     The efficiency of this machining method is 5 times higher than by gun-drilling.
   • Ejector system (two drill tubes)
     The coolant flows to the gap between two drill tubes, and it is removed with the chips via the tool hole and the drill tube hole.
   • Gun-drilling (one cutting edge machining method)
     The coolant flows through the tool hole and is removed with the chips via the V-type channel along the drill tool.
4. 
   Ryazan deep-hole drilling and boring machines can be built in various versions.
   
   
   • Turning design: workpiece is set in the chuck of workpiece stock and in roller rests, the drill tube with tooling is set on the bed
   • Swivel design: workpiece is set in chucks of workpiece stock, which has a hollow spindle with the inner diameter bigger than the workpiece outer diameter
   • Casing design: a motionless workpiece is set in a mechanism on table
   
   Machining methods:
   
   
   • Both the workpiece and the tool rotate (in opposite directions)
   • The workpiece is rotating while the tool is motionless
   • The workpiece is motionless while the tool is rotating
     
     
5. To expand the technological capabilities, the coolant can be fed to the machining zone through the tube stock and the hollow tube via the oil receiver, either apart or synchronously, that is essential while drilling holes of diameter more than 300 mm.


6. The Ryazan Machine Tool Works produces machines with the most modern equipment:
   
   
   • electrics, programmed controller by Siemens production
   • CNC system of any manufacturer according to the Customer's request
   • linear encoder by AMO ensures the control of the tube stock linear travel
   • hydraulic equipment by ATOS or Rexrot
   • electric cabunet and main control by Ritall
   • The coolant is fed to the cutting zone by means of high-pressure hoses with quick-change connections and with built-in check valves, in case the system being disconnected
   • the lathe can be equipped with a light guard of the work zone (option)
   • DATAFLEX measuring clutches by KTR ensure the control of feed drive torque
   • workpiece and drilling tube stocks are equipped with regulated drives for stepless control of rotation speed
   
   
7. The guide rest design allows to control the hydrolic tightening force of oil receiver to the workpiece end.


8. To shorten the time for tooling change, the machines have the following capabilities:
   
   
   • the covers of tube rests are opened with the help of hydrocylinders
   • the drill tubes are joint to the spindle of tube stock by means of clamps
   • quick change of casings of drill tube stock and workpiece stock.
   
   
9. It is possible to control the following machining characteristics:
   
   
   • rotation speed of spindles of workpiece and drill tube stocks
   • feed of drill tube stock
   • linear travel of the tube stock
   • spindles overtorque
   • overrun of axial force on the leadscrew
   • level and temperature of coolant in tanks
   
   
10. The machines have the following integrated alarm systems:


• blocking operation of guards and protective screens of rotary units of machines
• minimum and maximum (provided with switching off the machine) coolant pressure
• overrun of the leadscrew axial force (provided with switching off the machine)
• overtorque of spindles of the stocks (provided with switching off the machine)
• filter loading in hydraulic pump assembly
• loading of coolant refining filters
• minimum oil level in the oil lubrication tank of the stem stock slides
• minimum and maximum level of coolant in tank.


11. The guideways of the units that travel along the bed are reinforced with an antifriction material (compound).


12. To ensure workpiece headstock smooth rotation and to prevent vibration, the last gear pair consists of chevron wheels one of which transmits the torque through the rubber rods.


13. For covenient machine servicing, the guide rest is equipped with a Ritall control pannel, which is set on the column and can be swung at 1 meter distance from the cutting zone.


14. To prevent the tooling brakage, the control system ensures the emergency stop accoding to a signal of any overload control device in the following order: feed stop, tool withdrawal in the direction opposite to working feed, workpiece and tool rotation stop, abortion of coolant supply.