+7 (8452) 21-52-25 +7-906-150-94-49

Heavy Duty Lathes
 
Heavy duty lathe model 1682A diameter 126" x length 551.2"

Specifications:

Max work-piece diameter over bed, mm3200
Max work-piece diameter over cross-slide, mm2500
Turning length, mm14000
Workpiece weight, tons170
Spindle speed range (continuously variable), rpm1.25-80
Maximum spindle torque, Nm921825
Spindle taperdiameter 180 1:7
Spindle bore, mm105
Number of carriages2
Maximum carriage travel, mm14020
Carriage maximum cross-slide travel, mm1200
Carriage maximum upper longitudinal slides travel, mm800
Carriage maximum compound rest slide travel, mm650
Carriage feed, m/min0,02-131,3
Tool holder size, mm70x100
Switch typelimit switches
Overload safety deviceyes
DC main drive power, kW200 (300-1200 rpm)
Diameter of headstock quill, mm650
Diameter of tailstock quill, mm580
Overall dimensions, mm25200x6700x4220
Machine weight, tons330

Manufacturer - Kramatorsk Heavy Duty Machine Tool Building Works (KZTS), Kramatorsk USSR

Condition: the mechanical part is in excellent condition. The electrical part was changed to modern in 2000 and it's fully complete. 

All technical documents including drawings of each part of the machine are available.

General description: The heavy duty lathe model 1682A is used in heavy engineering and power engineering factories, in shipbuilding yards and in factories of other industries for machining of mill rolls, shafts, turbine rotors, etc.
 

The following operations can be performed on this heavy lathe: turning of cylindrical surfaces; processing of conical surfaces at longitudinal slide traverse or by combined feed method; metric and inch screw threads cutting, boring, facing, parting,  radius turning and chamfering.

 

Machining of workpieces can be effected either in centers or when clamping to faceplates of headstock and tailstock.

This machine tool fits a normal accuracy class: straightness allowance is 10 micron.

Heavy and unique machines made by KZTS have received recognition of domestic and foreign customers. Positive reviews of big engineering and other enterprises prove that.

This equipment has obvious advantages over foreign counterparts, such as:

- Rigidity of the structure, which provides high accuracy and performance;

- Easy maintenance – the machines are universal; lathe operators and workers easily work on this equipment (at the same time, the modern tendency to install CNC allows to easily modernize the equipment according to standard modernization projects);

- High reliability;

- Reasonable price allowing covering the cost of the equipment within one year from its commissioning.

The lathes are highly productive; removal of chip with cross section from 60 to 120 mm2 is achieved during rough machining.

The machines can be used in finishing operations with high accuracy.

The main features of the machine tools

High rigidity of basic body parts. High power of main drive.

Adjustable double-row spindle roller bearing.

Push-button switching of spindle speed.

Selection of gear train with hydraulic cylinders.

Reliable clamping system of workpiece with jaws or jaws with worm amplifier.

Smooth change of spindle speed in a wide range.

Positive force lubrication.

Flat guideways and carriages with special textolite and bronze plates.

Remote control of working and rapid traverse of carriage.

Control of main motion from the operator’s place.

Reliable lever-wedge-locked tool clamping system.

Revolving dead center.

Detector, that registers axial force at clamping and turning, as well as safeguards thrust bearings from overload.

Automatic interlocking of main drive stop.

The design of machine tool

The basic units of machine tools: bed, headstock and tailstock, carriage, apron, rests and electrical equipment.

Bed

Box-shaped bed with flat guideways. Rational arrangement of ribs provides high rigidity and sufficient gaps between the guideways - a free and easy channel for chips through the foundation and box channels.

Flat guideways with large supporting surfaces provide low surface pressure and with proper lubrication - motions accuracy, reliability and durability.

Models 1A670, 1682A, 1A681 have four-way beds abutting lengthwise.

Headstock

Headstock assembly has a rectangular box shape.

All shafts are mounted on ball bearings. Spindle bearings are adjustable double row roller bearings, providing high rigidity and stable precision in continuous operation of the machine.

Design of gear train of the main motion helps to reduce gears circumference speed and to increase rigidity of the chain.

Switching of gear trains is performed with remotely controlled hydraulic cylinders directly from the operator’s workplace.

Application of the controlled main DC drive in combination with three-speed gearbox provides a sufficient adjusting range of spindle speed to take full advantage of modern cutting tools.

Gearbox is lubricated with a gear-type pump with a seperate drive.

There are some interlocks on the headstock: the main drive is only activated when the lubrication system is running lubrication and at full engagement of gear trains.

Carriages

Design of carriages provides necessary stability and rigidity when removing large sections of the chips.

Control panels are located on the operating platforms of the carriage.

Carriage slides are textolite-faced, thrust and side surfaces of wedges are bronze-faced. Such facing protects reliably the bed from possible scratches and ensures smooth feeding.

Carriage guides are hardened and grinded. Feed drive works from electric shaft.

Threading on small machines is done by means of lead screw lengthwise carriage stroke; Threading on large machines is with a special screw cutting carriage driven through electrical shaft.

Each slide has a controlled individual DC motor, electrically coupled to the main drive.

Apron

Aprons of the machines are fitted to the bottom surfaces of the carriage slides.

Feed mechanisms are installed into aprons.

Tailstock

Tailstocks have reducers for rapid motion along the bed and for accelerated extension of the quill.

Tailstock clamp to the bed is made with self-locking hydraulic system.

Tailstock is equipped by a top with a rotating faceplate. Tailstock faceplate has four jaws for clamping workpieces.

There is a separate motor for adjusting turn of faceplate.

Built-in detectors measuring axial force warn timely of any additional overloads during operation. The detectors provide long-lasting work of bearings. If axial force is exceeded, the lamp is switched on and you hear an alarm sound.

Rests

Machines are equipped with closed rests with bronze sliding plates or rolling bearings and open roller rests. Open roller rests are mounted on ball bearings.

Machine Control

Motion and operation of slide units of the machine are controlled from separate consoles on the main units or from the primary console which is located nearly the workplace on a carriage.

In addition to the special console, the machine is equipped with portable controls located on each carriage.

Rationally designed control system features a high degree of reliability and easiness of operation that makes it possible to work at optimum conditions, thus allowing increasing productivity and reducing the operator’s fatigue.

Electrics

Electrical equipment of the machines is powered from three-phase AC, 380 V, 50 Hz electrical network.

By special order electrical machines can be supplied with other characteristics.

The machines are equipped with electrical devices that feature reliable performance and ease of use.

Electric motors, mounted on the machine tools, have a reduced vibration.

Control of machine drives is remote-button.

Main drive

Main drive of the machines is carried out by DC motors.

Speed control is performed in the range of 1:5 with constant power. The control circuit provides a quick and smooth acceleration of the main drive to the set speed.

Braking is intense, smooth.

Start, variable speed and stopping are carried out from the buttons on the console in the workplace.

Monitoring of load and change of the main drive rotation speed is done by devices installed in the workplace.

Inquiry