For Shafts & Sleeves

NPF-120N centering and turning machine by Afm is designed for high-performance two-sided machining of the ends and ends of “shafts” and “sleeves” type parts in the following treatments: forehead planning, making center points, coated with short rollers, drilling holes, boring holes, external and internal chamfering.

Technical characteristics of the machine tool.

Afm NPF-120N is designed for highly efficient double-sided machining of faces and ends of parts such as “rollers” and “sleeves” in the following operations:
forehead planning;
making holes;
rolled with short rollers;
drilling holes;
boring holes;
external and internal chamfering.
The machine tool has a short changeover time, which enables the economical processing of parts produced in medium and large series.
The work of the machine tool consists of the simultaneous processing of the ends of the workpiece using multi-blade tool heads mounted on the spindle ends of the machining units, which are driven by an electric motor through a multi-groove belt allowing for quiet and vibration-free operation of the machine, and the feed movement is carried out by AC motors with step-less speed control. The drive of the engines is transmitted directly to the rolling screws.
The machine tool works in an automatic cycle, and only the activities related to inserting the object into vices and removing it after machining are performed manually.
The machine tool is equipped with interlocking movements as well as locks for covers and covers.
The machine tool is controlled from the central control panel on the right side of the machine tool.

Processing units

Machining units are designed to give rotary and feed motion to the tool heads. Their design is completely unified. The processing unit is attached to the bed by means of clamping feet and adjusted by a trapezoidal screw. The adjustment is done manually with a crank. The spindles are driven by 7.5 kW AC motors with step-less speed control. The drive from the engine is transferred directly to the spindle by a belt transmission with a multi-groove belt, which allows for quiet and vibration-free operation of the machine tool.

The spindle is mounted in the front node by three precise 7020 angular contact ball bearings, and in the rear node by a roller bearing NN 3019.
For the drive of the supports (to which the machining units are bolted), with which the feeds are realized, ball screw gears are used, the drive of which is carried out by AC motors with step-less speed control. The drive of the engines is transmitted via clutches to the rolling screws.

High-class ball screws used to drive the supports to ensure backlash-free operation with high accuracy. The shifts are numerically limited by limit signals.
The guides are lubricated by drip feeders supplied by the lubrication system, ensuring the appropriate doses of oil given at a specific time. The appearance of pressure in front of the dispensers is controlled by a pressure transmitter and signaled to the logic of the machine.

Bed

The bed is an element that connects the machine tool into one compact unit. It is made in the form of a ribbed box welded unit. In the upper part, it has flat ground guides along the entire length. In order to ensure proper chip flow, the bed in the middle has a suitably shaped drop channel.

Vices

The right and left vice are a completely unified structure and are used for three-point clamping of workpieces. Changing the vices on the bed guides is done manually by turning the shaft (with a key) on which the toothed wheel is mounted, which rotates on the rack screwed under the bed guide. The vices are mounted on the bed guides by means of a clamp. The vices are equipped with clamping jaws for three-point clamping, workpiece rests and safety devices that protect the operator’s hands against injury. The vice jaws are hydraulically driven. The clamping of the workpiece is controlled by a pressure relay.
The clamping force of the workpiece is regulated by a pressure-reducing valve mounted on the central hydraulic unit.

Hydraulic power pack

The hydraulic power pack has an oil tank with a capacity of 40 dm3. The PSU is equipped with a pump-motor drive unit. The oil is forced by the V3 vane pump, through the pressure filter, to the feeder block. The pressure is set directly on the pump and the pressure is measured with a pressure gauge. The nominal oil pressure in the hydraulic system is 3.5 MPa, and the maximum is 6.0 Mpa.

Lubrication system

The lubrication system has a tank with a capacity of 2 dm3. Provides lubrication of sliding surfaces of slides and ball screws. Lubrication takes place in the inflow, impulse lubrication system, from time to time, in strictly defined doses/portions. The amount of oil supplied is regulated by a knob on the lubricating unit. Grease is used to lubricate the spindle bearings and the ball screw bearings.

Cooling system

The cooling system consists of a tank, electro-pump, installation, bathtub, and covers. The coolant is poured into the reservoir to the maximum.