Horizontal double-spindle lathes with CNC series PAB: models PAB-130 and PAB-160

Intended for processing of such parts as flanges, bushes, gears, bearing rings, etc. Processing is executed either in sequence (two sides of the same part) or as two parallel processes. This way full part processing is accomplished without intermediate transportation and storage. Main application area is commercial mechanical-engineering. Double-spindle lathe occupies smaller space and contains fewer elements than two single-spindle lathes.

Assembling features

The lathe consists of the two spindle heads installed at the opposite positions with a slide rest in-between. The slide rest based on the angled bed moves between the two spindles placed horizontally at the same level. Control is carried out by the 2 linear axes X and Z (spindle axis C can be also used if necessary) with sequential switching between the left and the right spindles. This allows to simplify (and reduce price for) the structure of the control system. While part processing is carried out on one spindle, load-unload process is done at the other one. Consequently, processing time is reduced and the yield is practically doubled. Option of installation of the transfer system for the rough part from the first spindle to the second one is available and allows part processing on both sides. Thus, one lathe produces fully processed parts without additional resetting, transfers, and storage.
 

Component parts

Control system - SIEMENS SINUMERIK 802D, drives – digital SIMODRIVE 611 UE. Electrical equipment SCHNEIDER. Pneumatics KAMOZZI, FESTO.
Processing is done in the automatic cycle. Control programs can be entered directly from the control panel or can be downloaded from the computer through the serial interface.
Cutting speed is kept constant.
Spindle cradles are installed at the high-precision angular-contact bearings by the following scheme: three bearings in the front cradle with axial locking of the spindle and two bearings are in the back cradle. Life-long lubrication of the spindle bearings is carried out by paste lubricant.
Slide rest’s design ensures convenient allocation for part processing on the left as well as on the right spindles. Hard steel guard rails together with the polymeric cover (filled fluorine plastic) of the skids ensure high durability and precision of the slide rail. Slideway bearings can be installed. Slide rest is equipped with automated metered lubrication system.
 

Loading and Unloading of the Parts

Left and right spindles are equipped with the manipulators responsible for unloading of the part from the holder after processing and for loading of the new part from the pan. The lathe is equipped with the special built-in transport system for transfer of the parts from one spindle to the other one. Engineering design of the manipulators and the transport system ensure fast readjustment for the wide range of parts’ sizes.
 

Tool setup

Quick-change tool holders with preliminary retooling out of the lathe ensure minimal losses related to the cutting rim exchange.
Along with traditional lathe work the lathe is equipped with all possible kinds of power tools, which significantly improves technological abilities.
In this case the lathe gains ability of the processing center for all-round lathe work for parts with apertures located outside of the part’s rotation axis, and for parts with complex surfaces including complex geometry.
 

Additional capabilities

Various elements and systems that can provide additional precision, reliability and improve technological abilities can be added to the lathe:
Control system of the cutting rim with the contact sensor;
Control system for failure and blunting of the cutting rim; slideway bearings;
Linear drives and linear transducers; spindle-engine; and others.
Additional installation of drilling and milling mechanisms or capstan heads with rotating instruments allows all-round drilling, milling and lathe processing of the part.