Description

Since the end of the last century, rotary-type saws developed in Russia have become widespread in metallurgy for cutting hot section steel billets. Rotary-type saws are used to cut workpieces with a diameter of up to **0 mm and profile products. A series of saws were developed, differing in the design of the blade drive - belt RR (РР) and, later, gear РЗ and РЗМ  with cutting blade diameters from ***0 to ***0 mm. More than *0 cutting units with rotary-type saws are operated in Russia and abroad, including Japan, the USA and other countries.

In rotary-type saws, compared to traditional saws, feed rates are increased by an order of magnitude (up to **2 m/s). This was achieved as a result of a complex of studies covering cutting conditions, tool design and saw mechanisms. Let us explain that the tooth of the rotary-type saw blade is in contact with hot metal for thousandths of a second and has time to cool down before it comes into contact with the metal again. The thickness of the removed hot metal shavings is 0.**1.2 mm. In traditional saws, the cutting work is largely spent on the friction that accompanies the cutting process. In rotary-type saws, the friction remains the same, and the deformation forces, although they grow, are within the limits accessible to blades made of carbon steels with small additions of chromium and vanadium (for example, AISI L2/GOST 9ХФ, AISI L3/GOST *5Х, GOST *5ХМФ, EN *1CrV4), with satisfactory durability

A feature of rotary-type saws is the need to perform cutting work at high speeds in a short time with significant amounts of energy required for cutting large-section workpieces. To implement the cutting process in rotary-type saws, the planetary motion of the rotating cutting disk with feed to the cut in the mode of starting the carrier for one revolution is adopted. The energy reserve required for cutting is accumulated in the flywheel accumulator of the cutting blade rotation drive from a separate motor, and the supply to the cut is carried out from the carrier drive motor.

The technical characteristics of the РЗМ****0 rotary-type saw and the requirements for the auxiliary equipment of the cutting unit are shown below in Table 1.

Table 1.

Rotary-type saw

Blade diameter, (nominal), mm ***0

Blade thickness, mm *2

Teeth pitch, mm *0 - **0

Blade material (steel grades) (according to GOST) 9X, *5X, *0XMF, *1CrV4 (EN)

Blade life before grinding, m2 of total section surface area of

bars to be cut **0

Possible number of grinding **5

Possible number of regrinding to minor diameter **3

Blade speed rate per cut, m/s 0.8 ÷ 1.5

Cutting speed (peripheral velocity of blade), m/s *****0

Blade cooling water

Water pressure for blade cooling, atm to *0

Maximum cut cross-section at preset below ultimate resistance:

Circle, mm **0 (**0)

Square with side, mm **0 (**0)

Minimum temperature of the workpiece being cut, 0С **0

Tensile strength of the cut steels at the specified cutting

temperature is not higher, N / mm2 **0

Estimated time between cuts, s *0

Saw dimensions (length, width, height), mm ***0x***0x***5

Saw weight with protective cover and frames, ton *0

Maximum weight of the assembly unit, ton *5 (*0)

Electric motors of drives of rotation of a disk and carrier

Current nature variable

frequency Hz *0 (*0)

Voltage, V **0 (**0)

Blade drive motor capacity, kW *0 (to be specified when ordering)

Carrier drive motor capacity, kW **0 (to be specified when ordering)

Equipment operating conditions

Environmental temperature **0 / + *0 ºС

Humidity without condensate formation, % *5

Temperature inside cabinets with electrical equipment and According to the requirements

 

automation of hardware manufacturers

Working mechanism lubrication system liquid filler

Roller conveyor

Main purpose Transport of workpieces

Emphasis

Main purpose Setting a given length of cut

Positioning accuracy, mm 5 (to be specified when ordering)

Travel speed, mm/s Should provide the specified time between cuts

Lowering speed / lifting speed, s

Clamps

Main purpose Holding and leveling the workpiece while cutting

Travel speed, m / s Should provide the specified time between cuts

As additional information, in Table 3 below, we present data on all standard sizes of РЗМ rotary-type saws with cutting blades from ***0 mm to ***0 mm.

Table 3.

РЗМ****0 РЗМ****0 РЗМ****0 РЗМ****0 РЗМ****0

Workpieces to be cut:

Maximum diameter, mm **0 **0 **0 **0 **0

Sectional area, mm2 ****0 ****0 ****0 *****0 *****0

Temperature, ºС, not lower **0 ° C

Steel grades Carbon and alloy steels with ultimate strength at cutting temperature no more than *5 kg / mm2

Installed power of electric

motors, kW **0 **0 **0 **0 **0

Dimensions, m 2.9x1.9x1.6 3x2.4x1.8 4x3.2x2.6 4.8x4x3.5 6.6x5.6x4

Weight, ton 8.0 *6 *5 *6 *5


If you are interested, we will send you by mail Technical documents with a saw pattern.