Page 7 - Stanochny park

NEWS METALWORKING EQUIPMENT
AND TOOLS
Labor chervontsy went into series Spark plasma sintering of tool

materials

At the initiative of the Ural trade unions, a metallurgist was immortalized on
coins When blade machining of difficult-to-machine steels
The first commemorative coin from the ''Man of Labor'' series was put into circulation by and alloys, the problem arises of choosing a tool material
the Bank of Russia. (TM) with an improved composition, taking into account
the peculiarities of the cutting process. One of the most
The 10-ruble starter coin is dedicated to metallurgy workers. important indicators of TM in this case is the increased
''My colleagues and I pushed this idea for six years, and now it has been implemented. heat resistance, which in modern mechanical engineering
In total, according to the idea, there will be ten coins with ten professions'', said Andrey is achieved by applying a multifunctional nanostructured
Vetluzhskikh, deputy of the State Duma of the Russian Federation, chairman of the Federation wear-resistant coating on a substrate with increased heat
of Trade Unions of the Sverdlovsk Region. resistance.
In 2014, at the congress of the interregional public movement ''In Defense of the Working The practice of producing products from difficult-to-
Man'', employees of the Magnitogorsk Iron and Steel Works offered to issue commemorative machine materials has shown that their workability increases
coins depicting representatives of working professions. The first sketches were created within when nanocrystalline composites are used as TM, which include
a year, and a vote on the choice of professions took place. However, the idea was implemented
only now. grains of the nanometric size range.
One of the methods to ensure the Upper electrode
preservation of the primary grain punch
size of the sintered powder is the SPS-press
use of spark plasma sintering (SPS).
The equipment diagram for the SPS
process is shown in Fig. 1
It includes a module with a Upper punch
vertical uniaxial SPS press and a
water-cooled production module; Sintering matrix SPS - pulse DC generator SPS - controller
special mechanism that allows current Vacuum and water cooling chamber Powder
to pass; a vacuum chamber cooled Lower punch
with water; controller of pressure Lower electrode punch
and composition of the atmosphere; Positioning
vacuum unit; special D.C. generator Operating mode (vacuum, air
for sintering and current pulse and argon)
controller. Water cooling
Powder materials are placed Thermometer
between the die and the punches
during sintering in the chamber. Fig. 1. Schematic diagram of the ISP equipment
Electric current is supplied to the
punches through electrodes and
This year, the Central Bank plans to launch another coin of the new series. All ''labor pressure is applied. When a force P is applied, creating pressure,
chervontsy'' will be legal means of cash payment on the territory of the Russian Federation and and the passage of electric current pulses, the temperature in the
must be accepted at face value without restrictions. sintering matrix rises to 1000 ... 2500 ° C.
The resulting ultradispersed TM has a balanced ratio of
''hardness - density - strength'', which has a positive effect on
wear resistance under the action of cyclic thermomechanical
stresses typical for the processing of heat-resistant alloys.
Text: Svetlana Dobrynina
One of the technological tasks of obtaining ultradispersed
rg.ru TM is to determine the optimal, as low as possible, sintering
temperature in order to minimize residual stresses and
shorten the sintering time.
To solve this problem, experiments were carried out to
obtain an analogue of VK6 grade hard alloy from a mixture of
CREATE A BETTER FUTURE WC (94 wt. %%) and Co (6 wt. %%) nanopowders by the SPS

TOGETHER WITH OUR CUSTOMERS method at temperatures from 1000 to 1500 ° C.
Fig. 3 shows a graph of the dependence of the hardness
and density of the obtained samples depending on the sintering
Fig. 2.Graph of the dependence of the
hardness (1) of the samples and their
density (2) on the sintering temperature.
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