NEW-TYPE SOVIET ABRASIVE WHEELS

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00809A000700150222-7
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 4
• Document Creation Date: December 22, 2016
• Document Release Date: September 13, 2011
• Sequence Number: 222
• Publication Date: December 2, 1953
• Content Type: REPORT

Sanitized Copy Approved for Release 2011/09/13: CIA-RDP80-00809A000700150222-7
CLASSIFICATION CONFIDENTIAL
SECURITY INFORMATION
CENTRAL INTELLIGENCE AGENCY REPORT
INFORMATION FROM
FOREIGN DOCUMENTS OR RADIO BROADCASTS CD NO.
COUNTRY USSR
DATE OF
rsacnine tools, grinding
wheels, tools, abrasives
uuiiy newspaper
WHERE
PUBLISHED Moscow
DATE
PUBLISHED May 1952, 29 Jul 1953
LANGUAGE Russian
BLACK SILICON CARBIDE WHEELS FOR GRINDING HARD-ALLOY TOOLS -- Moscow, Stanki
i Instrument, May 52
Hard-alloy tools are ground well with grinding wheels made of green sili-
ca i carbide.
Research and operation under production conditions have shown that herd-
alloy tools can also be ground with wheels made of black silicon carbide. The
quality of grinding corresponds to the seventh or eighth class of surface fin-
ish. Cracking or searing is nonexistent.
The expediency of using these wheels is that one ton of black silicon
carbide costs 1,200 rubles less than a ton of green silicon carbide.
In grinding VK3, VK6, VKtI, T5Kl0, and T15K6 hard-alloy tipped tools with-
out a coolant, best results are obtained i= the black siliccr, carbide wheels
have a grain size of 46, and hardness of M2 or M3.
In grinding with a coolant, the possibil - ties of using F;rindi'1~; wh=elr
made of black silicon carbide increase considerably; hard alloys 'f3LK4 and
x601:6 can b, ground with them.
The use of a coolant increases the rroduct,i?.'ity of griedir.G c;,
percent as a spared with dry grinding, and improves the surface finish i, en
average ,f one close. A 3-5 percent emulsion or 5 percent su;i solution
must be used for tr- coolant. The coolant is fed in a continuous j--r at L.
rate of C-8 liters per .rinutc.
Figure 1 / opended7 gives data on the productivity of grinding voriu-:,
hard alloys with wheels made of green and black silicon carbide at a wheel
speed of 12-14 meters per second, depending on the cross feet,;.
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 Sanitized Copy Approved for Release 2011/09/13: CIA-RDP80-00809A000700150222-7
Grinding was done with wheel 46MZ Lsic 461,135. without a coolant. Anal-
ogous interdependencies were obtained in grinding with the use of a coolant.
According to the graph, the productivity of grinding with a black silicon
carbide wheel is somewhat higher than with a green silicon carbide wheel.
It was determined by observation that an increase in productivity ceases
when the cross feed exceeds 0.06 millimeter and the peripheral speed exceeds
20 meters per second. The best results in both productivity and surface
quality are obtained in grinding with a longitudinal feed in the range of
1.0-1.5 meters per minute.
The table below gives data on the surface finish obtained with wheels of
different designations and at various cross feeds:
Designation Type of
of Cross Feed
Hard Grinding (mm/double strokes)
Wh
l
ee
s Alloy Conditions
I VK3
With coolant
Without
coolant
Without
coolant
Without
coolant
Without
coolant
KZ46sM1 T15K6
KCh46sM1 T15K6
KZ80$M1 T15K6
With coolant
Without
coolant
Without
coolant
Without
coolant
0.02
0.03
0.04
0.05
0.06
1.0
1.05
1.05
1.1
1.2
1.1
1.2
1.3
1.5
1.75
0.8
0.85
0.90
1.05
1.20
1.1
1.15
1.20
1.35
1.45
0.60
0.75
0.90
0.95
1.00
0.80
0.83
0.85
0.90
0.95
1.5
1.6
1.65
1.60
1.95
1.20
1.23
1.25
1.40
1.50
1.30
1.40
1.50
1.70
1.85
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CONFIDENTIAL
Sanitized Copy Approved for Release 2011/09/13: CIA-RDP80-00809A000700150222-7
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of Hard Grinding (mm/double'strokes)
Wheels Alloy Conditions 0.,12 0.03 0.04 0.05 0.06
KCh20SMl With coolant 0.55 0.65 0.70 0.80 0.90
jic; KCh8cM17 T15K6 Without
coolant 1.00 1.1 1.2 1.30 1.45
AOTE: Height mean square is gi- i in microns.
Wheels made of black silicon carbide produce a better surface finish than
wheels made of green silicon carbide.
Figures 2 and 3 L ppende] show the life of wheels made of black and green
silicon carbide of different hardness.
Research work on wheels made of black silicon carbide has shown that by
conforming to the above-specified conditions, they can be used successfully in
grinding single-carbide hard alloys and certain types of two-carbide alloys,
for example, T5K1O and T15K6. -- B. S. Korshunov and L. K. Petrosyan
FLEXIBLE GRINDING WHEELS SAVE TOOL METAL, INCREASE LABOR PRODUCTIVITY -- Moscow,
Komsomol'skaya Pravda, 29 Jul 53
Flexible grinding wheels are being used successfully in Soviet industry for
grinding curved grooves 1-2 millimeters wide.
In making flexible grinding wheels, a piece of crude rubber is softened
between rollers. An abrasive powder is sprinkled and intermixed with the rub-
ber, after which this mass is rolled and cut in circles. Depending on the pur-
pose for which the wheel is to be used, its thickness ranges from several milli-
meters to 2-3 centimeters. The wheel is placed on a an and put in a vulcanizing
furnace at a temperature of 70-80 degrees /centigrade/ for 30 minutes. When it
emerges, it is a strong, flexible, and elastic rubber with grains of abra:>ive
powder virtually "soldered" in it.
Drills, taps, milling cutters, and other tools in which flutes and grooves
have been ground with flexible wheels operate better and last longer than those
ground with ordinary wheels. This new type of grinding tool is making it pos-
sible to save expensive tool metal and increase labor productivity.
These wheels are being used very extensively in grinding irregularly shaped
parts. For example, the body of passenger cars is ordinarily finished with
emery cloth before painting. Areas that are not easily accessible with emery
cloth are now ground with flexible grinding wheels. `"ge 4, for
earlier report on flexible grinding wheels.,'
Appended figures follow./
-3-
CONFIDEN'TIAL
50X1-HUM
Sanitized Copy Approved for Release 2011/09/13: CIA-RDP80-00809A000700150222-7
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= ,rcr
---KZ
i
YZS
T66K6
TiMS TIM
40 del ee, ee noels.
KCh - Black silicon carbide wheels
KZ - Green silicon carbide wheels
'VRJ KZ86n
VK3 Kch80t
50X1-HUM