Zhuzhou Cemented Carbide Cutting Tools Co.,Ltd. ( ) is a subsidiary company of Zhuzhou Cemented Carbide Group Corp.Ltd.(zcc), located in Hunan province, China. With 60 years experience in the manufacture of cemented carbide products, a team of enthusiastic design engineers, and the world's most advanced technology and equipment, has created the perfect combination required to lead China in the production and distribution of highly productive, superior quality carbide cutting tools long into the future. History of • 1954 - Zhuzhou Cemented Carbide Works founded cemented carbide production in China. • 1988 - Introduced advanced technology and equipment to produce high precision indexable cemented carbide inserts for metal cutting. • 1992 - Solid carbide cutting tools and end mill production line were started with the introduction of international technology and equipment. • 2002 - Zhuzhou Cemented Carbide Cutting Tools Co Ltd.was founded. Cemented carbide indexable insert production line, and solid carbide cutting tool production line were transformed by the introduction of advanced technology and processing equipment sourced from respected international suppliers. The research and development section was enhanced through the introduction of an ever-growing team of highly skilled engineers working full time to improve and expand the range of solid carbide cutting tools, indexable inserts, and toolholding systems. • 2005 - Further introduction of advanced technology and equipment for the production of ceramic inserts adds another dimension to Research and Development A highly trained R & D staff work hard continuously in the field of cutting tool substrate material development, coating material technology, and insert chipbreaker design. They also conduct testing and evaluations of newly designed tools prior to market introduction. ’s research & development center is the most advanced and modern scientific research base in China for promoting the development of cemented carbide cutting tools. Brief introduction
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Zhuzhou Cemented Carbide Cutting Tools Co.,Ltd. ( ) is a subsidiary company of Zhuzhou Cemented
Carbide Group Corp.Ltd.(zcc), located in Hunan province, China.
With 60 years experience in the manufacture of cemented carbide products, a team of enthusiastic design engineers, and
the world's most advanced technology and equipment, has created the perfect combination required to lead
China in the production and distribution of highly productive, superior quality carbide cutting tools long into the future.
History of
• 1954 - Zhuzhou Cemented Carbide Works founded cemented carbide production in China.
• 1988 - Introduced advanced technology and equipment to produce high precision indexable cemented carbide inserts for
metal cutting.
• 1992 - Solid carbide cutting tools and end mill production line were started with the introduction of international technology
and equipment.
• 2002 - Zhuzhou Cemented Carbide Cutting Tools Co Ltd.was founded. Cemented carbide indexable insert production line,
and solid carbide cutting tool production line were transformed by the introduction of advanced technology and processing
equipment sourced from respected international suppliers. The research and development section was enhanced through
the introduction of an ever-growing team of highly skilled engineers working full time to improve and expand the range of
solid carbide cutting tools, indexable inserts, and toolholding systems.
• 2005 - Further introduction of advanced technology and equipment for the production of ceramic inserts adds another
dimension to
Research and Development
A highly trained R & D staff work hard continuously in the field of cutting tool substrate material development, coating
material technology, and insert chipbreaker design.
They also conduct testing and evaluations of newly designed tools prior to market introduction.
’s research & development center is the most advanced and modern scientific research base in China for
promoting the development of cemented carbide cutting tools.
Brief introduction
ContentsA
B
C
D
E
F
● This catalog shows basic types of standard series inserts and cutting tools. If you have any questions or feedback, please feel free to contact our Sales Department. We will try our
best to satisfy you.
● All information in this catalog relates to current products. We will improve our products as our technology develops.
● All technical data in this catalog is prescribed for given working conditions. Please use it as a reference for your own working conditions.
GENERAL TURNING TOOLS
PARTING, GROOVING TOOLS
THREADING TOOLS
MILLING TOOLS
SOLID CARBIDE CUTTING TOOLS
INDEXABLE INSERT SHORT HOLE DRILLS
P1-107
P108-129
P130-169
P170-265
P266-301
P302-313
TurningP2-6
P7
P8-11
P12-23
P24-25
P26-52
P53-66
P67-77
P78-79
P80-87
P88-89
P90-100
P101
P102-107
GENERAL TURNING TOOLSOverview of turning inserts/tools
Table of recommended grades for turning
Introduction of chip-breakers in turning operations
Recommended chipbreaker for finishing P-kind materialsDouble-side chipbreaker with M-class tolerance for finish machining carbon and alloy steels.
Recommended chipbreaker for fine-finishing P-kind soft steelDouble-side chipbreaker with M-class tolerance has outstanding performance on machining Pkind soft steel and medium-carbon steel to ensure high surface quality.
Recommended chipbreaker for finishing M-kind materialsDouble-side chipbreaker with M-class tolerance with sharp edge for machining stainlesssteel to reduce built-up edge and work-hardening, while improving surface finish.
Recommended chipbreaker for finishing S-kind materialsDouble-side chipbreaker with E-class precision, for holding close tolerance when indexing.Wear resistance and work hardening resistance combine to achieve high maching precision.
General chipbreaker with wiperDouble-side chipbreaker with M-class tolerance designed with wiper to achieve goodsurface finish at higher feed rates.
Recommended chipbreaker for semi-finishing P-kind materialsDouble-side chipbreaker with M-class tolerance reduces cutting force and workpiece adhesion,with a broad chipbreaking range for machining alloy steel.
Recommended chipbreaker for semi-finishing P-kind materialsDouble-side chipbreaker with M-class tolerance has higher toughness on cutting edge thanDM chipbreaker. It’s suitable for semi-finishing under unfavorable conditions. Also good formachining cast iron with low cutting force.
Recommended chipbreaker for semi-finishing S-kind materialsDouble-side chipbreaker with M-class tolerance with good capability to prevent wear and work-hardening when machining low-machinability rated metals.Possesses higher feed and depth ofcut capability than NF chipbreaker.
Recommended chipbreaker for semi-finishing M-kind materialsDouble-side chipbreaker with M-class tolerance serves to reduce cutting force and workpieceadhesion when machining stainless steel. Possesses higher feed and depth of cut capabilitythan EF chipbreaker.
M
M
M
M
M
M
M
ap=0.012~0.079(inch)fn=0.002~0.014(inch/r)
DF
EF
NF
WG
DM
PM
NM
EM
M
M
E
M
M
M
M
M
SF
Map=0.002~0.039(inch)fn=0.002~0.014(inch/r)
ap=0.002~0.039(inch)fn=0.002~0.012 (inch/r)
ap=0.004~0.039(inch)fn=0.002~0.012(inch/r)
ap=0.012~0.079(inch)fn= 0.004~0.016(inch/r)
ap=0.059~0.197(inch)fn=0.006~0.020(inch/r)
ap=0.059~0.197(inch)fn=0.006~0.020(inch/r)
ap=0.004~0.059(inch)fn= 0.002~0.012(inch/r)
ap=0.020~0.059(inch)fn=0.004~0.012(inch/r)
Introduction of chip-breakers
A
Turning
■ 8
Ligh
t-loa
d ro
ughi
ngH
eavy
-load
m
achi
ning
Cas
t iro
nm
achi
ning
Supe
r har
din
sert
sC
eram
icin
sert
sFo
r rou
ghin
g
Recommended chipbreaker for roughing P-kind materialsSingle-side chipbreaker with M-class tolerance has high security on cutting edge for higherremoval rates and low cutting force at large cutting depth and high feed rates.
Recommended chipbreaker for heavy-load machining P-kind materialsSingle-side chipbreaker with M-class tolerance has high strength and security on cutting edge,with strong capability to prevent plastic-deformation under high metal removing rate.
For machining cast ironDouble-side with M-class tolerance has high cutting edge strength to effectively machine throughworkpiece imperfections, such as sand pockets in cast iron.
For machining non-ferrous metal and high-hardness materialG-class tolerance is the best choice for machining nonferrous metals with high-hardnessmaterials by soldering PCBN and PCD onto cemented carbide substrate.
For machining hardened steel, cast iron and steelCeramic inserts with double-side G-class tolerance for machining various materials such ashardened steel, cast iron and steel with various cutting edge treatment.
M
M
M
Recommended chipbreaker for light-load roughing of P-kind and K-kind materialsDouble-side chipbreaker with M-class tolerance for light roughing, higher metal removal rate,and greater cutting edge security.
Double-side
Single-side
Single/Double side
DR
DR
ER
HDR
M
M
M
M
M
G
G
Withoutchipbreaker
(flat top)
Withoutchipbreaker
(flat top)
Withoutchipbreaker
(flat top)
For machining P-kind, M-kind, K-kind materials from semifinishing to roughingDouble-side chipbreaker with M-class tolerance has good cutting edge toughness with wideapplication area. Unfavorable chip control compared to dedicated chipbreakers.
Recommended chipbreaker for roughing M-kind materialsSingle/Double side chipbreaker with M-class tolerance has good impact-resistance.Thechipbreaker's cutting edge is designed to balance security and sharpness.High performance isachieved by reducing edge build-up and reducing heat when roughing stainless steel.
Negative inserts with a hole
Application
ChipbreakerPrecision Recommended
cutting parameters Feature/Shape of insert
Introduction of chip-breakers
A
Turning
9 ■
For e
xtra
fini
shin
gFo
r sem
i-fini
shin
gFo
r fini
shin
g
First choice for finish machiningG-class tolerance is recommended for precision finishing.
Chipbreaker for finishing with wide applicationWith M-class tolerance suitable for internal and external finishing machining for variousmaterials such as steel and cast iron etc.
Recommended chipbreaker for finishing M-kind materialsM-class tolerance; sharp cutting edge suitable for finishing materialsas stainless steel and softsteel, etc. where edge build-up is problem.
Chipbreaker for semi-finishing with wide applicationM-class tolerance; suitable for boring and o.d. semi-finishing materials, like steel and cast ironetc.
Recommended chipbreaker for semi-finishing M-kind materialsM-class tolerance; higher toughness on cutting edge than EF chipbreaker for higher feed anddepth of cut.
For r
ough
ing
For A
l mac
hini
ngSu
per h
ard
inse
rts
General chipbreaker for roughingM-class tolerance; suitable for both boring and o.d. roughing materials as steel,stainless steeland cast iron etc.
Chipbreaker for machining AlG-class tolerance, large rake angle and large clearance angle combine for positive cuttingaction,with good chip control.
Unique chipbreaker for machining AL alloyG-class tolerance, big rake angle and surface polishing, prevents built-up edge, allowing forhigh surface workpiece quality and long tool life.
For nonferrous metals and materials with high hardnessG-class tolerance; for machining nonferrous metals and materials with high hardness bysoldering PCBN and PCD material to cemented carbide substrate.
M
M
M
M
M
M
M
M
M
M
M
M
SF
HF
EF
HM
EM
HR
LC
LH
G
M
M
M
M
M
G
G
G
Withoutchipbreaker
(flat top)
ap=0.002~0.039(inch)fn=0.002 ~0.012(inch/r)
ap=0.004~0.079(inch)fn=0.002~0.012 (inch/r)
ap=0.004~0.079(inch)fn=0.002~0.012 (inch/r)
ap=0.039~0.157(inch)fn=0.008~0.020(inch/r)
ap=0.039~0.157(inch)fn=0.008~0.020(inch/r)
ap=0.118~0.276(inch)fn=0.012~0.028(inch/r)
ap=0.02~0.189(inch)fn=0.002~0.020(inch/r)
ap=0.004~0.315(inch)fn=0.002~0.016(inch/r)
ap=0.002~0.020(inch)fn=0.002~0.012(inch/r)
Positive inserts with a hole
Application
ChipbreakerPrecision Recommended
cutting parameters Feature/Shape of insert
Introduction of chip-breakers
A
Turning
■ 10
Positive inserts
Negative inserts
Main chip breaking range reference for general turning inserts
Smooth coating surface results in less friction and
easier chip flow.
Special Nano structure coating ensures higher
toughness, hardness, and bonding to substrate.
Thermal and chemical stability of coating allow cutting
edges to remain reliable throughout cut.
nc—TiAIN coatingCommon TiAIN coatin
g
For parting, grooving and the machining
of difficult to machine materials.
At the Cutting Edge of Grade
and Coating Technology
■ 12
The perfect combination of fibrous TiCN and fine grain Al2O3 obviously improves abrasion resistance and anti-breakage of inserts.
Roughness of insert surface is improved after special treatment on surface, which effectively reduces cutting forces, prevents workpiece adhering to surface of inserts and improves operation stability of inserts.
Cemented carbide substrate
TiCN
Al2O3
Workpiece material :45#steel
Inserts:CNMG432-DM
Cutting parameters:Vc=1300SFPM
ap=0.04(inch) fn=0.008(inch/r)
Test comparison of inserts abrasion
Grade from other company YBC152
8min 8min16min 16min
Perfect unification of toughness and anti-plastic deformation.Specially designed cutting edge with “skeleton” realizes perfect unification of toughness and anti-plastic deformation.
Comprising of thick TiCN and thick Al2O3 coatings, the grade has high capability against plastic deformation and good hardness of cutting edge. It is preferred grade for machining of steel from finishing to roughing. Under the same cutting conditions, the cutting speed can be increased by more than 25%, while the tool life can be 30% longer under the same cutting speed.
Thick TiCN and thick Al2O3 coatings improve the impact toughness and abrasion resistance, which makes it suitable for finishing and semi-finishing of steel at high speed. Cutting speed can increase by more than 25%, while the tool life can increase by more than 30% at the same cutting speed.
Coated Cemented Carbide CV
DSecond generation of
Achieving both higher cutting speed and longer tool life
YBC
After surface treatme
ntBefore surface treatme
nt
YBC152
YBC252
13 ■
The combination of thick coating and substrate with good hardness and impact resistance gives the inserts excellent impact resistance and stability under high temperature, and improves wear resistance of inserts. Inserts also satisfy the requirements of high speed and high feed rate when machining cast iron.
The appearance of shining full black is easily identified.
Significant results
Working efficiency has been improved. Both the coating and the substrate are suitable for machining cast iron at high speed and high feed rate. Cutting speed can be increased by 30% to 40%.Cost is reduced as tool life is increased by 40%-50%.High machining stability.
CVD coated grade, which is characterized by super fine grain and smooth surface, is the combination of hard substrate and coating (extra thick Al2O3 + thick TiCN ). The grade is optimized for best wear resistance when machining gray cast iron at high speed under dry condition.
CVD coated grade, which is the combination of hard substrate and coating (medium thick Al2O3 + thick TiCN), has good flaking resistance. It is suitable for turning of cast iron at high speed, and light intermittent cutting can be supported even at moderate speed. It is also suitable for milling of cast iron.
CVD coated grade, which is the combination of hard substrate and coating (thick Al2O3 + thick TiCN ), shows excellent wear resistance and impact resistance when machining nodular cast iron at high speed.
CVD coated grade, which is the combination of hard substrate and coating (medium thick Al2O3 + thick TiCN), achieves the balance between wear resistance and toughness. It is suitable for wet milling of cast iron, which requires toughness (such as nodular cast iron) at moderate or low speed. It is also suitable for intermittent turning.
YBD052
YBD102
YBD152
YBD252
Layer of fi ne grain with compact surface
First choice for high-efficiency and highspeed machining of cast iron
YBD
Coated Cemented Carbide CV
D
■ 14
YBC151Substrate with special structure, in combination with Ti(CN), thick layer AI2O3, and TiN coating. High resistance to diffusion of rake face and resistance to plastic deformation it is good for finishing and semi-finishing (turning as well as boring) of stainless steel.
YBC251Coated carbide grade with special strength and toughness, in an optimal combination with MT-Ti(CN), thick layer AI2O3, and TiN coating. Suitable grade for wide application. It is recommended for the finishing, semi-finishing and light roughing of steel, cast steel and stainless steel.
YBC351Substrate with high strength and resistance against plastic deformation,in combination with MT-Ti(CN), thick layer AI2O3,TiN coating.It is suitable for light roughing and roughing steel,cast steel and stainless steel.
YBM151Substrate with special matrix, in combination with Ti(CN), thick layer AI2O3, and TiN coating. With the resistance to rake face diffusion and plastic deformation, it is good for finishing and semi-finishing (turning as well as boring) of stainless steel.
YBM251
YBM253
Substrate wi th good toughness and strength, in combination with Ti(CN),thin layer AI2O3, TiN coating, It is a premium grade for semi-finishing to light roughing (turning and boring) of stainless steel at continuous and intermittent machining conditions.
Ideal grade for turning of stainless steel with high cutting depth and high feed rate under bad working condition.● Ultra-fine grain coating technology provides better wear resistance and toughness;● Improved remain internal stress design ensures good toughness and anti-cracking performance;● Polishing treatment on coating surface makes it suitable for cutting adhesive materials.
YBD151Substrate with very good wear resistance, in combination with MT-Ti(CN), thick layer AI2O3, TiN coating. It is the first choice for medium to rough machining of cast iron, nodular cast iron at high cutting speed.
YNG151TiCN based cermets, of which the grains are refined with a special process with more even grain size. The combination of cemented carbide hard phase and the binder phase is even more strengthened, further improving the wear resistance and Iifetime of the inserts. They are suitable for the finishing and super finishing of steeI, stainless steeI and cast iron.
YNG151CTiCN based cermets+Nano PVD coating, of which the surface is specially pre-treated with an even and smooth surface. The friction coefficient of the workpiece in relation to the insert is reduced, causing good chip flow, increased wear resistance, and prolonged Iifetime of insert. They are suitable for the finishing and fine finishing of steel materials, stainless steel and cast iron.
Main grades and applications
15 ■
YC10Carbide grade with high hardness and good toughness, suitable for fine and semi-finishing machining of steel and cast steel, also suitable for profile turning.
YC40Carbide grade with excellent toughness and wear resistance,is suitable for the heavy duty cutting of steel and cast steel.
YD101Carbide grade with fine size grain. Good for fine and semi-finishing machining of cast iron and nonferrous metal. Particularly for machining of Aluminum.
Uncoated carbide grade with good wear r e s i s t a n c e a n d t o u g h n e s s . S u i t a b l e forroughing and semi-finishing of cast iron and heat resistant alloys, and nonmetallic materials such as plastic and wood. Specially used in aviation industry with sharp edges inserts. Medium cutting speeds and high feed rates are recommended.
YD201
YCB011With a higher content of PCBN, this grade possesses good wear resistance and higher strength.The chemical and thermal stability of PCBN make it suitable for high-speed and high precision machining of cast iron, heat resistant alloys, Fe-basedpowdered metal materials. Cutting speeds of almost 5000 sfpm can be attained in machining gray cast iron.lt can also be used for finish machining of hardened steel.
YCB012YCB012 is of fine grain sizes with a lower PCBN content. The fine grain structure provides the cutting edges with excellent quality. The inserts of this grade are most suitable for the continuous and slightly intermittent finishing of hardened steel(HRC45-65).lt can also be used for the finishing of materials falling into the category of cast iron.
YCD011YCD011,super hard PCD inser ts o f a medium gra in size(10μm),are characteristic of high hardness,excellent wear resistance,Iow friction coefficient and outstanding heat conductivity. They are suitable for the machining of non-ferrous metals(for example,AI,Cu,high-silicon aluminum alloys and Mg,Ti,etc.)and non-metals(for example,glass fiber, ceramics,reinforced wooden floors and plastics,etc.).It is a kind of PCD inserts for universaI applications.
■ 16
CN1000Substrate is Si3N4. Feature performance is resistance to cutting edge cracking and thermal shock.Recommended for fine and medium finishing, and also heavy and interrupted cutting of gray cast iron.
CN2000Substrate is Si3N4. It has characteristically very good wear-resistance and excellent toughness. It's a premium grade for intermittent and continuous machining of steel and gray cast iron, and also for machining die tool steel and other wear-resistant materials.
CA1000Substrate is composed of Al2O3 and TiCN. It exhibits good wear-resistanceand a secure cutting edge. It is suitabIe for continuous machining of hardened steel and nodular cast iron.
YBG102
YBG202
YBG205
YBG302
YBG201
It is a combination of 2-4μm nc-TiAIN coating and fine carbide substrate. It is especially suitable for machining cast iron from light to medium load and turning of high-temperature alloys from finishing to semi-finishing.
A combination of 2-4μm nc-TiAIN coating and ultrafine gra in carb ide subst ra te wi th h igh s t rength and toughness...suitable for light to medium milling, and boring of all kinds of materials. Recommended for finish and semi-finish turning of stainless steel and roughing turning of high-temperature alloys.
Unique grade material with near perfect wear resistance and high temperature resistance. The nc-TiAlN coat ing, u l t raf ine grain substrate, and unique surface treatment make this grade suitable for high precision cutting of "difficult to machine"materials, such as stainless steel, etc.
A combination of 2-4μm nc-TiAIN coating and a tough substrate. It is suitable for medium general purpose milling, boring, andparting and grooving of all kinds of materials. Suggested for semi-finishing to roughing of stainless steel. I t achieves perfect combination of wear resistanceand cutting edge security.
PVD TiN coated grade with good toughness and wear resistance. It is good for threading and drilling(both peripheral and central inserts)low carbon steel, stainless steeI, heat resistance steeI and cast irons.
17 ■
-LC New-generationchipbreaker for Al machining
■ 18
-LC chipbreaker can be used in machining of pure Al, while -LH chipbreaker can not.-LC chipbreaker expand the chip breaking range of Al alloy machining.
Angular cutting edge improves chip flow and control.
Cutting edge segues from nose to main edge without interruption.
■-LH chipbreaker is more suitable for machining aluminum alloy with larger cutting depth and higher feed rate.
■-LC chipbreaker is more suitable for machining aluminum alloy with smaller cutting depth and lower feed rate.
-LC inserts are designed with a special chipbreaker. Large rake angle and clearance angle allow for sharper cutting edge, ensuring smoother cutting, while controlling chips.
A polished rake face reduces friction and adhesion to cutting tool. Chips are allowed to flow freely across rake face and improve the quality of the workpiece finish.
G-class precision tolerance of insert permits higher accuracy of surface finish and better repeatability when insert is indexed. Machining vibration is reduced also.
–LC and –LH chipbreaker characteristics and machining range
New-generation chipbreaker for aluminum
19 ■
A specially designed double rake angle cutt ing edge satisf ies the need for toughness for roughing, and sharpness for shearing soft and gummy materials, like stainless steel.The tilted edge angle reduces cutting forces and tool wear.
A specially designed rake angle and an inclined edge angle is designed for machining gummy materials with low machinability ratings, like stainless steel. The sharper cutting edges make the cutting attitude light and smooth, obtaining good chip control and good surface quality, for finish machining.
Impact resistance of the cutting edge is strengthened for interrupted cutting.The sharp cutting edges function to shear low machinability rated metals, like 300 series stainless steel, while resisting edge-build-up.
Chipbreakers specially designed for cutting "hard to machine" workpiece materials, like 300 series stainless steels
-EM
-ER
-EF
■ 20
Insert chipbreakers for machining Ni-base high temperature alloys should have strong and sharp edges, a smooth rake face, and a suitable inclined cutting edge angle.
Characteristics of inserts with NF/NM chip-breakers
Inserts with NF chip-breakers have sharp cutting edges & inserts with NM chip-breakers have strong cutting edges
Smooth surface & free flow of chips Good wear resistance Good stability under high temperatures
characteristics of machining Ni-based high temperature alloys
high cutting force high cutting temperature severe insert wear
SolvingSolving problems when machining Ni-basehigh temperature alloys
21 ■
D series chip-breaker
H series chip-breaker
can be used for machining steel from finishing to roughing.
ap(inch)
fn(inch/r)
HM
HR
HF
ap(inch)
fn(inch/r)
DR
DM
PMDF
DF
HF
D
H
DR
HR
P
M
M
M
■ 22
Wiper inserts
Selection of a rational approach angle for the tools The inserts with a wiper land can reduce the surface roughness & it is due to the fact
that the inserts during operations have an auxiliary angle mean to zero. The magnitude of the auxiliary angle however depends on the shape of the inserts the magnitude approach (auxiliary) angle can achieve a national surface finial If the approach (auxiliary) angle is not suitable the Inserts with a wiper land will reduce or lose their effects, for example the approach angle of CNMG/WNMG inserts with a wiper land is 95o that of DNMX/TNMX should be 93o .
Using DNMX and TNMX inserts DNMX and TNMX inserts with a wiper land are not recommended for general purpose machining.
They can not achieve the desired results in machining.
chip-breakers forprecision machining
Uniquely designed finishing chipbreaker with sharp edge and low cutting force; effectively reducing vibration of the tool;
High precision indexability; insert holders specially developed to increase the insert's resistance to vibration; thereby improving workpiece surface quality;
Special rake face treatment of insert reduces chip adhesion during finish machining. Excellent chip control effectively manages chips to improve workpiece finish and reduce machine downtime.
Grades suitable for finishing and super finishing of diverse workpiece materials have been chosen based upon their affinity to the insert chipbreaker.
Wiper Insert Standard Inert LEGENDf-feedr-corner radius rw-wiper radiusRa-surface finish