Danyang Austin Tools

Diamond Tools -> Select a Diamond Tool

The buyer is solely responsible for the correct selection of correct use of the diamond tools. The claims are invalid in case of incorrect selection or misuse or not observing to safety instructions.
It is the fact that 99.9% of problems are caused by operate error and not product failure. Our blades should not fail if used correctly.

1.What is a Diamond Blade
A diamond blade is composed of the circular steel core and the diamond-impregnated segment. The segments separated by slots in the core. These slots assist in cooling the blade during sawing by allowing water (wet cutting) or air (dry cutting) to flow between the segments.
The segments or rims are a mixture of diamond powders and metal powder. The diamonds are industrial diamonds of different sizes and qualities depending on the material to be cut and blade type. During the process the metal powder and diamond powders are compressed at very high temperature and pressure to obtain the bond, which retains the diamond, grain.

2.How to make a diamond blade
1). Laser Welding: laser micro-fusion enables the segment to be welded to the core. The bond is the most powerful, it enables the tool to be used for dry cutting and drilling without segment loss.
2). Brazing: silver brazing solder melts at high temperature between the segment and the core and binds the two elements together. This used for wet cutting, drilling and grinding.
3).Sintering: It divides into two
A.Cold pressed -Sintered:First pressed with press machine under normal circumstances, then laid in sinter machine under high pressure and temperature making the compressed metal powder to melt to a solid bond.
B.Hot pressed: pressed with hot press machine under high temperature and pressure, making the compressed metal powder to melt to a solid bond.

Processing Method	Binding Strength of the segments (rim) and the steel core
Processing Method	Wet Cutting	Dry Cutting
Laser Welded	++++	++++
Hot Pressed	+++	+++
Brazed	+++	++
Cold Pressed-Sintered	++	++

Process method	Cost	Productivity	Life	Speed	Dry or Wet
Cold pressed Silntered	+	++++	++	+++	wet
Hot pressed	++	+++	+++	++++	Dry or Wet
Laser welded	+++	++	++++	++++	Dry or Wet
Brazed	++++	+	++++	++++	Wet


	Cold Presse	Sintered	Hot Pressed	Laser Welde	Brazed

3.How does a diamond blade work
The individual diamond crystals exposed on the leading edge and the sides of the segment or rim carry out the cutting (in fact it is milling)
The operator pushes the rotating blade into the material. The surface diamonds thus exposed mill a groove in the material, reducing it to fine powder. When the blade mills the material, the latter exerts wear on the blade.
During cutting the exposed diamonds may crack or break. The material simultaneously starts to abrade the metal matrix, which gradually releases more diamonds. The more abrasive the material, the more rapid the tendency to wear down the matrix.
Blades for cutting hard, dense less abrasive materials (such as tile, hard bricks, stone or cured concrete), require a softer metal matrix. This will wear down faster, replacing the worn diamonds fairly quickly so that the blade continues to cut.
Blades for cutting soft, abrasive materials (such as green concrete and asphalt) must have a hard, abrasion-resistant metal matrix in order to retain the diamonds for a long time.

4.How to selecting a diamond tool
When choosing a diamond tool you should follow under step by step:

Step 1 : How to use -Cutting or Drilling or Grinding
Be sure that cutting blade is deadly dangerous to use for grinding and making a hole. You should not take the risk just to save meaningless small money using one blade doing all the work.. Please refer to the detail content in the brochure.

Step 2 : What kind a machine to use on


Cutting Machine	Wall Saw	Tile Saw	Hand Saw	Angle Grinder

Grinding Machine	Cut-off Saw	Concrete Saw	Drilling Machine

Step 3: Blade Usage --How often you will use it and how long a life and how fast a cutting speed you required
a). Professional Purpose: for large civil engineering construction on a regular daily basis, require long life (less expensive per cut/meter) and fast cutting speed.
b).Builder's (contractor ) Purpose: for regular use with medium life, fast cutting speed no need the same life of a professional blade.
c).DIY Purpose (trade): for small scale occasional use, require fast cutting speed and reasonable life .
d).Promotional Purpose: Cut well with water but with short life.

	Professional(Lager scale use)	Builder (Contractor)	DIY(trade)	Promotional
Life	++++	+++	++	+
Cutting Speed	++++	++++	+++	++
Initial Buying Price	++++	+++	++	+
Cost(Meter Per Cut)	+	++	+++	++++

Step 4:Blade Purpose-Consider what materials you to be cut
Asphalt; Concrete; Brick; Block; Stone; Tile or General Purpose(this type can cut many of the materials, but can not get the best performance as special professional ones).
If you want a blade that will cut both granite and asphalt well then you will need to buy two different blades. You cannot expect the blade to work correctly and safely on both materials. The blade will either become blunt and overheat or it will wear very quickly.

Application Chart (Recommend Blade Selection)

Blade Purpose
Cutting Materials	Granite	Tile Marble	Cured Concrete	Abrasive Products	AsphaltGreen Concrete Asphalt over Concrete	General Purpose (Buildilng Materials)	Multi-use Contractors	DIY
Granite	++++					+++	++	+
Engineering blocks	++++		.			+++	++	+
Very hard engineering bricks	++++		.			+++	++	+
Concrete over 50kn	++++					+++	++	+
Clay paviors		++++				+++	++	+
Hard clay pipes		++++				+++	++	+
Ceramic tiles		++++				+++	++	+
Porcelain tiles		++++				+++	++	+
Clay roof tiles		++++				+++	++	+
Marble		++++				+++	++	+
Medium facing bricks			++++			+++	++	+
Hard slate			++++			+++	++	+
Flint concrete			++++			+++	++	+
Concrete kerbs			++++			+++	++	+
Concrete slabs			++++			+++	++	+
Concrete lintels			++++			+++	++
Concrete paviors			++++			+++	++
Soft facing bricks				++++			++
Block paviors				++++			++
Concrete blocks Over 15kn				++++			++
Soft slate				++++			++	+
Concrete roof tiles				++++			++	+
Hard sandstone				++++			++	+
Medium sandstone					++++
Coarse sandstone					++++
Shallow concrete Screed cutting					++++
Asphalt over concrete					++++
Concrete blocks15kn					++++
Breeze blocks					++++
Limestokne/granite Asphalt					++++
Hard asphalt(With flint aggregates)					++++
Green cokncrete					++++
Very abtrasive asphalt					++++
Very abrasive lignacite Blocks					++++

Step 5:Blade Type: A continuous smooth rim provides the smoothest cut in ceramic tiles and ornamental stone. Turbo type blades or segmented turbo type may produce slight chipping but generally have a longer life and lower cost per cut than continuous rim blades. Segmented blades provide the longest life and lowest cost per cut but are only suitable for work where chipping is not a problem.

Segment Type/ Turbo Type /Continuous Rim Type Diamond Blades

	Segment Type	Turbo Type	Continuous Rim Type
Life	++++	+++	++
Cutting	+++	++++	++
Edge&Corner Chipping	+++	++	+
Cost(Meter Per Cut)	+	++	+++

Step 6:The Price: For small jobs, or occasional use, a low-priced tool may be preferable. For larger jobs or regular use, a higher-priced tool will actually be less expensive to use because it will deliver a lower cost per cut. For really big jobs, the lowest possible sawing cost (cost per meter) is usually much more important than the initial price.

	Professional(Lager scale use)	Builder(Contractor)	DIY(trade)	Promotional
Life	++++	+++	++	+
Cutting Speed	++++	++++	+++	++
Initial Buying Price	++++	+++	++	+
Cost(Meter Per Cut)	+	++	+++	++++

Step 7: Wet or Dry Operation (Please refer to the detail requirement in the brochure): wet products must be used with water to keep the segments cool during operation. Water also assists the product to perform at its max. efficiency. Cutting without water on the products will cause excessive heat, resulting in poor performance and blades damage in the form of cracks in the steel center. For concrete floor saws, wet cutting is usually preferred because you can cut deeper when using water as a coolant. For tile and masonry saws, either wet or dry cutting tools can be used.
Dry products must be cooled with airflow around the tool to dissipate the heat. Dry cutting blades are only recommended for intermittent cutting. Every 10-15 seconds the blades should be allowed to rotate out of the cut at maximum rpm for several seconds to allow the blade to cool. Operators should not use dry diamond blades for long continuous full depth sawing in one single pass. Any cuts deeper than 4 cm should be step cutting make several shallow passes until the required depth of cut is reached. On asphalt, operators should avoid cutting into the sub-base of roads as this will cause rapid wear of the segments. Overheating should be avoided particularly when cutting steel reinforced materials such as lintels. Forcing the product into the application is the most common cause of overheating. If signs of overheating are present, such as blue discoloration at the segment and core, then the blade will require redressing. Forced cutting of hard aggregates, or hard low abrasive materials can reduce the cutting ability of the blade. The operator should dress the diamond blade by using it in a soft abrasive material such as sandstone or abrasive blocks which will then restore the cutting properties.
For high-speed cut-off saws, dry tools are more popular, but they are often used wet to control dust. Wet tools and bits MUST be used with water. Dry cutting tools may be used either dry or wet, as the job or equipment allows.

Step 8 : If you are not sure about the blade selection, please contact our sales technical department :0086-511-86985338

5.Some additional information of diamond blades
1).The diamond segment or rim width and height: Diamond tool segment width and height by itself is not a true measure of a tool's value. Other factors also affect the performance of the tool, such as the diamond size, diamond concentration and diamond grade, the hardness of the bond, the cutting power (torque) of the equipment; the segment and slot geometry of the steel core, and how well the blade specification and best of all the correct choice of the blades is matched to the material being cut.
2).The appearance exposure of the segment or rim: do not judge only by the appearance exposure : due to the mixing and sharpening process, sometimes a high grades segment looks less quantity and small diamond size, but in fact it is perfect inside.
Bigger diamond size and high concentration do not mean good quality, you should also consider of the diamond grade, the bond etc.
3).High diamond concentration may not be of high performance, which depend on many other factors such as diamond grade, grit ,bond,blade type ,materials cut, etc. Sometime unsuitable high diamond concentration will cause the segment blunt and can not cut in the material.
4)Blade performance: The most common problem encountered by diamond blade users is blade wear. It is also the most difficult to accurately evaluate .It is impossible to predict the life performance

5)Diamond Blade Cutting Guidelines

	Cutting Speed	Blade Lilfe
Segment Bond Hardness Harder	Slower	Longer
Diamond Quality Higher	Faster	Longer
Diamond grit size bigger	Faster	Shorter
Diamond Concentration Higher	Slower	Longer
Segment width Thicker	Slower	Longer
Segment height Higher	---	Longer
Cutting Depth Deep	Slower	Shorter
Cluktting Pressure Higher	Faster	Shorter
Material Hardness Harder	Slower	Shorter
Material Abrasion More	Faster	Shorter
Aggregate Size Larger	Slower	Shorter
Cutting with coolant	Higher	Longer
Rotation Speed Higher	Higher	Longer
Operator's Experience More	Higher	Longer
Observe the Operating Instructions	You can achieve best and safest performance

6).Knowing About Asphalt
Hot Mix Asphalt is a mixture of Asphalt Cement and Aggregates .
Asphalt does not cure and once spread and rolled, it can be cut or drilled immediately. Sand in asphalt never bonds firmly, and the slurry created when sawing will be extremely abrasive. Need hard bond matrix similar to green concrete blade and undercutting protection segment when undertaking asphalt cutting operations.
Some unique factors should be observed when cutting asphalt:
Hard & large sized aggregates in the asphalt will cause the blade to cut slower.
The greater the aggregate-Sand ratio, the faster the blade will cut, but total footage may decrease.
It is common to cut through the asphalt layer into the sub-base. Generally, the sub-base contains a high content of very abrasive materials such as sand, dirt, dusts and like materials. This undesirable situation causes rapid wear of the diamond blade.
Chunks or broken-up asphalt to be cut often attract dirt and sand fillers within the cracks. This will make the asphalt more abrasive and affect the life of the diamond blade.

7).Knowing About Concrete
A.Compressive Strength
Concrete Hardness
Very hard -Nuclear Plants; Hard -Bridges, Piers; Medium -Roads;
Soft -Sidewalks, Patios, Parking lots ;B.Length of curing time,
State 1.
Green Concrete- 0 to 8 hours after the pour but not hardened completely. Typically, sawing control joints of highways, industrial flooring, driveways, runways and similar projects is performed during this state. In this state the sand in the mixture has not bonded to the mortar blend firmly and will cause extreme abrasive action once cutting begins so it is necessary to use hard bond and under-protection segment for the steel core of the diamond blade.

State 2
Semi-cured concrete- 8 to 24 hours after the pour. Generally, control joints established in State 1 are widened during this time.A slightly softer bond is required.
State 3
Cured concrete- 24 to 72 hours after the pour. The sand is held firmly in the mortar mixture.In this state it is important to consider of the aggregates, hardness and steel content of the concrete factors in determining proper diamond-blade selection.
C. Aggregates
In the concrete 60 to 75% are aggregates. They influence the way both green and cured concrete perform. Aggregates can be naturally occurring minerals, sand and gravel, crushed stone or manufactured sand. The average size and composition of aggregates greatly influence the cutting characteristics and selection of the diamond blade. Large aggregates cause blades to cut slower; smaller aggregates allow the blades to cut faster.
Hard aggregates shorten blade life and reduce cutting speed.
D.Sand composition :
o River Sand (round nonabrasive)
o River Bank Sand (sharp abrasive)
o Manufactured Sand (sharp abrasive)
River Bank Sand and Manufactured Sand are more abrasive than River Sand. The more abrasive the sand is, the harder the bond-matrix requirements. Sharper, more geometrically defined sands also require harder bonds.
5. Steel Reinforcement
Reinforcing steel bars (rebar) are steel wire strand of wire meshing into the concrete. It costs more to cut concrete that contains reinforcing steel because cutting rates are slower and blade life is reduced. If the cross-sectional area of concrete is 1% steel, the blade life will be about 25% shorter than if no steel were present.