A  What is a diamond saw blade

A diamond blade is composed of the circular steel base and the diamond segments. The segments are separated

by slots of the steel base. These slots assist in cooling the blade during sawing by allowing water (wet cutting) or air (dry cutting) to flow among the segments.

The segments or rims are a mixture of diamond powder and metal powder. The diamond powder is man-made and has many brands as well as grades. Usually, we first mix diamond powder and metal powder by some way and then sinter the mixture . During the process the metal power and diamond powder are compressed at very high temperature and pressure to obtain the segments, which contains the diamond grain.

B  How to make a diamond saw blade

a  Laser welded: laser enables the segment to be welded on the steel base.

b Silver brazed: segments are silver brazed on the steel base at high temperature.

c Sintered: it is divided into two

  Cold press Sintered  firstly, we press the mixture of diamond powder and metal powder with press machine under normal circumstances, then work the mixture with sinter machine under high pressure and temperature in order to get the solid bond.

  Hot press sintered    we press the mixture of diamond powder and metal powder with hot press machine under high pressure and temperature in order to get the solid bond

C How does a diamond saw 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 materials. The surface diamonds thus exposed mill a groove in the material.

During cutting, the exposed diamond grain may crack or break. The workpiece simultaneously starts to wear the metal matrix, which gradually releases more diamond grain.

Blades for cutting hard, dense less abrasive materials (such as tile, hard  bricks, stone or reinforced concrete), we need a softer metal matrix. This will wear down faster, replacing the worn diamonds fairly so that the blade continues to cut.

Blades for cutting soft, abrasive materials (such as green concrete and asphalt), we need  a hard, abrasion-resistant metal matrix in order to retain the diamonds for a long time.

D How to select a diamond tool

When choosing a diamond tool, you should follow

Step 1 :How to use  Cutting, Drilling or Grinding

Be sure that cutting saw blade is deadly dangerous to use for grinding or making a hole. You should not take the risk just to save meaningless small money by using one blade to finish all work.

step2: What kind of machine the blade will be used

Step 3: Btade Usage

How often you will use it

How fast a cutting speed you require

 Professional Purpose  for large civil engineering construction on a regular daily basis, requiring long life (less expensive

    per cut/meter)and fast cutting speed

Builder's (contractor) Purpose   for regular use with medium life and fast cutting speed no need the same life of a pmfesSiona

 DIY Purpose   for small scale occasional use, requiring fast cutting speed and reasonable life.

Promotional Purpose cutting well with water but with short life

Step 4: Blade type

A continuous rim blade 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 blade. Segmented blades provide the longest life and lowest cost per cut but are only suitable for work where chipping is not a problem.

Step 5: Blade purpose-----Consider what material 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, you have no way except buying two different blades. You can not expect the blade to work correctly and safely on both materials. The blade will either become blunt and overheat of will wear very quickly.

Step 6:  Price

For small jobs, or occasional use, a low-priced tool may be preferable. For bigger 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 initial price.-

Step 7: Wet or Dry Operation  (Please refer to the detail requirement in the brochure)

 wet cutting blades 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 workpiece will cause excessive heat, resulting in poor performance and blade damage in the form of cracks in the steel base. For concrete floor saws, wet cutting is usually prefered 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 10-15seconds 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 4cm should be stepped to make several shallow passes until the required depth of cut is reached. As for  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 material such as lintels, Forcing the product into the application is the most common cause of overheating. lf signs of overheating are presented, such as blue discoloration at the segment and steel base, then the blade will require  redressing. Forced cutting of hard aggregates, 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 propenies.

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 us by phone or by e-mail.

E   some addition 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 base, 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 diamond :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 9mde,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. Sometimes 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, though we can predict the life of the blade.

5)  Diamond Blade Cutting guidelines

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 similar 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. 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 base of the diamond blade.

State 2.

semi-cured concrete  8 to 24 hours after the pour-Generally, control pints established in State 1are 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. ln 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

bf 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 egates shorten blade life and reduce cutting speed-

D  Sand composition:

River Sand (round nonabrasive)

River Bank Sand (sharp abrasive)

Manufactured Sand (sharp abrasive)

River Bank Sand and Manufactureed 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.

E  Steel Reinforcement

Reinforcing steel bars (rebar) are steel Wire strand of wire meshing into the concrete. It costs more cut concrete that contains reinforcing steel because cutting rates are slower and blade life is reduced. lf the cross-sectional area of concrete is1%steel,the blade life will be about 25% shorter than if no steel were present.