To choose appropriate pitch can extend life of saw blade and enhance efficiency. Basic data are as following.
Basic data are as following.
① As thickness is thicker, pitch will be larger. On the contrary, it is thinner, pitch will be smaller.
② As material contains much viscosity, pitch will be larger. On the contrary, it contains less viscosity, pitch will be smaller.
③ If you want to get fine surface, pitch has to be small.
④ If you want to cut in hurry, pitch has to be large.
In other words, pitch is changed depending on thickness, kind of material. As pitch is larger, the number of teeth will be less and cutting speed will be slower. However, even though material is strong, it is impossible to prescribe the pitch size. Because, as material is stronger, you can preadjust cutting speed then you can get same effect to adjust pitch.
If pitch is too large, surface will be rough and saw blade will be made load. So it will be easy to wear or to be broken. On the other hand, pitch is too small, chips of work piece can`t be pushed out, it will be wore or broken.
Generally, pitch is chosen by DIN dimension 1837-8, from our express, the way of choosing pitch is as follows :
When you cut the high tensile iron and steel, alloy steel and stainless steel, you had better use pitch which is lower one step than structural steel.
When work piece is nonferrous tube or profile, basically copper is around 5p and aluminum is around 8p. In solid bar case, depending on size and hardness of surface, it has to be increased and decreased.
Maximum using portion of out diameter is blade edge except flange, and it has to contain surplus for safety. However it is necessary that user have to make a appropriate decision, as it will be reground for economical using.
Following chart is for flange and processing face regarding to out diameter.
For instance, if you cut Ø100 material by 90°, then standard choosing of out diameter will be as following.
- Min. cutting dimension : 100 x 2 = 200mm
- Min. re-grinding surplus dimension : First 0.5mm x 2 x 20times = 20mm
- Depending on feature of machine (regarding to thickness of table as moving up, down and parallel) : 20mm (When water is needed, ignore it)
- Flange size of saw blade : Flange size which amount is 240mm up to now = 240 x 1/2 = 120
- As a result, Ø360 saw blade will be selected.( 240mm+ 120mm = 360mm)
Feeding pressure means the pressure that saw blade enter into the material. When you work, you notice following.
① Cutting speed has to be regular speed.
② As feeding pressure is bigger, cutting time will be shorter and tool life will be shorter.
Appropriate choosing of teeth form is related to material and profile of work piece and, it affects tool life and safety.
There are 5 kind of teeth forms as following.
Regarding DIN 1840:
① A : This is usually used for cutting mild steel which is easy to be broken and cut.
This is accepted 2mm～4mm pitch or more.
② AW : This is almost same as A, except for chamfering in turns.
Nowadays, this is hardly used, then A or BW are used instead of this.
③ B : Because it is changed straight part of A into curve, pocket of chip is bigger.
So its pocket is bigger than A and it is able to cut thick material.
④ BW : This is almost same as B, except for chamfering in turns.
This load is less than B, and it is suitable to cut thick material.
This is applied to cut nonferrous pipe, profile and heavy metal solid bar.
Usually, A or B is used for CUTTER, and BW or C is used for SAW.
⑤ C : C goes by the name of HIGH-LOW form.
There are two kind of different height teeth, and difference of between two teeth is 0.15～0.3mm.
It is cut both side on the high tooth face, and at the same time, it is also removed chip.
This is possible to be processed when the thickness of saw blade is proper to be ground.
This is used for cutting round solid bar, rectangle solid bar, heavy metal and thick pipe.
⑥ The others : Chip Brake
According to DIN standards, it said that 'For cutting angle, A and AW form is N = 5°, H = 10°, and B, BW and C form is N = 15°, H = 3°, W = 25° and their tolerance is ±2 °in DIN 1840.'
In other words, hardened material require small cutting angle and soft material require big cutting angle. This is proof that chip and angle(chip pocket) is unified.
Usually, in case of cutting solid bar and steel pipe, general machine tool uses watersoluble coolant and in case of cutting aluminum, diesel or mixture of petroleum and lubricant is used. For cutting copper, sometimes using coolant is restrained.
And sometimes cooling lubrication is used, and especially, coolant which is made for enduring high pressure can keep the membrane of lubricant and protect cutting tool.
If you use high quality coolant, user can use it for a long time and get fine cutting surface. Furthermore because it can push out chip smoothly, so generally user can save the cost. For cutting nonferrous used lubricant sometimes, if user use watersoluble coolant, then it will be reduce rough cutting face and tool life and some case will make ear-splitting noise. So it is very important to choose proper cutting coolant.
Moreover, cooling lubricant is special solid products and it is used on both side of rotational saw blade by rubbing. Then user can get cooing and lubricant.
Tip Saw is the saw blade which is welded carbide tips on the carbon steel shank(SK-5 or SKS-5) by silver solder. As compared with friction saw blade or HSS saw blade, a hardness of carbide tips is pretty much higher(SK-5: HRC 41-45, SKH: HRC 63-65, carbide tips: HRC 72-75), and a tool life of this saw blade is longer 4～5times than others, because its diminution of hardness is less at high temperature.
Especially, the feature of our Tip Saw is :
- Depending on cutting material, we choose proper carbide tips for the best efficiency.
(the sort of carbide tips: K-10, P-20, A-30 etc.)
- It is superior to be welded under the low temperature and ground in full automatical welding machine
under uniform welding condition with silver solder.
So it can give full scope as original carbide tip.
- Because it is ground in full automatical grinding machine, so it can be chosen various teeth form as cutting material.
After accurate production and inspection under the KS(Korean industrial Standard), it can be delivered.
P20, A30 : Usually, this is using for cutting hard metal, because it is superior to resistance about heat and weight etc.
K10, K20 : Even though this is week for heat, it is superior to wear resistance, so it is used for cutting nonferrous metal or wood.
You should refer to catalogue and choose teeth form and uses of Tip Saw Blade regarding to cutting condition, tool life, chip shape and working noise.
Because number of teeth affects to cutting face and tool life, so you should choose number of teeth through cautious examination. Generally, proper thickness of chip is below 0.05mm.
First of all, figure out thickness of tip.
A formula(table) cutting speed of saw blade
(Table) Cutting speed of saw blade
|Steel||Cast iron||Non ferrous metal|
and profiles steel
|80 - 150||180 - 360||3600 - 6600|
and profiles steel, Bar
|50 - 100||100 - 180||2400 - 4500|