Aluminum Saw Blade Tooth Profile Angle Selection and Tooth M

To obtain smooth cutting surface without burrs, no edge chipping, no aluminum sticking and no blade burning in aluminum processing, the core keys are reasonable tooth profile selection, front and rear angle configuration and tooth density matching. Many aluminum processing factories suffer poor cutting effect mostly due to wrong tooth profile, unreasonable cutting angle and mismatched tooth quantity. Mastering professional matching rules can directly improve cutting quality and saw blade service life.

1. Four mainstream tooth profiles for aluminum saw blades and applicable uses

1.1 Left-right alternate tooth

The cutting edges are arranged alternately left and right, with large chip removal groove, smooth chip discharge, low cutting resistance, good heat dissipation and less aluminum sticking. It is the most universal tooth type for aluminum cutting. It is suitable for ordinary aluminum profiles, aluminum square tubes, round tubes, conventional broken bridge aluminum materials, aluminum strips and general solid aluminum materials. It is not recommended for high-gloss precision cutting and ultra-thin aluminum sheets, which are easy to cause slight edge chipping.

1.2 Trapezoidal flat tooth

Adopt high-low staggered tooth structure. The higher tooth cuts the groove first, and the flat tooth trims the cutting surface later. The incision is mirror smooth without burrs and edge chipping, which is the first choice for precision aluminum cutting. It is suitable for system broken bridge doors and windows, high-end curtain wall aluminum materials, high-gloss decorative aluminum profiles and 45-degree angle precision cutting. The cutting surface can be directly assembled without secondary polishing.

1.3 Flat straight tooth

Flat tooth top with stable cutting edge, small vibration and no tearing on the plate surface. It is mainly used for thin aluminum sheets, aluminum-plastic plates, honeycomb aluminum plates and grooving cutting of composite aluminum plates. It is not suitable for thick solid aluminum bars and large-section profiles, which are easy to cause machine holding and poor chip removal.

1.4 Arc bottom tooth

Large arc tooth root design with sufficient chip removal space and excellent heat dissipation performance. It is not easy to accumulate aluminum scraps, overheat or burn the blade during cutting. It is specially suitable for large solid aluminum bars, thick aluminum strips, large-section industrial aluminum profiles and deep cutting blanking.

2. Key angle selection standard for aluminum saw blades

2.1 Front cutting angle

The recommended front angle for aluminum cutting is 10° to 15°. Larger front angle makes cutting sharper and feeding labor-saving without machine holding; excessive front angle will make the cutting edge thin and easy to chip. Smaller front angle leads to dull cutting, laborious pushing and easy aluminum sticking and heating. For thin materials and hollow aluminum materials, choose 15° front angle for sharper cutting; for thick solid aluminum bars and large-section materials, choose 10° front angle for stable cutting and anti-chipping.

2.2 Rear clearance angle

The standard rear angle is 12° to 18°. A proper rear angle reduces friction between saw blade back and aluminum material, avoiding overheating, blade burning and edge pasting. Too small rear angle causes severe friction and sharp temperature rise; too large rear angle weakens the tooth edge strength and easily causes tooth chipping and falling off.

2.3 Inclination angle

Aluminum saw blades usually adopt negative inclination or slightly flat inclination angle to prevent the cutting edge from biting material and edge chipping. Precision trapezoidal flat tooth saw blades mostly adopt slight negative angle to ensure flat and smooth cutting surface.

3. Core skills of tooth density matching

The matching principle can be summarized as: thick material with fewer coarse teeth, thin material with more fine teeth; solid material with fewer teeth, hollow material with dense teeth; rough cutting with fewer teeth, precision cutting with more teeth.

3.1 Coarse tooth with small quantity

With large tooth pitch and wide chip removal groove, it has good heat dissipation, no aluminum scrap blocking and small cutting resistance. Conventional tooth quantity is 40 to 80 teeth, suitable for aluminum bars, thick aluminum plates, large-section solid aluminum and heavy industrial profile rough blanking.

3.2 Medium conventional tooth

Balancing chip removal and cutting finish with strong universality. Conventional tooth quantity is 100 to 120 teeth, suitable for ordinary broken bridge aluminum, aluminum square tubes, round tubes and conventional profile cutting.

3.3 Fine dense tooth

The cutting texture is delicate with no burrs and high angle precision. Conventional tooth quantity is 160 to 200 teeth, suitable for 45-degree precise angle cutting, precision broken bridge windows, thin-walled aluminum tubes and high-gloss decorative aluminum precision cutting.

4. Precise matching of tooth profile and tooth quantity for different aluminum materials

Broken bridge aluminum profile: trapezoidal flat tooth is preferred, with 120 to 160 teeth and front angle 12° to 15°.

Industrial aluminum square tube and round tube: left-right alternate tooth, matched with 100 to 120 teeth.

Solid aluminum bar and thick large aluminum profile: arc bottom tooth or coarse alternate tooth, matched with 40 to 80 teeth.

Thin aluminum sheet and aluminum-plastic plate: flat tooth, matched with 160 to 200 fine teeth.

45-degree precise angle cutting: trapezoidal flat tooth, matched with 160 to 180 teeth.

5. Common wrong matching avoidance

Using dense fine teeth for thick aluminum bars will cause chip blocking, heating, aluminum sticking and tooth chipping. Using ordinary coarse alternate teeth for precision broken bridge aluminum will lead to edge chipping and burrs, unable to assemble directly. Excessively large front angle is sharp but easy to chip and short service life; too small front angle makes cutting dull and increases machine load. Using coarse teeth for thin plates will cause plate tearing and edge gap defects.

6. Summary

When selecting aluminum saw blades, confirm tooth profile first, then configure front and rear angles, and finally match tooth density. Choose trapezoidal flat tooth with medium and fine teeth for high-precision cutting, left-right alternate tooth with medium teeth for ordinary profiles, arc coarse tooth with fewer teeth for thick solid aluminum, and flat fine tooth for thin plates. Follow the standard angle of front angle 10°-15° and rear angle 12°-18°, which can realize no edge chipping, no burrs, no aluminum sticking and significantly improve durability.