The drill material types determines the life of the drill.A drill bit is a tool that rotates and has cutting capabilities at the head end. It is generally made of carbon steel SK or high-speed steel SKH2, SKH3 and other materials, milled or rolled and then quenched and heat-treated. It is used for metal or other materials. Drilling on top. It has a wide range of applications and can be used on machine tools such as drilling machines, lathes, milling machines, and electric drills. Drill bits can be divided into the following types according to different types:

a. Classification by structure

  1. Integral drill bit: the drill top, drill body and drill shank are made of the same material as a whole.
  2. End-welded drill bit: The top part of the drill bit is welded by carbide.

b.Classification according to drill

  1. Straight shank drill bit: Straight shank is used for drills with a diameter below φ 13.0mm.
  2. Taper shank drill bit: The drill bit shank is tapered, and generally its taper adopts Morse taper.

c.Classification by use

  1. Center drill bit: generally used for drilling the center point before drilling, the front taper surface has 60°, 75°, 90°, etc.
  2. Twist drill bit: the most widely used drill bit in industrial manufacturing.
  3. Superhard drill bit: The front end of the drill body or all of it is made of superhard alloy tool material, which is used for drilling of processing materials.
  4. Oil hole drill: There are two small holes in the drill body. The cutting agent reaches the cutting edge through the small holes to take away heat and chips. When using this drill, the work object rotates and the drill is stationary.
  5. Deep hole drill bit: It was first used for drilling of gun barrels and stone guarantee pipes, also known as gun barrel drill bits. The deep hole drill bit is a straight flute type, and a quarter-strong part is cut off in the round tube to produce cutting edge chip removal.
  6. Drill bit reamer: the front end is a drill bit, and the rear end is a reamer. The diameter of the drill bit and the diameter of the reamer are only different from the allowance for reaming. There are also drill bits used in combination with screw tapping, so they are also called hybrid drill bits.
  7. Taper drill bit: Taper drill bit can be used when processing the mold inlet.
  8. Cylindrical hole drill: We call it a countersunk milling cutter, and the part with a smaller diameter at the front end of this drill is called a rod.
  9. Conical hole drill bit: for drilling conical holes, the front end angles are 90°, 60°, etc. The chamfering cutter we use is one of the conical hole drills.
  10. Triangular drill bit: A drill bit used by an electric drill. The drill shank is made into a triangular surface so that the chuck can securely fix the drill bit.
Drill bit material type selection:

Drill bit material types selection criteria

Drilling operation is essentially a kind of cutting processing.And the prerequisite for completing cutting processing is that the hardness of the tool material must be higher than that of the material being processed.

Drill bit material type selection:

Drill material types:

The material of the drill bit is generally divided into HSS, HSS containing cobalt, powder HSS, and tungsten steel drill bit. The hardness of the above drill bit materials increases step by step. And the hardness of the workpiece is converted into HV Webster hardness. If the hardness of the drill bit is more than 3 times that of the workpiece, it is enough. Of course, the surface hardness of the drill bit is greater than the surface hardness of the workpiece. The higher the better, the longer the life of the drill bit.

Drill bit material type selection

To drill holes on wooden materials, use woodworking drills together. Woodworking drills have a large sales volume and do not require high tool hardness. The tool material is generally ordinary high-speed steel (HSS).

Drill bit material type selection:

Drill holes on general metal materials (alloy steel, non-alloy steel, cast iron, cast steel, non-ferrous metals), and use metalworking drill bits. The drill bit material is generally high-speed steel (advanced tools contain cobalt HSS-Co).

To drill holes in concrete materials and stone materials, use a percussion drill with a masonry drill bit, and the material of the cutter head is generally cemented carbide.

Tungsten-carbon alloy is used to drill holes on ceramic tiles and glass with higher hardness. Due to the high hardness and poor toughness of the cutter, it is necessary to pay attention to low speed and no impact.

A drill is a tool used to drill through holes or blind holes in solid materials and to ream existing holes. Commonly used drills mainly include twist drills, flat drills, center drills, deep hole drills and casing drills. Although reaming drills and countersinking drills cannot drill holes in solid materials, they are also customarily classified as drill bits.

High-speed steel hollow drill bit, also known as core drill bit or hole opener, drill bit classification: high-speed steel drill bit, carbide drill bit, tungsten steel drill bit; cutting depth: 35MM, 50MM, 100M; suitable drilling machine: imported magnetic base drill, Magnetic drills, domestic magnetic base drills, magnet drills, iron-absorbing drills, steel plate drills, magnetic drills, machine tools, bench drills, seat drills, etc. Diameter specifications: 12MM to 100MM; the main materials of drill bits are high-speed steel; powder metallurgy; hard alloy.

The axis of the drill bit should be inclined at an angle of 60° with the surface of the grinding wheel. This angle is the front angle of the drill bit. If the angle is wrong at this time, it will directly affect the size of the top angle of the drill bit, the shape of the main cutting edge and the bevel angle of the chisel edge. This refers to the positional relationship between the axis of the drill bit and the surface of the grinding wheel, which is 60°, which is generally more accurate. Here, attention should be paid to the relative horizontal position and angular position before the drill is sharpened. The two should be considered as a whole. Don’t ignore the angle of setting for the sake of leveling the cutting edge, or ignore the leveling of the cutting edge for the purpose of setting the angle.

The greater the length-to-diameter ratio of a bit, the greater its tendency to bend. Reducing the aspect ratio can reduce the deflection force, thereby avoiding the breakage of the drill bit and the increase of the hole diameter error. Deeper holes require drill sizes with larger length-to-diameter ratios. Usually the hole depth exceeds 3 times the diameter is a “deep hole”, and the hole depth of micro-drilling generally exceeds this limit.

Hammer drill specifications: 6mm, 8mmx110mm; 8mmx160mm; 8mm, 10mm, 12mmx210mm, 10mm, 12mm, 16mm, 20mmx450mm.

The main body of the hard alloy electric hammer drill is made of high-quality alloy steel, and the cutter head is welded with hard alloy. Used together with various electric hammer machines, it is suitable for drilling holes in hard building materials such as concrete and bricks. It is a drilling tool with wide application and high efficiency in construction and installation industries.

The specifications of the electric hammer drill set are: 5*110mm, 6

The specifications of the electric hammer drill set are: 5110mm, 6110mm, 6160mm, 8160mm, 10*160mm

Electric Hammer Drill Round Shank Square Shank

6MM 8MM 10MM 12MM 14MM 16MM-28MM for

The length of the wall drill is 350MM

6MM 18MM 20MM 22MM 25MM 28MM

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