carbide drillRequirements for front and rear corner edge shape and edge passivation treatment
The angle of tungsten steel drill bits is generally 118 degrees or 135 degrees, of which 118 degrees is suitable for drilling through general materials, and 135 degrees is suitable for drilling through materials with higher hardness.
There are usually two types of blade designs, namely smooth blade and spiral blade. Smooth edged drill bits are highly efficient and suitable for use indrillingIn smaller cases, the narrow width and large taper inhibit the heating of the edge; while the spiral edge drill has a greater thrust and is suitable for larger diameters and drilling depths. In addition, the width of the edge band will also affect the efficiency and life of the drill bit. Generally, the larger the width, the higher the efficiency, but the life may be affected.
Design requirements for tungsten steel drill blade?
Reasonable cutting angle
The cutting angle of the chisel edge should be appropriately determined based on factors such as the working environment of the drill bit and the hardness of the material. Generally speaking, the smaller the cutting angle, the less likely the drill bit is to wear, but it will also increase the cutting force.
The drill bit with a diameter of 4mm adopts a straight groove shape, characterized by a straight edge and a negative rake angle; even if the diameter is small, it can ensure the rigidity of the tool, while ensuring the strength of the edge and low cutting resistance; the drill bit with a diameter greater than or equal to 4mm adopts a corrugated blade shape and has a wider cutting groove for better chip removal.
Grinding and edge passivation treatment of cemented carbide drill bits
carbide drillSome burrs will occur on the main cutting edge after drilling. If it is not cleaned in time, it will easily cause chip accumulation. If the edge of the cutting edge is worn, the gap will intensify the wear during the cutting process and severely shorten the wear time. After the main cutting edge is passivated, the cutting edge forms an R-shaped arc, which is not easy to break when drilling, improving the surface finish of the hole.
Requirements for front and rear corner edge shape and edge passivation treatment of cemented carbide drill bits: The cutting edge passivation treatment forms a small arc R on the cutting edge of the cemented carbide drill bit to disperse the cutting resistance and treat the fine teeth on the cutting edge and ligament, thereby improving the rigidity of the cutting edge. Prevent it from being too sharp and easily cracked or worn out. Passivation treatment methods include nylon brush passivation, passivation machine strengthening method and suspension passivation method. Polishing agent passivation is commonly used. Passivation machine strengthening method: Load 18 cemented carbide drill bits on the passivation machine at a time, add diamond sand to the barrel below them, then insert the cemented carbide drill bit into the diamond sand, rotate and rotate for a few minutes, then, the cutting edge of the drill bit can be uniformly passivated. The amount of passivation is closely related to time. Strict control of passivation time can ensure the amount of passivation, thereby controlling and improving the service life of the drill bit. Generally, passivation takes 30 minutes forward and 5 minutes backward.
In order to avoid the main cutting edge of the cemented carbide drill bit being too sharp and causing chipping, the main cutting edge will be negatively chamfered. For processing of different materials, the main cutting edge and auxiliary chamfer are slightly different. The chamfer value is 0.06-0.08mm, cast iron 0.08-0.10mm, stainless steel 0.02-0.03mm, and aluminum alloy 0.01-0.015mm. The negative chamfer passivation amount is measured directly on a dual-lens five-axis measuring instrument.
in order to improvecarbide drillWear resistance, coating or internally cooled alloy drill bits can be used,internally cooled drill bitThe cooling effect is better during drilling. The heat generated by the drill bit during working can be cooled by the coolant. At the same time, the drill chips can be discharged well and the service life of the cemented carbide drill bit is improved; if the drill bit cannot be dissipated well, it will cause the drill bit to deform or break. Therefore, it is required to dissipate heat in time during the cutting process to ensure the stability and service life of the drill bit.
carbide drillRequirements for front and rear corner edge shape and edge passivation treatment
The angle of tungsten steel drill bits is generally 118 degrees or 135 degrees, of which 118 degrees is suitable for drilling through general materials, and 135 degrees is suitable for drilling through materials with higher hardness.
There are usually two types of blade designs, namely smooth blade and spiral blade. Smooth edged drill bits are highly efficient and suitable for use indrillingIn smaller cases, the narrow width and large taper inhibit the heating of the edge; while the spiral edge drill has a greater thrust and is suitable for larger diameters and drilling depths. In addition, the width of the edge band will also affect the efficiency and life of the drill bit. Generally, the larger the width, the higher the efficiency, but the life may be affected.
Design requirements for tungsten steel drill blade?
Reasonable cutting angle
The cutting angle of the chisel edge should be appropriately determined based on factors such as the working environment of the drill bit and the hardness of the material. Generally speaking, the smaller the cutting angle, the less likely the drill bit is to wear, but it will also increase the cutting force.
The drill bit with a diameter of 4mm adopts a straight groove shape, characterized by a straight edge and a negative rake angle; even if the diameter is small, it can ensure the rigidity of the tool, while ensuring the strength of the edge and low cutting resistance; the drill bit with a diameter greater than or equal to 4mm adopts a corrugated blade shape and has a wider cutting groove for better chip removal.
Grinding and edge passivation treatment of cemented carbide drill bits
carbide drillSome burrs will occur on the main cutting edge after drilling. If it is not cleaned in time, it will easily cause chip accumulation. If the edge of the cutting edge is worn, the gap will intensify the wear during the cutting process and severely shorten the wear time. After the main cutting edge is passivated, the cutting edge forms an R-shaped arc, which is not easy to break when drilling, improving the surface finish of the hole.
Requirements for front and rear corner edge shape and edge passivation treatment of cemented carbide drill bits: The cutting edge passivation treatment forms a small arc R on the cutting edge of the cemented carbide drill bit to disperse the cutting resistance and treat the fine teeth on the cutting edge and ligament, thereby improving the rigidity of the cutting edge. Prevent it from being too sharp and easily cracked or worn out. Passivation treatment methods include nylon brush passivation, passivation machine strengthening method and suspension passivation method. Polishing agent passivation is commonly used. Passivation machine strengthening method: Load 18 cemented carbide drill bits on the passivation machine at a time, add diamond sand to the barrel below them, then insert the cemented carbide drill bit into the diamond sand, rotate and rotate for a few minutes, then, the cutting edge of the drill bit can be uniformly passivated. The amount of passivation is closely related to time. Strict control of passivation time can ensure the amount of passivation, thereby controlling and improving the service life of the drill bit. Generally, passivation takes 30 minutes forward and 5 minutes backward.
In order to avoid the main cutting edge of the cemented carbide drill bit being too sharp and causing chipping, the main cutting edge will be negatively chamfered. For processing of different materials, the main cutting edge and auxiliary chamfer are slightly different. The chamfer value is 0.06-0.08mm, cast iron 0.08-0.10mm, stainless steel 0.02-0.03mm, and aluminum alloy 0.01-0.015mm. The negative chamfer passivation amount is measured directly on a dual-lens five-axis measuring instrument.
in order to improvecarbide drillWear resistance, coating or internally cooled alloy drill bits can be used,internally cooled drill bitThe cooling effect is better during drilling. The heat generated by the drill bit during working can be cooled by the coolant. At the same time, the drill chips can be discharged well and the service life of the cemented carbide drill bit is improved; if the drill bit cannot be dissipated well, it will cause the drill bit to deform or break. Therefore, it is required to dissipate heat in time during the cutting process to ensure the stability and service life of the drill bit.
