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A carbide drill is a drilling tool made from carbide alloy and can be used for cutting operations on a wide range of materials, from carbon steel to heat-resistant alloys. Carbide alloy is characterized by its high hardness and the fact that its hardness decreases only slightly even at high temperatures. It is a material made by mixing tungsten carbide and cobalt, which acts as a binder, and adding titanium carbide among others to suit specific purposes. This article explains the advantages and disadvantages of carbide drills, as well as points to consider when selecting them.
In metalworking, the representative types of drill materials include carbide drills and high-speed steel (HSS) drills. Selection needs to be based on the requirements to be met, such as machining time and cost. The advantages and disadvantages of choosing carbide drills include the following:
The advantages of carbide drills include excellent wear resistance and suitability for high-speed cutting.
As for the material of the drill, there are high-speed steel (HSS) drills made from steel alloyed with elements such as tungsten, chromium, and cobalt. However, carbide exhibits superior wear resistance compared to HSS. When used as a drill, a significant advantage of carbide drills over HSS drills is their longer tool life.
Carbide has the characteristic of being less prone to hardness reduction at high temperatures, which means that even during cutting operations where the tool can become very hot due to high speeds, its performance is less likely to degrade. HSS can experience a reduction in hardness due to the high temperatures generated by high-speed cutting, making carbide drills more suitable for high-speed cutting applications.
In contrast to the advantages of carbide drills mentioned so far, the lack of toughness and the significantly higher cost compared to HSS are disadvantages of carbide drills.
A weakness of carbide drills is their low toughness. Low toughness means that the tool is more likely to break under bending or vibration, requiring proper management of chips which can cause these issues. On the other hand, the low toughness also means that the drill is less likely to bend during machining, allowing for high precision in the drilling process.
Carbide drills are more expensive, which is a disadvantage compared to HSS. However, due to their superior wear resistance compared to HSS, using carbide drills could potentially result in lower running costs under certain machining conditions.
The typical drills made from carbide material include solid drills and indexable insert drills.
A solid drill has an integrated structure from the shank to the cutting edge, featuring a wide range of small diameters and capable of achieving high machining accuracy. As the cutting tool wears out and its performance decreases over time, it can be re-sharpened to restore its sharpness, which is a significant advantage in terms of long-term running costs.
An indexable insert drill has a body and cutting edge that are separate, allowing the cutting edge part of the drill to be replaced. This means that when the cutting edge wears out, only the edge needs to be replaced, not the entire drill, which has advantages such as making it less likely to make mistakes in protrusion length. Since only the cutting edge is replaced, especially types that combine multiple tips are used for larger hole diameters, offering superior lineup and cost-effectiveness.
There are various types of carbide drills, and selecting one requires considering factors such as hole diameter, depth of machining, machining accuracy, and workpiece material.
When selecting carbide drills based on diameter and depth, the following points are important:
When performing drill machining, the dimension of the hole becomes slightly larger than the tool diameter due to mounting accuracy, bite, and vibrations that occur during machining. This is one point that needs attention when selecting a tool to achieve the targeted hole diameter.
For holes where the depth is more than ten times the diameter (L/D10), long drills are used. Long drills become more unstable the longer they are, increasing the risk of the drill breaking or the hole becoming misaligned during machining. Therefore, drills for guide hole machining are selected to improve the accuracy of hole positions.
When high precision is required, such as for fitting tolerances, finishing processes such as reaming or boring may be conducted after drilling. The diameter drilled needs to be slightly smaller than the target diameter to accommodate finishing, so care must be taken when selecting the drill diameter.
When selecting a carbide drill, it's necessary to consider the relationship with the workpiece material and whether coolant holes are required.
The material of the carbide drill needs to be chosen based on the workpiece material being machined. Tool manufacturers set recommendations based on the material to be cut, such as P-grade for carbon steel and N-grade for aluminum alloys, so selecting the tool material accordingly is effective.
When machining materials like low carbon steel or aluminum alloys, chip breaking and evacuation can become issues. In such cases, choosing tools with coolant holes allows for machining while ejecting coolant, minimizing the impact of chips.
When machining with carbide drills, it's necessary to set the machining conditions considering tool length and chip evacuation.
The protrusion amount of the drill tool changes significantly depending on the depth of the hole being machined. As the protrusion amount increases, the impact of tool deflection also increases, necessitating the setting of machining conditions such as cutting speed and feed rate according to the tool length.
It's important to set machining conditions that allow for smooth evacuation of chips generated during cutting, as chips winding around the tool holder or elsewhere can have adverse effects, regardless of whether the chips are segmented.
The recommended cutting speeds and feed rates for carbide drills vary by the material being cut, as follows:
Work Material Cutting SpeedFeed per Revolution
Carbon Steel (S50C) 120m/min 0.2mm/rev Stainless Steel (SUS430)80m/min
0.15mm/rev
Titanium Alloy (Ti-6Al-4V)40m/min
0.15mm/rev
Aluminum Alloy (A)200m/min
0.10mm/rev
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When inputting cutting conditions such as "spindle speed" and "feed rate" into the NC program, please refer to the tables in the following catalogs for guidance:
These resources can provide detailed recommendations for cutting speeds and feed rates based on the material being machined.
The drilling machine, the drill press, is a cutting procedure that creates circular holes in solid materials such as metal, plastic, wood, rocks, etc., using drill bits of various diameters.
Today, we'll delve deeply into drilling machines, their uses, upkeep, benefits, and drawbacks, among other things.
Small hand-held power drills and bench-mounted and floor-mounted models are all distinct sizes and types of drilling machines. They are used to tapping large, tiny holes and countersinking, counterboring, reaming, and spot facing. The principles and drill bits used to accomplish the activities vary greatly since drilling machines can perform them.
To accomplish different hole sizes on the abovementioned tasks, drilling machines are utilized with drill bits with sharp cutting edges. To get a decent hole, the operator must understand how to set up the job, modify speed and feed, and change coolant.
Lubricating the interface between the drill bit and the workpiece as it is being used is one of the essential maintenance procedures for a drilling machine. By doing so, the heat and friction produced by the moving parts are reduced. Some manufacturers include instructions for the appropriate cleaning and lubrication techniques.
To prevent damage to the moving parts, the drilling machine is expected to be cleaned up after each usage and cleared of chips. Ensure the spindles and sleeves are grit-free to prevent harming the precision fit. Oil should be sparingly coated on the surfaces of the machine parts, especially the bed, to avoid rust.
Larger holes need to be drilled with extra caution to prevent operator injury. The component should lock into a vice or connect to other metal components to prevent the workpiece from moving. It should be running slowly to prevent abrasive wear on the moving parts. Also, lubrication needs to be supplied more frequently.
When a machine is operating in extremely cold temperatures, it should operate slowly. Before accelerating the speed, let the components and lubricants warm up.
Due to the use of power equipment in drilling operations, safety precautions must be considered. It must be considered to avoid harming the machinery, the operator, and others. The work must be maintained and set up carefully to prevent this, and the appropriate tools should be chosen. To prevent damage, the holding mechanism should also be in good shape.
Among the drilling machine's many benefits are the following:
The numerous problems and solutions relating to drilling are listed below:
Reduce the feed, please.
Regrounding point.
Utilized coolant.
The fixture's stiffness made sure.
If the drill becomes dull, it could break.
The chips have clogged the flute.
Because of increased feed.
Improper work and drill clamping
The multi-point drill bit spins with the cutting tool. At hundreds to thousands of revolutions per minute, the drill is turned while tightly pressed against the workpiece. The cutting edge removes chips from the workpiece by cutting them off with the given force. Look out for the advantages and disadvantages mentioned above to know whether or not it's a good fit for you!
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