Kunshan Meiyaxing Hardware Machinery Co., Ltd., a direct branch of Hong Kong Meiya International Trading Co., Ltd., owns its own tool brand: MANF, and engages in the sales and operation of CNC cutting tools. It provides tungsten carbide end mills, milling inserts, turning inserts, grooving and parting inserts, drilling and boring inserts, multi-functional inserts, threading inserts, and other indexable inserts and their matching tool holders and tool holders. Furthermore, it has established long-term strategic partnerships with several well-known manufacturers, jointly developing R&D, design, and production teams, utilizing advanced equipment and continuously innovating technological capabilities, committed to mutual cooperation and a technology-service-oriented approach. This forms a mutually supportive industrial chain, solving various processing problems for manufacturing enterprises.
Drill bits are ubiquitous tools in industrial manufacturing, construction, and even DIY crafts. However, it is precisely this "commonness" that causes many to overlook their technical complexity. Have you ever encountered situations where drill bits wear out quickly, the hole walls become rough, or even break on the spot? Often, the problem isn't with the equipment or the operator, but rather with the drill bit selection not matching the intended use.
III. Choosing by "Structure and Purpose": Corresponding Strategies for Different Scenarios
After selecting the right material, consider the structure. Different structures correspond to completely different usage scenarios.
· Twist drill: The most standard type, suitable for most through holes and blind holes. However, its disadvantages include a long chisel edge, poor centering, and difficulty in chip removal when drilling shallow holes (more than 5 times the diameter), requiring frequent retraction.
* Center drill: This is not for drilling holes, but for creating centering holes. It is used before actual drilling, especially on CNC machine tools, to create a guide pit to prevent the subsequent long drill bit from "drifting off course." This is a crucial step that many people omit.
* Step drill: A single drill bit can process multiple diameters and can complete chamfering in one pass. Used for: Hole drilling in thin plates (such as sheet metal, electrical cabinet wiring holes), or situations requiring countersunk head recesses; extremely efficient.
* Internally cooled drill: The tool body has internal coolant channels. Used for: Deep hole machining (more than 5 times the diameter) or high-volume automated machining; internally cooled drills must be used to deliver high-pressure cutting fluid directly to the cutting edge, cooling and flushing away chips.
IV. Coatings: The Overlooked "Performance Multiplier"
The same material, different coatings, vastly different applications.
* **Uncoated:** Only suitable for soft materials or woodworking; limited applications.
* **Titanium Nitride Coating (Gold):** General purpose, increases hardness, suitable for ordinary steel and non-ferrous metals.
* **Titanium Aluminum Nitride/Titanium Aluminum Nitride Coating (Black-Purple/Blue-Gray):** Excellent high-temperature resistance; suitable for dry cutting or high-speed machining of cast iron and stainless steel, forming an aluminum oxide protective layer on the surface.
* **Diamond-Like Carbon Coating:** Excellent for non-ferrous metals (aluminum, copper), providing excellent anti-sticking properties.
Application Scenarios | Recommended Drill Bit Type | Key Precautions
* **Hand Drilling Ordinary Steel/Wood:** High-speed steel twist drill; avoid high speeds, add coolant or grease.
* **Drilling Stainless Steel (304/316):** Cobalt-containing high-speed steel or cemented carbide; use low speed and high feed to avoid work hardening.
* **Drilling Cast Iron or Hardened Steel (HRC50):** Carbide drill bit (Titanium Aluminum Nitride coating). The machine tool should have sufficient rigidity, preferably with internal cooling.
Drilling thin aluminum alloy plates: Use a carbide step drill for high-speed cutting, paying attention to chip removal and preventing chip adhesion.
Drilling deep holes (>5 times the diameter): Use an internally cooled carbide drill bit with a pecking cycle, periodically removing chips.
Precision positioning holes: Use a center drill + carbide drill bit. Drill the center hole first, then change the tool to drill the main hole.
Don't just focus on the drill bit and ignore the regrinding process in "when to use". A new drill bit may be sharp, but after drilling a few holes, the cutting edge condition will begin to change. The true judgment of when to use a drill bit is not based on "how many times it has been used", but on observing the chip color-if the chips are bluish or purple, it indicates that the temperature is too high, and either the speed should be reduced, or the tool should be changed or regrinded.
If you have any questions about MANF brand tools, please call us for consultation or negotiation"
Contact us:Company name:Kunshan Meiyaxing Hardware Machinery Co., Ltd;Tel:8618962438699;Address: Room 3003, Building 3, Zhengtailong, No. 1288 Chengbei Middle Road, Kunshan City, Jiangsu Province, China;Email:myxcuttingtools@gmail.com;Website: https://www.myxcuttingtools.com
