You should learn about mining inserts and various mining bits tipped with them, whether you work for crude&gas industry, mining industry, or construction. I can see why it comes cause you realize works in these industries, more knowledge of tools you obtain, less hazardous condition and risk your guys will confront. As a manufacturer with exportation of mining tips gradually taking up one fourth of our whole annual throughput, we are thrilled to write this blog sharing some fundamental stuff about carbide mining tips that we are fabricating and familiar with. It couldn’t be better if it assists in knowing the categories of drilling tips made of carbide and what mining rigs they are used on.

*記録として、Meetyou カーバイド株式会社のすべてのコンテンツは、個人的な経験の補足を目的としており、専門的な技術的判断に代わるものではありません。

What-to-know about 4 types of carbide mining bits commonly consumed in modern mining industry? 2


All mining tips are designed for ensuring themself as durable as possible regardless of the rock and dribs involved. whether made of pure WC-Co carbide or sintered polycrystalline diamond&carbide compact, they are both characterized by their unique particle size and distribution of Co atoms offering themselves outstanding abrasion resistance, compact toughness, and the foremost stiffness against heat deformation.

粒度: In contrast with powders of carbide cutting tools, those of mining inserts are supposed to be as big as possible which normally reach up to from 0.4μm to 3.5μm in diameter. Simply put, that’s because on the microscopic level if a cracking occurs , it has to either pass through WC particles or get around them in a zigzag way. No matter which way the cracking goes, WC particles in bigger grain size cost it more fracture energy to penetrate, and meanwhile more surface area to skirt around. Consequently, the cracking propagation can be restrained. Statistic shows coarse carbide is 20% to 30% stronger than conventional carbide in toughness.

写真 1. 3.5μm WC-Co カーバイドの金属組織。
写真 1. 3.5μm WC-Co カーバイドの金属組織。

Coの分布: 一方、近年、浸炭処理の技術が進歩し、Co が炭化物部分の周辺部から中心部に移動し、コア部の Co が多く、外側の Co が少なくなります。多くの実験により、Co の分布を含む超硬部品 (いわゆる二相超硬合金) は、通常の設計の超硬部品と比較して、外装はより摩耗しやすく、内装は耐衝撃性に優れていることが証明されています。

pic.2 Coの分布とマイニングビットの硬度への影響
pic.2 Coの分布とマイニングビットの硬度への影響


Percussion mining bits: DTH掘削リグと電動削岩機、

Rotary mining bits: コーンビット、シールドTBMスクレーパー(地中掘削用)、カッティングピック(圧造機・石炭カッター用)

鉱業における付属品 そのような コンベアベルトスクレーパーブレード(廃棄物・汚物洗浄システム)等


Percussion rock mining bit

Exactly as its name implies, The function of percussion rock mining bits is largely dependent on the principle of percussion mechanism. Its built-in motor generates a percussive energy periodically thrust its bore head into ground creating many crackings and within each interval, the bore head rotates at a certain degree, which results in all overburden in the area that the rock mining bit covers gets smashed into small debris. Then a compressed air or a stream of high-pressure fluid comes out from a hole in bore stem and flush away all debris to form a round hole.

In general, percussion rock drills are utilized for two main purposes, the first of which is to bore blast holes for filling with explosives. Secondly, It used for crashing some solid material for good, such as cement blocks.

There are 3 types of carbide drill heads on percussion rock mining bit available in our store, showed in the picture.

What-to-know about 4 types of carbide mining bits commonly consumed in modern mining industry? 3

Rotary rock mining bit

Differing from percussion bits, rotary rock drill burrow itself into earth’s face relying on its cutting edge, where rocks get by rotary toque and longitudinal thrust. There are cone drill, coal electric jackdrill, coal cutting pick, rock core drill, and TBM scraper blade falling into this category.


超硬または PDC 基板をデュアル ウィング ビットに溶接したこの種のポータブル ドリルは、石炭層の表面に短いルーフ ボルト サポート穴と発破穴をボーリングするために使用されます。手動操作中に発生する過度の粉塵集中を避けるために、通常、深さ 1 ~ 2m、直径 45mm 未満の穴に適用できます。

What-to-know about 4 types of carbide mining bits commonly consumed in modern mining industry? 4

Cone mining bit

ローラー コーン ビットとも呼ばれます。これは、通常、ドリル ストリングに 2 つまたは 3 つの回転する円錐形のサブ ビットが取り付けられているためです。これにより、中程度の硬い岩層に直径 280 ~ 440 mm の発破孔を掘削する際の効率が大幅に向上し、直径が最大になります。 300mmまで。

ところで、コーンビットを選ぶ際に最も重視するのは岩石の硬度です。硬く形成するには歯の短いコーン ビットが必要ですが、軟らかく形成するにはその逆が必要です。

In most time, carbide tips with high toughness and hardness are adopted on cone bits.  These tips are devised in different shapes (showed as below) in order to gain prominent cutting ability. A layer of wear-resisting hardfacing covers the whole bit body for high wear resistance and prolonged tool life.

What-to-know about 4 types of carbide mining bits commonly consumed in modern mining industry? 5

PDC mining bit(Polycrystalline diamond compact)

Another appropriate rotary drilling bit is PCD(poly crystalline diamond) embedded mining bit. Unlike roller cone drills, PDC drills belong to a sort of fix-cutter drag bit since they don’t have rotating cones and have to operate as a solid unit. All cutting movement is achieved in form of scraping materials by artificial diamond compact in various patterns. The diamond is sinterred into to a carbide matrix to form a integrated substrate. Admittedly PDC mining bits are capable of drilling stratum in compact strength less than 18000PSI and rock abrasiveness less than 41°. which means they are quite suitable for dealing with soft to medium hard materials, such as halite, gypsum, marlstone, limestone.

There are two common types of existence of PDC mining bits,




Selecting principle


Please Visit our website and mining community for more information on tools used for mining exploration, processing,lab analysis, and safety.


メールアドレスが公開されることはありません。 が付いている欄は必須項目です