JPS6312998B2 - - Google Patents
Info
- Publication number
- JPS6312998B2 JPS6312998B2 JP4684583A JP4684583A JPS6312998B2 JP S6312998 B2 JPS6312998 B2 JP S6312998B2 JP 4684583 A JP4684583 A JP 4684583A JP 4684583 A JP4684583 A JP 4684583A JP S6312998 B2 JPS6312998 B2 JP S6312998B2
- Authority
- JP
- Japan
- Prior art keywords
- bit
- matrix alloy
- alloy
- chip
- carbide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 229910045601 alloy Inorganic materials 0.000 claims description 47
- 239000000956 alloy Substances 0.000 claims description 47
- 239000011159 matrix material Substances 0.000 claims description 28
- 238000005553 drilling Methods 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 238000002513 implantation Methods 0.000 claims description 4
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 239000000843 powder Substances 0.000 description 19
- 239000010410 layer Substances 0.000 description 12
- 238000005452 bending Methods 0.000 description 7
- 239000011230 binding agent Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000009412 basement excavation Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000011812 mixed powder Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910009043 WC-Co Inorganic materials 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- -1 alloys) Chemical class 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000002952 polymeric resin Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920003169 water-soluble polymer Polymers 0.000 description 2
- 229910000952 Be alloy Inorganic materials 0.000 description 1
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910020637 Co-Cu Inorganic materials 0.000 description 1
- 229910019819 Cr—Si Inorganic materials 0.000 description 1
- 229910017532 Cu-Be Inorganic materials 0.000 description 1
- 229910017758 Cu-Si Inorganic materials 0.000 description 1
- 229910017816 Cu—Co Inorganic materials 0.000 description 1
- 229910017931 Cu—Si Inorganic materials 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910017112 Fe—C Inorganic materials 0.000 description 1
- 229910000733 Li alloy Inorganic materials 0.000 description 1
- 229910000914 Mn alloy Inorganic materials 0.000 description 1
- 229910018651 Mn—Ni Inorganic materials 0.000 description 1
- 229910017709 Ni Co Inorganic materials 0.000 description 1
- 229910003267 Ni-Co Inorganic materials 0.000 description 1
- 229910018054 Ni-Cu Inorganic materials 0.000 description 1
- 229910003286 Ni-Mn Inorganic materials 0.000 description 1
- 229910003262 Ni‐Co Inorganic materials 0.000 description 1
- 229910018481 Ni—Cu Inorganic materials 0.000 description 1
- 229910020888 Sn-Cu Inorganic materials 0.000 description 1
- 229910019204 Sn—Cu Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000001989 lithium alloy Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229910021484 silicon-nickel alloy Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001256 stainless steel alloy Inorganic materials 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
Landscapes
- Earth Drilling (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は掘削用ビツト及びその製造方法に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a drilling bit and a method for manufacturing the same.
通常さく岩用ビツトの製造方法として、次の如
き方法がある。即ち、カーボンモールドの中に超
硬合金刃先を植付け、モールド内面に表面硬装部
形成用のスケルトン粉末を展着させた後、モール
ド内にマトリツクス合金部形成用のスケルトン粉
末を充填する。次いでこのモールド内に、バイン
ダー合金の溶湯を浸透させて全体として焼結させ
るものである。
The following methods are commonly used to manufacture rock drilling bits. That is, a cemented carbide cutting edge is planted in a carbon mold, skeleton powder for forming a hard surface portion is spread on the inner surface of the mold, and then skeleton powder for forming a matrix alloy portion is filled into the mold. Next, a molten binder alloy is infiltrated into this mold and the entire mold is sintered.
第１図はこのようにして製造されたビツトの刃
先部の断面図であつて、超硬合金チツプ１０がマ
トリツクス合金部１２に植え付けられており、こ
のマトリツクス合金部１２の表面が表面硬装部
（硬質層）１４によつて被装されている。なお、
これら表面硬装部１４及びマトリツクス合金部１
２は、それぞれのスケルトン粉末にバインダー合
金が溶浸されて構成されている。 FIG. 1 is a sectional view of the cutting edge of the bit manufactured in this manner, in which a cemented carbide chip 10 is planted in a matrix alloy part 12, and the surface of this matrix alloy part 12 is a surface hardened part. (hard layer) 14. In addition,
These hard surface parts 14 and matrix alloy parts 1
No. 2 is constructed by infiltrating each skeleton powder with a binder alloy.
しかるに、このようにして製造された従来のビ
ツトにおいては、重荷重掘削の使用時に超硬チツ
プの欠損が生ずる傾向が認められ、耐衝撃性が低
いという問題があつた。 However, in conventional bits manufactured in this manner, there was a problem that the carbide tips tended to break when used for heavy-duty excavation, and the impact resistance was low.
本発明の目的は、上記従来技術の問題点を解決
し、超硬チツプ欠損のおそれが解消され、耐衝撃
特性の優れた掘削用ビツト及びその製造方法を提
供することにある。
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, eliminate the fear of chipping of the carbide chip, and provide a drilling bit with excellent impact resistance and a method for manufacturing the same.
本発明はこの目的を達成するために次を要旨と
するものである。
In order to achieve this object, the present invention has the following gist.
即ち第１の発明は
ビツト本体を構成するマトリツクス合金に超硬
チツプが植設されてなり、かつマトリツクス合金
の表面が硬質層で被装された掘削用ビツトにおい
て、前記超硬チツプの側周面と硬質層及びマトリ
ツクス合金との間には植設深さ方向に延在する間
隙が形成されていることを特徴とする掘削用ビツ
トである。 That is, the first invention is a drilling bit in which a cemented carbide tip is embedded in a matrix alloy constituting the bit body, and the surface of the matrix alloy is coated with a hard layer, which provides a side peripheral surface of the carbide tip. This drilling bit is characterized in that a gap extending in the direction of the planting depth is formed between the hard layer and the matrix alloy.
また第２の発明は
ビツト本体を構成するマトリツクス合金に超硬
チツプが植設されてなり、かつマトリツクス合金
の表面が硬質層で被装された掘削用ビツトにおい
て、前記超硬チツプの周囲にレーザビームを照射
し、超硬チツプの側周面と硬質層及びマトリツク
ス合金との間に、植設深さ方向に延在する間隙を
形成することを特徴とする掘削用ビツトの製造方
法である。 A second invention is an excavation bit in which a cemented carbide tip is embedded in a matrix alloy constituting the bit body, and the surface of the matrix alloy is coated with a hard layer, in which a laser beam is applied around the carbide tip. This method of producing a drilling bit is characterized by irradiating the bit with a beam to form a gap extending in the direction of the implantation depth between the side peripheral surface of the cemented carbide tip, the hard layer, and the matrix alloy.
以下、本発明をさらに詳細に説明する。 The present invention will be explained in more detail below.
第２図は本発明の実施例に係るビツトの刃先部
の断面図である。この実施例においては、超硬チ
ツプ１０側周面の表面硬装部（硬質層）１４とマ
トリツクス合金部１２との間には間隙１６が形成
されている。このような間隙１６を設けると、チ
ツプに作用するせん断力が小さくなり、チツプの
欠損が解消されるのである。この理由については
次の様に推察される。即ち、第３図に示す如く、
チツプに対して横方向の荷重Ｍが作用すると、表
面硬装部及びマトリツクス合金からは反作用とし
てチツプに対して反力Ｆが加えられる。ところ
で、ビツト製造に際しては、上記従来技術の項で
説明した如く、溶浸法が採用される。この溶浸法
に基く製造においては、バインダー合金の溶湯を
粉末間隙に流し込んで凝固させるに際し、マトリ
ツクス合金部１２及び表面硬装部１４には収縮が
生じ、この収縮によつて超硬チツプ１０が強く締
め付けられて保持される。しかして表面硬装部１
４の硬度はマトリツクス合金１２の硬度よりも高
いところから、超硬チツプ１０に荷重Ｍ（第３図
参照）が作用すると、表面硬装部１４における上
記反力Ｆが大きくなり、これによりチツプ１０の
先端部分に大きなせん断力が生じ、これが所定限
度以上になるとチツプをして欠損に到らしめる。 FIG. 2 is a sectional view of the cutting edge of the bit according to the embodiment of the present invention. In this embodiment, a gap 16 is formed between a surface hardening portion (hard layer) 14 on the peripheral surface of the carbide chip 10 and the matrix alloy portion 12. Providing such a gap 16 reduces the shearing force acting on the chip and eliminates chipping. The reason for this is inferred as follows. That is, as shown in Figure 3,
When a lateral load M acts on the chip, a reaction force F is applied to the chip as a reaction from the hard surface portion and the matrix alloy. Incidentally, when manufacturing bits, the infiltration method is employed as explained in the section of the prior art described above. In manufacturing based on this infiltration method, when the molten binder alloy is poured into the powder gap and solidified, the matrix alloy part 12 and the hard surface part 14 shrink, and this shrinkage causes the cemented carbide chip 10 to shrink. It is tightly tightened and held. However, the surface hardening part 1
4 is higher than the hardness of the matrix alloy 12, so when a load M (see FIG. 3) is applied to the carbide chip 10, the reaction force F at the hard surface portion 14 becomes large, and as a result, the chip 10 A large shearing force is generated at the tip of the tip, and if this exceeds a predetermined limit, it will chip and cause damage.
しかるに、本発明の如くチツプ１０の周囲に間
隙１６を設けるようにすると、チツプ１０に対し
て横方向荷重Ｍが作用した際に表層部からはチツ
プ１０に対して反力Ｆが加えられず、従つてチツ
プ１０に生ずるせん断力も小さなものとなつて欠
損が防止されるようになるのである。 However, if the gap 16 is provided around the chip 10 as in the present invention, when a lateral load M is applied to the chip 10, no reaction force F is applied to the chip 10 from the surface layer, and Therefore, the shearing force generated on the chip 10 is also reduced, and chipping is prevented.
このような空隙１６の幅ｔ及び深さｌについて
の好適な値について次に説明する。まず幅ｔにつ
いては、発明者らが鋭意研究を重ねた結果、40〜
400μmとすると好適であることが見出された。第
４図はこの研究結果の一例を示すグラフであり、
型式、大きさ等の異なる多数のチツプについて荷
重Ｍを加えたときの曲げ強度を測定したものの一
例である。この第４図より、ｔ値が40〜400μmと
りわけ80〜320μmであるときに、極めて優れた結
果を与えることが明瞭に認められる。 Preferred values for the width t and depth l of such a gap 16 will be described next. First, as for the width t, as a result of intensive research by the inventors, we found that the width t is 40~
It has been found that 400 μm is suitable. Figure 4 is a graph showing an example of the results of this research.
This is an example of measurements of bending strength when a load M is applied to a large number of chips of different types and sizes. From FIG. 4, it is clearly seen that extremely excellent results are obtained when the t value is 40 to 400 μm, especially 80 to 320 μm.
次に深さｌについては超硬チツプ植え込み深さ
Ｌに対しｌ／Ｌ×100（％）値が30〜85％とりわけ
40〜80％となるようにするのが好適である。第５
図はｌ／Ｌ×100（％）値を種々変更した場合につ
いて荷重Ｍを加えたときの曲げ強度を測定したも
のの一例である。この第５図よりｌ／Ｌ×100
（％）値としては30〜85とりわけ40〜80（％）が好
適であることが認められる。 Next, regarding the depth l, the l/L x 100 (%) value is 30 to 85% of the carbide chip implantation depth L.
It is preferable to set it to 40 to 80%. Fifth
The figure shows an example of the bending strength measured when a load M was applied when the l/L×100 (%) value was variously changed. From this figure 5, l/L×100
It is recognized that the (%) value is preferably 30 to 85, especially 40 to 80 (%).
このように第１の発明に係るビツトは第２の発
明に係る方法に従つて製造することができる。第
６図は第２の発明の実施例を示す断面図である。
即ち、１８はモールドであり、このモールド１８
内面に超硬チツプ１０を配置しモールド内壁面に
表面硬装部形成用のスケルトン粉末２２を貼着し
た後、マトリツクス合金部形成用のスケルトン粉
末２４を充填する。そして湯道２６から溶湯を注
入し、凝固せしめた後、脱型し、まずビツトをほ
ぼ完成品形状として作製するのである。しかる
後、第７図に示す如く超硬チツプ１０の周囲にレ
ーザビーム３０を照射し、超硬チツプ１０の側周
面と表面硬装部（硬質層）１４及びマトリツクス
合金部１２との間に、植設深さ方向に延在する間
隙１６を形成させるのである。この際レーザビー
ムの強度、照射時間などの諸条件を選定すること
により、所望幅及び所望深さの間隙１６を形成す
ることが可能である。第７図中３２はレーザ加工
機のノズルである。 Thus, the bit according to the first invention can be manufactured according to the method according to the second invention. FIG. 6 is a sectional view showing an embodiment of the second invention.
That is, 18 is a mold, and this mold 18
After arranging the carbide chips 10 on the inner surface and pasting skeleton powder 22 for forming a hard surface portion on the inner wall surface of the mold, skeleton powder 24 for forming a matrix alloy portion is filled. Then, molten metal is injected through the runner 26, solidified, and then removed from the mold to produce a bit in an almost finished shape. Thereafter, as shown in FIG. 7, a laser beam 30 is irradiated around the carbide chip 10 to create a gap between the side peripheral surface of the carbide chip 10, the hard surface portion (hard layer) 14, and the matrix alloy portion 12. , a gap 16 extending in the planting depth direction is formed. At this time, by selecting various conditions such as the intensity of the laser beam and the irradiation time, it is possible to form the gap 16 with a desired width and depth. 32 in FIG. 7 is a nozzle of a laser processing machine.
この第２の発明において、硬質層形成用スケル
トン粉末としては、各種のものが採用可能であ
り、各種の硬質の金属（合金を含む）、硬質の金
属炭化物、これらを組み合わせたものなどが好適
である。具体的には例えば、WCとCoとの混合粉
末、Ｗ，WC，W2C，Cr3C2などが挙げられる。 In this second invention, various types of skeleton powder for forming the hard layer can be used, and various types of hard metals (including alloys), hard metal carbides, and combinations thereof are preferable. be. Specific examples include a mixed powder of WC and Co, W, WC, W 2 C, Cr 3 C 2 , and the like.
この硬質粉末をモールド内面に貼着させるに際
しては水溶性高分子樹脂などの接着剤を用いるよ
うにしても良い。 When adhering this hard powder to the inner surface of the mold, an adhesive such as a water-soluble polymer resin may be used.
マトリツクス合金形成用スケルトン粉末として
も、各種の金属（合金を含む）、金属炭化物、金
属・炭素複合物、これらを組み合わせたもの、な
どが採用可能であり、さらにこれらに炭素を加え
るようにしても良い。例えば、Fe，Ni，Co，
Ｗ，炭素鋼、ステンレス鋼、Fe・Mn合金、WC，
W2C，Cr3C2，TaC，TiC，VC，NbCなどを単
独でもしくは組み合わせて用いることができる。 Various metals (including alloys), metal carbides, metal/carbon composites, and combinations of these can be used as skeleton powders for forming matrix alloys, and carbon can also be added to these. good. For example, Fe, Ni, Co,
W, carbon steel, stainless steel, Fe/Mn alloy, WC,
W 2 C, Cr 3 C 2 , TaC, TiC, VC, NbC, etc. can be used alone or in combination.
バインダー合金としては、スケルトン粉末より
も低い融点を有しており、機械的強度、耐摩耗
性、耐食性に優れ、高温における強度低下の小さ
いものが好適である。具体的にはMn−Ni−Cu系
合金、Mn−Ni−Cu−Si系合金、アルミニウム青
銅、高力黄銅、Mn−Co−Cu系合金、Mn−Ni−
Cu−Si−Li系合金、Ni−Sn−Cu系合金、Ni−Si
合金、Ni−Be合金、Cu−Be合金、Ni−Ｂ−Si
−Fe−Ｃ系合金、Pd−Ni−Mn系合金、Mn−Ni
系合金、Mn−Ni−Co系合金、Ni−Cr−Si系合
金、Mn−Ni−Cu−Co系合金などが挙げられる。 The binder alloy is preferably one that has a lower melting point than the skeleton powder, has excellent mechanical strength, abrasion resistance, and corrosion resistance, and has a small decrease in strength at high temperatures. Specifically, Mn-Ni-Cu alloy, Mn-Ni-Cu-Si alloy, aluminum bronze, high-strength brass, Mn-Co-Cu alloy, Mn-Ni-
Cu-Si-Li alloy, Ni-Sn-Cu alloy, Ni-Si
Alloy, Ni-Be alloy, Cu-Be alloy, Ni-B-Si
-Fe-C alloy, Pd-Ni-Mn alloy, Mn-Ni
Examples include Mn-Ni-Co-based alloys, Ni-Cr-Si-based alloys, Mn-Ni-Cu-Co-based alloys, and the like.
また、本発明においては超硬チツプもその形
状、材質、大きさなどに制限はなく、例えば、ボ
タン型、コニカル型、チゼル型など各種形状のも
のが採用可能である。 Further, in the present invention, there are no restrictions on the shape, material, size, etc. of the carbide tip, and various shapes such as a button shape, a conical shape, and a chisel shape can be employed.
実施例 １
第６図に示されるモールド１８を用いて掘削用
ビツトを製造した。まず超硬チツプ１０（材質
WC−Co系超硬合金）をモールド１８内に配置し
た。次いで、モールド１８の内壁面に表面硬装部
（硬質層）形成用のスケルトン粉末として、Ｗ粉
末（粒径；325メツシユ以上200メツシユ以下）50
重量部とWC粉末（粒径；300メツシユ以上150メ
ツシユ以下）50重量部との混合粉末を用い、これ
をモールド１８内壁面２０に貼着した。なお、こ
の貼着に際しては水溶性高分子樹脂からなる接着
剤を少量使用した。
Example 1 A drilling bit was manufactured using the mold 18 shown in FIG. First, carbide tip 10 (material
WC-Co-based cemented carbide) was placed in the mold 18. Next, 50 W powder (particle size: 325 meshes or more and 200 meshes or less) is used as a skeleton powder for forming a hard surface part (hard layer) on the inner wall surface of the mold 18.
A mixed powder of 50 parts by weight of WC powder (particle size: 300 mesh or more and 150 mesh or less) was used and was adhered to the inner wall surface 20 of the mold 18. In this attachment, a small amount of adhesive made of water-soluble polymer resin was used.
次いでマトリツクス合金部形成用のスケルトン
粉末として、Fe粉末（粒径；100メツシユ以下）
85重量部とNi粉末（粒径200メツシユ以下）15重
量部との混合粉末をモールド１８内に装入した。
その後バインダー合金の溶湯を湯道２６からモー
ルド１８内に流し込み、冷却して凝固させた。な
おバインダー合金の組成は、Mn25wt％、
Ni15wt％、Cu60wt％である。 Next, Fe powder (particle size: 100 mesh or less) was used as the skeleton powder for forming the matrix alloy part.
A mixed powder of 85 parts by weight and 15 parts by weight of Ni powder (particle size of 200 mesh or less) was charged into the mold 18.
Thereafter, the molten binder alloy was poured into the mold 18 through the runner 26, cooled, and solidified. The composition of the binder alloy is Mn25wt%,
Ni is 15wt% and Cu is 60wt%.
しかる後モールド１８を脱型し、内容物即ちほ
ぼ完成品形状とされたビツトを取り出した。そし
てその超硬チツプ１０の周囲にレーザビーム３０
を照射し間隙１６を形成した。レーザビームの強
度、焦点深度、照射時間を種々変更することによ
り、幅ｔ及び深さｌの異なる多数種類のビツトを
製造した。なお超硬合金チツプの材質はWC−Co
系超硬合金であり、直径ｄ＝12mm、植え込み深さ
Ｌ＝９mmである。 Thereafter, the mold 18 was demolded and the contents, ie, the bits in the shape of an almost finished product, were taken out. A laser beam 30 is placed around the carbide chip 10.
was irradiated to form a gap 16. By varying the intensity, depth of focus, and irradiation time of the laser beam, many types of bits with different widths t and depths l were manufactured. The material of the cemented carbide chip is WC-Co.
It is made of cemented carbide, with a diameter d = 12 mm and an implantation depth L = 9 mm.
このようにして製造された、第２図の如き刃先
部を有するビツトについて、第３図に示す如き荷
重Ｍを超硬チツプ１０に加え、欠損に到るまでの
曲げ強度を測定した。その結果の一例を第４図及
び第５図に示す。 For the thus manufactured bit having the cutting edge portion as shown in FIG. 2, a load M as shown in FIG. 3 was applied to the carbide tip 10, and the bending strength until breakage was measured. An example of the results is shown in FIGS. 4 and 5.
第４図には間隙１６の深さｌ＝６mmと一定に
し、その幅ｔを０〜500μm（ｔ／ｄ×100（％）で
０〜4.2％）で変えた場合の曲げ強度が示されて
いる。 Figure 4 shows the bending strength when the depth l of the gap 16 is constant at 6 mm and the width t is varied from 0 to 500 μm (0 to 4.2% in t/d x 100 (%)). There is.
第５図には間隙１６の幅ｔ＝200μmと一定に
し、その深さｌを０〜９mmの範囲（ｌ／Ｌ×100
（％）で０〜100％）で変えた場合の曲げ強度が示
されている。なおマトリツクス合金部の硬度
（HRＢ）は88.4、表面硬装部の硬度（HRＣ）は
34.0であつた。 In FIG. 5, the width t of the gap 16 is constant at 200 μm, and the depth l is in the range of 0 to 9 mm (l/L×100 μm).
The bending strength is shown when it is changed in (%) from 0 to 100%). The hardness of the matrix alloy part (H R B) is 88.4, and the hardness of the hard surface part (H R C) is
It was 34.0.
実施例 ２
マトリツクス合金部形成用スケルトン粉末とし
て、Fe粉末（粒径；100メツシユ以下）70重量部
とCo粉末（粒径；100メツシユ以下325メツシユ
以上）との混合粉末を用いると共に、バインダー
合金としてMn40wt％、Ni30wt％、Cu30wt％の
ものを用いた以外は実施例１と同様にして試験を
行なつたところ、実施例１と同様の結果が得られ
た。なお、マトリツクス合金部の硬度（HRＢ）
は95.2、表面硬装部の硬度（HRＣ）は42.7であつ
た。Example 2 A mixed powder of 70 parts by weight of Fe powder (particle size: 100 mesh or less) and Co powder (particle size: 100 mesh or less, 325 mesh or more) was used as the skeleton powder for forming the matrix alloy part, and as a binder alloy. A test was conducted in the same manner as in Example 1 except that Mn was 40 wt%, Ni was 30 wt%, and Cu was 30 wt%, and the same results as in Example 1 were obtained. In addition, the hardness of the matrix alloy part (H R B)
was 95.2, and the hardness (H R C) of the hard surface part was 42.7.
実施例１によつて製造されたビツトを備えたト
リコンビツト（７５／８インチ、IJ−10メタルイン
サート型トリコンビツト）を用いて岩石掘削試験
を行なつた。ビツト荷重を種々変えて掘削速度を
求めた。結果を第８図に示す。なおビツト回転数
は50R.P.M.、送水は清水を用い、800l／minの送
水量とした。岩石は甲府安山岩及び塩山花崗岩で
ある。 A rock drilling test was conducted using a tricomb bit (75/8 inch, IJ-10 metal insert type tricomb bit) equipped with the bit manufactured in accordance with Example 1. The excavation speed was determined by varying the bit load. The results are shown in FIG. The bit rotation speed was 50 R.PM, and fresh water was used for water supply, with a water flow rate of 800 l/min. The rocks are Kofu andesite and Enzan granite.
比較例として従来品トリコンビツト（第１図の
構成のもの）を用いて同様の掘削試験を行なつ
た。その結果を併せて第８図に示す。第８図よ
り、本発明品が従来品に比べて、特に強い衝撃の
加えられる高ビツト荷重領域における掘削性に優
れていることが認められる。 As a comparative example, a similar excavation test was conducted using a conventional tricomb bit (configured as shown in Figure 1). The results are also shown in FIG. From FIG. 8, it can be seen that the product of the present invention is superior to the conventional product in excavation performance particularly in the high bit load region where strong impact is applied.
以上の通り、本発明によれば、超硬チツプ欠損
のおそれなどのない、耐衝撃特性に優れた掘削用
ビツトが得られる。
As described above, according to the present invention, it is possible to obtain a drilling bit with excellent impact resistance and no fear of chipping of the carbide chip.
第１図は従来のビツト刃先部の断面図、第２図
は本発明の実施例に係るビツト刃先部の断面図、
第３図はチツプに加えられる外力を示す図、第４
図は軟質層の幅員とチツプ曲げ強度との関係を示
すグラフ、第５図は軟質層の深さとチツプ曲げ強
度との関係を示すグラフ、第６図は本発明の製造
方法を示すモールド断面図、第７図は本発明の製
造方法を示すレーザ照射時の刃先部断面図、第８
図はビツト荷重と掘削速度との関係を示すグラフ
である。
１０……超硬チツプ、１２……マトリツクス合
金、１４……表面硬装部（硬質層）、１６……間
隙、１８……モールド、３０……レーザビーム。
FIG. 1 is a cross-sectional view of a conventional bit cutting edge, and FIG. 2 is a cross-sectional view of a bit cutting edge according to an embodiment of the present invention.
Figure 3 shows the external force applied to the chip, Figure 4 shows the external force applied to the chip.
The figure is a graph showing the relationship between the width of the soft layer and the chip bending strength. Figure 5 is a graph showing the relationship between the depth of the soft layer and the chip bending strength. Figure 6 is a cross-sectional view of a mold showing the manufacturing method of the present invention. , FIG. 7 is a sectional view of the cutting edge during laser irradiation, showing the manufacturing method of the present invention, and FIG.
The figure is a graph showing the relationship between bit load and excavation speed. DESCRIPTION OF SYMBOLS 10... Carbide chip, 12... Matrix alloy, 14... Surface hardening part (hard layer), 16... Gap, 18... Mold, 30... Laser beam.
Claims (1)
硬チツプが植設されてなり、かつマトリツクス合
金の表面が硬質層で被装された掘削用ビツトにお
いて、前記超硬チツプの側周面と硬質層及びマト
リツクス合金との間には植設深さ方向に延在する
間隙が形成されていることを特徴とする掘削用ビ
ツト。 ２ ビツト本体を構成するマトリツクス合金に超
硬チツプが植設されてなり、かつマトリツクス合
金の表面が硬質層で被装された掘削用ビツトにお
いて、前記超硬チツプの周囲にレーザビームを照
射し、超硬チツプの側周面と硬質層及びマトリツ
クス合金との間に、植設深さ方向に延在する間隙
を形成することを特徴とする掘削用ビツトの製造
方法。[Scope of Claims] 1. A drilling bit in which a cemented carbide tip is embedded in a matrix alloy constituting the bit body, and the surface of the matrix alloy is coated with a hard layer, wherein the side periphery of the carbide tip is A drilling bit characterized in that a gap extending in the direction of the planting depth is formed between the surface, the hard layer, and the matrix alloy. 2. In a drilling bit in which a carbide chip is embedded in a matrix alloy constituting the bit body, and the surface of the matrix alloy is coated with a hard layer, irradiating the periphery of the carbide chip with a laser beam, A method for producing a drilling bit, characterized by forming a gap extending in the direction of the implantation depth between the side peripheral surface of the carbide tip, the hard layer, and the matrix alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4684583A JPS59173480A (en) | 1983-03-18 | 1983-03-18 | Bit for excavation and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4684583A JPS59173480A (en) | 1983-03-18 | 1983-03-18 | Bit for excavation and manufacture thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59173480A JPS59173480A (en) | 1984-10-01 |
| JPS6312998B2 true JPS6312998B2 (en) | 1988-03-23 |
Family
ID=12758674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4684583A Granted JPS59173480A (en) | 1983-03-18 | 1983-03-18 | Bit for excavation and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59173480A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE534206C2 (en) * | 2009-10-05 | 2011-05-31 | Atlas Copco Secoroc Ab | Carbide pins for a drill bit for striking rock drilling, drill bit and method of grinding a cemented carbide pin |
-
1983
- 1983-03-18 JP JP4684583A patent/JPS59173480A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59173480A (en) | 1984-10-01 |
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