JPS635548B2 - - Google Patents
Info
- Publication number
- JPS635548B2 JPS635548B2 JP4684383A JP4684383A JPS635548B2 JP S635548 B2 JPS635548 B2 JP S635548B2 JP 4684383 A JP4684383 A JP 4684383A JP 4684383 A JP4684383 A JP 4684383A JP S635548 B2 JPS635548 B2 JP S635548B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- powder
- chip
- alloy
- bit
- 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 41
- 239000000956 alloy Substances 0.000 claims description 41
- 239000000843 powder Substances 0.000 claims description 27
- 239000011159 matrix material Substances 0.000 claims description 22
- 238000005553 drilling Methods 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 238000005245 sintering Methods 0.000 claims description 2
- 239000011230 binding agent Substances 0.000 description 7
- 239000010410 layer Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000009412 basement excavation Methods 0.000 description 5
- 239000011812 mixed powder Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 150000001247 metal acetylides Chemical class 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- -1 alloys) Chemical class 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 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
- 238000010008 shearing Methods 0.000 description 2
- 229910003470 tongbaite Inorganic materials 0.000 description 2
- 229910052721 tungsten Inorganic materials 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
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 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
- 229910003178 Mo2C 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
- 229910009001 W2C Inorganic materials 0.000 description 1
- 229910009043 WC-Co 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
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 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
- 239000000463 material Substances 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
- 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
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、前記マトリツクス合金表面の超硬チツプ周囲
に、硬質層で被装されていない非被硬装帯を設け
たことを特徴とする掘削用ビツト、
である。 That is, the first invention provides a drilling bit in which a cemented 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. A drilling bit characterized in that a non-hardened band that is not covered with a hard layer is provided around the tip.
また第２の発明は、
モールド中に超硬チツプを配置する第１の工程
と、モールド内面に該超硬チツプ周囲を除いて硬
質層形成用スケルトン粉末を貼着する第２の工程
と、モールド中にマトリツクス合金形成用スケル
トン粉末を充填する第３の工程と、モールド内の
粉末粒子間隙に金属溶湯を浸透せしめて焼結させ
る第４の工程と、を有することを特徴とする掘削
用ビツトの製造方法、
である。 The second invention also includes a first step of arranging a carbide chip in a mold, a second step of attaching a skeleton powder for forming a hard layer to the inner surface of the mold except around the carbide chip, and a second step of arranging a carbide chip in a mold. A drilling bit characterized by comprising a third step of filling the mold with skeleton powder for forming a matrix alloy, and a fourth step of infiltrating molten metal into the gaps between powder particles in the mold and sintering it. The manufacturing method is as follows.
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の周囲に表面硬装部（硬質層）が被装さ
れていない非被硬装帯１６が形成されている。こ
のような非被硬帯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図の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
リツクス合金から反作用としてチツプに対して反
力が加えられる。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１４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 non-hardened band 16 is formed around the carbide chip 10 and is not coated with a surface hardened portion (hard layer). Providing such a non-hardened band 16 reduces the shearing force acting on the chip and eliminates chipping. The reason for this is inferred as follows. That is, when a lateral load M is applied to the chip as shown in FIG. 3, a reaction force is applied to the chip 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 portion 12 and the hard surface portion 14 contract, and this contraction causes the cemented carbide chip 10 to be strongly tightened and held. Since the hardness of the hard surface portion 14 is higher than the hardness of the matrix alloy 12, when a load M (see FIG. 3) is applied to the carbide chip 10,
The reaction force F in the hard surface portion 14 becomes large, which causes a large shearing force at the tip of the chip 10, and if this exceeds a predetermined limit, the chip will break and break.
しかるに、本発明の如くチツプ周囲に表面硬装
部のない非被硬装帯１６を設け、チツプ周囲をす
べてマトリツクス合金部１２で包むようにする
と、このマトリツクス合金部１２の硬度は表面硬
装部１４の硬度よりも低いところから、チツプ１
０に対して横方向荷重Ｍが作用した際の表層部に
おける反力Ｆはそれ程大きなものとはならず、従
つてチツプ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 a non-hardened band 16 without a hard surface portion is provided around the chip as in the present invention, and the chip is completely surrounded by the matrix alloy portion 12, the hardness of the matrix alloy portion 12 will be equal to that of the hard surface portion 14. Chip 1 from a point lower than the hardness of
When a lateral load M is applied to the chip, the reaction force F on the surface layer is not so large, and therefore the shear force generated on the chip is also small, preventing chipping. .
このような非被硬装帯１６の幅ｔについては、
本発明者らが鋭意研究を重ねた結果、チツプの直
径ｄに対して、ｔ／ｄ×100（％）値が７〜25％程
度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／ｄ×100（％）値が
７〜25％、とりわけ10〜20％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。 Regarding the width t of such a non-hardened band 16,
As a result of extensive research by the present inventors, it has been found that it is suitable for the t/d×100(%) value to be approximately 7 to 25% of the chip diameter d. FIG. 4 is a graph showing an example of the results of this research, and is an example of the bending strength measured 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/d×100 (%) value is 7 to 25%, especially 10 to 20%.
このような第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
５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。しかる後、湯道２６より溶
湯を注入するのである。なお、スケルトン粉末２
２は、チツプ１０の周囲部分を残して貼着する。 Such a bit according to the first invention can be manufactured according to the method according to the second invention. FIG. 5 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 chip 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. After that, molten metal is injected from the runner 26. In addition, skeleton powder 2
2, the chip 10 is pasted leaving the surrounding area intact.
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、Mo2C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, W2C , Cr3C2 , Mo2C , 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・金属複炭化物（ダブルカーバイト）、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、Mo2C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/metal double carbides (double carbide), and combinations of these can be used as skeleton powders for matrix alloy formation. You may also add it. For example, Fe, Ni, Co, W, carbon steel, stainless steel, Fe/Mn alloy, WC, W2C , Cr3C2 , TaC,
TiC, VC, NbC, Mo 2 C, 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.
なお、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。 In the present invention, the shape, material, size, etc. of the carbide tip are not limited, and various shapes such as a button shape, a conical shape, and a chisel shape can be employed.
実施例 １
第５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。即ち、モールド１８内に超硬
チツプ１０（直径ｄ＝12mm）（材質WC−Co系超
硬合金）を配置した。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、これを超硬チツプ１０の周囲部分
以外のモールド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. That is, a cemented carbide chip 10 (diameter d=12 mm) (made of WC-Co based cemented carbide) was placed in a mold 18. Next, W powder (particle size: 325 mesh or more, 200
50 parts by weight (less than mesh) and WC powder (particle size: 300
A mixed powder containing 50 parts by weight of 50 parts by weight of 150 or more meshes was used, and this was adhered to the inner wall surface 20 of the mold 18 except for the surrounding area of the carbide chip 10. 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。 Next, Fe powder (particle size: 100 mesh or less) was used as the skeleton powder for forming the matrix alloy part.
85 parts by weight and Ni powder (particle size: 200 mesh or less) 15
The mixed powder with parts by weight was charged into the mold 18.
しかる後、バインダー合金の溶湯を湯道２６か
らモールド１８内に流し込み凝固させた。バイン
ダー合金の組成は、Mn25wt％、Ni15wt％、
Cu60wt％である。 Thereafter, the molten binder alloy was poured into the mold 18 from the runner 26 and solidified. The composition of the binder alloy is Mn25wt%, Ni15wt%,
Cu is 60wt%.
このようにして製造されたビツトについて、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。超硬チツ
プ１０周囲の非被装帯１６の幅が種々変更される
ように、表面硬装部形成用スケルトン粉末のチツ
プ１０周囲のモールド内壁面２０への非貼着部分
の面積を変えて、繰り返し試験した。 Regarding the bit manufactured in this way, a load M as shown in FIG. 3 is applied to the carbide tip 10,
The bending strength up to the point of failure was measured. In order to vary the width of the uncoated band 16 around the carbide chip 10, the area of the non-adhered portion of the skeleton powder for forming the surface hardening part to the mold inner wall surface 20 around the chip 10 is changed, Tested repeatedly.
その結果、第４図に示す結果が得られた。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。 As a result, the results shown in FIG. 4 were obtained. The hardness (H R B) of the matrix alloy part is 88.4,
The hardness (H R C) of the surface hardening part 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（７ 5/8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６図に示す。なおビツト回転数
は50R.P.M.、送水は清水を用い、800／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 (7 5/8 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 Figure 6. The bit rotation speed was 50 R.PM, and fresh water was used for water supply, with a water flow rate of 800/min. The rocks are Kofu andesite and Enzan granite.
比較例として従来品トリコーンビツト（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６図に示す。第６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 tricone bit (configured as shown in FIG. 1). The results are also shown in FIG. From FIG. 6, 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
図は非被硬装帯の幅員とチツプ曲げ強度との関係
を示すグラフ、第５図は本発明の製造方法を示す
モールド断面図、第６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……非
被装帯、１８……モールド。
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 non-hardened belt and the chip bending strength, Figure 5 is a cross-sectional view of a mold showing the manufacturing method of the present invention, and Figure 6 is a graph showing the relationship between bit load and excavation speed. It is. 10...Carbide chip, 12...Matrix alloy, 14...Hard surface portion (hard layer), 16...Non-covered band, 18...Mold.
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、前記マトリツクス合金表面の超硬チツプ周
囲に、硬質層で被装されていない非被硬装帯を設
けたことを特徴とする掘削用ビツト。 ２ モールド中に超硬チツプを配置する第１の工
程と、モールド内面に該超硬チツプ周囲を除いて
硬質層形成用スケルトン粉末を貼着する第２の工
程と、モールド中にマトリツクス合金形成用スケ
ルトン粉末を充填する第３の工程と、モールド内
の粉末粒子間隙に金属溶湯を浸透せしめて焼結さ
せる第４の工程と、を有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 chip is embedded in a matrix alloy constituting the bit body, and the surface of the matrix alloy is coated with a hard layer. A drilling bit characterized in that a non-hardened band that is not covered with a hard layer is provided around the tip. 2. A first step of arranging a carbide chip in a mold, a second step of attaching a skeleton powder for forming a hard layer to the inner surface of the mold except around the carbide chip, and a step of affixing a skeleton powder for forming a matrix alloy during the mold. A method for producing a drilling bit, comprising a third step of filling skeleton powder, and a fourth step of infiltrating molten metal into gaps between powder particles in a mold and sintering it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4684383A JPS59173478A (en) | 1983-03-18 | 1983-03-18 | Bit for excavation and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4684383A JPS59173478A (en) | 1983-03-18 | 1983-03-18 | Bit for excavation and manufacture thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59173478A JPS59173478A (en) | 1984-10-01 |
| JPS635548B2 true JPS635548B2 (en) | 1988-02-04 |
Family
ID=12758619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4684383A Granted JPS59173478A (en) | 1983-03-18 | 1983-03-18 | Bit for excavation and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59173478A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6323507Y2 (en) * | 1985-12-21 | 1988-06-28 |
-
1983
- 1983-03-18 JP JP4684383A patent/JPS59173478A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59173478A (en) | 1984-10-01 |
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