JPH034012A - Wear resistant bolt and its manufacture - Google Patents
Wear resistant bolt and its manufactureInfo
- Publication number
- JPH034012A JPH034012A JP13685389A JP13685389A JPH034012A JP H034012 A JPH034012 A JP H034012A JP 13685389 A JP13685389 A JP 13685389A JP 13685389 A JP13685389 A JP 13685389A JP H034012 A JPH034012 A JP H034012A
- Authority
- JP
- Japan
- Prior art keywords
- bolt
- cast iron
- wear
- carbide alloy
- pieces
- 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.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 229910001037 White iron Inorganic materials 0.000 claims abstract description 18
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 18
- 239000000956 alloy Substances 0.000 claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 5
- 239000010959 steel Substances 0.000 claims abstract description 5
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 4
- 230000001186 cumulative effect Effects 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 7
- 238000005266 casting Methods 0.000 abstract description 4
- 239000000155 melt Substances 0.000 abstract 2
- 238000013329 compounding Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 10
- 239000002245 particle Substances 0.000 description 8
- 229910001018 Cast iron Inorganic materials 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910001347 Stellite Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- AHICWQREWHDHHF-UHFFFAOYSA-N chromium;cobalt;iron;manganese;methane;molybdenum;nickel;silicon;tungsten Chemical compound C.[Si].[Cr].[Mn].[Fe].[Co].[Ni].[Mo].[W] AHICWQREWHDHHF-UHFFFAOYSA-N 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000005552 hardfacing Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Earth Drilling (AREA)
Abstract
Description
【発明の詳細な説明】
[産業上の利用分野]
本願発明は装置における耐摩耗部材、例えば粉砕機にお
ける原材料投入のシュートを内張するライナを取付ける
のに必要な取付ボルトに係る。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a mounting bolt necessary for attaching a wear-resistant member in an apparatus, such as a liner lining a raw material input chute in a crusher.
[従来の技術]
先に例示したようなシュートライナは耐摩耗性の材料、
例えば25%Cr鋳鉄などで製作して苛酷な使用条件下
においてもできるだけ長期間使用するように図っている
。[Prior art] The chute liner as exemplified above is made of wear-resistant material,
For example, it is made of 25% Cr cast iron to ensure that it can be used for as long as possible even under severe usage conditions.
ところで、ライナなどの部材を本体に取付けるためには
ボルト、ナツトで螺着するのが一般的であり、耐摩耗性
の高い材料は一般に溶接性が悪いのでほとんど適用の余
地がない。Incidentally, in order to attach members such as a liner to the main body, bolts and nuts are generally used, and since materials with high wear resistance generally have poor weldability, there is little room for application.
しかしこのような取付は方では、ライナに比べてボルト
の部分が際立って耐摩耗性が落ちるため、集中的にここ
から摩耗が急速に進行して折角耐摩耗性ライナを使用し
ながらその耐用期間は期待を裏切った短いものになるこ
とが多い。However, in this type of installation, the bolts are noticeably less wear-resistant than the liner, so wear accelerates intensively from here, and even if a wear-resistant liner is used, its service life may be shortened. is often short and does not meet expectations.
これを改善するために摩耗面に露出するボルトの頭部を
強化しようとする技術は従来から開発されてきた。In order to improve this problem, techniques have been developed to strengthen the bolt heads that are exposed to wear surfaces.
例えば、SN0M材などの合金鋼でボルトを製作し、そ
の後頭部のみを高周波焼入して硬度を向上したもの、頭
部のみに耐摩耗性材料(例えばステライト)を硬化肉盛
するもの、または頭部のみを耐摩耗材料(例えば25%
Cr鋳鉄)の鋳包みとするものなどがあり、現に各装置
において実地に使用されている。For example, bolts are manufactured from alloy steel such as SN0M material, and only the head part is induction hardened to improve hardness, or only the head part is hardened with a wear-resistant material (such as stellite), or Only the parts are covered with wear-resistant material (e.g. 25%
There are some that are cast-ins of Cr cast iron), and are actually used in various types of equipment.
[発明が解決しようとする課題]
先に例示した耐摩耗ボルトはそれ以前に使用されてきた
通常ボルトに比べると、それぞれ使用期間が延長され、
ある程度は初期の目的を達したかに見えるが、なお絶え
間なく進歩する技術によって取付けるべぎライナ自体の
耐摩耗性が限りなく改善されている今日、必ずしも使用
者の満足を(りているとは言えなくなった。[Problems to be Solved by the Invention] The wear-resistant bolts illustrated above have longer service periods than the conventional bolts that have been used before.
Although it seems that the initial objective has been achieved to some extent, it is still difficult to say that the wear resistance of the attached liner itself has been infinitely improved due to constantly advancing technology. I can't say it anymore.
高周波焼入した合金鋼では明らかに求められる耐摩耗性
を叶えることは難しくなり、硬化肉盛は取付後の内需溶
接によって熱応力が生じてυ]れる恐れがあり、現地に
おいて取付後の溶接施工が困難な場合も間々ある。It is clearly difficult to achieve the required wear resistance with induction hardened alloy steel, and there is a risk that hardfacing will cause thermal stress due to domestic welding after installation, resulting in welding work performed on site after installation. There are times when this is difficult.
高Cr鋳鉄など頭部の鋳包み製造方式も、ライナが高C
r鋳鉄以上のざらに高い耐摩耗性を記録するような材質
に置き換えられてくると両者の不整合が目立ちはじめ、
新しい課題を生じることになる。The cast-in manufacturing method for the head, such as high Cr cast iron, also has a high C liner.
When materials were replaced with materials that had a much higher wear resistance than cast iron, the inconsistency between the two began to become noticeable.
This will create new challenges.
本願発明は以上に述べた新しい課題を解決するために、
従来の取付ポル1〜を数段凌駕する新しい耐摩耗ボルト
の提供を目的とする。In order to solve the above-mentioned new problems, the present invention has the following features:
The purpose is to provide a new wear-resistant bolt that is several steps superior to the conventional mounting bolts 1 to 1.
[課題を解決するだめの手段]
本願発明に係る耐摩耗ボルトは、焼結炭化物合金の細片
を累積結合した層とこの後背を支保する白鋳鉄層とが一
体的に複合した頭部よりなることによって前記の課題を
解決した。[Means for Solving the Problems] The wear-resistant bolt according to the present invention has a head made of an integral composite layer of cumulatively bonded pieces of sintered carbide alloy and a white cast iron layer supporting the back of the layer. This solved the above problem.
またこの耐摩耗ボルトの製造方法としては、ボルト頭部
を形成する下鋳型の底面に焼結炭化物合金の細片を累積
して載置し、−ト鋳型内には縦向きにIiI鉄ボルトを
埋設してその先端を前記下鋳型の中空部内へ突出し、両
鋳型を合せて白鋳鉄成分の溶湯を鋳込み、溶湯とボルト
先端および溶湯と焼結炭化物合金累積層とをぞれぞれ一
体的に溶着J−ることを提示する。In addition, the manufacturing method for this wear-resistant bolt is to stack small pieces of sintered carbide alloy on the bottom of a lower mold that forms the bolt head, and place IIII iron bolts vertically in the lower mold. The molten metal and the bolt tip and the molten metal and the sintered carbide alloy cumulative layer are each integrally embedded by embedding the bolt and protruding its tip into the hollow part of the lower mold, and casting the molten metal of white cast iron component together with both molds. Welding J- is proposed.
[作用]
焼結炭化物合金の細片がある厚さだけ累積し、しかもそ
れらが相nに緊密に結合して摩耗に直面しており、これ
を白鋳鉄で後背から一体的に支えている。従って、前記
細片は表面を擦過する通過材料によって剥離することな
く、持ち前の超耐摩耗性を遺怒なく発揮し続けてその耐
用期間を!8段に延長する作用を果1゜
一方、このような耐摩耗ボルトを製作する方法について
言えば、下鋳型の底面に累積して載nシ5だ焼結炭化物
合金の細片の上に白鋳鉄成分の?8湖が鋳込まれると、
細片と細片の間隙を浸透して溶湯が潜入し、その後凝固
して細片同士を緊密に結合すると共にその後背を強固に
支保する。さらに上鋳型から突出した鋼鉄ボルトの先端
を鋳包むからこれとも一体的に溶着し、結局鋼鉄ボルト
、白鋳鉄、焼結炭化物合金層の三者が一体的に複合し、
すぐれた耐摩耗ボルトを比較的経演的【こ製造リ−るこ
とができる。[Function] Sintered carbide alloy strips accumulate to a certain thickness, and moreover, they are tightly bonded to phase n, facing wear, and are integrally supported from behind by white cast iron. Therefore, the strips will not be peeled off by the passing material that scrapes the surface, and will continue to exhibit their inherent super wear resistance without regret, extending their useful life! On the other hand, as for the method of manufacturing such a wear-resistant bolt, it is said that white powder is deposited on the bottom of the lower mold on top of the sintered carbide alloy strips. Of cast iron components? When the 8 lakes are cast,
The molten metal infiltrates the gaps between the pieces and then solidifies, tightly joining the pieces together and firmly supporting the back of the pieces. Furthermore, since the tips of the steel bolts protruding from the upper mold are cast, they are also welded together, and in the end, the steel bolts, white cast iron, and sintered carbide alloy layer are combined into one.
Excellent wear-resistant bolts can be produced relatively empirically.
[実施例]
前記耐摩耗ボルトおよびその製造方法において最も望ま
しいと考える実施例を披露する。[Example] An example considered to be the most desirable of the wear-resistant bolt and its manufacturing method will be shown.
投合する白鋳鉄の成分として最も好ましい範囲は、C量
を2.5%〜4.0%の間においてCr /’ Cの比
率を1〜12の範囲に入ることを推奨でさる。The most preferable range for the components of the white cast iron to be mixed is that the amount of C is between 2.5% and 4.0%, and the ratio of Cr/'C is within the range of 1 to 12.
比率が1に満たないときは複合炭化物の形成が少なきに
失し、マトリックス硬度が低く黒鉛の晶出を生じる。ま
たこの比率が12を越えるとぎは炭化物形成のためのC
が不足し焼結炭化物合金よりCを奪い両者の界面に脆化
相を形成覆る。When the ratio is less than 1, the formation of composite carbides is slightly lost, the matrix hardness is low, and graphite crystallization occurs. Moreover, when this ratio exceeds 12, C is used for carbide formation.
When carbon is insufficient, C is taken away from the sintered carbide alloy, forming a brittle phase at the interface between the two.
また、焼結炭化物合金粒子間に形成される狭い空隙に白
鋳鉄溶湯が完全に浸透するためには、注湯温度は粒子層
の厚さTcmに対し白鋳鉄の凝固点より少なくとも50
T’C以上である必要がある。In addition, in order for the white cast iron molten metal to completely penetrate into the narrow gaps formed between the sintered carbide alloy particles, the pouring temperature must be at least 50° below the freezing point of the white cast iron with respect to the particle layer thickness Tcm.
It needs to be equal to or higher than T'C.
また過度の焼結炭化物合金の白鋳鉄への)8Mを避ける
ために、注湯温度は白鋳鉄の凝固点より180 (1,
75+T>’Cの範囲でなければならない。In addition, in order to avoid excessive sintered carbide alloy into white cast iron), the pouring temperature is 180 (1,
It must be in the range 75+T>'C.
粒子の性状については粒径が小さすぎると焼結炭化物合
金間隔が小ざくなりずぎ、鋳込湿度を上げても粒子間に
白鋳鉄が充分に浸透しない。また温度を上げすぎると焼
結炭化物合金の白鋳鉄中への溶a間が著しく増大する。Regarding the properties of the particles, if the particle size is too small, the spacing between the sintered carbide alloys becomes small, and even if the casting humidity is increased, the white cast iron will not penetrate sufficiently between the particles. Moreover, if the temperature is raised too much, the amount of melt a of the sintered carbide alloy into the white cast iron increases significantly.
粒径が粗大にすぎると焼結炭化物合金の体積率が低下す
るばかりでなく、粒子間白鋳鉄母材のアブレーシブ粒子
により切削される平均自由工程が大きくなり耐摩耗性は
劣化する。従って2mm〜15mm粒子が全体の70%
以上となる構成が最適である。If the particle size is too coarse, not only will the volume fraction of the sintered carbide alloy decrease, but also the mean free path cut by the abrasive particles of the interparticle white cast iron base material will increase, resulting in deterioration of wear resistance. Therefore, 70% of the total particles are 2mm to 15mm.
The above configuration is optimal.
一方、鋳包まれるwI製ボルトとしては扱は難いように
凹溝を刻設しておくことが望ましい。On the other hand, it is desirable to carve a concave groove so that it is difficult to handle the wI bolt, which is to be cast.
第1図は最も典型的な実施例を図示する断面図であり、
焼結炭化物合金層1の後背を白鋳鉄部2で支保し、この
白鋳鉄部内へボルト3を鋳包んでいるが、この際、後は
止めの凹溝4が両者の係合をより強めるという特有の作
用も発現する。FIG. 1 is a cross-sectional view illustrating the most typical embodiment;
The back of the sintered carbide alloy layer 1 is supported by a white cast iron part 2, and a bolt 3 is cast into this white cast iron part, but at this time, the groove 4 for the stopper is said to further strengthen the engagement between the two. It also exhibits unique effects.
U発明の効果]
本願発明は以上に述べた構成と作用を有するから、実際
の装置に適用すると耐用限度を大幅に延伸する。この効
果を実施例の試用結果によって例示する。構成は第1図
に示すものに統一し、比較例も全く同一形状の従来品を
同一条件で並べて使用している。Effects of the Invention] Since the present invention has the configuration and operation described above, when applied to an actual device, the service life is greatly extended. This effect will be illustrated by the trial results of Examples. The configuration is unified to that shown in FIG. 1, and the comparative example also uses conventional products of exactly the same shape side by side under the same conditions.
比較例1は頭部を高周波焼入したSNCMのボルト、比
較例2は25%Cr鋳鉄を鋳包んだボルト。Comparative Example 1 is an SNCM bolt whose head is induction hardened, and Comparative Example 2 is a bolt made of 25% Cr cast iron.
本願実施例はタングステンカーバイドのコバルトによる
焼結体で約10mmの厚さの層を累積結合し、 2.9
%C−31%(Cr+W+V) −1,5(N i 十
Mo)を母材とした白鋳鉄と複合化したものである。使
用箇所は製鉄所における鉄鉱石投入ホッパライナの取付
ボルトであり、使用日数は第1表のとおりである。In the present embodiment, layers of approximately 10 mm thick are cumulatively bonded using a sintered body of tungsten carbide and cobalt. 2.9
%C-31%(Cr+W+V)-1,5(Ni 10Mo) is a composite material with white cast iron as a base material. The parts used are the mounting bolts of iron ore input hopper liners in steel plants, and the number of days of use is shown in Table 1.
第1表Table 1
第1図は本願実施例の正面断面図。 FIG. 1 is a front sectional view of the embodiment of the present application.
Claims (2)
背を支保する白鋳鉄層とが一体的に複合した頭部よりな
ることを特徴とする耐摩耗ボルト。(1) A wear-resistant bolt characterized by having a head made up of an integrally composite layer of cumulatively bonded pieces of sintered carbide alloy and a white cast iron layer supporting the rear of the layer.
合金の細片を累積して載置し、上鋳型内には縦向きに鋼
鉄ボルトを埋設してその先端を前記下鋳型の中空部内へ
突出し、両鋳型を合せて白鋳鉄成分の溶湯を鋳込み、溶
湯とボルト先端および溶湯と焼結炭化物合金累積層とを
それぞれ一体的に溶着した耐摩耗ボルトの製造方法。(2) Sintered carbide alloy strips are accumulated and placed on the bottom of the lower mold that forms the bolt head, and a steel bolt is buried vertically in the upper mold and its tip is inserted into the lower mold. A method for producing a wear-resistant bolt that protrudes into a hollow part, aligns both molds, and pours a molten metal of white cast iron component, and integrally welds the molten metal to the bolt tip and the molten metal to a sintered carbide alloy cumulative layer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13685389A JPH034012A (en) | 1989-05-29 | 1989-05-29 | Wear resistant bolt and its manufacture |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13685389A JPH034012A (en) | 1989-05-29 | 1989-05-29 | Wear resistant bolt and its manufacture |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH034012A true JPH034012A (en) | 1991-01-10 |
Family
ID=15185041
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13685389A Pending JPH034012A (en) | 1989-05-29 | 1989-05-29 | Wear resistant bolt and its manufacture |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH034012A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4960084A (en) * | 1988-09-30 | 1990-10-02 | Nissan Motor Co., Ltd. | Valve timing control system for internal combustion engine |
JP2014237166A (en) * | 2013-06-10 | 2014-12-18 | 株式会社栗本鐵工所 | Composite abrasion resistant member |
-
1989
- 1989-05-29 JP JP13685389A patent/JPH034012A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4960084A (en) * | 1988-09-30 | 1990-10-02 | Nissan Motor Co., Ltd. | Valve timing control system for internal combustion engine |
JP2014237166A (en) * | 2013-06-10 | 2014-12-18 | 株式会社栗本鐵工所 | Composite abrasion resistant member |
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