JPH04189470A - Steel shot grain and manufacture thereof - Google Patents
Steel shot grain and manufacture thereofInfo
- Publication number
- JPH04189470A JPH04189470A JP31626990A JP31626990A JPH04189470A JP H04189470 A JPH04189470 A JP H04189470A JP 31626990 A JP31626990 A JP 31626990A JP 31626990 A JP31626990 A JP 31626990A JP H04189470 A JPH04189470 A JP H04189470A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- shot
- grains
- hardness
- shot grains
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 61
- 239000010959 steel Substances 0.000 title claims abstract description 61
- 238000004519 manufacturing process Methods 0.000 title claims description 17
- 239000000463 material Substances 0.000 claims abstract description 31
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 10
- 229910000975 Carbon steel Inorganic materials 0.000 claims abstract 3
- 239000010962 carbon steel Substances 0.000 claims abstract 3
- 238000010791 quenching Methods 0.000 claims description 8
- 230000000171 quenching effect Effects 0.000 claims description 8
- 238000005496 tempering Methods 0.000 claims description 6
- 229910001208 Crucible steel Inorganic materials 0.000 description 11
- 238000005520 cutting process Methods 0.000 description 10
- 230000007547 defect Effects 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000005480 shot peening Methods 0.000 description 4
- 238000005491 wire drawing Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、鋼製ショット粒及びその製造方法に関し、詳
細には、金属製品や半製品等のパリ取り、砂落し、汚点
消去、黒皮除去、梨地肌仕上げ、残留圧縮応力付与、表
面硬化等に使用する投射用略球状微粒物（即ち、ショッ
ト粒）であって、高硬度且つ高寿命を有する鋼製ショッ
ト粒及びその製造方法に関するものである。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to steel shot granules and a method for producing the same, and in particular, it can be used to remove pars, remove sand, remove stains, and remove black spots from metal products and semi-finished products. Approximately spherical fine particles for projection (i.e., shot particles) used for removal, satin finish, imparting residual compressive stress, surface hardening, etc., and related to steel shot particles with high hardness and long life, and a method for producing the same. It is.
（従来の技術）
ショット粒は前記表面硬化等のための投射（ショットピ
ーニング）施工に繰返し使用するものであり、高寿命で
あることか望まれる。(Prior Art) Shot grains are used repeatedly in the shot peening process for surface hardening, etc., and are desired to have a long life.
又、ショット粒の硬度は、ショットピーニングされる被
ショット材の硬度と同等又はそれ以上か好ましいと考え
られるか、残留圧縮応力付与の場合等は高硬度のものは
と良い。近年、材料の高強度化の進歩か著しくて被ショ
ット材も、年々高硬度化しており、それに伴いショット
粒の高硬度化か必要となってきた。Further, it is considered preferable that the hardness of the shot grains be equal to or higher than the hardness of the shot material to be shot peened, and in the case of imparting residual compressive stress, it is preferable that the shot grains have a hardness of high hardness. In recent years, there has been remarkable progress in increasing the strength of materials, and shot materials are becoming harder and harder year by year, and as a result, it has become necessary to increase the hardness of shot grains.
従来、ショット粒には鋳鋼製２３７５粒と鋼線製ショッ
ト粒とかあり、下記の如く製造される。Conventionally, shot grains include cast steel 2375 grains and steel wire shot grains, which are manufactured as follows.
鋳鋼製ショット粒は、アトマイズ造粒法により鋳鋼粒を
得、これをふるい選別した後、焼入れ、焼戻し処理して
製造される。該ショット粒は球状であり、鋳鋼のＣ量は
通常０．６〜１．２ｗｔ％である。Cast steel shot grains are produced by obtaining cast steel grains by an atomizing granulation method, screening the grains through a sieve, and then quenching and tempering them. The shot grains are spherical, and the C content of the cast steel is usually 0.6 to 1.2 wt%.
鋼線製ショット粒は、通常Ｃ：０．５〜０．８ｗｔ％の
硬鋼線材を穴ダイスて伸線してショット粒径と略同等径
の鋼線を得、これを刃物て略ショット粒径に相当する長
さに切断して製造される。該ショット粒は、第１図に示
す如く円柱形であり、切断により生じた角（３）か存る
。尚、第１図で（１）は鋼線製ショット粒、（２）は刃
物切断面を示すものである。Shot grains made of steel wire are usually made by drawing a hard steel wire rod with a C content of 0.5 to 0.8 wt% using a hole die to obtain a steel wire with a diameter approximately equivalent to the shot grain size, and then using a cutting tool to form the steel wire into approximately shot grains. Manufactured by cutting into lengths corresponding to the diameter. The shot grains have a cylindrical shape as shown in FIG. 1, and there are corners (3) formed by cutting. In FIG. 1, (1) shows the steel wire shot grain, and (2) shows the cutting surface of the blade.
該角（３）有りのショット粒は、被ンヨット材表面を粗
らすのて、粗らすことなくショットピーニング施工する
場合には適していない。そこて、前記切断後、更に角取
り処理される場合か多い（発明か解決しようとする課題
）
ところか、前記従来の鋳鋼製ショット粒及び鋼線製ショ
ット粒には、下記の如く一長一短かあって、寿命又は硬
度のいづれかが低く、不充分であるという問題点かある
。The shot grains with the angle (3) roughen the surface of the yacht material, but are not suitable for shot peening without roughening. Therefore, after the cutting, the chamfering process is often performed (this is a problem to be solved by the invention). However, the conventional cast steel shot grains and steel wire shot grains have advantages and disadvantages as described below. However, there is a problem that either the life or the hardness is low and insufficient.
即ち、従来の鋳鋼製ショット粒においては、鋳鋼中Ｃ量
の増大に伴って硬度か高くなるか、鋳造組織に起因して
鋳鋼中のボイド（空洞）等の内部欠陥か多くなるために
寿命か低下する。この寿命低下は、第２図に示す如く、
硬度かビッカース硬度（ＨＶ）て略５００以上て著しく
、急激に低下する。In other words, in conventional cast steel shot grains, the hardness increases as the amount of C in the cast steel increases, or the lifetime decreases due to the increase in internal defects such as voids in the cast steel due to the cast structure. descend. As shown in Figure 2, this decrease in lifespan is caused by
The hardness (Vickers hardness) of approximately 500 or more decreases rapidly.
従って、ＨＶ ： ５００程度以下の低硬度ものしか実
用的に使用し得す、ＨＶ：５００以上のものては極く低
寿命て経済性に乏しいという欠点かある。尚、粒径か小
さくなるに伴って上記鋳鋼中の内部欠陥か減少して寿命
か向上し、Ｈｖ：略５００以上のものでも粒径 ０．２
ｍｍ１下であれば比較的寿命か長くなる。Therefore, only those with a low hardness of about HV: 500 or less can be practically used, and those with an HV of 500 or more have the disadvantage of extremely short life and poor economic efficiency. In addition, as the grain size becomes smaller, the internal defects in the above-mentioned cast steel decrease and the lifespan increases, and even for Hv: approximately 500 or more, the grain size is 0.2.
If it is less than mm1, the life will be relatively long.
従来の鋼線製ショット粒においては、伸線組織であるた
め鋳鋼製ショット粒に比して内部欠陥か少なくて寿命に
優れている。しかし、鋼線を刃物で切断する必要かある
ので、鋼線の硬度かＨＶて略６００以下に制約され、そ
の結果ショット粒の硬度が低い（ＨＶ ： ６００程度
以下）という欠点かある。Conventional steel wire shot grains have a wire-drawn structure, so they have fewer internal defects and have a longer lifespan than cast steel shot grains. However, since it is necessary to cut the steel wire with a knife, the hardness of the steel wire is limited to approximately 600 or less in HV, and as a result, the hardness of the shot grains is low (HV: approximately 600 or less).
本発明は、このような事情に着目してなされたものであ
って、その目的は前記問題点を解消し、硬度かＨＶで６
００以上と高く、且つ高寿命を有する直径０．３ｍｍ以
″上の鋼製ショット粒及びその製造方法を提供しようと
するものである。The present invention has been made in view of these circumstances, and its purpose is to solve the above problems and to improve the hardness to 6 in terms of HV.
The object of the present invention is to provide steel shot grains with a diameter of 0.3 mm or more, which have a high lifespan of 0.00 or more, and a method for producing the same.
（課題を解決するための手段）
上記目的を達成するために、本発明に係る鋼製ショット
粒及びその製造方法は、次のような構成としている。(Means for Solving the Problems) In order to achieve the above object, the steel shot grains and the method for manufacturing the same according to the present invention have the following configuration.
即ち、請求項１に記載の鋼製ショット粒は、ＣＯ，４ｗ
ｔ％以上を含有すると共に熱間加工された鋼製線材を素
材にしてなる直径・０．３ｍｍ以上の鋼製ショット粒て
あって、核粒の組織か焼戻しマルテンサイト組織である
とともにビッカース硬度か６００以上であることを特徴
とする鋼製ショット粒である。That is, the steel shot grains according to claim 1 contain CO,4w
Steel shot grains with a diameter of 0.3 mm or more are made from hot-worked steel wire rods that contain t% or more, and have a core grain structure or tempered martensitic structure and Vickers hardness. It is a steel shot grain characterized by having a grain size of 600 or more.
請求項２に記載の鋼製ショット・粒の製造方法は、Ｃ：
０．４ｗｔ％以上を含有する鋼片を熱間加工して線材
と成し、該線材を伸線し、刃物で切断して小片材と成し
、次いで該小片材を角取り処理した後１焼入れ処理し、
焼戻し処理することを特徴とする鋼製ショット粒の製造
方法である。The method for producing steel shot/granules according to claim 2 includes C:
A steel piece containing 0.4 wt% or more was hot-processed to form a wire rod, the wire rod was drawn, and cut with a knife to form a small piece material, and then the small piece material was subjected to cornering treatment. After 1 quenching treatment,
This is a method for producing steel shot grains, which is characterized by subjecting them to a tempering treatment.
請求項３に記載の鋼製ショット粒の製造方法は、Ｃ：
０．４ｗｔ％以上を含有する鋼を熱間加工して線材と成
し、該線材を伸線し、次いで溶断して小片材と成すと共
に焼入れし、次いで焼戻し処理することを特徴とする鋼
製ショット粒の製造方法である。The method for producing steel shot grains according to claim 3 includes C:
Steel containing 0.4 wt% or more is hot-worked to form a wire rod, the wire rod is drawn, then melt-cut to form small pieces, quenched, and then tempered. This is a method for producing shot granules.
（作 用）
本発明に係る鋼製ショット粒は、前記の如く、Ｃ・Ｏ’
、４ｗｔ％以上を含有すると共に熱間加工された鋼製線
材を素材にしてなる直径：０．３ｍｍ以上の鋼製ショッ
ト粒であるのて、上記熱間加工に起因して金属組織的に
緻密であってボイド等の内部欠陥か極めて少なく、その
ため寿命に優れている。又、粒の鋼組織を焼戻しマルテ
ンサイト組織にすると共にビッカース硬度を６００以上
にしている。従って、硬度かＨＶて６００以上と高く、
且つ高寿命を有する直径：０．３ｍｍ以上の鋼製ショッ
ト粒である。上記鋼製線材のＣ量を０．４ｗｔ％以上に
しているのは、Ｃは硬度向上に存効な元素であって０．
４ｗｔ％未満にするとＨＶ ： ６００以上の確保か難
しくなるからである。(Function) As mentioned above, the steel shot grains according to the present invention have C.O'
, 4wt% or more and is made from hot-worked steel wire material and has a diameter of 0.3mm or more, so it has a dense metallographic structure due to the hot working. It has extremely few internal defects such as voids, and therefore has an excellent lifespan. Further, the steel structure of the grains is made into a tempered martensitic structure, and the Vickers hardness is set to 600 or more. Therefore, the hardness or HV is high, over 600.
Moreover, the steel shot grains have a diameter of 0.3 mm or more and have a long life. The reason why the C content of the steel wire rod is set to 0.4 wt% or more is because C is an element that is effective in improving hardness.
This is because if the content is less than 4 wt%, it becomes difficult to ensure HV: 600 or more.
本発明に係る鋼製ショット粒の製造方法の中、請求項２
に記載の製造方法は、前述の如（、先ずＣ：０．４ｗｔ
％以上を含有する鋼を熱間加工して線材と成し、該線材
を伸線するようにしているので、金属組織的に緻密であ
ってボイド等の内部欠陥か極めて少ない伸線材（鋼線）
か得られる。Claim 2 in the method for producing steel shot grains according to the present invention
The manufacturing method described in
% or more to form a wire rod, and then the wire rod is drawn. Therefore, the wire rod has a dense metallographic structure and has very few internal defects such as voids (steel wire). )
or can be obtained.
次に、該伸線材を刃物で切断して小片材と成した後、該
小片材を角取り処理するようにしているので、角の無い
円柱状のショット粒か得られる。Next, the drawn wire material is cut with a knife to form small pieces of material, and then the small pieces of material are rounded, so that cylindrical shot grains without corners are obtained.
上記角取り処理後、焼入れ処理し、焼戻し処理するよう
にしているので、焼戻しマルテンサイト組織を有する鋼
製ショット粒となる。かかる焼戻しマルテンサイト組織
は強度、靭性に富んだ組織であり、同時に鋼中Ｃ量は０
．４ｗｔ％以上であるので、ショット粒の硬度はＨＶて
６００以上となる。After the chamfering process, the steel shot grains are quenched and then tempered, resulting in steel shot grains having a tempered martensitic structure. This tempered martensitic structure is a structure rich in strength and toughness, and at the same time the C content in the steel is 0.
．． Since it is 4 wt% or more, the hardness of the shot grains is 600 or more in terms of HV.
従って、硬度かＨＶて６００以上と高く、且つ、内部欠
陥か極めて少ないため高寿命を有し、更に角の無い直径
：０．３ｍｍ以上の鋼製ショット粒を製造し得る。Therefore, it has a high hardness (HV) of 600 or more, has very few internal defects, has a long life, and can produce steel shot grains with a diameter of 0.3 mm or more without corners.
請求項３に記載の製造方法は、前述の如く、Ｃ： ０．
４ｗｔ％以上を含有する鋼を熱間加工して線材と成し、
該線材を伸線し、次いで溶断して小片材と成すと共に焼
入れし、次いで焼戻し処理するようにしているので、前
記請求項２に記載の製造方法の場合と同様に優れた鋼製
ショット粒を製造し得る。但し、伸線材の切断を刃物で
はなく溶断により行うようにしているのて、切断後の小
片材は角か無くて丸みがあり、そのため角取り処理か不
要となる。又、溶断時に焼入れ温度として充分な高温に
加熱され、溶断後半片材は急冷されるので、溶断の際に
同時に焼入れされることになり、溶断後は別途焼入れ処
理する必要がなく、焼戻し処理すればよい。従って、請
、−求項２記載の方法の場合に比して、製造工程が少な
くなるという利点かある。The manufacturing method according to claim 3, as described above, has C: 0.
Hot-processing steel containing 4 wt% or more to form a wire rod,
Since the wire rod is drawn, then melt-cut to form small pieces, quenched, and then tempered, excellent steel shot grains can be obtained as in the case of the manufacturing method according to claim 2. can be manufactured. However, since the drawn wire material is cut by fusing instead of using a knife, the small pieces of material after cutting have no corners and are rounded, so there is no need for cornering. In addition, since the material is heated to a high enough temperature for quenching at the time of fusing, and the second half of the material is rapidly cooled, it is quenched at the same time as the fusing, so there is no need for separate quenching after fusing, and there is no need for tempering. Bye. Therefore, there is an advantage that the number of manufacturing steps is reduced compared to the method described in claim 2.
尚、前記鋼は、Ｃ：０．４ｗｔ％以上を含有しているた
め焼入れ性に優れているのて、Ｃ以外の焼入れ性向上元
素、例えばＣｒ、 Ｍｎ、 Ｖ等を添加する必要はない
か、焼戻し軟化抵抗を高める元素、例えばＳｉ等を添加
すると、高温焼戻しても硬度低下が少なく、そのため硬
度が高く、且つ、より靭性が優れて高寿命を有するもの
か得られるので、そのようにすることか望ましい。Incidentally, since the above-mentioned steel has excellent hardenability because it contains C: 0.4 wt% or more, is there any need to add hardenability-improving elements other than C, such as Cr, Mn, V, etc.? If an element that increases resistance to tempering softening, such as Si, is added, the hardness decreases less even after high-temperature tempering, and therefore a product with high hardness, superior toughness, and long life can be obtained, so this is done. That is desirable.
前記熱間加工後焼入れ前に炭化物の球状化熱処理を行う
と、微細な球状炭化物か鋼のマトリックスに分散し、そ
の結果ショット粒の耐摩耗性が向 □上するのてよい。If carbide spheroidization heat treatment is performed after the hot working and before quenching, fine spheroidal carbides will be dispersed in the steel matrix, and as a result, the wear resistance of the shot grains will be improved.
又、熱間加工後伸線材の刃物切断前に炭化物球状化熱処
理を施すと、線材か軟化して刃物切断し易くなり、刃物
の寿命か延びるという利点かある。Furthermore, if a carbide spheroidization heat treatment is applied to the drawn wire material after hot working and before cutting with a knife, the wire becomes soft and becomes easier to cut with a knife, which has the advantage of extending the life of the knife.
但し、かかる炭化物球状化熱処理を施す場合は、球状化
するＣ量の分だけＣ含有量を高くする必要があり、例え
ば１ｗｔ％程度とするとよい。Ｃ含有量を１ｗｔ％にし
た場合、０．４ｗｔ％Ｃを球状化させると、残りの０．
６ｗｔ％Ｃか焼入れでマルテンサイト化に寄与すること
になり、ＨＶ ： ６００以上を充分に満足する硬度か
得られる。However, when such carbide spheroidization heat treatment is performed, the C content needs to be increased by the amount of C to be spheroidized, and is preferably set to about 1 wt%, for example. When the C content is 1 wt%, if 0.4 wt% C is spheroidized, the remaining 0.4 wt% C is spheroidized.
The 6 wt% C quenching contributes to martensite formation, and a hardness that satisfies HV: 600 or more can be obtained.
（実施例）
実施例Ｉ
Ｃ：０．４９ｗｔ％、 Ｓｉ：０．３５ｗｔ％、 Ｍｎ
：０．７ｗｔ％の鋼を熱間圧延してΦ５．５ｍｍの線材
と成し、該線材を伸線加工用穴ダイスにより伸線してΦ
０．５ｍｍの伸線材と成し、該伸線材を刃物て略０．５
ｍｍに切断して小片材と成し、該小片材を角取り処理し
、次いで、９００°Ｃに１分加熱した後油冷（焼入れ）
し、１８０°Ｃに５分加熱した後空冷（焼戻し）し、径
：Φ０．５ｍｍ、長さ：略０．５ｍｍの円柱状の鋼製シ
ョット粒を製造した。(Example) Example I C: 0.49wt%, Si: 0.35wt%, Mn
: 0.7wt% steel is hot-rolled to form a wire rod of Φ5.5mm, and the wire is drawn with a hole die for wire drawing to form a wire rod of Φ5.5mm.
It is made into a 0.5 mm wire drawing material, and the wire drawing material is cut into approximately 0.5 mm with a knife.
The material is cut into small pieces of mm, and the small pieces are subjected to chamfering treatment, then heated to 900°C for 1 minute, and then cooled in oil (quenching).
The mixture was heated to 180° C. for 5 minutes and then air cooled (tempered) to produce cylindrical steel shot grains with a diameter of Φ0.5 mm and a length of approximately 0.5 mm.
上記ショット粒は、鋼組織が焼戻しマルテンサイト組織
を呈し、硬度はＨＶ： ７００てあった。The steel structure of the shot grains was a tempered martensitic structure, and the hardness was HV: 700.
実施例２
Ｃｏｏ、９５ｗｔ％、 Ｓｉ：０．２５ｗｔ％、 Ｃｒ
：１．３５ｗｔ％の鋼を熱間圧延してΦ５．５ｍｍの線
材と成し、該線材を伸線加工用穴ダイスにより伸線して
Φ０．５ｍｍの伸線材と成し、該伸線材をレーザ光線に
より略０．５ｍｍ長さに溶断して小片材と成し、空冷後
該小片材を１８０ ’Ｃに５分加熱した後空冷し、径、
Φ０．５ｍｍ、長さ：略伝５ｍｍの円柱状の鋼製ショッ
ト粒を製造した。Example 2 Coo, 95wt%, Si: 0.25wt%, Cr
: 1.35 wt% steel is hot rolled to form a wire rod of Φ5.5 mm, the wire rod is drawn with a wire drawing hole die to form a drawn wire material of Φ0.5 mm, and the drawn wire material is A small piece of material is cut into a length of about 0.5 mm by a laser beam, and after air cooling, the small piece is heated to 180'C for 5 minutes, then air cooled, and the diameter is
Cylindrical steel shot grains with a diameter of 0.5 mm and a length of approximately 5 mm were manufactured.
上記ショット粒は、鋼組織か焼戻しマルテンサイト組織
を呈し、硬度はＨＶ１８００〜８５０てあった。The shot grains had a steel structure or a tempered martensitic structure, and had a hardness of HV1800 to 850.
尚、前記溶断、空冷後の小片材は焼入れ組織を呈し、硬
度が極めて高く、焼入れされていることか確認された。Incidentally, the small pieces of material after the melt cutting and air cooling exhibited a quenched structure and had extremely high hardness, confirming that they had been quenched.
（発明の効果）
本発明は、以上説明したような構成を有し作用を成すも
のであり、本発明に係る鋼製ショット粒は硬度がＨＶて
６００以上と高く、且つ高寿命を存する直径：０．３ｍ
ｍ以上の鋼製ショット粒てあり、従って、近年の材料の
高強度化の著しい進歩に伴う被ショット材の高硬度化に
対応し、所要のショットピーニングをし得るようになり
、又、ショットピーニング施工に繰返し使用し得て経済
性を向上し得るようになるという優れた効果を奏するも
のである。(Effects of the Invention) The present invention has the structure and functions as described above, and the steel shot grains according to the present invention have a diameter of HV hardness as high as 600 or more and a long life. 0.3m
There are steel shot grains with a diameter of more than 1.5 m, and therefore, it is possible to perform the required shot peening in response to the increasing hardness of the shot material that has accompanied the remarkable progress in increasing the strength of materials in recent years. It has the excellent effect of being able to be used repeatedly in construction and improving economic efficiency.
本発明に係る鋼製ショット粒の製造方法によれば、上記
の如き高硬度且つ高寿命を有する優れた鋼製ショット粒
を製造し得、従って、上記被ショット材の高硬度化に対
応し得ると共に経済性に優れたショットピーニングの実
現を、可能ならしめるという工業的価値の大きい効果か
得られる。According to the method for producing steel shot grains according to the present invention, excellent steel shot grains having high hardness and long life as described above can be produced, and therefore, it is possible to cope with the increase in the hardness of the shot material. At the same time, it is possible to achieve an effect of great industrial value by making it possible to realize shot peening which is excellent in economical efficiency.
第１図は従来の鋼製線ショット粒（鋼線の刃物切断て得
られたショット粒）の形状の概要を示す斜視図、第２図
は従来の鋳鋼製ショット粒の硬度（ＨＶ）と寿命との関
係を示す図である。
（１）−鋼製線シヨツト粒 （２）−刀物切断面（３）
−角
特許出願人 株式会社 神戸製鋼折
代 理 人 弁理士 全史 章−
妹 争（回）Figure 1 is a perspective view showing the outline of the shape of conventional steel wire shot grains (shot grains obtained by cutting steel wire with a knife), and Figure 2 is the hardness (HV) and lifespan of conventional cast steel shot grains. FIG. (1) - Steel wire shot grain (2) - Cutting surface of knife (3)
- Corner patent applicant: Kobe Steel Corporation, patent attorney Akira Zenfumi - Younger sister dispute (times)
Claims (3)
された鋼製線材を素材にしてなる直径：０．３ｍｍ以上
の鋼製ショット粒であって、該粒の組織が焼戻しマルテ
ンサイト組織であると共にビッカース硬度が６００以上
であることを特徴とする鋼製ショット粒。(1) Steel shot grains containing 0.4 wt% or more of C and made from a hot-worked steel wire rod with a diameter of 0.3 mm or more, and the structure of the grains is tempered martensite. Steel shot grains characterized by a structure and a Vickers hardness of 600 or more.
工して線材と成し、該線材を伸線し、刃物で切断して小
片材と成し、次いで該小片材を角取り処理した後、焼入
れ処理し、焼戻し処理することを特徴とする鋼製ショッ
ト粒の製造方法。(2) Carbon steel containing 0.4 wt% or more of C is hot-worked into a wire rod, the wire rod is drawn and cut with a knife to form small piece materials, and then the small piece materials are made into wire rods. A method for producing steel shot grains, which comprises chamfering, quenching, and tempering.
工して線材と成し、該線材を伸線し、次いで溶断して小
片材と成すと共に焼入れし、次いで焼戻し処理すること
を特徴とする鋼製ショット粒の製造方法。(3) Carbon steel containing 0.4 wt% or more of C is hot worked into a wire rod, the wire rod is drawn, then melted to form small pieces, quenched, and then tempered. A method for producing steel shot grains, characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31626990A JPH04189470A (en) | 1990-11-20 | 1990-11-20 | Steel shot grain and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31626990A JPH04189470A (en) | 1990-11-20 | 1990-11-20 | Steel shot grain and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04189470A true JPH04189470A (en) | 1992-07-07 |
Family
ID=18075221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31626990A Pending JPH04189470A (en) | 1990-11-20 | 1990-11-20 | Steel shot grain and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04189470A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009143697A1 (en) * | 2008-05-30 | 2009-12-03 | 大丰市大奇金属磨料有限公司 | Steel shot grain and manufacturing method thereof |
| JP2010167529A (en) * | 2009-01-22 | 2010-08-05 | Hiroyuki Watanabe | Cut-wire-type long-life shot and manufacturing method of the same |
-
1990
- 1990-11-20 JP JP31626990A patent/JPH04189470A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009143697A1 (en) * | 2008-05-30 | 2009-12-03 | 大丰市大奇金属磨料有限公司 | Steel shot grain and manufacturing method thereof |
| JP2010167529A (en) * | 2009-01-22 | 2010-08-05 | Hiroyuki Watanabe | Cut-wire-type long-life shot and manufacturing method of the same |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3382053B1 (en) | Annealed steel material and method for manufacturing the same | |
| JP2008169411A (en) | Steel for die materials | |
| JP2007284796A (en) | Steel and process for the manufacture of steel component formed by cold plastic deformation | |
| JP5725416B2 (en) | Low carbon cast steel shot | |
| JP2007131907A (en) | Steel for induction hardening with excellent cold workability, and its manufacturing method | |
| JP7062961B2 (en) | Annealed steel and its manufacturing method | |
| KR102548843B1 (en) | cast iron projectiles | |
| JP2012131002A (en) | Steel blasting material | |
| JPH04189470A (en) | Steel shot grain and manufacture thereof | |
| JP2008202078A (en) | Hot-working die steel | |
| JP2009007597A (en) | WEAR RESISTANT HIGH-Cr CAST IRON AND ITS MANUFACTURING METHOD | |
| JP2005048211A (en) | Method for producing steel excellent in fatigue characteristic | |
| JP7205535B2 (en) | Shot used for blasting | |
| JPS58185751A (en) | High speed steel manufactured by powder metallurgy processing | |
| JP2010167529A (en) | Cut-wire-type long-life shot and manufacturing method of the same | |
| JP3258154B2 (en) | Method for producing continuous casting roll and continuous casting roll produced by the method | |
| JP2003266144A (en) | Cold forging method of crank | |
| JPS61149462A (en) | Cored steel for of rock drill | |
| JP6345945B2 (en) | Powdered high-speed tool steel with excellent wear resistance and method for producing the same | |
| JPH0768304A (en) | Rolling roll for bar steel | |
| US6497773B1 (en) | Method of manufacturing a mask for team games | |
| CN117867489A (en) | Laser processing method for prolonging service life of magnesia carbon brick mold by using alloy powder | |
| JP4112464B2 (en) | Method for manufacturing hot forged non-tempered parts with excellent machinability | |
| JPH08311547A (en) | Production of wire rod for spring excellent in wire drawability | |
| JP6312120B2 (en) | Powdered high speed tool steel and manufacturing method thereof |