JP7641127B2 - Abrasives for shot blasting - Google Patents
Abrasives for shot blasting Download PDFInfo
- Publication number
- JP7641127B2 JP7641127B2 JP2021016228A JP2021016228A JP7641127B2 JP 7641127 B2 JP7641127 B2 JP 7641127B2 JP 2021016228 A JP2021016228 A JP 2021016228A JP 2021016228 A JP2021016228 A JP 2021016228A JP 7641127 B2 JP7641127 B2 JP 7641127B2
- Authority
- JP
- Japan
- Prior art keywords
- abrasive
- raw material
- particle size
- powder
- less
- 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.)
- Active
Links
- 239000003082 abrasive agent Substances 0.000 title claims description 39
- 238000005422 blasting Methods 0.000 title claims description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 56
- 229910052742 iron Inorganic materials 0.000 claims description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 18
- 229910052799 carbon Inorganic materials 0.000 claims description 13
- 239000002994 raw material Substances 0.000 description 55
- 239000002245 particle Substances 0.000 description 54
- 239000000843 powder Substances 0.000 description 53
- 238000000034 method Methods 0.000 description 24
- 239000000203 mixture Substances 0.000 description 10
- 238000012545 processing Methods 0.000 description 10
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 8
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 8
- 239000003830 anthracite Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 238000009826 distribution Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 8
- 239000011538 cleaning material Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000007517 polishing process Methods 0.000 description 6
- 238000000227 grinding Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000001186 cumulative effect Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 238000007873 sieving Methods 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000011362 coarse particle Substances 0.000 description 2
- 238000011946 reduction process Methods 0.000 description 2
- 238000007788 roughening Methods 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- MODGUXHMLLXODK-UHFFFAOYSA-N [Br].CO Chemical compound [Br].CO MODGUXHMLLXODK-UHFFFAOYSA-N 0.000 description 1
- 238000005270 abrasive blasting Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C11/00—Selection of abrasive materials or additives for abrasive blasts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Description
本発明はショットブラスト用研掃材に関するものである。 The present invention relates to an abrasive for shot blasting.
表面処理のひとつの手法であるブラスト処理（研磨、洗浄）は、球状や砥粒状のブラスト材（金属やセラミックスなど）をエアブラスト方式（圧縮空気）やインペラー方式（遠心力投射）などを用い、処理対象物へ高速で材料を吹き付け、その表面を改質させる技術である。ブラスト処理の目的は多岐にわたり、脱錆、素地の清浄化、活性化、粗面化、ピーニング効果などがある。ブラスト材の種類（研掃材）にはスチールショットと呼ばれる球状の鋼球であるショットブラスト、鋭角部を多く持つ粒のグリッドブラストなどがある。 Blasting (polishing, cleaning), a surface treatment technique, is a technique in which spherical or abrasive blasting material (metal, ceramics, etc.) is sprayed at high speed onto the object to be treated using an air blasting method (compressed air) or an impeller method (centrifugal force projection), modifying the surface. The purposes of blasting are diverse, including rust removal, cleaning and activation of the base material, roughening, and peening effects. Types of blasting material (abrasive cleaning materials) include shot blasting, which is a spherical steel ball called steel shot, and grid blasting, which is made of grains with many sharp edges.
特許文献１には、見掛密度が所定範囲の還元鉄粉を表面仕上げ用のショットブラスト材として用いることによって、適度な研磨力を持ちつつ表面仕上げの処理むらを生じさせないようにすることが提案されている。 Patent Document 1 proposes using reduced iron powder with an apparent density within a specified range as a shot blasting material for surface finishing, thereby preventing unevenness in the surface finishing process while providing a moderate abrasive force.
近年、ショットブラスト処理によるアルミニウム基板等の処理対象物の表面仕上げ（例えば粗面化）において従来よりも更に処理むらをなくすことが要求されている。具体的には処理対象物の表面粗さ（Ｒａ）をミクロンレベルまで均一化することが求められている。また研掃材の耐久性の一層の向上も求められている。 In recent years, there has been a demand for more even processing in the surface finishing (e.g., roughening) of objects such as aluminum substrates using shot blasting. Specifically, there is a demand for the surface roughness (Ra) of the objects to be processed to be uniform to the micron level. There is also a demand for further improvement in the durability of abrasives.
そこで本発明の目的は、処理対象物の表面仕上げをミクロンレベルまで均一化することが可能で、また耐久性の高いショットブラスト用研掃材を提供することにある。 The object of the present invention is to provide a highly durable abrasive for shot blasting that can uniformly finish the surface of the object to be treated down to the micron level.
前記目的を達成する本発明に係るショットブラスト用研掃材は、見掛密度が３．０ｇ／ｃｍ３以上４．０ｇ／ｃｍ３以下であり、ＢＥＴ比表面積が０．１０ｍ２／ｇ以上０．５０ｍ２／ｇ以下であることを特徴とする。 The abrasive cleaning material for shot blasting according to the present invention that achieves the above object is characterized in that it has an apparent density of 3.0 g/cm 3 or more and 4.0 g/cm 3 or less, and a BET specific surface area of 0.10 m 2 /g or more and 0.50 m 2 /g or less.
見掛密度が前記範囲であることによって所望の研磨力が発揮されるとともに表面仕上げの均一化が発揮される。またＢＥＴ比表面積が前記範囲であることによってショットブラスト処理による衝撃時の応力が均等化され表面仕上げが均一化するとともに、ショットブラスト処理による研掃材の微粉発生が抑えられ耐久性が向上する。 By having the apparent density in the above range, the desired abrasive power is achieved and the surface finish is made uniform. In addition, by having the BET specific surface area in the above range, the stress during impact due to the shot blasting process is equalized, resulting in a uniform surface finish, and the generation of fine powder from the abrasive material due to the shot blasting process is suppressed, improving durability.
前記構成のショットブラスト用研掃材において、ビッカース硬度が２５０ＨＶ以上３００ＨＶ以下の範囲であるのが好ましい。 In the shot blasting abrasive material having the above-mentioned configuration, it is preferable that the Vickers hardness is in the range of 250 HV or more and 300 HV or less.
前記構成のショットブラスト用研掃材において、前記研掃材における金属鉄の含有量が９４質量％以上９７質量％以下の範囲であるのが好ましい。 In the shot blasting abrasive material having the above-described configuration, it is preferable that the metallic iron content in the abrasive material is in the range of 94% by mass or more and 97% by mass or less.
前記構成のショットブラスト用研掃材において、前記研掃材における炭素の含有量が０．００２質量％以上０．１０質量％以下の範囲であるのが好ましい。 In the shot blasting abrasive material having the above-described configuration, it is preferable that the carbon content in the abrasive material is in the range of 0.002% by mass or more and 0.10% by mass or less.
なお、本明細書における「見掛密度」、「ＢＥＴ比表面積」、「ビッカース硬度」、「金属鉄の含有量」、「炭素の含有量」、「体積平均粒径」は後述の実施例で説明する測定方法によって得られる値である。 In this specification, the terms "apparent density," "BET specific surface area," "Vickers hardness," "metallic iron content," "carbon content," and "volume average particle size" are values obtained by the measurement methods described in the examples below.
本発明に係るショットブラスト用研掃材によれば、処理対象物の表面仕上げをミクロンレベルまで均一化することが可能となる。また、優れた耐久性が得られる。 The shot blasting abrasive of the present invention makes it possible to achieve uniform surface finishing of the object to be treated down to the micron level. It also provides excellent durability.
本発明に係るショットブラスト用研掃材（以下、単に「研掃材」と記すことがある。）の大きな特徴の一つは、見掛密度が３．０ｇ／ｃｍ３以上４．０ｇ／ｃｍ３以下であることである。研掃材の見掛密度が３．０ｇ／ｃｍ３未満であるとショットブラスト処理時に処理対象物表面での衝突応力の大きさにばらつきが生じ処理むらの原因となる。また使用によって研掃材に割れや欠けが発生し耐久性が低くなる。一方、研掃材の見掛密度が４．０ｇ／ｃｍ３を超えると研掃材の生産性や歩留まりが著しく悪化する。研掃材の見掛密度のより好ましい範囲は３．３ｇ／ｃｍ３以上３．７ｇ／ｃｍ３以下の範囲である。 One of the major features of the abrasive material for shot blasting according to the present invention (hereinafter, sometimes simply referred to as "abrasive material") is that the apparent density is 3.0 g/cm 3 or more and 4.0 g/cm 3 or less. If the apparent density of the abrasive material is less than 3.0 g/cm 3 , the magnitude of the impact stress on the surface of the object to be treated during shot blasting varies, causing uneven treatment. In addition, the abrasive material cracks and chips with use, reducing its durability. On the other hand, if the apparent density of the abrasive material exceeds 4.0 g/cm 3 , the productivity and yield of the abrasive material are significantly deteriorated. A more preferable range of the apparent density of the abrasive material is 3.3 g/cm 3 or more and 3.7 g/cm 3 or less.
また本発明に係る研掃材のもう一つの特徴は、ＢＥＴ比表面積が０．１０ｍ２／ｇ以上０．５０ｍ２／ｇ以下であることである。研掃材のＢＥＴ比表面積が０．１０ｍ２／ｇ未満であると処理対象物表面での衝突応力の大きさにばらつきが生じ処理むらの原因となる。一方、研掃材のＢＥＴ比表面積が０．５０ｍ２／ｇを超えると研掃材に割れや欠けが発生しやすくなる。研掃材のＢＥＴ比表面積のより好ましい範囲は０．１５ｍ２／ｇ以上０．３０ｍ２／ｇ以下の範囲である。 Another feature of the abrasive of the present invention is that the BET specific surface area is 0.10 m 2 /g or more and 0.50 m 2 /g or less. If the BET specific surface area of the abrasive is less than 0.10 m 2 /g, the magnitude of the collision stress on the surface of the object to be treated varies, causing uneven treatment. On the other hand, if the BET specific surface area of the abrasive exceeds 0.50 m 2 /g, the abrasive is likely to crack or chip. A more preferable range of the BET specific surface area of the abrasive is 0.15 m 2 /g or more and 0.30 m 2 /g or less.
本発明に係る研掃材のビッカース硬度は２５０ＨＶ以上３００ＨＶ以下の範囲が好ましい。研掃材のビッカース硬度が２５０ＨＶ未満であると、ショットブラスト処理時に処理対象物表面での衝突応力の大きさがばらつき処理むらが生じる虞がある。また使用によって研掃材に割れや欠けが発生する虞もある。一方、研掃材のビッカース硬度が３００ＨＶを超えると、処理対象物の表面粗さが大きくなり処理むらの原因となる虞がある。研掃材のビッカース硬度のより好ましい範囲は２６０ＨＶ以上２８０ＨＶ以下の範囲である。 The Vickers hardness of the abrasive material according to the present invention is preferably in the range of 250 HV to 300 HV. If the Vickers hardness of the abrasive material is less than 250 HV, the magnitude of the impact stress on the surface of the object to be treated during shot blasting may vary, resulting in uneven treatment. There is also a risk that the abrasive material may crack or chip during use. On the other hand, if the Vickers hardness of the abrasive material exceeds 300 HV, the surface roughness of the object to be treated may increase, resulting in uneven treatment. A more preferable range for the Vickers hardness of the abrasive material is 260 HV to 280 HV.
本発明に係る研掃材の金属鉄の含有量は９４質量％以上９７質量％以下の範囲が好ましい。研掃材の金属鉄の含有量が上記範囲であることで研掃材の高耐久性と処理むら抑制が達成される。 The metallic iron content of the abrasive according to the present invention is preferably in the range of 94% by mass to 97% by mass. By having the metallic iron content of the abrasive in the above range, the abrasive is able to achieve high durability and suppress uneven processing.
本発明に係る研掃材の炭素の含有量は０．００２質量％以上０．１０質量％以下の範囲が好ましい。研掃材の炭素の含有量が上記範囲であることで研掃材の高耐久性と処理むら抑制が達成される。研掃材の炭素の含有量のより好ましい範囲は０．０１質量％以上０．１０質量％以下の範囲である。 The carbon content of the abrasive material according to the present invention is preferably in the range of 0.002% by mass or more and 0.10% by mass or less. By having the carbon content of the abrasive material in the above range, high durability of the abrasive material and suppression of processing unevenness are achieved. The more preferable range of the carbon content of the abrasive material is in the range of 0.01% by mass or more and 0.10% by mass or less.
本発明に係る研掃材の体積平均粒径Ｄ５０は１２０μｍ以上１５０μｍ以下の範囲が好ましい。より好ましい研掃材の体積平均粒径Ｄ５０の範囲は１２５μｍ以上１５０μｍ以下の範囲である。 The volume average particle diameter D50 of the abrasive according to the present invention is preferably in the range of 120 μm to 150 μm, and more preferably in the range of 125 μm to 150 μm.
本発明に係る研掃材を用いたショットブラスト処理の対象物の素材としては金属やセラミックス、ガラス、プラスチック、ゴムなどが挙げられる。これらの素材の中でも本発明の研掃材は金属素材に対して好適に使用され、アルミニウム及びアルミニウム合金に対してより好適に使用される。 Materials that can be shot blasted using the abrasive of the present invention include metals, ceramics, glass, plastics, rubber, etc. Among these materials, the abrasive of the present invention is preferably used for metal materials, and more preferably for aluminum and aluminum alloys.
本発明に係る研掃材の材質は、見掛密度およびＢＥＴ比表面積が本発明の規定範囲を満足する限りにおいて特に限定は無いが、ミルスケールなどの酸化鉄を還元して作製される海綿鉄粉が好適である。海綿鉄粉からなる研掃材は例えば次のようにして作製される。 The material of the abrasive material according to the present invention is not particularly limited as long as the apparent density and BET specific surface area satisfy the ranges specified by the present invention, but sponge iron powder made by reducing iron oxide such as mill scale is preferable. Abrasive material made of sponge iron powder is made, for example, as follows.
（研掃材の製造方法）
本発明に係る研掃材の製造方法に特に限定はないが以下に説明する製造方法が好ましい。
(Method of manufacturing abrasives)
Although there is no particular limitation on the method for producing the abrasive according to the present invention, the production method described below is preferred.
まず、製鉄所の熱間圧延工程で生じるミルスケールなどの不純物の少ない酸化鉄を還元剤と共にトンネル炉などの焼成炉に導入し還元処理して海綿鉄ケーキを得る。還元処理の方法としては、特開昭６１－１８３４０２、特開２００５－２６４３０２、特開２００４－６００００などに記載の公知の方法を採用することができる。還元剤としてはコークス粉、石炭などの炭素材が使用可能である。 First, iron oxide with few impurities such as mill scale generated in the hot rolling process of a steelworks is introduced into a baking furnace such as a tunnel furnace together with a reducing agent and reduced to obtain sponge iron cake. The reduction method can be a known method described in JP-A-61-183402, JP-A-2005-264302, JP-A-2004-60000, etc. Carbon materials such as coke powder and coal can be used as the reducing agent.
次に、得られた海綿鉄ケーキを解砕した後に粉砕して粒径５００μｍ以下の海綿鉄粉を得る。解砕処理および粉砕処理は公知の装置ならびに方法を用いることができる。得られた海綿鉄粉を篩い分けし、粒径３００μｍ超、１８０μｍ未満のものを除去して研掃材の第１原料粉とする。 Next, the sponge iron cake obtained is crushed and then pulverized to obtain sponge iron powder having a particle size of 500 μm or less. The crushing and pulverization processes can be performed using known devices and methods. The sponge iron powder obtained is sieved to remove particles having a particle size of more than 300 μm and less than 180 μm to obtain the first raw material powder for the abrasive.
また、第１原料粉と同様の方法によって海綿鉄ケーキを得た後、海綿鉄ケーキを解砕、粉砕し篩分けして粒径３００μｍ超の海綿鉄粉を得る。これを第２原料粉とする。粒径３００μｍ超は篩目で３００μｍの篩上残粉である。 After obtaining sponge iron cake in the same manner as the first raw powder, the sponge iron cake is crushed, pulverized, and sieved to obtain sponge iron powder with a particle size of more than 300 μm. This is called the second raw powder. The particle size of more than 300 μm is the powder remaining on the 300 μm sieve.
なお、第２原料粉は粒径３００μｍ超であればよいが、最大粒径は５００μｍとするのが好ましい。第２原料粉の粒径があまりに大きいと研掃材としたときの研磨力に影響するからである。第２原料粉の最大径および混合量を調整することで研掃材のＢＥＴ比表面積の調整が可能となる。また研掃材のＢＥＴ比表面積は、後述の粉砕処理、研磨処理の時間や強度によっても調整可能である。 The second raw material powder may have a particle size of more than 300 μm, but it is preferable for the maximum particle size to be 500 μm. If the particle size of the second raw material powder is too large, it will affect the abrasive power when used as an abrasive. By adjusting the maximum diameter and mixing amount of the second raw material powder, it is possible to adjust the BET specific surface area of the abrasive. The BET specific surface area of the abrasive can also be adjusted by the time and intensity of the grinding and polishing processes described below.
また第２原料粉は、第１原料粉の破砕処理で発生する粗粒側から分取してもよい。複数回におよび同様の操作を繰り返す場合は、前回の第１原料粉の破砕処理にて発生した粗粒側から分取してもよい。例えば、処理の単位をロット管理にて行う場合は、前回または前々回などのロットにて分取した第２原料粉を用いる。第２原料粉は篩分けをすることで粒径３００μｍ超を分取でき、添加量に応じて複数のロットの第２原料粉を混合しても用いてもよい。 The second raw material powder may be collected from the coarse particles generated in the crushing process of the first raw material powder. When the same operation is repeated multiple times, the second raw material powder may be collected from the coarse particles generated in the previous crushing process of the first raw material powder. For example, when the processing unit is lot-managed, the second raw material powder collected in the previous or previous-previous lot is used. The second raw material powder can be sieved to collect particles with a particle size of over 300 μm, and multiple lots of second raw material powder may be mixed depending on the amount to be added.
次に、第１原料粉と第２原料粉とを、第１原料粉に対して第２原料粉が２０質量％～３５質量％となるように混合して研掃材用原料とする。第２原料粉の混合割合によって、作製される研掃材のＢＥＴ比表面積は調整される。 Next, the first raw material powder and the second raw material powder are mixed so that the ratio of the second raw material powder to the first raw material powder is 20% to 35% by mass to prepare a raw material for the abrasive. The BET specific surface area of the abrasive produced is adjusted by the mixing ratio of the second raw material powder.
この研掃材用原料をノボローターミルで粉砕処理と研磨処理とを同時に行う。従来のハンマーミルを用いた粉砕処理の場合は粉砕の衝撃が大きく、研掃材用原料（鉄粉）表面の海面状構造が崩れて粒度が小さくなる傾向が見られた。これに対して、ノボローターミルによる処理ではローターを回転させて原料粒子同士の接触による研磨が行われるため、粒度が小さくなることが抑制されるとともに見掛密度を高くすることが可能となる。また必要に応じてノボローターミルに所望の目開きのスクリーンを装着することで、ノボローターミル内部の含塵濃度を調整することができ効率のよい粉砕処理が可能となる。 This raw material for the abrasive is simultaneously crushed and polished in a Novo rotor mill. In the case of crushing using a conventional hammer mill, the impact of the crushing is large, and the sea-like structure on the surface of the raw material for the abrasive (iron powder) tends to collapse, resulting in a smaller particle size. In contrast, in processing using a Novo rotor mill, the rotor is rotated and polishing is performed by contact between the raw material particles, which prevents the particle size from becoming smaller and makes it possible to increase the apparent density. In addition, by attaching a screen with the desired mesh size to the Novo rotor mill as necessary, the dust concentration inside the Novo rotor mill can be adjusted, enabling efficient crushing processing.
また従来の方法（特開２０１６－６９７０８に開示）では、１種類の粒度の原料のみ（２００μｍ～３００μｍ）を使用していたので原料が粉砕されやすく、粉砕処理における微粉（例えば粒径１０６μｍ以下）の発生量が多く生産性が悪かった。これに対して、第１原料粉に第１原料粉よりも粗粒の第２原料粉を混合して使用するこの製造方法では、原料粉（鉄粉）の海綿状構造が崩れにくくなって、高い見掛密度と所望のＢＥＴ比表面積とを有する研掃材が効率的に製造することが可能である。 Furthermore, in the conventional method (disclosed in JP 2016-69708 A), only raw material of one type of particle size (200 μm to 300 μm) was used, so the raw material was easily crushed, and a large amount of fine powder (for example, particle size 106 μm or less) was generated in the crushing process, resulting in poor productivity. In contrast, in this manufacturing method, in which the first raw material powder is mixed with the second raw material powder, which is coarser than the first raw material powder, the spongy structure of the raw material powder (iron powder) is less likely to collapse, making it possible to efficiently manufacture an abrasive having a high apparent density and a desired BET specific surface area.
なお、従来の１種類の粒度の原料を使用する場合、あるいは第１原料粉よりも微粒の第２原料粉を混合して使用する場合であっても、例えば粉砕装置としてカッターミルを使用することによって原料粒子表面の研磨が可能となり、ノボローターミルよりも粉砕強度が弱いため、原料の粒度が小さくなるのを抑制しながら見掛密度を高くすることが可能となる。 Even when using raw materials of one type of particle size as in the past, or when mixing and using a second raw material powder that is finer than the first raw material powder, it is possible to polish the surface of the raw material particles by using, for example, a cutter mill as a grinding device, and since the grinding strength is weaker than that of a noborotor mill, it is possible to increase the apparent density while preventing the raw material particle size from becoming smaller.
ノボローターミルによる粉砕処理及び研磨処理は、処理後の研掃材の見掛密度を測定して所望の見掛密度になるまで繰り返し行ってもよい。また処理後に、使用目的等に応じて必要により篩やサイクロン等を用いて研掃材の粒度分布を調整してもよい。例えば粒径が１８０μｍ以上４２５μｍ以下、１５０μｍ以上３００μｍ以下、１２５μｍ以上２５０μｍ以下、１０６μｍ以上１８０μｍ以下、７５μｍ以上１５０μｍ以下などに粒度調整してもよい。また粉砕処理と研磨処理とは別の処理装置で実施しても構わない。 The crushing and polishing processes using a Novo rotor mill may be repeated until the desired apparent density is reached by measuring the apparent density of the abrasive after the process. After the process, the particle size distribution of the abrasive may be adjusted using a sieve or cyclone, if necessary, depending on the intended use. For example, the particle size may be adjusted to 180 μm to 425 μm, 150 μm to 300 μm, 125 μm to 250 μm, 106 μm to 180 μm, 75 μm to 150 μm, etc. The crushing process and the polishing process may be performed using separate processing equipment.
実施例１
（第１原料粉の作製）
原料としてのミルスケール（酸化鉄）をロータリードライヤーで１２０℃で乾燥させた後に、還元剤としての無煙炭を添加混合した。この無煙炭は、固定炭素が８０～９０％、サイズが４ｍｍ以下のものを用いた。このミルスケールと無煙炭との混合物とは別に、固定炭素が５０～９０％のコークス粉を準備した。
Example 1
(Preparation of first raw material powder)
The mill scale (iron oxide) as the raw material was dried at 120°C in a rotary dryer, and then anthracite as a reducing agent was added and mixed. The anthracite used had a fixed carbon content of 80-90% and a size of 4 mm or less. In addition to the mixture of the mill scale and anthracite, coke powder with a fixed carbon content of 50-90% was prepared.
炭化ケイ素製の耐熱容器にミルスケールと無煙炭との混合物を円筒状に充填し、その中心と外側にコークス粉を充填した。そして耐熱容器をトンネルキルン炉にて１０５０℃～１２５０℃の温度範囲で大気雰囲気中で還元処理し海綿鉄ケーキを得た。 A mixture of mill scale and anthracite was filled into a silicon carbide heat-resistant container in a cylindrical shape, and coke powder was filled in the center and on the outside. The heat-resistant container was then subjected to a reduction treatment in an atmospheric tunnel kiln at temperatures ranging from 1050°C to 1250°C to obtain a sponge iron cake.
上記還元処理により得られた海綿鉄ケーキを下記の順で粉砕し第１原料粉を得た。
（１）ロールクラッシャーよって粒度約３０ｃｍ以下まで粗破砕
（２）ハンマークラッシャーによって粒度約４ｃｍ以下まで微破砕
（３）ハンマーミルによって粒度約４ｍｍ以下まで粗粉砕
（４）ノボローターミルによって粒度５００μｍ以下まで微粉砕
（５）篩い分けによって粒径３００μｍ超、１８０μｍ未満のものを除去
The sponge iron cake obtained by the above reduction treatment was pulverized in the following order to obtain a first raw material powder.
(1) Coarse crushing using a roll crusher to a particle size of approximately 30 cm or less. (2) Fine crushing using a hammer crusher to a particle size of approximately 4 cm or less. (3) Coarse crushing using a hammer mill to a particle size of approximately 4 mm or less. (4) Fine crushing using a Novo rotor mill to a particle size of 500 μm or less. (5) Sieving to remove particles with a particle size of more than 300 μm and less than 180 μm.
（第２原料粉の作製）
第１原料粉と同様にして、海綿鉄ケーキを得た後、海綿鉄ケーキを破砕、粉砕して粒径３００μｍ超の第２原料粉を得た。
(Preparation of second raw material powder)
A sponge iron cake was obtained in the same manner as in the first raw material powder, and then the sponge iron cake was crushed and pulverized to obtain a second raw material powder having a particle size of more than 300 μm.
（研掃材用原料の作製）
第１原料粉に対して第２原料粉を２５質量％加えて研掃材用原料を作製した。
(Preparation of raw materials for abrasives)
The second raw material powder was added to the first raw material powder in an amount of 25 mass % to prepare a raw material for the abrasive.
（粉砕処理および研磨処理）
作製した研掃材用原料をノボローターミルによって粉砕処理と研磨処理とを同時に行った。そして所定時間の処理後の研掃材原料の見掛密度を測定して見掛密度が３．０ｇ／ｃｍ３～４．０ｇ／ｃｍ３の範囲になるまで繰り返し行った。
上記研掃材の見掛密度調整品に対し、分級点１０μｍのサイクロンにて分級処理を実施した後に、振動篩によって粒径１８０μｍ以上を除去して実施例１に係る研掃材を得た。得られた研掃材の組成及び粉体特性を下記方法によって測定した。測定結果を表１に示す。また図１に研掃材のＳＥＭ写真（倍率２００倍）を示す。
(Crushing and grinding)
The prepared raw material for the abrasive was simultaneously crushed and polished by a Novo rotor mill. The apparent density of the raw material for the abrasive was measured after a predetermined period of processing, and the process was repeated until the apparent density was within the range of 3.0 g/cm 3 to 4.0 g/cm 3 .
The above-mentioned abrasive with an adjusted apparent density was classified in a cyclone with a classification point of 10 μm, and then particles with a particle size of 180 μm or more were removed using a vibrating sieve to obtain the abrasive according to Example 1. The composition and powder characteristics of the obtained abrasive were measured by the following method. The measurement results are shown in Table 1. Also, an SEM photograph (magnification 200 times) of the abrasive is shown in Figure 1.
（組成分析）
（全鉄（Ｔ．Ｆｅ））
ＪＩＳ Ｍ８２１２に準じて全鉄量（Ｔ．Ｆｅ）を測定した。
(Composition Analysis)
(Total Iron (T.Fe))
The total iron content (T.Fe) was measured in accordance with JIS M8212.
（金属鉄（Ｍ．Ｆｅ））
試料中の金属鉄量の測定は、ＪＩＳ Ｍ８７１３－１９９３「鉄鉱石類の還元試験方法」の解説 参考 ６．１金属鉄定量方法に準拠して、試料を臭素－メタノール溶液中で撹拌し、金属鉄を抽出・溶解し、電位差自動滴定装置を用いてキレートで滴定する方法で行った。
(Metallic iron (M.Fe))
The amount of metallic iron in the sample was measured in accordance with JIS M8713-1993 "Reduction test method for iron ores", Reference 6.1 Metallic iron determination method, by stirring the sample in a bromine-methanol solution to extract and dissolve the metallic iron, and then titrating it with the chelate using an automatic potentiometric titrator.
（炭素（Ｃ），硫黄（Ｓ））
炭素と硫黄は、炭素・硫黄分析装置（ＬＥＣＯ製 ＣＳ－７４４）を用いて算出した。
(Carbon (C), Sulfur (S))
Carbon and sulfur were calculated using a carbon/sulfur analyzer (CS-744, manufactured by LECO).
（酸素（Ｏ））
試料中の酸素は、酸素・窒素分析装置（ＬＥＣＯ製 ＴＣＨ６００）を用いて算出した。
(Oxygen (O))
The oxygen in the sample was calculated using an oxygen/nitrogen analyzer (TCH600 manufactured by LECO).
（見掛密度）
研掃材の見掛密度は、「ＪＩＳ Ｚ ２５０４」の金属粉の見掛密度試験方法の手順に従って測定した。
(Apparent density)
The apparent density of the abrasive was measured according to the procedure of the test method for apparent density of metal powder in "JIS Z 2504".
（ＢＥＴ比表面積）
研掃材のＢＥＴ比表面積は、ＢＥＴ一点法比表面積測定装置（株式会社マウンテック製、型式：Ｍａｃｓｏｒｂ ＨＭ ｍｏｄｅｌ－１２０８）を用いて測定した。具体的には、サンプルは、５．０００ｇを秤量して直径１２ｍｍの標準セルに充填し、２００℃で、３０分間脱気して測定を行った。
(BET specific surface area)
The BET specific surface area of the abrasive was measured using a BET single point specific surface area measuring device (Macsorb HM model-1208, manufactured by Mountec Co., Ltd.) Specifically, 5,000 g of the sample was weighed out and filled into a standard cell with a diameter of 12 mm, and the sample was degassed at 200° C. for 30 minutes before measurement.
（粒度分布：篩分け）
研掃材の粒度分布は、ＪＩＳ Ｚ ８８１５に定められた方法を用いて篩分けすることによって測定した。なお、粒度は篩の目開きによって定まる。
(Particle size distribution: sieving)
The particle size distribution of the abrasive was measured by sieving using the method specified in JIS Z 8815. The particle size is determined by the opening of the sieve.
（粒度分布：レーザー回折式粒度分布測定装置ＭＴ）
研掃材の粒度分布（Ｄ１０，Ｄ５０，Ｄ９０）は、レーザー回折式粒度分布測定装置ＭＴ（日機装社製「マイクロトラックＭｏｄｅｌ９３２０－Ｘ１００」）を用いて測定した。測定については、体積基準で、累積１０％の粒径Ｄ１０（μｍ）、累積５０％の平均粒径Ｄ５０（μｍ）、累積９０％の粒径Ｄ９０の値を得た。
(Particle size distribution: Laser diffraction particle size distribution measuring device MT)
The particle size distribution ( D10 , D50 , D90 ) of the abrasive was measured using a laser diffraction particle size distribution measuring device MT (Microtrac Model 9320-X100 manufactured by Nikkiso Co., Ltd.). The measurements were performed using the volumetric values of the cumulative 10% particle size D10 (μm), cumulative 50% average particle size D50 (μm), and cumulative 90% particle size D90 .
（ビッカース硬度）
研掃材のビッカース硬度測定は、樹脂中に研掃材を添加して硬化させ、回転研磨機を用いて表面を研磨、断面を析出させた後、ナノインデンター（エリオニクス製「ＥＮＴ１１００－ｂ」を用いた。ナノインデンターの測定条件としては、負荷－除荷試験モードで、常温、２５ｍｍＮの荷重とした。
(Vickers hardness)
The Vickers hardness of the abrasive was measured by adding the abrasive to a resin, hardening it, polishing the surface with a rotary polisher, and then precipitating the cross section, and then using a nanoindenter ("ENT1100-b" manufactured by Elionix). The measurement conditions for the nanoindenter were load-unload test mode, room temperature, and a load of 25 mmN.
（真密度）
真密度測定装置（ＭＩＣＲＯＭＥＲＩＴＩＣＳ社製 アキュピックＩＩ １３４０シリーズ）を用いて測定した。
(True Density)
The true density was measured using a true density measuring device (MICROMERITICS Accupic II 1340 series).
（処理むら評価）
ショットブラスト試験機（エアーブラスト方式）を用いてエアー圧力０．２８ＭＰａで処理対象物（アルミニウム基板；Ａ６０６３）に研掃材を投射量約１７ｇ／ｓｅｃで投射した。ショットブラスト後の処理対象物の表面粗さ（算術平均高さＲａ、二乗平均平方根高さＲｑ、最大高さＲｚ）の平均値Ａｖｇを測定すると共に変動係数ＣＶを算出した。変動係数が小さいほど処理むらが少ないと評価する。
(Evaluation of uneven processing)
Using a shot blasting tester (air blasting method), the abrasive was projected at an air pressure of 0.28 MPa onto the object to be treated (aluminum substrate; A6063) at a projection rate of approximately 17 g/sec. The average value Avg of the surface roughness (arithmetic mean height Ra, root mean square height Rq, maximum height Rz) of the object to be treated after shot blasting was measured, and the coefficient of variation CV was calculated. The smaller the coefficient of variation, the less the processing unevenness was evaluated to be.
（耐久性評価）
アービンテストマシン（ＥＲＶＩＮ社製）を用いてインペラー回転数５０００ｒｐｍで研掃材を炭素鋼に５００回衝突させた。そして、衝突後の研掃材の粒度分布を測定し、粒径１０６μｍ以下の微粉の増加割合を下記式（１）から算出した。アービンテスト後の微粉の増加割合が少ないほど耐久性のある研掃材と評価する。
粒径１０６μｍ以下の微粉の増加割合（ｗｔ％）＝（Ｂ－Ａ）／Ａ×１００・・・（１）
Ａ：耐久性評価前の粒径１０６μｍ以下の質量割合
Ｂ：耐久性評価後の粒径１０６μｍ以下の質量割合
(Durability evaluation)
Using an Ervin test machine (manufactured by ERVIN), the abrasive was collided 500 times against carbon steel at an impeller rotation speed of 5000 rpm. The particle size distribution of the abrasive after the collision was measured, and the increase in the fine powder with a particle size of 106 μm or less was calculated from the following formula (1). The smaller the increase in the fine powder after the Ervin test, the more durable the abrasive is evaluated to be.
Increase rate of fine powder with a particle size of 106 μm or less (wt%)=(B−A)/A×100 (1)
A: Mass ratio of particles having a particle size of 106 μm or less before durability evaluation B: Mass ratio of particles having a particle size of 106 μm or less after durability evaluation
実施例２
第１原料粉のみを使用し、粉砕処理および研磨処理において、装置をカッターミル方式に変更した事以外は、実施例１と同様に研掃材を作製した。作製した研掃材の組成及び粉体特性を実施例１と同様にして測定した。測定結果を表１に示す。また図２に研掃材のＳＥＭ写真（倍率２００倍）を示す。
Example 2
An abrasive was prepared in the same manner as in Example 1, except that only the first raw material powder was used and the grinding and polishing processes were carried out using a cutter mill. The composition and powder characteristics of the prepared abrasive were measured in the same manner as in Example 1. The measurement results are shown in Table 1. Also, an SEM photograph (magnification 200 times) of the abrasive is shown in Figure 2.
実施例３
第１原料粉を目開き２１７μｍの篩を用いて篩分け、粒径２１７μｍ以下のものを原料粉とした以外は実施例４と同様に研掃材を作製した。作製した研掃材の組成及び粉体特性を実施例１と同様にして測定した。測定結果を表１に示す。
Example 3
The first raw material powder was sieved using a sieve with a mesh size of 217 μm, and the raw material powder was selected from those having a particle size of 217 μm or less. Except for this, an abrasive was prepared in the same manner as in Example 4. The composition and powder characteristics of the prepared abrasive were measured in the same manner as in Example 1. The measurement results are shown in Table 1.
比較例１
実施例１と同様にして第１原料粉に対して第２原料粉を２５質量％加えて研掃材用原料とした。そして、粉砕処理および研磨処理を行わずに、振動篩によって上記研掃材原料から粒径１８０μｍ以上を除去して研掃材とした。この研掃材の組成及び粉体特性を実施例１と同様にして測定した。測定結果を表１に示す。また図３に研掃材のＳＥＭ写真（倍率２００倍）を示す。
Comparative Example 1
As in Example 1, 25% by mass of the second raw material powder was added to the first raw material powder to prepare a raw material for the abrasive cleaning material. Then, without carrying out a crushing process or a polishing process, particles with a particle size of 180 μm or more were removed from the raw material for the abrasive cleaning material using a vibrating sieve to prepare the abrasive cleaning material. The composition and powder characteristics of this abrasive cleaning material were measured in the same manner as in Example 1. The measurement results are shown in Table 1. Also, an SEM photograph (magnification 200 times) of the abrasive cleaning material is shown in Figure 3.
比較例２
（第１原料粉の作製）
原料としてのミルスケール（酸化鉄）をロータリードライヤーで１２０℃で乾燥させた後に、還元剤としての無煙炭を添加混合した。この無煙炭は、固定炭素が８０～９０％、サイズが４ｍｍ以下のものを用いた。このミルスケールと無煙炭との混合物とは別に、固定炭素が５０～９０％のコークス粉を準備した。
Comparative Example 2
(Preparation of first raw material powder)
The mill scale (iron oxide) as the raw material was dried at 120°C in a rotary dryer, and then anthracite as a reducing agent was added and mixed. The anthracite used had a fixed carbon content of 80-90% and a size of 4 mm or less. In addition to the mixture of the mill scale and anthracite, coke powder with a fixed carbon content of 50-90% was prepared.
炭化ケイ素製の耐熱容器にミルスケールと無煙炭との混合物を円筒状に充填し、その中心と外側にコークス粉を充填した。そして耐熱容器をトンネルキルン炉にて１０５０℃～１２５０℃の温度範囲で大気雰囲気中で一次還元処理しで一次還元海綿鉄ケーキを得た。 A mixture of mill scale and anthracite was filled into a silicon carbide heat-resistant container in a cylindrical shape, and coke powder was filled in the center and on the outside. The heat-resistant container was then subjected to primary reduction treatment in a tunnel kiln furnace in the air at temperatures ranging from 1050°C to 1250°C to obtain a primary reduced sponge iron cake.
上記一次還元処理により得られた海綿鉄ケーキを、ベルト炉を使用し、雰囲気制御としてアンモニア分解ガスを用い、９００℃の条件で二次還元処理し二次還元海綿鉄ケーキを得た。次に、この二次還元海綿鉄ケーキをハンマーミルで解粒し第１原料粉とした。 The sponge iron cake obtained by the above-mentioned primary reduction process was subjected to secondary reduction process at 900°C using a belt furnace and ammonia decomposition gas as atmospheric control to obtain a secondary reduced sponge iron cake. Next, this secondary reduced sponge iron cake was pulverized in a hammer mill to obtain the first raw material powder.
このように作製した第１原料粉を研掃材用原料とした。そして、粉砕処理および研磨処理を行わずに、振動篩によって上記研掃材原料から粒径１８０μｍ以上を除去して研掃材とした。この研掃材の組成及び粉体特性を実施例１と同様にして測定した。測定結果を表１に示す。また図４に研掃材のＳＥＭ写真（倍率２００倍）を示す。 The first raw powder thus prepared was used as the raw material for the abrasive. Then, without carrying out a crushing process or a polishing process, particles with a particle size of 180 μm or more were removed from the raw material abrasive using a vibrating sieve to obtain the abrasive. The composition and powder characteristics of this abrasive were measured in the same manner as in Example 1. The measurement results are shown in Table 1. Also, an SEM photograph (magnification 200 times) of the abrasive is shown in Figure 4.
表１から明らかなように、見掛密度が３．４３ｇ／ｃｍ３～３．６３ｇ／ｃｍ３、ＢＥＴ比表面積が０．１７ｍ２／ｇ～０．２３ｍ２／ｇと本発明の規定範囲内である実施例１～３の研掃材は、見掛密度が２．６４ｇ／ｃｍ３と本発明の規定範囲よりも小さい比較例１の研掃材および見掛密度が２．６１ｇ／ｃｍ３、ＢＥＴ比表面積が０．０９ｍ２／ｇと本発明の規定範囲よりもいずれも小さい比較例２の研掃材に比べて、処理対象物の表面粗さ（算術平均高さＲａ、二乗平均平方根高さＲｑ、最大高さＲａ）の変動係数ＣＶは格段に小さかった。すなわち実施例１～３の研掃材は比較例１，２の研掃材に比べて処理むらは小さかった。 As is clear from Table 1, the abrasives of Examples 1 to 3, which have apparent densities of 3.43 g/cm 3 to 3.63 g/cm 3 and BET specific surface areas of 0.17 m 2 /g to 0.23 m 2 /g within the ranges specified by the present invention, had significantly smaller coefficients of variation CV of the surface roughness (arithmetic mean height Ra , root mean square height Rq, maximum height Ra) of the object to be treated than the abrasives of Comparative Example 1, which has an apparent density of 2.64 g /cm 3 , which is smaller than the range specified by the present invention, and the abrasives of Comparative Example 2, which have apparent densities of 2.61 g/cm 3 and BET specific surface areas of 0.09 m 2 /g, both of which are smaller than the ranges specified by the present invention. That is, the abrasives of Examples 1 to 3 had smaller treatment unevenness than the abrasives of Comparative Examples 1 and 2.
また実施例１～３の研掃材は比較例１，２の研掃材に比べてアービンテスト後の粒径１０６μｍ以下の微粉の増加割合が少なく耐久性に優れていた。 In addition, the abrasives of Examples 1 to 3 had a smaller increase in fine powder with a particle size of 106 μm or less after the Irvine test than the abrasives of Comparative Examples 1 and 2, and were more durable.
本発明に係るショットブラスト用研掃材によれば、処理対象物の表面仕上げをミクロンレベルまで均一化することが可能となり、また優れた耐久性が得られる。 The shot blasting abrasive of the present invention makes it possible to uniformly finish the surface of the object to be treated down to the micron level, and also provides excellent durability.
Claims (3)
見掛密度が３．０ｇ／ｃｍ３以上４．０ｇ／ｃｍ３以下であり、
ＢＥＴ比表面積が０．１５ｍ２／ｇ以上０．３０ｍ２／ｇ以下であり、
ビッカース硬度が２６０ＨＶ以上２８０ＨＶ以下の範囲である
ことを特徴とするショットブラスト用研掃材。 An abrasive for use in shot blasting,
The apparent density is 3.0 g/ cm3 or more and 4.0 g/ cm3 or less,
The BET specific surface area is 0.15 m 2 /g or more and 0.30 m 2 /g or less,
An abrasive for shot blasting, characterized in that the Vickers hardness is in the range of 260 HV or more and 280 HV or less.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021016228A JP7641127B2 (en) | 2021-02-04 | 2021-02-04 | Abrasives for shot blasting |
| CN202210112708.0A CN114851094B (en) | 2021-02-04 | 2022-01-29 | Sweeping material for shot blasting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021016228A JP7641127B2 (en) | 2021-02-04 | 2021-02-04 | Abrasives for shot blasting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2022119253A JP2022119253A (en) | 2022-08-17 |
| JP7641127B2 true JP7641127B2 (en) | 2025-03-06 |
Family
ID=82628410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2021016228A Active JP7641127B2 (en) | 2021-02-04 | 2021-02-04 | Abrasives for shot blasting |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP7641127B2 (en) |
| CN (1) | CN114851094B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5512006A (en) | 1993-10-29 | 1996-04-30 | Ultra Blast Partners | Method for enhancing the rust resistance and the surface finish of a non-ferrous workpiece |
| JP2000167772A (en) | 1998-12-04 | 2000-06-20 | Toyota Motor Corp | Cut wire iron shot for blasting |
| JP2016069708A (en) | 2014-09-30 | 2016-05-09 | Ｄｏｗａホールディングス株式会社 | Surface finish iron powder and its manufacturing method |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51106293A (en) * | 1975-03-14 | 1976-09-21 | Hitachi Shipbuilding Eng Co | Shotsutono funmatsuchokusetsuseizoho |
| JPS579855A (en) * | 1980-06-20 | 1982-01-19 | Ito Kiko Kk | Steel shot |
| JPH0761614B2 (en) * | 1992-07-02 | 1995-07-05 | 東ソー株式会社 | Zirconia shot material |
| US5856254A (en) * | 1996-02-15 | 1999-01-05 | Vaw Silizium Gmbh | Spherical metal-oxide powder particles and process for their manufacture |
| DE19605556C1 (en) * | 1996-02-15 | 1997-09-11 | Vaw Silizium Gmbh | Reactive spherical metal oxide powder particles |
| JP3986384B2 (en) * | 2002-07-12 | 2007-10-03 | 三井金属鉱業株式会社 | Cerium-based abrasive and method for producing the same |
| JP5261203B2 (en) * | 2009-01-09 | 2013-08-14 | 株式会社神戸製鋼所 | Aluminum alloy spacer and manufacturing method thereof |
| JP5787215B2 (en) * | 2011-06-14 | 2015-09-30 | 新東工業株式会社 | Zinc-based alloy shot |
| JP6403516B2 (en) * | 2014-09-25 | 2018-10-10 | 日新製鋼株式会社 | High-strength plate steel, manufacturing method thereof and discharge valve parts |
| WO2019178290A1 (en) * | 2018-03-13 | 2019-09-19 | Saint-Gobain Ceramics & Plastics, Inc. | Particulate material and method for forming same |
-
2021
- 2021-02-04 JP JP2021016228A patent/JP7641127B2/en active Active
-
2022
- 2022-01-29 CN CN202210112708.0A patent/CN114851094B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5512006A (en) | 1993-10-29 | 1996-04-30 | Ultra Blast Partners | Method for enhancing the rust resistance and the surface finish of a non-ferrous workpiece |
| JP2000167772A (en) | 1998-12-04 | 2000-06-20 | Toyota Motor Corp | Cut wire iron shot for blasting |
| JP2016069708A (en) | 2014-09-30 | 2016-05-09 | Ｄｏｗａホールディングス株式会社 | Surface finish iron powder and its manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114851094A (en) | 2022-08-05 |
| CN114851094B (en) | 2024-05-28 |
| JP2022119253A (en) | 2022-08-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1394229A (en) | Cerium based abrasive material and method for producing cerium based abrasive material | |
| CN1162499C (en) | Cerium-based abrasive, its raw material and its preparation method | |
| JP6213695B2 (en) | Casting polishing method | |
| CN108026433B (en) | Cerium-based abrasive and method for producing the same | |
| JP3296091B2 (en) | Alpha-alumina for abrasive and method for producing the same | |
| JP7641127B2 (en) | Abrasives for shot blasting | |
| KR20030038673A (en) | Narrow size-ranged single crystalline minute diamond particles and method for the production thereof | |
| CN101735768B (en) | Method for preparing rare earth polishing powder | |
| JP4284771B2 (en) | Α-alumina abrasive for metal polishing and its production method | |
| CN112500801B (en) | Cerium-based rare earth polishing powder and preparation method and application thereof | |
| JP4420391B2 (en) | Cerium-based abrasive | |
| CN107000165B (en) | Project material | |
| JP4940289B2 (en) | Abrasive | |
| JP4131870B2 (en) | Abrasive particle quality evaluation method, glass polishing method and abrasive composition for polishing glass | |
| JP3875668B2 (en) | Cerium-based abrasive containing fluorine and method for producing the same | |
| JP4290465B2 (en) | Method for producing cerium-based abrasive mainly composed of cerium oxide | |
| JP3687898B2 (en) | Method for producing cerium-based abrasive and cerium-based abrasive produced using the method | |
| JP2016069708A (en) | Surface finish iron powder and its manufacturing method | |
| JP4395049B2 (en) | Cerium-based abrasive and method for producing cerium-based abrasive | |
| JP4540611B2 (en) | Cerium-based abrasive and method for producing cerium-based abrasive | |
| JP3838871B2 (en) | Method for producing raw material for cerium-based abrasive and raw material for cerium-based abrasive produced by the method | |
| JP2019210444A (en) | Super fine abrasive having highly irregular shape | |
| JP2002235071A (en) | Method for producing cerium-based abrasive particles | |
| JP2002212544A (en) | Method for producing cerium oxide-based abrasive and cerium oxide-based abrasive obtained by the method | |
| JP2003261861A (en) | Cerium-based abrasive and method for evaluating dispersibility of cerium-based abrasive |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20220224 |
|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20220224 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20221214 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20230110 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20230530 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20230905 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20231024 |
|
| A911 | Transfer to examiner for re-examination before appeal (zenchi) |
Free format text: JAPANESE INTERMEDIATE CODE: A911 Effective date: 20231102 |
|
| A912 | Re-examination (zenchi) completed and case transferred to appeal board |
Free format text: JAPANESE INTERMEDIATE CODE: A912 Effective date: 20231201 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20241118 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20250221 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 7641127 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |