JP2009172713A - Polishing/cleaning material for abrasive water jet and abrasive water jet using the same material - Google Patents
Polishing/cleaning material for abrasive water jet and abrasive water jet using the same material Download PDFInfo
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Abstract
Description
本発明は、主に、金属、セラミックス、プラスチック、木材などに使用される、アブレイシブウォータージェット用の研掃材に関する。 The present invention relates to an abrasive material for an abrasive water jet, which is mainly used for metals, ceramics, plastics, wood and the like.
コンクリート構造物や基板などの切断、切削、穴開け等の加工処理方法として、研掃材を含む高圧水をノズルから噴射し、ターゲットに衝突させることで加工処理するアブレイシブウォータージェットが知られている（非特許文献１）。 As a processing method for cutting, cutting, drilling, etc. of concrete structures and substrates, an abrasive water jet that performs processing by jetting high-pressure water containing an abrasive from a nozzle and colliding with a target is known. (Non-Patent Document 1).
アブレイシブウォータージェットで使用する研掃材としては、アルミナ、シリカ、シリコンカーバイド、ガーネット、グリット、鋳鉄グリット、鋳鋼グリットが知られている（特許文献１、特許文献２）。
しかしながら、これら研掃材を用いた場合には加工処理後に研掃材粉が発生し、そのため産業廃棄物が発生するといった課題があった。
As the abrasive used in the abrasive water jet, alumina, silica, silicon carbide, garnet, grit, cast iron grit, and cast steel grit are known (Patent Document 1, Patent Document 2).
However, when these scouring materials are used, scouring powder is generated after the processing, and thus there is a problem that industrial waste is generated.
ここで、研掃材とは、金属、セラミックス、プラスチック、木材など対象物の表面を削り取るために使用される硬さが大きな材料を指す。
従来、使用されている研掃材の硬さは、例えば旧モース硬さではアルミナで９、シリカで７、シリコンカーバイドで９．５、ガーネットで７、鋳鉄グリットで７である。
Here, the polishing material refers to a material having high hardness used for scraping the surface of an object such as metal, ceramics, plastic, and wood.
Conventionally, the hardness of the abrasive used is, for example, 9 for alumina, 7 for silica, 9.5 for silicon carbide, 7 for garnet, and 7 for cast iron grit in the old Mohs hardness.
本発明は、加工処理性能が良好であり、かつ、酸溶液に溶解する研掃材を提供する。 The present invention provides a polishing material that has good processing performance and is soluble in an acid solution.
すなわち、本発明は、（１）マグネシアを含有するアブレイシブウォータージェット用研掃材、（２）マグネシアの純度が８０％以上である（１）のアブレイシブウォータージェット用研掃材、（３）酸溶液に溶解する（１）または（２）のアブレイシブウォータージェット用研掃材、（４）粒度が６３〜７１０μｍである（１）〜（３）のいずれかのアブレイシブウォータージェット用研掃材、（５）（１）〜（４）のいずれかの研掃材を用いるアブレイシブウォータージェット、である。 That is, the present invention provides (1) an abrasive material for abrasive water jets containing magnesia, (2) an abrasive material for abrasive water jets according to (1) wherein the purity of magnesia is 80% or more, ( 3) The abrasive material for abrasive water jets of (1) or (2) dissolved in an acid solution, (4) The abrasive water of any one of (1) to (3) having a particle size of 63 to 710 μm (5) Abrasive water jet using the abrasive of any one of (1) to (4).
本発明に依れば、加工処理性能が良好であり、かつ、酸溶液に溶解するアブレイシブウォーター用研掃材を提供できるため、加工処理後に発生する産業廃棄物を低減できる効果を奏するものである。 According to the present invention, it is possible to provide a polishing material for abrasive water that has good processing performance and dissolves in an acid solution, and therefore has an effect of reducing industrial waste generated after processing. It is.
以下、本発明を詳細に説明する。
なお、本発明における部や％は特に規定しない限り質量基準で示す。
Hereinafter, the present invention will be described in detail.
In the present invention, “parts” and “%” are based on mass unless otherwise specified.
本発明は、マグネシアを用いたアブレイシブウォーターの研掃材に関する。 The present invention relates to an abrasive material for abrasive water using magnesia.
本発明で使用するマグネシアは、特に限定されるものではなく、溶融マグネシア、焼結マグネシア、天然マグネシア、および軽焼マグネシアなどのマグネシアが使用可能である。ここでいうマグネシアとは、海水法により海水から抽出された水酸化マグネシア（Ｍｇ（ＯＨ）２）、炭酸マグネシア（ＭｇＣＯ３）、天然ＭｇＯであるマグネサイト、または、天然炭酸マグシアをロータリーキルンなどで焼成して得られる焼結マグネシアクリンカー、その焼結マグネシアクリンカーを電気炉などで溶融して得られる電融マグネシアクリンカーを、所定のサイズに粉砕し、篩い分けしたものである。
アブレイシブウォータージェット用の研掃材として使用した際、硬度に優れ、かつ酸溶液に溶解する面で、マグネシアの純度は８０％以上が好ましく、９５％以上がより好ましい。不純物として、ＣａＯの含有率が２％以下、ＳｉＯ２の含有率が０．５％以下のマグネシアが硬度の面で好ましい。
粒子の形状は特に限定されないが、処理能力の面からも粒子表面にできるだけエッジを有することが好ましい。
マグネシアの粒度は、６３〜７１０μｍが好ましく、７５〜６００μｍがより好ましい。６３μｍより粒度が小さくなると、加工処理の能力が低下する傾向にある。また、７１０μｍより粒度が大きくなると、ノズルが閉そくし易くなったり、酸への溶解性が低下したりする傾向にある。
なお、本発明でいう粒度とは、日本工業規格（ＪＩＳ）のＪＩＳ Ｒ ６００２−１９９８「研削といし用研磨材の粒度の試験方法」に記載の篩い分け試験方法によって質量百分率を算出し、質量百分率が５０％となるときの篩い目開き寸法をさす。
The magnesia used in the present invention is not particularly limited, and magnesia such as molten magnesia, sintered magnesia, natural magnesia, and light-burned magnesia can be used. The magnesia here means magnesia hydroxide (Mg (OH) 2 ), magnesia carbonate (MgCO 3 ) extracted from seawater by the seawater method, magnesite that is natural MgO, or natural magnesia carbonate is baked in a rotary kiln or the like The sintered magnesia clinker obtained by melting the fused magnesia clinker obtained by melting the sintered magnesia clinker in an electric furnace or the like is pulverized to a predetermined size and sieved.
When used as an abrasive for an abrasive water jet, the purity of magnesia is preferably 80% or more and more preferably 95% or more in terms of excellent hardness and dissolution in an acid solution. As impurities, magnesia having a CaO content of 2% or less and a SiO 2 content of 0.5% or less is preferred in terms of hardness.
The shape of the particle is not particularly limited, but it is preferable that the particle surface has an edge as much as possible from the viewpoint of processing ability.
The particle size of magnesia is preferably 63 to 710 μm, and more preferably 75 to 600 μm. When the particle size is smaller than 63 μm, the processing ability tends to decrease. On the other hand, when the particle size is larger than 710 μm, the nozzle tends to be closed easily or the solubility in acid tends to decrease.
The particle size referred to in the present invention is a mass percentage calculated by a screening test method described in JIS R 6002-1998 “Test method for particle size of abrasive for grinding wheel” of Japanese Industrial Standard (JIS). This refers to the sieve opening size when the percentage is 50%.
本発明の研掃材は、アブレイシブウォータージェットに使用する場合、従来の研掃材と同様に使用することができる。 The abrasive of the present invention can be used in the same manner as a conventional abrasive when used in an abrasive water jet.
本発明のアブレイシブウォータージェット用研掃材は、酸溶液に溶解させることで加工処理後に発生する産業廃棄物を低減できることが特徴である。研掃材を酸溶液に溶解する方法は、特に限定されるものではなく、例えば、槽型撹拌機、塔型撹拌機、横型撹拌機などを用いて撹拌・溶解することができる。さらに、研掃材を溶解した溶液は、ｐＨを調整の上、排水することが可能である。 The abrasive for abrasive water jet of the present invention is characterized in that it can reduce industrial waste generated after processing by dissolving in an acid solution. The method for dissolving the abrasive in the acid solution is not particularly limited, and can be stirred and dissolved using, for example, a tank-type stirrer, a tower-type stirrer, a horizontal stirrer, or the like. Furthermore, the solution in which the abrasive is dissolved can be drained after adjusting the pH.
本発明で使用する酸は、特に限定されるものではなく、例えば、塩酸、硫酸、硝酸などの無機酸や、酢酸、蟻酸、シュウ酸、クエン酸などの有機酸を使用することができ、これらのうち一種又は二種以上が使用可能である。
酸溶液の濃度は酸の種類により一義的に決めることはできないが、通常、０．１５〜６ｍｏｌ／ｌが好ましい。濃度が０．１５ｍｏｌ／ｌより低いと研掃材が溶解せず、６ｍｏｌ／ｌより高いと不経済となるため好ましくない。
The acid used in the present invention is not particularly limited. For example, inorganic acids such as hydrochloric acid, sulfuric acid, and nitric acid, and organic acids such as acetic acid, formic acid, oxalic acid, and citric acid can be used. One or more of them can be used.
The concentration of the acid solution cannot be uniquely determined depending on the type of the acid, but usually 0.15 to 6 mol / l is preferable. When the concentration is lower than 0.15 mol / l, the abrasive is not dissolved, and when the concentration is higher than 6 mol / l, it becomes uneconomical.
酸溶液／研掃材の質量比は、０．８〜１０００が好ましく、１〜９８０が好ましい。酸溶液／研掃材比が０．８より小さいと研掃材が溶解せず、１０００より大きいと不経済となる。 The acid solution / abrasive mass ratio is preferably 0.8 to 1000, and more preferably 1 to 980. If the acid solution / abrasive ratio is less than 0.8, the abrasive does not dissolve, and if it is greater than 1000, it becomes uneconomical.
以下、実施例に基づき本発明の詳細を説明するが、本発明はこれらに限定されるものではない。 Hereinafter, although the detail of this invention is demonstrated based on an Example, this invention is not limited to these.
「実施例１」
振動ボールミルを用いて表１に示す粒度の研掃材を調製し、加工処理性能と酸溶解性について評価した。結果を表１に示す。
"Example 1"
Using a vibration ball mill, abrasives having the particle sizes shown in Table 1 were prepared and evaluated for processing performance and acid solubility. The results are shown in Table 1.
＜使用材料＞
研掃材a：海水マグネシア、宇部マテリアルズ社製、商品名「ＵＢＥ９８ＨＤ」、比重３．４、旧モース硬さ５．５、ＭｇＯ９９％、ＣａＯ１％
研掃材ｂ：研掃材aに炭酸カルシウム５％、珪砂１９％を混合し、ＭｇＯの純度を７５％としたもの。
炭酸カルシウム：上越鉱業社製、商品名「タンカル」、比重２．６、旧モース硬さ３、ＣａＯ５５．９％、Ｆｅ２Ｏ３ ０．２％、ＳｉＯ２ ０．１％、強熱減量 ４３．８％
珪砂：宇部サンド工業社製、商品名「珪砂」、比重２．６、旧モース硬さ７、ＳｉＯ２９４％、Ａｌ２Ｏ３ ３％、ＣａＯ ２％、Ｆｅ２Ｏ３ １％
研掃材ｃ：研掃材aに炭酸カルシウム３％、珪砂１６％を混合し、ＭｇＯの純度を８０％としたもの。
炭酸カルシウム：上越鉱業社製、商品名「タンカル」、比重２．６、旧モース硬さ３、ＣａＯ５５．９％、Ｆｅ２Ｏ３ ０．２％、ＳｉＯ２ ０．１％、強熱減量 ４３．８％
珪砂：宇部サンド工業社製、商品名「珪砂」、比重２．６、旧モース硬さ７、ＳｉＯ２９４％、Ａｌ２Ｏ３ ３％、ＣａＯ ２％、Ｆｅ２Ｏ３ １％
研掃材ｄ：研掃材aに炭酸カルシウム２％、珪砂２％を混合し、ＭｇＯの純度を９５％としたもの。
炭酸カルシウム：上越鉱業社製、商品名「タンカル」、比重２．６、旧モース硬さ３、ＣａＯ５５．９％、Ｆｅ２Ｏ３ ０．２％、ＳｉＯ２ ０．１％、強熱減量 ４３．８％
珪砂：宇部サンド工業社製、商品名「珪砂」、比重２．６、旧モース硬さ７、ＳｉＯ２９４％、Ａｌ２Ｏ３ ３％、ＣａＯ ２％、Ｆｅ２Ｏ３ １％
研掃材ｅ：ガーネット、宇部サンド工業社製、商品名「ガーネット」、比重４．０、旧モース硬さ７、ＳｉＯ２３６％、Ａｌ２Ｏ３ ２０％、Ｆｅ２Ｏ３ ３４％、ＭｇＯ ７％、ＣａＯ ３％
酸溶液Ａ：塩酸、和光純薬工業社製、商品名「６ｍｏｌ／ｌ塩酸」
水：蒸留水
<Materials used>
Cleaning material a: Seawater magnesia, manufactured by Ube Materials, trade name “UBE98HD”, specific gravity 3.4, old Mohs hardness 5.5, MgO 99%, CaO 1%
Abrasive material b: Abrasive material a mixed with 5% calcium carbonate and 19% silica sand to make the purity of MgO 75%.
Calcium carbonate: Joetsu Mining Co., Ltd., trade name "Tankaru", specific gravity 2.6, old Mohs hardness 3, CaO55.9%, Fe 2 O 3 0.2%, SiO 2 0.1%, loss on ignition 43 .8%
Silica sand: manufactured by Ube Sand Industry Co., Ltd., trade name “silica sand”, specific gravity 2.6, old Mohs hardness 7, SiO 2 94%, Al 2 O 3 3%, CaO 2%, Fe 2 O 3 1%
Abrasive material c: A material obtained by mixing 3% calcium carbonate and 16% silica sand with the abraded material a so that the purity of MgO is 80%.
Calcium carbonate: manufactured by Joetsu Mining Co., Ltd., trade name “Tangkar”, specific gravity 2.6, old Mohs hardness 3, CaO 55.9%, Fe 2 O 3 0.2%, SiO 2 0.1%, loss on ignition 43 .8%
Silica sand: manufactured by Ube Sand Industry Co., Ltd., trade name “silica sand”, specific gravity 2.6, old Mohs hardness 7, SiO 2 94%, Al 2 O 3 3%, CaO 2%, Fe 2 O 3 1%
Abrasive material d: Abrasive material a mixed with 2% calcium carbonate and 2% silica sand to make the purity of MgO 95%.
Calcium carbonate: manufactured by Joetsu Mining Co., Ltd., trade name “Tangkar”, specific gravity 2.6, old Mohs hardness 3, CaO 55.9%, Fe 2 O 3 0.2%, SiO 2 0.1%, loss on ignition 43 .8%
Silica sand: manufactured by Ube Sand Industry Co., Ltd., trade name “silica sand”, specific gravity 2.6, old Mohs hardness 7, SiO 2 94%, Al 2 O 3 3%, CaO 2%, Fe 2 O 3 1%
Abrasive material e: Garnet, manufactured by Ube Sand Industry Co., Ltd., trade name “Garnet”, specific gravity 4.0, old Mohs hardness 7, SiO 2 36%, Al 2 O 3 20%, Fe 2 O 3 34%, MgO 7%, CaO 3%
Acid solution A: hydrochloric acid, manufactured by Wako Pure Chemical Industries, Ltd., trade name “6 mol / l hydrochloric acid”
Water: distilled water
＜測定方法＞
粒度：篩い目開き寸法が５３μｍ〜１０００μｍであるＪＩＳ Ｚ８８０１に規定する試験用網ふるい１８種類を用意し、篩い目の小さな篩いから順に受け皿へ積み重ねる。試料を１段目の篩いに入れ、ロータップ試験機（衝動数１５６回／分、回転数２９０回／分）を用いて５分間振とうする。各々の篩いと受け皿上の試料重量をはかり、質量百分率を求める。求めた質量百分率から、５０％となるときの篩い目開き寸法を粒度とした。
加工処理性能試験：ウォータージェット加工機（フロージャパン社製、インテグレーテッド・フライング・ブリッジ、吐出圧力：２００ＭＰａ、研掃材供給量：１.０ｋｇ／分）を用いてＳＵＳ製の基板（厚さ２０ｍｍ、幅５０ｍｍ）を幅方向に切断して評価した。５分未満に切断した場合を良、５分以上１０分未満で切断できた場合をやや良、１０分を経過しても切断できなかった場合を不良とした。
酸溶解性試験：酸溶液を入れたビーカーに研掃材を投入し、マグネチックスターラーを用いて２０℃環境下で１２時間撹拌した。撹拌後、研掃材と酸の混合物を、アスピレーターを用いて吸引ろ過し、未溶解の研掃材の量から次式を用いて溶解率を算出した。
溶解率（％）＝（酸溶液に投入した研掃材の量（部）−酸溶液に未溶解の研掃材の量（部））／酸溶液に投入した研掃材の量（部）×１００
<Measurement method>
Grain size: 18 types of test sieves specified in JIS Z8801 having a sieve opening size of 53 μm to 1000 μm are prepared, and stacked in order from a sieve having a small sieve mesh. The sample is put on the first-stage sieve and shaken for 5 minutes using a low-tap tester (number of impulses 156 times / minute, number of rotations 290 times / minute). Weigh the sample on each sieve and pan and determine the mass percentage. From the obtained mass percentage, the sieve opening size at 50% was taken as the particle size.
Processing performance test: SUS substrate (thickness 20 mm) using a water jet processing machine (manufactured by Flow Japan, integrated flying bridge, discharge pressure: 200 MPa, abrasive supply rate: 1.0 kg / min) , Width 50 mm) was cut in the width direction for evaluation. The case where it cut | disconnected in less than 5 minutes was good, the case where it was able to cut | disconnect in 5 minutes or more and less than 10 minutes is a little good, and the case where it was not cut | disconnected even if 10 minutes passed was made into bad.
Acid solubility test: The abrasive was put into a beaker containing an acid solution, and stirred for 12 hours in a 20 ° C. environment using a magnetic stirrer. After stirring, the abrasive and acid mixture was suction filtered using an aspirator, and the dissolution rate was calculated from the amount of undissolved abrasive using the following formula.
Dissolution rate (%) = (Amount of abrasive material added to acid solution (part) −Amount of abrasive material not dissolved in acid solution (part)) / Amount of abrasive material added to acid solution (part) × 100
表１から、本発明のアブレイシブウォータージェット用研掃材（本研掃材）は、従来の研掃材と同等の加工処理性能を示し、かつ、酸溶液への溶解性に優れていることがわかる。さらに、マグネシアの粒度を調整することで良好な効果を発揮することが分かる。 From Table 1, the abrasive material for abrasive water jet according to the present invention (main abrasive material) exhibits a processing performance equivalent to that of a conventional abrasive material and is excellent in solubility in an acid solution. I understand that. Furthermore, it turns out that a favorable effect is exhibited by adjusting the particle size of magnesia.
「実施例２」
酸溶液（塩酸）の濃度を表２に示すように変化したこと以外は実施例１と同様に行った。結果を表２に示す。
"Example 2"
The same procedure as in Example 1 was performed except that the concentration of the acid solution (hydrochloric acid) was changed as shown in Table 2. The results are shown in Table 2.
表２から、本研掃材は、酸の濃度を調整することで良好な酸溶液への溶解性を示すことが分かる。 From Table 2, it can be seen that the present sweep material exhibits good solubility in an acid solution by adjusting the concentration of the acid.
「実施例３」
酸溶液／研掃材比を表３に示すように変化したこと以外は実施例１と同様に行った。結果を表３に示す。
"Example 3"
The same procedure as in Example 1 was performed except that the acid solution / abrasive ratio was changed as shown in Table 3. The results are shown in Table 3.
表３から、本研掃材は、酸溶液／研掃材比を調整することで良好な酸溶液への溶解性を示すことが分かる。 From Table 3, it can be seen that the present abrasive exhibits good solubility in an acid solution by adjusting the acid solution / abrasive ratio.
「実施例４」
酸溶液の種類を表４に示すように変化したこと以外は、実施例１と同様に行なった。結果を表４に示す。
Example 4
The same procedure as in Example 1 was performed except that the type of the acid solution was changed as shown in Table 4. The results are shown in Table 4.
＜使用材料＞
酸溶液Ｂ：硫酸、和光純薬工業社製、商品名「１ｍｏｌ／ｌ硫酸」
酸溶液Ｃ：硝酸、和光純薬工業社製、商品名「１ｍｏｌ／ｌ硝酸」
酸溶液Ｄ：酢酸、和光化学工業社製、商品名「１ｍｏｌ／ｌ酢酸」
<Materials used>
Acid solution B: sulfuric acid, manufactured by Wako Pure Chemical Industries, Ltd., trade name “1 mol / l sulfuric acid”
Acid solution C: nitric acid, manufactured by Wako Pure Chemical Industries, Ltd., trade name “1 mol / l nitric acid”
Acid solution D: Acetic acid, manufactured by Wako Chemical Industry Co., Ltd., trade name “1 mol / l acetic acid”
表４から、本研掃材は酸の種類に関わらず、酸溶液への溶解性に優れていることがわかる。 From Table 4, it can be seen that the present cleaning material is excellent in solubility in an acid solution regardless of the type of acid.
本発明に依れば、加工処理性能が良好であり、かつ、酸溶液に溶解するアブレイシブウォーター用研掃材を提供できるため、加工処理後に発生する産業廃棄物を低減できる効果を有し、金属、セラミックス、プラスチック、木材など広範な分野の対象物について使用することができる。 According to the present invention, the processing performance is good and the abrasive for abrasive water that dissolves in the acid solution can be provided. Therefore, the industrial waste generated after the processing can be reduced. It can be used for a wide range of objects such as metals, ceramics, plastics, and wood.
Claims (5)
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61159373A (en) * | 1984-12-28 | 1986-07-19 | Fuji Photo Film Co Ltd | Blast nozzle |
| JPH11201029A (en) * | 1998-01-19 | 1999-07-27 | Tokuyama Corp | High pressure supply device |
| JP2000176841A (en) * | 1998-12-17 | 2000-06-27 | Gc Corp | Surface treatment method for metal material |
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2008
- 2008-01-24 JP JP2008013228A patent/JP2009172713A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61159373A (en) * | 1984-12-28 | 1986-07-19 | Fuji Photo Film Co Ltd | Blast nozzle |
| JPH11201029A (en) * | 1998-01-19 | 1999-07-27 | Tokuyama Corp | High pressure supply device |
| JP2000176841A (en) * | 1998-12-17 | 2000-06-27 | Gc Corp | Surface treatment method for metal material |
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