JPH1094969A - Grinding wheel for polishing austenite stainless steel - Google Patents
Grinding wheel for polishing austenite stainless steelInfo
- Publication number
- JPH1094969A JPH1094969A JP27306696A JP27306696A JPH1094969A JP H1094969 A JPH1094969 A JP H1094969A JP 27306696 A JP27306696 A JP 27306696A JP 27306696 A JP27306696 A JP 27306696A JP H1094969 A JPH1094969 A JP H1094969A
- Authority
- JP
- Japan
- Prior art keywords
- polishing
- binder
- abrasive grain
- rate
- stainless steel
- 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.)
- Withdrawn
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- Polishing Bodies And Polishing Tools (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、難研磨材であるオース
テナイト系ステンレス鋼を高能率に研磨できるレジンボ
ンド砥石に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin-bonded grindstone capable of polishing austenitic stainless steel, which is a hard-to-polish material, with high efficiency.
【0002】[0002]
【従来の技術】オーステナイト系ステンレス鋼は、優れ
た耐食性及び表面性状を活用し、厨房用機器,装飾用鋼
材等として使用されている。表面光沢が要求される用途
に使用する場合、各種研磨方法でステンレス鋼を研磨仕
上げしている。特に、研磨前母材の平坦出し,疵取り等
の粗研磨では、PVA弾性砥石やレジンボンド砥石が使
用されている。これらの砥石を使用する研磨では、図1
に示すように複数の砥石1,1・・を等間隔で円周配列
したディスク2を回転軸3を回転させながら、被研磨材
である金属板に弾性砥石1,1・・を押し付け、研磨す
る。PVA弾性砥石での粗研磨では、その研磨能力の低
さから粗研磨での適用では多大な工数を必要とする。こ
のようなことから、一般にPVA弾性砥石より研磨能力
が高いといわれているレジンボンド砥石の適用が検討さ
れるが、砥石の組成により研磨後の表面品質(表面粗
さ)が大きく変化し、砥粒粒度相応の表面粗さを得るこ
とが非常に困難であり、研磨能力も大きく変化すること
が判っている。粗研磨能力の検討ではないが、砥石研磨
による仕上げ表面の平坦度,微小変位,板厚精度等の均
一性を改善するため、種々の改良が砥石研磨に施されて
きている。たとえば、特開平2−9587号公報では、
砥粒率,結合剤率,気孔率,硬度,膨潤度等を最適化し
たアルミニウム材用弾性砥石が紹介されている。2. Description of the Related Art Austenitic stainless steels are used as kitchen appliances, decorative steels and the like by utilizing their excellent corrosion resistance and surface properties. When used for applications requiring surface gloss, stainless steel is polished by various polishing methods. In particular, PVA elastic grindstones and resin bond grindstones are used in rough polishing such as flattening and flaw removal of a base material before polishing. In polishing using these whetstones, FIG. 1
The elastic grindstones 1, 1,... Are pressed against the metal plate as the material to be polished while rotating the rotating shaft 3 of the disk 2 in which a plurality of grindstones 1, 1,. I do. Rough polishing with a PVA elastic grindstone requires a large number of man-hours for application in rough polishing because of its low polishing ability. For this reason, the use of a resin-bonded grindstone, which is generally said to have a higher polishing ability than a PVA elastic grindstone, is considered. However, the surface quality (surface roughness) after polishing greatly changes depending on the composition of the grindstone, and the grinding force is increased. It has been found that it is very difficult to obtain a surface roughness corresponding to the particle size, and that the polishing ability also changes greatly. Although it is not a study of the rough polishing ability, various improvements have been made to the grinding wheel polishing in order to improve the flatness, minute displacement, plate thickness accuracy and the like uniformity of the finished surface by the grinding wheel polishing. For example, in JP-A-2-9587,
Elastic stones for aluminum materials with optimized abrasive grain ratio, binder ratio, porosity, hardness, swelling degree, etc. are introduced.
【0003】[0003]
【発明が解決しようとする課題】オーステナイト系ステ
ンレス鋼は、研磨し難い材料であり、通常のPVA弾性
砥石で高い研磨能力を要する粗研磨に適用すると、必要
とする表面状態を得るまでに多数の工程を経る研磨作業
が必要となり、製品の製造コストを上昇させる原因とな
る。このような難研磨性のオーステナイト系ステンレス
鋼を高作業性で研磨するため、PVA弾性砥石の粒度低
下等によって砥石の研磨能力の向上が試みられてきた。
しかし、これらの方法では、研磨能力も十分なものでは
なかった。更に、通常のレジンボンド砥石を用いて研磨
することも試みられていたが、その砥石の特性上、研磨
後の表面粗さが非常に大きくなり、却って後工程におけ
る研磨に多大の工数が必要となる。本発明は、このよう
な問題を解消すべく案出されたものであり、オーステナ
イト系ステンレス鋼の研磨用にレジンボンド砥石の砥粒
率,結合剤率及び気孔率を特定することにより、研磨能
力を大幅に向上させ、通常のレジンボンド砥石の研磨と
比較して研磨後の表面粗さも小さくでき、後工程の負荷
を軽減することが可能なレジンボンド砥石を提供するこ
とを目的とする。Austenitic stainless steel is a material that is difficult to polish, and when applied to rough polishing that requires a high polishing ability with a normal PVA elastic grindstone, a large number of austenitic stainless steels are required until the required surface state is obtained. Polishing work through the process is required, which causes an increase in product manufacturing cost. In order to polish such hard-to-polish austenitic stainless steel with high workability, attempts have been made to improve the polishing ability of the grindstone by reducing the particle size of the PVA elastic grindstone.
However, these methods also have insufficient polishing ability. Furthermore, it has been attempted to polish using a normal resin bond whetstone.However, due to the characteristics of the whetstone, the surface roughness after polishing becomes extremely large, and rather a large number of man-hours are required for polishing in a post-process. Become. The present invention has been devised to solve such a problem, and specifies the abrasive grain ratio, binder ratio, and porosity of a resin-bonded grindstone for polishing austenitic stainless steel, thereby improving the polishing performance. It is an object of the present invention to provide a resin-bonded grindstone capable of significantly reducing the surface roughness after polishing as compared with polishing of a normal resin-bonded grindstone and reducing the load of a post-process.
【0004】[0004]
【課題を解決するための手段】本発明のオーステナイト
系ステンレス鋼研磨用レジンボンド砥石は、その目的を
達成するため、ホワイトアランダムを砥粒として分散さ
せた弾性砥石であり、砥粒率が38〜45体積%,結合
剤率が15〜30体積%,気孔率が35〜45体積%に
調整されていることを特徴とする。砥粒としては、平均
粒径70〜90μmから目標とする表面粗さに応じた粒
度が選ばれ、ホワイトアランダム,グリーンカーボラン
ダム,アランダム等が使用される。結合剤には、熱硬化
性フェノール樹脂,メラミン樹脂等がある。気孔率は、
気孔生成反応物質の投入量によって35〜45体積%の
範囲に定められる。本発明に従って研磨されるオーステ
ナイト系ステンレス鋼としては、Cr:17〜25重量
%,Ni:7〜25重量%を含むステンレス鋼である。
具体的には、SUS304,SUS304L,SUS3
01L,SUS316,SUS317J1,SUS31
6,SUS316L等がある。The resin bond grindstone for polishing austenitic stainless steel of the present invention is an elastic grindstone in which white alundum is dispersed as abrasive grains in order to achieve the object, and has an abrasive grain ratio of 38. 4545% by volume, binder ratio is adjusted to 151530% by volume, and porosity is adjusted to 35〜45% by volume. As the abrasive particles, a particle size according to the target surface roughness is selected from an average particle size of 70 to 90 μm, and white alundum, green carborundum, alundum and the like are used. Examples of the binder include a thermosetting phenol resin and a melamine resin. The porosity is
It is set in the range of 35 to 45% by volume depending on the amount of the pore-forming reactant. The austenitic stainless steel polished according to the present invention is a stainless steel containing 17 to 25% by weight of Cr and 7 to 25% by weight of Ni.
Specifically, SUS304, SUS304L, SUS3
01L, SUS316, SUS317J1, SUS31
6, SUS316L and the like.
【0005】[0005]
【作用】一般に、オーステナイト系ステンレス鋼は、通
常のフェライト系ステンレス鋼に比べ延性が大きく、伸
び(%)で比較してみるとSUS304で59%,フェ
ライト系ステンレス鋼のSUS430で30%である。
すなわち、オーステナイト系ステンレス鋼は、非常にね
ばい特性を呈する。また、オーステナイト系ステンレス
鋼の特徴である高い加工硬化係数は、SUS304で
0.44(1.0t),フェライト系ステンレス鋼で
0.2(1.t )と比較されるように1/2以下であ
り、オーステナイト系ステンレス鋼の加工後の硬化率が
大きいことが判る。このように、加工硬化の大きな被研
磨材に対しては、PVA弾性砥石のような少ない研磨能
力の砥石で多パスを繰り返すことにより、加工硬化の影
響を大きく受けるため、研磨能率を低下させている。更
に、延性が高い特性を持つため、相当の砥粒保持力が必
要とされ、PVA弾性砥石のような結合剤で研磨能力を
維持することはかなり困難である。したがって、強い砥
粒保持力をもつ結合剤をもち粒度番手の小さい(砥粒の
大きい)レジンボンド砥石を用いて数パスで一挙に粗研
磨することが有効と考えられる。このとき、レジンボン
ド砥石の粗研磨で研磨能力を最大にし、表面粗さを最も
小さくする砥石物性を規定することにより、粗研磨能力
を最大限に発揮できる。Generally, austenitic stainless steel has higher ductility than ordinary ferritic stainless steel, and when compared in terms of elongation (%), it is 59% for SUS304 and 30% for SUS430 of ferritic stainless steel.
That is, austenitic stainless steels exhibit very robust properties. Furthermore, as high work hardening coefficient, which is a feature of the austenitic stainless steel, SUS304 in 0.44 (1.0 t), is compared with ferritic stainless steel and 0.2 (1. T) 1/2 It is below, and it turns out that the hardening rate after processing of austenitic stainless steel is large. As described above, for a work material having a large work hardening, by repeatedly performing multiple passes with a grindstone having a small polishing ability such as a PVA elastic grindstone, the work efficiency is greatly affected. I have. In addition, due to its high ductility properties, considerable abrasive retention is required, and it is quite difficult to maintain polishing ability with a binder such as a PVA elastic grinding wheel. Therefore, it is considered effective to carry out rough polishing at once with a few passes using a resin bond grindstone having a binder having a strong abrasive grain holding power and a small grain size (large abrasive grains). At this time, the rough polishing ability of the resin bond grindstone is maximized, and the grinding wheel physical properties for minimizing the surface roughness are specified, whereby the rough polishing ability can be maximized.
【0006】[0006]
【実施の形態】被研磨材として、オーステナイトステン
レス鋼SUS304を使用した。レジンボンド砥石とし
ては、ホワイトアランダムWAの砥粒を熱硬化性フェノ
ール樹脂に分散させた砥石を使用した。そして、カップ
形式で研磨できる直径150mm程度の研磨用治具にレ
ジンボンド砥石を接着した研磨工具を研磨装置に取り付
け、ステンレス鋼を研磨した。目標とする表面うねりの
ない均一面が得られるまで研磨を繰り返し、そのときの
パス回数を求めた。そして、パス回数と砥粒率,結合剤
率及び気孔率との関係を調査したところ、次の通りであ
った。DESCRIPTION OF THE PREFERRED EMBODIMENTS Austenitic stainless steel SUS304 was used as a material to be polished. As the resin bond grindstone, a grindstone in which abrasive grains of White Alundum WA were dispersed in a thermosetting phenol resin was used. Then, a polishing tool in which a resin bond grindstone was adhered to a polishing jig having a diameter of about 150 mm that can be polished in a cup form was attached to a polishing apparatus, and stainless steel was polished. Polishing was repeated until a target uniform surface without surface waviness was obtained, and the number of passes at that time was determined. The relationship between the number of passes and the abrasive grain ratio, binder ratio, and porosity was investigated.
【0007】砥石の研磨能力は、図2に示すように砥粒
率が増加するほど向上している。結合剤率及び気孔率
は、図3及び図4にそれぞれ示すように、ある範囲で研
磨能力の向上に有効である。このような研磨能力に影響
する個々の物性について、種々調査検討を重ねた結果、
砥粒率25〜33体積%,結合剤率17〜28体積%,
気孔率45〜54体積%の範囲が有効であることを解明
した。砥粒率については、おおむね砥粒が多いほど、す
なわち砥粒率が高いほど研磨に寄与する作用砥粒数が多
くなるため、研磨能力が高いと考えられる。しかし、結
合剤とのバランスが崩れれば、脱落する砥粒が多くな
り、固定砥粒による有効な研磨ができなくなるが、オー
ステナイト系ステンレス鋼であるSUS304のように
延性があり、加工硬化も大きい被研磨材では、遊離砥粒
による研磨も有効と考えられる。As shown in FIG. 2, the polishing ability of the grindstone increases as the abrasive grain ratio increases. As shown in FIGS. 3 and 4, the binder ratio and the porosity are effective in improving the polishing ability in a certain range. As a result of repeated investigations and studies on individual physical properties that affect such polishing ability,
Abrasive grain ratio 25-33% by volume, binder ratio 17-28% by volume,
It has been found that a range of porosity of 45 to 54% by volume is effective. Regarding the abrasive grain ratio, it is considered that the polishing ability is generally higher as the number of abrasive grains increases, that is, as the abrasive grain rate increases, the number of working abrasive grains that contribute to polishing increases. However, if the balance with the binder is lost, the number of abrasive grains that fall off increases, making it impossible to perform effective polishing with fixed abrasive grains. However, there is ductility like SUS304, which is an austenitic stainless steel, and work hardening is large. For the material to be polished, polishing with free abrasive grains is also considered to be effective.
【0008】結合剤は、このようにこれらの砥粒を保持
する結合剤も把握力が強いものを選択すべきであるが、
把握力を最大に保つその比率は1個の砥粒の全面を覆う
ことができる比率となる。結合剤の増量に応じて砥粒把
握力が安定してくるが、ある範囲を超えると表面品質の
悪化を招く。したがって、適正且つ最大の研磨能力を引
出す結合剤率が存在すると考えられる。更に、オーステ
ナイト系ステンレス鋼であるSUS304のように延性
のある被研磨材は、目詰りが起こり易く、切り屑の排出
機能をもつチップポケット(気孔)を多くもつ必要があ
る。[0008] As for the binder, the binder holding these abrasive grains should be selected from those having a strong grasping power.
The ratio that keeps the gripping force at a maximum is a ratio that can cover the entire surface of one abrasive grain. The abrasive grain grasping power is stabilized in accordance with the increase in the amount of the binder, but if it exceeds a certain range, the surface quality is deteriorated. Therefore, it is considered that there is a binder ratio that brings out a proper and maximum polishing ability. Further, a material to be polished such as SUS304, which is an austenitic stainless steel, is liable to be clogged and needs to have many chip pockets (pores) having a function of discharging chips.
【0009】このように、通常のオーステナイト系ステ
ンレス鋼の研磨に適用されているレジンボンド砥石で砥
石3要素、すなわち砥粒率,結合剤率,気孔率を最適な
比率に設定することにより、更に高能率で高品質に研磨
することが可能となる。この組成比率の最適化により、
砥粒率,結合剤率及び気孔率が前述した範囲にあると
き、5パス以内の研磨でうねりのない均一な研磨面が現
れ、従来に比較して研磨能力を30%以上向上させ、表
面粗さも極小値にすることが可能となる。その結果、難
研磨材であるオーステナイト系ステンレス鋼であって
も、少ないパス回数で良好な表面状態に研磨される。前
述したような各比率の数値限定の観点からみてみると、
通常のレジンボンド砥石に比べ砥粒率がかなり多く、結
合剤率及び気孔率は砥粒率に適応した比率にすべきであ
ることが判るが、本発明で粗研磨に適用した粒度では、
チップポケット(気孔)を多くもつ必要がなく、砥粒率
と結合剤率で決定されればよい。[0009] As described above, by setting the three elements of the grinding wheel, that is, the abrasive grain ratio, the binder ratio, and the porosity to the optimum ratio, with a resin-bonded grinding wheel applied to the polishing of normal austenitic stainless steel, High efficiency and high quality polishing can be achieved. By optimizing this composition ratio,
When the abrasive grain ratio, binder ratio, and porosity are within the ranges described above, a uniform polished surface without undulation appears by polishing within 5 passes, and the polishing ability is improved by 30% or more as compared with the conventional, and the surface roughness is improved. It is also possible to minimize the value. As a result, even austenitic stainless steel, which is a hard-to-polish material, can be polished to a good surface state with a small number of passes. From the viewpoint of limiting the numerical value of each ratio as described above,
Abrasive grain ratio is considerably higher than ordinary resin bond whetstone, it is understood that the binder ratio and porosity should be a ratio adapted to the abrasive ratio, but with the particle size applied to rough polishing in the present invention,
It is not necessary to have many chip pockets (pores), and it may be determined by the abrasive grain ratio and the binder ratio.
【0010】[0010]
【実施例】表1に示した粒度#220のレジンボンド砥
石を使用して、オーステナイト系ステンレス鋼SUS3
04製で幅40mm,高さ18mm,肉厚1.5mm,
長さ200mmの角管を研磨した。この角管は、すべて
平坦度50μm程度のものを周種津して試験サンプルと
した。研磨条件には、砥石回転数500〜100rp
m,送り速度1000〜2000mm/分,圧下量0.
5mm/パスを採用した。未研磨部がなく、均一な研磨
面(平坦化が完了した研磨面)となるまで研磨を繰り返
し、そのパス回数をカウントした。調査結果を、砥石物
性と比較して表1に併せ示す。EXAMPLE Austenitic stainless steel SUS3 was used using a resin-bonded grindstone of particle size # 220 shown in Table 1.
Made of 04, width 40mm, height 18mm, wall thickness 1.5mm,
A 200 mm long square tube was polished. All the square tubes having a flatness of about 50 μm were used as test samples. The polishing conditions include a grindstone rotation speed of 500-100 rpm.
m, feed rate 1000-2000 mm / min, reduction amount 0.
5 mm / pass was adopted. Polishing was repeated until there was no unpolished portion and a uniform polished surface (a polished surface where planarization was completed), and the number of passes was counted. The inspection results are shown in Table 1 in comparison with the wheel properties.
【0011】 [0011]
【0012】表1から明らかなように、砥粒率,研磨剤
率及び気孔率が本発明で規定した範囲にあるレジンボン
ド砥石を使用した試験番号1〜5の研磨では、何れも5
パス以下の研磨で表面欠陥のない状態に粗研磨された。
他方、砥粒率,研磨剤率及び気孔率の何れかが本発明で
規定した範囲を満足しない試験番号6〜8の研磨では、
パス回数が多く、良好な表面状態に研磨するための工数
が多いことが判る。研磨後の表面粗さをみても、本発明
に従った試験番号1〜5の研磨では、表面粗さRmax の
平均で0.88μm,比較例・試験番号6〜7の研磨で
は平均1.13μmであった。すなわち、砥粒率,研磨
剤率及び気孔率を適正に維持することにより、適正な研
磨が行われ、表面粗さが小さく品質の良い研磨面が得ら
れることが判る。このように、本発明に従ったレジンボ
ンド砥石を使用すると、従来の30%以上の工数減で表
面粗さも悪化させることなく安定した研磨品質が得られ
た。As is clear from Table 1, in the polishing of Test Nos. 1 to 5 using a resin-bonded grindstone having an abrasive grain ratio, an abrasive ratio and a porosity within the ranges specified in the present invention, all of them were 5%.
The surface was roughly polished to a state free from surface defects by polishing below the pass.
On the other hand, in polishing of Test Nos. 6 to 8 in which any of the abrasive grain ratio, the abrasive ratio and the porosity do not satisfy the range specified in the present invention,
It can be seen that the number of passes is large and the number of steps for polishing to a good surface state is large. Looking at the surface roughness after polishing, the polishing of Test No. 1-5 in accordance with the present invention, 0.88 .mu.m in average surface roughness R max, average polishing of Comparative Examples and Test No. 6-7 1. 13 μm. That is, it can be seen that by maintaining the abrasive grain ratio, the abrasive ratio, and the porosity appropriately, appropriate polishing is performed, and a high-quality polished surface with small surface roughness is obtained. As described above, when the resin-bonded grindstone according to the present invention was used, a stable polishing quality was obtained without reducing the man-hours by 30% or more of the prior art and without deteriorating the surface roughness.
【0013】[0013]
【発明の効果】以上に説明したように、本発明のレジン
ボンド砥石は、難研磨材であるオーステナイト系ステン
レス鋼に対応して砥粒率,結合剤率及び気孔率を特定し
ている。この特定された条件によって、少ないパス回数
で良好な表面状態に研磨仕上げすることが可能となる。
また、パス回数の多い従来の研磨法と比較して、何ら遜
色のない表面粗さをもつ高品質の研磨面が得られる。As described above, in the resin-bonded grindstone of the present invention, the abrasive grain ratio, the binder ratio, and the porosity are specified corresponding to the austenitic stainless steel which is a hard-to-polish material. Under the specified conditions, it is possible to perform polishing and finishing to a good surface state with a small number of passes.
In addition, a high-quality polished surface having a surface roughness comparable to that of the conventional polishing method having a large number of passes can be obtained.
【図1】 レジンボンド砥石を使用した研磨工具の平面
図(a)及び側断面図(b)FIG. 1 is a plan view (a) and a side sectional view (b) of a polishing tool using a resin-bonded grindstone.
【図2】 パス回数(研磨能力)に及ぼす砥粒率の影響
を示したグラフFIG. 2 is a graph showing the effect of the abrasive grain ratio on the number of passes (polishing ability).
【図3】 パス回数(研磨能力)に及ぼす結合剤率の影
響を示したグラフFIG. 3 is a graph showing the effect of the binder ratio on the number of passes (polishing ability).
【図4】 パス回数(研磨能力)に及ぼす気孔率の影響
を示したグラフFIG. 4 is a graph showing the effect of porosity on the number of passes (polishing ability).
1:レジンボンド 2:ディスク 3:回転軸 1: Resin bond 2: Disk 3: Rotation axis
Claims (1)
せたレジンボンド砥石であり、砥粒率が38〜45体積
%,結合剤率が22〜35体積%,気孔率が32〜45
体積%に調整されているオーステナイト系ステンレス鋼
研磨用砥石。1. A resin-bonded grindstone in which white alundum is dispersed as abrasive grains, the abrasive rate is 38 to 45% by volume, the binder rate is 22 to 35% by volume, and the porosity is 32 to 45%.
Abrasive stone for austenitic stainless steel adjusted to volume%.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27306696A JPH1094969A (en) | 1996-09-24 | 1996-09-24 | Grinding wheel for polishing austenite stainless steel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27306696A JPH1094969A (en) | 1996-09-24 | 1996-09-24 | Grinding wheel for polishing austenite stainless steel |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH1094969A true JPH1094969A (en) | 1998-04-14 |
Family
ID=17522680
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP27306696A Withdrawn JPH1094969A (en) | 1996-09-24 | 1996-09-24 | Grinding wheel for polishing austenite stainless steel |
Country Status (1)
Country | Link |
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JP (1) | JPH1094969A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005522337A (en) * | 2002-04-11 | 2005-07-28 | サンーゴバン アブレイシブズ,インコーポレイティド | Roll grinding method |
-
1996
- 1996-09-24 JP JP27306696A patent/JPH1094969A/en not_active Withdrawn
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005522337A (en) * | 2002-04-11 | 2005-07-28 | サンーゴバン アブレイシブズ,インコーポレイティド | Roll grinding method |
JP2008100349A (en) * | 2002-04-11 | 2008-05-01 | Saint-Gobain Abrasives Inc | Grinding method for roll |
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