JPH04122576A - Manufacture of diamond grinding wheel - Google Patents
Manufacture of diamond grinding wheelInfo
- Publication number
- JPH04122576A JPH04122576A JP23724090A JP23724090A JPH04122576A JP H04122576 A JPH04122576 A JP H04122576A JP 23724090 A JP23724090 A JP 23724090A JP 23724090 A JP23724090 A JP 23724090A JP H04122576 A JPH04122576 A JP H04122576A
- Authority
- JP
- Japan
- Prior art keywords
- diamond
- diamond abrasive
- grinding wheel
- abrasive grains
- temperature
- 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.)
- Granted
Links
- 229910003460 diamond Inorganic materials 0.000 title claims abstract description 53
- 239000010432 diamond Substances 0.000 title claims abstract description 53
- 238000000227 grinding Methods 0.000 title claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 239000006061 abrasive grain Substances 0.000 claims abstract description 42
- 239000000843 powder Substances 0.000 claims abstract description 13
- 239000011230 binding agent Substances 0.000 claims description 18
- 238000010304 firing Methods 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 5
- 239000007767 bonding agent Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 5
- 239000011248 coating agent Substances 0.000 abstract description 4
- 238000000576 coating method Methods 0.000 abstract description 4
- 230000003647 oxidation Effects 0.000 abstract description 4
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 238000000465 moulding Methods 0.000 abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 2
- 230000004888 barrier function Effects 0.000 abstract description 2
- 229910052760 oxygen Inorganic materials 0.000 abstract description 2
- 239000001301 oxygen Substances 0.000 abstract description 2
- 239000011521 glass Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 3
- 230000002542 deteriorative effect Effects 0.000 description 2
- 238000007416 differential thermogravimetric analysis Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000006060 molten glass Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000001757 thermogravimetry curve Methods 0.000 description 1
Landscapes
- Polishing Bodies And Polishing Tools (AREA)
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、ダイヤモンド砥石の製造方法に関する。[Detailed description of the invention] (Industrial application field) The present invention relates to a method for manufacturing a diamond grindstone.
（従来の技術）
従来、特公昭５Ｂ−４１３９１号公報により、ダイヤモ
ンド砥粒に軟化点が６５０℃以下のガラス質結合剤の粉
末を混合して成形した後、これを大気雰囲気中で６５０
℃以下の温度で焼成するようにしたダイヤモンド砥石の
製造方法は知られている。(Prior Art) Conventionally, according to Japanese Patent Publication No. 5B-41391, diamond abrasive grains are mixed with powder of a vitreous binder having a softening point of 650° C. or lower, and then molded, and then heated at 650° C. in an air atmosphere.
A method for producing a diamond grindstone that is fired at a temperature of 0.degree. C. or lower is known.
（発明が解決しようとする課題）
ダイヤモンドは、大気雰囲気中で加熱すると、７００〜
８００℃で焼失するが、６５０℃で既に酸化し始めて劣
化する。そのため、上記従来技術では、軟化点６５０℃
以下のガラス質結合剤を用い、６５０℃以下の温度で焼
成を行っている。(Problem to be solved by the invention) When diamond is heated in the air, it has a
It burns out at 800°C, but begins to oxidize and deteriorate at 650°C. Therefore, in the above conventional technology, the softening point is 650°C.
The following vitreous binder was used and firing was performed at a temperature of 650° C. or lower.
然し、焼成温度が６５０℃以下では、軟化点６５０℃以
下の結合剤を用いても砥石内部の結合剤が充分に溶融せ
ず、被研削材によっては砥粒の結合強度が不足するため
、６５０℃より高温で焼成することを要求される場合が
ある。この場合、従来は、ダイヤモンドの劣化を防止す
るために不活性雰囲気中で焼成を行っているが、これで
は不活性雰囲気を作る特別の設備が必要となってコスト
が高くなるため、大気雰囲気中で６５０℃より高温の焼
成を行い得られるようにすることが望まれている。However, if the firing temperature is below 650°C, even if a binder with a softening point of below 650°C is used, the bonding agent inside the grinding wheel will not be sufficiently melted, and depending on the material to be ground, the bonding strength of the abrasive grains will be insufficient. Firing at temperatures higher than ℃ may be required. In this case, conventionally, the diamond is fired in an inert atmosphere to prevent it from deteriorating, but this requires special equipment to create an inert atmosphere, which increases costs. It is desired to be able to obtain the same by firing at a temperature higher than 650°C.
そこで、本願発明者は、大気雰囲気中での６５０℃より
高温の焼成は不可とする従来の技術常識に囚われず種々
の実験を行った結果、軟化点６５０℃以下のガラス質結
合剤を用いれば、大気雰囲気中で６５０℃より高温で焼
成してもダイヤモンド砥粒の酸化を生じないことを知見
するに至った。Therefore, the inventor of the present application has conducted various experiments without being bound by the conventional technical knowledge that firing at a temperature higher than 650°C in an air atmosphere is not possible, and has found that it is possible to use a vitreous binder with a softening point of 650°C or lower. It was discovered that diamond abrasive grains do not oxidize even when fired at a temperature higher than 650° C. in an air atmosphere.
本発明は、かかる知見に基いて成されたものであり大気
雰囲気中での焼成によってダイヤモンド砥粒を劣化させ
ることなく結合強度を高められるようにした、ダイヤモ
ンド砥石の製造方法を提供することをその目的としてい
る。The present invention has been made based on this knowledge, and an object of the present invention is to provide a method for manufacturing a diamond grinding wheel that can increase the bonding strength without deteriorating the diamond abrasive grains by firing in an atmospheric atmosphere. The purpose is
（課題を解決するための手段）
上記目的を達成すべく、本発明では、ダイヤモンド砥粒
に軟化点が６５０℃以下のガラス質結合剤の粉末を混合
して成形した後、大気雰囲気中で焼成してダイヤモンド
砥石を製造する方法において、焼成時に温度が６５０℃
以上になる前に砥石表面のダイヤモンド砥粒が溶融した
ガラス質結合剤で被覆されるようにし、その後６５０℃
より高温で焼成するようにした。(Means for Solving the Problems) In order to achieve the above object, in the present invention, diamond abrasive grains are mixed with a powder of a vitreous binder having a softening point of 650°C or less, and then molded and then fired in an atmospheric atmosphere. In the method for manufacturing diamond grindstones, the temperature during firing is 650°C.
The diamond abrasive grains on the surface of the grinding wheel are coated with molten glass bonding agent before heating to 655°C.
Fired at a higher temperature.
（作 用）
６５０℃以上になる前にダイヤモンド砥粒が溶融したガ
ラス質結合剤で被覆されるため、この結合剤がダイヤモ
ンド砥粒に対する酸素バリヤ被膜となって、以後大気雰
囲気中で６５０℃より高温で焼成してもダイヤモンド砥
粒の酸化は生じず、この高温での焼成により結合強度の
高いダイヤモンド砥石が得られる。(Function) Since the diamond abrasive grains are coated with a molten glassy binder before the temperature reaches 650°C or higher, this binder acts as an oxygen barrier film for the diamond abrasive grains, and from then on the diamond abrasive grains become coated with a molten glassy binder before the temperature reaches 650°C or higher. Even when fired at a high temperature, the diamond abrasive grains do not oxidize, and by firing at this high temperature, a diamond whetstone with high bond strength can be obtained.
（実施例）
第１図は、ダイヤモンド砥粒１とガラス質結合剤の粉末
２とを混合して成形した状態を示し、これを焼成すると
結合剤粉末が溶融して、第２図に示す如くダイヤモンド
砥粒１を被覆する結合剤から成る被膜３が形成される。(Example) Figure 1 shows a state in which diamond abrasive grains 1 and vitreous binder powder 2 are mixed and molded, and when this is fired, the binder powder melts, resulting in a shape as shown in Figure 2. A coating 3 made of a bonding agent is formed which coats the diamond abrasive grains 1.
そして、ダイヤモンドが劣化し始める ６５０℃になる
前にこの被膜３が形成されるよう、ガラス質結合剤は軟
化点６５０℃以下のものを用いる。In order to form the coating 3 before the temperature reaches 650°C, at which point the diamond begins to deteriorate, a glassy binder with a softening point of 650°C or lower is used.
これによれば、大気雰囲気中で６５０℃より高温で焼成
しても、ダイヤモンド砥粒１の酸化は生しない。尚、焼
成温度の最高温は、ダイヤモンドの炭化開始温度たる約
９００℃以下とする。According to this, oxidation of the diamond abrasive grains 1 does not occur even if the diamond abrasive grains 1 are fired at a temperature higher than 650° C. in an air atmosphere. Note that the maximum firing temperature is approximately 900° C. or lower, which is the carbonization starting temperature of diamond.
ガラス質結合剤として、ガラス転移点的５６０℃、軟化
点的６３５℃、結晶化温度的７１０℃のＰｂＯＢ２０３
ＺｎＯ系の結晶化ガラスの粉末（以下ガラス粉末と
記す）を用い、ダイヤモンド砥粒と、ダイヤモンド砥粒
とガラス粉末を６：４の重量割合で混合した混合物とに
ついて、焼結アルミナ（α〜Ａ１２０ｉ）を標準物質と
して大気雰囲気中で５℃／分の昇温速度で示差熱重量分
析を行ったところ、ダイヤモンド砥粒については第３図
、混合物については第４図に示す測定結果が得られた。As a vitreous binder, PbOB203 has a glass transition point of 560°C, a softening point of 635°C, and a crystallization temperature of 710°C.
Using ZnO-based crystallized glass powder (hereinafter referred to as glass powder), diamond abrasive grains and a mixture of diamond abrasive grains and glass powder in a weight ratio of 6:4 were used. ) was used as a standard substance and differential thermogravimetric analysis was performed in the air at a heating rate of 5°C/min, and the measurement results shown in Figure 3 for the diamond abrasive grains and Figure 4 for the mixture were obtained. .
尚、ＴＧＡ曲線は熱重量変化、ＤＴＡ曲線は示差熱変化
を示す。Note that the TGA curve shows thermogravimetric changes, and the DTA curve shows differential thermal changes.
第３図から明らかなように、ダイヤモンド砥粒単独では
約６５０℃で酸化し始めて、約８００℃で完全に焼失し
たが、混合物では、第４図に示すように、約９００℃に
加熱しても重量は変化せず、ダイヤモンド砥粒の酸化を
生じないことが判明した。As is clear from Figure 3, diamond abrasive grains alone begin to oxidize at about 650°C and are completely burnt out at about 800°C, but as shown in Figure 4, diamond abrasive grains begin to oxidize at about 800°C, but as shown in Figure 4, diamond abrasive grains start to oxidize at about 800°C. It was also found that the weight did not change and the diamond abrasive grains did not oxidize.
ところで、砥粒を球形とした場合、砥粒か内接する立方
体の一辺の長さをｄとして、砥粒の体積■は、
■−−πｄ３； ｄ３
となって、立方体の体積の約５０％となる。そして、砥
石中の砥粒の割合が５０容量％以上になると焼成しにく
くなり、５０容量％が砥石中の砥粒め割合の最大値にな
る。By the way, if the abrasive grain is spherical, and the length of one side of the cube inscribed with the abrasive grain is d, the volume of the abrasive grain is: ■--πd3; d3, which is about 50% of the volume of the cube. Become. When the proportion of abrasive grains in the whetstone exceeds 50% by volume, firing becomes difficult, and 50% by volume becomes the maximum value of the proportion of abrasive grains in the whetstone.
上記の分析に用いた混合物を成形した後、大気雰囲気中
で７００℃で焼成すると、砥粒約５０容量％、結合剤約
２０容量％、気孔約３０容量％の砥石が得られ、結局砥
粒の割合が最大となる混合割合でダイヤモンド砥粒とガ
ラス粉末とを混合したものを大気雰囲気中で６５０℃よ
り高温で焼成しても、ダイヤモンド砥粒の酸化を生じな
いことが実験的に確認されたことになり、砥粒の割合を
それより少なくした通常のダイヤモンド砥石は同様の条
件で良好に焼成できることが分る。After molding the mixture used in the above analysis, when it is fired at 700°C in the air, a grindstone containing about 50% by volume of abrasive grains, about 20% by volume of binder, and about 30% by volume of pores is obtained. It has been experimentally confirmed that oxidation of the diamond abrasive grains does not occur even if a mixture of diamond abrasive grains and glass powder is fired at a temperature higher than 650°C in an air atmosphere at a mixing ratio that maximizes the ratio of This shows that a normal diamond grindstone with a lower proportion of abrasive grains can be fired under similar conditions.
尚、昇温及び冷却時の熱膨脹差による応力発生を防止す
るため、ガラス質結合剤としてダイヤモンドとの熱膨脹
率の差が±２ Ｘ １０−６／”Ｃ以内のものを用いる
ことが望ましい。In order to prevent the generation of stress due to the difference in thermal expansion during heating and cooling, it is desirable to use a vitreous binder that has a coefficient of thermal expansion within ±2 x 10-6/''C with respect to diamond.
（発明の効果）
以上の説明から明らかなように、本発明によれば、ダイ
ヤモンド砥粒の酸化を生ずることなく、大気雰囲気中で
６５０℃より高温でダイヤモンド砥石を焼成でき、結合
強度の高いダイヤモンド砥石を低コストで製造できる効
果がある。(Effects of the Invention) As is clear from the above explanation, according to the present invention, a diamond grinding wheel can be fired at a temperature higher than 650°C in an air atmosphere without causing oxidation of diamond abrasive grains, and a diamond grinding wheel with high bonding strength can be fired. This has the effect of allowing grindstones to be manufactured at low cost.
第１図は本発明方法のダイヤモンド砥粒とガラス質結合
剤粉末の混合物の成形時の模式的な断面図、第２図はそ
の焼成時の模式的な断面図、第３図及び第４図は夫々ダ
イヤモンド砥粒及びダイヤモンド砥粒とガラス粉末の混
合物との示差熱重量分析結果を示す線図である。
１・・・ダイヤモンド砥粒
２・・・ガラス質結合剤粉末
３・・・結合剤の溶融被膜
外３名Fig. 1 is a schematic cross-sectional view of a mixture of diamond abrasive grains and vitreous binder powder obtained by the method of the present invention during molding, Fig. 2 is a schematic cross-sectional view of the mixture during firing, and Figs. 3 and 4. 2A and 2B are diagrams showing differential thermogravimetric analysis results of diamond abrasive grains and a mixture of diamond abrasive grains and glass powder, respectively. 1... Diamond abrasive grains 2... Glassy binder powder 3... 3 people outside the molten coating of the binder
Claims (1)
合剤の粉末を混合して成形した後、大気雰囲気中で焼成
してダイヤモンド砥石を製造する方法において、焼成時
に温度が６５０℃以上になる前にダイヤモンド砥粒が溶
融したガラス質結合剤で被覆されるようにし、その後６
５０℃より高温で焼成することを特徴とするダイヤモン
ド砥石の製造方法。In a method of manufacturing a diamond grinding wheel by mixing diamond abrasive grains with powder of a vitreous binder with a softening point of 650°C or lower and then firing the mixture in an atmospheric atmosphere, before the temperature reaches 650°C or higher during firing. The diamond abrasive grains are then coated with molten vitreous bonding agent, and then 6
A method for manufacturing a diamond whetstone, characterized by firing at a temperature higher than 50°C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2237240A JPH0818254B2 (en) | 1990-09-10 | 1990-09-10 | Diamond grindstone manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2237240A JPH0818254B2 (en) | 1990-09-10 | 1990-09-10 | Diamond grindstone manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04122576A true JPH04122576A (en) | 1992-04-23 |
| JPH0818254B2 JPH0818254B2 (en) | 1996-02-28 |
Family
ID=17012469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2237240A Expired - Fee Related JPH0818254B2 (en) | 1990-09-10 | 1990-09-10 | Diamond grindstone manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0818254B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020024741A (en) * | 2000-09-26 | 2002-04-01 | 김세광 | Method for Manufacturing a grinding Wheel and the tips thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103770035B (en) * | 2014-02-25 | 2016-08-17 | 武汉理工大学 | A kind of preparation method of sintering temperature and low high strength diamond wheel ceramic bonding agent |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5641391A (en) * | 1979-09-13 | 1981-04-18 | Kasatani Hatsujo Kk | Automatic continuous alkali cleaning device |
| JPS62152677A (en) * | 1985-12-25 | 1987-07-07 | Toshiba Tungaloy Co Ltd | Manufacture of grindstone |
| JPS62292365A (en) * | 1986-06-11 | 1987-12-19 | Mizuho Kenma Toishi Kk | Ceramic carbide abrasive grain grindstone and its process |
| JPS6316973A (en) * | 1986-07-10 | 1988-01-23 | Hitachi Ltd | Grinding wheel |
-
1990
- 1990-09-10 JP JP2237240A patent/JPH0818254B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5641391A (en) * | 1979-09-13 | 1981-04-18 | Kasatani Hatsujo Kk | Automatic continuous alkali cleaning device |
| JPS62152677A (en) * | 1985-12-25 | 1987-07-07 | Toshiba Tungaloy Co Ltd | Manufacture of grindstone |
| JPS62292365A (en) * | 1986-06-11 | 1987-12-19 | Mizuho Kenma Toishi Kk | Ceramic carbide abrasive grain grindstone and its process |
| JPS6316973A (en) * | 1986-07-10 | 1988-01-23 | Hitachi Ltd | Grinding wheel |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020024741A (en) * | 2000-09-26 | 2002-04-01 | 김세광 | Method for Manufacturing a grinding Wheel and the tips thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0818254B2 (en) | 1996-02-28 |
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