CA1089234A - Laminated rotary grinder - Google Patents
Laminated rotary grinderInfo
- Publication number
- CA1089234A CA1089234A CA305,657A CA305657A CA1089234A CA 1089234 A CA1089234 A CA 1089234A CA 305657 A CA305657 A CA 305657A CA 1089234 A CA1089234 A CA 1089234A
- Authority
- CA
- Canada
- Prior art keywords
- grindstone
- grinder
- discs
- particles
- inorganic particles
- 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.)
- Expired
Links
Landscapes
- Polishing Bodies And Polishing Tools (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The present invention is a laminated rotary grinder which has an adhesive layer of a mixture containing phenol resin and the like and inorganic particles having uniform and maximum diameters. This is to allow provision of a space of a predetermined width between the discs. The adhesive layer may cover the entire area or a part of the area extending from the inner circumference and the outer circumference.
The present invention is a laminated rotary grinder which has an adhesive layer of a mixture containing phenol resin and the like and inorganic particles having uniform and maximum diameters. This is to allow provision of a space of a predetermined width between the discs. The adhesive layer may cover the entire area or a part of the area extending from the inner circumference and the outer circumference.
Description
`~ ~089Z3~
1 The present invention relates to improvements of rotary grinder for grinding metals, fire resistant bricks, stones and the like, and more particularly it aims to provide a rotary grinder which has a higher efficiency and generates less heat.
. It is known that a laminated rota:ry grinder comprising thin grindstone discs laminated together with a suitable space between each disc is superior to a rotary grinder comprising one thick grindstone. It is also disclosed in th.e applicant's Japanese Patent Publication No. ~0,091-78 which. was published August 8,1g78 that the space between each grindstone disc can be formed by coating the surface of the grindstone with a mixture of an adhesive and grinding particles or sand and the like of uniform diameter equivalent to the predetermined width of the space prior to laminating the grindstone cllscs în an a~ial direction ~o.r successive compxe~sion and f.iring. ~n this case, th~
adhesive layer is formed mainly for the purpose of providing a boss member of the grindstone disc and leaving the area of the outer circumference as an empty space.
As a result of successive studies, it has been found that a number of pores are formed even if the grindstone discs are bonded by coating the mixture of adhesive and grinding particles over the entire surface of the discs, although the grinder retains suficient strength against mechanical impact.
It has also been discovered that the grinding particles in the adhesive layer selectively fall off during the grinding operation, which contributes to an increase in grinding efficiency. These are improvements over the art as presently known and as noted in the preceeding paragraphs.
It is therefore an object of the present invention to provide a laminated grinder which incorporates these improve-ments.
. ...
J
-^ 10~39Z34 1 The laminated rotary grinder in accordance with the present invention has an adhesive layer of a mixture containing phenol resin and the like and inorganic particles having uniform and maximum diameter such as provides a space of a predetermined width between the discs, the adhesive layer covering the entire area or a part of the area extending from the inner circumference and the outer circumference.
Further objects and advantages of the invention will appear from the following description taken together with the accompanying drawings in which:
Figs. la through ld are plane views illustrating various ways of spreading an adhesive containing inorganic particles onto the surface of the thin grindstone disc.
Fig. 2 is a side view of a laminated rotary grinder.
Fig. 3 is an enlarged partial view of a laminated rotary grinder.
The present invention is applicable to an ordinary rotary grinder comprising two to ten grindstones laminated and each grindstone having the thickness T of between 1-10 mm, the 20 diameter D of between 50-1000 mm. It is particularly suitable for laminated grindstones of medium and large size such as D=150-200 and D,500-700 mm respectively when they are used ~or grinding aluminum, aluminum alloys and the like as the powdery dust from grinding adheres less to the outer circum-ference of the grindstone.
The space S between the laminated thin grindstone discs is normally in the range of 0.05-10 mm, and is preferably smaller than the thickness T of the grindstone. It is desirable that the space is narrow when the material to be ground is a metal and wider for brittle materials such as fire .
' , ' . , .
?89Z3~L
t resistant bricks and stones. The optimum width of the space ~or metals is S=0.1-1 mm. Such adjustment of the space S can be regulated by selecting inorganic particles whose maximum diameter corresponds with the desired space. The inorganic particles are mixed with an adhesive such as phenol resin, which is coated or spread over the thin grindstone disc to orm one layer. The grindstone thus treated is laminated with another grindstone and slid together under pressure before firing and molding into one grinder.
Although it is most convenient to use the grinding particles as said particle member mixed with an adhesive, particles obtained by pulverizing ordinary orogenic minerals such as quartz, feldspar, mica, magnetite, pyroxene, amphibole and the like in ~arying siæes, i.e., coarse ~2-0.5 ~Im)~ medium (0.5-0.25) and fine (0.25-0.01). In addition, natural or artificial pumice particles may also be used. Such pumice particles as "shirasu" which are obtained by firing and granulating "shirasu-balloon" are desirable because they are capable of retaining grinding liquid such as paraffin wax and grinding oil.
The adhesive mixture o inorganic particles and phenol resin is prepared by first mixing inorganic particles such as grinding particles with phenol resin in powder form and then adding liquid phenol resin to the irst mixture as a spreadin~
agent. Examples of various compositions are shown in Table 1.
The values in the table are expressed in weight parts.
Compositions 30 Grindstone particles 5 6 7 Powdered phenol resin 4 3 2 Liquid phenol resin 1 The particles containing adhesive is coated or spread on the disc surface. The inorganic particles 2 may be spread over the entire surface of the grindstone disc 1 as in Fig. la. It is also possible as in Fig. lb to spread the inorganic particles 2 radially extending from the inner circum-ference 3 to the outer circumference 4. It is still possible to spread the inorganic particles in a ring like formation as shown in Fig. lc as well as in combination of radial and ring for-mations such as shown in Fig. ld.
Another useful way to apply the particle containing adhesive to the disc is to place the particles containing adhesive in spots over the entire surface area of the disc. The inorganic particles are spread over the grindstone disc covering 30-100% of the surface area. Two or more grindstones are ground to each other creating a space e~uivalent to the diameter of the ~rinding particles, and then the discs are compressed under a pressure lower than the molding pressure and fired for two to five hours at a temperature between 120 and 200C.
One example of this laminated rotary grinder is shown -20 in Fig. 2; Fig. 3 is a partial enlarged view of Fig. 1. The ~
space between the thin grindstone discs 1 is formed due to ;
the shrinkage of the adhesive resin during firing of the discs and it i5 porous and mechanically weak. ~s seen in Fig. 3, the inorganic particles 2 help keep a space o~ predetermined width while providing numerous pores in this adhesive layer. So long as the inorganic particles having the maximum diameter are present in high density, presence of smaller particles 6 causes no problem, which is shown ïn Fig. 3 at the right hand side.
Reference numeral 7 denotes an object to be ground such as aluminum alloys-.. , . . , ~ , . . ...
,. . . ~ , , , . , :
.
~ 0~3,'~
1 In a laminated rotary grinder which is fabricated in accordance with the present invention to have the structure mentioned above, the space be-tween the grindstone discs can be made uniform and balanced in width even with larger grindstones having a diameter as large as 500 mm and more. Moreover, the presence of the inorganic particles in the space between the discs not only creates pores within the adhesive layer but also provides sufficient strength of adhesion. The grindstones are thus not easily dislocated by an ordinary mechanical impact.
The inorganic particles, however, come off first during grinding operation, which contributes to increase the efficiency.
Grinding efficiency is also increased if paraffin wax and the like is filled in said pores, which retain the paraffin during the operation.
Table 2 shows results of a grinding test using a lamlna~ed rotar~ grinder wherein the diameter oE the grindstone D is 150 mm, the thickness T is 4 mm and the space S is 0.1 mm, and a conventional commercial flat resinoid grindstone (150 x ;~
25 mm) as a comparative. The materials used are aluminum alloys and stainless steel. The grinding efficiency is determined by the amount of grinding achieved per minute at a circumferential rate of 1630 m/min. and under a load of 10 kg. The adhesive agent, prepared according to the composition 1 of Table 1 using 0.1 mm grindstone particles, is evenly spread over approximately 70% of the surface of the A-24-150-4 discs.
1~8~2~4 i 1 TABLE_2 Grindstone Aluminum Alloys Stainless Steel Grindstone Efficiency amt. of Efficiency amt. of particle A-24 g/min. wear g/min. g/min. wear g/min.
Embodiment 1 150mmx4mmx6 discs 6.7 3.0 7.3 1.8 (S=0.1 mm) Embodiment 2 Same as Emb.l 11.2 1.9 8.5 2.1 treated w/paraffin Comparative 150x25xl disc 2.1 1.5 3.4 0.8 As is evident from the results shown in Table 2, the embodiments 1 and 2 are superior to the conventional grinder in the grinding efficiency. The burn during the yrincling is relatively minor in the embodiments. It is also proven that performance is further improved by the para~fin wax treatment.
Although the description of the invention has been given with respect to particular embodiments, it is not to be construed in a limiting sense. Many variations and modifi-cations will now occur to those skilled in the art. For a definition of the invention, reference is made to the appended claims.
';: ' ' , .
i, . . . .
1 The present invention relates to improvements of rotary grinder for grinding metals, fire resistant bricks, stones and the like, and more particularly it aims to provide a rotary grinder which has a higher efficiency and generates less heat.
. It is known that a laminated rota:ry grinder comprising thin grindstone discs laminated together with a suitable space between each disc is superior to a rotary grinder comprising one thick grindstone. It is also disclosed in th.e applicant's Japanese Patent Publication No. ~0,091-78 which. was published August 8,1g78 that the space between each grindstone disc can be formed by coating the surface of the grindstone with a mixture of an adhesive and grinding particles or sand and the like of uniform diameter equivalent to the predetermined width of the space prior to laminating the grindstone cllscs în an a~ial direction ~o.r successive compxe~sion and f.iring. ~n this case, th~
adhesive layer is formed mainly for the purpose of providing a boss member of the grindstone disc and leaving the area of the outer circumference as an empty space.
As a result of successive studies, it has been found that a number of pores are formed even if the grindstone discs are bonded by coating the mixture of adhesive and grinding particles over the entire surface of the discs, although the grinder retains suficient strength against mechanical impact.
It has also been discovered that the grinding particles in the adhesive layer selectively fall off during the grinding operation, which contributes to an increase in grinding efficiency. These are improvements over the art as presently known and as noted in the preceeding paragraphs.
It is therefore an object of the present invention to provide a laminated grinder which incorporates these improve-ments.
. ...
J
-^ 10~39Z34 1 The laminated rotary grinder in accordance with the present invention has an adhesive layer of a mixture containing phenol resin and the like and inorganic particles having uniform and maximum diameter such as provides a space of a predetermined width between the discs, the adhesive layer covering the entire area or a part of the area extending from the inner circumference and the outer circumference.
Further objects and advantages of the invention will appear from the following description taken together with the accompanying drawings in which:
Figs. la through ld are plane views illustrating various ways of spreading an adhesive containing inorganic particles onto the surface of the thin grindstone disc.
Fig. 2 is a side view of a laminated rotary grinder.
Fig. 3 is an enlarged partial view of a laminated rotary grinder.
The present invention is applicable to an ordinary rotary grinder comprising two to ten grindstones laminated and each grindstone having the thickness T of between 1-10 mm, the 20 diameter D of between 50-1000 mm. It is particularly suitable for laminated grindstones of medium and large size such as D=150-200 and D,500-700 mm respectively when they are used ~or grinding aluminum, aluminum alloys and the like as the powdery dust from grinding adheres less to the outer circum-ference of the grindstone.
The space S between the laminated thin grindstone discs is normally in the range of 0.05-10 mm, and is preferably smaller than the thickness T of the grindstone. It is desirable that the space is narrow when the material to be ground is a metal and wider for brittle materials such as fire .
' , ' . , .
?89Z3~L
t resistant bricks and stones. The optimum width of the space ~or metals is S=0.1-1 mm. Such adjustment of the space S can be regulated by selecting inorganic particles whose maximum diameter corresponds with the desired space. The inorganic particles are mixed with an adhesive such as phenol resin, which is coated or spread over the thin grindstone disc to orm one layer. The grindstone thus treated is laminated with another grindstone and slid together under pressure before firing and molding into one grinder.
Although it is most convenient to use the grinding particles as said particle member mixed with an adhesive, particles obtained by pulverizing ordinary orogenic minerals such as quartz, feldspar, mica, magnetite, pyroxene, amphibole and the like in ~arying siæes, i.e., coarse ~2-0.5 ~Im)~ medium (0.5-0.25) and fine (0.25-0.01). In addition, natural or artificial pumice particles may also be used. Such pumice particles as "shirasu" which are obtained by firing and granulating "shirasu-balloon" are desirable because they are capable of retaining grinding liquid such as paraffin wax and grinding oil.
The adhesive mixture o inorganic particles and phenol resin is prepared by first mixing inorganic particles such as grinding particles with phenol resin in powder form and then adding liquid phenol resin to the irst mixture as a spreadin~
agent. Examples of various compositions are shown in Table 1.
The values in the table are expressed in weight parts.
Compositions 30 Grindstone particles 5 6 7 Powdered phenol resin 4 3 2 Liquid phenol resin 1 The particles containing adhesive is coated or spread on the disc surface. The inorganic particles 2 may be spread over the entire surface of the grindstone disc 1 as in Fig. la. It is also possible as in Fig. lb to spread the inorganic particles 2 radially extending from the inner circum-ference 3 to the outer circumference 4. It is still possible to spread the inorganic particles in a ring like formation as shown in Fig. lc as well as in combination of radial and ring for-mations such as shown in Fig. ld.
Another useful way to apply the particle containing adhesive to the disc is to place the particles containing adhesive in spots over the entire surface area of the disc. The inorganic particles are spread over the grindstone disc covering 30-100% of the surface area. Two or more grindstones are ground to each other creating a space e~uivalent to the diameter of the ~rinding particles, and then the discs are compressed under a pressure lower than the molding pressure and fired for two to five hours at a temperature between 120 and 200C.
One example of this laminated rotary grinder is shown -20 in Fig. 2; Fig. 3 is a partial enlarged view of Fig. 1. The ~
space between the thin grindstone discs 1 is formed due to ;
the shrinkage of the adhesive resin during firing of the discs and it i5 porous and mechanically weak. ~s seen in Fig. 3, the inorganic particles 2 help keep a space o~ predetermined width while providing numerous pores in this adhesive layer. So long as the inorganic particles having the maximum diameter are present in high density, presence of smaller particles 6 causes no problem, which is shown ïn Fig. 3 at the right hand side.
Reference numeral 7 denotes an object to be ground such as aluminum alloys-.. , . . , ~ , . . ...
,. . . ~ , , , . , :
.
~ 0~3,'~
1 In a laminated rotary grinder which is fabricated in accordance with the present invention to have the structure mentioned above, the space be-tween the grindstone discs can be made uniform and balanced in width even with larger grindstones having a diameter as large as 500 mm and more. Moreover, the presence of the inorganic particles in the space between the discs not only creates pores within the adhesive layer but also provides sufficient strength of adhesion. The grindstones are thus not easily dislocated by an ordinary mechanical impact.
The inorganic particles, however, come off first during grinding operation, which contributes to increase the efficiency.
Grinding efficiency is also increased if paraffin wax and the like is filled in said pores, which retain the paraffin during the operation.
Table 2 shows results of a grinding test using a lamlna~ed rotar~ grinder wherein the diameter oE the grindstone D is 150 mm, the thickness T is 4 mm and the space S is 0.1 mm, and a conventional commercial flat resinoid grindstone (150 x ;~
25 mm) as a comparative. The materials used are aluminum alloys and stainless steel. The grinding efficiency is determined by the amount of grinding achieved per minute at a circumferential rate of 1630 m/min. and under a load of 10 kg. The adhesive agent, prepared according to the composition 1 of Table 1 using 0.1 mm grindstone particles, is evenly spread over approximately 70% of the surface of the A-24-150-4 discs.
1~8~2~4 i 1 TABLE_2 Grindstone Aluminum Alloys Stainless Steel Grindstone Efficiency amt. of Efficiency amt. of particle A-24 g/min. wear g/min. g/min. wear g/min.
Embodiment 1 150mmx4mmx6 discs 6.7 3.0 7.3 1.8 (S=0.1 mm) Embodiment 2 Same as Emb.l 11.2 1.9 8.5 2.1 treated w/paraffin Comparative 150x25xl disc 2.1 1.5 3.4 0.8 As is evident from the results shown in Table 2, the embodiments 1 and 2 are superior to the conventional grinder in the grinding efficiency. The burn during the yrincling is relatively minor in the embodiments. It is also proven that performance is further improved by the para~fin wax treatment.
Although the description of the invention has been given with respect to particular embodiments, it is not to be construed in a limiting sense. Many variations and modifi-cations will now occur to those skilled in the art. For a definition of the invention, reference is made to the appended claims.
';: ' ' , .
i, . . . .
Claims (6)
1. A laminated rotary grinder comprising thin grindstone discs and an adhesive layer of organic resin mixed with inorganic particles having a uniform and maximum diameter of a predetermined size which corresponds with a spacing between said laminated grindstone discs, said adhesive layer being formed at least on a part of the area extending from the inner circumference to the outer circumference of the grindstone.
2. A grinder as claimed in claim 1 wherein there are to 10 grindstone discs.
3. A grinder as claimed in claim 2 wherein each disc has a thickness of between 1 to 10 mm and a diameter of between 50 to 1000 mm and a space of substantially 0.05 to 10 mm between the discs.
4. A grinder as claimed in claim 1 wherein the inorganic particles are quartz, feldspar, mica, magnetite, pyroxene, amphibole, or pumice.
5. A grinder as claimed in claims 1, 3 and 4 wherein the particles are spread over 30 to 100% of the surface area.
6. A grinder as claimed in claim 4 wherein said organic resin is phenol resin.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7236377A JPS5940593B2 (en) | 1977-06-18 | 1977-06-18 | Laminated rotating grindstone |
| JP72,363/77 | 1977-06-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1089234A true CA1089234A (en) | 1980-11-11 |
Family
ID=13487146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA305,657A Expired CA1089234A (en) | 1977-06-18 | 1978-06-16 | Laminated rotary grinder |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS5940593B2 (en) |
| CA (1) | CA1089234A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01153278A (en) * | 1987-12-09 | 1989-06-15 | F S K:Kk | Grinding stone for super finish |
| JPH0376516A (en) * | 1989-08-19 | 1991-04-02 | Mitsuhiro Hasegawa | Root wrapping net |
-
1977
- 1977-06-18 JP JP7236377A patent/JPS5940593B2/en not_active Expired
-
1978
- 1978-06-16 CA CA305,657A patent/CA1089234A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS547694A (en) | 1979-01-20 |
| JPS5940593B2 (en) | 1984-10-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |