CN113043181A - Forming method of resin diamond abrasive disc - Google Patents
Forming method of resin diamond abrasive disc Download PDFInfo
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- CN113043181A CN113043181A CN202110142165.2A CN202110142165A CN113043181A CN 113043181 A CN113043181 A CN 113043181A CN 202110142165 A CN202110142165 A CN 202110142165A CN 113043181 A CN113043181 A CN 113043181A
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- preheating
- mixed powder
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- die
- diamond
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
- B24D18/0009—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using moulds or presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
- B24D18/0072—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using adhesives for bonding abrasive particles or grinding elements to a support, e.g. by gluing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
- B24D18/009—Tools not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D99/00—Subject matter not provided for in other groups of this subclass
- B24D99/005—Segments of abrasive wheels
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
The invention discloses a molding method of a resin diamond grinding disc, belonging to the field of grinding tool processing, wherein mixed powder is put on a high-frequency preheating machine for preheating, the oscillation frequency of the high-frequency preheating machine is 50-100MHZ, the power is 3-10KW, and the preheating time is 30-60 s. The invention has the beneficial effects that: the high-frequency preheating machine is adopted for preheating, water and volatile matters in the mixed powder are removed, the fluidity can be enhanced, the forming time is shortened, the internal stress of materials is eliminated, and the water marks of products are eliminated, so that the method has the advantages of high production efficiency, low labor intensity, high yield, prolonged service life of a die, stable product performance, appearance luminosity and the like.
Description
Technical Field
The invention relates to the field of abrasive tool processing, in particular to a forming method of a resin diamond abrasive disc.
Background
In the field of stone material surface processing, a diamond grinding tool has incomparable superiority and is more and more widely applied in the field of material surface polishing. Diamond resin abrasives are the largest group of diamond abrasives used, and currently, about 60% of the abrasive grade diamonds in the world are used to make resin bonded diamond abrasives. Compared with other types of diamond grinding tools, the resin bonding agent diamond grinding tool has certain elasticity, higher bonding strength and good polishing performance, and has the characteristics of low hardening temperature, short production period, simple equipment and the like. The method is widely applied to grinding processes such as coarse grinding, fine grinding and polishing. However, the current preparation method of the resin diamond abrasive disc has the defects of low production efficiency, long forming time, high labor intensity, large dust in the charging process and the like.
Accordingly, the present inventors have made extensive studies to solve the above problems and have made the present invention.
Disclosure of Invention
Aiming at the problems of low production efficiency, long forming time, high labor intensity, large dust in the charging process and the like of the preparation method of the resin diamond grinding disc in the prior art, the invention provides the forming method of the resin diamond grinding disc, which has the advantages of high production efficiency, low labor intensity, high yield, stable product performance, appearance luminosity and the like, solves the problem of dust emission in the production process, and is very suitable for mass production. The specific technical scheme is as follows:
a method for forming resin diamond grinding disc includes preheating mixed powder in high-frequency preheating machine. Preheating the mixed powder by a high-frequency preheating machine, removing water and volatile matters in the mixed powder, eliminating water marks of the product, and improving the appearance brightness of the finished product; the uniformity of preheating and heating is improved, the flowability of the powder can be enhanced, the pressing time is shortened, the internal stress of the material is eliminated, and the mechanical property of the product is improved; through high-frequency preheating, the problems of dust emission in the production process, air holes, cracks, uneven appearance and the like in the semi-finished product can be solved, and more importantly, the service performance of the product is improved.
The common preheating method for the mixed powder is conduction preheating, such as an oven and an oven, heat flow is guided into the center from the surface of the material, and the temperature difference between the inside and the outside of the preheated material is large due to the poor heat conduction performance of the resin powder. The high-frequency preheating is that under the action of a frequency-modulated electric field, polar molecules of the material frequently oscillate and twist along with the continuous change of the direction of the electric field, so that the molecules rub against each other to generate heat. The material is preheated by the heat, so that each part of the high-frequency preheated material is almost heated at the same time, and the material is uniformly heated, has consistent hardening degree, small internal stress and good mechanical property. Meanwhile, volatile matters in the material can be completely escaped through high-frequency preheating of the powder, so that the electrical performance, the mechanical performance and the grinding performance of a grinding tool can be improved, the heating speed is high (only dozens of seconds), the heating speed is improved by 5 times compared with that of conductive preheating, the fluidity of the resin powder is obviously improved, the abrasion of the mould (particularly prominent to mineral powder filling compression plastic) can be reduced, the compression pressure is reduced, the chemical reaction time of the resin powder in the hot-press molding process is shortened, the production efficiency is improved, and the production cost is reduced. Because the moisture and volatile matters in the material escape in the high-frequency preheating process, the interference of the moisture and the volatile matters is eliminated in the chemical reaction process of the resin powder, the resin powder is cured more continuously and thoroughly, and the produced product has higher density and strength. Therefore, the high-frequency preheating of the powder is increased in the production process of the resin diamond grinding disc, so that a relatively ideal preheating effect can be achieved.
Preferably, the oscillation frequency of the high-frequency preheating machine is 50-100MHZ, the power is 3KW-10KW, and the preheating time is 30-60 s.
Preferably, the water content in the mixed powder is reduced to below 0.1% by preheating, and the temperature is kept between 70 and 90 ℃.
Preferably, the preheated mixed powder is put into an integral die to be scraped, nylon hook cloth is put into a die cavity, the die is closed to be pressed and formed, and the die is opened to take out the grinding plate working layer.
Preferably, the press molding uses a one-piece mold instead of the conventional split mold, and the one-piece mold is installed on the upper and lower press plates of the press vulcanizer to perform the hot press molding. Because the upper die and the lower die of the die are fixed on the machine table, die opening and die releasing are directly completed on the machine table, the die does not need to be moved to a stripper for demoulding, manual demoulding after die opening in the traditional process is replaced, convenience and rapidness are realized, and meanwhile, the labor intensity is greatly reduced.
Preferably, the temperature in the press vulcanizer is 145-155 ℃ and the pressure is 50-100kg/cm2And the heat preservation time is 3-5 min.
Preferably, the back surface of the working layer of the grinding plate is glued with nylon flannelette by glue to prepare the diamond grinding plate.
Preferably, the mixed powder comprises the following components in percentage by weight: 10-15% of diamond, 40-50% of phenolic resin, 10-15% of silicon carbide, 5-10% of white corundum, 3-5% of zinc stearate and 20-30% of filler.
Preferably, the mixed powder is prepared by mixing and stirring the components in proportion for 3-6 hours.
Preferably, the filler comprises at least one of calcium carbonate, zinc oxide and aluminum oxide.
The technical scheme of the invention has the following beneficial effects:
(1) the high-frequency preheating can effectively remove moisture in the powder before pressing and organic volatile matters in the material, eliminate water marks of the product and improve the appearance brightness of the finished product.
(2) The method is favorable for exerting the characteristic of uniform high-frequency preheating and heating, can enhance the flowability of the powder, shorten the pressing time, eliminate the internal stress of the material and improve the mechanical property of the product.
(3) Through high-frequency preheating, the problems of dust emission in the production process, air holes, cracks, uneven appearance and the like in the semi-finished product can be solved, and more importantly, the service performance of the product is improved.
(4) By adopting the 'one-out-nine' integral die, automatic die opening and die closing can be realized in the production process, the original problem of manual die release is replaced, the production efficiency is greatly improved, and the labor intensity is reduced.
(5) Because whole mould is fixed on the board, the mould temperature is invariable, has avoided the problem that the mould temperature that original manual drawing of patterns arouses descends, has shortened the shaping time, makes the product more stable simultaneously.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in detail and completely with reference to the examples of the present invention, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, provided in the examples, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
According to the embodiment, the high-frequency preheating machine is adopted to preheat the mixed powder, so that water and volatile matters in the mixed powder are removed, the water marks of the product are eliminated, the appearance brightness of the finished product is improved, and the purpose of improving the use performance of the product is achieved. The specific technical scheme is as follows:
a method for forming resin diamond grinding disc includes preheating mixed powder in high-frequency preheating machine. Preheating the mixed powder by a high-frequency preheating machine, removing water and volatile matters in the mixed powder, eliminating water marks of the product, and improving the appearance brightness of the finished product; the uniformity of preheating and heating is improved, the flowability of the powder can be enhanced, the pressing time is shortened, the internal stress of the material is eliminated, and the mechanical property of the product is improved; through high-frequency preheating, the problems of dust emission in the production process, air holes, cracks, uneven appearance and the like in the semi-finished product can be solved, and more importantly, the service performance of the product is improved.
The common preheating method for the mixed powder is conduction preheating, such as an oven and an oven, heat flow is guided into the center from the surface of the material, and the temperature difference between the inside and the outside of the preheated material is large due to the poor heat conduction performance of the resin powder. The high-frequency preheating is that under the action of a frequency-modulated electric field, polar molecules of the material frequently oscillate and twist along with the continuous change of the direction of the electric field, so that the molecules rub against each other to generate heat. The material is preheated by the heat, so that each part of the high-frequency preheated material is almost heated at the same time, and the material is uniformly heated, has consistent hardening degree, small internal stress and good mechanical property. Meanwhile, volatile matters in the material can be completely escaped through high-frequency preheating of the powder, so that the electrical performance, the mechanical performance and the grinding performance of a grinding tool can be improved, the heating speed is high (only dozens of seconds), the heating speed is improved by 5 times compared with that of conductive preheating, the fluidity of the resin powder is obviously improved, the abrasion of the mould (particularly prominent to mineral powder filling compression plastic) can be reduced, the compression pressure is reduced, the chemical reaction time of the resin powder in the hot-press molding process is shortened, the production efficiency is improved, and the production cost is reduced. Because the moisture and volatile matters in the material escape in the high-frequency preheating process, the interference of the moisture and the volatile matters is eliminated in the chemical reaction process of the resin powder, the resin powder is cured more continuously and thoroughly, and the produced product has higher density and strength. Therefore, the high-frequency preheating of the powder is increased in the production process of the resin diamond grinding disc, so that a relatively ideal preheating effect can be achieved.
In a preferred embodiment, the oscillation frequency of the high-frequency preheating machine is 50-100MHz, the power is 3KW-10KW, and the preheating time is 30-60 s.
As a preferred embodiment, the moisture content in the mixed powder is reduced to below 0.1% by preheating, and the temperature is kept at 70-90 ℃.
In a preferred embodiment, the preheated mixed powder is put into a whole die to be scraped, nylon hook cloth is put into a die cavity, the die is closed to be pressed and formed, and the die is opened to take out the grinding plate working layer.
In a preferred embodiment, the press molding is performed by hot press molding by mounting the integral mold on upper and lower heating plates of a press vulcanizer. Because the upper die and the lower die of the die are fixed on the machine table, the die opening and the die releasing are simultaneously carried out, the manual die releasing after the die opening of the traditional process is replaced, the operation is convenient and fast, and the labor intensity is greatly reduced.
As a preferred embodiment, the temperature in the press vulcanizer is 145-155 ℃ and the pressure is 50-100kg/cm2And the heat preservation time is 3-5 min.
As a preferred embodiment, the back surface of the working layer of the grinding plate is glued with nylon flannel by glue to prepare the diamond grinding plate.
As a preferred embodiment, the mixed powder comprises the following components in percentage by weight: 10-15% of diamond, 40-50% of phenolic resin, 10-15% of silicon carbide, 5-10% of white corundum, 3-5% of zinc stearate and 20-30% of filler.
As a preferred embodiment, the mixed powder is prepared by mixing and stirring the components according to the proportion for 3 to 6 hours.
As a preferred embodiment, the filler includes at least one of calcium carbonate, zinc oxide, and aluminum oxide.
The following provides a further description of the advantageous effects of the solution according to the present embodiment through several sets of examples and comparative examples.
Example one
The forming method of the resin diamond grinding disc in the embodiment comprises the following specific steps:
step one, mixing 10% of diamond, 45% of phenolic resin, 10% of silicon carbide, 6% of white corundum, 4% of zinc stearate and 25% of filler according to weight percentage, fully stirring for 5 hours, and uniformly mixing to prepare mixed powder;
step two, putting the mixed powder on a high-frequency preheating machine for preheating for 35s, wherein the oscillation frequency is 62MHZ, the power is 5KW, the moisture content in the mixed powder is reduced to be below 0.1%, and the temperature is kept at 70 ℃;
thirdly, putting the preheated powder into an integral die, leveling, and putting nylon hook cloth on a die cavity; closing the die, pressing and forming, opening the die and taking out the grinding plate working layer;
and step four, gluing the back surface of the grinding sheet working layer with nylon flannelette by using glue to obtain the diamond grinding sheet.
Example two
The forming method of the resin diamond grinding disc in the embodiment comprises the following specific steps:
step one, mixing 15% of diamond, 40% of phenolic resin, 15% of silicon carbide, 5% of white corundum, 5% of zinc stearate and 20% of filler according to weight percentage, fully stirring for 5 hours, and uniformly mixing to prepare mixed powder;
step two, putting the mixed powder on a high-frequency preheating machine for preheating for 30s, wherein the oscillation frequency is 72MHZ, the power is 5KW, so that the moisture content in the mixed powder is reduced to be below 0.1%, and the temperature is kept at 80 ℃;
thirdly, putting the preheated powder into an integral die, leveling, and putting nylon hook cloth on a die cavity; closing the die, pressing and forming, opening the die and taking out the grinding plate working layer;
and step four, gluing the back surface of the grinding sheet working layer with nylon flannelette by using glue to obtain the diamond grinding sheet.
EXAMPLE III
The forming method of the resin diamond grinding disc in the embodiment comprises the following specific steps:
step one, mixing 12% of diamond, 43% of phenolic resin, 15% of silicon carbide, 7% of white corundum, 3% of zinc stearate and 20% of filler according to weight percentage, fully stirring for 5 hours, and uniformly mixing to prepare mixed powder;
step two, putting the mixed powder on a high-frequency preheating machine for preheating for 40s, wherein the oscillation frequency is 62MHZ, the power is 7KW, so that the moisture content in the mixed powder is reduced to be below 0.1 percent, and the temperature is kept at 80 ℃;
thirdly, putting the preheated powder into an integral die, leveling, and putting nylon hook cloth on a die cavity; closing the die, pressing and forming, opening the die and taking out the grinding plate working layer;
and step four, gluing the back surface of the grinding sheet working layer with nylon flannelette by using glue to obtain the diamond grinding sheet.
Comparative example 1
The forming method of the resin diamond grinding disc in the comparative example comprises the following specific steps:
step one, mixing 10% of diamond, 45% of phenolic resin, 10% of silicon carbide, 6% of white corundum, 4% of zinc stearate and 25% of filler according to weight percentage, fully stirring for 5 hours, and uniformly mixing to prepare mixed powder;
step two, putting the mixed powder into an oven for preheating, wherein the preheating temperature of the oven is 70 ℃, and the preheating time is 35 s;
thirdly, putting the preheated powder into an integral die, leveling, and putting nylon hook cloth on a die cavity; closing the die, pressing and forming, opening the die and taking out the grinding plate working layer;
and step four, gluing the back surface of the grinding sheet working layer with nylon flannelette by using glue to obtain the diamond grinding sheet.
Comparative example No. two
The forming method of the resin diamond grinding disc in the comparative example comprises the following specific steps:
step one, mixing 10% of diamond, 45% of phenolic resin, 10% of silicon carbide, 6% of white corundum, 4% of zinc stearate and 25% of filler according to weight percentage, fully stirring for 5 hours, and uniformly mixing to prepare mixed powder;
secondly, putting the preheated powder into a separate one-out-one mould, strickling, and then putting the nylon hook cloth on a steel mould; finally, a pressing head is placed, the steel die and the pressing head are placed on an oil press for hot press molding, after the steel die and the pressing head are taken out of the oil press, the die is placed on a stripper for demoulding, and the grinding plate working layer is taken out;
and step three, gluing the back surface of the grinding sheet working layer with nylon flannelette by using glue to obtain the diamond grinding sheet.
Comparative example No. three
The forming method of the resin diamond grinding disc in the comparative example comprises the following specific steps:
step one, mixing 10% of diamond, 45% of phenolic resin, 10% of silicon carbide, 6% of white corundum, 4% of zinc stearate and 25% of filler according to weight percentage, fully stirring for 5 hours, and uniformly mixing to prepare mixed powder;
step two, putting the mixed powder on a high-frequency preheating machine for preheating for 70s, wherein the oscillation frequency is 62MHZ, the power is 5KW, so that the moisture content in the mixed powder is reduced to be below 0.1%, and the temperature is kept at 100 ℃;
thirdly, putting the preheated powder into an integral die, leveling, and putting nylon hook cloth on a die cavity; closing the die, pressing and forming, opening the die and taking out the grinding plate working layer;
and step four, gluing the back surface of the grinding sheet working layer with nylon flannelette by using glue to obtain the diamond grinding sheet.
Experiments show that the forming process in the embodiment effectively improves the production efficiency in the preheating link and the die assembly and demolding link, the production efficiency is greatly improved, the qualification rate is more than 98%, and the diamond abrasive disc prepared by the three groups of embodiments and the three groups of comparative examples is tested for sharpness, service life, glossiness and the like, and the specific results are as follows:
table 1 sets of examples and comparative examples give diamond abrasive disc test results
As can be seen from Table 1, the performance of the grinding sheet product is improved by adopting the forming process in the embodiment, the product has higher sharpness, longer service life, good stability and appearance brightness, and the product percent of pass is higher than that of the grinding sheet in the comparative example.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A forming method of a resin diamond abrasive disc is characterized in that mixed powder is placed on a high-frequency preheating machine for preheating.
2. The method of claim 1, wherein the high frequency preheating machine has an oscillation frequency of 50 to 100MHZ, a power of 3KW to 10KW, and a preheating time of 30 to 60 s.
3. The method of claim 2, wherein the moisture content of the mixed powder is reduced to less than 0.1% by preheating, and the temperature is maintained at 70-90 ℃.
4. The method of claim 1, wherein the preheated mixed powder is placed in a whole mold and scraped off, and nylon cloth is placed in a mold cavity, the mold is closed and pressed, and the mold is opened to take out the working layer of the grinding plate.
5. The method as claimed in claim 4, wherein the press-forming is performed by hot press-forming the entire mold on upper and lower heating plates of a press vulcanizer.
6. The method as claimed in claim 5, wherein the temperature in the vulcanizing press is 145-155 ℃ and the pressure is 50-100kg/cm2And the heat preservation time is 3-5 min.
7. The method of claim 6, wherein the back surface of the working layer of the grinding plate is glued with nylon flannel to produce a diamond grinding plate.
8. The method of claim 1, wherein the mixed powder comprises the following components in percentage by weight: 10-15% of diamond, 40-50% of phenolic resin, 10-15% of silicon carbide, 5-10% of white corundum, 3-5% of zinc stearate and 20-30% of filler.
9. The method of claim 8, wherein the mixed powder is prepared by mixing and stirring the components in proportion for 3 to 6 hours.
10. The method of claim 8, wherein the filler comprises at least one of calcium carbonate, zinc oxide, and aluminum oxide.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110142165.2A CN113043181A (en) | 2021-02-02 | 2021-02-02 | Forming method of resin diamond abrasive disc |
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| CN202110142165.2A CN113043181A (en) | 2021-02-02 | 2021-02-02 | Forming method of resin diamond abrasive disc |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114918841A (en) * | 2022-02-28 | 2022-08-19 | 泉州众志新材料科技有限公司 | Preparation method of resin diamond abrasive disc |
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