CN114918841A - Preparation method of resin diamond abrasive disc - Google Patents
Preparation method of resin diamond abrasive disc Download PDFInfo
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- CN114918841A CN114918841A CN202210186204.3A CN202210186204A CN114918841A CN 114918841 A CN114918841 A CN 114918841A CN 202210186204 A CN202210186204 A CN 202210186204A CN 114918841 A CN114918841 A CN 114918841A
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- 229920005989 resin Polymers 0.000 title claims abstract description 39
- 239000011347 resin Substances 0.000 title claims abstract description 39
- 239000010432 diamond Substances 0.000 title claims abstract description 36
- 229910003460 diamond Inorganic materials 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 238000007731 hot pressing Methods 0.000 claims abstract description 126
- 238000003825 pressing Methods 0.000 claims abstract description 103
- 239000000463 material Substances 0.000 claims abstract description 88
- 238000000227 grinding Methods 0.000 claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 28
- 238000005245 sintering Methods 0.000 claims abstract description 27
- 239000002245 particle Substances 0.000 claims abstract description 24
- 238000005303 weighing Methods 0.000 claims abstract description 16
- 238000000465 moulding Methods 0.000 claims abstract description 15
- 238000011049 filling Methods 0.000 claims abstract description 9
- 239000004677 Nylon Substances 0.000 claims abstract description 8
- 229920001778 nylon Polymers 0.000 claims abstract description 8
- 239000004744 fabric Substances 0.000 claims abstract description 7
- 238000004026 adhesive bonding Methods 0.000 claims abstract description 4
- 239000003292 glue Substances 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 66
- 239000002994 raw material Substances 0.000 claims description 22
- 238000003756 stirring Methods 0.000 claims description 14
- 230000006835 compression Effects 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 6
- 239000008187 granular material Substances 0.000 claims description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 3
- 239000010431 corundum Substances 0.000 claims description 3
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000005011 phenolic resin Substances 0.000 claims description 3
- 229920001568 phenolic resin Polymers 0.000 claims description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 3
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims description 3
- 239000000428 dust Substances 0.000 abstract description 14
- 238000007790 scraping Methods 0.000 abstract description 12
- 238000009826 distribution Methods 0.000 abstract description 10
- 239000000843 powder Substances 0.000 description 14
- 238000005498 polishing Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000010907 mechanical stirring Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000002470 thermal conductor Substances 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
- B24D3/20—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially organic
- B24D3/28—Resins or natural or synthetic macromolecular compounds
- B24D3/32—Resins or natural or synthetic macromolecular compounds for porous or cellular structure
-
- 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
- B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
- B24D7/06—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental
Abstract
A preparation method of a resin diamond grinding plate comprises the following steps: step 1, placing the prepared cold pressed blank into a hot-pressing die, and then placing nylon hook cloth on the cold pressed blank; step 2, putting the hot-pressing die after die filling into a flat vulcanizing machine for hot-pressing forming; a. hot-pressing and crushing: the hot-pressing pressure of the first hot-pressing is 200- 2 For 3-5 s; crushing the cold pressing blank into particles which are uniformly filled into a particle cavity of a hot pressing die; b. hot-pressing and sintering: the hot pressing pressure of the second hot pressing is 50-100kg/cm 2 For 5-7 min; the second hot pressing is the existing hot pressing sintering process, and the crushed cold pressing blank is sintered into a molding grinding sheet working layer; step 3, opening the die and taking out the grinding plate working layer; step 4, gluing the back surface of the grinding sheet working layer with nylon flannelette by using glue to prepare a resin diamond grinding sheet; the invention uses cold-pressed compactAnd the secondary hot press molding abrasive disc is carried out, the material distribution is uniform, the steps of material weighing, material scraping and the like are saved, the production efficiency is high, the labor intensity is low, no dust pollution is caused, the product stability is high, and the yield is high.
Description
Technical Field
The invention relates to the field of processing of resin grinding tools, in particular to a preparation method of a resin diamond grinding 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; 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 grinding process is widely applied to grinding processes such as coarse grinding, fine grinding and polishing; at present, the resin diamond abrasive disc in the industry still adopts the manual weighing-scraping-hot pressing mode for operation during hot-press molding; because the resin abrasive disc has more particles and each particle cavity on the hot-pressing die is smaller (the size is 0.05 cm) 3 Left and right), resulting in higher requirements on the stability of the weight of the material powder and the degree of material powder strickling; however, the manual operation often causes higher rejection rate (mainly partial material shortage) due to different mastery degrees of personnel quality, experience and skill, and the production efficiency is low; even if some material shortage can not be obviously accepted, the performance of the grinding sheet is influenced; moreover, the problem of dust emission of the material powder exists in the processes of weighing and scraping in production, the fit clearance of the hot pressing die is between 0.2 and 0.4mm, the material powder is easy to leak out of the die cavity in the processes of loading and transferring, the dust pollution is large, the utilization rate of the material powder is directly influenced, and the production cost is increased; workers need to painstakingly clean the flash materials on the hot-pressing die, so that the labor intensity is improved, and the working efficiency is reduced; moreover, when the abrasive disc is directly hot-pressed and formed by the conventional powder, the product has the problem of air holes inside, so that the performance of the abrasive disc is influenced; therefore, the preparation method of the resin diamond grinding disc in the prior art has the problems of low production efficiency, high labor intensity, high dust pollution, poor product stability, high reject ratio and the like.
In view of the above, the present inventors have made extensive studies and research, and developed and designed a proposal to overcome the drawbacks and inconveniences caused by the imperfect production of the resin diamond grinding disc.
Disclosure of Invention
The invention aims to provide a preparation method of a resin diamond abrasive disc, which is characterized in that a cold pressing blank is used for hot pressing and sintering twice to form the abrasive disc, the material distribution is uniform, the steps of weighing, scraping and the like are saved, the production efficiency is high, the labor intensity is low, no dust pollution is caused, the product stability is high, and the yield is high.
In order to achieve the above purpose, the solution of the invention is:
a preparation method of a resin diamond grinding plate comprises the following steps:
step 2, putting the hot-pressing die after die filling into a flat vulcanizing machine for hot-pressing forming;
a. hot-pressing and crushing: the hot-pressing pressure of the first hot-pressing is 200- 2 For 3-5 s; uniformly filling the cold-pressed blank particles into a particle cavity of a hot-pressing die;
b. hot-pressing and sintering: the hot pressing pressure of the second hot pressing is 50-100kg/cm 2 For 5-7 min; the second hot pressing is the existing hot pressing sintering process, and the crushed cold pressing blank is sintered into a molding abrasive disc working layer;
step 3, pressing and molding the hot-pressing mold on a flat vulcanizing machine, and opening the mold to take out the abrasive disc working layer;
and 4, gluing the back surface of the grinding sheet working layer with nylon flannelette by using glue to obtain the resin diamond grinding sheet.
The size of hot pressing die's single granule cavity is 5mm, and the width of the arris of single granule cavity is 1mm, and the span between adjacent two arris is 5mm, the width of arris: the span of the edge is 1: 5.
In step 2, the hot-pressing pressure for hot-pressing crushing was 200kg/cm 2 。
In step 1, the method for preparing the cold compact has the following steps:
s1, preparing cold-pressed blank raw materials: weighing cold-pressed blank raw materials according to the weight percentage, putting the cold-pressed blank raw materials into a hopper, fully stirring for 3-5 hours, and uniformly mixing to prepare a mixture;
s2, blanking of cold-pressed blank raw materials into a material box: the hopper is connected with the spiral discharging pipe, vibrates and is matched with the spiral discharging pipe to rotate to convey a mixture to a material box of the cold press;
s3, stirring the cold-pressed blank raw materials again: a stirrer is arranged in the material box, and the mixture entering the material box is stirred again;
s4, blanking the cold-pressed blank raw material into a cold-pressing die cavity: the material box is horizontally pushed above the cold pressing die cavity, and the mixture in the material box falls into the cold pressing die cavity;
s5, cold pressing preparation: after the cold pressing die cavity is filled with the mixture, the plane of the cold pressing die can be lifted upwards by 3-5mm, and the plane of the mixture can be lower than the plane of the cold pressing die;
s6, cold pressing and cold forming of the blank: the cold press uses the pressure of 30-60T, the upper and lower pressure heads simultaneously apply the pressure of the upper and lower directions to the mixture, and the cold press is formed into a cold pressed blank;
s7, cold-pressed blank demoulding: after the upper and lower pressing heads apply pressure in two directions to form cold pressed blanks through cold pressing, the upper and lower pressing heads are not loosened, the cold pressing die platform sinks, and after the cold pressed blanks are ejected out of the cold pressing die platform, the upper and lower pressing heads return;
s8, collecting and stacking cold-pressed blanks: a mechanical arm with 4 sucking discs with the diameter of 1cm can automatically suck cold pressing blanks to be placed on a conveying belt, and the cold pressing blanks are stacked together one by one.
In step S1, the cold-pressed blank raw material 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.
In step S2, the vibration frequency of the hopper is 100-200 times/min.
In step S3, the stirring speed of the stirrer of the material box is 300-600 rpm.
In step S4, in the blanking process, the stirrer on the material box rotates forwards for 0.7-1.2 seconds and rotates backwards for 0.7-1.2 seconds.
In step S4, the capsule controls the material weight of the cold compact by means of constant volume.
In step S6, the compression ratio at the time of cold press molding of the cold compact is controlled to be between 2 and 3.
In step S7, the cold pressing mold counts the number of cold pressed blanks each time of cold press forming, and the production number is automatically accumulated.
In step S8, the number of stacked green compacts is set to 10 to 20, and after the number of stacked green compacts reaches the set number, the conveyor moves a position of one of the cold green compacts, and the stacking is resumed.
After the structure is adopted, the preparation method of the resin diamond abrasive disc uses the cold pressing blank to carry out secondary hot pressing sintering molding of the abrasive disc, the material distribution is uniform, the steps of material weighing, material scraping and the like are saved, the production efficiency is high, the labor intensity is low, no dust pollution is caused, the product stability is high, and the yield is high; the following advantages are specified:
1. the cold pressing blank is a disc-shaped integral structure formed by cold pressing of a grinding disc mixture, the cold pressing blank is directly blanked into a hot pressing die, the steps of material weighing and material scraping can be saved, the problem of dust raising in the processes of material weighing and material scraping in production can be solved, the higher requirements on the quality, experience and skill of workers during manual material weighing and material scraping can be avoided, one person can operate two flat vulcanizing machines, and the working efficiency of the workers is improved;
2. the cold pressed compact is not powder, so that the flying of material weighing dust can be avoided during blanking, no dust pollution is caused, and the environment is protected; workers do not need to painstakingly clean the scrap edges on the die, so that the labor intensity is reduced;
3. the specifications of the cold pressed blanks are unified, the weight difference of each cold pressed blank is controlled within +/-0.2 g, the flatness of the cold pressed blanks is completely consistent, the material distribution is uniform, the production efficiency is high, the labor intensity is low, and the yield is high;
4. because the fit clearance of the hot-pressing die is between 0.2 mm and 0.4mm, the mixture is easy to leak out of the hot-pressing die in the original charging and transferring processes, and a cold-pressed blank is put into the hot-pressing die, so that powder leakage during charging is avoided, no flash is generated during hot pressing, and the direct utilization rate of the mixture is improved; each product can be normally produced only by using 80% of the feeding amount of the original mixture, so that the cost is reduced;
5. when the abrasive disc is sintered by hot pressing, the hot pressing process of the cold pressing blank and the hot pressing of the powder are carried outThe difference of the process is that the process is divided into two times when in hot pressing, the first hot pressing is broken, and the hot pressing pressure of the first hot pressing is 200- 2 For 3-5 s; crushing the cold pressing blank into particles which are uniformly filled into a particle cavity of a hot pressing die; and (3) hot-pressing sintering for the second time: the hot pressing pressure of the second hot pressing is 50-100kg/cm 2 For 5-7 min; the second hot pressing is the existing hot pressing sintering process, and the crushed cold pressing blank is sintered into a molding grinding sheet working layer; the surface area is increased after the cold pressing blank is crushed, so that the conduction of temperature and the release of ammonia gas during softening are facilitated, the hot pressing sintering is more sufficient, the performance of the manufactured grinding sheet is more stable, and the yield is high;
6. because the non-broken cold-pressed blank is an integral body, the contact point of the cold-pressed blank and the hot-pressing die is only the edge on the hot-pressing die; in this case, when the hot pressing sintering is performed directly, only the part contacting the edge is heated and softened first and then the heat is transferred to the part not contacting the edge; as is well known, resin materials are poor thermal conductors, and the thermal conductivity of the resin materials is 3 orders of magnitude smaller than that of metal materials, so that the cold-pressed compact forms a temperature difference rapidly at a place where the cold-pressed compact is contacted with the edge and a place where the cold-pressed compact is not contacted with the middle position of the particle cavity, the resin at the place where the cold-pressed compact is contacted with the edge reaches a curing point and is hardened, and cold-pressed compacts at other places are not softened, so that the abrasive disc cannot be formed by hot-pressing and sintering; therefore, before hot-pressing sintering, the cold-pressed blank needs to be subjected to hot-pressing crushing, so that the cold-pressed blank is uniformly heated and a high-quality hot-pressing molding abrasive disc is obtained;
7. the mixture is cold-pressed by a cold press, air in the mixture is removed after cold pressing, and the problem of product pores in the prior direct hot pressing of powder is solved.
Drawings
FIG. 1 is a schematic front view of a cold compact of the present invention;
FIG. 2 is a schematic front view of a hot press mold of the present invention;
fig. 3 is a schematic sectional view along the direction a-a of the hot press mold of the present invention.
Description of the symbols
A cold-pressed compact 10; a hot-pressing die 1; particles 11; a rib 12; the width W of the edge; the span L of the ribs.
Detailed Description
In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.
Referring to fig. 1 to 3, the present invention discloses a method for manufacturing a resin diamond grinding plate, comprising the following steps:
step 2, putting the hot-pressing die 1 after die filling into a flat vulcanizing machine for hot-pressing forming;
a. hot-pressing and crushing: the hot-pressing pressure of the first hot-pressing is 200- 2 For 3-5 s; uniformly filling the particles 11 in the cavity of the hot-pressing die 1 after the cold-pressed blank 10 is granulated;
b. hot-pressing and sintering: the hot pressing pressure of the second hot pressing is 50-100kg/cm 2 For 5-7 min; the second hot pressing is the existing hot pressing sintering process, and the crushed cold pressing blank 10 is sintered to form a grinding sheet working layer;
step 3, pressing and forming the hot-pressing die 1 on a flat vulcanizing machine, and opening the die to take out the abrasive disc working layer;
and 4, gluing the back surface of the grinding sheet working layer with nylon flannelette by using glue to obtain the resin diamond grinding sheet.
According to the preparation method of the resin diamond abrasive disc, the cold pressing blank 10 is used for carrying out secondary hot pressing sintering molding abrasive disc, the material distribution is uniform, the steps of material weighing, material scraping and the like are saved, the production efficiency is high, the labor intensity is low, no dust pollution is caused, the product stability is high, and the yield is high; the following advantages are specified:
1. the cold pressed blank 10 is a wafer-shaped integral structure formed by cold pressing of a grinding piece mixture, the cold pressed blank 10 is directly fed into the hot pressing die 1, the steps of material weighing and material scraping can be saved, the problem of dust raising in the process of material weighing and material scraping in production can be solved, the higher requirements on the quality, experience and skill of workers during manual material weighing and material scraping can be avoided, one person can operate two flat vulcanizing machines, and the working efficiency of the workers is improved;
2. the cold pressed compact 10 is not powder, so that the flying of weighed dust can be avoided during blanking, no dust pollution is caused, and the environment is protected; workers do not need to painstakingly clean the scrap edges on the die, so that the labor intensity is reduced;
3. the specifications of the cold pressed compacts 10 are unified, the weight difference of each cold pressed compact 10 is controlled within +/-0.2 g, the flatness of the cold pressed compacts 10 is completely consistent, the materials are uniformly distributed, the production efficiency is high, the labor intensity is low, and the yield is high;
4. because the fit clearance of the hot-pressing die 1 is between 0.2 mm and 0.4mm, the mixture is very easy to leak out of the hot-pressing die in the original charging and transferring processes, and the cold-pressed blank 10 is placed into the hot-pressing die 1, so that powder leakage during charging is avoided, no overflow during hot pressing is avoided, and the direct utilization rate of the mixture is improved; each product can be normally produced only by 80% of the feeding amount of the original mixture, so that the cost is reduced;
5. when the grinding disc is sintered by hot pressing, the difference between the hot pressing process of the cold pressing blank 10 and the hot pressing process of the powder material is that the hot pressing process is divided into two times, the first hot pressing crushing is carried out, and the hot pressing pressure of the first hot pressing is 200-250kg/cm 2 For 3-5 s; crushing the cold pressing blank 10 into particles which are uniformly filled into a particle 11 cavity of the hot pressing die 1; and (3) second hot-pressing sintering: the hot pressing pressure of the second hot pressing is 50-100kg/cm 2 For 5-7 min; the second hot pressing is the existing hot pressing sintering process, and the crushed cold pressing blank 10 is sintered to form a grinding sheet working layer; the surface area of the cold pressed blank 10 is increased after being crushed, so that the conduction of temperature and the release of ammonia gas during softening are facilitated, hot-pressing sintering is more sufficient, the performance of the manufactured abrasive disc is more stable, and the yield is high;
6. because the non-broken cold-pressed blank 10 is a whole, the contact point of the cold-pressed blank 10 and the hot-pressing die 1 is only the ridge 12 on the hot-pressing die 1; in this case, when the hot press sintering is performed directly, only the portion contacting the rib 12 is softened by heat and then the heat is transferred to the portion not contacting the rib 12; as is known, the resin material is a poor thermal conductor, and the thermal conductivity of the resin material is 3 orders of magnitude smaller than that of the metal material, so that the cold-pressed blank 10 forms a temperature difference rapidly at the contact position with the edge 12 and the non-contact position at the middle position of the cavity of the particle 11, which causes the resin at the contact position with the edge 12 to reach the solidification point and harden, and the cold-pressed blank 10 at other positions is not softened, so that the abrasive sheet can not be formed by hot-pressing and sintering; therefore, before hot-pressing sintering, the cold-pressed blank 10 needs to be subjected to hot-pressing crushing, so that the cold-pressed blank 10 is uniformly heated, and the hot-pressed abrasive disc is high in quality;
7. the mixture is cold-pressed by a cold press, air in the mixture is removed after cold pressing, and the problem of product pores in the prior direct hot pressing of powder is solved.
The size of the cavity of the single particle 11 of the hot pressing die 1 is 5mm by 5mm, the width W of the ridge 12 of the cavity of the single particle 11 is 1mm, the span between two adjacent ridges 12 is 5mm, and the width W of the ridge 12 is as follows: the span L of the rib 12 is 1: 5.
In step 2 of the invention, the hot-pressing pressure for hot-pressing crushing is 200kg/cm 2 。
Regarding the choice of crushing pressure: since the size of the single particles 11 of the hot press die 1 is 5mm by 5mm, the ribs 12(1mm) of the die function to support the cold compact 10, i.e., the width W of the ribs 12: the edge 12 has a span L of about 1:5, under which condition a pressure of 50kg/cm is applied 2 When the die is opened, the cold pressed compact 10 has only slight indentation and is not broken; when the applied pressure is 100kg/cm 2 The cold pressed blank 10 is cracked, but still integral; when the applied pressure is 150kg/cm 2 During the process, the cold-pressed blank 10 has obvious cracks, and the partially cracked particles 11 fall into the cavities of the particles 11; when the applied pressure is 200kg/cm 2 During this time, the compact crumbles and falls into the cavity of each particle 11.
The following table specifically illustrates the degree of crushing of the cold pressed billet 10 compared with the magnitude of the pressure applied by the hot press die 1:
in step 1, the method for preparing the cold compact 10 of the present invention includes the steps of:
s1, preparing cold-pressed blank raw materials: weighing cold-pressed blank raw materials according to the weight percentage, putting the cold-pressed blank raw materials into a hopper, fully stirring for 3-5 hours, and uniformly mixing to prepare a mixture;
s2, blanking the cold-pressed blank raw materials into a material box: the hopper is connected with the spiral discharging pipe, vibrates and is matched with the spiral discharging pipe to rotate to convey a mixture to a material box of the cold press;
s3, stirring the cold-pressed blank raw materials again: the material box is internally provided with a stirrer for stirring the mixture in the material box again;
s4, blanking the cold-pressed blank raw material into a cold-pressing die cavity: the material box is horizontally pushed above the cold pressing die cavity, and the mixture in the material box falls into the cold pressing die cavity;
s5, cold pressing preparation: after the cold pressing die cavity is filled with the mixture, the plane of the cold pressing die can be lifted upwards by 3-5mm, and the plane of the mixture can be lower than the plane of the cold pressing die, so that preparation is made for simultaneously applying pressure to the upper pressing head and the lower pressing head in the next upper direction and the next lower direction;
s6, cold pressing and cold forming of blank: the cold press uses the pressure of 30-60T, the upper and lower pressure heads simultaneously apply the pressure in the upper and lower directions to the mixture, and the cold pressed blank 10 is formed by cold press;
s7, cold pressing blank demoulding: after the upper and lower pressing heads apply pressure in two directions to cold press and form the cold pressed blank 10, the upper and lower pressing heads are not loosened, the cold pressing die platform sinks, the cold pressed blank 10 is ejected out of the cold pressing die platform, and then the upper and lower pressing heads return;
s8, collecting and stacking cold-pressed blanks: a robot with 4 suction cups of 1cm diameter will automatically pick up the cold pressed compacts 10 and place them on a conveyor belt, stacked one on top of the other.
The cold pressing blank preparation method of the resin diamond abrasive disc has the advantages of high automation degree, high production efficiency, low production cost, low labor intensity, environmental protection and the like in the preparation process; the manufactured cold-pressed blank 10 has the advantages of uniform apparent density distribution, stable product performance, high yield and the like; the problems that the resin diamond abrasive disc is poor in material fluidity during cold pressing and difficult to feed, cracking is caused after cold pressing due to high air content among mixed materials, demoulding is easy to damage due to stress generated after cold pressing and the like are effectively solved; the following advantages are specified:
1. when the cold pressing blank 10 is produced, when the cold pressing blank raw material is fed, the hopper vibrates and the spiral feeding pipe is matched to rotate to convey the mixture to a material box of a cold press, the apparent density of the mixture is uniform, the density difference among the materials is reduced, the fluidity of the mixture is good, the problem that the fluidity of the resin diamond abrasive disc is poor in the cold pressing process and the feeding is difficult can be solved, the mixture can be stably conveyed to the material box of the cold press, the feeding is smooth, and the production efficiency is high; mechanical stirring and blanking are performed, so that the labor intensity is low;
2. after the mixture is conveyed to a material box of the cold press due to vibration, rotation of the screw rod and difference of material density of the mixture, the distribution of the apparent density of the mixture in the material box is changed, and the distribution is uneven; therefore, the stirrer is arranged in the material box to stir the mixture again, so that the apparent density of the mixture is redistributed uniformly, and the weight of the cold pressed blank 10 and the filling uniformity of the mixture can be stably controlled; the mechanical stirring is adopted, the blanking is uniform, and the labor intensity is low;
4. after the cold pressing die cavity is filled with the mixture, the plane of the cold pressing die can be lifted upwards by 3-5mm, and the plane of the mixture can be lower than the plane of the cold pressing die; the preparation is made for simultaneously applying pressure in the next upper direction and the lower direction, so that the mixture is prevented from being sprayed out when the pressure is applied, the production specifications of each cold pressed blank 10 are consistent, the yield is high, the dust pollution is avoided, and the environment is protected;
5. the cold press applies pressure to the upper direction and the lower direction simultaneously by using the pressure of 30-60T to perform cold pressing; if the cold-pressed blank 10 is pressed in a single direction, the density distribution of the cold-pressed blank 10 in the height direction is not uniform, so that the stress is excessively concentrated at the bottom, and the cold-pressed blank 10 is easy to crack; if the pressure is less than 30T in the two-way pressing, the compression ratio of the cold pressed compact 10 is too small, so that the cold pressed compact 10 has low strength and is easy to break; the pressure is higher than 60T, the compression ratio of the cold pressed blank 10 is too high, the density of the mixture is too high, and the mixture is difficult to break and is uniformly filled in the particles 11 of the hot pressing die 1 during later hot pressing sintering; the compression ratio of the cold pressed blank 10 should be controlled between 2 and 3 (i.e. the height ratio of the loose mixture height to the cold pressed blank 10 height), and the strength of the cold pressed blank 10 is suitable for being used in later hot-pressing sintering;
6. after the cold pressing blank 10 is formed by the two-way pressure application of the upper pressing head and the lower pressing head, the upper pressing head and the lower pressing head are not loosened, the cold pressing die platform sinks, the cold pressing blank 10 is ejected out of the cold pressing die platform, the upper pressing head and the lower pressing head return, the cold pressing blank 10 is not easy to damage, and the yield is high; if the cold compact 10 is released directly after cold compaction, re-ejection of the cold compact 10 will allow the cold compact 10 to withstand the frictional forces of demolding without protection, and the cold-compacted compact 10 will crack.
In step S1, the cold-pressed blank 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; cold blank raw materials with different formulas can be used according to different grinding sheets.
In step S2, the vibration frequency of the hopper is 100-; the hopper vibration can improve the mobility of the mixture, the mixture of the hopper is firstly moved into the feed opening of the spiral feed pipe, and the spiral rod rotates to stably convey the mixture to the material box of the cold press.
In step S3, the stirring speed of the stirrer of the material box is 300-600 revolutions/min; the distribution of the loose density in the material box is changed and is not uniform after the mixture is transmitted to the material box of the cold press due to the vibration, the rotation of the screw rod and the difference of the material density of the mixture; therefore, the stirrer is arranged in the material box and can stir the entering mixture again, so that the loose density of the mixture is uniformly distributed again, and the weight of the cold pressed blank 10 and the mixture filling uniformity can be stably controlled later.
In step S4, in the blanking process, the stirrer on the material box rotates forwards for 0.7-1.2 seconds and rotates backwards for 0.7-1.2 seconds; in order to ensure that the mixture is uniformly filled, during blanking, the stirring rotating speed of a stirrer on a material box is adjusted to 300-600 revolutions/min, the material box rotates forwards for 0.7-1.2 seconds and rotates backwards for 0.7-1.2 seconds, and the forward and reverse rotating time can be set according to the actual filling state of the mixture of each formula, so that the mixture can be fully and uniformly filled in a die cavity each time.
In step S4, the material box controls the material weight of the cold-pressed blank 10 in a constant volume manner, so as to achieve the purposes of automatic weighing and automatic scraping; within the poor controllable 0.2g of weight of cold pressed compact 10, guarantee the production specification uniformity of cold pressed compact 10, during the cold pressed compact 10 hot briquetting abrasive disc of later stage, the cloth is even, and the cloth is too many and the local problem of lacking the material when solving artifical cloth.
In step S6, the compression ratio of the cold-pressed blank 10 during cold-press molding is controlled to be 2-3; the height ratio of the height of the loose mixture to the height of the cold-pressed blank 10 is controlled to be 2-3, and the strength of the cold-pressed blank 10 is suitable for being used in later hot-pressing sintering; when the pressure of the cold press is less than 30T, the compression ratio of the cold compact 10 is too small, so that the cold compact 10 has low strength and is easy to break; when the pressure of the cold press is higher than 60T, the compression ratio of the cold pressed compact 10 is too high, the density of the mixture is too high, the mixture is difficult to break during later hot-pressing sintering, and the mixture cannot be uniformly filled in the particles 11 of the hot-pressing die 1.
In step S7, the cold pressing mold counts the cold pressing blanks 10 formed by cold pressing each time, and the production quantity is automatically accumulated; the yield can be automatically counted, the production quantity is convenient to be checked, and the management is convenient.
In step S8, the invention sets the stacking number to 10-20, and after the stacking number reaches the set number, the conveyor belt moves the position of a cold pressed blank 10 to restart stacking; the cold compact 10 can be automatically collected, and is very suitable for mass production.
The preparation method of the resin diamond abrasive disc has the advantages of high automation degree, high production efficiency, low labor intensity, high yield, stable product performance, appearance luminosity and the like, reduces the production cost, solves the environmental protection problem in the production process, automatically weighs the materials, scrapes the materials, automatically collects the cold pressed blank 10, automatically counts the yield, and is very suitable for batch production.
The above embodiments and drawings are not intended to limit the form and style of the product of the present invention, and any suitable changes or modifications thereof by one of ordinary skill in the art should be considered as not departing from the scope of the present invention.
Claims (10)
1. A preparation method of a resin diamond abrasive disc is characterized by comprising the following steps:
step 1, placing the prepared cold pressed blank into a hot-pressing die, and then placing nylon hook cloth on the cold pressed blank;
step 2, putting the hot-pressing die after die filling into a flat vulcanizing machine for hot-pressing forming;
a. hot-pressing and crushing: the hot-pressing pressure of the first hot-pressing is 200- 2 For 3-5 s; crushing the cold pressing blank into particles which are uniformly filled into a particle cavity of a hot pressing die;
b. hot-pressing and sintering: the hot pressing pressure of the second hot pressing is 50-100kg/cm 2 For 5-7 min; the second hot pressing is the existing hot pressing sintering process, and the crushed cold pressing blank is sintered into a molding abrasive disc working layer;
step 3, pressing and molding the hot-pressing mold on a flat vulcanizing machine, and opening the mold to take out the abrasive disc working layer;
and 4, gluing the back surface of the grinding sheet working layer with nylon flannelette by using glue to obtain the resin diamond grinding sheet.
2. A method of making a resin diamond grinding plate according to claim 1, wherein: the size of hot pressing die's single granule cavity is 5mm, and the width of the arris of single granule cavity is 1mm, and the span between adjacent two arris is 5mm, the width of arris: the span of the edge is 1: 5.
3. A method of making a resin diamond grinding plate according to claim 1, wherein: in step 2, the hot-pressing pressure for hot-pressing crushing is 200kg/cm 2 。
4. A method of making a resin diamond grinding plate according to claim 1, wherein: in step 1, the method for producing the cold compact comprises the following steps:
s1, preparing cold-pressed blank raw materials: weighing cold-pressed blank raw materials according to the weight percentage, putting the cold-pressed blank raw materials into a hopper, fully stirring the mixture for 3 to 5 hours, and uniformly mixing the mixture to prepare a mixture;
s2, blanking the cold-pressed blank raw materials into a material box: the hopper is connected with the spiral discharging pipe, vibrates and is matched with the spiral discharging pipe to rotate to transmit the mixture to a material box of the cold press;
s3, stirring the cold-pressed blank raw materials again: the material box is internally provided with a stirrer for stirring the mixture in the material box again;
s4, blanking the cold-pressed blank raw material into a cold-pressing die cavity: the material box is horizontally pushed above the cold pressing die cavity, and the mixture in the material box falls into the cold pressing die cavity;
s5, cold pressing preparation: after the cold pressing die cavity is filled with the mixture, the plane of the cold pressing die can be lifted upwards by 3-5mm, and the plane of the mixture can be lower than that of the cold pressing die;
s6, cold pressing and cold forming of blank: the cold press uses the pressure of 30-60T, the upper and lower pressure heads simultaneously apply the pressure of the upper and lower directions to the mixture, and the cold press is formed into a cold pressed blank;
s7, cold-pressed blank demoulding: after the upper and lower pressing heads apply pressure in two directions to form a cold pressed blank by cold pressing, the upper and lower pressing heads are not loosened, the cold pressing die platform sinks, and after the cold pressed blank is ejected out of the cold pressing die platform, the upper and lower pressing heads return;
s8, collecting and stacking cold-pressed blanks: a mechanical arm with 4 sucking discs with the diameter of 1cm can automatically suck cold pressing blanks to be placed on a conveying belt, and the cold pressing blanks are stacked together one by one.
5. The method of manufacturing a resin diamond grinding chip according to claim 4, wherein: in step S1, the cold-pressed blank raw material 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.
6. The method of manufacturing a resin diamond grinding plate according to claim 4, wherein: in step S2, the vibration frequency of the hopper is 100-.
7. The method of manufacturing a resin diamond grinding chip according to claim 4, wherein: in step S3, the stirring speed of the stirrer of the material box is 300-600 rpm.
8. The method of manufacturing a resin diamond grinding chip according to claim 4, wherein: in the step S4, in the blanking process, the stirrer on the material box rotates forwards for 0.7-1.2 seconds and rotates backwards for 0.7-1.2 seconds; and the material weight of the cold pressed blank is controlled by the material box in a constant volume mode.
9. The method of manufacturing a resin diamond grinding chip according to claim 4, wherein: in step S6, the compression ratio at the time of cold press molding of the cold compact is controlled to be between 2 and 3.
10. The method of manufacturing a resin diamond grinding chip according to claim 4, wherein: in step S7, the cold pressing mold counts the cold pressed blanks each time of cold press molding, and the production number is automatically accumulated; in step S8, the number of stacked green compacts is set to 10 to 20, and after the number of stacked green compacts reaches the set number, the conveyor moves a position of one of the cold green compacts, and the stacking is resumed.
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