CN112476244B - Superhard grinding tool dressing tool and preparation method thereof - Google Patents
Superhard grinding tool dressing tool and preparation method thereof Download PDFInfo
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- CN112476244B CN112476244B CN202011350844.0A CN202011350844A CN112476244B CN 112476244 B CN112476244 B CN 112476244B CN 202011350844 A CN202011350844 A CN 202011350844A CN 112476244 B CN112476244 B CN 112476244B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
- B24B53/12—Dressing tools; Holders therefor
- B24B53/14—Dressing tools equipped with rotary rollers or cutters; Holders therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
- B24B53/06—Devices or means for dressing or conditioning abrasive surfaces of profiled abrasive wheels
- B24B53/062—Devices or means for dressing or conditioning abrasive surfaces of profiled abrasive wheels using rotary dressing tools
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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
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- 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
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- 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
- B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
- B24D3/342—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties incorporated in the bonding agent
- B24D3/344—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties incorporated in the bonding agent the bonding agent being organic
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- 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
- B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
- B24D3/346—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties utilised during polishing, or grinding operation
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
Abstract
The invention relates to a superhard grinding tool dressing tool which is prepared from the following raw materials in percentage by mass: 30-55% of common abrasive, 10-35% of PTFE powder, 20-40% of resin powder, 5-34% of modified filler, 5-10% of reinforcing fiber material and 1-6% of coupling agent. The dressing tool has wide application range, high efficiency and low cost, and can be suitable for dressing diamond and CBN grinding wheels with various hardness binders and with the grain sizes from 45# to 20000# by using the dressing tool; the dressing efficiency is lower than 3-10min, and the dressing effect can reach 1cm2The abrasive sharpening rate on the plane is more than 98 percent.
Description
Technical Field
The invention belongs to the technical field of superhard materials, and particularly relates to a superhard grinding tool dressing tool for diamond and CBN grinding wheels in a using process, in particular to raw materials, a formula and a preparation process required by the preparation of the dressing tool.
Background
Abrasive tools, known as industrial teeth, are widely used in the precision machining industry, and with the development of the industry, the requirement for high-precision machining of superabrasive tools is higher and higher. The resin bond diamond and the cubic CBN grinding wheel have great advantages in high-precision processing, because the resin bond diamond and the CBN have relative elasticity and high self-sharpening performance, different functional fillers such as polishing materials, heat dissipation materials, conductive materials and the like can be added into the resin bond diamond and the CBN, and thus the resin bond diamond and the cubic CBN grinding wheel have unique functional application.
However, diamond and CBN wheels must have good dressing profiles to achieve high precision and high surface quality grinding, with the ability to have highly uniform throw height and uniform distribution of abrasive material. This is not only related to the performance of the binder itself, but also has a great relationship with the truer, and the physical grinding performance of the truer itself directly affects the shape dressing state of the dressed grinding wheel.
Currently, the dressing tools widely used in the industry for diamond and CBN grinding wheels are green silicon carbide grinding wheels, white corundum grinding wheels, soft iron, red copper, single-point dressing pens, diamond rollers and the like. However, the materials have a small application range, for example, a green silicon carbide and white corundum grinding wheel are generally used for finishing a coarse grinding wheel or a semi-fine grinding wheel, and the finishing effect of a fine grinding wheel and a super-fine grinding wheel is not good; the soft iron and red copper materials are easy to stick scraps when finishing the resin bond grinding wheel with large porosity, but are not beneficial to the cutting of the grinding material of the grinding wheel to be finished, the finishing efficiency of the soft iron materials is very low, particularly for the finishing of a fine-grained resin bond centerless grinding wheel, the wear of the finishing wheel is fast, and the finishing time of about 10 hours is at least required for finishing a centerless grinding wheel with the diameter of 300mm, the width of 5mm and the thickness of 100mm by using the materials. When the single-point pen is used for finishing the ceramic bond diamond grinding wheel, the abrasion is fast, the finishing precision is poor, and the high-concentration fine-grained (more than 600 meshes) ceramic bond diamond grinding wheel cannot be finished.
Disclosure of Invention
In order to solve the problems, the invention specially designs and manufactures a superhard grinding tool dressing tool (namely a dressing wheel) according to the characteristics of the diamond grinding wheel and the CBN grinding wheel, has wide application range, high efficiency and low cost, can be suitable for various hardness binders,dressing of diamond and CBN grinding wheels with grain sizes from 45# to 20000# respectively; the dressing efficiency is lower than 3-10min, and the dressing effect can reach 1cm2The abrasive sharpening rate on the plane is more than 98 percent.
In order to achieve the purpose, the invention adopts the following technical scheme:
a superhard grinding tool dressing tool is prepared from the following raw materials in percentage by mass: 30-55% of common abrasive, 10-35% of PTFE powder, 20-40% of resin powder, 5-34% of modified filler, 5-10% of reinforcing fiber material and 1-6% of coupling agent.
Specifically, the common abrasive is one or more of green silicon carbide, black silicon carbide, white corundum, brown corundum and boron carbide, and the granularity is 45-2000 #. The granularity of the common abrasive material can be 45# at the thickest and 2000# at the finest. The granularity of the common abrasive in the invention is selected according to the granularity of the grinding wheel to be repaired. Generally, the grit size of the present invention is coarser than the grit size of the wheel being dressed. The hardness of the common abrasive is lower than that of diamond and CBN (cubic boron nitride) superhard abrasives, and when the common abrasive is used for grinding with a superhard abrasive tool, a bonding agent system of the superhard abrasive tool can be damaged, so that the superhard abrasive is exposed out of the cutting edge, and the superhard abrasive cannot be damaged.
Specifically, the PTFE powder is powder with the particle size of 5-85 μm. Under the condition of hot-pressing sintering, the modified filler is added into the material, so that crystals with certain strength and brittleness can be formed, and common abrasive materials can be held.
Specifically, the resin powder is one or more of phenolic resin powder, epoxy resin powder, polyimide resin powder, organic silicon resin powder and polyester resin powder, and the particle size is 20-100 μm. The resin powder material is mainly used as a bonding agent of a system, has dispersed crystals in PTFE crystals, increases the brittleness of the whole system and has the function of assisting in bonding abrasives.
Specifically, the modified filler is one or more of glass beads, silicon dioxide, titanium dioxide and calcium carbonate. The reinforcing filler has two functions, namely, the thermal expansion coefficient of PTFE is reduced, and the strength after hot processing reaction is enhanced.
Specifically, the reinforced fiber material is glass fiber yarn or asbestos; the length-diameter ratio of the glass fiber is not higher than 10, and the diameter is less than 15 mu m.
Specifically, the coupling agent is a silane coupling agent or an organosilicon peroxide coupling agent. Such coupling can increase the adhesion between the organic and inorganic fillers.
The invention also provides a preparation method of the superhard grinding tool finishing tool, which is obtained by mixing, hot-pressing sintering and mould unloading and comprises the following steps:
1) weighing common abrasive, modified filler and coupling agent in proportion, putting the materials into a glass container, adding zirconia medium balls, putting the glass container on a rotary machine to rotate (40-100 minutes), and uniformly mixing;
2) weighing PTFE powder and resin powder in proportion, and then uniformly mixing in an air flow mixing mode; the air current mixing is a conventional material mixing mode in the field, and aims to uniformly mix powdery materials by utilizing air current, can adopt a conventional air current mixing device in the field to realize uniform mixing, and can also adopt the following devices to carry out air current mixing to realize uniform mixing:
the materials are put into a mixing barrel with the diameter of 300-800mm, the height of 300-1200mm and the continuous rotation at the rotating speed of 80rpm, meanwhile, the top of the mixing barrel is provided with 10-15 small holes with the diameter of 5-15mm, the materials are mixed by continuously introducing air flow with the flow rate of 3-10m/s from the bottom of the barrel, and the mixing time is generally 30-60 minutes;
3) and (3) uniformly mixing the products obtained in the steps 1) and 2), passing through a 100-mesh and 150-mesh screen, adding a reinforced fiber material, uniformly mixing in a three-dimensional mixer (mixing for 30 minutes), putting the mixture into a mold for hot-pressing sintering, and unloading the mold after the hot-pressing sintering is finished to obtain the superhard grinding tool dressing tool (the fiber filling dressing grinding wheel) required by the invention.
Further, the hot-pressing sintering procedure in the step 3) is as follows: heating to 120 deg.C under 2MPa within 1min, heating to 180 deg.C under 3MPa within 2min, heating to 220 deg.C under 3MPa within 2min, heating to 300 deg.C under 4MPa within 3min, heating to 380 deg.C under 4MPa within 2min, heating to 420 deg.C under 4MPa within 5min, and holding at 420 deg.C for 5 min. The hot pressing sintering process in this step is important (see table 1 for details), because the pressure and temperature rise rate can directly determine the crystallinity of PTFE and the reaction rate with other functional fillers and the discharge amount and discharge rate of small molecule gas, thereby causing the change of strength and hardness of the whole bonding system, and particularly if the pressure is high, the high molecular resin and PTFE in the mold flow out, and the gas discharge is not smooth, an uneven structure and gas holes are formed in the system, and the low pressure is not favorable for achieving the design density.
TABLE 1 procedure for hot pressing sintering process
The core of the invention is that: firstly, selecting the proportioning design of a raw material formula; and secondly, a material mixing and hot-pressing sintering forming process. The Rockwell hardness range of the finishing grinding wheel manufactured by the production process according to the formula is HR15N (30-60), and the elastic modulus of the finished sample block is 0.015-0.025 multiplied by 105And MPa, the hardness belongs to medium hardness and the elastic modulus belongs to smaller elastic modulus, so that the dressing wheel has the performance of medium hardness and hardness, has a certain brittleness, and is suitable for dressing CBN and diamond ultra-hard abrasive grinding wheels of various bonding agents with high hardness.
Compared with the prior art, the invention has the following beneficial effects:
1) according to the dressing tool (dressing grinding wheel), PTFE powder is used as a main binding agent, resin powder is used as an auxiliary modifier, and modified filler and a reinforced fiber material are added, so that the prepared dressing wheel has higher strength, larger brittleness and longer service life than a common green silicon carbide grinding wheel and a common white corundum grinding wheel;
2) the dressing tool (dressing grinding wheel) has wide application range, can dress resin bond diamond and CBN grinding wheels with all particle sizes and hardness, has high dressing efficiency, can finish the efficient dressing of the ultra-fine particle size (the particle size is lower than 1000#) grinding wheel which is difficult to dress in the industry within 3 to 5 minutes, and detects that the grinding edge rate of the dressed wheel is more than 95 percent under a high power microscope after dressing;
3) the dressing tool (dressing grinding wheel) has low cost of raw materials and low cost of used manufacturing equipment, and is beneficial to mass production and preparation; and the trimming tool can be prepared into trimming tools with different specifications and shapes and matched shapes according to different shapes of the trimming wheel, and has wide applicability.
Drawings
FIG. 1 is a schematic illustration of a dressing wheel according to the present invention, specifically sized and shaped to be of various sizes and shapes depending on the application at hand;
FIG. 2 is an SEM photograph of the internal structure of a dressing grinding wheel according to example 3 of the present invention; as can be seen from the SEM images: the boron carbide abrasive in the dressing grinding wheel has high concentration, good edge-cutting effect, sharp cutting edge and sharp dressing;
FIG. 3 is a graph showing the sharpening effect of a CBN wheel dressed with a dressing tool of comparative example 2;
FIG. 4 is a graph showing the sharpening effect of the CBN wheels dressed with the dressing tool of example 2.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the following examples, but the scope of the present invention is not limited thereto.
Example 1
A finishing tool (finishing plate) with the granularity of 120#, the length multiplied by the width multiplied by the height multiplied by 100mm multiplied by 50mm multiplied by 5mm is prepared, and the finishing tool is prepared from raw materials of common abrasive, PTFE powder, resin powder, modified filler, reinforced fiber material and coupling agent, wherein the weight percentage and the type of each raw material are detailed in Table 2.
Table 2 weight percentages and types of each raw material
| Material(s) | Particle size/diameter | Mass percent | Manufacturer/model |
| Green silicon carbide | 120# | 30 | WHITE DOVE ABRASIVES Co.,Ltd. |
| PTFE powder | 60-80μm | 15 | Shenyang science and technology Ltd |
| Phenolic resin powder | 60-80μm | 25 | Jinan holy spring group/PF-2827 |
| Silicon dioxide | 240# | 20 | Shanghai Chaowei nanotechnology Co.,Ltd. |
| Glass fiber yarn | 10μm | 5 | China giant Stone Ltd |
| Coupling agent | / | 5 | KH550 |
The preparation method of the superhard grinding tool finishing tool specifically comprises the following steps:
1) weighing common abrasive green silicon carbide, modified filler silicon dioxide and coupling agent according to a certain proportion, putting the materials into a glass container, adding a zirconium oxide medium ball with the diameter of 5mm, wherein the mass ratio of the zirconium oxide medium ball to the raw materials is 1: 10, placing on a rotary machine, rotating at the rotating speed of 400rpm for 40 minutes, and uniformly mixing;
2) weighing PTFE powder and phenolic resin powder in proportion, and then uniformly mixing in an air flow mixing mode for 30 min; the following devices can be used for air mixing: putting the materials into a mixing barrel which has the diameter of 500mm and the height of 800mm and rotates continuously at the rotating speed of 80rpm, wherein the top of the mixing barrel is provided with 10-15 small holes with the diameter of 5-15mm, and mixing the materials by continuously introducing air flow with the flow speed of 8m/s from the bottom of the barrel; the same applies below;
3) uniformly mixing products obtained in the steps 1) and 2), sieving the mixture for 3 times by using a 100-mesh sieve, adding glass fiber yarns serving as reinforced fiber materials, uniformly mixing the mixture in a three-dimensional mixer (mixing for 30 minutes), and putting the mixture into a mold for hot-pressing sintering (the hot-pressing sintering procedure is as follows in Table 1: heating to 120 ℃ within 1min under the pressure of 2MPa, heating to 180 ℃ within 2min under the pressure of 3MPa, heating to 220 ℃ within 2min under the pressure of 3MPa, heating to 300 ℃ within 3min under the pressure of 4MPa, heating to 380 ℃ within 2min under the pressure of 4MPa, heating to 420 ℃ within 5min under the pressure of 4MPa, and keeping the temperature at 420 ℃ for 5min, removing the die after the hot-pressing sintering is finished, and cooling to the natural temperature to obtain the superhard grinding tool finishing tool (fiber filling finishing plate) required by the invention.
The dressing plate can dress diamond grinding wheels with different binders with the granularity of 140#, 180#, 200# in various grades of hardness.
The dressing parameters and dressing effect of diamond grinding wheels with the specification model number of 1A 1-300X 20X 76X 10 and the grain size of 200# were dressed on an MM7120 surface grinding machine by using the dressing plate are shown in Table 3 below.
TABLE 3 dressing parameters and dressing Effect
Example 2
A finishing tool (a finishing ring, see figure 1) with the granularity of 400#, the outer diameter multiplied by the inner diameter multiplied by the height of 100mm multiplied by 80mm multiplied by 10mm is prepared, and the finishing tool is prepared from the raw materials of common abrasive, PTFE powder, resin powder, modified filler, reinforced fiber material and coupling agent, wherein the weight percentage and the type number of each raw material are detailed in table 4.
Table 4, weight percentage and type of each raw material
| Material(s) | Particle size/diameter | Mass percent | Type/manufacturer |
| White corundum | 400# | 35 | WHITE DOVE ABRASIVES Co.,Ltd. |
| PTFE powder | 30-50μm | 10 | Shenyang science and technology Ltd |
| Polyimide resin powder | 30-50μm | 30 | Jinan holy spring group |
| Calcium carbonate | 600# | 11 | Shanghai Chaowei nanotechnology Co.,Ltd. |
| Glass fiber yarn | 10μm | 10 | China giant Stone Ltd |
| Coupling agent | / | 4 | KH550 |
The preparation method of the superhard grinding tool finishing tool specifically comprises the following steps:
1) weighing common abrasive white corundum, modified filler calcium carbonate and coupling agent in proportion, putting the materials into a glass container, adding a zirconia medium ball with the diameter of 3mm, wherein the mass ratio of the zirconia medium ball to the raw materials is 1: 10, placing on a rotary machine, rotating at the rotating speed of 500rpm for 45 minutes, and uniformly mixing;
2) weighing PTFE powder and phenolic resin powder in proportion, and then uniformly mixing in an air flow mixing mode for 45 min;
3) and (3) uniformly mixing the products obtained in the steps 1) and 2), sieving the mixture for 4 times by using a 120-mesh sieve, adding glass fiber filaments serving as reinforced fiber materials, uniformly mixing the mixture in a three-dimensional mixer (mixing for 35 minutes), putting the mixture into a mold for hot-pressing sintering (the hot-pressing sintering procedure refers to the table 1), removing the mold after the hot-pressing sintering is finished, and cooling to natural temperature to obtain the superhard grinding tool finishing tool (fiber filling finishing ring) required by the invention.
The dressing ring can be used for dressing CBN grinding wheels with different binders with the granularity of 600#, 800# and various grades of hardness.
The dressing parameters and dressing effect of CBN grinding wheels with specification types of 6A 2-350X 50X 305X 10 and the granularity of 600# are dressed on a vertical shaft circular table mill by using the dressing ring are shown in the following table 5.
TABLE 5 dressing parameters and dressing Effect
Example 3
A finishing tool (finishing ring) with the granularity of 800#, the outer diameter multiplied by the inner diameter multiplied by the height of 100mm multiplied by 80mm multiplied by 10mm is prepared, and the finishing tool is prepared from raw materials of common abrasive, PTFE powder, resin powder, modified filler, reinforced fiber material and coupling agent, wherein the weight percentage and the type of each raw material are detailed in Table 6.
Table 6 weight percentages and types of each raw material
| Material(s) | Particle size/diameter | Mass percent | Type/manufacturer |
| Boron carbide | 800# | 30 | Shanghai Chaowei nanotechnology Co.,Ltd. |
| PTFE powder | 10-18μm | 20 | Shenyang science and technology Ltd |
| Polyimide resin powder | 10-20μm | 25 | Jinan holy spring group |
| Titanium dioxide | 1000# | 15 | Shanghai Chaowei nanotechnology Co.,Ltd. |
| Asbestos wool | 10μm | 9 | China giant Stone Ltd |
| Coupling agent | / | 1 | KH792 |
The preparation method of the superhard grinding tool finishing tool specifically comprises the following steps:
1) weighing a common abrasive boron carbide, a modified filler titanium dioxide and a coupling agent in proportion, putting the materials into a glass container, adding a zirconia medium ball with the diameter of 3mm, wherein the mass ratio of the zirconia medium ball to the raw materials is 1: 10, placing on a rotary machine, rotating at the rotating speed of 600rpm for 50 minutes, and uniformly mixing;
2) weighing PTFE powder and phenolic resin powder in proportion, and then uniformly mixing in an air flow mixing mode for 60 min;
3) and (3) uniformly mixing the products obtained in the steps 1) and 2), sieving the mixture by a 140-mesh sieve for 5 times, adding reinforcing fiber material asbestos filaments, uniformly mixing the mixture in a three-dimensional mixer (mixing for 35 minutes), putting the mixture into a mold for hot-pressing sintering (the hot-pressing sintering procedure refers to the table 1), removing the mold after the hot-pressing sintering is finished, and cooling to natural temperature to obtain the superhard grinding tool finishing tool (finishing ring) required by the invention.
The dressing ring can be used for dressing diamond and CBN grinding wheels with different binders with the respective grades of hardness of 1000#, 1200#, 1500 #.
The dressing ring is used for dressing a CBN grinding wheel with the specification model number of 1A 1-350X 20X 127X 10 and the grain size of 1200# on the MM1432 excircle grinding, and the dressing parameters and dressing effect are shown in the following Table 7.
TABLE 7 dressing parameters and dressing Effect
Comparative example 1
In general, a 200# diamond wheel of specification model number 1a1-300 x 20 x 76 x 10 was dressed on an MM7120 face grinder using a medium soft grade (J, K, etc.) common ceramic bond green silicon carbide or white corundum wheel of 140# or 180# grain size, with the dressing parameters and dressing effects as shown in table 8 below:
TABLE 8 dressing parameters and dressing Effect
Comparative example 2
The hot press molding of the conventional resin bond abrasive grinding wheel is performed by using a common hot press, the molding process of the common hot press can only set a fixed heating temperature for heating, the pressure and the time can be matched and adjusted, and the process of the common hot press generally sets the temperature to be 150-. A superabrasive tool dressing tool was now prepared using the same formulation as in example 2 and the hot press sintering procedure of table 9.
TABLE 9 ordinary hot press technology
| Temperature (. degree.C.) | Time (min) | Pressure (Mpa) |
| 180 | 5 | 2 |
| 180 | 5 | 4 |
| 180 | 40 | 6 |
The superhard grinding tool dressing tools (dressing rings) prepared in comparative example 2 and example 2 are respectively used for dressing a CBN grinding wheel with the specification model number of 6A 2-350X 50X 305X 10 and the grain size of 600# on a vertical shaft circular table mill, the rotating speed of the CBN grinding wheel is 1440rpm, the feeding rate is 0.2mm/min, and the dressing time is 3 min. The trimming effect is shown in fig. 3 and 4, respectively. As is evident from fig. 3 and 4: the dressing effect (abrasive edge-lifting rate and edge-lifting height) after dressing with the dressing tool of the present invention was significantly better than that of comparative example 2.
The invention provides a dressing grinding wheel tool innovatively according to the problems of low dressing efficiency, small application range of the dressing tool, sticky scraps in dressing and the like in the dressing of the existing superhard grinding wheel.
Claims (8)
1. The dressing tool for the superhard grinding tool is characterized by being prepared from the following raw materials in percentage by mass: 30-55% of common abrasive, 20-35% of PTFE powder, 20-40% of resin powder, 5-34% of modified filler, 5-10% of reinforcing fiber material and 1-6% of coupling agent;
the modified filler is one or more of glass beads, silicon dioxide, titanium dioxide and calcium carbonate; PTFE powder is used as a main bonding agent;
the dressing tool can be adapted to the dressing of diamond and CBN grinding wheels from 45# grit to 20000# grit.
2. A superabrasive dressing tool according to claim 1, wherein the common abrasive is one or more of green silicon carbide, black silicon carbide, white corundum, brown corundum and boron carbide, and has a grain size of 45# to 2000 #.
3. A superabrasive dressing tool according to claim 1 or 2, wherein the PTFE powder is a powder having a particle size of 5 to 85 μm.
4. A superabrasive dressing tool according to claim 3, wherein the resin powder is one or more of phenol resin powder, epoxy resin powder, polyimide resin powder, silicone resin powder and polyester resin powder, and has a particle diameter of 20 to 100 μm.
5. The superabrasive tool dressing tool of claim 1, wherein the reinforcing fiber material is fiberglass filaments or asbestos filaments; the length-diameter ratio of the glass fiber yarns or the asbestos yarns is not higher than 10, and the diameter of the glass fiber yarns or the asbestos yarns is less than 15 mu m.
6. The superabrasive tool dressing tool of claim 1, wherein the coupling agent is a silane coupling agent or an organosilicon peroxide coupling agent.
7. A method of making a superabrasive tool dressing tool according to any of claims 1 to 6, comprising the steps of:
1) weighing common abrasive, modified filler and coupling agent according to a certain proportion, putting the materials into a glass container, adding zirconia medium balls, putting the glass container on a rotary machine for rotation, and uniformly mixing;
2) weighing PTFE powder and resin powder in proportion, and then uniformly mixing in an air flow mixing mode;
3) and (3) uniformly mixing the products obtained in the steps 1) and 2), passing through a 100-mesh and 150-mesh screen, adding a reinforcing fiber material, uniformly mixing in a three-dimensional mixer, putting the mixture into a mold for hot-pressing sintering, and removing the mold after the hot-pressing sintering is finished.
8. The method of making a superabrasive tool of claim 7, wherein the hot press sintering procedure of step 3) is: heating to 120 deg.C under 2MPa within 1min, heating to 180 deg.C under 3MPa within 2min, heating to 220 deg.C under 3MPa within 2min, heating to 300 deg.C under 4MPa within 3min, heating to 380 deg.C under 4MPa within 2min, heating to 420 deg.C under 4MPa within 5min, and holding at 420 deg.C for 5 min.
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| CN103586793A (en) * | 2013-11-26 | 2014-02-19 | 常熟市巨力砂轮有限责任公司 | Method for preparing resin grinding wheel |
| CN103921220A (en) * | 2014-05-08 | 2014-07-16 | 武汉法山磨料磨具有限公司 | Method for preparing resin grinding wheel containing epoxy resin |
| CN106625296A (en) * | 2016-11-29 | 2017-05-10 | 磐维科技（青岛）有限公司 | Diamond grinding wheel |
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| US7628829B2 (en) * | 2007-03-20 | 2009-12-08 | 3M Innovative Properties Company | Abrasive article and method of making and using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103586793A (en) * | 2013-11-26 | 2014-02-19 | 常熟市巨力砂轮有限责任公司 | Method for preparing resin grinding wheel |
| CN103921220A (en) * | 2014-05-08 | 2014-07-16 | 武汉法山磨料磨具有限公司 | Method for preparing resin grinding wheel containing epoxy resin |
| CN106625296A (en) * | 2016-11-29 | 2017-05-10 | 磐维科技（青岛）有限公司 | Diamond grinding wheel |
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