阅读说明：本技术 一种利用微波加热成型的金刚石工具的制备工艺 (Preparation process of diamond tool formed by microwave heating ) 是由 高忠麟 舒诚 于 2021-07-05 设计创作，主要内容包括：本发明公开了一种利用微波加热成型的金刚石工具的制备工艺,包括成型粉料制备步骤、温压成型步骤、溶剂脱除步骤和脱酯烧结成型步骤；所述温压成型步骤包括以下具体步骤：S1)将所述成型粉料制备步骤制得的金刚石胎体喂料放入温压成型模具,然后将成型压板放在所述金刚石胎体喂料的表面上；S2)将压有所述成型压板的所述温压成型模具放入微波加热装置,微波加热至所述金刚石胎体喂料的温度达到100-150℃的温压成型温度,保持微波加热20-50秒,即制得金刚石胎体毛坯；所述金刚石胎体喂料含有金刚石颗粒、合金粉末和粘合剂；所述温压成型模具的材质为聚四氟乙烯,采用微波辐射加热升温速度快,加热时间短,生产效率好,并且能耗低。(The invention discloses a preparation process of a diamond tool formed by microwave heating, which comprises a forming powder preparation step, a warm-pressing forming step, a solvent removing step and a degreasing sintering forming step; the warm-pressing forming step comprises the following specific steps: s1) placing the diamond matrix feed prepared in the molding powder preparation step into a warm-pressing molding die, and then placing a molding pressing plate on the surface of the diamond matrix feed; s2) putting the warm pressing forming die pressed with the forming pressing plate into a microwave heating device, performing microwave heating until the feeding temperature of the diamond matrix reaches the warm pressing forming temperature of 100-150 ℃, and keeping the microwave heating for 20-50 seconds to obtain a diamond matrix blank; the diamond matrix feed contains diamond particles, alloy powder and a binder; the warm-pressing forming die is made of polytetrafluoroethylene, and is fast in heating speed by adopting microwave radiation, short in heating time, good in production efficiency and low in energy consumption.)

1. A preparation process of a diamond tool formed by microwave heating is characterized by comprising a forming powder preparation step, a warm-pressing forming step, a solvent removing step and a degreasing sintering forming step;

the warm-pressing forming step comprises the following specific steps:

s1) placing the diamond matrix feed prepared in the molding powder preparation step into a warm-pressing molding die, and then placing a molding pressing plate on the surface of the diamond matrix feed;

s2) putting the warm pressing forming die pressed with the forming pressing plate into a microwave heating device, performing microwave heating until the feeding temperature of the diamond matrix reaches the warm pressing forming temperature of 100-150 ℃, and keeping the microwave heating for 20-50 seconds to obtain a diamond matrix blank;

the diamond matrix feed contains diamond particles, alloy powder and a binder; the warm-pressing forming die is made of polytetrafluoroethylene.

2. A process for preparing a diamond tool shaped by microwave heating according to claim 1, wherein the pressure applied by the shaping press plate to the diamond matrix feed therebelow in step S1) is 50-100kg/cm²；

In the step S2), the warm-pressing forming die is placed on a rotating frame in a microwave heating device for heating, the heating microwave frequency is 2450MHz, and the microwave wavelength is 122 mm.

3. The process for preparing a diamond tool shaped by microwave heating according to claim 1, wherein the step of preparing the shaped powder material comprises the following specific steps:

p1) weighing the diamond metal matrix powder and the binder respectively according to the proportion, adding the diamond metal matrix powder and the binder into a mixing roll, stirring, heating to the mixing temperature, mixing for 1 hour, and cooling to the room temperature to obtain a mixed material;

p2) crushing the mixed material by a crusher to obtain the diamond matrix feed;

the diamond metal matrix powder contains the diamond particles and the alloy powder, and the alloy powder contains molybdenum metal powder or tungsten metal powder.

4. A process for manufacturing a diamond tool shaped by microwave heating according to claim 3, wherein in step P1), the content of the diamond metal matrix powder and the binder are 85-90% and 10-15% respectively, calculated by mass;

the binder comprises a water-soluble solvent and a water-insoluble thermoplastic resin, wherein the mass ratio of the water-soluble solvent to the thermoplastic resin is 1-2: 10;

the water-soluble solvent is at least one of polyethylene glycol, aliphatic vinyl ester, glycerin fatty acid ester, polyvinyl butyral, polyvinyl methyl ether, polyvinyl ethyl ether and vinyl acrylate;

the thermoplastic resin is at least one of acrylate, vinyl polyvinyl acetate, polymethyl methacrylate, polybutyl methacrylate and polyformaldehyde; the thermoplastic resin has a polar molecular structure that resonates with microwaves.

5. The process for preparing a diamond tool formed by microwave heating as claimed in claim 3, wherein in step P1), the mixing temperature is 130-160 ℃;

in step P2), the grain size of the prepared diamond matrix feed is less than 3 mm.

6. A process for manufacturing a diamond tool shaped by microwave heating according to claim 1, wherein the solvent removal step comprises the following steps:

t1) putting the blank prepared in the step S2) into a degreasing solvent at 40-50 ℃, soaking, taking out and drying to obtain the degreased blank.

7. The process for manufacturing a diamond tool shaped by microwave heating according to claim 6, wherein in the step T1), the soaking time is 5 to 10 hours; the degreasing solvent is at least one of purified water and alcohol.

8. The process for preparing a diamond tool shaped by microwave heating according to claim 6, wherein the step of degreasing sintering shaping comprises the following specific steps:

m1) putting the degreased blank prepared in the step T1) into a vacuum sintering furnace, heating to 500 ℃ at a heating rate of 50 ℃/h, and keeping the temperature for 1 h;

m2), introducing inert gas for pressurization, then heating to the sintering temperature at the heating rate of 250 ℃/h, and keeping the temperature for 0.5 h;

m3) cooling to below 100 ℃, discharging, standing, cooling for 24 hours and homogenizing to finish the preparation of the diamond tool.

9. The process for manufacturing a diamond tool shaped by microwave heating according to claim 8, wherein in the step M2), the vacuum pressure for vacuum pumping is 10MPa, the sintering temperature is 900 ℃, and the inert gas is argon.

Technical Field

The invention relates to the technical field of diamond tools, in particular to a preparation process of a diamond tool formed by microwave heating.

Background

The heating mode of dry powder warm compaction of the diamond tool in the prior art comprises the following steps: resistance-type warm-pressing heating, hot oil formula heating and hot gas formula warm-pressing heating all heat metal mold, then through heat-conducting mode again to diamond powder transfer heat, carry out the shaping after reaching the temperature of settlement, the rate of heating of these modes is slow, hot homogeneity is poor to equipment is bulky, metal mold and equipment have consumed a large amount of heat energy, have the defect that inefficiency, energy consumption are big.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a preparation process for forming a diamond tool by using microwave to perform radiation heating, which has low energy consumption and high efficiency.

In order to achieve the purpose, the invention adopts the following technical scheme:

a preparation process of a diamond tool formed by microwave heating comprises a forming powder preparation step, a warm-pressing forming step, a solvent removal step and a degreasing sintering forming step;

the warm-pressing forming step comprises the following specific steps:

s1) placing the diamond matrix feed prepared in the molding powder preparation step into a warm-pressing molding die, and then placing a molding pressing plate on the surface of the diamond matrix feed;

s2) putting the warm pressing forming die pressed with the forming pressing plate into a microwave heating device, performing microwave heating until the feeding temperature of the diamond matrix reaches the warm pressing forming temperature of 100-150 ℃, and keeping the microwave heating for 20-50 seconds to obtain a diamond matrix blank;

the diamond matrix feed contains diamond particles, alloy powder and a binder; the warm-pressing forming die is made of polytetrafluoroethylene.

Specifically, in the step S1), the pressure of the diamond matrix feed applied to the lower part by the forming pressure plate is 50-100kg/cm 2;

in the step S2), the warm-pressing forming die is placed on a rotating frame in a microwave heating device for heating, the heating microwave frequency is 2450MHz, and the microwave wavelength is 122 mm.

Further, the preparation method of the molding powder comprises the following specific steps:

p1) weighing the diamond metal matrix powder and the binder respectively according to the proportion, adding the diamond metal matrix powder and the binder into a mixing roll, stirring, heating to the mixing temperature, mixing for 1 hour, and cooling to the room temperature to obtain a mixed material;

p2) crushing the mixed material by a crusher to obtain the diamond matrix feed;

the diamond metal matrix powder contains the diamond particles and the alloy powder, and the alloy powder contains molybdenum metal powder or tungsten metal powder.

In the step P1), the content of the diamond metal matrix powder and the content of the binder are respectively 85-90% and 10-15% by mass percent;

the adhesive comprises a water-soluble solvent and a water-insoluble thermoplastic resin, wherein the mass ratio of the water-soluble solvent to the thermoplastic resin is 1-2:10

The water-soluble solvent is at least one of polyethylene glycol, aliphatic vinyl ester, glycerin fatty acid ester, polyvinyl butyral, polyvinyl methyl ether, polyvinyl ethyl ether and vinyl acrylate;

the thermoplastic resin is at least one of acrylate, vinyl polyvinyl acetate, polymethyl methacrylate, polybutyl methacrylate and polyformaldehyde; the thermoplastic resin has a polar molecular structure that resonates with microwaves.

Further, in the step P1), the mixing temperature is 130-160 ℃;

in step P2), the grain size of the prepared diamond matrix feed is less than 3 mm.

Further, the solvent removal step comprises the following steps:

t1) putting the blank prepared in the step S2) into a degreasing solvent at 40-50 ℃, soaking, taking out and drying to obtain the degreased blank.

Specifically, in the step T1), the soaking time is 5-10 hours; the degreasing solvent is at least one of purified water and alcohol.

Further, the step of degreasing, sintering and molding comprises the following specific steps:

m1) putting the degreased blank prepared in the step T1) into a vacuum sintering furnace, heating to 500 ℃ at a heating rate of 50 ℃/h, and keeping the temperature for 1 h;

m2), introducing inert gas for pressurization, then heating to the sintering temperature at the heating rate of 250 ℃/h, and keeping the temperature for 0.5 h;

m3) cooling to below 100 ℃, discharging, standing, cooling for 24 hours and homogenizing to finish the preparation of the diamond tool.

Specifically, in the step M2), the vacuum pressure of the vacuum pumping is 10MPa, the sintering temperature is 900 ℃, and the inert gas is argon.

The technical scheme of the invention has the beneficial effects that: according to the preparation process of the diamond tool formed by microwave heating, the adopted warm-pressing forming die is made of polytetrafluoroethylene, has the characteristic of microwave penetrability, and has better high temperature resistance, corrosion resistance and heat preservation performance; the surface friction coefficient of a warm-pressing forming die made of polytetrafluoroethylene is extremely low, the pressure transmissibility is good, the demolding performance is good, and the shape of the formed blank is kept complete after demolding; the temperature of the microwave heating is 100-150 ℃, the microwave heating time is 20-50 seconds, the heating speed is high, the heating time is short, the production efficiency is good, and the energy consumption is low.

The shape and size of the inner cavity of the warm-pressing forming die can be set according to the appearance design size of the tool, and the warm-pressing forming die made of polytetrafluoroethylene is low in processing and forming difficulty.

The invention effectively solves the technical problems of low efficiency and high energy consumption of the dry powder warm-pressing forming process of the diamond tool in the prior art.

Drawings

FIG. 1 is a schematic structural view of a warm pressing mold made of PTFE according to an embodiment of the present invention before molding;

fig. 2 is a schematic structural diagram of the warm-pressing mold shown in fig. 1 after molding.

Detailed Description

The following examples are illustrative only and are not to be construed as limiting the invention.

The technical scheme of the invention is further explained by combining the attached figures 1-2 and the specific implementation mode.

A preparation process of a diamond tool formed by microwave heating comprises a forming powder preparation step, a warm-pressing forming step, a solvent removal step and a degreasing sintering forming step;

the warm-pressing forming step comprises the following specific steps:

s1) placing the diamond matrix feed prepared in the molding powder preparation step into a warm-pressing molding die, and then placing a molding pressing plate on the surface of the diamond matrix feed;

s2) putting the warm pressing forming die pressed with the forming pressing plate into a microwave heating device, performing microwave heating until the feeding temperature of the diamond matrix reaches the warm pressing forming temperature of 100-150 ℃, and keeping the microwave heating for 20-50 seconds to obtain a diamond matrix blank;

the diamond matrix feed contains diamond particles, alloy powder and a binder; the warm-pressing forming die is made of polytetrafluoroethylene.

According to the preparation process of the diamond tool formed by microwave heating, the adopted warm-pressing forming die is made of polytetrafluoroethylene, has the characteristic of microwave penetrability, and has good high temperature resistance, corrosion resistance and heat preservation performance; the surface friction coefficient of a warm-pressing forming die made of polytetrafluoroethylene is extremely low, the pressure transmissibility is good, the demolding performance is good, and the shape of the formed blank is kept complete after demolding; the temperature of the microwave heating is 100-150 ℃, the microwave heating time is 20-50 seconds, the heating speed is high by adopting microwave radiation heating, the heating time is short, the production efficiency is good, and the energy consumption is low.

The shape and size of the inner cavity of the warm-pressing forming die can be set according to the appearance design size of the tool, and the warm-pressing forming die made of polytetrafluoroethylene is low in processing and forming difficulty.

Fig. 1 and 2 show a warm-pressing mold made of polytetrafluoroethylene, and the state before and after molding.

Specifically, in the step S1), the pressure of the diamond matrix feed applied to the lower part by the forming pressure plate is 50-100kg/cm²；

In the step S2), the warm-pressing forming die is placed on a rotating frame in a microwave heating device for heating, the heating microwave frequency is 2450MHz, and the microwave wavelength is 122 mm.

The warm-pressing forming die filled with the diamond matrix feed is placed on a rotating frame of a microwave heating device for heating, the diamond matrix feed absorbs microwave energy in rotation, so that the diamond matrix feed is heated more uniformly, and the condition that the formed blank is not uniformly cured due to uneven temperature distribution of the diamond matrix feed is avoided.

Molding at 100-150 deg.C under warm pressure, and applying 50-100kg/cm²The pressure of the pressure is that the gaps between the diamond matrix feeds in a molten state are filled, and air in the gaps is completely removed, so that the prepared blank is uniform in inner parts and has no holes, and the diamond particle holding strength is better.

In the dry pressing process in the prior art, because the pressure transmission of the diamond powder in the die is not uniform, the shrinkage of a sintered diamond matrix is not uniform, and the generated shape is enlarged, so that the dry pressing process in the prior art is not suitable for forming diamond powder blanks with complex shapes, and has the defects of large deformation and short service life.

The invention relates to a process for preparing a diamond tool by microwave heating molding, wherein a diamond matrix feeding material formed by warm pressing contains a bonding agent, when the heating temperature reaches the plastic weakening and flowing temperature of the bonding agent, the diamond matrix feeding material under the action of pressure and the bonding agent are weakened and flow in a die, so that the pressure can be effectively transmitted to each part of the die, the diamond matrix feeding material is uniformly distributed and has no air holes, the whole shrinkage of a blank after sintering is uniform, and the dimensional precision is high.

Further, the preparation method of the molding powder comprises the following specific steps:

p1) weighing the diamond metal matrix powder and the binder respectively according to the proportion, adding the diamond metal matrix powder and the binder into a mixing roll, stirring, heating to the mixing temperature, mixing for 1 hour, and cooling to the room temperature to obtain a mixed material;

p2) crushing the mixed material by a crusher to obtain the diamond matrix feed;

the diamond metal matrix powder contains the diamond particles and the alloy powder, and the alloy powder contains molybdenum metal powder or tungsten metal powder.

The diamond metal matrix powder and the binder are uniformly dispersed by heating and mixing, and the diamond metal matrix powder is formed after crushing.

The proportion and the grain diameter of the diamond grains contained in the diamond metal matrix powder can be designed according to the performance requirements of specific diamond tools; the alloy powder contains molybdenum metal or tungsten metal powder, and the required alloy components can be designed according to the heat-resisting requirement and the hardness and the characteristics of the cut material.

Specifically, in the step P1), the content of the diamond metal matrix powder and the content of the binder are 85-90% and 10-15% respectively, calculated by mass percent;

the binder comprises a water-soluble solvent and a water-insoluble thermoplastic resin, wherein the mass ratio of the water-soluble solvent to the thermoplastic resin is 1-2: 10;

the water-soluble solvent is at least one of polyethylene glycol, aliphatic vinyl ester, glycerin fatty acid ester, polyvinyl butyral, polyvinyl methyl ether, polyvinyl ethyl ether and vinyl acrylate;

the thermoplastic resin is at least one of acrylate, vinyl polyvinyl acetate, polymethyl methacrylate, polybutyl methacrylate and polyformaldehyde; the thermoplastic resin has a polar molecular structure that resonates with microwaves.

Bonding the diamond metal matrix powder into a whole through a bonding agent in the warm compaction forming process; the binder with the mass percentage of 10-15% can ensure the bonding effect of the diamond metal matrix powder, and can not be too much or too little, thereby reducing the difficulty of removing the solvent and degreasing in the later period.

Water-insoluble thermoplastic resins such as acrylate (VA), ethylene-based polyvinyl acetate (EVA), polymethyl methacrylate (PMMA), polybutyl methacrylate (PBMA), Polyoxymethylene (POM), and the like, all contain polar molecular structures that resonate with microwaves, and can absorb electromagnetic waves radiated by a microwave heater to soften and have good viscosity, thereby improving the tensile strength of the bonded diamond metal matrix powder.

The water-soluble polyethylene glycol, aliphatic vinyl ester, glycerin fatty acid ester, polyvinyl butyral, polyvinyl methyl ether, polyvinyl ethyl ether or vinyl acrylate is used as a solvent, so that the residual solvent can be volatilized after bonding, water or ethanol and the like can be used for dissolving and removing easily before sintering and forming, the removing difficulty is low, the residual quantity after removing is small, and the service life of the prepared diamond tool can be maintained better.

Further, in the step P1), the mixing temperature is 130-160 ℃;

in step P2), the grain size of the prepared diamond matrix feed is less than 3 mm.

At a temperature range of 130 ℃ and 160 ℃ which is slightly higher than the plastic weakening flow temperature of the thermoplastic resin, the thermoplastic resins such as acrylate (VA), vinyl polyvinyl acetate (EVA), polymethyl methacrylate (PMMA), polybutyl methacrylate (PBMA) and Polyformaldehyde (POM) are in a molten state and are easier to disperse.

The diamond matrix with the granularity less than 3mm has better dispersibility after being fed and mixed and higher strength after being bonded.

Further, the solvent removal step comprises the following steps:

t1) putting the blank prepared in the step S2) into a degreasing solvent at 40-50 ℃, soaking, taking out and drying to obtain the degreased blank.

And the residual water-soluble solvent in the blank is removed through the solvent removal step, so that the influence of the residual water-soluble solvent on the performance and the service life of the manufactured diamond tool is avoided.

Specifically, in the step T1), the soaking time is 5-10 hours; the degreasing solvent is at least one of purified water and alcohol.

The solvent selected in the adhesive is a water-soluble solvent, residual solvent can be removed by soaking in purified water or alcohol, the solvent in the blank can be fully separated out by soaking for 5-10 hours, and the adhesive is simple and convenient to operate and low in cost.

Further, the step of degreasing, sintering and molding comprises the following specific steps:

m1) putting the degreased blank prepared in the step T1) into a vacuum sintering furnace, heating to 500 ℃ at a heating rate of 50 ℃/h, and keeping the temperature for 1 h;

m2), introducing inert gas for pressurization, then heating to the sintering temperature at the heating rate of 250 ℃/h, and keeping the temperature for 0.5 h;

m3) cooling to below 100 ℃, discharging, standing, cooling for 24 hours and homogenizing to finish the preparation of the diamond tool.

By step M1), the remaining water soluble and water insoluble binders in the degreased blank are removed.

Sintering at 900 deg.c in inert gas atmosphere and maintaining for 0.5 hr to avoid oxidation of diamond grains and alloy powder and to fuse diamond grains and alloy powder coated on the surface of diamond grains and alloy powder.

Specifically, in the step M2), the vacuum pressure of the vacuum pumping is 10MPa, the sintering temperature is 900 ℃, and the inert gas is argon.

The alloy powder adhesive body in the degreased blank can be weakened and weakened after heat preservation for 1 hour at 500 ℃, and the compactness of the inner part of the degreased blank is further improved.

The inert gas may be argon, helium, or other gas that does not chemically react with graphite at high temperatures for many weeks.

Under the conditions of high temperature and high pressure of 900 ℃ and 10MPa and no oxygen, carbon molecules on the surfaces of the diamond particles are subjected to chemical reaction to form a molybdenum carbide alloy film or a tungsten carbide alloy film, so that the holding force of the diamond particles in the diamond tool can be further improved, and the cutting efficiency and the service life are better.

Examples

1. The diamond saw blades of each example and each comparative example were prepared according to the raw material components and the process parameters listed in the following tables 1 and 2, and the weight of the blank and the test results for each example and each comparative example are shown in tables 1 and 2, respectively.

2. The preparation of the diamond tools of each example and each comparative example comprises a molding powder preparation step, a warm-pressing molding step, a solvent removal step and a degreasing sintering molding step.

The preparation method of the molding powder comprises the following specific steps:

p1) weighing the diamond metal matrix powder and the binder respectively according to the proportion, adding the diamond metal matrix powder and the binder into a mixing roll, stirring, heating to the mixing temperature, mixing for 1 hour, and cooling to the room temperature to obtain a mixed material;

p2) crushing the mixed material by a crusher to obtain the diamond matrix feed;

the diamond metal matrix powder contains the diamond particles and the alloy powder, and the alloy powder contains molybdenum metal powder or tungsten metal powder.

Wherein, the warm-pressing forming step comprises the following specific steps:

s1) placing the diamond matrix feed prepared in the molding powder preparation step into a warm-pressing molding die, and then placing a molding pressing plate on the surface of the diamond matrix feed;

s2) putting the warm pressing forming die pressed with the forming pressing plate into a heating device, heating until the feeding temperature of the diamond matrix reaches the warm pressing forming temperature, and keeping for a period of time to obtain a diamond matrix blank;

the diamond matrix feed contains diamond particles, alloy powder and a binder;

also, the solvent removal step comprises:

t1) putting the blank prepared in the step S2) into a degreasing solvent at 40-50 ℃, soaking, taking out and drying to obtain the degreased blank.

In addition, the step of degreasing, sintering and molding comprises the following specific steps:

m1) putting the degreased blank prepared in the step T1) into a vacuum sintering furnace, heating to 500 ℃ at a heating rate of 50 ℃/h, and keeping the temperature for 1 h;

m2), introducing inert gas for pressurization, then heating to the sintering temperature at the heating rate of 250 ℃/h, and keeping the temperature for 0.5 h;

m3) cooling to below 100 ℃, discharging, standing, cooling for 24 hours and homogenizing to finish the preparation of the diamond tool.

3. The heating time of each example and each comparative example is recorded, whether the blank quality after warm compaction is qualified or not is detected and confirmed, and the energy consumption and the detection result of each comparative example and each comparative example are detailed in the following tables 1 and 2 respectively.

TABLE 1 data and test results for the examples

TABLE 2 data and test results relating to the comparative examples

Comparative analysis according to the above data is as follows:

1. the diamond saw blades prepared in examples 1 to 5 and comparative examples 1 and 2 were all acceptable; the process for manufacturing the diamond tool shaped by microwave heating according to the present invention is shown to be effective.

2. Comparative examples 1 and 2 are different from corresponding examples 1 and 2 only in that the heating device and the heating source used for warm compaction are different; the muffle furnace of the prior art used in comparative examples 1 and 2, heated by a resistance wire; examples 1 and 2 used a microwave oven having a rotary heating rack, and the heating source was a microwave having a wavelength of 122mm and a frequency of 2450 MHz;

the energy consumption of comparative example 1 is 500kVA, the energy consumption of example 1 is 6.67kVA, the energy consumption of example 1 is 1.67 percent of the energy consumption of comparative example 1, and the energy saving is 98.33 percent;

the energy consumption of comparative example 2 is 750kVA, the energy consumption of example 2 is 9.72kVA, and the energy consumption of example 2 is 1.94% of the energy consumption of comparative example 2, and the energy saving is 98.06%.

The warm-pressing forming process adopted by the preparation process of the diamond tool formed by microwave heating has a very low energy consumption level, the energy-saving efficiency is improved by 98% compared with the resistance-type warm-pressing heating process of a muffle furnace in the prior art, the heating time of the warm-pressing forming is not more than 1 minute, and the production efficiency is very high.

3. Comparative examples 3 and 4 are different from example 5 in that the platen pressure used in warm compaction is different, and the platen pressures of comparative examples 3 and 4 are 110kg/cm, respectively²And 30kg/cm²All exceed 50-100kg/cm²A range of (d); the pressure of comparative example 3 is too high, so that the size of the blank prepared in comparative example 3 is too small to be qualified; the pressure of comparative example 4 was insufficient, resulting in that the size of the blank obtained in comparative example 4 was too large and failed, and the diamond saw blade obtained was loose during the cutting test due to insufficient weakening and dispersion of the adhesive, therefore, the pressure of the warm press molding of the present invention was set to 50 to 100kg/cm²The range of (1) is preferable.

4. Comparative examples 5 and 6 are different from those in the warm compaction in the microwave heating time, and the microwave heating time of comparative example 5 and comparative example 6 is 60 seconds and 10 seconds, respectively, both exceeding the range of 20 to 50 seconds; the heating time of the comparative example 5 is too long, so that the temperature of warm compaction is too high to exceed 150 ℃, the solvent of the blank of the comparative example 5 in the warm compaction is volatilized too fast, the bonding effect is poor, and the diamond saw blade prepared by the comparative example 5 is unqualified due to the poor holding force of the diamond particles and the phenomenon that the diamond particles are loosened in a cutting experiment; the heating time of comparative example 6 is too short, resulting in that the temperature of warm compaction is too low, only 95 ℃ is less than 100 ℃, resulting in poor flowability and poor adhesion of the thermoplastic resin of the blank of comparative example 6 during warm compaction, and thus the diamond saw blade manufactured by comparative example 6 is not qualified due to insufficient holding force of the diamond particles and the phenomenon of loosening of the diamond particles during cutting experiments, and therefore, it is preferable to set the microwave heating time of warm compaction to the range of 20 to 50 seconds.

In summary, in the preparation process of the diamond tool by microwave heating molding, the adopted material of the warm-pressing molding die is polytetrafluoroethylene, the warm-pressing molding die has the characteristic of penetration of microwaves, the heating speed is high by adopting microwave radiation heating, the heating time is short, the production efficiency is good, and the energy consumption is low.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

The technical principle of the present invention is described above in connection with specific embodiments. The description is only intended to explain the principles of the invention; and should not be construed as limiting the scope of the invention in any way. Based on the explanations herein; other embodiments of the invention will occur to those skilled in the art without the exercise of inventive faculty; all of which fall within the scope of the present invention.