阅读说明：本技术 一种万向节球道磨用纳米陶瓷结合剂cBN砂轮的制备方法 (Preparation method of nano ceramic bond cBN grinding wheel for universal joint ball track grinding ) 是由 杨菲 涂俊群 王凯平 于 2017-05-27 设计创作，主要内容包括：本发明提供一种万向节球道磨用纳米陶瓷结合剂cBN砂轮的制备方法。所述纳米陶瓷结合剂由SiO<Sub>2</Sub>、V<Sub>2</Sub>O<Sub>5</Sub>、Na<Sub>2</Sub>O、Al<Sub>2</Sub>O<Sub>3</Sub>、K<Sub>2</Sub>O组成,添加5%～8%纳米ZrO<Sub>2</Sub>。本发明提供的纳米陶瓷结合剂砂轮,所用结合剂与一般陶瓷结合剂的差别在于,用稀有金属氧化物V<Sub>2</Sub>O<Sub>5</Sub>替代常用的B<Sub>2</Sub>O<Sub>3</Sub>,同时添加纳米ZrO<Sub>2</Sub>,利用稀有金属氧化物能提高结合剂润湿能力的作用,提高砂轮的强度和硬度,使砂轮在保证较高的锋利性同时,具有更好的形状保持性,从而提升磨削速度和修整间隔,大大提升磨削效率和砂轮使用寿命。(The invention provides a preparation method of a nano ceramic bond cBN grinding wheel for universal joint ball track grinding. The nano ceramic bonding agent is made of SiO 2 、V 2 O 5 、Na 2 O、Al 2 O 3 、K 2 O, adding 5-8% of nano ZrO 2 . The difference between the binding agent used in the nano ceramic bond grinding wheel provided by the invention and the general ceramic bond is that rare metal oxide V is used 2 O 5 Instead of the conventional B 2 O 3 While adding nano ZrO 2 The rare metal oxide is utilized to improve the wetting capacity of the binding agent, the strength and hardness of the grinding wheel are improved, the grinding wheel has better shape retentivity while higher sharpness is ensured, and therefore, the grinding speed and the dressing interval are improved, and the grinding wheel is largeGreatly improving the grinding efficiency and prolonging the service life of the grinding wheel.)

1. A preparation method of a nanometer ceramic bond cBN grinding wheel for universal joint ball track grinding is characterized by comprising the following steps:

(1) combining a basic binder with nano-ZrO₂Uniformly mixing, heating to 1500 ℃, rapidly cooling by water, performing ball milling for 3-5 hours, drying, sieving, and selecting powder of 600-800 meshes to obtain the nano ceramic bonding agent;

(2) uniformly mixing the abrasive, the nano ceramic bonding agent, the pore-forming agent and the temporary bonding agent, drying, and sieving by a 120-mesh standard sieve to obtain a mixture; the abrasive contains cBN;

(3) dry-pressing and molding the mixture to obtain a green body; carrying out heat treatment on the green body to obtain an abrasive layer;

(4) and combining the abrasive layer with the substrate to obtain the nano ceramic binder cBN grinding wheel for the universal joint ball track grinding.

2. The method for manufacturing a nano-ceramic bond cBN grinding wheel for a universal joint ball track grinding according to claim 1, wherein the weight percentage of the basic bond is SiO₂ 45～60%、V₂O₅ 20～30%、Al₂O₃ 5～10%、Na₂O 5～16%、K₂5-10% of O; the weight percentage of the mixture is that the cBN abradant accounts for 40-60 percent, and Al₂O₃20-30% of abrasive, 15-30% of nano ceramic bonding agent, 1-5% of pore-forming agent and 5-10% of temporary bonding agent.

3. The method for preparing the nano ceramic bond cBN grinding wheel for the universal joint ball track grinding according to claim 1, wherein the nano ZrO is prepared by using a nano ceramic bond cBN grinding wheel₂The particle size of (A) is 30-50 nm; the grain size of the cBN abrasive is 100-120 mu m; the Al is₂O₃The grain size of the abrasive is 70-90 mu m; the particle size of the pore-forming agent is 50-70 mu m; the temporary bonding agentIs an epoxy resin.

4. The method for preparing the nano ceramic bond cBN grinding wheel for the universal joint ball track grinding according to claim 1, wherein the nano ZrO is prepared by using a nano ceramic bond cBN grinding wheel₂The dosage of the basic binding agent is 5 to 8 percent.

Technical Field

The invention belongs to the technical field of superhard abrasive tools, and relates to a preparation method of a nanometer ceramic bond cBN grinding wheel for universal joint ball path grinding.

Background

The ceramic cBN grinding wheel is a porous wear-resistant material with high porosity and high strength, which is formed by sintering a ceramic bonding agent and cBN grinding materials at high temperature. Compared with the common abrasive, the cBN abrasive not only has the advantages of high hardness, high thermal conductivity and good wear resistance, but also has strong thermal and chemical stability, so the cBN abrasive grinding wheel gradually becomes the first choice for high-speed and high-precision grinding.

When universal joint ball channels are ground, because the grinding allowance is large, the grinding speed is high, and each ball channel is ground in place at one time, the abrasion to the grinding wheel is serious, and the requirements on the sharpness and the shape retentivity of the grinding wheel are high. At present, the shape retentivity of the grinding wheel is poor due to the strength problem of the domestic grinding wheel, the correction interval is 1, and the grinding efficiency and the service life of the grinding wheel are seriously influenced.

Disclosure of Invention

Aiming at the defects of the prior art, the invention discloses a nano ceramic bond cBN grinding wheel for universal joint ball track grinding and a preparation method thereof₂O₅Instead of the conventional B₂O₃And adding nano ZrO in the ceramic binder₂The strength of the grinding wheel is improved while the sharpness of the grinding wheel is kept, so that the grinding speed and the correction interval are improved, the grinding efficiency is greatly improved, and the service life is greatly prolonged.

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

a nano-ceramic binder for universal joint ball track mill contains basic binder and nano-ZrO₂(ii) a The nano ZrO₂The dosage of the basic binding agent is 5 to 8 percent of that of the basic binding agent; the base binder comprises SiO₂、Al₂O₃、K₂O、Na₂O。

In the above technical scheme, the nano ZrO₂The particle size of (A) is 30-50 nm; the base binder further comprises V₂O₅. The invention limits ZrO₂Particle size of ZrO₂The reaction process with the high-temperature melt is controlled, and the final damage to the structure and the performance uniformity of the bonding agent is avoided.

In the above technical solution, the weight percentage of the basic binder is SiO₂ 45～60%、V₂O₅ 20～30%、Al₂O₃ 5～10%、Na₂O 5～16%、K₂And 5-10% of O. The invention limits the component proportion, is beneficial to the fusion and infiltration among the components, and the prepared ceramic bond has the characteristics of high hardness, good temperature resistance, good self-sharpening property, sharpness and the like, so that the service life and the processing efficiency of the trimming wheel can be greatly improved without frequently replacing the trimming wheel.

The invention also discloses a preparation method of the nano ceramic bonding agent for universal joint ball track grinding, which comprises the step of mixing the basic bonding agent and nano ZrO₂Uniformly mixing, heating to 1500 ℃, rapidly cooling by water, performing ball milling for 3-5 hours, drying, sieving, and selecting powder of 600-800 meshes to obtain the nano ceramic bonding agent; the nano ZrO₂The dosage of the basic binding agent is 5 to 8 percent of that of the basic binding agent; the base binder comprises SiO₂、Al₂O₃、K₂O、Na₂O、V₂O₅。

The invention also discloses a nano ceramic bond cBN grinding wheel for universal joint ball track grinding, which consists of a substrate and a grinding material layer; the abrasive layer comprises the nano-ceramic binder.

In the technical scheme, the grinding material layer comprises, by weight, 40-60% of cBN grinding material and Al₂O₃20-30% of abrasive, 15-30% of nano ceramic bonding agent, 1-5% of pore-forming agent and 5-10% of temporary bonding agent.

In the technical scheme, the grain size of the cBN abrasive is 100-120 mu m; the Al is₂O₃Abrasive particles having a particle size of70-90 μm; the particle size of the pore-forming agent is 50-70 mu m; the temporary bonding agent is epoxy resin.

In the ceramic bonding agent prepared by the method, silicon dioxide mainly provides a main framework consisting of silicon-oxygen tetrahedrons for the ceramic bonding agent; vanadium pentoxide and potassium oxide are used as nucleating agents; because the sodium oxide and the zirconium oxide are added into the basic raw material subsequently, the specific surface area, namely the surface activation energy, of the whole powder is increased, so that the sintering temperature, namely the refractoriness, of the ceramic bond is reduced, the strength of the ceramic bond is enhanced, and the problem that the refractoriness of the ceramic bond is improved while the strength of the ceramic bond is increased in the prior art is solved; according to the invention, the thermal expansion coefficient of the ceramic bond can be reduced through the proportion of silicon dioxide, aluminum oxide, zirconium oxide and potassium oxide, so that the thermal expansion coefficients of the sintered ceramic bond and the abrasive are matched; the grinding wheel prepared by the method has reasonable component proportion, is beneficial to fully and uniformly mixing, can fully participate in the reaction in the sintering process of manufacturing the grinding tool in the future, and improves the reaction uniformity of the ceramic bond of each part of the grinding tool.

The invention further discloses a preparation method of the nano ceramic bond cBN grinding wheel for the universal joint ball track grinding, which comprises the following steps:

(1) combining a basic binder with nano-ZrO₂Uniformly mixing, heating to 1500 ℃, rapidly cooling by water, performing ball milling for 3-5 hours, drying, sieving, and selecting powder of 600-800 meshes to obtain the nano ceramic bonding agent;

(2) uniformly mixing the abrasive, the nano ceramic bonding agent, the pore-forming agent and the temporary bonding agent, drying, and sieving by a 120-mesh standard sieve to obtain a mixture; the abrasive contains cBN;

(3) dry-pressing and molding the mixture to obtain a green body; carrying out heat treatment on the green body to obtain an abrasive layer;

(4) and combining the abrasive layer with the substrate to obtain the nano ceramic binder cBN grinding wheel for the universal joint ball track grinding.

In the above technical solution, the weight percentage of the basic binder is SiO₂ 45～60%、V₂O₅ 20～30%、Al₂O₃ 5～10%、Na₂O 5～16%、K₂5-10% of O; the weight percentage of the mixture is that the cBN abradant accounts for 40-60 percent, and Al₂O₃20-30% of abrasive, 15-30% of nano ceramic bonding agent, 1-5% of pore-forming agent and 5-10% of temporary bonding agent.

In the above technical scheme, the nano ZrO₂The particle size of (A) is 30-50 nm; the grain size of the cBN abrasive is 100-120 mu m; the Al is₂O₃The grain size of the abrasive is 70-90 mu m; the particle size of the pore-forming agent is 50-70 mu m; the temporary bonding agent is epoxy resin. The pore-forming agent is preferably an alumina hollow sphere.

In the technical scheme, in the step (2), the uniform mixing is carried out in the presence of an organic solvent; in the step (3), the pressure of the dry pressing molding is 10MPa, and the temperature is normal temperature. The heat treatment is that the temperature is raised to 350 ℃ for 3 hours, the temperature is preserved for 2 hours, the temperature is raised to 850 ℃ for 3 hours, the temperature is preserved for 2 hours, and finally the product is naturally cooled; in the step (4), the abrasive layer is combined with the substrate by using epoxy resin glue. The process has the advantages of strong operability, good stability and contribution to producing the ceramic bond grinding wheel with stable and reliable structure and performance.

The ceramic binder of the present invention contains rare metal oxide V₂O₅Glass system SiO₂-V₂O₅-Al₂O₃(ii) a And the limited amount of zirconia is added, so that the sharpness of the grinding wheel is maintained, and simultaneously, the strength of the grinding wheel is improved, the grinding speed and the correction interval are improved, the grinding efficiency is greatly improved, and the service life is greatly prolonged.

For example, the method for preparing the nano ceramic bond cBN grinding wheel for universal joint ball track grinding, disclosed by the invention, specifically comprises the following steps:

(1) mixing SiO₂、V₂O₅、Al₂O₃、Na₂O、K₂O and ZrO₂Uniformly mixing according to the weight ratio, heating to 1500 ℃ in a frit furnace, rapidly cooling by water, ball-milling for 3-5 hours, drying, sieving, and selecting powder of 600-800 meshes to obtain the required ceramic bonding agent;

(2) weighing cBN abrasive and Al according to weight ratio₂O₃Adding acetone into the abrasive binding agent, the alumina hollow spheres and the epoxy resin, stirring until the mixture is uniformly mixed, drying, and sieving the mixture through a 120-mesh standard sieve;

(3) after sieving, putting the mixture into a mold, and performing dry pressing to obtain a green body;

(4) putting the green body into an electric furnace, heating to 350 ℃ for 3 hours, preserving heat for 2 hours, heating to 850 ℃ for 3 hours, preserving heat for 2 hours, and finally cooling along with the furnace to obtain an abrasive material layer;

(5) and bonding the sintered abrasive layer with a substrate by using epoxy resin glue, and processing the cured abrasive layer on a lathe and a grinding machine according to the size requirement to finally obtain the nano ceramic binder cBN grinding wheel. The turning content is that according to a drawing, a grinding wheel base body with qualified size and meeting the requirement on precision is processed; the grinding content comprises grinding the end face and the excircle of the grinding wheel.

The invention has the following advantages:

1. the invention adopts glass system SiO containing rare metal oxide₂-V₂O₅-Al₂O₃And adding nano ZrO₂A new ceramic bonding agent is formed, the strength of the obtained bonding agent is improved, the wettability to the grinding material is good, and the shape retentivity of the prepared grinding wheel is high;

2. the ceramic bond disclosed by the invention is reasonable in composition, the sintering temperature of the bond is low, so that the grinding wheel can be sintered at low temperature, the strength of the grinding material is protected from being influenced by high temperature, and meanwhile, the energy loss is reduced;

3. the nano ceramic cBN grinding wheel prepared by the invention has higher strength while keeping sharpness, so that the shape of the grinding wheel can be kept unchanged although the grinding allowance is large when the grinding wheel grinds a universal joint ball channel, the grinding precision requirement is met, the grinding efficiency is improved, the service life is prolonged, and unexpected technical effects are achieved.

Detailed Description

The invention is further illustrated by the following examples: