Efficient accurate grinding ceramic grinding wheel for stainless steel roller and preparation method of efficient accurate grinding ceramic grinding wheel

Abstract

The invention discloses a stainless steel roller efficient accurate grinding ceramic grinding wheel and a preparation method thereof, and the stainless steel roller efficient accurate grinding ceramic grinding wheel comprises the following components in parts by weight: 100 parts of grinding material; 10-25 parts of a ceramic bonding agent; 5-20 parts of a pore forming agent; 3-6 parts of a resin binder; wherein the grinding material is a large-particle silicon carbide micro powder accumulation body prepared by adopting a ceramic bonding agent, has the characteristics of a micro grinding tool, and has three elements of the grinding material, the bonding agent and air holes, and the resin bonding agent is a mixture of low-viscosity phenolic resin liquid and alcohol in a ratio of 1: 1 or 1: 2. The grinding material provided by the invention has structural uniformity, micro-cutting-edge cutting performance, micro-crushing performance of micro-grains falling off along grain boundaries and good self-sharpening performance, a ceramic grinding wheel prepared from the grinding material has the advantages of more uniform organization structure, high strength, good shape retentivity and the like, and the grinding efficiency is greatly improved under the condition that the grinding precision is ensured. And the grinding efficiency is high, the single feed amount is large, the finishing interval is short, and the service life is long.

Description

Technical Field

[0001] The invention relates to the technical field of fine grinding rollers, and in particular to a high-efficiency fine grinding ceramic grinding wheel for stainless steel rollers and a preparation method thereof. Background Art

[0002] With the development of high-tech industries, the requirements for key parts such as rollers are getting higher and higher, and various difficult-to-process materials are constantly emerging. Roller grinding wheels have developed in recent years with the rapid development of the metallurgical industry. Nowadays, with the rapid development of the metallurgical industry in a large-scale and high-investment form and the continuous expansion of the sheet production capacity of the steel industry, the efficiency and precision requirements for repairing rollers are getting higher and higher. The production of cold-rolled and hot-rolled strips with high surface quality depends to a large extent on rollers with high surface grinding quality. Whether rollers with high precision, no chatter marks and other excellent surface processing can be obtained has become a key factor restricting its subsequent production.

[0003] In the market, resin grinding wheels are mostly used for roller grinding, mainly because the roughness of resin grinding wheels is better and its product characteristics can effectively avoid the generation of vibration marks on the workpiece surface, but its grinding efficiency is low and the single feed volume is small. Ordinary resin grinding wheels cannot achieve both high processing accuracy and high processing efficiency when processing rollers, and can no longer meet the needs of the rapid development of my country's metallurgical industry at this stage. In addition, ceramic bond grinding wheels have shown great advantages in high-efficiency grinding of rollers. After grinding, the processed surface remains good, and there are no vibration marks, wear resistance, and strong adaptability; but they are weak in the field of high-efficiency precision grinding of rollers. The reason is that fine-grained ceramic grinding wheels are prone to "black heart" phenomenon during the preparation process, and their organizational structure is dense, heat dissipation is poor, single feed volume is small, and grinding efficiency is low.

[0004] Therefore, it is necessary to propose a new stainless steel roller high-efficiency fine grinding ceramic grinding wheel and a preparation method thereof to solve the above problems. Summary of the invention

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide a ceramic grinding wheel for high-efficiency fine grinding of stainless steel rolls and a preparation method thereof.

[0006] The technical solution of the present invention is summarized as follows: The present invention discloses a high-efficiency fine grinding ceramic grinding wheel for stainless steel rolls, which comprises the following components by weight: Abrasive 100 parts Ceramic binder 10~25 parts Pore-forming agent 5~20 parts 3~6 parts of resin binder.

[0007] Preferably, the abrasive is a large-particle silicon carbide powder accumulation body prepared with a ceramic binder.

[0008] Preferably, the ceramic binder comprises 40wt%-60wt% SiO2, 10wt%-20wt% B2O3, 15wt%-25wt% Al2O3, and 5wt%-15wt% alkali metal oxides and / or alkaline earth metal oxides.

[0009] Preferably, the resin binder is a mixture of low-viscosity phenolic resin liquid (viscosity range is 100-200 mPa.s at 25° C.) and alcohol, with a ratio of 1:1 or 1:2.

[0010] Preferably, the pore-forming agent is a treated walnut shell, and the bulk density of the walnut shell is 1.2 g / cm 3 .

[0011] Accordingly, the present invention provides a method for preparing a ceramic bond stacked abrasive for high-efficiency fine grinding of a ceramic grinding wheel for stainless steel rolls, comprising the following steps: S1, mixing, firstly preparing polyvinyl alcohol and deionized water into a solution with a mass concentration of 10% in a 95°C water bath, then uniformly mixing the temporary binder and the abrasive according to the formula, mixing for 5-10 min, then adding the pore-forming agent and mixing for about 5-10 min, finally adding the ceramic binder and mixing for 5-10 min, fully mixing, and waking the material for 12 hours to obtain a ceramic binder silicon carbide micropowder stacked abrasive molding material; S2, molding, putting the molding material into a double-screw rotary extrusion granulator for granulation to obtain a piled abrasive with a uniform diameter, and the particle size range of the abrasive is F10~F20; S3, drying, sieving the prepared stacked abrasive and drying it at 80°C to 90°C to remove moisture; S4, sintering, sintering the dried silicon carbide stacked abrasive at 1100-1200° C. in a sufficient air atmosphere; S5. Screening: The sintered abrasive is cooled and screened to obtain silicon carbide stacked abrasive in a specific particle size range.

[0012] Accordingly, the present invention also provides a method for preparing a ceramic grinding wheel for high-efficiency fine grinding of a stainless steel roller, comprising the following steps: (1) Mixing: Mix the resin binder and abrasive evenly for 6 to 9 minutes, then add the pore-forming agent and mix for about 4 to 6 minutes, and finally add the ceramic binder and mix for 12 to 16 minutes. After mixing evenly, sieve the abrasive according to the particle size to avoid large particles that affect the strength of the grinding wheel embryo; (2) During molding and spreading, the press turntable speed is controlled at 40~60r / min; (3) Curing: After the grinding wheel blank is left to stand naturally for 8 to 12 hours, it is directly heated and cured at 90 to 160°C for 4 to 8 hours; (4) Sintering: The cured ceramic grinding wheel blank is sintered at 900-1000°C. The sintering temperature curve is as follows: the temperature is raised from room temperature to 450-500°C for 4 hours, and then kept at this temperature for 5-7 hours to ensure that the resin binder is completely carbonized and decomposed. The temperature is then raised to the target temperature at a rate of 0.5-1°C / min and kept at this temperature for 6-8 hours.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The ceramic grinding wheel for high-efficiency fine grinding of stainless steel rollers provided by the present invention adopts large-grained silicon carbide accumulation as abrasive, avoiding the occurrence of microcracks, uneven internal organizational structure, poor heat dissipation during grinding, small feed amount and other undesirable problems when fine-grained silicon carbide abrasive is directly added to ceramic binder to prepare fine-grained grinding wheel. The present invention first prepares a stacked abrasive with structural uniformity and micro-blade cutting performance, micro-crushing of micro-grains along grain boundaries and good self-sharpening properties by using fine-grained abrasive and ceramic binder, and then uses ceramic stacked abrasive to prepare ceramic grinding wheel, which has multiple advantages such as more uniform organizational structure, high strength, good shape retention, etc. Under the condition of ensuring grinding accuracy, it has the advantages of high grinding efficiency, large single feed amount, short dressing interval, long service life, etc. It effectively avoids the phenomenon that the grinding efficiency is not high when the resin grinding wheel is used for high-efficiency fine grinding of rollers and the grinding accuracy is not high when the ceramic grinding wheel is used for high-efficiency fine grinding of rollers. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] Embodiment 1: 30kg abrasive, 3kg ceramic binder, 4.5kg pore former, 1.5kg resin binder; wherein the abrasive is F20 ceramic stacked abrasive prepared from F400 silicon carbide and ceramic binder, and the pore former is processed walnut shell.

[0016] The resin binder and abrasive are mixed evenly for 6 minutes, and then the pore-forming agent is added and mixed for about 4 minutes, and finally the ceramic binder is added and mixed for 12 minutes. After mixing evenly, the abrasive is sieved according to the particle size to avoid the large particles of molding materials affecting the strength of the grinding wheel embryo; the press turntable speed is controlled at 40r / min during the material spreading to improve the uniformity of the material spreading; the grinding wheel embryo is naturally left to stand for 8 hours, and then directly heated and cured at 90℃ for 5 hours; the cured ceramic grinding wheel embryo is sintered at 900℃, and the sintering temperature curve is: the room temperature is raised to 450℃ after 4 hours, and the temperature is kept for 5 hours to ensure that the resin binder is completely carbonized and decomposed, and then the temperature is raised to the target temperature at a rate of 0.5℃ / min and kept for 6 hours; the grinding wheel is then processed and inspected according to national standards, such as the static balance test of the grinding wheel, the rotation strength, and the grinding of stainless steel rollers, including the surface quality of the workpiece and the consumption of the workpiece. Among them, the balance gram in the static balance test of the grinding wheel is used to characterize the uniformity of the organization of the grinding wheel. The stainless steel roller grinding process is as follows: the grinding wheel speed is 1380 rpm, the single feed amount is 15 wires, the grinding time is 15 seconds, and the feed number is 10 times.

[0017] Embodiment 2: 30kg abrasive, 3kg ceramic binder, 1.5kg pore former, 0.9kg resin binder; wherein the abrasive is F16 ceramic stacked abrasive prepared from F320 silicon carbide and ceramic binder, and the pore former is processed walnut shell.

[0018] The resin binder and abrasive are mixed evenly for 7 minutes, and then the pore-forming agent is added and mixed for about 5 minutes, and finally the ceramic binder is added and mixed for 14 minutes. After mixing evenly, the abrasive is sieved according to the particle size to avoid the large particles of molding materials affecting the strength of the grinding wheel embryo; the press turntable speed is controlled at 45r / min during the material spreading to improve the uniformity of the material spreading; the grinding wheel embryo is naturally left to stand for 10 hours, and then directly heated and cured at 100℃ for 6 hours; the cured ceramic grinding wheel embryo is sintered at 950℃, and the sintering temperature curve is: the room temperature is raised to 460℃ after 4 hours, and the temperature is kept for 5 hours to ensure that the resin binder is completely carbonized and decomposed, and then the temperature is raised to the target temperature at a rate of 0.8℃ / min and kept for 7 hours; the grinding wheel is then processed and inspected according to national standards, such as the static balance test of the grinding wheel, the rotation strength, and the grinding of stainless steel rollers, including the surface quality of the workpiece and the consumption of the workpiece. Among them, the balance gram in the static balance test of the grinding wheel is used to characterize the uniformity of the organization of the grinding wheel. The stainless steel roller grinding process is as follows: the grinding wheel speed is 1380 rpm, the single feed amount is 15 wires, the grinding time is 15 seconds, and the feed number is 10 times.

[0019] Embodiment 3: 30kg abrasive, 4.5kg ceramic binder, 3kg pore former, 1.2kg resin binder; the abrasive is F14 ceramic stacked abrasive prepared from F240 silicon carbide and ceramic binder, and the pore former is processed walnut shell.

[0020] The resin binder and abrasive are mixed evenly for 8 minutes, and then the pore-forming agent is added and mixed for about 5 minutes, and finally the ceramic binder is added and mixed for 15 minutes. After mixing evenly, the abrasive is sieved according to the particle size to avoid the large particles of molding materials affecting the strength of the grinding wheel embryo; the press turntable speed is controlled at 50r / min during the material spreading to improve the uniformity of the material spreading; the grinding wheel embryo is naturally left to stand for 11 hours, and then directly heated and cured at 120℃ for 7 hours; the cured ceramic grinding wheel embryo is sintered at 950℃, and the sintering temperature curve is: the room temperature is raised to 480℃ after 4 hours, and the temperature is kept for 6 hours to ensure that the resin binder is completely carbonized and decomposed, and then the temperature is raised to the target temperature at a rate of 1℃ / min and kept for 7 hours; the grinding wheel is then processed and inspected according to national standards, such as the static balance test of the grinding wheel, the rotation strength, and the grinding of stainless steel rollers, including the surface quality of the workpiece and the consumption of the workpiece. Among them, the balance gram in the static balance test of the grinding wheel is used to characterize the uniformity of the organization of the grinding wheel. The stainless steel roller grinding process is as follows: the grinding wheel speed is 1380 rpm, the single feed amount is 15 wires, the grinding time is 15 seconds, and the feed number is 10 times.

[0021] Embodiment 4: 30kg abrasive, 6kg ceramic binder, 4.5kg pore former, 1.5kg resin binder; wherein the abrasive is F12 ceramic stacked abrasive prepared from F180 silicon carbide and ceramic binder, and the pore former is processed walnut shell.

[0022] The resin binder and abrasive are mixed evenly for 9 minutes, and then the pore-forming agent is added and mixed for about 6 minutes, and finally the ceramic binder is added and mixed for 16 minutes. After mixing evenly, the abrasive is sieved according to the particle size to avoid the large particles of molding materials affecting the strength of the grinding wheel embryo; the press turntable speed is controlled at 60r / min during the material spreading to improve the uniformity of the material spreading; the grinding wheel embryo is naturally left to stand for 12 hours, and then directly heated and cured at 130℃ for 7 hours; the cured ceramic grinding wheel embryo is sintered at 1000℃, and the sintering temperature curve is: the room temperature is raised to 500℃ after 4 hours, and the temperature is kept for 7 hours to ensure that the resin binder is completely carbonized and decomposed, and then the temperature is raised to the target temperature at a rate of 1℃ / min and kept for 8 hours; the grinding wheel is then processed and inspected according to national standards, such as the static balance test of the grinding wheel, the rotation strength, and the grinding of stainless steel rollers, including the surface quality of the workpiece and the consumption of the workpiece. Among them, the balance gram in the static balance test of the grinding wheel is used to characterize the uniformity of the organization of the grinding wheel. The stainless steel roller grinding process is as follows: the grinding wheel speed is 1380 rpm, the single feed amount is 15 wires, the grinding time is 15 seconds, and the feed number is 10 times.

[0023] Comparative Example: 30kg abrasive, 6kg ceramic binder, 4.5kg pore-forming agent, 1.5kg resin binder; the abrasive is F180 silicon carbide, and the pore-forming agent is processed walnut shell.

[0024] The resin binder and abrasive are mixed evenly for 9 minutes, and then the pore-forming agent is added and mixed for about 6 minutes, and finally the ceramic binder is added and mixed for 16 minutes. After mixing evenly, the abrasive is sieved according to the particle size to avoid the large particles of molding materials affecting the strength of the grinding wheel embryo; the press turntable speed is controlled at 60r / min during the material spreading to improve the uniformity of the material spreading; the grinding wheel embryo is naturally left to stand for 12 hours, and then directly heated and cured at 130℃ for 7 hours; the cured ceramic grinding wheel embryo is sintered at 1000℃, and the sintering temperature curve is: the room temperature is raised to 500℃ after 4 hours, and the temperature is kept for 7 hours to ensure that the resin binder is completely carbonized and decomposed, and then the temperature is raised to the target temperature at a rate of 1℃ / min and kept for 8 hours; the grinding wheel is then processed and inspected according to national standards, such as the static balance test of the grinding wheel, the rotation strength, and the grinding of stainless steel rollers, including the surface quality of the workpiece and the consumption of the workpiece. Among them, the balance gram in the static balance test of the grinding wheel is used to characterize the uniformity of the organization of the grinding wheel. The stainless steel roller grinding process is as follows: the grinding wheel speed is 1380 rpm, the single feed amount is 15 wires, the grinding time is 15 seconds, and the feed number is 10 times.

[0025] The parameters of Examples 1, 2, 3, 4 and the comparative example are shown in Table 1 below.

[0026] Example 1 Example 2 Example 3 Example 4 Comparative Example Abrasive 30kg Abrasive 30kg Abrasive 30kg Abrasive 30kg Abrasive 30kg Ceramic binder 3kg Ceramic binder 3kg Ceramic binder 4.5kg Ceramic binder 6kg Ceramic binder 6kg Pore ​​forming agent 4.5kg Pore ​​forming agent 1.5kg Pore ​​forming agent 3kg Pore ​​forming agent 4.5kg Pore ​​forming agent 4.5kg Resin binder 1.5kg Resin binder 0.9kg Resin binder 1.2kg Resin binder 1.5kg Resin binder 1.5kg Grinding wheel rotation strength 50m / s 50m / s 50m / s 50m / s 50m / s Balanced weight Comply with national standards Comply with national standards Comply with national standards Comply with national standards Comply with national standards Workpiece consumption 0.96mm 1.00mm 1.02mm 1.24mm 0.66mm Workpiece surface condition No chatter marks, no burns, no residual stress No chatter marks, no burns, no residual stress No chatter marks, no burns, no residual stress No chatter marks, no burns, no residual stress There are vibration marks, severe burns, and residual stress Roughness 0.20mm 0.21mm 0.22mm 0.25mm 0.36mm It can be seen from the above table that under the same grinding conditions, the stainless steel high-efficiency fine grinding ceramic grinding wheel prepared by the present invention can obtain better grinding efficiency and higher grinding quality after processing the workpiece compared with the grinding wheel prepared by single silicon carbide abrasive.

[0027] Untreated silicon carbide micropowder has a tight organizational structure, poor heat dissipation during grinding, small single feed amount, short dressing interval and other defects when added to a ceramic binder to prepare a ceramic grinding wheel, resulting in low grinding efficiency. The present invention uses a ceramic binder and a fine-grained silicon carbide abrasive to prepare a large-grained ceramic binder silicon carbide stacked abrasive through mixing, molding and sintering. The abrasive has structural uniformity and micro-blade cutting performance, micro-crystal grains falling off along grain boundaries and good self-sharpening. The ceramic grinding wheel prepared with the abrasive has multiple advantages such as more uniform organizational structure, high strength, good shape retention, etc. Under the condition of ensuring grinding accuracy, it has the advantages of high grinding efficiency, large single feed amount, short dressing interval, long service life, etc.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency fine grinding ceramic grinding wheel for stainless steel rollers, characterized in that: The following components are included by weight: Abrasive 100 parts Ceramic binder 10~25 parts Pore-forming agent 5~20 parts 3~6 parts of resin binder.

2. The high-efficiency fine grinding ceramic grinding wheel for stainless steel rolls according to claim 1 is characterized in that: The abrasive is a large-particle silicon carbide powder accumulation body prepared by using a ceramic binder.

3. The high-efficiency fine grinding ceramic grinding wheel for stainless steel rolls according to claim 1 is characterized in that: The ceramic binder includes 40wt%-60wt% of SiO2, 10wt%-20wt% of B2O3, 15wt%-25wt% of Al2O3, and 5wt%-15wt% of alkali metal oxides and / or alkaline earth metal oxides.

4. The high-efficiency fine grinding ceramic grinding wheel for stainless steel rolls according to claim 1, characterized in that: The resin binder is a mixture of low-viscosity phenolic resin liquid and alcohol in a ratio of 1:1 or 1:

2. The viscosity of the low-viscosity phenolic resin liquid at 25° C. is in the range of 100-200 mPa.s.

5. The high-efficiency fine grinding ceramic grinding wheel for stainless steel rolls according to claim 1 is characterized in that: The pore-forming agent is a processed walnut shell, and the bulk density of the walnut shell is 1.2 g / cm 3 .

6. The high-efficiency fine grinding ceramic grinding wheel for stainless steel rolls according to claim 2, characterized in that: Large-grained silicon carbide powder accumulation body used for manufacturing ceramic binder preparation includes: Formula of large particle silicon carbide powder accumulation: Raw material wt% mass percentage Abrasive 80 Binder 12 Pore ​​forming agent 3 Temporary adhesive 5 Total 100 The abrasive in the above formula is silicon carbide, and the particle size range is F120~F400; The binder in the above formula is a high temperature ceramic binder including 45wt% SiO2, 5wt% B2O3, 10wt% Al2O3, 10wt% alkali metal oxide and 5wt% clay; The pore-forming agents in the above formula are PMMA and CaCO3, which are completely decomposed to generate CaO and are completely integrated into the glass phase of the ceramic binder, further improving the strength of the large-particle silicon carbide powder accumulation body; The temporary binder in the above formula is a polyvinyl alcohol aqueous solution with a mass concentration of 10%, the degree of polymerization of the polyvinyl alcohol is 1800, and the degree of alcoholysis is 95%.

7. The high-efficiency fine grinding ceramic grinding wheel for stainless steel rolls according to claim 2, characterized in that: The method for preparing a ceramic binder large-particle silicon carbide powder accumulation body comprises the following steps: S1, mixing, firstly preparing polyvinyl alcohol and deionized water into a solution with a mass concentration of 10% in a 95°C water bath, then uniformly mixing the temporary binder and the abrasive according to the formula, mixing for 5-10 min, then adding the pore-forming agent and mixing for about 5-10 min, finally adding the ceramic binder and mixing for 5-10 min, fully mixing, and waking the material for 12 hours to obtain a ceramic binder silicon carbide micropowder stacked abrasive molding material; S2, molding, putting the molding material into a double-screw rotary extrusion granulator for granulation to obtain a piled abrasive with a uniform diameter, and the particle size range of the abrasive is F10~F20; S3, drying, sieving the prepared stacked abrasive and drying it at 80°C to 90°C to remove moisture; S4, sintering, sintering the dried silicon carbide stacked abrasive at 1100-1200° C. in a sufficient air atmosphere; S5. Screening: The sintered abrasive is cooled and screened to obtain silicon carbide stacked abrasive in a specific particle size range.

8. The high-efficiency fine grinding ceramic grinding wheel for stainless steel rolls according to claim 7, characterized in that: The sintering comprises: firstly heating the temperature to 400-450°C at a heating rate of 2-3°C / min and keeping the temperature for 2-3h to ensure that the temporary binder is completely carbonized and decomposed; and then heating the temperature to 1100-1200°C at a heating rate of 1-2°C / min and keeping the temperature for 4-6h.

9. A method for preparing a ceramic grinding wheel for high-efficiency fine grinding of stainless steel rollers, characterized in that: Applied to the grinding wheel according to any one of claims 1 to 8 above, the preparation method comprises the following steps: (1) Formula design: Formula according to the following components: Abrasive 100 parts Ceramic binder 10~25 parts Pore-forming agent 5~20 parts 3~6 parts of resin binder The resin binder is a mixture of low-viscosity phenolic resin liquid and alcohol in a ratio of 1:1 or 1:2; (2) Mixing: Mix the resin binder and abrasive evenly for 6 to 9 minutes, then add the pore-forming agent and mix for about 4 to 6 minutes, and finally add the ceramic binder and mix for 12 to 16 minutes. After mixing evenly, sieve the abrasive according to the particle size to avoid large particles that affect the strength of the grinding wheel embryo. (3) During molding and spreading, the press turntable speed is controlled at 40~60r / min; (4) Curing: After the grinding wheel blank is left to stand naturally for 8 to 12 hours, it is directly heated and cured at 90 to 160°C; (5) Sintering: The cured ceramic grinding wheel blank is sintered at 900-1000°C. The sintering temperature curve is as follows: the temperature is raised from room temperature to 450-500°C after 4 hours, and then kept at this temperature for 5-7 hours to ensure that the resin binder is completely carbonized and decomposed. The temperature is then raised to the target temperature at a rate of 0.5-1°C / min and kept at this temperature for 6-8 hours.