Resin CBN grinding wheel for grinding high-speed steel roller and preparation method thereof

Abstract

The invention provides a resin CBN grinding wheel for grinding a high-speed steel roller and a preparation method of the resin CBN grinding wheel. The CBN grinding wheel comprises the following raw materials in parts by weight: 30-40 parts of polyimide modified phenolic resin, 20-30 parts of a CBN grinding material with the particle size of 60 #-180 #, 20-40 parts of an auxiliary material and 5-10 parts of a pore forming agent. An integrated compression molding and double-sided pressurizing process is adopted for preparation. The prepared CBN grinding wheel is high in strength, large in porosity and high in porosity, high-efficiency and high-precision grinding machining can be conducted on the high-speed steel roller, and the problems that in the grinding machining process of the high-speed steel roller, the machining efficiency is low, the workpiece surface quality is poor, the grinding wheel adaptability is poor, and the service life is short are solved.

Description

Technical Field

[0001] The invention relates to the technical field of resin grinding wheel preparation, in particular to a resin CBN grinding wheel for grinding a high-speed steel roller and a preparation method thereof. Background Art

[0002] With the development of rolling technology, high-speed steel rolls have become the development trend of rolls for plate and strip rolling. High-speed steel rolls have the characteristics of high wear resistance, good impact resistance, and strong roll surface retention. The use of high-speed steel rolls can reduce the number of roll grinding and dressing, extend the rolling mileage, and ultimately increase production and reduce roll consumption costs. However, due to the high hardness, high wear resistance and extremely high static friction coefficient of high-speed steel rolls, it brings certain difficulties to the grinding quality control of rolls, which puts higher requirements on the grinding performance of the grinding wheel.

[0003] At present, the grinding wheels for grinding high-speed steel rolls on the market are mainly ordinary corundum grinding wheels. During the high-speed grinding of high-hardness and high-wear-resistant materials such as high-speed steel, this type of grinding wheel is prone to problems such as poor grinding wheel shape retention and rapid shedding of grinding wheel abrasive particles, resulting in the roll shape not meeting the requirements and short service life of the grinding wheel. Summary of the invention

[0004] The present invention provides a resin CBN grinding wheel for grinding high-speed steel rolls and a preparation method thereof. The grinding wheel has high strength, large pores and high porosity, and can perform high-speed steel roll grinding with high efficiency and high precision, thereby solving the problems of low processing efficiency, poor workpiece surface quality, poor adaptability of the grinding wheel and short service life during the grinding process of the high-speed steel roll.

[0005] The technical solution of the present invention is implemented as follows: a resin CBN grinding wheel for grinding high-speed steel rolls comprises the following raw materials in parts by weight: 30-40 parts of polyimide-modified phenolic resin, 20-30 parts of CBN abrasive with a particle size of 60#-180#, 20-40 parts of auxiliary materials and 5-10 parts of pore-forming agent.

[0006] Furthermore, the auxiliary material is one or more of zinc oxide, chromium oxide, iron oxide, silicon carbide, white corundum, graphite, copper powder, and carbon fiber.

[0007] Furthermore, the auxiliary materials include 4 parts of ferric oxide, 8 parts of silicon carbide, 5 parts of graphite, 5 parts of copper powder, and 3 parts of carbon fiber.

[0008] Furthermore, the auxiliary materials include 2 parts of ferric oxide, 4 parts of silicon carbide, 5 parts of graphite, 5 parts of copper powder, 3 parts of carbon fiber, 2 parts of zinc oxide, and 9 parts of white corundum.

[0009] Furthermore, the auxiliary materials include 3 parts of chromium oxide, 4 parts of silicon carbide, 4 parts of graphite, 4 parts of copper powder, 5 parts of carbon fiber, and 3 parts of zinc oxide.

[0010] Furthermore, the pore-forming agent is one or both of hollow alumina spheres and glass microspheres.

[0011] The preparation method of the resin CBN grinding wheel for grinding high-speed steel rolls comprises the following steps:

[0012] a. Put the polyimide-modified phenolic resin, abrasive and auxiliary materials into a three-dimensional mixer and stir and mix them to obtain a mixture;

[0013] b. Put the mixed material into a mold, and use a hot press to press it on both sides and form it into an integrated form to obtain a prefabricated grinding wheel;

[0014] c. The prefabricated grinding wheel in step b is cured, and the curing process is: 40-60°C for 1 hour, 70-90°C for 1 hour, 100-120°C for 2 hours, 130-150°C for 2 hours, 160-190°C for 2 hours, and 190-220°C for 10 hours;

[0015] d. Processing the grinding wheel blank cured in step c to a desired grinding wheel size accuracy to obtain a resin CBN grinding wheel for grinding high-speed steel rolls.

[0016] Furthermore, in step d, the solidified grinding wheel blank is first processed by a CNC lathe to the required grinding wheel size accuracy; then the processed grinding wheel is assembled and matched with the flange by fastening screws, and the grinding wheel size accuracy is processed by a CNC machine tool.

[0017] Furthermore, in step b, a hot press is used to press and form the product at 220° C. for 3-5 hours.

[0018] Beneficial effects of the present invention:

[0019] The CBN grinding wheel prepared by the present invention greatly improves the cutting sharpness and the durability of the grinding wheel self-sharpening, and well balances the relationship between the cutting sharpness and the service life of the grinding wheel; it has a large grinding wheel use linear speed and a high porosity, the surface of the ground high-speed steel roller has no chatter marks or burns, the grinding effect is stable, and the service life is long.

[0020] The CBN grinding wheel prepared by the present invention has a structure with large pores and high porosity. The large pores can allow the grinding wheel to retain more grinding chips and coolant when grinding high-speed steel rollers. During the grinding process, a large amount of coolant filled in the large pores can not only take away the grinding chips, but also effectively reduce the temperature of the grinding area. The high porosity can improve the sharpness of the grinding wheel, and the grinding wheel can perform a large removal grinding process on the high-speed steel roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a diagram showing the effect of grinding a high-speed steel roll with the CBN grinding wheel prepared in Example 1;

[0023] Figure 2 This is the effect diagram of grinding high-speed steel rolls with commercially available resin CBN grinding wheels;

[0024] Figure 3 This is the organizational structure diagram of the surface of the CBN grinding wheel prepared in Example 1;

[0025] Figure 4 It is the organizational structure diagram of commercially available resin CBN grinding wheel;

[0026] Figure 5 It is a schematic diagram of the structure of the grinding wheel matrix;

[0027] Figure 6 Schematic diagram of the structure of the mold;

[0028] Figure 7 It is a top view of the three-petal mold. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0030] Example 1

[0031] The preparation method of the resin CBN grinding wheel for grinding high-speed steel rolls comprises the following steps:

[0032] a. Weigh 35 parts of polyimide-modified phenolic resin, 30 parts of 60#CBN abrasive, 4 parts of ferric oxide, 8 parts of silicon carbide, 5 parts of graphite, 5 parts of copper powder, 3 parts of carbon fiber, 10 parts of hollow alumina balls, put them into a three-dimensional mixer and stir and mix them for 5h. Spread the material to check that the powder is fully mixed to obtain a premix;

[0033] b. The mixture is loaded into a mold and pressed at 220°C for 3h using a hot press, with double-sided pressurization and integrated pressing to obtain a prefabricated grinding wheel;

[0034] c. The prefabricated grinding wheel after hot pressing in step b is transferred to an oven for curing, and the curing process is: 60°C curing for 1 hour, 80°C curing for 1 hour, 120°C curing for 2 hours, 150°C curing for 2 hours, 190°C curing for 2 hours, and 220°C curing for 10 hours;

[0035] d. The solidified grinding wheel blank in step c is processed by a CNC lathe to the required grinding wheel size accuracy;

[0036] e. The grinding wheel and flange in step d are assembled and matched by fastening screws, and the grinding wheel size accuracy is processed by CNC machine tools.

[0037] Example 2

[0038] The preparation method of the resin CBN grinding wheel for grinding high-speed steel rolls comprises the following steps:

[0039] a. Weigh 32 parts of polyimide-modified phenolic resin, 28 parts of 100# CBN abrasive, 2 parts of ferric oxide, 4 parts of silicon carbide, 5 parts of graphite, 5 parts of copper powder, 3 parts of carbon fiber, 2 parts of zinc oxide, 9 parts of white corundum, 10 parts of hollow alumina balls, put them into a three-dimensional mixer and stir and mix them for 5h. Spread the material to check that the powder is fully mixed to obtain a premix;

[0040] b. The mixture is loaded into a mold and pressed at 220°C for 3h using a hot press, with double-sided pressurization and integrated pressing to obtain a prefabricated grinding wheel;

[0041] c. The prefabricated grinding wheel after hot pressing in step b was transferred to an oven for curing: 60°C for 1 hour, 80°C for 1 hour, 120°C for 2 hours, 150°C for 2 hours, 190°C for 2 hours, and 220°C for 10 hours;

[0042] d. The solidified grinding wheel blank in step c is processed by a CNC lathe to the required grinding wheel size accuracy;

[0043] e. The grinding wheel and flange in step d are assembled and matched by fastening screws, and the grinding wheel size accuracy is processed by CNC machine tools.

[0044] Example 3

[0045] The preparation method of the resin CBN grinding wheel for grinding high-speed steel rolls comprises the following steps:

[0046] a. Weigh 36 parts of polyimide-modified phenolic resin, 30 parts of 180#CBN abrasive, 3 parts of chromium oxide, 4 parts of silicon carbide, 4 parts of graphite, 4 parts of copper powder, 5 parts of carbon fiber, 3 parts of zinc oxide, and 10 parts of hollow glass microspheres, put them into a three-dimensional mixer and stir and mix them for 5 hours. Spread the material to check that the powder is fully mixed to obtain a premix;

[0047] b. The mixture is loaded into a mold and pressed at 220°C for 4 hours using a hot press, with double-sided pressurization and integrated pressing to obtain a prefabricated grinding wheel;

[0048] c. The prefabricated grinding wheel after hot pressing in step b was transferred to an oven for curing at 60°C for 1 hour, 80°C for 1 hour, 120°C for 2 hours, 150°C for 2 hours, 190°C for 2 hours, and 220°C for 10 hours;

[0049] d. The solidified grinding wheel blank in step c is processed by a CNC lathe to the required grinding wheel size accuracy;

[0050] e. The grinding wheel and flange in step d are assembled and matched by fastening screws, and the grinding wheel size accuracy is processed by CNC machine tools.

[0051] Comparative Example 1

[0052] The preparation method of the resin CBN grinding wheel for grinding high-speed steel rolls comprises the following steps:

[0053] a. Weigh 33 parts of Shengquan 2895A phenolic resin, 28 parts of 100# CBN abrasive, 3 parts of ferric oxide, 4 parts of chromium oxide, 9 parts of white corundum, 7 parts of silicon carbide, 4 parts of graphite, 7 parts of copper powder, put them into a three-dimensional mixer and stir and mix them for 5h. Spread the material to check that the powder is fully mixed to obtain a premix;

[0054] b. The mixture is loaded into a mold and pressed at 190°C for 3 hours using a hot press, with double-sided pressurization and integrated pressing to obtain a prefabricated grinding wheel;

[0055] c. The prefabricated grinding wheel after hot pressing in step b is transferred to an oven for curing, and the curing process is: 60°C curing for 1 hour, 90°C curing for 1 hour, 120°C curing for 2 hours, 150°C curing for 2 hours, and 190°C curing for 10 hours;

[0056] d. The solidified grinding wheel blank in step c is processed by a CNC lathe to the required grinding wheel size accuracy.

[0057] Comparative Example 2

[0058] a. Weigh 37 parts of Shengquan 2895A phenolic resin, 20 parts of 100# CBN abrasive, 4 parts of ferric oxide, 5 parts of silicon carbide, 5 parts of graphite, 5 parts of copper powder, 7 parts of white corundum, 4 parts of carbon fiber, 13 parts of hollow alumina balls, put them into a three-dimensional mixer and stir and mix them for 5h. Spread the material to check that the powder is fully mixed to obtain a premix;

[0059] b. The mixture is loaded into a mold and pressed at 190°C for 4 hours using a hot press, with double-sided pressurization and integrated pressing to obtain a prefabricated grinding wheel;

[0060] c. The prefabricated grinding wheel after hot pressing in step b is transferred to an oven for curing, and the curing process is: 60°C curing for 1 hour, 90°C curing for 1 hour, 120°C curing for 2 hours, 150°C curing for 2 hours, and 190°C curing for 10 hours;

[0061] d. The solidified grinding wheel blank in step c is processed by a CNC lathe to the required grinding wheel size accuracy.

[0062] Comparative Example 3

[0063] The preparation method of the resin CBN grinding wheel for grinding high-speed steel rolls comprises the following steps:

[0064] a. Weigh 37 parts of polyimide resin, 20 parts of 100# CBN abrasive, 4 parts of ferric oxide, 5 parts of silicon carbide, 5 parts of graphite, 5 parts of copper powder, 7 parts of white corundum, 5 parts of carbon fiber, 12 parts of hollow alumina balls, put them into a three-dimensional mixer and stir and mix them for 5h. Spread the material to check that the powder is fully mixed to obtain a premix;

[0065] b. The mixture is loaded into a mold and pressed at 230°C for 3h using a hot press, with double-sided pressurization and integrated pressing to obtain a prefabricated grinding wheel;

[0066] c. The prefabricated grinding wheel after hot pressing in step b is transferred to an oven for curing. The curing process is: 60°C curing for 1 hour, 90°C curing for 1 hour, 120°C curing for 2 hours, 150°C curing for 2 hours, 190°C curing for 2 hours, and 230°C curing for 10 hours.

[0067] d. The solidified grinding wheel blank in step c is processed by a CNC lathe to the required grinding wheel size accuracy.

[0068] In the present embodiments 1-3 and comparative examples 1-3, the grinding wheel substrate is as follows Figure 5 As shown, the outer circle of the grinding wheel base is provided with a dovetail groove, which enhances the bonding strength between the material layer and the grinding wheel base; the pressing mold in step b is as shown Figure 6 and 7As shown, it includes a core mold 3, a grinding wheel base 1 is mounted on the outer side of the core mold 3, a material layer 2 is arranged on the outer side of the grinding wheel base 1, and the material layer 2 is filled with premixed material, an upper pressure head 4 is arranged on the upper side of the grinding wheel base 1 and the material layer 2, and a lower pressure head 5 is arranged on the lower side, and a three-petal mold 6 is mounted on the outer side of the upper pressure head 4, the material layer 2 and the lower pressure head 5, and a fastening ring 7 is mounted on the outer side of the three-petal mold 6. In step b, a double-sided pressurization process is adopted to improve the uniformity of the upper and lower density of the grinding wheel material layer, and a three-petal mold is adopted to improve the smoothness of the grinding wheel exhaust and the uniformity of the grinding wheel pore distribution, while avoiding the collapse and cracking of the material layer when the grinding wheel is unloaded.

[0069] The above embodiments, comparative examples and commercially available resin CBN grinding wheels were used to perform grinding tests on high-speed steel materials. The results are shown in the following table:

[0070]

[0071] The effect of grinding high-speed steel rolls with the CBN grinding wheel prepared in Example 1 is as follows: Figure 1 As shown in the figure, the surface quality is good, without knife marks or chatter marks; the effect of grinding high-speed steel rolls with commercially available resin CBN grinding wheels is as follows Figure 3 As shown, there are obvious vibration marks and knife marks on the surface.

[0072] The surface structure of the CBN grinding wheel prepared in Example 1 is shown in Figure 2, which has an obvious large pore structure; the structure of the commercially available resin CBN grinding wheel is shown in Figure 4.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A resin CBN grinding wheel for grinding high-speed steel rolls, characterized in that: The invention comprises the following raw materials in parts by weight: 30-40 parts of polyimide-modified phenolic resin, 20-30 parts of CBN abrasive with a particle size of 60#-180#, 20-40 parts of auxiliary materials and 5-10 parts of pore-forming agent.

2. The resin CBN grinding wheel for grinding high-speed steel rolls according to claim 1, characterized in that: The auxiliary materials are one or more of zinc oxide, chromium oxide, iron oxide, silicon carbide, white corundum, graphite, copper powder and carbon fiber.

3. The resin CBN grinding wheel for grinding high-speed steel rolls according to claim 2, characterized in that: The auxiliary materials include 4 parts of ferric oxide, 8 parts of silicon carbide, 5 parts of graphite, 5 parts of copper powder and 3 parts of carbon fiber.

4. The resin CBN grinding wheel for grinding high-speed steel rolls according to claim 2, characterized in that: The auxiliary materials include 2 parts of ferric oxide, 4 parts of silicon carbide, 5 parts of graphite, 5 parts of copper powder, 3 parts of carbon fiber, 2 parts of zinc oxide and 9 parts of white corundum.

5. The resin CBN grinding wheel for grinding high-speed steel rolls according to claim 2, characterized in that: The auxiliary materials include 3 parts of chromium oxide, 4 parts of silicon carbide, 4 parts of graphite, 4 parts of copper powder, 5 parts of carbon fiber, and 3 parts of zinc oxide.

6. The resin CBN grinding wheel for grinding high-speed steel rolls according to claim 1, characterized in that: The pore-forming agent is one or both of hollow alumina spheres and glass microspheres.

7. The method for preparing the resin CBN grinding wheel for grinding high-speed steel rolls according to any one of claims 1 to 6, characterized in that: The steps include: a. Put the polyimide-modified phenolic resin, abrasive and auxiliary materials into a three-dimensional mixer and stir and mix them to obtain a mixture; b. Put the mixed material into a mold, and use a hot press to press it on both sides and form it into an integrated form to obtain a prefabricated grinding wheel; c. The prefabricated grinding wheel in step b is cured, and the curing process is: 40-60°C for 1 hour, 70-90°C for 1 hour, 100-120°C for 2 hours, 130-150°C for 2 hours, 160-190°C for 2 hours, and 190-220°C for 10 hours; d. Processing the grinding wheel blank cured in step c to a desired grinding wheel size accuracy to obtain a resin CBN grinding wheel for grinding high-speed steel rolls.

8. The preparation method according to claim 7, characterized in that: In step d, the solidified grinding wheel blank is first processed by a CNC lathe to the required grinding wheel size accuracy; then the processed grinding wheel is assembled and matched with the flange by fastening screws, and the grinding wheel size accuracy is processed by a CNC machine tool.

9. The preparation method according to claim 7, characterized in that: In step b, a hot press is used to press and form the product at 220° C. for 3-5 hours.

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