Superhard grinding wheel with good grinding effect and preparation method

Abstract

The invention provides a superhard grinding wheel with a good grinding effect. The superhard grinding wheel comprises a base, a plurality of CBN grinding discs and a plurality of grooves. The base comprises a first base body and a second base body, and the second base body is detachably installed on the first base body. The multiple CBN sand pieces are all installed on the second base body and define an annular structure. The multiple grooves are formed in the sides, back on to the second base body, of the multiple CBN sand pieces correspondingly. The invention further provides a preparation method of the superhard grinding wheel with the good grinding effect, and the preparation method comprises the following steps that the grinding material and the resin binding agent are prepared, the grinding material and the resin binding agent are mixed to obtain mixed powder, the mixed powder is put into a mold for cold pressing, after drying treatment, the mixed powder is put into a high-temperature sintering furnace to be sintered, and the CBN grinding disc is obtained. Grooves are formed in the surfaces of the CBN sand discs through a diamond tool, the multiple CBN sand discs are installed on the base, and the multiple CBN sand discs are trimmed through laser smelting. According to the superhard grinding wheel with the good grinding effect and the preparation method, the grinding effect is good.

Description

Technical Field

[0001] The present application relates to the field of grinding technology, and in particular to a superhard grinding wheel with good grinding effect and a preparation method thereof. Background Art

[0002] Cubic boron nitride (CBN) is often referred to as a superhard material. It has extremely high hardness, wear resistance, and thermal conductivity, and is widely used in superhard grinding wheels. During the grinding process, superhard grinding wheels have slow wear, high grinding ratio, low grinding force, low heat generation, and good processing accuracy, which is conducive to the realization of automation, informatization, leanness, and intelligence. Due to the excellent grinding performance of superhard grinding wheels, they are now widely used in the processing of difficult-to-grind materials and hard and brittle materials in industries such as aerospace, national defense, precision resins, medical equipment, rail transportation, oil exploration, architectural decoration, mechanical equipment, tools and molds, new energy, microelectronics, and optoelectronics. However, in related technologies, superhard grinding wheels are affected by their own structure and processing technology, which easily leads to poor grinding effects of superhard grinding wheels. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a superhard grinding wheel with good grinding effect and a preparation method thereof, so as to solve the technical problem in the prior art that the superhard grinding wheel is easily affected by its own structure and processing technology, resulting in poor grinding effect of the superhard grinding wheel.

[0004] To achieve the above purpose, the technical solution adopted in this application is: to provide a superhard grinding wheel with good grinding effect, including: A base, the base comprising a first base and a second base, wherein the second base is detachably mounted on the first base; A plurality of CBN sand sheets, wherein the plurality of CBN sand sheets are installed on the second substrate and enclosed to form a ring structure; A plurality of grooves are respectively arranged on a side of the plurality of CBN sand sheets facing away from the second substrate.

[0005] Optionally, the porosity of the CBN sand piece is greater than 44%.

[0006] The present application also provides a method for preparing a superhard grinding wheel with good grinding effect, comprising the following steps: Preparation of abrasives and resin bonds; The abrasive and the resin binder are mixed to obtain a mixed powder; The mixed powder is placed in a mold for cold pressing, and after drying, is placed in a high-temperature sintering furnace for sintering to obtain the CBN sand sheet; Grooving the surface of the CBN sand sheet by a diamond tool; Installing a plurality of CBN sand sheets on the base; The plurality of CBN sand discs are trimmed by laser melting.

[0007] Optionally, the abrasive includes CBN bare material and nickel-containing plated material.

[0008] Optionally, the mass ratio of the CBN bare material to the nickel-containing plated material is 1:(1-3).

[0009] Optionally, the step of preparing the resin binder includes: uniformly mixing methyltrimethoxysilane, phenol, epoxy resin, benzenesulfonic acid and glycine, stirring while heating, and adding an appropriate amount of polyformaldehyde after condensation and reflux until the generated product becomes gel-like.

[0010] Optionally, a pore-forming agent is also added to the mixed powder.

[0011] Optionally, the pore-forming agent is a corundum hollow body, a glass hollow body or a plastic hollow body.

[0012] Optionally, the added amount of the pore-forming agent is 5%-30% of the total mass of the mixed powder.

[0013] The beneficial effects of the superhard grinding wheel with good grinding effect provided by the present application are: The super-hard grinding wheel with good grinding effect provided by the present application effectively reduces the processing difficulty and effectively reduces the production cost compared with the related art. By using the CBN sand sheet, the hardness and wear resistance of the CBN sand sheet are greatly improved compared with the related art, and the grinding effect is good. By providing a groove on the surface of the CBN sand sheet, it is helpful to increase the surface area of ​​the CBN sand sheet, which is convenient for the heat dissipation of the CBN sand sheet, thereby preventing the CBN sand sheet from overheating and affecting the grinding effect of the CBN sand sheet, and also helping to extend the service life of the CBN sand sheet.

[0014] The method for preparing a superhard grinding wheel with good grinding effect provided in the present application has the following beneficial effects: The preparation method of the superhard grinding wheel with good grinding effect provided by the present application has a simple production process and relatively low cost, which is conducive to promotion to industrial applications. Compared with the related art of trimming the CBN sand discs before assembly, the present application trims the multiple CBN sand discs by laser melting after the multiple CBN sand discs and the base are assembled, which can eliminate the height difference between the CBN sand discs and help improve the grinding effect of the grinding wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 A three-dimensional diagram of a superhard grinding wheel with good grinding effect provided in an embodiment of the present application; Figure 2 A flow chart of a method for preparing a superhard grinding wheel with good grinding effect provided in an embodiment of the present application; Figure 3 The CBN sand sheet morphology and 3D simulation diagram of the method for preparing a superhard grinding wheel with good grinding effect provided in the embodiment of the present application (the mass ratio of CBN bare material to nickel-containing plated material is 1:0); Figure 4 The CBN sand sheet morphology and 3D simulation diagram of the method for preparing a superhard grinding wheel with good grinding effect provided in the embodiment of the present application (the mass ratio of CBN bare material to nickel-containing plated material is 1:1); Figure 5 The CBN sand sheet morphology and 3D simulation diagram of the method for preparing a superhard grinding wheel with good grinding effect provided in the embodiment of the present application (the mass ratio of CBN bare material to nickel-containing plated material is 1:2); Figure 6 The CBN sand sheet morphology and 3D simulation diagram of the method for preparing a superhard grinding wheel with good grinding effect provided in the embodiment of the present application (the mass ratio of CBN bare material to nickel-containing plated material is 1:3); Figure 7 A bar chart showing the addition of different pore-forming agents in the method for preparing a superhard grinding wheel with good grinding effect provided in an embodiment of the present application; Figure 8 A line graph showing the addition of different amounts of pore-forming agents in the method for preparing a superhard grinding wheel with good grinding effect provided in an embodiment of the present application.

[0017] Among them, the reference numerals in the figure are: 10. base; 11. first base; 12. second base; 20. CBN sandpaper; 30. Groove. DETAILED DESCRIPTION

[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0019] It should be noted that when a component is referred to as being "mounted on", "fixed on" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0020] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0022] In this application, the term "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0023] like Figure 1 As shown, the embodiment of the present application provides a superhard grinding wheel with good grinding effect, including a base 10, a plurality of CBN sand discs 20 and a plurality of grooves 30. The base 10 includes a first substrate 11 and a second substrate 12, and the second substrate 12 is detachably mounted on the first substrate 11. The plurality of CBN sand discs 20 are all mounted on the second substrate 12 and enclosed to form an annular structure. The plurality of grooves 30 are respectively opened on the side of the plurality of CBN sand discs 20 facing away from the second substrate 12.

[0024] Specifically, in the actual production process, the sanding ring is mostly processed by an integrated molding method. However, during the processing, the sanding ring inevitably has a processing error, which causes the sanding ring to fail to meet the processing standards. In this case, the entire sanding ring needs to be scrapped, resulting in an increase in production costs.

[0025] The superhard grinding wheel provided by the present application is formed into an annular structure by enclosing multiple CBN sand sheets 20, which avoids the situation that the entire sanding ring is scrapped due to the local quality of the sanding ring not meeting the standard. Compared with the related art, the processing difficulty is effectively reduced, and the production cost is effectively reduced. Through the CBN sand sheet 20, the hardness and wear resistance of the CBN sand sheet 20 are greatly improved compared with the related art, and the grinding effect is good. By opening a groove 30 on the surface of the CBN sand sheet 20, it is helpful to increase the surface roughness of the CBN sand sheet 20, thereby helping to improve the grinding effect of the CBN sand sheet 20 on the workpiece. In addition, through the groove 30, it is helpful to increase the surface area of ​​the CBN sand sheet 20, which is convenient for the heat dissipation of the CBN sand sheet 20, thereby preventing the CBN sand sheet 20 from overheating and affecting the grinding effect of the CBN sand sheet 20, and also helping to extend the service life of the CBN sand sheet 20. The base 10 facilitates the installation of the device to an external rotary device, thereby driving the plurality of CBN sand discs 20 to rotate, so that the plurality of CBN sand discs 20 can grind the workpiece. The bonding layer facilitates the installation of the plurality of CBN sand discs 20 to the base 10, which helps to improve the structural stability between the CBN sand discs 20 and the base 10 and prevents them from loosening.

[0026] In one embodiment of the present application, see Figure 1 , the porosity of the CBN sand piece 20 is greater than 44%.

[0027] Specifically, the CBN sand piece 20 is usually composed of abrasive, resin binder, filler and pores. Among them, the pores are an important component of the CBN sand piece 20, which plays the role of chip storage, heat dissipation, cooling, etc. during the grinding process of the CBN sand piece 20, and directly affects the grinding performance and service life of the CBN sand piece 20.

[0028] With such configuration, the porosity of the CBN sand piece 20 is greater than 44%, which is higher than that of the related art. During the grinding process, the CBN sand piece 20 can dissipate heat quickly, thereby preventing the grinding performance of the CBN sand piece 20 from being affected.

[0029] like Figures 1 to 8 As shown, the present application also provides a method for preparing a superhard grinding wheel with good grinding effect, comprising the following steps: S10: preparing abrasive and resin bond.

[0030] S20: mixing the abrasive and the resin binder to obtain a mixed powder.

[0031] S30: putting the mixed powder into a mold for cold pressing, and after drying, putting it into a high-temperature sintering furnace for sintering to obtain a CBN sand sheet 20.

[0032] S40: Grooving the surface of the CBN sand disc 20 by using a diamond tool.

[0033] S50 : installing a plurality of CBN grinding discs 20 on the base 10 .

[0034] S60: trimming the plurality of CBN sand discs 20 by laser melting.

[0035] Specifically, since the superhard grinding wheel of the present application is composed of multiple CBN sand discs 20, during the assembly process, a height difference is easily formed between two adjacent CBN sand discs 20. Therefore, during the grinding process, the height difference will cause the grinding effect of the grinding wheel on the workpiece to deteriorate.

[0036] The method for preparing a superhard grinding wheel with good grinding effect provided in the embodiment of the present application has a simple production process and relatively low cost, which is conducive to promotion to industrial applications. Compared with the related art of trimming the CBN sand disc 20 before assembly, the present application trims the multiple CBN sand discs 20 by laser melting after the multiple CBN sand discs 20 and the base 10 are assembled, which can eliminate the height difference between the CBN sand discs 20 and help improve the grinding effect of the grinding wheel.

[0037] In some possible implementations, the abrasive includes a CBN bare material and a nickel-containing plated material. It should be noted here that the nickel-containing plated material refers to a nickel-containing plated material obtained by plating nickel on the surface of the CBN bare material. The plating can reduce the thermal shock of the abrasive on the resin binder, improve the bonding strength between the abrasive and the resin binder, improve the crushing strength of the abrasive particles, and isolate and protect the abrasive particles. In summary, compared with the related art in which only CBN bare material is used as the abrasive, the addition of nickel-containing plated material helps to improve the grinding effect of the grinding wheel.

[0038] In some possible implementations, the mass ratio of the CBN bare material to the nickel-containing plated material is 1:(1-3). The CBN sand sheet 20 is trimmed by laser cladding. Figure 3 The surface morphology and 3D simulation diagram of CBN sand sheet 20 after trimming when the mass ratio of CBN bare material and nickel-containing plated material is 1:0. Figure 4 The surface morphology and 3D simulation diagram of CBN sand sheet 20 after trimming when the mass ratio of CBN bare material and nickel-containing plated material is 1:1. Figure 5 The surface morphology and 3D simulation diagram of CBN sand sheet 20 after trimming when the mass ratio of CBN bare material and nickel-containing plated material is 1:2. Figure 5 The surface morphology and 3D simulation diagram of CBN sand sheet 20 after trimming when the mass ratio of CBN bare material and nickel-containing plated material is 1:3. Figures 3 to 6 In the chart, red represents high points and blue represents low points. Figure 3 and Figure 4 , Figure 5 , Figure 6 Comparison of the three figures shows that due to Figure 3All the CBN bare materials are used. After trimming, the abrasive on the surface of CBN sand sheet 20 is obviously falling off, and a large area of ​​low points appears. Figures 4 to 6 CBN bare material and nickel-containing plated material are used, and the abrasive on the surface of the CBN sand sheet 20 is less shed after trimming. Therefore, under this ratio, when the CBN sand sheet 20 is trimmed, compared with the related art that only uses CBN bare material, by adding nickel-containing plated material, the bonding force between the abrasive and the resin binder can be increased, the abrasive can be effectively prevented from falling off, and the grinding effect is better. The mass ratio of CBN bare material and nickel-containing plated material can be any value such as 1:1, 1:1.5, 1:2, 1:2.5, 1:3, or an interval value between any two values.

[0039] In some possible implementations, the step of preparing the resin binder includes: uniformly mixing methyltrimethoxysilane, phenol, epoxy resin, benzenesulfonic acid and glycine, stirring while heating, and adding an appropriate amount of polyoxymethylene after condensation and reflux until the generated product becomes a gel. In the embodiment of the present application, the phenolic resin is modified by using an organosilicon modifier, which helps to improve the heat resistance and mechanical properties of the resin binder, thereby helping to improve the grinding effect of the grinding wheel.

[0040] In some possible implementations, a pore forming agent is also added to the mixed powder. In this case, the pore forming agent is added to the mixed powder, and when the CBN sand piece 20 is formed, the pore forming rate of the CBN sand piece 20 can be increased. Compared with the related art, the heat dissipation performance is better, and the self-sharpening property of the CBN sand piece 20 can be improved, and the grinding effect is good.

[0041] In some possible implementations, the pore-forming agent is a corundum hollow body, a glass hollow body or a plastic hollow body. Figure 7It can be seen that after adding three different pore-forming agents to the CBN sand sheet 20, the pore forming rate is increased compared with the CBN sand sheet 20 without pore-forming agent. On the one hand, the pore forming rate of the CBN sand sheet 20 with glass hollow body added is the highest, and the pore forming rate of the CBN sand sheet 20 with corundum hollow body added is the lowest. On the other hand, after adding three different pore-forming agents to the CBN sand sheet 20, the flexural strength of the CBN sand sheet 20 with corundum hollow body added is improved, and the flexural strength of the CBN sand sheet 20 with glass hollow body and plastic hollow body added is reduced. Since the wall thickness of the corundum hollow body is large and there are some solid bodies, it can play a good supporting role in the CBN sand sheet 20. The wall thickness of the glass hollow body is small, and a small part of it will be broken due to external force during the mixing and molding process. The plastic hollow body is an organic pore-forming agent, which does not exist after the CBN sand sheet 20 is sintered and formed, so its flexural strength is low. In summary, the CBN sand sheet 20 test strip with added glass hollow body has the highest porosity and the best pore-forming effect. The flexural strength of the CBN sand sheet 20 decreases slightly, taking into account both strength and sharpness requirements. Therefore, glass hollow body is preferably used as pore-forming agent.

[0042] It is explained here that the pore forming rate of the CBN sand piece 20 is tested by the Archimedes drainage method. The pore forming rate formula of the CBN sand piece 20 is as follows: in, is the volume density of the CBN sand piece 20, which can be obtained according to the size and mass of the CBN sand piece 20; is the true density of the CBN sand piece 20, which can be obtained according to the pycnometer test method; is the pore forming rate of the CBN sand piece 20.

[0043] In some possible implementations, the amount of pore-forming agent added is 5%-30% of the total mass of the mixed powder. The amount of pore-forming agent added can be any value such as 5%, 10%, 15%, 20%, 25%, 30%, or an interval value between any two values. Figure 8, with the increase of the amount of pore former added, the pore formation first increases and then stabilizes. When the amount of pore former added is less than 20%, the flexural strength of CBN sand sheet 20 decreases slightly. When the amount of pore former added exceeds 20%, the flexural strength decreases significantly. The addition of pore former increases the porosity of CBN sand sheet 20. Since the pore former and abrasive can be well combined, when the amount of pore former added is less than 20%, the flexural strength of CBN sand sheet 20 does not decrease significantly. With the increase of the amount of pore former added, the porosity continues to increase. When the amount of pore former added is greater than 20%, the pore former does not fuse better with the CBN sand sheet 20, resulting in a significant decrease in the flexural strength of CBN sand sheet 20. Therefore, when the volume fraction of the pore former is 20%, the superhard grinding wheel has a better grinding effect.

[0044] One or more embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of the present application should be included in the protection scope of the present application.

Claims

1. A superhard grinding wheel with good grinding effect, characterized in that: include: A base (10), the base (10) comprising a first base (11) and a second base (12), the second base (12) being detachably mounted on the first base (11); A plurality of CBN sand sheets (20), wherein the plurality of CBN sand sheets (20) are all mounted on the second base body (12) and are enclosed to form a ring-shaped structure; A plurality of grooves (30), wherein the plurality of grooves (30) are respectively opened on a side of the plurality of CBN sand sheets (20) facing away from the second base body (12).

2. The superhard grinding wheel with good grinding effect as claimed in claim 1, characterized in that: The porosity of the CBN sand sheet (20) is greater than 44%.

3. A method for preparing a superhard grinding wheel with good grinding effect as claimed in claim 1, characterized in that: The following steps are involved: Preparation of abrasives and resin bonds; The abrasive and the resin binder are mixed to obtain a mixed powder; The mixed powder is placed in a mold for cold pressing, and after drying, is placed in a high-temperature sintering furnace for sintering to obtain the CBN sand sheet (20); Grooving the surface of the CBN sand sheet (20) using a diamond tool; Installing a plurality of CBN sand sheets (20) on the base (10); The plurality of CBN sand sheets (20) are trimmed by laser melting.

4. The method for preparing a superhard grinding wheel with good grinding effect as claimed in claim 3, characterized in that: The abrasives include CBN bare material and nickel-containing plated material.

5. The method for preparing a superhard grinding wheel with good grinding effect as claimed in claim 4, characterized in that: The mass ratio of the CBN bare material to the nickel-containing plated material is 1:(1-3).

6. The method for preparing a superhard grinding wheel with good grinding effect as claimed in claim 3, characterized in that: The steps of preparing the resin binder include: uniformly mixing methyltrimethoxysilane, phenol, epoxy resin, benzenesulfonic acid and glycine, stirring while heating, and adding a proper amount of polyformaldehyde after condensation and reflux until the generated product becomes gel.

7. The method for preparing a superhard grinding wheel with good grinding effect as claimed in claim 3, characterized in that: A pore-forming agent is also added to the mixed powder.

8. The method for preparing a superhard grinding wheel with good grinding effect as claimed in claim 7, characterized in that: The pore-forming agent is a corundum hollow body, a glass hollow body or a plastic hollow body.

9. The method for preparing a superhard grinding wheel with good grinding effect as claimed in claim 7, characterized in that: The added amount of the pore-forming agent is 5%-30% of the total mass of the mixed powder.

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