Special-shaped ceramic bond CBN grinding wheel for machining crankshaft flange face and preparation method

Abstract

The special-shaped ceramic bond grinding wheel comprises a steel base body and a ceramic bond working layer bonded to the steel base body, and the ceramic bond working layer is formed by integrally pressing CBN grinding materials, ceramic bonds, white corundum, pore forming agents and phenolic resin liquid at a time through a cold pressing technology and then is subjected to heat treatment and heat treatment to obtain the special-shaped ceramic bond grinding wheel for machining the crankshaft flange face. Sintering at high temperature to obtain special-shaped blocks, and splicing the special-shaped blocks, wherein the radian of the adhesive part of each special-shaped block is attached to a base body. According to the invention, a new formula is adopted for cold press molding, so that the problem of non-uniform hardness of different areas is solved, and one-time integral press molding of special-shaped cakes is realized. When the ceramic bond grinding wheel for machining the crankshaft flange face is prepared, the grinding allowance is small, the workload can be reduced, the delivery cycle is shortened, and the grinding material cost is saved.

Description

Technical Field

[0001] The invention belongs to the technical field of grinding wheels for grinding processing, and specifically relates to a CBN grinding wheel with a ceramic bond for processing a special-shaped crankshaft flange surface and a preparation method thereof. Background Art

[0002] Vitrified bond CBN grinding wheels are generally composed of three parts: working layer, substrate, and adhesive layer. The working layer is also called the grinding layer, which is composed of cubic boron nitride abrasive, vitrified bond, and filler. The substrate is generally a steel substrate, aluminum substrate, titanium alloy, carbon fiber, or ceramic substrate. The adhesive layer does not participate in grinding, but mainly fixes the working layer on the substrate. Vitrified bond CBN grinding wheels have the advantages of good grinding performance, high grinding efficiency, and long dressing cycle. They are suitable for processing ferrous metal materials such as high-speed steel, bearing steel, tool steel, and chilled cast iron.

[0003] The crankshaft is the most important part of the engine. It bears the force from the connecting rod and converts it into torque to output through the crankshaft and drive other accessories on the engine. The crankshaft flange surface requires good roughness and high dimensional accuracy. At the same time, there are many grinding parts and they are not on the same plane. The existing grinding wheels are basically prepared into regular shape blocks, and then ground to the target size with a large margin, which increases the difficulty of grinding operations, prolongs the delivery cycle, wastes CBN abrasives and other raw materials, and is more difficult to prepare for the grinding surface of workpieces with large drop. Summary of the invention

[0004] The purpose of the present invention is to provide a ceramic bond CBN grinding wheel for machining a crankshaft flange surface with a special shape, so as to solve the problems of difficult grinding operation, long delivery cycle, and waste of abrasives and other raw materials in preparing and machining the ceramic bond CBN grinding wheel for machining the crankshaft flange surface with a special shape.

[0005] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: A special-shaped ceramic bond CBN grinding wheel for machining crankshaft flange surface, comprising a substrate and a ceramic bond CBN working layer bonded to the substrate; the ceramic bond CBN working layer is formed by splicing special-shaped ceramic bond CBN agglomerates; the special-shaped ceramic bond CBN agglomerates are formed by cold pressing CBN abrasives, ceramic bond, white corundum, pore-forming agent, and phenolic resin liquid, and then sintered at high temperature. Preferably, the ceramic bond is prepared from silicon dioxide, aluminum oxide, boric acid, potassium carbonate, calcium carbonate, and zinc oxide.

[0006] In the present invention, the pore-forming agent is carbon powder, and the particle size thereof is 100 to 300 μm.

[0007] In the present invention, the mass ratio of CBN abrasive, vitrified binder, white corundum, pore-forming agent and phenolic resin liquid is (40-60): (15-25): (12-25): (4-11): (2-9). Preferably, the mass ratio of CBN abrasive, vitrified binder, white corundum, pore-forming agent and phenolic resin liquid is (45-55): (16-23): (15-20): (5-10): (4-8); further preferably, the mass ratio of CBN abrasive, vitrified binder, white corundum, pore-forming agent and phenolic resin liquid is (46-50): (17-20): (16-20): (6-9): (7-8).

[0008] In the present invention, the mass ratio of silicon dioxide, aluminum oxide, boric acid, potassium carbonate, calcium carbonate and zinc oxide is (38-47): (22-32): (13-22): (5-10): (2-5); preferably, the mass ratio of silicon dioxide, aluminum oxide, boric acid, potassium carbonate, calcium carbonate and zinc oxide is (40-45): (25-30): (15-20): (8-10): (3-5).

[0009] The present invention discloses a method for preparing the above-mentioned special-shaped ceramic bond CBN grinding wheel for machining crankshaft flange surface, comprising the following steps: (1) Mixing CBN abrasive, ceramic binder, white corundum, pore-forming agent, and phenolic resin liquid to obtain a working layer mixture; (2) adding the working layer mixture into the mold cavity and pressing the whole body into shape by cold pressing process at one time to obtain a ceramic binder CBN special-shaped agglomerated green body; (3) sintering the ceramic binder CBN special-shaped agglomerate green body to obtain the ceramic binder CBN special-shaped agglomerate; (4) The ceramic bond CBN special-shaped agglomerates are bonded to the substrate to form a ceramic bond CBN working layer, thereby obtaining a ceramic bond CBN grinding wheel for machining the special-shaped crankshaft flange surface.

[0010] In the above scheme, in step (1), CBN abrasive, ceramic binder, white corundum and pore-forming agent are placed in a three-dimensional mixer for a mixing time of 100 to 150 minutes, and then the resin liquid is added and stirred evenly.

[0011] In the above scheme, in step (1), the ceramic binder is prepared by smelting, rapidly cooling and pulverizing silicon dioxide, aluminum oxide, boric acid, potassium carbonate, calcium carbonate and zinc oxide; specifically, silicon dioxide, aluminum oxide, boric acid, potassium carbonate, calcium carbonate and zinc oxide are uniformly mixed and then smelted in a smelting furnace at 1500° C. to 1600° C. The molten material falls into water and is rapidly cooled and then wet-milled in a ball mill. The powder is dried at 150° C. to 200° C. and then sieved. The powder that can pass through a 600-mesh standard sieve but cannot pass through an 800-mesh standard sieve is taken to obtain the ceramic binder.

[0012] In the above scheme, in step (2), according to the shape of the crankshaft flange surface, the working layer mixture is put into the mold cavity, the mold is placed in a press as a whole, the pressure is set to 10 to 30 tons, and the pressure holding time is 60 to 90 seconds; after demolding, a ceramic binder CBN special-shaped agglomerate blank is obtained. The crankshaft flange surface requires good roughness and high dimensional accuracy, and at the same time, there are many grinding parts, which are not in the same plane. Existing grinding wheels are basically prepared into conventional shape agglomerates, and then large excess grinding is performed to the target size, which increases the difficulty of grinding operations, prolongs the delivery cycle, wastes CBN abrasives and other raw materials, and is more difficult to prepare for the grinding surface of workpieces with large drop. The present invention adopts a new technical idea and prepares a new formula with existing raw materials. It can realize the one-time integral pressing and molding of a ceramic binder CBN special-shaped agglomerate matching the shape of the crankshaft flange surface through a cold pressing process, and then conventionally sintering to obtain a ceramic binder CBN special-shaped agglomerate. This overcomes the technical bias of the prior art that first prepares agglomerates of conventional shapes and then performs large-amount grinding to the target shape, and also solves the problem of complex preparation methods of the prior art that the end face grinding layer and the outer cylindrical grinding layer are prepared in steps.

[0013] In the above scheme, in step (3), sintering is carried out in air, and the process is to heat from room temperature to 450-550°C over 3-5 hours, keep warm for 2.5-3.5 hours, then heat to 700-900°C over 1-3 hours, keep warm for 0.5-1.5 hours, then heat to 900-1000°C over 3.5-5 hours, keep warm for 1.5-2.5 hours, and then cool down with the furnace.

[0014] In the present invention, the substrate is an existing component, and the present invention selects a steel substrate; the specific method of splicing the ceramic binder CBN special-shaped agglomerates into the ceramic binder CBN working layer is a conventional technology, generally using gluing, and the curvature of the special-shaped agglomerates at the gluing point fits with the substrate; as common sense, it is then mechanically processed to obtain a grinding wheel for processing the crankshaft flange surface.

[0015] The present invention discloses the application of the above-mentioned ceramic bond CBN grinding wheel for machining a crankshaft flange surface in preparing a crankshaft flange surface machining abrasive tool, or the application of the above-mentioned ceramic bond CBN grinding wheel for machining a crankshaft flange surface in machining a crankshaft flange surface. Preferably, the machining is grinding.

[0016] The invention discloses a method for machining a crankshaft flange surface, and the crankshaft flange surface is machined by utilizing the above-mentioned special-shaped ceramic bond CBN grinding wheel for machining the crankshaft flange surface.

[0017] Compared with the prior art, the technical solution of the present invention has the following advantages: 1. The present invention adopts a new technical idea and prepares a new formula with existing raw materials. It can realize the one-time integral pressing and molding of a ceramic binder CBN special-shaped agglomerate matching the shape of the crankshaft flange surface by a cold pressing process, and then conventionally sintered to obtain a ceramic binder CBN special-shaped agglomerate; it solves the problems of difficult operation, long delivery cycle, and waste of abrasives and other raw materials in the prior art of preparing and processing special-shaped ceramic binder CBN grinding wheels for crankshaft flange surfaces.

[0018] 2. The ceramic bond CBN grinding wheel agglomerate for machining the crankshaft flange surface prepared by the present invention is an integral structure, which avoids the influence of the splicing structure on the workpiece precision and roughness during grinding.

[0019] 3. The present invention controls the pressing process by modules and components, so that the density of the prepared agglomerates is uniform and the quality of the processed workpieces is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the structure of a vitrified bond grinding wheel.

[0021] Figure 2 It is a schematic diagram of the mold assembly structure of the present invention.

[0022] Figure 3 Schematic diagram of the mold module.

[0023] Figure 4 Schematic diagram of ceramic binder CBN agglomeration.

[0024] Figure 5 This is a physical picture of the processing equipment. DETAILED DESCRIPTION

[0025] The crankshaft flange surface requires good roughness and high dimensional accuracy, and there are many grinding parts that are not on the same plane. Existing grinding wheels are basically prepared into regular shape blocks, and then grind into CBN special-shaped blocks with large excess, which increases the difficulty of grinding operations, prolongs the delivery cycle, wastes CBN abrasives and other raw materials, and is more difficult to prepare for the grinding surface of workpieces with large drop.

[0026] In order to reduce waste, the existing technology adopts step-by-step preparation of the end face grinding layer and the outer cylindrical grinding layer, and then stacks and assembles them into CBN special-shaped agglomerates, which obviously increases the complexity of preparation. In particular, the splicing structure has an adverse effect on the accuracy and roughness of the workpiece during grinding. Therefore, it is rarely used in industrial production.

[0027] For CBN special-shaped agglomerates, their unconventional size, forming effect and sintering effect are one of the key factors in the grinding process. The choice of formula has a great influence on agglomerate forming and sintering. The prior art believes that conventional formulas are not suitable for one-time integral pressing and forming by cold pressing process, and the performance of sintered abrasive blocks is poor. This is the reason why most of the prior art adopts the method of preparing agglomerates of conventional shapes (generally square) and then grinding them into CBN special-shaped agglomerates with large excess.

[0028] The present invention adopts a new technical idea and prepares a new formula with existing raw materials. It can realize the one-time integral pressing and molding of a ceramic binder CBN special-shaped agglomerate matching the shape of the crankshaft flange surface through a cold pressing process, and then conventionally sintering to obtain a ceramic binder CBN special-shaped agglomerate. This overcomes the technical bias of the prior art of first preparing agglomerates of conventional shapes and then performing large-amount grinding to the target shape, and also solves the problem of the prior art of using a step-by-step preparation of end face grinding layers and outer cylindrical grinding layers.

[0029] The present invention discloses a special-shaped ceramic bond CBN grinding wheel for machining a crankshaft flange surface and a preparation method thereof, which may specifically include the following steps: (1) After silicon dioxide, aluminum oxide, boric acid, potassium carbonate, calcium carbonate and zinc oxide are mixed evenly, they are melted in a melting furnace at 1500°C to 1600°C. The molten material falls into water and is rapidly cooled and then wet-milled in a ball mill. The powder is dried at 150°C to 200°C and then sieved. The powder that can pass through a 600-mesh standard sieve but cannot pass through an 800-mesh standard sieve is taken to obtain a ceramic binder. The CBN abrasive, ceramic binder, white corundum and pore-forming agent are placed in a three-dimensional mixer for a mixing time of 110 to 130 minutes, and then the resin liquid is added and stirred evenly. (2) According to the shape of the crankshaft flange surface, the working layer mixture is put into the mold cavity, and the entire mold is placed in a press for pressing, the pressure is set to 20 to 30 tons, and the pressure holding time is 70 to 90 seconds; after demolding, a ceramic binder CBN special-shaped agglomerate body is obtained; According to the shape of the crankshaft flange surface, the present invention puts the working layer mixture into the mold cavity, puts the entire mold into a press to obtain a ceramic binder CBN special-shaped agglomerate. The specific feeding operation is to first assemble the front section outer cylindrical surface and end face module, the front section outer cylindrical surface module, the rear section outer cylindrical surface and end face module, and the rear section outer cylindrical surface module in sequence, feed the first component outer cylindrical surface of the special-shaped agglomerate, scrape out the curvature, and put in the upper support body of the first component outer cylindrical surface of the special-shaped agglomerate; then feed the second component outer cylindrical surface and end face of the special-shaped agglomerate, scrape out the curvature, and put in the second component outer cylindrical surface and end face upper support body of the special-shaped agglomerate; place a parallel auxiliary pressure module on the first component outer cylindrical surface upper support body and the second component outer cylindrical surface and end face upper support body. , knock the parallel auxiliary pressure module to make the upper support body of the outer cylindrical surface of the first component and the upper support body of the outer cylindrical surface and end surface of the second component in the same plane; turn over the mold, place the parallel auxiliary pressure module, knock the parallel auxiliary pressure module to make the front end outer cylindrical module, the front end face module, the rear end outer cylindrical module, and the rear end face module parallel; put the mold as a whole into the press to press, set the pressure and holding time, and obtain the ceramic binder CBN special-shaped agglomerate after demolding; the second component outer cylindrical surface and end surface of the special-shaped agglomerate can also be fed first, and then the first component outer cylindrical surface of the special-shaped agglomerate can be fed; (3) The green body is placed in an electric furnace and sintered in air; the sintering process is to heat the green body from room temperature to 450-500°C over 3.5-4.5 hours, keep the temperature for 2.5-3.5 hours, then heat the green body to 750-850°C over 1.5-2.5 hours, keep the temperature for 0.5-1.5 hours, then heat the green body to 900-950°C over 3.5-5 hours, keep the temperature for 1.5-2.5 hours, then cool the green body with the furnace to obtain a ceramic binder CBN shaped agglomerate, the curvature of the shaped agglomerate at the gluing point is in contact with the substrate; (4) The ceramic binder CBN special-shaped agglomerates are bonded to the steel substrate to form a working layer, and then mechanically processed to obtain a crankshaft flange surface grinding wheel, which has a circular structure as a whole, with the working layer on the outer ring and the substrate as the inner ring.

[0030] In the above scheme, in step (3), the sintering process is to heat from room temperature to 500°C over 4 hours, keep it at that temperature for 3 hours, then heat to 800°C over 2 hours, keep it at that temperature for 1 hour, then heat to 950°C over 4 hours, keep it at that temperature for 2 hours, and then cool down with the furnace.

[0031] In the above scheme, in step (4), the machining is conventional machining, such as substrate turning, CBN working layer grinding, etc.

[0032] The present invention is further described below in conjunction with the accompanying drawings and embodiments; the specific raw materials are all existing products that meet the conventional requirements in the field of grinding wheels, wherein CBN abrasives are 100-200 microns, white corundum is 100-200 microns, silicon dioxide is 10-20 microns, aluminum oxide is 10-20 microns, boric acid, potassium carbonate, and calcium carbonate are granular, zinc oxide is 10 microns on average, and the pore-forming agent is carbon powder with a particle size of 150 to 200 μm; the specific preparation operations and performance tests are conventional techniques, and the specific feeding operations are conventional techniques. Embodiment 1

[0033] like Figure 1 As shown, a special-shaped ceramic bond CBN grinding wheel for machining crankshaft flange surface includes a steel substrate and a ceramic bond CBN working layer bonded to the steel substrate, wherein the working layer is formed by splicing a plurality of special-shaped ceramic bond CBN agglomerates; wherein the special-shaped ceramic bond CBN agglomerates are prepared from CBN abrasives, ceramic bond, white corundum, pore-forming agent, and phenolic resin liquid.

[0034] The preparation method of the above-mentioned special-shaped ceramic bond CBN grinding wheel for machining crankshaft flange surface is as follows: (1) Silicon dioxide, aluminum oxide, boric acid, potassium carbonate, calcium carbonate and zinc oxide are uniformly mixed in a mass ratio of 43:27:17:9:4, and then smelted in a frit furnace at 1500° C. The molten material falls into water and is rapidly cooled and then wet-milled by a ball mill. The powder is dried at 180° C. and then sieved. The powder that can pass through a 600-mesh standard sieve but cannot pass through an 800-mesh standard sieve is taken to obtain a ceramic binder; (2) CBN abrasive, ceramic binder, white corundum, pore former, and resin liquid are mixed in a mass ratio of 48:19:18:8:7. Specifically, CBN abrasive, ceramic binder, white corundum, and pore former are put into a three-dimensional mixer for 120 min, and then the resin liquid is added and stirred evenly to obtain a working layer mixture; (3) Preparation of ceramic binder CBN special-shaped agglomerate body: according to the shape of the crankshaft flange surface, the working layer mixture is put into the mold cavity, and the entire mold is placed in a press to obtain a ceramic binder CBN special-shaped agglomerate body. Figures 2 to 3The specific feeding operation is as follows: first, in the mold frame, assemble the front section outer cylindrical surface and end face module, the front section outer cylindrical surface module, the rear section outer cylindrical surface and end face module, and the rear section outer cylindrical surface module in sequence, feed the first component outer cylindrical surface of the special-shaped agglomerate blank, scrape out the curvature, and put it into the upper support body of the first component outer cylindrical surface of the special-shaped agglomerate blank; then feed the second component outer cylindrical surface and end face of the special-shaped agglomerate blank, scrape out the curvature, and put it into the upper support body of the second component outer cylindrical surface and end face of the special-shaped agglomerate blank; on the upper support body of the first component outer cylindrical surface and the second component outer cylindrical surface and end face A parallel auxiliary pressure module is placed on the upper support body, and the parallel auxiliary pressure module is knocked to make the upper support body of the outer cylindrical surface of the first component and the upper support body of the outer cylindrical surface and end surface of the second component in the same plane; the mold is turned over, and the parallel auxiliary pressure module is placed, and the parallel auxiliary pressure module is knocked to make the front end outer cylindrical module, the front end face module, the rear end outer cylindrical module, and the rear end face module parallel; the mold is placed in a press as a whole, and the pressure is set to 25 tons and the holding time is 80 seconds. After demolding, a ceramic binder CBN special-shaped agglomerated green body is obtained, and the curvature of the adhesive portion thereof is fitted with the substrate; (4) The ceramic binder CBN special-shaped agglomerate is placed in an electric furnace in air. The sintering curve is: heating from room temperature to 500°C in 4 hours, keeping it at this temperature for 3 hours, then heating to 800°C in 2 hours, keeping it at this temperature for 1 hour, then heating to 950°C in 4 hours, keeping it at this temperature for 2 hours, and then cooling down with the furnace to obtain the ceramic binder CBN special-shaped agglomerate. See Figure 4 ; (5) The ceramic bond CBN special-shaped agglomerates are bonded (using conventional epoxy resin glue) on the steel substrate to form a ceramic bond CBN working layer through seamless splicing, and then subjected to conventional mechanical processing to obtain a crankshaft flange surface grinding wheel.

[0035] Comparative Example On the basis of Example 1, a ceramic binder was prepared from silicon dioxide, aluminum oxide, boron gangue, sodium carbonate, calcium carbonate, and magnesium oxide in a mass ratio of 43:27:15:10:5 to obtain a comparative CBN grinding wheel 1.

[0036] On the basis of Example 1, the pore-forming agent was replaced with hollow aluminum oxide balls, and the rest remained unchanged, thereby obtaining a comparative CBN grinding wheel 2.

[0037] On the basis of Example 1, silicon dioxide, aluminum oxide, boric acid, potassium carbonate, calcium carbonate and zinc oxide were mixed in a mass ratio of 48:20:13:14:5 to obtain a comparative grinding wheel 3. Embodiment 2

[0038] On the basis of Example 1, the second component is added first, and then the first component is added, and the rest remains unchanged to obtain a grinding wheel for machining the crankshaft flange surface, indicating that the order of adding materials has almost no effect. Embodiment 3

[0039] On the basis of Example 1, the mass ratio of CBN abrasive, vitrified binder, white corundum, pore former and resin liquid was adjusted to 53:16:16:8:7, and the rest remained unchanged to obtain a grinding wheel for machining crankshaft flange surface.

[0040] The ceramic bond CBN grinding wheel of the present invention is compared with the existing crankshaft flange grinding wheel for machining the crankshaft flange surface in parallel experiments. The parameters and results are shown in Table 1. The experimental equipment is shown in Figure 5 , the grinding wheel is installed in the middle, equipment: Landis, grinding wheel speed: 90m / s, roundness required <10 microns, roughness Ra <0.35.

[0041] Table 1 Processing parameters and effects of the ceramic grinding wheel of the present invention and the existing grinding wheel

[0042] As shown in Table 1, compared with the existing crankshaft flange grinding wheel (an imported product with good performance among similar products), the special-shaped ceramic bond CBN grinding wheel of the present invention is simple to operate, has a short delivery cycle, and saves abrasives and other raw materials. When the grinding wheel of the present invention is used to process the crankshaft flange surface, the workpiece has higher precision, better roughness, and longer dressing interval.

[0043] The present invention adopts a new technical idea and prepares a new formula with existing raw materials. It can realize the preparation of a ceramic binder CBN special-shaped agglomerate blank that matches the shape of the crankshaft flange surface through a one-time integral pressing process through a cold pressing process, and then conventionally sintering to obtain a ceramic binder CBN special-shaped agglomerate, which overcomes the technical bias of the prior art of first preparing a conventional shape agglomerate and then grinding it to the target shape with a large margin, and also solves the problem of the prior art of using a step-by-step preparation of the end face grinding layer and the outer cylindrical grinding layer. In particular, the formula of the present invention can not only form a blank with a certain strength and shape structure that matches the relevant curved surface in one-time molding during cold pressing, but also maintain the shape structure of the agglomerate during the sintering process, without cracking or void defects, so that the obtained grinding wheel has a very good processing effect.

Claims

1. A ceramic bond CBN grinding wheel for machining a special-shaped crankshaft flange surface, comprising a substrate and a ceramic bond CBN working layer bonded to the substrate, characterized in that: The ceramic binder CBN working layer is formed by splicing ceramic binder CBN special-shaped agglomerates; the ceramic binder CBN special-shaped agglomerates are formed by cold-pressing CBN abrasives, ceramic binder, white corundum, pore-forming agent, and phenolic resin liquid in one-time integral pressing and high-temperature sintering; the ceramic binder is prepared from silicon dioxide, aluminum oxide, boric acid, potassium carbonate, calcium carbonate, and zinc oxide.

2. The ceramic bond CBN grinding wheel for machining the crankshaft flange surface according to claim 1, characterized in that: The pore-forming agent is carbon powder.

3. The ceramic bond CBN grinding wheel for machining the crankshaft flange surface according to claim 1, characterized in that: The mass ratio of CBN abrasive, ceramic binder, white corundum, pore former and phenolic resin liquid is (40-60): (15-25): (12-25): (4-11): (2-9); the mass ratio of silicon dioxide, aluminum oxide, boric acid, potassium carbonate, calcium carbonate and zinc oxide is (38-47): (22-32): (13-22): (5-10): (2-5).

4. The method for preparing the special-shaped ceramic bond CBN grinding wheel for machining the crankshaft flange surface according to claim 1 comprises the following steps: (1) Mixing CBN abrasive, ceramic binder, white corundum, pore-forming agent, and phenolic resin liquid to obtain a working layer mixture; (2) adding the working layer mixture into the mold cavity and pressing the whole body into shape by cold pressing process at one time to obtain a ceramic binder CBN special-shaped agglomerated green body; (3) sintering the ceramic binder CBN special-shaped agglomerate green body to obtain the ceramic binder CBN special-shaped agglomerate; (4) The ceramic bond CBN special-shaped agglomerates are bonded to the substrate to form a ceramic bond CBN working layer, thereby obtaining a ceramic bond CBN grinding wheel for machining the special-shaped crankshaft flange surface.

5. The method for preparing a special-shaped ceramic bond CBN grinding wheel for machining a crankshaft flange surface according to claim 4, characterized in that: In step (1), the ceramic binder is prepared by melting, rapidly cooling and pulverizing silicon dioxide, aluminum oxide, boric acid, potassium carbonate, calcium carbonate and zinc oxide.

6. The method for preparing a special-shaped ceramic bond CBN grinding wheel for machining a crankshaft flange surface according to claim 4, characterized in that: In step (2), the working layer mixture is put into the mold cavity, and the entire mold is placed in a press for pressing, the pressure is set to 10 to 30 tons, and the pressure holding time is 60 to 90 seconds; after demolding, a ceramic binder CBN special-shaped agglomerate green body is obtained.

7. The method for preparing a special-shaped ceramic bond CBN grinding wheel for machining a crankshaft flange surface according to claim 4, characterized in that: In step (3), sintering is carried out in air, and the process is to heat from room temperature to 450-550°C over 3-5 hours, keep warm for 2.5-3.5 hours, then heat to 700-900°C over 1-3 hours, keep warm for 0.5-1.5 hours, then heat to 900-1000°C over 3.5-5 hours, keep warm for 1.5-2.5 hours, and then cool down with the furnace.

8. The method for preparing a special-shaped ceramic bond CBN grinding wheel for machining a crankshaft flange surface according to claim 4, characterized in that: The substrate is a steel substrate.

9. Use of the ceramic bond CBN grinding wheel for machining the special-shaped crankshaft flange surface as claimed in claim 1 in preparing a crankshaft flange surface machining abrasive tool, or use of the ceramic bond CBN grinding wheel for machining the special-shaped crankshaft flange surface as claimed in claim 1 in machining the crankshaft flange surface.

10. A method for machining a crankshaft flange surface, comprising machining the crankshaft flange surface using the special-shaped ceramic bond CBN grinding wheel for machining the crankshaft flange surface according to claim 1.

Images