Grinding treatment method and device for cobalt-based tungsten carbide coating on surface of titanium alloy

Abstract

The invention discloses a titanium alloy surface cobalt-based tungsten carbide coating grinding treatment method and a titanium alloy surface cobalt-based tungsten carbide coating grinding treatment device, and belongs to the field of metal hardness coating grinding of aircraft manufacturing technics.A positive electrode is applied to a grinding wheel with the surface provided with a metal bonding agent, and negative electrodes are applied to the outer surface of the grinding wheel with the surface provided with the metal bonding agent at intervals; positive electrode voltage applied to the grinding wheel and negative electrode voltage applied to the outer surface of the grinding wheel are set; the electrolytic effect is achieved by applying voltage to the grinding wheel, a hard metal bonding agent on the surface layer of the grinding wheel generates a passivation insulating film layer capable of containing a large amount of fine grinding materials on the surface of the grinding wheel, the grinding wheel is continuously sharpened through dynamic balance of the passivation insulating film layer on the electrolytic inhibition effect, and grinding wheel abrasive particles obtain the constant protruding amount; therefore, the stable and controllable grinding process is achieved, and the problems that in an existing method, pure mechanical grinding is adopted, the grinding precision of the surface of the cobalt-based tungsten carbide coating is low, and surface quality damage is large are solved. The method has the characteristic of eliminating grinding failure caused by abrasion of the granularity of the grinding wheel.

Description

Technical Field

[0001] The present application belongs to the field of metal high-hardness coating grinding in aircraft manufacturing technology, and specifically relates to a grinding treatment method and device for a cobalt-based tungsten carbide coating on a titanium alloy surface. Background Art

[0002] Titanium alloys have the characteristics of high specific strength, excellent heat resistance, strong corrosion resistance, etc. They are widely used in aerospace, military industry, mechanical processing and other fields. In order to enhance the wear resistance and corrosion resistance of the friction pairs of titanium alloy parts, cobalt-based tungsten carbide coatings can be sprayed on titanium alloy substrates. The cobalt-based tungsten carbide coating is formed by supersonic flame spraying of the coating onto the substrate. Due to the influence of the flame spraying process, the surface roughness and coating uniformity of titanium alloy parts do not meet the technical requirements, and the coating surface needs to be ground. However, due to the low bonding strength between the flame sprayed layer and the substrate, it is more sensitive to alternating loads and impact loads. After spraying, the parts become a structure with a soft core and a hard surface. If the grinding process is not properly controlled, the coating is mainly brittle and has fewer plastic changes during the grinding process. The coating that undergoes brittle deformation is prone to severe network cracks, and it is difficult to obtain good surface quality.

[0003] Traditional grinding processes mostly use grinding wheels directly, and the grinding quality of titanium alloy coating surface is controlled by controlling grinding process parameters such as grinding wheel cutting depth and workpiece speed. However, the high hardness and high wear resistance of cobalt-based tungsten carbide coating (WC-17Co coating) make the grinding wheel wear seriously during grinding, easy to clog, passivate, and abrasive particles fall off, reducing grinding efficiency, and making it difficult to ensure grinding accuracy. At present, research on the grinding of WC-17Co coatings at home and abroad is very limited, and most of them are focused on the material removal mechanism and the improvement of coating structure and performance after grinding. The grinding accuracy of high-strength coatings is low and the surface quality is greatly damaged. Summary of the invention

[0004] The purpose of the present invention is to provide a method and device for grinding a cobalt-based tungsten carbide coating on a titanium alloy surface, so as to overcome the problems of low grinding precision and great surface quality damage of the cobalt-based tungsten carbide coating surface in the prior art.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A grinding treatment method for a cobalt-based tungsten carbide coating on a titanium alloy surface comprises the following steps: A positive electrode is applied to a grinding wheel with a metal binder on the surface, a negative electrode is applied to the outer surface of the grinding wheel with a metal binder on the surface, and a voltage of the positive electrode applied to the grinding wheel and the negative electrode applied to the outer surface of the grinding wheel is set; The grinding wheel is used to grind the rotating surface of the workpiece to be processed. The linear speed of the grinding wheel is 28~40m / s, and the rotation speed of the workpiece to be processed is 30~150r / min.

[0006] Preferably, before grinding the surface of the workpiece to be processed, the surface of the workpiece to be processed is cleaned.

[0007] Preferably, the voltage of the positive electrode applied to the grinding wheel and the negative electrode applied to the outer surface of the grinding wheel is 120V.

[0008] Preferably, during the grinding process, the negative electrode gradually approaches the outer surface of the grinding wheel, the feed speed is 1 μm / min, and the grinding coolant uses cutting fluid with a flow rate of not less than 0.5 L / min.

[0009] Preferably, the grinding wheel moving speed is V w =0.1~0.2m / min, the grinding wheel abrasive angle is 45°.

[0010] Preferably, the negative electrode is spaced apart from the outer surface of the grinding wheel provided with a metal binder, and the spacing distance is 0.1-0.3 mm.

[0011] Preferably, the grinding of the workpiece to be processed by the grinding wheel includes rough grinding and fine grinding, and the cutting depth f of the rough grinding is r =0.003~0.005mm / r, cutting depth f for fine grinding r =0.001~0.002mm / r.

[0012] A grinding processing device for a cobalt-based tungsten carbide coating on a titanium alloy surface comprises a machine tool worktable for placing a workpiece to be processed and a grinding wheel for grinding, wherein the grinding wheel is connected to a positive electrode of a power supply, sharpening electrodes are arranged at intervals on the grinding wheel, the sharpening electrodes are connected to a cathode of the power supply, and a grinding coolant pipe is arranged on the sharpening electrode.

[0013] Preferably, the voltage between the grinding wheel connected to the positive pole of the power supply and the dressing electrode is 120V, and the distance between the dressing electrode and the outer surface of the grinding wheel with a metal binder on the surface is set to 0.1-0.3mm.

[0014] Preferably, the grinding wheel is a diamond grinding wheel, and a layer of cast iron binder is coated on the abrasive grains of the diamond grinding wheel.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides a grinding treatment method for a cobalt-based tungsten carbide coating on a titanium alloy surface, wherein a positive electrode is applied to a grinding wheel with a metal binder on the surface, a negative electrode is applied to the outer surface of the grinding wheel with a metal binder on the surface, and the voltage of the positive electrode applied to the grinding wheel and the negative electrode applied to the outer surface of the grinding wheel are set; an electrolysis is achieved by applying a voltage to the grinding wheel, so that the hard metal binder on the surface of the grinding wheel forms a passivation insulating film layer on the surface of the grinding wheel that can accommodate a large amount of fine abrasives, and the dynamic balance of the passivation insulating film layer on the electrolysis inhibition is utilized to continuously sharpen the grinding wheel, so that the grinding wheel abrasive grains obtain a constant protrusion amount, thereby realizing a stable and controllable grinding process, and solving the problem of low grinding precision and large surface quality damage of the cobalt-based tungsten carbide coating surface by pure mechanical grinding in the existing method. It has the characteristic of eliminating the grinding failure caused by the wear of the grinding wheel particle size.

[0016] The invention provides a grinding processing device for a cobalt-based tungsten carbide coating on a titanium alloy surface, comprising a machine tool worktable for placing a workpiece to be processed and a grinding wheel for grinding, wherein the grinding wheel is connected to a positive electrode of a power supply, sharpening electrodes are arranged at intervals on the grinding wheel, the sharpening electrodes are connected to a cathode of the power supply, and a grinding coolant pipe is arranged on the sharpening electrode. The device has a simple process, combines the dressing of the grinding wheel with the grinding process, utilizes electrolysis to dress the grinding wheel, avoids passivation and clogging of the grinding wheel, realizes ultra-precision grinding of hard and brittle materials, can effectively reduce the risk of burns, and improves the accuracy of workpiece grinding processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a schematic diagram of the process of grinding a cobalt-based tungsten carbide coating on a titanium alloy surface according to an embodiment of the present invention.

[0018] Figure 2 Schematic diagram of the structure of the grinding treatment device for the cobalt-based tungsten carbide coating on the surface of titanium alloy in an embodiment of the present invention.

[0019] Figure 3 Schematic diagram of the electrolytic sharpening structure of the grinding wheel surface in an embodiment of the present invention.

[0020] In the figure, 1. machine tool worktable; 2. workpiece to be processed; 3. grinding wheel; 4. grinding fluid pipe; 5. grinding coolant pipe; 6. sharpening electrode; 7. AC power box. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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 should fall within the scope of protection of the present invention.

[0022] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] like Figure 1 As shown, in a specific embodiment of the present invention, a grinding treatment method for a cobalt-based tungsten carbide coating on a titanium alloy surface is provided, which specifically grinds the surface of a workpiece continuously by electrolytic sharpening + mechanical scraping, and specifically includes the following steps: S1, applying a positive electrode to a grinding wheel with a metal binder on the surface, applying a negative electrode to the outer surface of the grinding wheel with a metal binder on the surface, and setting the voltage of the positive electrode applied to the grinding wheel and the negative electrode applied to the outer surface of the grinding wheel; S2, grinding the rotating surface of the workpiece to be processed by using a grinding wheel, the linear speed of the grinding wheel is 28~40m / s, and the rotation speed of the workpiece to be processed is 30~150r / min.

[0024] The present invention applies a positive electrode to a grinding wheel structure. Specifically, the electrode material for applying the positive electrode on the grinding wheel is copper or graphite, which has good conductivity and stability and is suitable for use in the electrolytic dressing process.

[0025] In a specific implementation of the present application, the voltage of the positive electrode applied to the grinding wheel and the negative electrode applied to the outer surface of the grinding wheel is 120V; the negative electrode is spaced apart from the outer surface of the grinding wheel with a metal binder on the surface, and the spacing distance is 0.1~0.3mm; during the grinding process, the negative electrode gradually approaches the outer surface of the grinding wheel, the feed speed is 1μm / min, and the grinding coolant 5 uses cutting fluid and the flow rate is not less than 0.5L / min.

[0026] In a specific embodiment of the present application, a voltage is applied to the grinding wheel to achieve electrolysis, so that the hard metal binder on the surface of the grinding wheel forms a passivation insulating film layer on the surface of the grinding wheel that can accommodate a large amount of fine abrasives. The dynamic balance of the electrolysis inhibition effect of the passivation insulating film layer is utilized to continuously sharpen the grinding wheel so that the abrasive grains of the grinding wheel obtain a constant protrusion amount, thereby realizing a stable and controllable grinding process.

[0027] In the specific implementation of the present application, before grinding the surface of the workpiece to be processed, the surface of the workpiece to be processed needs to be cleaned, specifically, the workpiece to be processed is ultrasonically cleaned to remove water and oil, and then blown dry for use. At the same time, the surface of the workpiece to be processed needs to be inspected for penetration to ensure that the workpiece to be processed has no cracks.

[0028] Specifically, before grinding, use ultrasonic cleaning or use a rag dipped in industrial alcohol or industrial acetone to clean the surface of the workpiece to ensure that there is no surface contaminants such as grease, lubricating oil, dirt and dust on the surface of the part, and then blow it dry for use.

[0029] In one embodiment of the present invention, a device for grinding the cobalt-based tungsten carbide coating on the surface of the above-mentioned titanium alloy is provided, which specifically includes a machine tool worktable 1 for placing a workpiece 2 to be processed and a grinding wheel 3 for grinding; the workpiece 2 to be processed is driven by the machine tool worktable 1 to rotate, the grinding wheel 3 is arranged on the upper end of the workpiece 2 to be processed, and can grind the workpiece 2 to be processed, the grinding wheel 3 is connected to the positive pole of the power supply, and at the same time, sharpening electrodes 6 are arranged on the grinding wheel 3 at intervals, the sharpening electrodes 6 are connected to the negative pole of the power supply, and the sharpening electrodes 6 and the positive pole of the power supply on the grinding wheel 3 can realize electrolysis of the grinding wheel 3; a grinding coolant pipe 5 is arranged on the sharpening electrode 6, and the grinding coolant pipe 5 is used to provide grinding coolant between the sharpening electrode 6 and the grinding wheel 3, and the grinding fluid required for the grinding process is provided through the grinding fluid pipe 4 during the grinding process of the grinding wheel 3 and the workpiece 2 to be processed. The positive pole of the power supply on the dressing electrode 6 and the grinding wheel 3 is connected to the AC power box 7, and the electrolytic voltage is provided by the AC power box 7. The workpiece is ground by online electrolytic dressing of the grinding wheel during the grinding process, so that the thickness of the electrolytic oxide film reaches a dynamic balance, and the abrasive is continuously exposed to ensure the sharpness of the metal-based grinding wheel during the grinding process, thereby achieving low cutting force, high precision and high efficiency grinding.

[0030] In a specific embodiment of the present application, a diamond grinding wheel is used as the grinding wheel; a layer of cast iron binder is coated on the abrasive grains of the diamond grinding wheel to control the breakage and shedding of the abrasive grains, which helps to improve the grinding efficiency and stability of the grinding wheel.

[0031] Specifically, in the specific implementation of the present application, the electrode is directly connected to the side of the grinding wheel or the grinding wheel shaft through a copper brush or other conductive device. This connection method is simple and direct, and is easy to maintain. The dressing electrode 6 and the grinding wheel are fixedly installed through a bracket to ensure stability and accuracy during the processing. In order to adjust the distance and angle between the dressing electrode 6 and the grinding wheel, the dressing electrode 6 is fixed to one side of the grinding wheel by adjusting the bracket, and the operator can fine-tune the position of the dressing electrode 6 according to the processing requirements.

[0032] The present application utilizes the grinding coolant pipe 5 to provide the grinding coolant to the grinding wheel, while ensuring the smooth progress of the electrolysis process. The grinding coolant is introduced into the area between the grinding wheel and the negative electrode. Through the rotation of the grinding wheel and the action of centrifugal force, the grinding coolant can evenly cover the entire processing area and play a conductive role.

[0033] like Figure 2 As shown, in a specific embodiment of the present application, the surface of the dressing electrode 6 close to the grinding wheel 3 is a curved surface, and the curved surface of the dressing electrode 6 is wrapped around the outside of the grinding wheel 3, forming a relatively large electrolytic reaction area on the surface of the grinding wheel. The sharpness of the grinding wheel can be ensured through the electrolytic reaction, and when the dressed grinding wheel is rotated to the surface of the workpiece, the surface of the workpiece is effectively ground.

[0034] In the specific embodiment of the present application, the machine tool worktable 1 specifically adopts a surface grinder, which includes vertical and horizontal types. The vertical surface grinder uses the end face of the grinding wheel to grind the surface, and the horizontal surface grinder uses the circumferential surface of the grinding wheel to grind the surface. The vertical surface grinder is used in the specific embodiment of the present application.

[0035] In a specific embodiment of the present application, the voltage between the grinding wheel 3 connected to the positive pole of the power supply and the sharpening electrode 6 is 120V, and the interval between the sharpening electrode 6 and the outer surface of the grinding wheel with a metal binder on the surface is set to 0.1~0.3mm; during the grinding process, the negative electrode gradually approaches the outer surface of the grinding wheel, the feed speed is 1μm / min, and the grinding coolant 5 uses cutting fluid and the flow rate is not less than 0.5L / min.

[0036] When grinding the rotating workpiece surface with a grinding wheel, the grinding wheel moves relative to the workpiece while rotating. The grinding wheel moves along the axis perpendicular to its rotation. The speed of the grinding wheel is V. w =0.1~0.2m / min, the grinding wheel abrasive angle is 45°.

[0037] When grinding the rotating workpiece surface with a grinding wheel, the rotation speed of the workpiece is 30~150r / min; the cutting depth of the grinding wheel on the workpiece is f r .

[0038] In the specific implementation of the present application, the grinding of the workpiece to be processed by the grinding wheel includes rough grinding and fine grinding, and the cutting depth f of the rough grinding is r =0.003~0.005mm / r, cutting depth f for fine grinding r=0.001~0.002mm / r; synthetic emulsion or rust-proof water-based coolant is used for rough grinding, and M-5B3 long-acting high-speed precision grinding fluid is used for fine grinding. During fine grinding, due to the small feed rate, the thickness of the passivation film is much greater than the exposed height of the abrasive, so that the abrasive on the surface of the grinding wheel matrix does not directly contact the workpiece during the grinding process, and the passivation film will participate in the grinding instead of the grinding wheel; when the electrolytic action is completely suppressed, the passivation film is used to complete the light grinding of the workpiece.

[0039] Example 1 This application is described with a titanium alloy part coated with a cobalt-based tungsten carbide coating on the surface as a specific embodiment: First, the titanium alloy parts treated by supersonic flame spraying are ultrasonically cleaned to remove water, oil and blown dry for standby use; Then the titanium alloy parts sprayed with WC-17Co by HVOF were subjected to penetration inspection to ensure that the ground parts were free of cracks; In the embodiment of the present application, a surface grinder is used as an installation and processing bed for the workpiece 2 to be processed, the workpiece 2 to be processed that has been detected to be free of cracks and cleaned is fixed and installed, and then the copper brush is connected to the grinding wheel shaft of the grinding wheel, the copper brush is connected to the positive pole of the alternating current, and the negative pole of the alternating current is connected to the sharpening electrode 6, and the distance between the sharpening electrode 6 and the workpiece 2 to be processed is adjusted by using an adjustment bracket; a voltage is applied to a diamond grinding wheel containing a cast iron binder to control the eccentricity of the grinding wheel and improve the roundness and sharpness of the grinding wheel; the grinding wheel is used to grind the rotating surface of the workpiece to be processed, the linear speed of the grinding wheel is 28~40m / s, and the rotation speed of the workpiece to be processed is 30~150r / min, so as to achieve a reasonable coordination of electrolysis and mechanical scraping, and grind the titanium alloy parts that have been checked to be free of cracks; finally, after grinding, the workpiece is cleaned and a secondary fluorescent penetration inspection is performed.

[0040] In a specific embodiment of the present application, the cobalt-based tungsten carbide coating sprayed on the surface of the titanium alloy is ground to obtain a good surface quality of the titanium alloy part, which specifically includes the following steps: The surface of the titanium alloy part to be treated, which is sprayed with a cobalt-based tungsten carbide coating, is cleaned to ensure that there is no contaminant on the surface. Then, a fluorescent penetration inspection is performed on the surface of the titanium alloy part to be treated to ensure that there is no crack on the surface of the titanium alloy part to be treated.

[0041] Then fix the titanium alloy part to be processed on the grinding machine, set the rotation speed of the titanium alloy part to be processed to 30r / min, and use the adjusting bracket to adjust the gap between the grinding wheel and the surface of the titanium alloy part to be processed to 0.1mm; adjust the gap between the grinding wheel and the sharpening electrode to 0.1mm, and the electrode voltage to 120V. Use the anodic dissolution effect in the electrolysis process to electrolytically remove the metal matrix on the surface of the grinding wheel, thereby gradually exposing sharp new abrasive grains. At the same time, a passivation film is formed on the surface of the grinding wheel to inhibit excessive electrolysis of the grinding wheel, so that the thickness of the electrolytic oxide film reaches a dynamic balance, so that the grinding wheel is always in the best grinding state.

[0042] Set the linear speed of the grinding wheel to 28m / s and the cutting speed of the grinding wheel to V w =0.1m / min; the cutting depth is 0.003mm / r, and the workpiece is ground using synthetic emulsion as the base coolant until the set grinding thickness is reached. Then the WC-17Co coating of the ground titanium alloy parts is inspected by fluorescent penetration to ensure that there are no cracks in the coating of the ground parts. The surface of the ground titanium alloy parts is tested to meet the set requirements.

[0043] Example 2 The present application grinds the cobalt-based tungsten carbide coating sprayed on the surface of the titanium alloy by a combination of rough grinding and fine grinding. Before the grinding process, the surface of the titanium alloy part to be treated is cleaned to ensure that there are no contaminants on the surface. Then, the surface of the titanium alloy part to be treated is subjected to a fluorescent penetration inspection to ensure that there are no cracks on the surface of the titanium alloy part to be treated.

[0044] In this embodiment, the same grinding machine and adjustable bracket structure as those in the above method are used to fix and install the titanium alloy parts to be processed, the rotation speed of the titanium alloy parts to be processed is set to 150r / min, and the gap between the grinding wheel and the surface of the titanium alloy parts to be processed is adjusted to 0.3mm; the gap between the grinding wheel and the sharpening electrode is adjusted to 0.3mm, and the electrode voltage is 120V. The anodic dissolution effect in the electrolysis process is used to electrolytically remove the metal matrix on the surface of the grinding wheel, thereby gradually exposing sharp new abrasive grains, and at the same time forming a passivation film on the surface of the grinding wheel to inhibit excessive electrolysis of the grinding wheel, so that the thickness of the electrolytic oxide film reaches a dynamic balance, so that the grinding wheel is always in the best grinding state. Figure 2 The area 9 shown in FIG. 1 is the trimmed area.

[0045] Set the linear speed of the grinding wheel to 35m / s and the cutting speed of the grinding wheel to V w =0.2m / min; first grind 60% with a cutting depth of 0.004mm / r, and then grind the remaining part with a cutting depth of 0.001mm / r; the grinding wheel 3 performs mechanical grinding on the workpiece 2 to produce a scraping effect, and the sand particles begin to wear and are in the grinding area, such as Figure 2 As shown in the middle area 10; as the grinding wheel continues to rotate, the worn and blunted sand particles leave the workpiece surface and enter the area to be sharpened, such as Figure 2 As shown in the middle area 11; at the same time, during fine grinding, the passivation film replaces the grinding wheel to perform contact grinding and polishing with the workpiece to achieve high-precision grinding; the present invention uses rust-proof water as the base coolant during the grinding process, and then performs a fluorescent penetration inspection on the WC-17Co coating of the ground titanium alloy parts. The coating of the ground parts has no cracks, and the surface of the ground titanium alloy parts is tested to meet the set requirements.

[0046] Example 3 The present application uses a fine grinding method to grind the cobalt-based tungsten carbide coating sprayed on the surface of the titanium alloy. Before the grinding process, the surface of the titanium alloy part to be processed is cleaned and subjected to a fluorescent penetration inspection process to ensure that there are no cracks on the surface of the titanium alloy part to be processed.

[0047] Similarly, the same grinding machine as the above method is used to fix and install the titanium alloy parts to be processed and the bracket structure is adjusted. The rotation speed of the titanium alloy parts to be processed is set to 100r / min, and the gap between the grinding wheel and the surface of the titanium alloy parts to be processed is adjusted to 0.2mm; the gap between the grinding wheel and the sharpening electrode is adjusted to 0.2mm, the electrode voltage is 120V, the linear speed of the grinding wheel is set to 100m / s, and the feed speed of the grinding wheel is V w =0.2m / min; grinding is performed at a cutting depth of 0.001mm / r, and the workpiece 2 to be processed is mechanically ground by the grinding wheel 3. As the grinding wheel continues to rotate, the worn and blunt sand particles leave the surface of the workpiece and enter the area to be sharpened. The passivation film replaces the grinding wheel to perform contact grinding and polishing with the workpiece to achieve high-precision grinding. The WC-17Co coating of the ground titanium alloy part is subjected to fluorescent penetration inspection by the method of the present invention. The coating of the ground part is free of cracks, and the surface of the ground titanium alloy part is inspected to meet the use requirements of the workpiece to be processed.

[0048] The present invention continuously grinds the surface of the part to be processed by electrolytically sharpening the grinding wheel, and the generated grinding force is small, which can reduce the risk of burns and improve the problem that the grinding wheel needs to run 8 to 10 idle strokes to reduce thermal stress in traditional grinding, resulting in a reduction in production cycle; the combined grinding of the present invention forms a closed-loop ecosystem to ensure the continuity of production, and solves the problems that diamond abrasive grains in ordinary mechanical grinding are easy to fall off and scratch the processed workpiece, and the grinding wheel needs to be cleaned once every 0.02mm margin to prevent clogging of the grinding wheel. The present invention has the characteristic of eliminating grinding failure caused by wear of the grinding wheel particle size. The method of the present invention combines the dressing of the grinding wheel with the grinding process, and uses nonlinear electrolysis to dress the grinding wheel, thereby avoiding passivation and clogging of the grinding wheel, realizing ultra-precision grinding of hard and brittle materials, and effectively reducing the risk of burns.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A grinding treatment method for a cobalt-based tungsten carbide coating on a titanium alloy surface, characterized in that: The following steps are involved: A positive electrode is applied to a grinding wheel with a metal binder on the surface, a negative electrode is applied to the outer surface of the grinding wheel with a metal binder on the surface, and a voltage of the positive electrode applied to the grinding wheel and the negative electrode applied to the outer surface of the grinding wheel is set; The grinding wheel is used to grind the rotating surface of the workpiece to be processed. The linear speed of the grinding wheel is 28~40m / s, and the rotation speed of the workpiece to be processed is 30~150r / min.

2. The grinding treatment method of cobalt-based tungsten carbide coating on titanium alloy surface according to claim 1, characterized in that: Before grinding the surface of the workpiece to be processed, the surface of the workpiece to be processed is cleaned.

3. The grinding treatment method of cobalt-based tungsten carbide coating on titanium alloy surface according to claim 1, characterized in that: The positive electrode voltage applied to the grinding wheel and the negative electrode voltage applied to the outer surface of the grinding wheel are 120V.

4. The grinding treatment method of cobalt-based tungsten carbide coating on titanium alloy surface according to claim 1, characterized in that: During the grinding process, the negative electrode gradually approaches the outer surface of the grinding wheel, the feed speed is 1 μm / min, and the grinding coolant uses cutting fluid with a flow rate of not less than 0.5 L / min.

5. The grinding treatment method of cobalt-based tungsten carbide coating on titanium alloy surface according to claim 1, characterized in that: The speed of the grinding wheel is V w =0.1~0.2m / min, the grinding wheel abrasive angle is 45°.

6. The grinding treatment method of cobalt-based tungsten carbide coating on titanium alloy surface according to claim 1, characterized in that: The negative electrode is spaced apart from the outer surface of the grinding wheel with a metal binder on the surface, and the spacing distance is 0.1-0.3 mm.

7. The grinding treatment method of cobalt-based tungsten carbide coating on titanium alloy surface according to claim 1, characterized in that: Grinding the workpiece with a grinding wheel includes rough grinding and fine grinding. The cutting depth of rough grinding is f r =0.003~0.005mm / r, cutting depth f for fine grinding r =0.001~0.002mm / r.

8. A grinding treatment device for cobalt-based tungsten carbide coating on titanium alloy surface, characterized in that: The invention comprises a machine tool worktable (1) for placing a workpiece (2) to be processed and a grinding wheel (3) for grinding, wherein the grinding wheel (3) is connected to a positive electrode of a power supply, sharpening electrodes (6) are arranged at intervals on the grinding wheel (3), the sharpening electrodes (6) are connected to a cathode of the power supply, and a grinding coolant pipe (5) is arranged on the sharpening electrode (6).

9. A grinding treatment device for cobalt-based tungsten carbide coating on titanium alloy surface according to claim 8, characterized in that: The voltage between the grinding wheel (3) connected to the positive pole of the power supply and the sharpening electrode (6) is 120V, and the interval between the sharpening electrode (6) and the outer surface of the grinding wheel provided with a metal binder is set to 0.1-0.3 mm.

10. A grinding treatment device for cobalt-based tungsten carbide coating on titanium alloy surface according to claim 8, characterized in that: The grinding wheel is a diamond grinding wheel, and a layer of cast iron binder is coated on the abrasive grains of the diamond grinding wheel.

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