Passivating treatment system and method for ceramic cutter and application of passivating treatment system and method

Abstract

The invention provides a passivating treatment system and method for a ceramic cutter and application of the passivating treatment system and method. The method comprises the following steps that firstly, the ceramic tool to be treated is fixed in a tool clamping mechanism on a sand blasting platform; secondly, passivation parameters are set through a control panel, and the step distance between a nozzle and a sand blasting platform and the inclination angle of the nozzle are adjusted; thirdly, the position of a nozzle is adjusted through a mechanical arm; fourthly, the system is started, and under the action of an air compressor, the abrasive is conveyed to a nozzle through a sand blasting pipe; fifthly, a mechanical arm moves a nozzle according to a preset track, and passivating treatment is conducted on the to-be-treated ceramic tool; and 6, after passivation treatment is completed, the system is closed, and the treated ceramic cutter is obtained. According to the passivation treatment system and method provided by the invention, the ceramic cutter shows longer service life and higher cutting efficiency when cutting Inconel 718 alloy, and the quality of a machined surface is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of nickel-based high-temperature alloy processing, and in particular to a passivation treatment system, method and application of a ceramic tool. Background Art

[0002] Inconel 718 super heat-resistant alloy has excellent properties such as oxidation resistance, corrosion resistance, wear resistance and high-temperature creep resistance, so it is widely used in aerospace jets, ship turbine engines and automobile engines. In various fields of application, it needs to be machined (milling, grinding, turning, etc.). However, due to factors such as high thermal conductivity and strong chemical affinity with many tool materials, Inconel 718 is considered to be a difficult material to machine. Due to the work hardening and wear characteristics of Inconel718, the tool life is short; in addition, the extremely high cutting force leads to problems such as low surface quality of the workpiece. At present, the main tools for machining Inconel 718 are coated carbide tools and ceramic tools.

[0003] In recent years, carbide coated tools have been widely used in the processing of Inconel 718, but the cutting speed of most carbide tools is low, generally less than 100m / min, resulting in low processing efficiency. On the contrary, the cutting speed of most ceramic tools can be adjusted in a large range during the processing process, generally higher than 100m / min, so ceramic tools are more suitable for high-speed and efficient processing. So far, people have conducted experimental studies on the cutting performance of Inconel 718 using ceramic tools. The effect of cutting speed on tool wear and life when processing nickel-based superalloy Inconel718 has been studied. The experimental results show that at low cutting speeds, square blades show better cutting performance than circular blades, and the optimal cutting speed is 250m / min. At the beginning, the effects of cutting parameters, tool wear and coolant conditions on machined surface damage were experimentally studied, and the machined surface was analyzed by scanning electron microscopy (SEM) and high-resolution scanning electron microscopy (HRSEM). It is believed that the type and degree of surface damage depends on the cutting parameters, the size of the wear zone and the coolant conditions. Finally, it is concluded that the overall effect of cutting parameters on the degree of surface damage is far less than the effect of tool wear and coolant conditions on the degree of surface damage. Some studies have also been conducted on the performance of ceramic cutting teeth in Inconel 718 turning under two auxiliary processing conditions: plasma preheating and cryogenic cooling. When these two auxiliary technologies are used to process Inconel 718, tool wear is reduced and surface integrity is improved. In addition, the use of carbide tools and ceramic tools to turn the super heat-resistant alloy Inconel 718 has studied the variation of cutting forces and established an empirical model of cutting forces on cutting parameters. Finally, it is concluded that the cutting depth has the greatest influence on cutting forces, followed by f, and vc has the least influence.

[0004] In order to extend the service life of the tool and improve its surface integrity, the tool is usually pretreated. At present, the pretreatment method of ceramic cutting tools mainly includes low temperature treatment, which can enhance the wear resistance of whiskers and thus improve the overall wear resistance of the tool. Although sandblasting technology has been widely used on cemented carbide blades, and studies have shown that sandblasting technology can significantly improve the life and surface quality of the tool while making the cutting force more stable, there are still relatively few methods of using sandblasting technology to improve the performance of ceramic tools. Due to the different characteristics of ceramic materials and cemented carbide, the high hardness and brittleness of ceramic materials make it very easy to crack or surface damage during the sandblasting process, which may not only reduce the overall strength of the tool, but also cause early failure of the tool during use, further limiting the widespread application of this technology in ceramic tool pretreatment.

[0005] At present, the improvement of ceramic tool performance is mainly focused on the machining process, by adding cutting fluid and minimal lubrication (MQL) to increase the life of ceramic tools, but this method still has certain limitations. Therefore, it is urgent to develop a new passivation treatment method to extend the service life of ceramic tools and improve their surface integrity. Summary of the invention

[0006] In view of this, the present invention proposes a passivation treatment system and method for ceramic cutting tools with excellent service life and surface integrity. The ceramic cutting tools were passivated using wet abrasives and elastic abrasives respectively. By comparing the performance of the untreated and passivated cutting tools in cutting experiments, the effects of the above two methods on the performance of the ceramic cutting tools were evaluated. According to the analysis of the experimental results, it is concluded that the passivation treatment using elastic abrasives can greatly improve the service life and surface integrity of ceramic cutting tools, and the passivation technology increases the radius of the cutting edge and reduces the possibility of chipping during cutting.

[0007] The implementation process of the present invention is as follows:

[0008] In a first aspect, the present invention provides a passivation treatment system for ceramic tools, comprising an air compressor and a passivation treatment chamber connected by an air pipe, wherein a sandblasting machine and a sandblasting platform are arranged in the cavity of the passivation treatment chamber; the sandblasting machine comprises a mechanical arm, a sandblasting tube and a nozzle, wherein the mechanical arm is used to control the position and angle of the nozzle to ensure that the nozzle can move according to a preset trajectory to realize the passivation treatment of the ceramic tool to be processed placed on the sandblasting platform; the sandblasting tube is connected to the mechanical arm through the nozzle, and abrasive is transported to the nozzle through a pipeline; the nozzle is installed at one end of the sandblasting tube close to the sandblasting platform, the nozzle is arranged at an inclination angle of 40° to 50° relative to the horizontal plane where the sandblasting platform is located, and a step distance of 30 to 45 mm is maintained between the nozzle and the sandblasting platform; a control panel is arranged outside the passivation treatment chamber, and the control panel is used to control the operation of the system and adjust the passivation parameters;

[0009] A tool clamping mechanism is installed on the sandblasting platform. The tool clamping mechanism is located below the sandblasting machine and is used to fix the ceramic tool to be processed.

[0010] On the basis of the above technical solution, preferably, the preset trajectory of the robotic arm includes: adjusting the running trajectory, running speed and deflection direction of the nozzle of the robotic arm based on the function of the control panel.

[0011] On the basis of the above technical solution, preferably, the positioning accuracy of the robotic arm is ±0.05mm and the maximum movement speed is 1000mm / s.

[0012] On the basis of the above technical solution, preferably, the movement trajectory of the robotic arm is: the movement direction is parallel to the cutting edge of the ceramic tool to be processed, and the movement distance is greater than the length of the cutting edge.

[0013] On the basis of the above technical solution, preferably, the air compressor is used to provide compressed air or inert gas with a pressure of 200 to 400 KPa.

[0014] In a second aspect, the present invention relates to a passivation method for a ceramic tool based on the above-mentioned passivation treatment system, the method comprising the following steps:

[0015] Step 1: Fix the ceramic tool to be processed in the tool clamping mechanism on the sandblasting platform;

[0016] Step 2: Set the passivation parameters through the control panel, and adjust the step distance between the nozzle and the sandblasting platform and the inclination angle of the nozzle;

[0017] Step 3: Adjust the position of the nozzle through the robotic arm;

[0018] Step 4: Start the system, and under the action of the air compressor, the abrasive is transported to the nozzle through the sandblasting tube;

[0019] Step 5: The robot arm moves the nozzle according to a preset trajectory to passivate the ceramic tool to be processed;

[0020] Step 6: After the passivation treatment is completed, the system is turned off to obtain the treated ceramic tool.

[0021] On the basis of the above technical solution, preferably, in step 2, the passivation parameters include: the sandblasting pressure is 200-400 KPa, and the sandblasting duration is 30-120 s.

[0022] On the basis of the above technical solution, preferably, in step three, the position requirement is: the center line of the nozzle is aligned with the tip of the ceramic tool to be processed.

[0023] Based on the above technical solution, preferably, in step 4, the abrasive is an elastic abrasive.

[0024] On the basis of the above technical solution, preferably, in step six, the surface roughness of the treated ceramic tool is reduced to 0.07, and the cutting edge radius is 10-20 μm.

[0025] The ceramic tool passivation treatment system and passivation method provided by the present invention have the following beneficial effects compared with the prior art:

[0026] 1. A passivation treatment system and method for ceramic tools provided by the present invention significantly improves the service life and surface integrity of ceramic tools by accurately controlling various parameters in the sandblasting process. The system takes advantage of the high precision (±0.05mm) and high speed (1000mm / s) of the robotic arm to ensure that the nozzle can move accurately according to the preset trajectory, thereby achieving uniform passivation treatment of the cutting edge of the ceramic tool. By adjusting the step distance (30-45mm) between the nozzle and the sandblasting platform and the inclination angle (40°-50°) of the nozzle, the impact force and coverage of the abrasive can be effectively controlled to avoid unnecessary damage to the tool surface. The experimental results show that the surface roughness of the ceramic tool treated by the system is not only reduced to 0.07, but also the edge radius is increased to 10-20μm, which greatly reduces the possibility of chipping during cutting and enhances the stability and durability of the tool. In addition, the use of elastic abrasives further optimizes the passivation effect, making the tool more stable during cutting and the cutting force more stable, thereby greatly improving the overall performance of the ceramic tool.

[0027] 2. The passivation treatment system and method provided by the present invention enable ceramic tools to exhibit longer service life and higher cutting efficiency when cutting Inconel 718 alloy. The ceramic tools after passivation treatment have more stable cutting force and better thermal stability, can effectively reduce tool wear, improve the quality of the machined surface, and significantly reduce vibration and noise during the cutting process.

[0028] 3. The passivated ceramic tool of the present invention is not only suitable for processing general materials, but also particularly suitable for high-efficiency and high-quality cutting of difficult-to-process materials such as Inconel 718. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 This is a physical diagram of the passivation treatment system of the present invention; in the figure, 1 is a sandblasting machine; 11 is a mechanical arm; 12 is a sandblasting tube; 13 is a nozzle; 2 is a sandblasting platform; 21 is a tool clamping structure; 3 is a control panel;

[0031] Figure 2 This is a graph showing the change in cutting edge radius of the ceramic tool to be treated according to the present invention after passivation treatment at different sandblasting pressures and sandblasting time;

[0032] Figure 3This is a graph showing the variation of the surface roughness of the ceramic tool to be processed according to the present invention after passivation treatment at different sandblasting pressures as a function of the sandblasting time;

[0033] Figure 4 This is a graph showing the variation of residual stress of the ceramic tool to be processed according to the present invention after passivation treatment under the same sandblasting pressure as the sandblasting time;

[0034] Figure 5 This is a graph showing the variation of average wear amount versus cutting time when the ceramic tool to be processed in the present invention is subjected to a cutting experiment at different edge radii. DETAILED DESCRIPTION

[0035] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Ceramic tools are widely used in various cutting processes due to their high hardness, high temperature resistance and chemical stability, especially in high-speed cutting and the processing of difficult-to-cut materials (such as Inconel 718 alloy). However, the brittleness of ceramic materials is one of their main disadvantages. This brittleness makes ceramic tools prone to cracks or breaks during use, especially when subjected to impact loads or thermal stresses. In addition, the high hardness of ceramic materials also means that they require higher cutting forces during processing, which further aggravates tool wear and damage. Therefore, it is particularly important to perform necessary treatment on ceramic tools to improve their service life and surface integrity.

[0037] At present, there are two main treatment options for improving the performance of ceramic tools: cryogenic pretreatment and treatment during the machining process (i.e., cutting). Cryogenic pretreatment can enhance the wear resistance of whiskers, but it mainly modifies the material internally and cannot directly improve the geometry and surface quality of the cutting edge. Therefore, cryogenic treatment has limited effect in improving cutting edge stability. Treatment during the machining process is to increase the life of the tool by adding cutting fluid and minimal lubrication (MQL). Although this method can improve the performance of the tool to a certain extent, it still has some significant limitations. First, cutting fluid and MQL may not completely solve the cooling problem of ceramic tools under high load or high temperature conditions. The high hardness and brittleness of ceramic materials cause them to generate a lot of heat during high-speed cutting, and traditional cooling methods may not be enough to effectively dissipate heat, resulting in overheating and increased wear of the tool. Second, the use of cutting fluid will bring about environmental pollution problems, the cost of waste fluid treatment is high, and it may have adverse effects on the health of operators. In addition, the maintenance and operation costs of cutting fluid and MQL systems are also relatively high, especially in long-term use.

[0038] In view of the fact that the existing technologies are not as good as the inventor's expectations, the inventor made the present invention through further research.

[0039] The present invention can achieve uniform passivation treatment of the cutting edge of ceramic tools by accurately controlling various parameters in the sandblasting process (such as the position, angle, step distance and sandblasting pressure of the nozzle). This not only increases the radius of the cutting edge and reduces stress concentration, but also improves the wear resistance of the cutting edge, thereby significantly extending the service life of the tool. In addition, the passivated ceramic tools of the present invention show more stable cutting forces during the cutting process, reduce vibration and noise, and improve the stability and reliability of the processing process. This is particularly important for high-precision processing, especially for difficult-to-process materials such as Inconel 718 alloy.

[0040] Example 1

[0041] This embodiment provides a passivation treatment system for ceramic cutting tools, such as Figure 1As shown, it includes an air compressor and a passivation treatment chamber connected by an air pipe, and a sandblasting machine 1 and a sandblasting platform 2 are arranged in the cavity of the passivation treatment chamber; the sandblasting machine 1 includes a mechanical arm 11, a sandblasting tube 12 and a nozzle 13, wherein the mechanical arm 11 is used to control the position and angle of the nozzle 13, ensuring that the nozzle 13 can move according to a preset trajectory, so as to realize the passivation treatment of the ceramic tool to be processed placed on the sandblasting platform 2; the sandblasting tube 12 is connected to the mechanical arm 11 through the nozzle 13, and the abrasive is transported to the nozzle 13 through a pipeline; the nozzle 13 is installed at one end of the sandblasting tube 12 close to the sandblasting platform 2, and the nozzle 13 is set at an inclination angle of 40° to 50° relative to the horizontal plane where the sandblasting platform 2 is located, and the step distance between the nozzle 13 and the sandblasting platform 2 is maintained at 30 to 45 mm; a control panel 3 is arranged outside the passivation treatment chamber, and the control panel 3 is used to control the operation of the system and adjust the passivation parameters;

[0042] A tool clamping mechanism 21 is installed on the sandblasting platform 2. The tool clamping mechanism 21 is located below the sandblasting machine 1 and is used to fix the ceramic tool to be processed.

[0043] In any embodiment, the preset trajectory of the robot arm 11 includes: adjusting the running trajectory, running speed and deflection direction of the nozzle of the robot arm based on the function of the control panel.

[0044] In the present invention, the running trajectory, running speed and deflection direction of the nozzle of the robot arm 11 are adjusted by the control panel 3, which not only improves the accuracy and efficiency of the passivation treatment, but also optimizes the treatment effect, reduces human errors, and enhances the adaptability and flexibility of the system.

[0045] In any embodiment, the positioning accuracy of the robotic arm 11 is ±0.05 mm, and the maximum movement speed is 1000 mm / s.

[0046] In the present invention, high-precision positioning (±0.05mm) can ensure that the nozzle 13 is accurately aligned with the key parts of the tool during movement, avoiding uneven treatment or local excessive wear caused by position deviation. At the same time, the high speed (1000mm / s) enables the robot arm 11 to complete a complex motion path in a short time, improving the efficiency of the entire passivation process. This design not only ensures the consistency and reliability of the passivation treatment, but also significantly improves production efficiency and reduces processing time. Ultimately, through this high-precision and high-speed control, the surface quality and service life of ceramic tools can be effectively improved, and the risk of chipping during cutting can be reduced, thereby greatly improving the overall performance and processing stability of the tool.

[0047] In any embodiment, the movement trajectory of the robot arm 11 is: the movement direction is parallel to the cutting edge of the ceramic tool to be processed, and the movement distance is greater than the length of the cutting edge.

[0048] In the present invention, this kind of motion trajectory not only ensures the comprehensive passivation of the cutting edge, but also significantly improves the service life and surface integrity of the ceramic tool, thereby improving the overall processing performance.

[0049] In any embodiment, the air compressor is used to provide compressed air or inert gas with a pressure of 200 to 400 KPa.

[0050] In the present invention, the pressure range of 200-400 KPa can provide sufficient power to enable the abrasive to be evenly sprayed onto the tool surface, remove tiny surface defects and sharp edges, and avoid excessive damage to the tool. It can not only effectively improve the effect of passivation treatment, but also bring significant beneficial effects in controlling abrasive impact force, improving surface quality, reducing thermal impact and reducing environmental pollution.

[0051] Example 2

[0052] This embodiment provides a method for performing passivation treatment on a ceramic tool based on the passivation treatment system of the above embodiment, comprising the following steps:

[0053] Preparation of elastic abrasive: The preparation of the elastic abrasive in this embodiment is carried out with reference to the relevant records in the article A new elastic abrasive jetmachining method for post-treatment of tool coatings: A case study on TiAlNcoated tools for titanium machining. The raw materials of the elastic abrasive include polyurethane, silicone rubber, silicon carbide, coupling agent, curing agent, fiber and diamond powder. The specific preparation method is as follows: polyurethane, silicone rubber, silicon carbide and coupling agent are fully stirred and mixed, and then a curing agent is added to form a viscose mixture; the generated viscose mixture is placed in a high-temperature container, boiled by the air flow in the container, and then the fiber is added, and fully stirred therein to make it completely mixed, and finally the viscose mixture is poured into a pressurized chamber, baked, cured, and centrifugally crushed to make it a spherical semi-finished product, and then the diamond powder is riveted to the semi-finished product to form a final elastic abrasive;

[0054] The ceramic blade of this embodiment is a metal ceramic blade TNGG160402R-S-LT1000 purchased from the Sino-German joint venture Feipu Rui Company, and is uncoated. The blade is passivated, specifically including:

[0055] Step 1: fix the ceramic blade to be processed in the tool clamping mechanism 21 on the sandblasting platform 2;

[0056] Step 2: Set the passivation parameters through the control panel 3, and adjust the step distance between the nozzle 13 and the sandblasting platform 2 and the inclination angle of the nozzle 13; specifically, the sandblasting pressure is 200, 300 and 400 KPa, the sandblasting time is 30, 60, 90 and 120 s, the step length between the nozzle 13 and the sandblasting platform 2 is 40 mm, and the nozzle 13 is set at a 45° inclination angle relative to the horizontal plane where the sandblasting platform 2 is located;

[0057] Step 3: adjusting the position of the nozzle (13) by means of the robot arm (11) so that the center line of the nozzle 13 is aligned with the tip of the ceramic tool to be processed;

[0058] Steps 4 and 5: Start the system and make the robot arm 11 move the nozzle 13 according to the preset trajectory. Under the action of the air compressor, the elastic abrasive is accelerated to the nozzle 13 along with the high-pressure gas through the sandblasting tube 12, and hits the cutting edge of the tool tip to increase the radius of the cutting edge. After being ejected, the elastic abrasive falls directly into the recovery box for recycling. The timer is used for timing. When the sandblasting time ends, the passivation is completed.

[0059] Step 6: After the passivation treatment is completed, the system is turned off to obtain the treated ceramic tool.

[0060] Comparative Example 1

[0061] The difference from Example 2 is that a wet abrasive is used to passivate the ceramic cutting tool of the same type. Specifically, the following steps are included:

[0062] Preparation of wet abrasive: The raw materials of the wet abrasive include water and white corundum abrasive, and the specific preparation method is as follows: under stirring conditions, water and white corundum abrasive are mixed to obtain wet abrasive containing 10% of white corundum by mass;

[0063] The ceramic blade of this comparative example is a ceramic blade of the same model and is not coated. The blade is passivated, specifically including:

[0064] The wet abrasive is accelerated by a high-pressure pump and ejected from the nozzle through a pipe, hitting the cutting edge of the blade at high speed. The abrasive continuously rubs the sharp edge to achieve a passivation effect with almost no damage. The abrasive particles accompanying the fluid return to the abrasive box after the collision and continue a new cycle. The jet pressure is 200, 300, and 400 KPa, the jet duration is 10, 20, and 30 seconds, the step length between the nozzle and the operating platform is 40 mm, the nozzle and the horizontal plane where the operating platform are located are set at an angle of 45°, and the center line of the nozzle is aligned with the tip of the blade.

[0065] The profile measurement module of Alicona Infinite Focus G5 (Bruker, Germany) was used to measure the surface roughness Sa and the cutting edge radius of the front cutting edge of Example 2 and Comparative Example 1. The optimal blade was selected by measuring the cutting edge radius and surface roughness, and the surface morphology of the selected blade was analyzed by scanning electron microscopy. The effect of surface roughness on its chips was observed, the size of the cutting edge radius was observed, and the wear of the tool was evaluated; then, the surface residual stress in the same area was measured using X-ray diffraction (XRD) technology (Proto Lxrd, Canada). The current measurement uses the sin2φ method, and the residual stress value is determined by using the distance between the crystal planes as a strain gauge. Among them, the diffraction voltage is 20kv, and the target material is copper (Cu). The analysis starts and ends at angles of 131° and 142°, respectively. The test results are as follows Figures 2 to 4 shown.

[0066] The influence of pressure and time parameters on the cutting edge radius is analyzed. Figure 2 It can be seen that: the edge radius of both passivation methods increases rapidly with the increase of pressure. It can be observed that the effect of both sandblasting methods is extremely obvious when the pressure increases from 200kPa to 300kPa. When the pressure increases again, the passivation effect weakens. This is mainly because the initial tool edge radius is small. As the edge radius increases, the area of ​​the tool edge impacted by the abrasive also increases, which gradually eases the passivation effect on the edge. Therefore, the effect of increasing the edge radius will weaken.

[0067] Depend on Figure 3 It can be seen that as the pressure and time parameters change, the surface roughness of the tool also changes. Figure 3 (a) It can be observed that the wet abrasive passivation treatment on the front cutting edge of the tool first reduces the surface roughness of the tool, and then increases again after 20s. It can be seen that the surface roughness can be reduced by about 35% at most. Figure 3 (b) It can be observed that the surface roughness of the blade treated with elastic abrasive passivation is significantly reduced. This is because the elastic abrasive tends to press the particles into the surface and smear the gaps, resulting in a reduction in surface roughness. When the blade is not treated, the average surface roughness of the tool is 0.12. It can be observed that the surface roughness decreases at 30s, and the roughness decreases to a limit value of about 0.07 at around 120s.

[0068] like Figure 4As shown in the figure, under the condition of constant injection pressure, the residual stress on the tool surface increases with the increase of injection time, whether it is wet abrasive passivation treatment or elastic abrasive passivation treatment; and white corundum powder is the main abrasive in wet abrasive passivation treatment. Compared with elastic abrasive, it generates greater kinetic energy when impacted due to its high hardness and low elasticity. Under the same pressure, the residual stress on the tool surface of wet abrasive passivation treatment after continuous impact for 50s is as high as -907.6MPa ( Figure 4 a), while the residual stress of the elastic abrasive passivation treatment after 150s of continuous treatment is only -660.4KPa ( Figure 4 b), the results show that the residual stress on the tool surface is not only related to the treatment time, but also closely related to the choice of abrasive during the passivation process.

[0069] It can be seen that choosing the right pressure, time and abrasive type is the key factor to optimize the passivation effect of ceramic tools. In comparison, the passivation effect of elastic abrasive is more gentle.

[0070] Cutting experiments were conducted using the passivated ceramic blades of the above-mentioned comparative example 1 and embodiment 2. The processing material of the cutting experiment was Inconel 718 alloy with a diameter of 100 mm and a length of 400 mm. The cutting experiment was carried out on a CAK5085nzj CNC lathe of Shenyang Machine Tool Co., Ltd. to study the wear performance, chipping and cutting force changes of the metal ceramic blades after wet abrasive passivation treatment and elastic abrasive passivation treatment. The blade is the best blade selected after passivation, and the shank is the MTJNR2525M16 positive shank of Feipre Company. This experiment mainly uses dry cutting to avoid the influence of the addition of cutting fluid on the blade edge. The processing parameters set in the cutting experiment are: cutting speed vc=180m / min, feed speed f=0.3mm / r, and cutting depth ap=5mm. The maximum cutting time for each test is set to 15 minutes, and the wear changes of the tool are observed. The test results are as follows Figure 5 shown.

[0071] Depend on Figure 5 It can be seen that the life of the blade after passivation is both increased and decreased. When the edge passivation radius is in the range of 10 to 20 μm, the life is increased, and the maximum increase can be 30%. The experimental results show that appropriate passivation treatment can enhance the cutting performance of the tool, but excessive passivation will have a negative impact on the tool, causing accelerated wear and even chipping.

[0072] In summary, the ceramic blades treated with elastic abrasive passivation show longer service life and higher cutting efficiency when cutting Inconel 718 alloy. The ceramic tools after passivation treatment have more stable cutting force and better thermal stability, which can effectively reduce tool wear and significantly improve the machining quality of the alloy.

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

Claims

1. A passivation treatment system for ceramic cutting tools, comprising an air compressor and a passivation treatment chamber connected by an air pipe, characterized in that: A sandblasting machine (1) and a sandblasting platform (2) are arranged in the cavity of the passivation treatment chamber; the sandblasting machine (1) comprises a mechanical arm (11), a sandblasting tube (12) and a nozzle (13), wherein the mechanical arm (11) is used to control the position and angle of the nozzle (13) to ensure that the nozzle (13) can move according to a preset trajectory to perform passivation treatment on the ceramic tool to be treated placed on the sandblasting platform (2); the sandblasting tube (12) is connected to the mechanical arm (11) through the nozzle (13), and The abrasive is transported to the nozzle (13) through a pipeline; the nozzle (13) is installed at one end of the sandblasting tube (12) close to the sandblasting platform (2), the nozzle (13) is arranged at an inclination angle of 40° to 50° relative to the horizontal plane where the sandblasting platform (2) is located, and a step distance of 30 to 45 mm is maintained between the nozzle (13) and the sandblasting platform (2); a control panel (3) is arranged outside the passivation treatment chamber, and the control panel (3) is used to control the operation of the system and adjust the passivation parameters; A tool clamping mechanism (21) is installed on the sandblasting platform (2); the tool clamping mechanism (21) is located below the sandblasting machine (1) and is used to fix the ceramic tool to be processed.

2. The passivation treatment system according to claim 1, characterized in that: The preset trajectory of the mechanical arm (11) includes: adjusting the running trajectory, running speed and deflection direction of the nozzle (13) of the mechanical arm (11) based on the function of the control panel (3).

3. The passivation treatment system according to claim 2, characterized in that: The positioning accuracy of the mechanical arm (11) is ±0.05 mm, and the maximum movement speed is 1000 mm / s; The movement trajectory of the mechanical arm (11) is as follows: the movement direction is parallel to the cutting edge of the ceramic tool to be processed, and the movement distance is greater than the length of the cutting edge.

4. The passivation treatment system according to claim 1, characterized in that: The air compressor is used to provide compressed air or inert gas with a pressure of 200-400KPa.

5. A passivation method based on the passivation treatment system according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: Step 1: Fix the ceramic tool to be processed in a tool clamping mechanism (21) on the sandblasting platform (2); Step 2: setting the passivation parameters through the control panel (3), and adjusting the step distance between the nozzle (13) and the sandblasting platform (2) and the inclination angle of the nozzle (13); Step 3: adjusting the position of the nozzle (13) by means of the mechanical arm (11); Step 4: Start the system, and under the action of the air compressor, the abrasive is transported to the nozzle (13) through the sandblasting pipe (12); Step 5: The robot arm (11) moves the nozzle (13) according to a preset trajectory to passivate the ceramic tool to be processed; Step 6: After the passivation treatment is completed, the system is turned off to obtain the treated ceramic tool.

6. The passivation method according to claim 5, characterized in that: In step 2, the passivation parameters include: sandblasting pressure of 200 to 400 KPa, and sandblasting duration of 30 to 120 s.

7. The passivation treatment system according to claim 5, characterized in that: In step three, the position requirement is that the center line of the nozzle (13) is aligned with the tip of the ceramic tool to be processed.

8. The passivation method according to claim 5, characterized in that: In step 4, the abrasive is an elastic abrasive.

9. The passivation method according to claim 5, characterized in that: In step six, the surface roughness of the treated ceramic tool is reduced to 0.07, and the cutting edge radius is 10-20 μm.

10. A ceramic tool treated by the passivation method according to any one of claims 5 to 9, characterized in that: The ceramic tool is used for machining Inconel 718 alloy.

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