Hyperelastic composite abrasive material for jet polishing and preparation method and device of superelastic composite abrasive material

Abstract

The invention belongs to the technical field of superhard material products, and particularly relates to a superelastic composite abrasive for jet polishing and a preparation method and device thereof. The invention firstly provides a hyperelastic composite abrasive material for jet polishing. The hyperelastic composite abrasive material is prepared from the following raw materials in parts by weight: 80-120 parts of a viscoelastic raw material, 5-15 parts of a superhard abrasive material, 5-15 parts of a common abrasive material and 2-8 parts of metal powder. By the adoption of the preparation method and device, the hard abrasive can be firmly combined to the surface of the elastic core, so that the service life of the elastic abrasive is prolonged, and the machining stability and the polishing surface quality are improved. According to the method, the heating treatment mode of the diamond abrasive and the metal powder and the rubbing and extruding mode of the elastic abrasive rolling system on the elastic abrasive are improved, the preparation technology that the diamond and the metal powder are firmly embedded and adhered to the surface of the elastic core is formed, the performance of the hyperelastic composite abrasive is improved, and the service life of the hyperelastic composite abrasive is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of superhard material products technology, specifically relating to a superelastic composite abrasive for jet polishing and its preparation method and apparatus. Background Technology

[0002] Components with complex surface contours are a type of critical basic component. With the rapid development of industries such as defense, electronics, automotive, and aerospace, the demand for complex or irregularly shaped surface parts is gradually increasing. These components with complex surface contours not only require high dimensional and positional accuracy but also place extremely high demands on surface quality. The surface quality of these components mainly depends on ultra-precision polishing technology. Currently, some complex surface contour parts in engineering rely on manual polishing by workers, which makes it difficult to guarantee the stability and efficiency of polishing quality and heavily depends on the experience and condition of the workers. Furthermore, traditional polishing is limited by the fit between the tool and the complex surface contour being polished, often resulting in unpolished areas, and the post-polishing quality often fails to meet design standards.

[0003] Abrasive jet polishing is a machining process that uses air or other media to propel abrasive particles at high speed onto the surface of a workpiece. The high-speed collision and shearing action of the abrasive particles achieves grinding and removes some of the material. Air jet polishing, powered by compressed air, has good compressibility and fluidity, thus effectively improving the adhesion between the polishing flow field and the polished surface, and effectively reducing unpolished areas. Therefore, air jet polishing technology has wide applications in the surface polishing of parts with complex contours.

[0004] To improve the performance of air jet polishing in high-quality, high-precision machining of complex surface contours and difficult-to-machine material parts, a series of studies and explorations have been conducted in China on abrasive materials for air jet polishing. Some domestic research institutions and enterprises have developed some elastic abrasives for air jet polishing. For example, Chinese patent CN105175043A discloses a method and product for preparing a high-hardness viscoelastic abrasive, using polystyrene plastic, silicone rubber, silicone oil, and abrasive, which is prepared by mechanically stirring and mixing. However, due to the weak adhesion between the abrasive and polystyrene material, the prepared abrasive has low strength and is prone to shedding and breakage during use. Chinese patent CN107674294A discloses a thermoplastic elastic abrasive for polishing and its manufacturing method. The abrasive, styrene-butadiene-styrene thermoplastic elastomer, modifier, and filler are dispersed, mixed, granulated, injection molded, and then re-granulated to produce thermoplastic abrasive particles that can form round, rhomboid, and cubic shapes. During polishing, it does not cause pits, scratches, or cracks on the workpiece, and the abrasive is easy to clean. However, its polishing ability is poor, and the surface finish can only reach about Ra0.15, which is insufficient for processing workpieces with high surface quality requirements. Chinese patent CN101892014A discloses an elastomeric abrasive composed of rigid abrasive and elastic foam. The elastic foam coats the surface of the rigid abrasive, reducing noise and dust pollution during use and improving the surface cleanliness of the workpiece. This elastic abrasive is used in metal rust removal and concrete surface treatment, and is classified as roughing. Chinese patent CN115820209B discloses a soft elastic abrasive for use in tool polishing and passivation and its preparation method. The soft elastic abrasive is a 30”-like structure in which hard abrasive is uniformly embedded on the surface of a soft carrier. The abrasive particles are adhered to the elastic core by means of heating the elastic core and rotating and stirring. However, when this elastic abrasive is used for tool passivation and polishing, it exhibits insufficient bonding force between the abrasive particles and the elastic core, causing the abrasive particles to fall off the elastic core prematurely, thus resulting in the failure of the polishing performance of the elastic abrasive.

[0005] Therefore, it is necessary to develop an elastic composite abrasive for air jet polishing that can firmly bond abrasive particles to the core surface, improve the service life of the elastic abrasive, and enhance the surface quality of the jet polishing effect. Summary of the Invention

[0006] The purpose of this invention is to provide a superelastic composite abrasive for jet polishing, as well as its preparation method and apparatus. The preparation method and apparatus of this invention can firmly bond hard abrasive to the surface of an elastic core, thereby improving the service life, processing stability and polishing surface quality of the elastic abrasive.

[0007] This invention improves the heating treatment method of diamond abrasive and metal powder, as well as the kneading and extrusion method of elastic abrasive by the elastic abrasive roller pressing system, to form a preparation process in which diamond and metal powder are firmly embedded and adhered to the surface of the elastic core, which is beneficial to improving the performance and service life of the superelastic composite abrasive.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: The present invention first provides a superelastic composite abrasive for jet polishing, which is prepared from the following raw materials in parts by weight: 80-120 parts of viscoelastic raw material, 5-15 parts of superhard abrasive, 5-15 parts of ordinary abrasive, and 2-8 parts of metal powder.

[0009] Specifically, viscoelastic raw materials can be selected from thermoplastic rubbers, elastomers, and their physical or chemically modified materials, such as one or more of thermoplastic styrene-butadiene rubber (SBS, SEBS), thermoplastic polyurethane rubber (TPU), and styrene-based thermoplastic elastomers (TPES), with a Shore hardness of 45-70 HA and a density range of 0.6-1.3 g / cm³. 3 Preferably, the viscoelastic raw material is WHT-1565 polyurethane elastomer from Wanhua Chemical Group Co., Ltd., or E45A polyurethane elastomer from BASF.

[0010] Specifically, the superhard abrasive is selected from one or two of diamond, cubic boron nitride, etc.; the ordinary abrasive is selected from one or more of cerium oxide (CeO2), silicon carbide (SiC), boron carbide (B4C), white corundum (WA), iron oxide (Fe2O3), etc. Specifically, the ordinary abrasive is a micron-grade raw material.

[0011] Specifically, the metal powder can be magnetic iron powder or nickel powder, or non-magnetic copper powder, tungsten powder, cobalt powder, tungsten carbide powder, etc.; non-magnetic metal powder is preferred. The metal powder can be used alone or mixed as needed.

[0012] Furthermore, the present invention provides a method for preparing a superelastic composite abrasive for jet polishing, comprising the following steps: 1) Crush and granulate the viscoelastic raw materials, and obtain elastic core particles (H) with the target particle size range and / or target morphology by mechanical screening; 2) Weigh a certain amount of metal powder (Me) and place it in a mixing tank. Place the mixing tank containing the metal powder (Me) in an electric heating oven. Set the oven temperature to 10-15℃ above the initial melting temperature of the elastic core material (specifically 130~135℃) and keep it at that temperature for 30-60 minutes to ensure that the metal powder (Me) and the ball milling tank are fully and uniformly heated. 3) Take a certain amount of the elastic core particles (H) from step 1) and place them in the mixing tank from step 2). Then place the mixing tank in a ball mill for ball milling. During mixing, ball milling media (such as steel balls, ceramic balls, etc.) can be added as needed to improve mixing efficiency. When the elastic core particles (H) are placed in the heated mixing tank, the higher temperature softens and melts the surface of the elastic core. At the same time, the metal powder (Me) heated by the high temperature will coat the surface of the elastic core particles (H) during the ball milling process, further promoting the melting of the surface of the elastic core particles (H). During the ball milling process, different particles collide and rub against each other with the media balls, thereby causing the metal powder (Me) to adhere to and embed on the surface of the elastic core particles (H). When the surface temperature of the mixing tank drops to 10-20°C (specifically 110-120°C) below the initial melting temperature of the elastic core material, the mixing tank is removed from the mill to obtain mixture I. Mixture I is then sieved to obtain the first stage of elastic abrasive particles (E0). 4) Weigh out a certain amount of superhard abrasive and a certain amount of ordinary abrasive, mix the superhard abrasive and ordinary abrasive and then sieve to obtain a uniformly dispersed multi-component abrasive (M). 5) Place the multi-component abrasive (M) from step 4) into a mixing tank, and place the mixing tank containing the multi-component abrasive (M) into an electric heating oven. Set the oven temperature to 10-15°C above the initial melting temperature of the elastic core material (specifically 130-135°C) and keep it at that temperature for 30-60 minutes to ensure that the multi-component abrasive (M) and the grinding tank are fully and uniformly heated. 6) Place the elastic abrasive particles (E0) from step 3) into the mixing tank from step 5), and then place the mixing tank into a ball mill for ball milling. During mixing, grinding media (such as steel balls, ceramic balls, etc.) can be added as needed to improve mixing efficiency. When the elastic abrasive particles (E0) are placed in the heated mixing tank, the high temperature softens and melts the surface of the elastic abrasive particles (E0). At the same time, the multi-component abrasive (M) heated at high temperature will coat the surface of the elastic abrasive particles (E0) during the ball milling process, further promoting the melting of the surface of the elastic abrasive particles (E0). During the ball milling process, different particles collide and rub against each other with the grinding media balls, thereby causing the multi-component abrasive (M) to adhere to and embed on the surface of the elastic abrasive particles (E0). When the surface temperature of the mixing tank drops to 10-20°C below the initial melting temperature of the elastic core material, the mixing tank is removed from the mill to obtain mixture II. Mixture II is then sieved to obtain the elastic abrasive particles of stage II (E1). 7) Place the elastic abrasive particles (E1) from stage II in an electric heating oven, set the oven temperature to 110~140℃, and heat for 30-60 minutes. Then place the elastic abrasive particles (E1) in an elastic abrasive rolling system (D) for rolling. After rolling by the elastic abrasive rolling system (D), the bonding and interlocking strength of the metal powder (Me), multi-component abrasive (M) and elastic core particles (H) is further improved, and the finished product of superelastic composite abrasive (E) is obtained.

[0013] Specifically, in step 1), the viscoelastic raw material can be selected from thermoplastic rubber, elastomer materials, and their physical or chemical modified materials, such as one or more of thermoplastic styrene-butadiene rubber (SBS, SEBS), thermoplastic polyurethane rubber (TPU), and styrene-based thermoplastic elastomers (TPES), with a Shore hardness of 45-70 HA and a density range of 0.6-1.3 g / cm³. 3 .

[0014] Specifically, in step 1), the target particle size range of the elastic core particles is preferably 0.1-0.2 mm, 0.2-0.4 mm, or 0.4-0.8 mm, or 140-80 mesh, 70-40 mesh, or 35-20 mesh. Different particle size ranges can also be selected according to actual needs. The target particle shape is a near-elliptical or irregular multifaceted particle.

[0015] Specifically, in step 2), the metal powder can be magnetic iron powder or nickel powder, or non-magnetic copper powder, tungsten powder, cobalt powder, tungsten carbide powder, etc.; non-magnetic metal powder is preferred. The metal powder can be used alone or mixed as needed.

[0016] In a further preferred embodiment, in step 2), the metal powder can be placed in a mixing tank and then placed in an oven for heating treatment, or it can be placed separately on a tray and then placed in an oven for heating treatment.

[0017] Specifically, in step 3), the mass ratio of the elastic core particles (H) to the metal powder (Me) ranges from 100:1 to 100:10.

[0018] More preferably, in step 3), when the elastic core particles (H) from step 1) are placed in the mixing tank from step 2), the amount (volume) of the added elastic core particles (H) is 1 / 2 to 2 / 3 of the volume of the mixing tank.

[0019] Specifically, in step 3), the mill speed is used in the low-to-medium speed range to increase the friction and collision between the ball milling media, the elastic core particles (H), and the metal powder (Me), thereby accelerating the interlocking between the metal powder (Me) and the elastic core particles (H).

[0020] Specifically, in step 4), the multi-component abrasive (M) is composed of superhard abrasive and ordinary abrasive, with the content of the two being 50-100% by mass percentage, and the content of the ordinary abrasive being 0-60%; the superhard abrasive is selected from one or two of diamond, cubic boron nitride, etc.; the ordinary abrasive is selected from one or more of cerium oxide (CeO2), silicon carbide (SiC), boron carbide (B4C), white corundum (WA), iron oxide (Fe2O3), etc.

[0021] Specifically, in step 4), the particle size range of the multi-component abrasive (M) is 1000#-15000#.

[0022] More preferably, in step 5), when the multi-component abrasive (M) from step 4) is placed into the mixing tank, the amount (volume) of the multi-component abrasive (M) added accounts for 1 / 4 to 1 / 3 of the volume of the mixing tank.

[0023] In a further preferred embodiment, in step 5), the multi-component abrasive (M) can be placed in a mixing tank and then placed in an oven for heat treatment, or it can be placed separately on a tray and then placed in an oven for heat treatment.

[0024] Specifically, in step 6), the mass ratio of elastic abrasive particles (E0) to multi-component abrasive (M) ranges from 100:10 to 100:30.

[0025] Specifically, in step 6), when the elastic abrasive particles (E0) from step 3) are placed into the mixing tank from step 5), the amount (volume) of the elastic abrasive particles (E0) added is 1 / 2 to 2 / 3 of the volume of the mixing tank.

[0026] Specifically, in step 6), the mill speed is used in the low-to-medium speed range to increase the friction and collision between the ball milling media, elastic core particles (H), multi-component abrasive (M), and elastic abrasive particles (E0), thereby accelerating the interlocking between the multi-component abrasive (M) and the elastic core particles (H) and elastic abrasive particles (E0).

[0027] Specifically, in step 6), infrared temperature measurement can be used to detect the temperature of the mixing tank in real time. When the temperature is lower than the set value, the mixing tank can be removed.

[0028] Specifically, in step 6), when sieving, the screen size used should be at least one size smaller than the elastic core particles (H) and at least one size coarser than the multi-component abrasive (M) to speed up the sieving process and remove smaller core particles that were not completely separated in step 1).

[0029] Specifically, in steps 2), 3), 5), and 6), the mixing tank is preferably made of ceramic material with good heat insulation properties, but stainless steel or high-temperature resistant plastic material can also be selected.

[0030] Specifically, in step 7), the rolling time can be adjusted appropriately according to the weight of the elastic abrasive particles (E1). Preferably, the rolling time for 1 kg of elastic abrasive particles (E1) is about 10-15 minutes.

[0031] Furthermore, in step 7), the elastic abrasive roller pressing system (D) includes a feeding device, an extrusion roller device, and a return device; The feeding device includes a vibrating feeder, a guide plate, a material collection controller, and a material lifting conveyor belt. The vibrating feeder is located above the material collection controller, with the top of the vibrating feeder being the inlet and the bottom being the outlet. The top of the material collection controller is also the inlet, and the bottom is the outlet. The outlet of the vibrating feeder corresponds to the inlet of the material collection controller. The guide plate is located between the outlet of the vibrating feeder and the inlet of the material collection controller. The material collection controller adopts a wedge structure with an adjustable wedge angle. During use, the size of the elastic abrasive particles (E0) and elastic abrasive particles (E1), the feeding speed, etc. are adjusted to adjust the size of the material collection controller's outlet, thereby controlling the amount of material entering the extrusion roller device and preventing the elastic abrasive particles (E1) from accumulating in the extrusion roller device. During operation, the raw material is put into the vibrating feeder and enters the material collection controller through the guide plate.

[0032] Furthermore, the extrusion roller assembly includes a frame body, two rollers arranged side by side, a drive mechanism, and a heating and temperature control mechanism; the two rollers are arranged side by side on the upper surface of the frame body; The upper surface of the frame body is also equipped with two roller spacing adjustment mechanisms, which can adjust the distance between the two rollers. The drive mechanism can drive the two rollers to rotate in the same or opposite directions. The heating and temperature control mechanism can heat the two rollers, monitor the side walls or surfaces of the two rollers, and regulate the temperature of the two rollers.

[0033] Furthermore, the discharge end of the material collector controller transports the material to a high position via a material lifting conveyor belt, and causes the material to fall from above the extrusion roller device onto the surface of the two rollers.

[0034] Furthermore, the return material device includes a return hopper and a return material lifting conveyor belt. The return hopper is located below the extrusion roller device. The return hopper can return the material to the vibrating feeder via the return material lifting conveyor belt. After passing through the extrusion roller device, the elastic abrasive particles are conveyed to the vibrating feeder through the return device, thereby achieving secondary processing, and the extrusion is repeated in this way. During operation, the roller temperature is set 5-10°C higher than the melting temperature of the elastic core material. The elastic abrasive particles (E0) and (E1) are compressed and deformed between the rollers at higher temperatures and then rebound. Because the roller temperature is higher than its own initial melting temperature, some melting occurs on the surface of the elastic abrasive particles (E0) and (E1), which further increases the degree to which the multi-component abrasive (M) is embedded in the elastic core particle (H) and increases the bonding strength of the multi-component abrasive (M) on the surface of the elastic core particle (H). After multiple cycles of extrusion, the superelastic composite abrasive product is obtained.

[0035] Furthermore, a first bracket and a second bracket are provided on the rear side of the upper surface of the frame body. The first bracket is located at the left end of the rear side of the upper surface of the frame body, and the second bracket is located at the right end of the rear side of the upper surface of the frame body. Both the first bracket and the second bracket are fixedly connected to the upper surface of the frame body. Both the first bracket and the second bracket are provided with a first rotating hole. The left shaft end of the roller located on the rear side passes through the first rotating hole on the first bracket, and the right shaft end of the roller located on the rear side passes through the first rotating hole on the second bracket. Through the first rotating holes provided on the first bracket and the second bracket, the roller located on the rear side is rotatably connected to the first bracket and the second bracket.

[0036] Furthermore, the upper surface of the frame body is provided with two slide rails, left and right. The left slide rail is located at the left end of the front side of the upper surface of the frame body, and the right slide rail is located at the right end of the front side of the upper surface of the frame body. Both the left and right slide rails extend back and forth in the horizontal direction. The top of the left slide rail is slidably connected to a third bracket, and the top of the right slide rail is slidably connected to a fourth bracket. The third bracket can slide back and forth along the extension direction of the left slide rail, and the fourth bracket can slide back and forth along the extension direction of the right slide rail.

[0037] Furthermore, both the third and fourth supports are provided with second rotating holes. The left shaft end of the front roller passes through the second rotating hole on the third support, and the right shaft end of the front roller passes through the second rotating hole on the fourth support. Through the second rotating holes provided on the third and fourth supports, the front roller is rotatably connected to the third and fourth supports.

[0038] Furthermore, two roller spacing adjustment mechanisms are respectively set at the front end of the third and fourth supports. The roller spacing adjustment mechanism includes two telescopic motors and two telescopic rods. The left telescopic rod is connected to the third support, and the right telescopic rod is connected to the fourth support. Both telescopic motors are fixedly connected to the upper surface of the frame body. The telescopic motors drive the telescopic rods to extend and retract, thereby driving the third and fourth supports to slide back and forth along the left and right slide rails, and driving the front roller to move back and forth relative to the rear roller, thereby realizing the adjustment of the distance between the front roller and the rear roller.

[0039] Furthermore, the drive mechanism includes two drive motors, the output shafts of which are connected to the shaft ends of the two rollers respectively via flexible couplings, and the two drive motors can drive the two rollers to rotate at different speeds and in different directions.

[0040] Furthermore, the heating and temperature control mechanism includes two electric heating tubes, a roller temperature PLC controller, and two roller surface temperature infrared thermometers; Each of the two rollers is equipped with a heating tube placement cavity, and two electric heating tubes are respectively placed in the heating tube placement cavities of the two rollers; infrared thermometers for the surface temperature of the two rollers are respectively placed on the upper surface of the frame body and close to the side walls of the two rollers. The roller temperature PLC controller is electrically connected to the two electric heating tubes via a slip ring, and the two roller surface temperature infrared thermometers are electrically connected to the roller temperature PLC controller.

[0041] Specifically, the roller temperature PLC controller is equipped with a temperature signal receiving end, a central processing unit control module, and a heating control module; the roller surface temperature infrared thermometer is equipped with a temperature signal transmitting end, which can send the temperature signal to the temperature signal receiving end of the roller temperature PLC controller, and the temperature signal receiving end sends the temperature signal to the central processing unit control module; the heating control module is equipped with a heating signal transmitting end and is electrically connected to the electric heating tube. During operation, the surface temperature of the roller is detected by an infrared thermometer and the temperature signal is sent to the temperature signal receiving terminal of the roller temperature PLC controller. At the same time, the central processing unit control module of the roller temperature PLC controller sets the set temperature and compares the received temperature signal with the set temperature value of the central processing unit control module. If the temperature signal received by the central processing unit (CPU) control module is lower than the set temperature value of the CPU control module, the CPU control module sends a signal to the heating control module to start heating and sends it to the electric heating element, which then starts heating.

[0042] Specifically, the roller temperature PLC controller used in this invention can be of models such as FX1N-40MT-0001, S7-300, FX3U, or S7-1500; During operation, the surface temperature of the roller is detected by an infrared thermometer and the temperature signal is sent to the roller temperature PLC controller. The roller temperature PLC controller monitors the opening and closing of the electric heating tube. When the infrared thermometer of the roller surface temperature sends the temperature signal to the roller temperature PLC controller, if the temperature is lower than the set value, the roller temperature PLC controller will start the electric heating tube to heat the roller. If the infrared thermometer of the roller surface temperature detects that the temperature is higher than the set value, the roller temperature PLC controller will shut down the electric heating tube. During this process, the temperature detection result of the infrared thermometer of the roller surface temperature is simultaneously sent to the roller temperature PLC controller for data reference, so as to monitor the final temperature change of the slurry in real time.

[0043] Furthermore, the rollers are made of alloy steel, stainless steel and other materials, and are demagnetized. They have a diameter of 50-150mm and the surface needs to be finely ground with a surface roughness of ≤Ra0.2μm. The roller surface is coated with tungsten carbide to improve the wear resistance of the roller surface. By sliding the third and fourth supports relative to the frame body, one roller is moved relative to the other, thereby adjusting the distance between the two rollers and changing the degree of compression of the elastic abrasive particles (E1). The distance between the two rollers is usually adjusted to 50-90% of the particle size of the elastic abrasive particles (E1). During operation, it is preferable to set two rollers to rotate in opposite directions with a speed difference of 5-15%. By setting the speed difference of the rollers, on the one hand, it promotes the entry and passage of elastic abrasive (E0) or elastic abrasive particles (E1) into the roller gap and into the return device; on the other hand, the difference in linear velocity caused by the speed difference causes the elastic abrasive to be squeezed and deformed while passing through the roller gap, and it also undergoes tensile deformation, which leads to the elastic abrasive being kneaded, which is beneficial for the multi-component abrasive (M) to be embedded in the surface of the elastic core particles (H) and elastic abrasive particles (E0).

[0044] Furthermore, the method for preparing the superelastic composite abrasive for jet polishing further includes, after step 7): Repeating steps 2), 3), 4), 5), and 6) with the obtained superelastic composite abrasive product (E) allows for adjustment of the content of metal powder (Me) and multi-component abrasive (M) on the surface of the elastic core particles (H), thereby controlling the polishing performance and service life of the superelastic composite abrasive product (E).

[0045] Furthermore, the present invention also provides a superelastic composite abrasive for jet polishing prepared by the above method.

[0046] Furthermore, the superelastic composite abrasive prepared by this invention, combined with air jet processing technology, can achieve high surface quality and high surface integrity polishing of complex contour parts made of high-temperature alloys and titanium alloys.

[0047] Specifically, the superelastic composite abrasive, combined with air jet processing technology, can achieve polishing of the surface of integral bladed disks for aerospace applications. After processing, the surface finish of the integral bladed disk can reach below Ra0.4μm, realizing high-efficiency and high-surface-integrity polishing of the integral bladed disk.

[0048] Based on a general inventive concept, the present invention also provides the application of the superelastic composite abrasive for jet polishing in jet polishing of metal or alloy parts for aerospace or aviation applications.

[0049] Specifically, the application of the superelastic composite abrasive in jet polishing of integral bladed disks for aerospace applications.

[0050] Specifically, the integral bladed disk is made of high-temperature alloy or titanium alloy.

[0051] Compared with the prior art, the advantages of the present invention are: 1. The superelastic composite abrasive prepared by this invention retains the basic properties of the elastic core, which is beneficial for the core's elastic properties to function effectively and for improving the polishing effect and efficiency of the elastic abrasive. During the manufacturing process of the superelastic composite abrasive, the elastic core only undergoes physical changes such as localized surface melting, extrusion, and stretching, with almost no chemical changes, thus preserving its basic properties.

[0052] 2. The present invention uses metal powder to treat the surface of the elastic core, which can effectively increase the density of the elastic abrasive, which is beneficial to increase the impact and scratching between the elastic abrasive and the workpiece surface, thereby improving the polishing efficiency of the elastic abrasive.

[0053] 3. The elastic abrasive roller pressing system provided by the present invention can further enhance the bonding strength between hard abrasive particles and elastic core, and can effectively increase the content of hard abrasive in elastic abrasive. This can effectively reduce the decline in polishing performance caused by the shedding of hard abrasive particles during the application of elastic abrasive, and the uneven polishing effect caused by the instability of polishing performance. It is beneficial to improve the service life, polishing performance stability and polishing effect consistency of elastic abrasive.

[0054] 4. The superelastic composite abrasive prepared by this invention undergoes extrusion and stretching deformation during the roller extrusion process, which can effectively improve the surface roughness of the elastic abrasive and achieve the effect of "sharpening" the surface of the elastic abrasive, thus improving the polishing efficiency of the elastic abrasive.

[0055] 5. The preparation method of the superelastic composite abrasive for jet polishing described in this invention is convenient to operate, requires simple manufacturing equipment, and can achieve automated operation, which is beneficial to the batch preparation of elastic abrasives and the stability and consistency of the performance between batches of elastic abrasives. Attached Figure Description

[0056] Figure 1 These are macroscopic and microscopic images of the superelastic composite abrasive prepared in Example 1; Figure 2 This is a schematic diagram of the overall structure of the elastic abrasive roller pressing system; Figure 3 yes Figure 2 A top view of the extrusion roller assembly rotated 90° counterclockwise; Figure 4 This is a diagram showing the connection relationships between the roller, the roller temperature PLC controller, the roller surface temperature infrared thermometer, and the electric heating tube. Figure 5 This is a comparison chart of the performance stability of different elastic abrasives; Figure 6 These are comparison images of the superelastic composite abrasive prepared in Example 1 before and after polishing. Detailed Implementation

[0057] The technical solutions of this application will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0058] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0059] The process methods not specifically described in the following embodiments all adopt conventional technical means in the prior art.

[0060] In the following examples, room temperature or normal temperature refers to 25±5℃.

[0061] The raw materials used in this invention are of the following types: The viscoelastic raw materials are: WHT-1565 polyurethane elastomer from Wanhua Chemical Group Co., Ltd., and E45A polyurethane elastomer from BASF; the diamond is: LMF / LMF+ from Henan Liliang Diamond Co., Ltd.; the cubic boron nitride is: CBNM-B from Zhengzhou Zhongnan Jiete Superhard Materials Co., Ltd.; the common abrasives are: silicon carbide micro powder (W1.5) and white fused alumina micro powder (W1) from Baige Group Co., Ltd. The metal powders are commercially available products.

[0062] Example 1 Example 1 provides a superelastic composite abrasive for jet polishing, which is prepared from the following raw materials in weight percentage: 100 parts of WHT-1565 polyurethane elastic, 10 parts of LMF / LMF+diamond (particle size M1 / 2), 10 parts of silicon carbide micro powder (particle size W1.5), and 5 parts of metallic copper powder.

[0063] The preparation method, specifically the following steps: 1) WHT-1565 polyurethane elastomer is crushed and granulated, and then mechanically screened to obtain 35-20 mesh elastic core particles H.

[0064] 2) Weigh out 50 grams of copper powder according to the required ratio and put it into a mixing tank. Place the mixing tank containing copper powder in an electric heating oven and heat it to 10-15°C above the initial melting temperature of the elastic core material. Specifically, set the oven temperature to 130°C and keep it warm for 30 minutes to ensure that the copper powder and the ball milling tank are fully and evenly heated.

[0065] 3) Take 1000g of the elastic core particles H from step 1) and put them into the mixing tank from step 2). Then place the mixing tank in a ball mill for ball milling (the ball milling tank temperature is 130℃ at the beginning of the ball milling, and the temperature will gradually decrease as the ball milling time increases). This softens and melts the surface of the elastic core particles. At the same time, the copper powder heated at high temperature will coat the surface of the elastic core particles H during the ball milling process, further promoting the melting of the surface of the elastic core particles H. During the ball milling process, different particles collide and rub against each other with the media balls, thereby causing the copper powder to adhere to and embed on the surface of the elastic core particles H. When the surface temperature of the mixing tank drops to 10-20℃ (i.e. 110℃) below the initial melting temperature of the elastic core material, the mixing tank is removed from the mill to obtain mixture I. Mixture I is then sieved to obtain the elastic abrasive particles E0 of stage I.

[0066] 4) Weigh 100 grams of diamond and 100 grams of silicon carbide micro powder according to the required ratio. Mix the superhard abrasive (diamond) and ordinary abrasive (silicon carbide micro powder) and then sieve to obtain a uniformly dispersed multi-component abrasive M.

[0067] 5) Place the multi-component abrasive M from step 4) into a mixing tank, and place the mixing tank containing the multi-component abrasive M in an electric heating oven and heat it to 10-15°C above the initial melting temperature of the elastic core material. Specifically, set the oven temperature to 130°C and keep it at that temperature for 30 minutes to ensure that the multi-component abrasive M and the ball milling tank are heated fully and evenly.

[0068] 6) Take the elastic abrasive particles E0 from step 3) and put them into the mixing tank from step 5). Then place the mixing tank in a ball mill for ball milling (the ball milling tank temperature is 130℃ at the beginning of ball milling, and the temperature will gradually decrease as the ball milling time increases). Add 200 grams of ceramic balls during mixing to improve mixing efficiency. When the elastic abrasive particles E0 are put into the heated mixing tank, the higher temperature softens and melts the surface of the elastic abrasive particles E0. At the same time, the multi-component abrasive M heated at high temperature will coat the surface of the elastic abrasive particles E0 during the ball milling process, further promoting the melting of the surface of the elastic abrasive particles E0. During the ball milling process, different particles and media balls collide and rub against each other, thereby causing the multi-component abrasive M to adhere to and embed on the surface of the elastic abrasive particles E0. When the surface temperature of the mixing tank drops to 10-20°C (i.e. 110°C) below the initial melting temperature of the elastic core material, the mixing tank is removed from the mill to obtain mixture II. Mixture II is then sieved to obtain the elastic abrasive particles E1 of stage II.

[0069] 7) Place the elastic abrasive particles E1 from stage II in an electric heating oven and heat them to 130°C for 35 minutes. Then place the elastic abrasive particles E1 in the elastic abrasive rolling system D, adjust the distance between the two rollers to 0.6 mm, and the speed difference between the two rollers to 10% (for example, the speed of one roller can be set to 60 rpm and the speed of the other roller to 70 rpm). Circulate the rolling for 15 minutes to obtain the superelastic composite abrasive product E.

[0070] Specifically, such as Figure 2 , 3 As shown in Figure 4, the elastic abrasive roller pressing system D in step 7) of the present invention includes a feeding device, an extrusion roller device b, and a return device c; The feeding device includes a vibrating feeder a1, a guide plate (not shown in the figure), a material collection controller a3, and a material lifting conveyor belt (not shown in the figure). The vibrating feeder a1 is located above the material collection controller a3. The top of the vibrating feeder a1 is the feeding end and the bottom is the discharging end. The top of the material collection controller a3 is the feeding end and the bottom is the discharging end. The discharging end of the vibrating feeder a1 corresponds to the feeding end of the material collection controller a3. The guide plate is located between the discharging end of the vibrating feeder a1 and the feeding end of the material collection controller a3. The material collection controller a3 adopts a wedge structure with an adjustable wedge angle. During use, the wedge angle is adjusted according to the particle size of elastic abrasive particles E0 and E1, the feeding speed, etc., thereby adjusting the size of the discharge port of the material collection controller a3, and thus controlling the amount of material entering the extrusion roller device b, preventing the elastic abrasive particles E1 from accumulating in the extrusion roller device b; the vibrating feeder a1 adopts an existing conventional feeder, such as a trough vibrating feeder (GZG30-4); during operation, the raw material is put into the vibrating feeder a1 and enters the material collection controller a3 through the guide plate.

[0071] The extrusion roller device b includes a frame body, two rollers b1 arranged side by side, a drive mechanism, and a heating and temperature control mechanism; like Figure 3 As shown Figure 2 The view of the extrusion roller assembly b, taken from a top view and rotated 90° counterclockwise, shows two rollers b1 arranged side-by-side on the upper surface of the frame body. Figure 3 The main body of the middle frame extends horizontally to the left and right, and both rollers b1 extend horizontally to the left and right. Specifically, Figure 3 The upper surface of the frame body is provided with a first bracket and a second bracket. The first bracket is located at the left end of the upper surface of the frame body, and the second bracket is located at the right end of the upper surface of the frame body. Both the first bracket and the second bracket are fixedly connected to the upper surface of the frame body. Both the first bracket and the second bracket are provided with a first rotating hole. The left shaft end of the roller b1 located on the rear side passes through the first rotating hole on the first bracket, and the right shaft end of the roller b1 located on the rear side passes through the first rotating hole on the second bracket. Through the first rotating holes provided on the first bracket and the second bracket, the roller b1 located on the rear side is rotatably connected to the first bracket and the second bracket.

[0072] Figure 3 The upper surface of the frame body is provided with two slide rails, left and right. The left slide rail is located at the left end of the front side of the upper surface of the frame body, and the right slide rail is located at the right end of the front side of the upper surface of the frame body. Both the left and right slide rails extend back and forth in the horizontal direction. The top of the left slide rail is slidably connected to a third bracket, and the top of the right slide rail is slidably connected to a fourth bracket. The third bracket can slide back and forth along the extension direction of the left slide rail, and the fourth bracket can slide back and forth along the extension direction of the right slide rail. Figure 3 Both the third and fourth supports are provided with second rotating holes. The left shaft end of the front roller b1 passes through the second rotating hole on the third support, and the right shaft end of the front roller b1 passes through the second rotating hole on the fourth support. Through the second rotating holes provided on the third and fourth supports, the roller b1 located on the front is rotatably connected to the third and fourth supports. Figure 3The upper surface of the middle frame body and the front ends of the third and fourth supports are all equipped with roller spacing adjustment mechanisms. The roller spacing adjustment mechanisms include two telescopic motors (not shown in the figure) and two telescopic rods b2. The left telescopic rod b2 is connected to the third support, and the right telescopic rod b2 is connected to the fourth support. Both telescopic motors are fixedly connected to the upper surface of the frame body. The telescopic motors drive the telescopic rods b2 to extend and retract, thereby driving the third and fourth supports to slide back and forth along the left and right slide rails, and driving the front roller b1 to move back and forth relative to the rear roller b1, thus realizing the adjustment of the distance between the front roller b1 and the rear roller b1.

[0073] Specifically, the first bracket, second bracket, third bracket, fourth bracket, left slide rail, right slide rail, telescopic motor and telescopic rod b2 in this invention all adopt conventional devices, connection methods and operation methods in the prior art, and are not the inventive point of this invention, so they will not be described in detail.

[0074] The drive mechanism includes two drive motors b3. The output shafts of the two drive motors b3 are connected to the shaft ends of the two rollers b1 respectively through flexible couplings. The two drive motors b3 can drive the two rollers b1 to rotate at different speeds and in different directions. The specific equipment of the drive motor b3, the connection method with the roller b1, and the operation mode all adopt conventional settings in the prior art and are not the inventive point of this invention, so they will not be described in detail.

[0075] like Figure 4 As shown, the heating and temperature control mechanism includes two electric heating tubes b4, a roller temperature PLC controller b5, and two roller surface temperature infrared thermometers b6; Each of the two rollers b1 is provided with a heating tube placement cavity, and two electric heating tubes b4 are respectively set in the heating tube placement cavities of the two rollers b1; the two roller surface temperature infrared thermometers b6 are respectively set on the upper surface of the frame body and close to the side wall of the two rollers b1. The roller temperature PLC controller b5 is electrically connected to the two electric heating tubes b4 through a slip ring, and the two roller surface temperature infrared thermometers b6 are electrically connected to the roller temperature PLC controller b5. Specifically, the roller temperature PLC controller b5 is equipped with a temperature signal receiving end, a central processing unit control module, and a heating control module; the roller surface temperature infrared thermometer b6 is equipped with a temperature signal transmitting end, which can send the temperature signal to the temperature signal receiving end of the roller temperature PLC controller b5, and the temperature signal receiving end sends the temperature signal to the central processing unit control module; the heating control module is equipped with a heating signal transmitting end and is electrically connected to the electric heating tube b4. During operation, the surface temperature of roller b1 is detected by the infrared thermometer b6 and the temperature signal is sent to the temperature signal receiving end of the roller temperature PLC controller b5. At the same time, the central processing unit control module of the roller temperature PLC controller b5 sets the set temperature and compares the received temperature signal with the set temperature value of the central processing unit control module. If the temperature signal received by the central processing unit control module is lower than the set temperature value of the central processing unit control module, the central processing unit control module sends a signal to the heating control module to start heating and sends it to the electric heating tube b4. The electric heating tube b4 then starts and begins heating.

[0076] Specifically, the infrared thermometer b6 for the roller surface temperature and the electric heating tube b4 are both conventional models in the prior art, and their structure is not the inventive point of this invention, so they will not be described in detail. The electrical signal connection between the signal transmitting end of the infrared thermometer b6 for the roller surface temperature and the temperature signal receiving end of the roller temperature PLC controller b5, and the electrical signal connection between the heating signal transmitting end of the roller temperature PLC controller b5 and the electric heating tube b4 are both conventional settings in the prior art, and are not the inventive point of this invention, so they will not be described in detail.

[0077] The roller temperature PLC controller b5 used in this invention can be of model FX1N-40MT-0001, S7-300, FX3U, S7-1500, etc.; During operation, the surface temperature of roller b1 is detected by infrared thermometer b6 and the temperature signal is sent to roller temperature PLC controller b5. Roller temperature PLC controller b5 is used to monitor the opening and closing of electric heating tube b4. When the infrared thermometer b6 sends the temperature signal to the roller temperature PLC controller b5, if the temperature is lower than the set value, the roller temperature PLC controller b5 controls the electric heating tube b4 to start heating. When the infrared thermometer b6 detects that the temperature is higher than the set value, the roller temperature PLC controller b5 controls the electric heating tube b4 to be turned off. During this period, the temperature detection result of the infrared thermometer b6 is simultaneously sent to the roller temperature PLC controller b5 for data reference, so as to monitor the final temperature change of the slurry in real time.

[0078] The discharge end of the material collector a3 conveys the material to a high position through the material lifting conveyor belt, and causes the material to fall from above the extrusion roller device b onto the surface of the two rollers b1; Roller b1 is made of alloy steel, stainless steel and other materials, and is demagnetized. It has a diameter of 50-150mm and its surface needs to be finely ground with a surface roughness of ≤Ra0.2μm. The surface of roller b1 is coated with tungsten carbide to improve the wear resistance of the roller surface. By sliding the third and fourth supports relative to the frame body, one roller b1 is moved relative to the other roller b1, thereby adjusting the distance between the two rollers b1 and changing the degree of compression of the elastic abrasive particles E1. The distance between the two rollers b1 is usually adjusted to 50-90% of the particle size of the elastic abrasive particles E1. During operation, it is preferable to set two rollers b1 to rotate in opposite directions with a speed difference of 5-15%. By setting the speed difference of rollers b1, on the one hand, it promotes the entry and passage of elastic abrasive E0 or elastic abrasive particles E1 through the gap of rollers b1 to reach the return device c; on the other hand, the difference in linear velocity caused by the speed difference causes the elastic abrasive to be compressed and deformed while passing through the gap of rollers b1, and it also undergoes tensile deformation, which leads to the elastic abrasive being kneaded, which is beneficial for the multi-component abrasive M to be embedded in the surface of elastic core particles H and elastic abrasive particles E0.

[0079] The return material device c includes a return material hopper and a return material lifting conveyor belt (not shown in the figure). The return material hopper is located below the extrusion roller device b. The return material hopper can return the material to the vibrating feeder a1 through the return material lifting conveyor belt. The elastic abrasive particles, after passing through the extrusion roller device b, are conveyed to the vibrating feeder a1 via the return device c, thereby achieving secondary processing, and the extrusion is repeated in this cycle.

[0080] During operation, the temperature of roller b1 is set 5-10°C higher than the melting temperature of the elastic core material. Elastic abrasive particles E0 and E1 are compressed and deformed between the high-temperature roller b1 and rebound. Since the temperature of roller b1 is higher than its own initial melting temperature, partial melting occurs on the surface of elastic abrasive particles E0 and E1. This further increases the degree to which the multi-component abrasive M is embedded in the elastic core particle H and increases the bonding strength of the multi-component abrasive M on the surface of the elastic core particle H. After multiple cycles of extrusion, the superelastic composite abrasive product E is obtained.

[0081] Macroscopic and microscopic images of the hyperelastic composite abrasive prepared in Example 1 are shown below. Figure 1 As shown, from Figure 1 It can be seen that the multi-component abrasive (M) and metal powder (Me) are tightly and uniformly coated on the surface of the superelastic composite abrasive.

[0082] Example 2 Example 2 provides a superelastic composite abrasive for jet polishing, which is prepared from the following raw materials in weight percentage: 100 parts of WHT-1565 polyurethane elastic, 10 parts of LMF / LMF+diamond (particle size M1 / 2), 10 parts of silicon carbide micro powder (particle size W1.5), and 8 parts of metallic copper powder.

[0083] The preparation method in Example 2 differs from that in Example 1 in that: In step 2), weigh out 80 grams of copper powder.

[0084] Example 3 Example 3 provides a superelastic composite abrasive for jet polishing, which is prepared from the following raw materials in weight percentage: 100 parts of WHT-1565 polyurethane elastic, 15 parts of LMF / LMF+diamond (particle size M1 / 2), 10 parts of silicon carbide micro powder (particle size W1.5), and 5 parts of metallic copper powder.

[0085] The preparation method in Example 3 differs from that in Example 1 in that: In step 4), weigh out 75 grams of diamond and 50 grams of silicon carbide abrasive.

[0086] In addition to implementing steps 1) to 7), Example 3 also includes step 8), which is specifically: Repeat steps 4), 5), 6), and 7) once, that is, diamond and silicon carbide micro powder are added in two separate steps, and finally the superelastic composite abrasive product E is obtained.

[0087] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that Comparative Example 1 does not use a roller extrusion device when preparing the elastic abrasive.

[0088] That is, the raw materials used in the preparation of the elastic abrasive in Comparative Example 1 are the same as those in Example 1. The difference between the preparation method of Comparative Example 1 and Example 1 is that it only includes steps 1) to 6) and does not include step 7).

[0089] Performance testing The superelastic composite abrasive product E prepared in Example 1 was compared with commercially available elastic abrasive and the elastic abrasive prepared in Comparative Example 1 to conduct air jet polishing application tests on the test sample (stainless steel material). The polishing parameters were: jet pressure 2.5 kg, polishing roughness requirement Ra 0.1 μm. The polishing time to achieve the desired smoothness, the granulation of diamond abrasive, and the stability of the polishing effect were compared. The results are shown in Table 1.

[0090] Table 1. Comparison of polishing performance of different elastic abrasives.

[0091] As can be seen from the data in Table 1, under the same conditions, the superelastic composite abrasive product E prepared in Example 1 exhibits excellent performance, achieving optimal polishing results in a shorter time, while avoiding dust caused by surface diamond shedding during the polishing process. The elastic abrasive in Comparative Example 1 shows good polishing efficiency and effect; however, due to insufficient bonding force between the diamond and the elastic core, a significant amount of diamond detachment occurs during jet polishing, resulting in noticeable dust. The performance, polishing effect, and efficiency of commercially available elastic abrasive products are all lower than those of Example 1 and Comparative Example 1. Their performance regarding dust caused by diamond detachment is also slightly lower than that of Example 1, but better than that of Comparative Example 1.

[0092] Figure 5 This is a comparison chart of the performance stability of different elastic abrasives. Figure 6 The images show a comparison of the finished superelastic composite abrasive E from Example 1 before and after polishing. It can be seen that the finished superelastic composite abrasive E prepared in Example 1 has a smaller time deviation in achieving the required polishing effect, and its polishing performance is more stable. In contrast, the elastic abrasive product in Comparative Example 1, due to the lack of a roller extrusion device, experienced more diamond particle loss, resulting in a faster decline in polishing performance. The polishing performance of commercially available elastic abrasive products is less stable than that of the finished superelastic composite abrasive E from Example 1, indicating that the elastic abrasive in Example 1 has a stronger bond with the diamond abrasive.

[0093] As can be seen from the above, the superelastic composite abrasive for jet polishing manufactured by the elastic abrasive preparation process and device provided by the present invention has excellent performance. Compared with the elastic abrasives commonly used in the industry, it has the characteristics and advantages of good polishing effect, polishing efficiency and polishing performance stability.

Claims

1. A superelastic composite abrasive for jet polishing, characterized in that, It is prepared using the following parts by weight of raw materials: 80-120 parts of viscoelastic raw material, 5-15 parts of superhard abrasive, 5-15 parts of ordinary abrasive, and 2-8 parts of metal powder.

2. The superelastic composite abrasive for jet polishing as described in claim 1, characterized in that, The viscoelastic raw materials are one or more of thermoplastic styrene-butadiene rubber, thermoplastic polyurethane rubber, and styrene-based thermoplastic elastomers, with a Shore hardness of 45-70 HA and a density range of 0.6-1.3 g / cm³. 3 .

3. The superelastic composite abrasive for jet polishing as described in claim 1, characterized in that, The superhard abrasive is one or two of diamond, cubic boron nitride, etc.; the ordinary abrasive is one or more of cerium oxide, silicon carbide, boron carbide, white corundum, iron oxide; The metal powder can be magnetic iron powder, nickel powder, or non-magnetic copper powder, tungsten powder, cobalt powder, tungsten carbide powder, etc.

4. A method for preparing a superelastic composite abrasive for jet polishing, characterized in that, Includes the following steps: 1) Crush and granulate the viscoelastic raw materials, and obtain elastic core particles (H) with the target particle size range and / or target morphology by mechanical screening; 2) Weigh a certain amount of metal powder (Me) and place it in a mixing tank. Place the mixing tank containing the metal powder (Me) in an electric heating oven. Set the oven temperature to 10-15℃ above the initial melting temperature of the elastic core material (specifically 130~135℃) and keep it at that temperature for 30-60 minutes to ensure that the metal powder (Me) is heated fully and evenly. 3) Take a certain amount of the elastic core particles (H) from step 1) and place them in the mixing tank from step 2). Then place the mixing tank in a ball mill for ball milling and mixing. When the surface temperature of the mixing tank drops to 10-20°C (specifically 110-120°C) below the initial melting temperature of the elastic core material, the mixing tank is removed from the mill to obtain mixture I. Mixture I is then sieved to obtain the first stage of elastic abrasive particles (E0). 4) Weigh out a certain amount of superhard abrasive and a certain amount of ordinary abrasive, mix the superhard abrasive and ordinary abrasive and then sieve to obtain a uniformly dispersed multi-component abrasive (M). 5) Place the multi-component abrasive (M) from step 4) into a mixing tank, and place the mixing tank containing the multi-component abrasive (M) into an electric heating oven. Set the oven temperature to 10-15°C above the initial melting temperature of the elastic core material (specifically 130-135°C) and keep it at that temperature for 30-60 minutes to ensure that the multi-component abrasive (M) is heated fully and uniformly. 6) Place the elastic abrasive particles (E0) from step 3) into the mixing tank from step 5), and then place the mixing tank into a ball mill for ball milling. When the surface temperature of the mixing tank drops to 10-20°C below the initial melting temperature of the elastic core material, the mixing tank is removed from the mill to obtain mixture II. Mixture II is then sieved to obtain the elastic abrasive particles of stage II (E1). 7) Place the elastic abrasive particles (E1) from stage II in an electric heating oven, set the oven temperature to 110~140℃, heat for 30-60 minutes, and then place the elastic abrasive particles (E1) in an elastic abrasive rolling system (D) for rolling to obtain the superelastic composite abrasive product (E).

5. The method as described in claim 4, characterized in that, In step 1), the target particle size range for obtaining the elastic core particles is 0.1-0.2 mm, 0.2-0.4 mm, or 0.4-0.8 mm, or 140-80 mesh, 70-40 mesh, or 35-20 mesh.

6. The method as described in claim 4, characterized in that, In step 3), the mass ratio of elastic core particles (H) to metal powder (Me) ranges from 100:1 to 100:

10.

7. The method as described in claim 4, characterized in that, In step 4), the multi-component abrasive (M) consists of superhard abrasive and ordinary abrasive, with the content of the two being 50-100% by mass percentage, and the content of the ordinary abrasive being 0-60%. In step 4), the particle size range of the multi-component abrasive (M) is 1000#-15000#.

8. The method as described in claim 4, characterized in that, In step 6), the mass ratio of elastic abrasive particles (E0) to multi-component abrasive (M) ranges from 100:10 to 100:

30.

9. The method as described in claim 4, characterized in that, In step 7), the elastic abrasive roller pressing system (D) includes a feeding device, an extrusion roller device, and a return device; The feeding device includes a vibrating feeder, a guide plate, a material collection controller, and a material lifting conveyor belt. The vibrating feeder is located above the material collection controller, with the top of the vibrating feeder being the inlet and the bottom being the outlet. The top of the material collection controller is also the inlet, and the bottom is the outlet. The outlet of the vibrating feeder corresponds to the inlet of the material collection controller. The guide plate is located between the outlet of the vibrating feeder and the inlet of the material collection controller. The extrusion roller assembly includes a frame body, two rollers arranged side by side, a drive mechanism, and a heating and temperature control mechanism; the two rollers are arranged side by side on the upper surface of the frame body. The upper surface of the frame body is also equipped with two roller spacing adjustment mechanisms, which can adjust the distance between the two rollers. The drive mechanism can drive the two rollers to rotate in the same or opposite directions. The heating and temperature control mechanism can heat the two rollers, monitor the side walls or surfaces of the two rollers, and regulate the temperature of the two rollers. The discharge end of the material collection controller transports the material to a high position through the material lifting conveyor belt, and causes the material to fall from above the extrusion roller device onto the surface of the two rollers; The material return device includes a material return hopper and a material return lifting conveyor belt. The material return hopper is located below the extrusion roller device. The material return hopper can return the material to the vibrating feeder via the material return lifting conveyor belt. After passing through the extrusion roller device, the elastic abrasive particles are conveyed to the vibrating feeder through the return device, thereby achieving secondary processing, and the extrusion is repeated in this cycle.

10. The application of the superelastic composite abrasive for jet polishing according to any one of claims 1 to 3 in jet polishing of metal or alloy parts for aerospace or aviation applications.

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