High-performance conformal magnetic grinding and polishing tool

Abstract

A high-performance conformal magnetic grinding and polishing tool is composed of a rotating shaft, a rigid base body disc, a magnetic pole carrier, a magnetic pole and a magnetic grinding material, and is characterized in that the magnetic grinding material is adsorbed around the magnetic pole; the magnetic pole is connected with the magnetic pole carrier through a first bonding layer; the magnetic pole carrier is connected with the rigid base body disc through a second bonding layer; the rigid base body disc is connected with the rotating shaft in a fastening mode through threads. The magnetic grinding and polishing tool is simple in preparation process, good in process flexibility and stable in machining performance, the shape follow-up performance of the magnetic grinding and polishing tool is not limited by workpiece shape features, and the magnetic grinding and polishing tool has unique superiority in the aspect of grinding and polishing machining of complex curved surface workpieces or special-shaped workpieces.

Description

Technical Field

[0001] The invention relates to a grinding and polishing tool, in particular to a flexible magnetic grinding and polishing tool, specifically to a high-performance conformal magnetic grinding and polishing tool for processing complex curved surfaces. Background Art

[0002] Aircraft engines are known as the jewel in the crown of modern industry and are a key area of ​​competition among the world's major powers. As the core components of aircraft engines, the processing quality of free-form surface parts directly determines the working performance of aircraft engines. The grinding and polishing of free-form surfaces is the last step in the manufacturing of aircraft engine blades. It can further remove the knife marks and fine cracks left on the blade surface by milling, correct the blade contour shape, and make the blade meet the required contour accuracy and surface roughness. It plays a vital role in improving the surface accuracy and surface processing quality of aircraft engine blades. At present, aircraft engine blades are mostly made of high-strength, high-hardness difficult-to-process materials (such as high-temperature alloys, titanium alloys, etc.). The free-form surface is complex, the structural rigidity is weak, the geometric accuracy requirements are high, and the processing consistency is difficult.

[0003] Chinese patent CN219562711U proposes a flexible grinding and polishing belt wheel, which uses an elastic support body to map the generatrix shape of the support body to the shape of the workpiece being polished in the form of grinding contact, thereby realizing the flexible grinding and polishing shaping function of the grinding belt wheel, and solving the problems of consistency in grinding the blade root fillet and transition continuity between the blade root and the blade body. Chinese patent CN102615597A proposes a rotating abrasive flow polishing method for integral impeller parts, which realizes a feeding / liquid supply system for timing and bidirectional supply and control of abrasive flow and cleaning liquid, and solves the problems of easy interference, blade over-polishing, chamfering, dead angles and uneven polishing of integral impeller parts during polishing. Chinese patent CN113070789B proposes a method for polishing small and medium-sized aircraft engine compressor blades, which divides the blade profile into multiple polishing areas, determines the polishing trajectory and selects the polishing tool, thereby realizing high-precision polishing of small and medium-sized blades.

[0004] The existing grinding and polishing methods for free-form surface parts cannot simultaneously meet the processing requirements of high efficiency, high flexibility, high conformability and low damage. Summary of the invention

[0005] The content of the present invention is to address the poor stability of existing free-form surface grinding and polishing, which is very easy to produce interference and cannot simultaneously meet the processing requirements of high efficiency, high flexibility, high conformality and low damage. A conformal magnetic polishing tool with simple preparation and complex surface processing is invented, and a preparation method thereof is also provided. The tool has the advantages of high processing efficiency, stable processing performance, high surface accuracy, etc., and is used for free-form surface finishing of titanium alloys.

[0006] The technical solution of the present invention is:

[0007] A high-performance conformal magnetic polishing tool and a preparation method thereof. The tool consists of a rotating shaft, a rigid base disk, a magnetic pole carrier, a magnetic pole and a magnetic abrasive. The tool is characterized in that the magnetic abrasive is adsorbed around the magnetic pole; the magnetic pole and the magnetic pole carrier are connected by a first bonding layer; the magnetic pole carrier is connected to the rigid base disk by a second bonding layer; and the rigid base disk is fastened to the rotating shaft by threads.

[0008] The magnetic abrasive 1 is prepared by mixing an iron matrix, diamond abrasive and a binder in a certain proportion.

[0009] The magnetic pole 2 is a combination of a cylinder and a cylindrical sector, with a bottom area of ​​10-75 square millimeters and a height of 5-15 millimeters. The arrangement can be one of N / S, NS or NSN.

[0010] The magnetic pole carrier 3 is one of elastic polyurethane, polyamide, silicone rubber, nylon fiber or styrene, and its Shore hardness is 40-90. The magnetic pole carrier 3 is designed according to the end face and circumferential combination arrangement of the magnetic pole 2, with a diameter of 20-50 mm and a height consistent with the magnetic pole height.

[0011] The rigid base plate 4 is cylindrical step-shaped, with a diameter of 10-50 mm and a height of 5-15 mm.

[0012] The first adhesive layer 6 and the second adhesive layer 7 are one of or a combination of silicone glue, AB epoxy resin glue, or crystal glue.

[0013] The rotating shaft 5 has a diameter of 5-20 mm and a length of 40-150 mm.

[0014] The end of the rigid base plate 4 is provided with a screw hole 8 for fixed connection with the rotating shaft 5, and the diameter of the screw hole 8 is 5-20 mm.

[0015] The beneficial effects of the present invention are:

[0016] The magnetic polishing tool of the present invention adopts magnetic abrasives, which can conform to the shape and complex geometric features of the workpiece surface when controlled by the magnetic field, thereby achieving efficient and uniform processing.

[0017] The magnetic poles of the magnetic polishing tool of the present invention adopt radial magnetic poles, and the magnetic lines of force are distributed along the radial direction, which can achieve polishing processing while avoiding interference and collision between the tool and the workpiece surface, thereby improving processing stability.

[0018] The magnetic poles of the magnetic polishing tool of the present invention are arranged in a combination of end faces and circumferential directions, which effectively solves the problem of insufficient abrasive adsorption in the edge area of ​​the small tool and greatly improves the processing efficiency.

[0019] The magnetic pole carrier of the magnetic polishing tool of the present invention is made of elastic material, which undergoes certain deformation when subjected to polishing pressure to adapt to changes in the surface shapes of various complex free-form surface parts and realize flexible adaptive polishing.

[0020] The magnetic polishing tool of the present invention can be widely used in titanium alloy free-form surface processing, and has low manufacturing cost, good conformability, high processing efficiency, stable processing performance, and high processing surface accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an overall cross-sectional view of the magnetic polishing tool of the present invention.

[0022] Figure 2 It is a structural schematic diagram of the magnetic polishing tool of the present invention.

[0023] Figure 3 It is a schematic diagram of the magnetic pole arrangement of the magnetic polishing tool of the present invention.

[0024] The specific markings in the figure are as follows: 1-magnetic abrasive; 2-magnetic pole; 3-magnetic pole carrier; 4-rigid base disk; 5-rotating axis; 6-first bonding layer; 7-second bonding layer; 8-screw hole; 9-groove; 10-N pole magnetic pole; 11-S pole magnetic pole. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] like Figure 1 , Figure 2 shown.

[0027] A high-performance conformable magnetic polishing tool, consisting of a rotating shaft 5, a rigid base disk 4, a magnetic pole carrier 3, a magnetic pole 2 and a magnetic abrasive 1, wherein the magnetic abrasive 1 is adsorbed around the magnetic pole 2; the magnetic pole 2 and the magnetic pole carrier 3 are connected by a first bonding layer 6; the magnetic pole carrier and the rigid base disk are connected by a second bonding layer 7; the rigid base disk 4 and the rotating shaft 5 are fastened by threads 8.

[0028] like Figure 3 As shown, the magnetic pole 2 described in the present invention is a combination of a cylinder and a cylindrical sector, with a bottom area of ​​10-75 square millimeters and a height of 5-15 millimeters. The arrangement can be one of N / S, NS or NSN. The N pole (10) and the S pole (11) are bonded to the magnetic pole carrier 3 according to the magnetic pole design arrangement by an adhesive.

[0029] The magnetic pole carrier 3 described in the present invention is one of elastic polyurethane, polyamide, silicone rubber, nylon fiber or styrene, and its Shore hardness is 40-90, so as to adapt to the changes in the surface shape of various complex free-form surface parts and realize flexible adaptive polishing.

[0030] The rigid base plate 4 is a cylindrical stepped structure with a diameter of 10-50 mm and a height of 5-15 mm.

[0031] The first adhesive layer 6 and the second adhesive layer 7 are one of silicone glue, AB epoxy resin glue or crystal glue or a combination thereof. The diameter of the rotating shaft 5 is 5-20 mm and the length is 40-150 mm. The end of the rigid base plate 4 is provided with a screw hole 8 for fixed connection with the rotating shaft 5, and the diameter of the screw hole 8 is 5-20 mm.

[0032] The magnetic polishing tool of the present application is suitable for the polishing of titanium alloy free-form surfaces, and can also be used for the polishing of other similar workpieces. The following will illustrate the specific application of the magnetic polishing tool of the present application with several examples:

[0033] Example 1.

[0034] like Figure 3 shown.

[0035] According to the processing requirements of TC4 titanium alloy workpieces with free-form surface features, diamond with a particle size of 10-20 microns, an iron matrix and a binder (such as epoxy resin, which can be purchased directly from the market, the same below) are selected and evenly mixed in a ratio of (1:5:0.1), and then a thermal curing agent and an accelerator are added. After stirring evenly again, the magnetic abrasive used for magnetic polishing tools can be obtained by heating and pressurizing to cure the mixture.

[0036] The bottom area is 20mm 2 The combined magnetic poles of a 10mm high cylinder and a cylindrical sector are bonded to a polyurethane magnetic pole carrier with a diameter of 30mm and a height of 10mm using special silicone glue in an NSN arrangement. The magnetic pole carrier is bonded to a rigid base disk with a diameter of 30mm and a height of 12mm using crystal glue. The rotating shaft is fastened to the rigid base disk, and the milling and polishing test of TC4 titanium alloy free-form surface workpieces is carried out on an ABB robot platform. The radial magnetic poles are close to the workpiece surface and maintain a machining gap of 1.5mm with it. The polishing pressure is 0.024MPa, the electric spindle speed is 800rpm, the polishing liquid is an oily polishing liquid, the polishing liquid flow rate is 1000ml / min, and the surface roughness Ra of the workpiece before polishing is 950nm. After 5 minutes of polishing, the surface roughness Ra of the workpiece is reduced to 145nm after testing.

[0037] When the above-mentioned polishing pressure was changed to 0.020MPa and other conditions and parameters remained unchanged, after polishing for 5 minutes, the surface roughness Ra of the workpiece dropped to 183.7nm.

[0038] Example 2.

[0039] In view of the processing requirements of high-temperature alloy workpieces with free-form surface features, diamond with a particle size of 20-30 microns, an iron matrix and a binder are selected and evenly mixed in a ratio of (1:10:0.5), and then a thermal curing agent and an accelerator are added. After stirring evenly again, the mixture is heated and pressurized to be cured and formed, and the magnetic abrasive used in magnetic polishing tools can be obtained.

[0040] The bottom area is 45mm 2 The combined magnetic poles of a cylinder with a height of 12 mm and a cylindrical sector are bonded to a silicone rubber magnetic pole carrier with a diameter of 40 mm and a height of 12 mm using crystal glue in an NS arrangement. The magnetic pole carrier is bonded to a rigid base disk with a diameter of 40 mm and a height of 14 mm using AB epoxy resin glue. The rotating shaft is fastened to the rigid base disk, and the milling and polishing test of a high-temperature alloy free-form surface workpiece is carried out on an ABB robot platform. The radial magnetic pole is close to the workpiece surface and maintains a machining gap of 1.5 mm with it. The polishing pressure is 0.016 MPa, the electric spindle speed is 800 rpm, the polishing liquid is an oily polishing liquid, the polishing liquid flow rate is 1000 ml / min, and the surface roughness Ra of the workpiece before polishing is 950 nm. After 5 minutes of polishing, the surface roughness Ra of the workpiece is reduced to 214.3 nm.

[0041] When the above-mentioned polishing pressure was changed to 0.012MPa and other conditions and parameters remained unchanged, after polishing for 5 minutes, the surface roughness Ra of the workpiece dropped to 232.6nm.

[0042] Example 3.

[0043] According to the processing requirements of TC4 titanium alloy workpieces with free-form surface features, diamond with a particle size of 30-40 microns, an iron matrix and a binder are selected and evenly mixed in a ratio of (1:15:0.6), and then a thermal curing agent and an accelerator are added. After stirring evenly again, the mixture is heated and pressurized to cure and form, and the magnetic abrasive used in magnetic polishing tools can be obtained.

[0044] The bottom area is 75mm 2 The combined magnetic poles of a 15mm high cylinder and a cylindrical sector are bonded to a polyamide magnetic pole carrier with a diameter of 50mm and a height of 15mm using AB epoxy resin glue in an N / S arrangement. The magnetic pole carrier is bonded to a rigid base disk with a diameter of 50mm and a height of 17mm using a combination of special silicone glue and crystal glue. The rotating shaft is fastened to the rigid base disk, and the milling and polishing test of TC4 titanium alloy free-form surface workpieces is carried out on an ABB robot platform. The radial magnetic poles are close to the workpiece surface and maintain a machining gap of 1.5mm with it. The polishing pressure is 0.020MPa, the electric spindle speed is 800rpm, the polishing liquid is an oily polishing liquid, the polishing liquid flow rate is 1000ml / min, and the surface roughness Ra of the workpiece before polishing is 950nm. After 5 minutes of polishing, the surface roughness Ra of the workpiece is reduced to 225nm.

[0045] When the above-mentioned polishing pressure was changed to 0.016MPa and other conditions and parameters remained unchanged, after polishing for 5 minutes, the surface roughness Ra of the workpiece dropped to 241.7nm.

[0046] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

[0047] The present invention does not involve parts that are the same as the prior art or can be implemented by using the prior art.

Claims

1. A high-performance conformal magnetic polishing tool, characterized in that: The polishing tool comprises, from bottom to top, a magnetic abrasive (1), a magnetic pole (2), a magnetic pole carrier (3), a rigid base disk (4) and a rotating shaft (5); the magnetic abrasive (1) is adsorbed around the magnetic pole (2), the magnetic pole (2) and the magnetic pole carrier (3) are connected via a first bonding layer (6), the magnetic pole carrier (3) and the rigid base disk (4) are connected via a second bonding layer (7), and the rigid base disk (4) and the rotating shaft (5) are fixedly connected via threads.

2. The high-performance conformable magnetic polishing tool according to claim 1, characterized in that: The magnetic abrasive (1) is prepared by mixing an iron matrix, diamond abrasive and a binder in a certain proportion to form the magnetic abrasive.

3. The high-performance conformable magnetic polishing tool according to claim 1, characterized in that: The magnetic pole (2) is a combination of a cylinder and a cylindrical sector, has a bottom area of ​​10-75 square millimeters, a height of 5-15 millimeters, and is arranged in one of N / S, NS or NSN.

4. The high-performance conformable magnetic polishing tool according to claim 1, characterized in that: The magnetic pole carrier (3) is one of elastic polyurethane, polyamide, silicone rubber, nylon fiber or styrene, and has a Shore hardness of 40-90. The magnetic pole carrier (3) is designed based on the end face and circumferential combination arrangement of the magnetic pole (2), has a diameter of 20-50 mm, and has a height consistent with the height of the magnetic pole (2).

5. The high-performance conformable magnetic polishing tool according to claim 1, characterized in that: The rigid base plate (4) is cylindrical and stepped, with a diameter of 10-50 mm and a height of 5-15 mm.

6. The high-performance conformable magnetic polishing tool according to claim 1, characterized in that: The first adhesive layer (6) and the second adhesive layer (7) are one of special silicone glue, AB epoxy resin glue or crystal glue, or a combination thereof.

7. The high-performance conformable magnetic polishing tool according to claim 1, characterized in that: The rotating shaft (5) has a diameter of 5-20 mm and a length of 40-150 mm.

8. The high-performance conformable magnetic polishing tool according to claim 1, characterized in that: The end of the rigid base plate (4) is provided with a screw hole (8) for fixed connection with the rotating shaft (5), and the diameter of the screw hole (8) is 5-20 mm.

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