A reinforcement ring structure, preparation process and application

Abstract

A reinforcement ring structure, a preparation process and an application belong to the technical field of reinforcement ring structures. The reinforcement ring structure is sleeved on both ends of an armature coil and comprises a rigid layer and an insulating layer. A phosphating saponification layer is arranged outside the rigid layer, and an insulating layer is coated on the inner side of the phosphating saponification layer. The insulating layer and the outer insulating paint of the armature coil are interpenetrated and fused. The beneficial effect of the present invention is that the reinforcement ring structure has a certain strength, and at the same time, the contact part with the armature coil has insulation, good heat resistance, and a high degree of fusion with the insulating paint outside the armature coil, thereby improving the reliability, working stability and service life of the starter rotor.

Description

Technical Field

[0001] The present invention relates to the technical field of reinforcement ring structures, and in particular to a reinforcement ring structure, a preparation process and an application thereof. Background Art

[0002] The starter motor in the starter or engine consists of a stator magnetic field, a rotor armature and a commutator. In order to increase the torque, a multi-pole magnetic field is used, and there are usually four magnetic fields. When the current passes through the armature coil, the entire coil will rotate under a torque. Due to the high rotation speed of the rotor, the mechanical strength of the armature coil part located on the outside of the two ends of the rotor core is difficult to overcome the centrifugal force, and it often deforms outward and bulges, thereby touching the excitation coil on the stator. When the insulating paint between the excitation coil and the armature coil is damaged by scratches and conducts, the starter will be burned. In order to ensure the reliability of the normal use of the rotor, the armature coil on the outside of the two ends of the armature core needs to be covered with an annular reinforcement ring on the outer circumference to overcome the centrifugal force generated by high-speed rotation.

[0003] However, most of the traditional reinforcement rings are made of steel rings. Although the reinforcement rings of this structure have good strength and rigidity, they have the following disadvantages: First, the rigid reinforcement ring is not sufficiently bonded to the armature coil, and the reinforcement ring will often separate from the armature coil due to the excessively high rotation speed of the rotor. In order to increase the bonding strength with the armature coil, the reinforcement ring is tightened around the armature coil by reducing its inner diameter, but this will cause the outer diameter formed by the armature coil to shrink inward, making it difficult for the starter to achieve its maximum output torque; second, the rigid reinforcement ring has poor insulation performance. If the insulating paint of the armature coil is scratched and damaged, the leakage current will not be reduced, and this will also bring safety risks to the normal operation of the rotor. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a reinforcement ring structure, which has a certain strength, and the contact part with the armature coil is insulating, has good heat resistance, and is highly fusion-compatible with the insulating paint outside the armature coil, thereby improving the reliability, working stability and service life of the starter rotor.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention to solve its technical problem is: the reinforcement ring structure is sleeved on both ends of the armature coil, including a rigid layer and an insulating layer, a phosphating saponification layer is arranged outside the rigid layer, the inner side of the phosphating saponification layer is coated with the insulating layer, and the insulating layer and the outer layer of the armature coil The insulating paint is interpenetrated and fused.

[0006] Furthermore, the rigid layer is processed from 65Mn, the thickness of the rigid layer is set to 0.3-0.7 mm, the thickness of the phosphating and saponifying layer is set to 9-20 um, and the thickness of the insulating layer is set to 2-4 mm.

[0007] Furthermore, the widths of the rigid layer and the insulating layer are equal, and the width is set to be 2-10 mm.

[0008] A preparation process of the reinforcement ring structure comprises the following steps:

[0009] 1) Prepare insulating layer coating material: the coating material includes the following raw materials in parts by weight: 3-5 parts of polyester resin, 1.5-2.5 parts of polyester imide resin, 0.8-1.2 parts of polyurethane, 0.8-1.2 parts of epoxy resin, 0.1-0.5 parts of curing agent and 1-1.5 parts of diluent.

[0010] 2) Cold working and stretching of seamless steel pipes inside and outside, cutting and cutting: After the 65Mn seamless steel pipe with an inner diameter of 47.8-47.9mm and a thickness of 1.2-1.35mm is cold worked and stretched inside and outside to an inner diameter of 48-48.05mm and a thickness of 1-1.05mm, it is cut into steel pipe sections of 500-1000mm;

[0011] 3) Heat treatment of the cut steel pipe sections;

[0012] 4) Pretreatment of the steel pipe surface: clean the dirt on the steel pipe surface and treat the steel pipe surface by phosphating and saponification process;

[0013] 5) Inner wall insulation layer coating and drying treatment: the above coating material is coated on the inner wall of the steel pipe section until the thickness reaches 2 to 4 mm, and the steel pipe section coated with the coating material is dried;

[0014] 6) Post-processing of steel pipe sections: Process the inner wall of the dried steel pipe sections, cut the steel pipe sections according to the required width, and then remove burrs and flash from the cut products.

[0015] Furthermore, in the step 1), the coating material comprises 3 parts of polyester resin, 2 parts of polyester imide resin, 1 part of polyurethane, 1 part of epoxy resin, 0.25 parts of curing agent and 1 part of diluent.

[0016] Furthermore, in the step 1), the coating material includes 4 parts of polyester resin, 2 parts of polyester imide resin, 1 part of polyurethane, 1 part of epoxy resin, 0.25 parts of curing agent and 1 part of diluent.

[0017] Furthermore, in the step 1), the coating material includes 5 parts of polyester resin, 2 parts of polyester imide resin, 1 part of polyurethane, 1 part of epoxy resin, 0.25 parts of curing agent and 1 part of diluent.

[0018] Furthermore, the coating material in step 1) includes 4 parts of polyester resin, 2 parts of polyester imide resin, 1 part of polyurethane, 1 part of epoxy resin, 0.1 part of curing agent and 1 part of diluent.

[0019] Furthermore, in the step 1), the coating material comprises 4 parts of polyester resin, 2 parts of polyester imide resin, 1 part of polyurethane, 1 part of epoxy resin, 0.5 part of curing agent and 1 part of diluent.

[0020] Furthermore, the curing agent in the coating material is a modified hydrazide latent curing agent, including a hydrazide compound and an epoxy compound, wherein the molar ratio of the hydrazide group to the epoxy group is 1:0.5-2.5, and the diluent is set to be an active epoxy resin diluent.

[0021] Furthermore, in the step 2), the method for cold working and stretching the inside and outside of the 65Mn seamless steel pipe with an inner diameter of 47.8 to 47.9 mm is to use a drawing machine to position the two ends of the seamless steel pipe and then stretch it, with a stretching force of 10,000 to 20,000 N, a stretching speed of 80 to 120 mm / Min, and a stretching time of 40 to 60 minutes.

[0022] Furthermore, the heat treatment method in step 3) is to heat the cut steel pipe section to 820-840°C, cool it in oil at a temperature of 0-30°C, and then reheat the steel pipe section to 530-550°C, and cool it in water or oil at a temperature of 0-30°C.

[0023] An application of the reinforcement ring structure is characterized in that it is used to be sleeved on both ends of an armature coil inside a starter motor of a starter or an engine.

[0024] The beneficial effects of the present invention are:

[0025] 1. The present invention designs a reinforcement ring with a double-layer composite structure, including an outer rigid layer and an inner insulating layer. The rigid layer is connected to the insulating layer through a phosphating saponification layer, so that the coating and bonding strength of the insulating layer is stronger, thereby improving the stability of the overall structure. Since the outer layer adopts the rigid layer, the rigidity and strength of the entire reinforcement ring are good. The inner layer adopts the insulating layer, which is resistant to high temperature, thermal expansion, and has good insulation performance, and has certain plastic deformation, good interpenetration and fusion with the insulating paint, and can withstand greater axial peeling force, thereby improving the reliability of the starter.

[0026] 2. The insulating layer of the reinforcement ring in the present invention is prepared from a coating material including polyester resin, polyester imide resin, polyurethane, epoxy resin, curing agent and diluent. By setting different ratios, reinforcement rings with different strengths, insulation properties, heat resistance and degree of fusion with insulating paint can be obtained, which can meet the needs of high-end products.

[0027] 3. The reinforcement ring in the present invention is made of a seamless steel pipe by means of internal and external cold working and stretching to the required inner diameter and thickness. The steel pipe section is cut into a set length and then subjected to heat treatment to improve the hardness and strength of the steel pipe section. After the surface dirt is removed, the surface of the steel pipe section is phosphated and saponified to improve the adhesion and smoothness of the coating material on the inner side of the steel pipe section, thereby improving the structural stability of the entire reinforcement ring.

[0028] In summary, the reinforcement ring structure involved in the present invention has a certain strength, and at the same time has insulation properties in the contact part with the armature coil, good heat resistance, and a high degree of fusion with the insulating paint outside the armature coil, thereby improving the reliability, working stability and service life of the starter rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The following is a brief description of the contents expressed in the drawings of the present specification and the marks in the drawings:

[0030] Figure 1 It is a structural schematic diagram of the reinforcement ring structure in the present invention;

[0031] The markings in the above figures are: 1. Rigid layer, 2. Insulating layer, 3. Phosphate saponification layer. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The specific implementation scheme of the present invention is: Figure 1As shown, a reinforcement ring structure is sleeved on both ends of the armature coil inside the starter motor of the starter or engine, including a rigid layer 1 and an insulating layer 2. A phosphating saponification layer 3 is arranged outside the rigid layer 1, and the inner side of the phosphating saponification layer 3 is coated with an insulating layer 2. The insulating layer 2 and the outer insulating paint of the armature coil are interpenetrated and fused, so that the coating and bonding strength of the insulating layer 2 is stronger, and the stability of the overall structure is improved. Since the outer layer adopts the rigid layer 1, the rigidity and strength of the entire reinforcement ring are good, and the inner layer adopts the insulating layer 2, which is resistant to high temperature, thermal expansion, and good insulated performance, and has a certain degree of plastic deformation, good interpenetration and fusion with the insulating paint, and can withstand greater axial peeling force, thereby improving the reliability of the starter.

[0035] Specifically, the rigid layer 1 is made of 65Mn, and the thickness of the rigid layer 1 is set to 0.3-0.7mm. The rigid layer 1 has good rigidity and high strength; the thickness of the phosphating saponification layer 3 is set to 9-20um, which improves the adhesion and smoothness of the insulating layer 2. The thickness of the insulating layer 2 is set to 2-4mm. The widths of the rigid layer 1 and the insulating layer 2 are equal, and the width is set to 2-10mm, which can effectively cover the end of the armature coil.

[0036] The preparation process of the reinforcement ring structure comprises the following steps:

[0037] 1) Prepare an insulating layer coating material: The coating material includes the following raw materials in parts by weight: 3 to 5 parts of polyester resin, 1.5 to 2.5 parts of polyester imide resin, 0.8 to 1.2 parts of polyurethane, 0.8 to 1.2 parts of epoxy resin, 0.1 to 0.5 parts of curing agent and 1 to 1.5 parts of diluent, wherein the curing agent is a modified hydrazide latent curing agent, including a hydrazide compound and an epoxy compound, wherein the molar ratio of the hydrazide group to the epoxy group is 1:0.5-2.5, and the diluent is set to an active epoxy resin diluent.

[0038] 2) Cold working and stretching, cutting and cutting of seamless steel pipes: The 65Mn seamless steel pipe with an inner diameter of 47.8-47.9mm and a thickness of 1.2-1.35mm is positioned at both ends of the seamless steel pipe by a drawing machine, and then cold-worked and stretched inside and outside. The stretching force is 10000-20000N, the stretching speed is 80-120mm / Min, and the stretching time is 40-60 minutes. After stretching to an inner diameter of 48.0-48.05mm and a thickness of 1.0-1.05mm, it is cut into multiple steel pipe sections of 500-1000mm.

[0039] 3) Heat treatment of the cut steel pipe sections: heat the cut steel pipe sections to 820-840°C, cool them in oil at a temperature of 0-35°C, then reheat the steel pipe sections to 530-550°C, and cool them in water or oil at a temperature of 0-35°C.

[0040] 4) Pretreatment of the steel pipe surface: Use ultrasonic cleaning equipment to clean the dirt on the surface of the steel pipe, and use phosphating and saponification processes to treat the surface of the steel pipe.

[0041] 5) Inner wall insulation layer coating and drying treatment: Coat the inner wall of the steel pipe section with the above coating material until the thickness reaches 2-4 mm, and place the steel pipe section coated with the coating material in a drying furnace at a temperature of 110-130° C. for 30-45 minutes;

[0042] 6) Post-processing of the steel pipe section: The inner wall of the dried steel pipe section is turned at a speed of 1400-1600rpm and a feed rate of 140-160mm / min. The inner wall of the steel pipe section is smoothed, and then the steel pipe section is cut according to the required width, and then the cut product is deburred and flashed.

[0043] The following embodiments take coating materials with different ratios coated on the inner side of the rigid layer 1 as an example to specifically illustrate the preparation process of the obtained reinforcement ring and the performance of the prepared reinforcement ring.

[0044] Example 1

[0045] The preparation process of the reinforcement ring structure is as follows:

[0046] 1) Prepare the insulating layer coating material: mix 3 parts of polyester resin, 2 parts of polyester imide resin, 1 part of polyurethane, 1 part of epoxy resin, 0.25 parts of curing agent and 1 part of diluent to obtain the coating material.

[0047] 2) Cold working and stretching, cutting and cutting of seamless steel pipes: The 65Mn seamless steel pipe with an inner diameter of 47.8-47.9mm and a thickness of 1.2-1.35mm is positioned at both ends of the seamless steel pipe by a drawing machine, and then cold-worked and stretched inside and outside. The stretching force is 10000N, the stretching speed is 80mm / Min, and the stretching time is 40-60 minutes. After stretching to an inner diameter of 48.0-48.05mm and a thickness of 1.0-1.05mm, it is cut into multiple 500mm steel pipe sections.

[0048] 3) Heat treatment of the cut steel pipe sections: heat the cut steel pipe sections to 820-840°C, cool them in oil at a temperature of 0-30°C, then reheat the steel pipe sections to 530-550°C, and cool them in water or oil at a temperature of 0-30°C.

[0049] 4) Pretreatment of the steel pipe surface: Use ultrasonic cleaning equipment to clean the dirt on the surface of the steel pipe, and use phosphating and saponification processes to treat the surface of the steel pipe.

[0050] 5) Inner wall insulation layer coating and drying treatment: Coat the inner wall of the steel pipe section with the coating material of the above ratio until the thickness reaches 2.5 mm, and place the steel pipe section coated with the coating material in a drying furnace at a temperature of 120-145° C. for 25-75 minutes;

[0051] 6) Post-processing of the steel pipe section: The inner wall of the dried steel pipe section is turned at a speed of 1400-1600rpm and a feed rate of 140-160mm / min. The inner wall of the steel pipe section is smoothed, and then the steel pipe section is cut according to the required width, and then the cut product is deburred and flashed.

[0052] The obtained reinforcement ring is subjected to performance tests, including tests on strength, insulation performance, heat resistance and degree of integration with insulating paint. The strength test is performed by radial loading through a tensile testing machine to test the radial destructive force that the reinforcement ring can withstand when it is destroyed; the insulation performance test is performed by using a withstand voltage tester, connecting the test electrodes in the equipment to the inner and outer rings of the reinforcement ring, adjusting the loading voltage, and loading the highest non-breakdown voltage when the leakage current is greater than 1mA; the heat resistance test is performed by placing the reinforcement ring in a constant temperature box at 250°C for 2 hours. After returning to room temperature, the strength decreases by nearly 15%. This temperature limit is the tolerable temperature of the reinforcement ring; the degree of integration of the insulating paint is tested by placing the reinforcement ring on the end of the armature coil impregnated with insulating paint, and then performing axial loading through a tensile testing machine to test the axial peeling force.

[0053] After the above tests, it was found that the radial destructive force that the reinforcement ring can withstand is 2400N, the insulation performance is a withstand voltage of 3400V, the temperature that can be tolerated is 260°C, and the axial peeling force is 1200N.

[0054] Example 2

[0055] The preparation process of the reinforcement ring structure is different from that of Example 1 in the ratio of the coating material, that is, 4 parts of polyester resin, 2 parts of polyester imide resin, 1 part of polyurethane, 1 part of epoxy resin, 0.25 parts of curing agent and 1 part of diluent are mixed to obtain the coating material. The coating material of the above ratio is coated on the inner wall of the steel pipe section until the thickness reaches 2.5 mm, and the steel pipe section coated with the coating material is placed in a drying furnace at a temperature of 125 to 145°C for 30 to 45 minutes; the steel pipe section is post-processed to obtain the desired reinforcement ring.

[0056] After performance testing, it was found that the radial destructive force that the above-mentioned reinforcement ring can withstand is 2800N, the insulation performance is a withstand voltage of 3350V, the temperature that can be tolerated is 275°C, and the axial peeling force is 1450N.

[0057] Example 3

[0058] The preparation process of the reinforcement ring structure is different from that of Example 1 in the ratio of the coating material, that is, 5 parts of polyester resin, 2 parts of polyester imide resin, 1 part of polyurethane, 1 part of epoxy resin, 0.25 parts of curing agent and 1 part of diluent are mixed to obtain the coating material. The coating material of the above ratio is coated on the inner wall of the steel pipe section until the thickness reaches 2.5 mm, and the steel pipe section coated with the coating material is placed in a drying furnace at a temperature of 125 to 145°C and dried for 30 to 45 minutes; the steel pipe section is post-processed to obtain the required reinforcement ring.

[0059] After performance testing, it was found that the radial destructive force that the reinforcement ring can withstand is 2550N, the insulation performance is a withstand voltage of 3200V, the temperature that can be tolerated is 270°C, and the axial peeling force is 1250N.

[0060] Example 4

[0061] The preparation process of the reinforcement ring structure is different from that of Example 2 in the ratio of the coating material, that is, 4 parts of polyester resin, 2 parts of polyester imide resin, 1 part of polyurethane, 1 part of epoxy resin, 0.1 part of curing agent and 1 part of diluent are mixed to obtain the coating material. The coating material of the above ratio is coated on the inner wall of the steel pipe section until the thickness reaches 2.5 mm, and the steel pipe section coated with the coating material is placed in a drying furnace at a temperature of 120 to 135°C and dried for 60 to 75 minutes; the steel pipe section is post-processed to obtain the required reinforcement ring.

[0062] After performance testing, it was found that the radial destructive force that the reinforcement ring can withstand is 2500N, the insulation performance is a withstand voltage of 3300V, the temperature that can be tolerated is 250°C, and the axial peeling force is 1300N.

[0063] Example 5

[0064] The preparation process of the reinforcement ring structure is different from that of Example 2 in the ratio of the coating material, that is, 4 parts of polyester resin, 2 parts of polyester imide resin, 1 part of polyurethane, 1 part of epoxy resin, 0.5 parts of curing agent and 1 part of diluent are mixed to obtain the coating material. The coating material of the above ratio is coated on the inner wall of the steel pipe section until the thickness reaches 2.5 mm, and the steel pipe section coated with the coating material is placed in a drying furnace at a temperature of 125 to 145°C and dried for 25 to 40 minutes; the steel pipe section is post-processed to obtain the required reinforcement ring.

[0065] After performance testing, it was found that the radial destructive force that the above-mentioned reinforcement ring can withstand is 2350N, the insulation performance is a withstand voltage of 3250V, the temperature that can be tolerated is 255°C, and the axial peeling force is 1350N.

[0066] It can be seen from the above-mentioned Examples 1 to 5 that the reinforcement ring using the coating material ratio of Example 2 has better performance, and too little or too much content of the polyester resin and the curing agent will affect the performance of the reinforcement ring.

[0067] Comparative Example 1

[0068] The comparative example provides a reinforcing ring structure including a rigid layer made of No. 10 steel, the rigid layer having a thickness of 1.4 mm and an inner diameter of 47 mm, and the inner side of the reinforcing ring is bonded to the end of the armature coil by a pressure-sensitive adhesive tape.

[0069] After the above performance tests were performed on the reinforcement ring, it was found that the radial destructive force that the reinforcement ring can withstand is 1000-1500N, the insulation performance is 1000V withstand voltage, the temperature that can be tolerated is 300-350°C, and the axial peeling force is 300-500N. In addition to having better heat resistance than the reinforcement rings in Examples 1, 2, 3, 4, and 5, the radial destructive force, insulation performance, and axial peeling force that the reinforcement ring can withstand are all lower than those of the reinforcement rings in Examples 1, 2, 3, 4, and 5.

[0070] Comparative Example 2

[0071] The comparative example provides a reinforcement ring structure made of glass fiber composite material, with a thickness of 2.6 mm and an inner diameter of 47 mm. After the above performance test of the reinforcement ring, it is found that the radial destructive force that the reinforcement ring can withstand is 500-1000 N, the insulation performance is 3000 V withstand voltage, the temperature that can be tolerated is 180-220° C., and the axial peeling force is 1000-1500 N. All the performances of the reinforcement ring do not reach the performances of the reinforcement rings in Examples 1, 2, 3, 4, and 5.

[0072] In summary, the reinforcement ring structure involved in the present invention has a certain strength, and at the same time has insulation properties in the contact part with the armature coil, good heat resistance, and a high degree of fusion with the insulating paint outside the armature coil, thereby improving the reliability, working stability and service life of the starter rotor.

[0073] The above description is only used to illustrate some principles of the present invention. This specification is not intended to limit the present invention to the specific structure and application scope shown and described. Therefore, all corresponding modifications and equivalents that may be used belong to the patent scope applied for by the present invention.

Claims

1. A process for preparing a reinforcement ring structure, characterized in that: The reinforcing ring structure is sleeved on both ends of the armature coil, and comprises a rigid layer (1) and an insulating layer (2); a phosphating saponified layer (3) is arranged outside the rigid layer (1); the insulating layer (2) is coated on the inner side of the phosphating saponified layer (3); the insulating layer (2) and the outer insulating varnish of the armature coil are interpenetrated and fused; the preparation process comprises the following steps: 1) Configuring an insulating layer (2) Coating material: The coating material comprises the following raw materials in parts by weight: 3-5 parts of polyester resin, 1.5-2.5 parts of polyester imide resin, 0.8-1.2 parts of polyurethane, 0.8-1.2 parts of epoxy resin, 0.1-0.5 parts of curing agent and 1-1.5 parts of diluent; 2) Cold working and stretching of seamless steel pipes inside and outside, cutting and cutting: After the 65Mn seamless steel pipe with an inner diameter of 47.8~47.9mm and a thickness of 1.2~1.35mm is cold worked and stretched inside and outside to an inner diameter of 48~48.05mm and a thickness of 1~1.05mm, it is cut into 500~1000mm steel pipe sections; 3) Heat treatment of the cut steel pipe sections; 4) Pretreatment of the steel pipe surface: clean the dirt on the steel pipe surface and treat the steel pipe surface by phosphating and saponification process; 5) Inner wall insulation layer (2) coating and drying: the above-mentioned coating material is coated on the inner wall of the steel pipe section until the thickness reaches 2-4 mm, and the steel pipe section coated with the coating material is dried; 6) Post-processing of steel pipe sections: Process the inner wall of the dried steel pipe sections, cut the steel pipe sections according to the required width, and then remove burrs and flash from the cut products.

2. The process for preparing the reinforcement ring structure according to claim 1, characterized in that: The rigid layer (1) is made of 65Mn, the thickness of the rigid layer (1) is set to 0.3-0.7 mm, the thickness of the phosphating saponified layer (3) is set to 9-20 μm, and the thickness of the insulating layer (2) is set to 2-4 mm.

3. The preparation process of the reinforcement ring structure according to claim 1, characterized in that: The rigid layer (1) and the insulating layer (2) have the same width, and the width is set to be 2-10 mm.

4. The process for preparing the reinforcement ring structure according to claim 1, characterized in that: The coating material in step 1) includes 3 parts of polyester resin, 2 parts of polyester imide resin, 1 part of polyurethane, 1 part of epoxy resin, 0.25 parts of curing agent and 1 part of diluent.

5. The process for preparing the reinforcement ring structure according to claim 1, characterized in that: The coating material in step 1) includes 4 parts of polyester resin, 2 parts of polyester imide resin, 1 part of polyurethane, 1 part of epoxy resin, 0.25 parts of curing agent and 1 part of diluent.

6. The process for preparing the reinforcement ring structure according to claim 1, characterized in that: The coating material in step 1) includes 5 parts of polyester resin, 2 parts of polyester imide resin, 1 part of polyurethane, 1 part of epoxy resin, 0.5 parts of curing agent and 1 part of diluent.

7. The process for preparing the reinforcement ring structure according to any one of claims 1 to 6, characterized in that: The curing agent in the coating material is a modified hydrazide latent curing agent, including a hydrazide compound and an epoxy compound, wherein the molar ratio of the hydrazide group to the epoxy group is 1:0.5-2.5, and the diluent is set to be an active epoxy resin diluent.

8. The process for preparing the reinforcement ring structure according to claim 1, characterized in that: The method for cold working and stretching the inside and outside of the 65Mn seamless steel pipe with an inner diameter of 47.8-47.9 mm in the step 2) is to use a drawing machine to position the two ends of the seamless steel pipe and then stretch it, with a stretching force of 10000-20000 N, a stretching speed of 80-120 mm / Min, and a stretching time of 40-60 minutes; the heat treatment method in the step 3) is to heat the cut steel pipe section to 820-840°C, cool it in oil at a temperature of 0-30°C, and then reheat the steel pipe section to 530-550°C and cool it in water or oil at a temperature of 0-30°C.

9. A reinforcement ring structure, characterized in that: The method is prepared by the preparation process as described in any one of claims 1 to 8.

10. An application of the reinforcement ring structure according to claim 9, characterized in that: Used to be sleeved on both ends of the armature coil inside the starter motor of the starter or engine.

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