A raceway sealing method for phosphating tapered roller bearings

Abstract

The present invention discloses a method for closing a raceway for phosphating a tapered roller bearing, which uses an inner ring closing mold and an outer ring closing mold. The inner ring closing mold includes a base, an inner ring fastening screw, an inner ring upper cover plate, an inner ring locking nut, and upper and lower flat washers. The plane of the base is cross-shaped and a spherical support pier is fixed on the top surface of each of the four outer ends; the inner ring fastening screw is inserted into the countersunk through hole of the base; the upper and lower inner hole surfaces of the inner ring upper cover plate are cylindrical and conical surfaces corresponding to each other, and the inner ring upper cover plate is sleeved on the upper part of the inner ring fastening screw through the screw hole on the top plate; the inner ring locking nut is installed on the head of the inner ring fastening screw that passes through the inner ring upper cover plate; the upper and lower flat washers are sleeved between the raceway surface of the inner ring of the bearing and the upper and large ribs of the inner ring. The outer ring closing mold includes an outer ring lower cover plate, an outer ring upper cover plate and an outer ring fastening assembly. The present invention utilizes the inner and outer ring closed molds to effectively prevent the raceway surface of the bearing ring from contacting with the phosphating liquid during the phosphating process.

Description

Technical Field

[0001] This invention relates to a raceway sealing method for phosphating tapered roller bearings. Background Technology

[0002] Phosphating is a commonly used surface treatment method for bearings. After phosphating, the wear resistance and corrosion resistance of bearing rings can be improved.

[0003] However, phosphating is generally applied to the entire bearing raceway. After phosphating, the roughness of the bearing raceway surface slightly increases. Furthermore, during the initial use (break-in period), worn phosphating residue can mix with the lubricating grease, contaminating it. All of these factors can cause a significant increase in bearing temperature during initial use, negatively impacting later run-in. Moreover, because phosphating is a chemical reaction, the depth of the phosphating layer is difficult to control. Later in the bearing's lifespan, after the phosphating layer has worn away, uneven phosphating pits may appear on the raceway surface, which can feel slightly to the touch and negatively affect bearing performance.

[0004] For the reasons mentioned above, phosphating the outer surface of the bearing while leaving the inner raceway surface unphosphated is the best approach. However, the typical phosphating method involves immersing the entire bearing raceway in the phosphating bath, so a sealing device is needed to completely enclose the raceway surface of the bearing raceway to prevent it from contacting the phosphating solution during the phosphating process. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects of the prior art and provide a raceway sealing method for phosphating tapered roller bearings, which can effectively prevent the bearing rings from coming into contact with the phosphating liquid during the phosphating process.

[0006] The objective of this invention is achieved as follows: a raceway sealing method for phosphating tapered roller bearings, employing an inner ring sealing mold and an outer ring sealing mold; wherein,

[0007] The inner ring sealing mold includes a base, an inner ring fastening screw, an inner ring upper cover plate, an inner ring locking nut, an upper flat washer, and a lower flat washer;

[0008] The base has a cross-shaped plane. A countersunk hole is opened on the center bottom surface of the base. The four outer ends of the base are located on a circle whose diameter matches the outer diameter of the inner ring of the bearing. A spherical support block is fixed on the top surface of each of the four outer ends of the base.

[0009] The inner ring fastening screw is inserted upward through the countersunk hole of the base;

[0010] The inner ring cover plate includes a top plate and a sleeve; a screw through hole is opened in the center of the top plate and several liquid permeable holes are evenly distributed around the screw through hole; the sleeve is connected to the bottom edge of the top plate, the upper inner surface of the sleeve is a cylindrical surface with a height adapted to the height of the small flange of the bearing inner ring, the lower inner surface of the sleeve is a conical surface with a height adapted to the height of the raceway surface of the bearing inner ring, the taper of the lower inner surface of the sleeve is adapted to the taper of the raceway surface of the bearing inner ring, and the inner diameter of the lower inner surface of the sleeve is larger than the outer diameter of the raceway surface of the bearing inner ring; the inner ring cover plate is sleeved on the upper part of the inner ring fastening screw through the screw through hole on the top plate.

[0011] The inner ring locking nut is installed on the head of the inner ring fastening screw that protrudes from the inner ring cover plate;

[0012] The upper flat washer is fitted between the top of the raceway surface of the inner ring of the bearing and the bottom surface of the small flange of the inner ring of the bearing.

[0013] The lower flat washer is fitted between the bottom of the raceway surface of the inner ring of the bearing and the top surface of the large flange of the inner ring of the bearing.

[0014] The outer ring sealing mold includes an outer ring lower cover plate, an outer ring upper cover plate, and an outer ring fastening assembly;

[0015] The outer ring lower cover plate is a disc with a diameter that is clearance-fitted with the inner diameter of the lower tooth of the bearing outer ring and has a countersunk thread through hole in the center of the bottom surface. An arc-shaped lower ring groove is formed on the upper part of the outer diameter surface of the outer ring lower cover plate, and a sealing ring is fitted in the lower ring groove.

[0016] The outer ring cover plate is a disc with a diameter that is clearance-fitted to the inner diameter of the upper tooth of the bearing outer ring and has a through hole in the center of its surface. An arc-shaped upper ring groove is formed at the lower part of the outer diameter surface of the outer ring cover plate, and an upper sealing ring is fitted in the upper ring groove.

[0017] The outer ring fastening assembly includes an outer ring fastening screw, an outer ring locking nut, a locking head, and a locking bar. The outer ring fastening screw is connected upwards to the countersunk threaded through hole of the lower outer ring cover plate and inserted into the through hole of the upper inner ring cover plate. The outer ring locking nut is mounted on the outer ring fastening screw and located on the top surface of the lower outer ring cover plate. The locking head is a cylinder with a radial through hole at its upper part and a threaded blind hole on its bottom surface. The locking bar is inserted into the through hole of the locking head, and the locking head is connected to the end of the outer ring fastening screw, which protrudes from the top surface of the upper outer ring cover plate, through the threaded blind hole.

[0018] The raceway sealing method for phosphating tapered roller bearings includes the following steps:

[0019] Step 1 involves sealing the raceway surface of the bearing inner ring using an inner ring sealing mold, including the following steps:

[0020] S11, insert the inner ring fastening screw upwards into the countersunk hole of the base;

[0021] S12, place the large end face of the bearing inner ring downwards on the four spherical support blocks of the base of the inner ring closed mold;

[0022] S13, fasten the inner ring cover plate onto the small end face of the bearing inner ring and fit it onto the upper part of the inner ring fastening screw until the lower inner hole surface of the inner ring cover plate contacts the outer end face of the upper flat washer and the outer end face of the lower flat washer, respectively.

[0023] S14, connect the inner ring locking nut to the upper part of the inner ring fastening screw that passes through the screw hole of the inner ring cover plate, press down the inner ring cover plate, and further tighten the upper flat washer and lower flat washer on the lower inner hole surface of the inner ring cover plate to complete the sealing of the raceway surface of the bearing inner ring.

[0024] Step 2 involves sealing the raceway surface of the bearing outer ring using an outer ring sealing mold, including the following steps:

[0025] S21, first install the outer ring tightening screw and outer ring locking nut on the outer ring lower cover plate, then put the lower sealing ring into the lower ring groove of the outer ring lower cover plate;

[0026] S22, fit the lower thread of the bearing outer ring onto the outer ring lower cover plate until the lower sealing ring is embedded in the lower thread groove of the bearing outer ring;

[0027] S23, insert the outer ring cover plate into the upper thread of the bearing outer ring until the upper sealing ring in the upper ring groove of the outer ring cover plate is embedded in the upper thread groove of the bearing outer ring.

[0028] S24. First, install the locking head on the end of the outer ring clamping screw that is exposed on the top surface of the outer ring cover plate. Then, insert the locking rod into the through hole of the locking head and then turn the locking rod to tighten the locking head, so that the outer ring cover plate is fixed on the outer ring clamping screw, thus completing the sealing of the raceway surface of the bearing outer ring.

[0029] Step 3: Immerse the inner bearing ring mounted on the inner ring closed mold and the outer bearing ring mounted on the outer ring closed mold into the phosphating bath. The outer diameter surfaces of the large and small flanges of the inner bearing ring, the large and small end faces of the inner bearing ring, and the inner diameter surface of the inner bearing ring are in full contact with the phosphating solution in the phosphating bath to complete the phosphating reaction. The outer diameter surface of the outer bearing ring, the two end faces of the outer bearing ring, and the upper and lower teeth of the outer bearing ring are in full contact with the phosphating solution to complete the phosphating reaction.

[0030] Step 4: After the phosphating operation is completed, remove the inner bearing ring installed on the inner ring sealing mold and the outer bearing ring installed on the outer ring sealing mold from the phosphating tank. Remove the inner ring sealing mold in the reverse order of the installation steps, and at the same time remove the outer ring sealing mold in the reverse order of the installation steps.

[0031] In the above-mentioned method for sealing the raceway for phosphating tapered roller bearings, an inverted U-shaped handle with a height lower than the height of the through hole of the locking head is fixed on the top surface of the outer ring cover plate of the outer ring sealing mold on both sides of the through hole; during process four, the outer ring cover plate inserted into the upper tooth of the bearing outer ring is removed by means of the two handles.

[0032] The aforementioned raceway sealing method for phosphating tapered roller bearings includes an outer ring fastening assembly of the outer ring sealing mold, which further comprises two rubber washers and two steel washers. The two rubber washers are fitted onto the outer ring fastening screw and are correspondingly located between the screw head of the outer ring fastening screw and the stepped surface of the countersunk threaded through hole of the lower outer ring cover plate, as well as on the top surface of the upper outer ring cover plate. The two steel washers are fitted onto the outer ring fastening screw and are correspondingly located on the top surface of the lower outer ring cover plate and on the bottom surface of the locking head.

[0033] The raceway sealing method for phosphating tapered roller bearings of the present invention is characterized by:

[0034] 1. This invention uses corresponding closed molds for both the inner and outer rings of the bearing during phosphating. The closed molds have a simple structure, are easy to process, and are convenient to assemble and disassemble.

[0035] 2. The closed mold used in this invention can completely seal the raceway surface of the bearing ring, with a good sealing effect. It can effectively prevent the raceway surface of the bearing ring from contacting the phosphating liquid during the phosphating process, thereby improving the performance of high-precision bearings. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the inner ring closed mold used in this invention;

[0037] Figure 1a This is a top view of the base in the inner ring closed mold used in this invention;

[0038] Figure 1b This is a top view of the inner ring upper cover plate in the inner ring closed mold used in this invention;

[0039] Figure 1c This is an axial cross-sectional view of the inner ring upper cover plate in the inner ring closed mold used in this invention;

[0040] Figure 2 This is a schematic diagram of the outer ring closed mold used in this invention;

[0041] Figure 2aThis is an axial cross-sectional view of the outer ring closed mold used in this invention;

[0042] Figure 3 This is a state diagram of the third step in the process of performing the raceway closure method of the present invention. Detailed Implementation

[0043] The invention will now be further described with reference to the accompanying drawings.

[0044] The raceway sealing method for phosphating tapered roller bearings of the present invention employs an inner ring sealing mold 1 and an outer ring sealing mold 2.

[0045] See also Figure 1 , Figure 1a , Figure 1b and Figure 1c The inner ring sealing mold 1 includes a base 10, an inner ring fastening screw 12, an inner ring upper cover plate 13, an inner ring locking nut 14, an upper flat washer 15, and a lower flat washer 16; wherein,

[0046] The base 10 has a cross-shaped plane. A countersunk through hole 100 is opened on the center bottom surface of the base 10. The four outer ends of the base 10 are located on a circle whose diameter matches the outer diameter of the inner ring 3A of the bearing. A spherical support block 11 is fixed on the top surface of each of the four outer ends of the base 10.

[0047] The inner ring fastening screw 12 is inserted upward through the countersunk hole 100 of the base 10;

[0048] The inner ring upper cover plate 13 includes a top plate 131 and a sleeve 132. A screw through hole 130 is opened in the center of the top plate 131, and four liquid permeable holes 133 are evenly distributed around the screw through hole 130. The sleeve 132 is connected to the bottom edge of the top plate 131. The upper inner hole surface 1321 of the sleeve 132 is a cylindrical surface with a height adapted to the height of the small flange of the inner ring 3A of the bearing. The lower inner hole surface 1322 of the sleeve 132 is a conical surface with a height adapted to the height of the raceway of the inner ring 3A of the bearing. The taper of the lower inner hole surface 1322 of the sleeve 132 is adapted to the taper of the raceway surface of the inner ring 3A of the bearing. The inner diameter of the lower inner hole surface 1322 of the sleeve 132 is slightly larger than the outer diameter of the raceway surface of the inner ring 3A of the bearing. The inner ring upper cover plate 13 is fitted onto the upper part of the inner ring fastening screw 12 through the screw through hole 130 on the top plate 131.

[0049] The inner ring locking nut 14 is installed on the head of the inner ring fastening screw 12 that protrudes from the inner ring cover plate 13;

[0050] The upper flat washer 15 is fitted between the top of the raceway surface of the inner ring 3A of the bearing and the bottom surface of the small flange of the inner ring 3A of the bearing.

[0051] The lower flat washer 16 is fitted between the bottom of the raceway surface of the inner ring 3A of the bearing and the top surface of the large flange of the inner ring 3A of the bearing.

[0052] Both the upper flat washer 15 and the lower flat washer 16 are made of high-temperature resistant materials.

[0053] See also Figure 2 and Figure 2a The outer ring sealing mold 2 includes an outer ring lower cover plate 20, an outer ring upper cover plate 22, and an outer ring fastening assembly; wherein,

[0054] The outer ring lower cover plate 20 is a disc with a diameter that is clearance-fitted with the inner diameter of the lower tooth of the bearing outer ring 3B, and a countersunk thread through hole is opened in the center of the bottom surface. An arc-shaped lower ring groove is opened on the upper part of the outer diameter surface of the outer ring lower cover plate 20, and a lower sealing ring 21 is fitted in the lower ring groove.

[0055] The outer ring upper cover plate 22 is a disc with a diameter that is clearance-fitted with the inner diameter of the upper tooth of the bearing outer ring 3B and has a through hole in the center of its surface. An arc-shaped upper ring groove is formed at the lower part of the outer diameter surface of the outer ring upper cover plate 22, and an upper sealing ring 23 is fitted in the upper ring groove. An inverted U-shaped handle 220 is fixed on the top surface of the outer ring upper cover plate 22 on both sides of the through hole.

[0056] The fastening assembly includes an outer ring fastening screw 24, an outer ring locking nut 25, a locking head 26, a locking rod 27, two rubber washers 28, and two steel washers 29. The outer ring fastening screw 24 is connected upwards to the countersunk threaded through hole of the outer ring lower cover plate 20 and inserted into the through hole of the inner ring upper cover plate 22. The outer ring locking nut 25 is mounted on the outer ring fastening screw 24 and is located on the top surface of the outer ring lower cover plate 20. The locking head 26 is a cylinder with a height greater than the height of the handle 220 on the outer ring upper cover plate 22. A through hole is radially opened in the upper part of the locking head 26, and the bottom surface of the locking head 26... A threaded blind hole is provided; a locking rod 27 is inserted into the through hole of a locking head 26, which is connected to the end of the outer ring fastening screw 24 exposed on the top surface of the outer ring upper cover plate 22 via the threaded blind hole; two rubber washers 28 are fitted onto the outer ring fastening screw 24 and are located correspondingly between the threaded head of the outer ring fastening screw 24 and the stepped surface of the countersunk threaded through hole of the outer ring lower cover plate 20, as well as on the top surface of the outer ring upper cover plate 22; two steel washers 29 are fitted onto the outer ring fastening screw 24 and are located correspondingly on the top surface of the outer ring lower cover plate 20 and the bottom surface of the locking head 26. Both rubber washers 28 are high-temperature resistant O-rings.

[0057] Before use, the inner ring sealing mold 1 and the outer ring sealing mold 2 need to be phosphated to prevent the mold from reacting with the phosphate solution, which would result in insufficient phosphate reaction of the bearing inner ring 3A and the bearing outer ring 3B. This also prevents mold corrosion and extends the service life of the mold.

[0058] Please see again Figure 3 The raceway sealing method for phosphating tapered roller bearings of the present invention includes the following steps:

[0059] Step 1 involves sealing the raceway surface of the bearing inner ring 3A using inner ring sealing mold 1, including the following steps:

[0060] S11, the inner ring fastening screw 12 is inserted upward into the countersunk through hole 100 of the base 10;

[0061] S12, place the large end face of the bearing inner ring 3A downward on the four spherical support blocks 11 of the base 10 of the inner ring closed mold 1;

[0062] S13, fasten the inner ring upper cover plate 13 onto the small end face of the bearing inner ring 3A and fit it onto the upper part of the inner ring fastening screw 12 until the lower inner hole surface 1322 of the inner ring upper cover plate 13 contacts the outer end face of the upper flat washer 15 and the outer end face of the lower flat washer 16 respectively.

[0063] S14, connect the inner ring locking nut 14 to the upper part of the inner ring fastening screw 12 through the screw hole 130 of the inner ring upper cover plate 13, press down the inner ring upper cover plate 13, so that the lower inner hole surface 1322 of the inner ring upper cover plate 13 further tightens the upper flat washer 15 and the lower flat washer 16, thus completing the sealing of the raceway surface of the bearing inner ring 3A;

[0064] Step 2 involves sealing the raceway surface of the bearing outer ring 3B using the outer ring sealing mold 2, including the following steps:

[0065] S21, first install the outer ring clamping screw 24, the outer ring locking nut 25, a rubber washer 28 and a steel washer 29 on the outer ring lower cover plate 20, and then put the lower sealing ring 21 into the lower ring groove of the outer ring lower cover plate 20;

[0066] S22, fit the lower thread of the bearing outer ring 3B over the outer ring lower cover plate 20 until the lower sealing ring 21 is embedded in the lower thread groove of the bearing outer ring 3B;

[0067] S23, insert the outer ring upper cover plate 22 into the upper tooth of the bearing outer ring 3B until the upper sealing ring 23 fitted in the upper ring groove of the outer ring upper cover plate 22 is embedded in the upper tooth groove of the bearing outer ring 3B.

[0068] S24, first install the locking head 26 on the end of the outer ring clamping screw 24 that is exposed on the top surface of the outer ring cover plate 22 through another sealing washer 18 and another steel washer 29. Then insert the locking rod 27 into the through hole of the locking head 26, and then turn the locking rod 27 to tighten the locking head 26, so that the outer ring cover plate 22 is fixed on the outer ring clamping screw 24, thus completing the sealing of the raceway surface of the bearing outer ring 3B;

[0069] Step 3: Immerse the bearing inner ring 3A mounted on the inner ring sealing mold 1 and the bearing outer ring 3B mounted on the outer ring sealing mold 2 into the phosphating bath (see...). Figure 3 Because the inner ring upper cover plate 13 of the inner ring sealing mold 1 has a liquid permeation hole 133, the base 10 adopts a cross structure, and there is a cavity between the inner ring upper cover plate 13 and the small end face of the bearing inner ring 3A, the outer diameter surfaces of the large and small flanges of the bearing inner ring 3A, the large and small end faces of the bearing inner ring 3A, and the inner diameter surface of the bearing inner ring 3A are fully in contact with the phosphating liquid 4 to complete the phosphating reaction; because the two ends of the raceway surface of the bearing outer ring 3B are correspondingly sealed by the outer ring lower cover plate 20 and the outer ring upper cover plate 22 of the outer ring sealing mold 2, only the outer diameter surface of the bearing outer ring 3B, the two end faces of the bearing outer ring 3B, the lower tooth of the bearing outer ring 3B with a gap to the outer end face of the outer ring lower cover plate 20, and the upper tooth of the bearing outer ring 3B with a gap to the outer end face of the outer ring upper cover plate 22 can fully contact the phosphating liquid 4 to complete the phosphating reaction;

[0070] Step 4: After the phosphating operation is completed, the bearing inner ring 3A installed on the inner ring sealing mold 1 and the bearing outer ring 3B installed on the outer ring sealing mold 2 are removed from the phosphating tank. The inner ring sealing mold 1 is removed in the reverse order of installation. At the same time, the outer ring sealing mold 2 is removed in the reverse order of installation. Since the sealing cavity of the outer ring sealing mold 2 has a large volume, it is easy to form a negative pressure. Therefore, the two handles 220 fixed on the top surface of the outer ring upper cover plate 22 are used to pull the outer ring upper cover plate 22 out from the upper tooth of the bearing outer ring 3B.

[0071] The above embodiments are for illustrative purposes only and are not intended to limit the invention. Those skilled in the art can make various changes or modifications without departing from the spirit and scope of the invention. Therefore, all equivalent technical solutions should also fall within the scope of the invention and should be defined by the claims.

Claims

1. A method for closing the raceway of a tapered roller bearing for phosphating, using an inner ring closing mold and an outer ring closing mold; wherein: The inner ring closed mold comprises a base, an inner ring fastening screw, an inner ring upper cover plate, an inner ring locking nut, an upper flat washer and a lower flat washer; The plane of the base is cross-shaped, a countersunk through hole is provided on the central bottom surface of the base, the four outer ends of the base are located on a circle whose diameter matches the outer diameter of the inner ring of the bearing, and a spherical supporting pier is fixed on the top surface of each of the four outer ends of the base; The inner ring fastening screw is upwardly inserted into the countersunk through hole of the base; The inner ring upper cover plate comprises a top plate and a sleeve; a screw through hole is provided at the center of the top plate and a plurality of liquid permeable holes are evenly distributed around the screw through hole; the sleeve is connected to the bottom edge of the top plate, the upper inner hole surface of the sleeve is a cylindrical surface whose height matches the height of the small rib of the inner ring of the bearing, the lower inner hole surface of the sleeve is a conical surface whose height matches the height of the raceway surface of the inner ring of the bearing, the taper of the lower inner hole surface of the sleeve matches the taper of the raceway surface of the inner ring of the bearing, and the inner diameter of the lower inner hole surface of the sleeve is larger than the outer diameter of the raceway surface of the inner ring of the bearing; the inner ring upper cover plate is sleeved on the upper part of the inner ring fastening screw through the screw through hole on the top plate; The inner ring locking nut is installed on the head of the inner ring fastening screw that passes through the inner ring upper cover plate; The upper flat washer is sleeved between the top of the raceway surface of the inner ring of the bearing and the bottom surface of the small rib of the inner ring of the bearing; The lower flat washer is sleeved between the bottom of the raceway surface of the inner ring of the bearing and the top surface of the large rib of the inner ring of the bearing; The outer ring closed mold comprises an outer ring lower cover plate, an outer ring upper cover plate and an outer ring fastening assembly; The outer ring lower cover plate is a disc with a diameter that matches the inner diameter clearance of the lower tooth opening of the bearing outer ring and a countersunk threaded through hole is provided at the center of the bottom surface. An arc-shaped lower ring groove is provided on the upper part of the outer diameter surface of the outer ring lower cover plate, and a lower sealing ring is sleeved in the lower ring groove. The outer ring upper cover plate is a disc with a diameter that matches the inner diameter clearance of the upper tooth opening of the bearing outer ring and has a through hole in the center of the surface. An arc-shaped upper ring groove is formed at the lower part of the outer diameter surface of the outer ring upper cover plate, and an upper sealing ring is sleeved in the upper ring groove. The outer ring fastening assembly comprises an outer ring fastening screw, an outer ring locking nut, a locking head and a locking rod; the outer ring fastening screw is upwardly connected to the countersunk threaded through hole of the outer ring lower cover plate and inserted into the through hole of the inner ring upper cover plate; the outer ring locking nut is mounted on the outer ring fastening screw and is located on the top surface of the outer ring lower cover plate; the locking head is a cylinder, a through hole is radially provided on the upper part of the locking head, and a threaded blind hole is provided on the bottom surface of the locking head; the locking rod is inserted into the through hole of the locking head, and the locking head is connected to the end of the outer ring fastening screw exposed on the top surface of the outer ring upper cover plate through the threaded blind hole; Characterized in that the raceway sealing method for phosphating a tapered roller bearing comprises the following process: Process 1, using the inner ring closing mold to close the raceway surface of the inner ring of the bearing, includes the following steps: S11, insert the inner ring fastening screw upward into the countersunk through hole of the base; S12, placing the large end face of the inner ring of the bearing downward on four spherical support piers of the base of the inner ring closed mold; S13, buckle the inner ring upper cover plate onto the small end face of the inner ring of the bearing and put it onto the upper part of the inner ring fastening screw until the lower inner hole surface of the inner ring upper cover plate contacts the outer end face of the upper flat washer and the outer end face of the lower flat washer respectively. S14, connect the inner ring locking nut to the upper part of the inner ring fastening screw that passes through the screw hole of the inner ring upper cover plate, press the inner ring upper cover plate downward, so that the lower inner hole surface of the inner ring upper cover plate further tightens the upper flat washer and the lower flat washer, and completes the sealing of the raceway surface of the inner ring of the bearing; Process 2, using an outer ring closing mold to close the raceway surface of the bearing outer ring, includes the following steps: S21, first install the outer ring clamping screw and the outer ring locking nut on the outer ring lower cover plate, and then put the lower sealing ring into the lower ring groove of the outer ring lower cover plate; S22, sleeve the lower tooth of the outer ring of the bearing onto the outer cover of the outer ring until the lower sealing ring is embedded in the lower tooth groove of the outer ring of the bearing; S23, inserting the outer ring upper cover plate into the upper tooth opening of the bearing outer ring until the upper sealing ring sleeved in the upper ring groove of the outer ring upper cover plate is embedded in the upper tooth opening groove of the bearing outer ring; S24, first install the locking head on the end of the outer ring clamping screw exposed on the top surface of the outer ring upper cover plate, insert the locking rod into the through hole of the locking head, and then turn the locking rod to tighten the locking head, so that the outer ring upper cover plate is fixed on the outer ring clamping screw, and the raceway surface of the bearing outer ring is sealed; Process three: immerse the inner ring of the bearing installed on the inner ring closed mold and the outer ring of the bearing installed on the outer ring closed mold into the phosphating tank, and the outer diameter surface of the large and small ribs of the inner ring of the bearing, the large and small end surfaces of the inner ring of the bearing, and the inner diameter surface of the inner ring of the bearing are fully in contact with the phosphating liquid in the phosphating tank to complete the phosphating reaction; the outer diameter surface of the outer ring of the bearing, the two end surfaces of the outer ring of the bearing, and the upper and lower teeth of the outer ring of the bearing are fully in contact with the phosphating liquid to complete the phosphating reaction; Process 4: After the phosphating operation is completed, the inner ring of the bearing installed on the inner ring closed mold and the outer ring of the bearing installed on the outer ring closed mold are taken out of the phosphating tank, and the inner ring closed mold is removed in the opposite steps of the installation steps, and the outer ring closed mold is removed in the opposite steps of the installation steps.

2. The method for sealing the raceway of a tapered roller bearing for phosphating according to claim 1, characterized in that: An inverted U-shaped handle whose height is lower than the height of the through hole of the locking head is fixed on the top surface of the outer ring upper cover plate of the outer ring closed mold and on both sides of the through hole; when performing process four, the outer ring upper cover plate inserted in the upper tooth opening of the bearing outer ring is removed with the help of the two handles.

3. The method for sealing the raceway of a tapered roller bearing for phosphating according to claim 1, characterized in that: The outer ring fastening assembly of the outer ring closed mold also includes two rubber washers and two steel washers; the two rubber washers are both sleeved on the outer ring fastening screw and are located one by one between the screw head of the outer ring fastening screw and the step surface of the countersunk threaded through hole of the outer ring lower cover plate and the top surface of the outer ring upper cover plate; the two steel washers are both sleeved on the outer ring fastening screw and are located one by one on the top surface of the outer ring lower cover plate and the bottom surface of the locking head.

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