A single-row tapered roller bearing outer ring shaping process

Abstract

The present application relates to the technical field of bearing ring shaping, in particular to a single-row tapered roller bearing outer ring shaping process. The outer diameter of the single-row tapered roller bearing outer ring near the A end face is measured, and the A end face outer diameter deformation high point and the A end face outer diameter deformation low point are marked to obtain the diameter variation; the outer diameter of the single-row tapered roller bearing outer ring near the B end face is measured, and the B end face outer diameter deformation high point and the B end face outer diameter deformation low point are marked to obtain the diameter variation; the position of the top die is determined, the top die tool is started, and the outer diameter deformation low point becomes the outer diameter deformation high point through the force of the tool; the shaping is completed, and heating and heat preservation are carried out through the annealing furnace. According to the diameter variation of the two side end faces of the single-row tapered roller bearing outer ring, a reasonable top die formula is determined, the shaping position and the top die degree are strictly controlled, and a large reverse deformation amount is adopted to ensure that the diameter variation after shaping is within the allowable range.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing ring shaping, in particular to a single-row tapered roller bearing outer ring shaping process. Background Art

[0002] Bainite and martensite are two common microstructures in metallic materials. The structure of bainite is a composite of needle-shaped or plate-shaped austenite grains and fine, planar carbides. Martensite, on the other hand, is a collection of carbide particles composed of unstable austenite grains formed at non-uniform temperatures. Due to the different formation principles and compositions of bainite and martensite, their hardness and toughness also differ. Martensite is harder than bainite, while bainite is tougher than martensite. Generally, bainite is the main material microstructure in mechanical equipment that requires high toughness, such as bearings, while martensite is more suitable in other scenarios that require high hardness.

[0003] Therefore, depending on different application scenarios, some single-row tapered roller bearing outer rings are made of martensite, while others are made of bainite. Single-row tapered roller bearing outer rings with different organizational structures will inevitably undergo thermal deformation after heat treatment. Due to different organizational structures and characteristics, the degree of deformation also varies. How to reshape the outer rings of single-row tapered roller bearings made of different materials after heat treatment needs to be solved urgently. Summary of the Invention

[0004] In view of the defects of the prior art, the present invention provides a single-row tapered roller bearing outer ring shaping process, which strictly controls the shaping position and the degree of top shaping according to the diameter variation of the end faces on both sides of the single-row tapered roller bearing outer ring, and adopts a large reverse shaping amount to ensure that the diameter variation after shaping is within the tolerance range.

[0005] In order to achieve the above-mentioned purpose, the technical solution provided by the present invention is a single-row tapered roller bearing outer ring shaping process, wherein the single-row tapered roller bearing outer ring has an A end face and a B end face, and the specific steps include:

[0006] S100, measure the outer diameter of the outer ring of the single-row tapered roller bearing close to the A end face, and mark the high point of the outer diameter deformation of the A end face and the low point of the outer diameter deformation of the A end face to obtain the diameter variation S A ;

[0007] Measure the outer diameter of the outer ring of the single-row tapered roller bearing near the B end face, and mark the high point and low point of the outer diameter deformation of the B end face to obtain the diameter variation S B ;

[0008] S200,

[0009] Such as diameter change S A and diameter variation SB One of them is greater than the standard deformation threshold, the angle between the high point of outer diameter deformation of end face A and the low point of outer diameter deformation of end face A is less than 90°, the high point of outer diameter deformation of end face A corresponds to the high point of outer diameter deformation of end face B, the low point of outer diameter deformation of end face A corresponds to the low point of outer diameter deformation of end face B, and the diameter change S A and diameter variation S B When the difference between them is between 0.5 mm and 1.0 mm, S300 is started;

[0010] Such as diameter change S A and diameter variation S B The angle between the high point of outer diameter deformation of end face A and the low point of outer diameter deformation of end face A is equal to 90°. The high point of outer diameter deformation of end face A corresponds to the high point of outer diameter deformation of end face B. The low point of outer diameter deformation of end face A corresponds to the low point of outer diameter deformation of end face B. The diameter variation S A and diameter variation S B When the difference between them is between 0.5 mm and 1.0 mm, S400 is started;

[0011] S300: For the side where the diameter variation is greater than the standard deformation threshold, the tooling is shifted 20 to 30 degrees from the low point of outer diameter deformation to the side away from the high point of deformation, and the tooling is started to be applied so that the low point of outer diameter deformation becomes the high point of outer diameter deformation through the force applied to the tooling;

[0012] After shaping, it is heated and kept warm in a tempering furnace;

[0013] S400, a push-up tool is installed at the inner diameter corresponding to the midpoint of the line connecting the lowest point of the outer diameter deformation of the end face A and the lowest point of the outer diameter deformation of the end face B, so that the tool is subjected to force so that the lowest point of the outer diameter deformation becomes the highest point of the outer diameter deformation;

[0014] After shaping, it is heated and kept warm in a tempering furnace.

[0015] Furthermore, when the outer ring of the single-row tapered roller bearing is made of martensitic high-carbon chromium bearing steel, the diameter change Y after top forming in step S300 satisfies:

[0016] Y=(1.5~2.0)X+(0~0.5mm)

[0017] The top forming is ended when X is the diameter change before the top forming.

[0018] Furthermore, when the outer ring of the single-row tapered roller bearing is made of bainite high-carbon chromium bearing steel, the diameter change Y after top forming in step S300 satisfies:

[0019] Y=(1.8~2.0)X+(0~0.5mm)

[0020] The top forming is ended when X is the diameter change before the top forming.

[0021] Furthermore, when the outer ring of the single-row tapered roller bearing is made of martensitic high-carbon chromium bearing steel, the diameter change Y after top forming in step S400 satisfies:

[0022] Y=(1.5~2.2)X+(0~0.5mm)

[0023] The top forming is ended when X is the diameter change before the top forming.

[0024] Furthermore, when the outer ring of the single-row tapered roller bearing is made of bainite high-carbon chromium bearing steel, the diameter change Y after top forming in step S400 satisfies:

[0025] Y=(1.8~2.4)X+(0~0.5mm)

[0026] The top forming is ended when X is the diameter change before the top forming.

[0027] Furthermore, measuring the diameter variation of the outer diameter of the outer ring of the single-row tapered roller bearing includes: using a measuring tube ruler to rotate along the circumferential direction of the outer ring of the single-row tapered roller bearing, determining the low point and high point of the ring by the number of rotations of the pointer of the dial indicator, and determining the diameter variation.

[0028] Furthermore, when measuring the outer diameter of the outer ring of a single-row tapered roller bearing, the measuring position is 10 mm away from the end face.

[0029] Furthermore, the measuring ruler includes a ruler body, an abutment assembly slidably fixed to the ruler body, and a measuring scale assembly slidably fixed to the ruler body.

[0030] Furthermore, when the outer ring of the single-row tapered roller bearing is made of martensitic high-carbon chromium bearing steel, the shaping and tempering temperature of the tempering furnace for heating and holding in step S300 is 180° C. to 200° C., and the shaping and tempering time is 10 hours to 15 hours;

[0031] When the outer ring of the single-row tapered roller bearing is made of bainite high-carbon chromium bearing steel, the shaping and tempering temperature of the tempering furnace for heating and heat preservation in step S300 is 250°C to 270°C, and the shaping and tempering time is 10h to 15h.

[0032] Furthermore, when the outer ring of the single-row tapered roller bearing is made of martensitic high-carbon chromium bearing steel, the shaping and tempering temperature of the tempering furnace for heating and holding in step S400 is 180° C. to 200° C., and the shaping and tempering time is 10 hours to 15 hours;

[0033] When the outer ring of the single-row tapered roller bearing is made of bainite high-carbon chromium bearing steel, the shaping and tempering temperature of the tempering furnace for heating and heat preservation in step S400 is 250°C to 270°C, and the shaping and tempering time is 10h to 15h.

[0034] The beneficial effects of the present invention are as follows: the shaping position and the degree of top shaping are strictly controlled according to the diameter variation and the positions of the high and low points of the end faces on both sides of the outer ring of the single-row tapered roller bearing, and a large reshaping amount is used to ensure that the diameter variation after shaping is within the tolerance range. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Schematic diagram of the structure of the outer diameter deformation high point and the outer diameter deformation low point of the outer ring of a single-row tapered roller bearing in one embodiment of the present invention;

[0036] Figure 2 Schematic diagram of the structure of the outer diameter deformation high point and the outer diameter deformation low point of the single-row tapered roller bearing outer ring in another embodiment of the present invention;

[0037] Figure 3 This is a schematic structural diagram of a top-type tooling for mounting the outer ring of a single-row tapered roller bearing in one embodiment of the present invention;

[0038] Figure 4 Schematic diagram of the structure of measuring the outer ring of a single-row tapered roller bearing in one embodiment of the present invention;

[0039] Figure 5 This is a table of allowable variations in the outer diameter of a ferrule in one embodiment of the present invention;

[0040] Figure 6 This is the integer parameter table of Example 1 to Example 4;

[0041] In the figure: a1, the outer diameter deformation of the A end face is high, a2, the outer diameter deformation of the A end face is low, b1, the outer diameter deformation of the B end face is high, b2, the outer diameter deformation of the B end face is low,

[0042] 10. Top tooling, 20. Measuring pipe ruler, 21. Pipe ruler body, 22. Abutment assembly, 23. Measuring table assembly. DETAILED DESCRIPTION

[0043] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0044] See also Figures 1-4 A shaping process for the outer ring of a single-row tapered roller bearing is described. This process is applied to the outer ring of single-row tapered roller bearings with a width height of less than 200 mm and is suitable for both martensitic high-carbon chromium bearing steel and bainitic high-carbon chromium bearing steel. The outer ring of a single-row tapered roller bearing has an A end face and a B end face. The shaping process includes the following steps:

[0045] Step S100: Measure the outer diameter of the outer ring of the single-row tapered roller bearing near the A end face, and mark the high point a1 and the low point a2 of the outer diameter deformation of the A end face to obtain the diameter variation S. A ;

[0046] Measure the outer diameter of the outer ring of the single-row tapered roller bearing near the B end face, and mark the high point b1 and the low point b2 of the outer diameter deformation of the B end face to obtain the diameter variation S. B .

[0047] In one embodiment, see Figure 1 Measuring the diameter variation of the outer diameter of the single-row tapered roller bearing outer ring in step S100 includes rotating a measuring ruler 20 along the circumference of the single-row tapered roller bearing outer ring, determining the lowest and highest points of the ring by the number of revolutions of the dial indicator pointer, and determining the diameter variation. The measuring ruler 20 is used to measure the outer diameters near both end faces.

[0048] In one embodiment, the measuring ruler 20 includes a ruler body 21 , an abutment assembly 22 slidably fixed to the ruler body 21 , and a measuring dial assembly 23 slidably fixed to the ruler body 21 .

[0049] Step S200, see Figure 1 and Figure 4 , such as diameter variation S A and diameter variation S B One of them is greater than the standard deformation threshold, and the angle between the high point of the outer diameter deformation of the A end face and the low point of the outer diameter deformation of the A end face is less than 90° ( Figure 1 The m in the figure is less than 90°), the high point of the outer diameter deformation of the end face A corresponds to the high point of the outer diameter deformation of the end face B, the low point of the outer diameter deformation of the end face A corresponds to the low point of the outer diameter deformation of the end face B, and the diameter change S A and diameter variation S B When the difference between the two is between 0.5 mm and 1.0 mm, step S300 is started.

[0050] See also Figure 2 and Figure 4 , such as diameter variation S A and diameter variation S B are greater than the standard deformation threshold, and the angle between the high point of the outer diameter deformation of the A end face and the low point of the outer diameter deformation of the A end face is equal to 90° ( Figure 2 The m in the figure is equal to 90°), the high point of the outer diameter deformation of the end face A corresponds to the high point of the outer diameter deformation of the end face B, the low point of the outer diameter deformation of the end face A corresponds to the low point of the outer diameter deformation of the end face B, and the diameter change S A and diameter variation S B When the difference between the two is between 0.5 mm and 1.0 mm, step S400 is started.

[0051] The correspondence between the high and low points of the outer diameter deformation of the two end faces means that the high point a1 of the outer diameter deformation of end face A corresponds to the high point b1 of the outer diameter deformation of end face B, and the low point a2 of the outer diameter deformation of end face A corresponds to the low point b2 of the outer diameter deformation of end face B. Whether they correspond is determined by determining whether the axial projection of the high point a1 of the outer diameter deformation of end face A on the plane where end face B is located coincides with the high point b1 of the outer diameter deformation of end face B. Similarly, whether the axial projection of the low point a2 of the outer diameter deformation of end face A on the plane where end face B is located coincides with the low point b2 of the outer diameter deformation of end face B. If they coincide, they correspond; if they do not coincide, they do not correspond.

[0052] It should be noted that the standard deformation threshold is determined according to the national standard JB / T1255-2014 version, or is specified based on the national standard. In this embodiment, the standard deformation threshold can be Figure 5 The table in is read out.

[0053] See also Figure 3 Step S300: For the side where the diameter variation is greater than the standard deformation threshold, the outer diameter deformation low point is shifted 20 to 30 degrees (n shown in the figure) away from the deformation high point, and the ejecting tool 10 is started. The ejecting tool 10 is applied with force so that the outer diameter deformation low point becomes the outer diameter deformation high point.

[0054] After shaping, it is heated and kept warm in a tempering furnace;

[0055] Step S400: Place a push-up tool 10 at the inner diameter corresponding to the midpoint of the line connecting the lowest point of outer diameter deformation of end face A and the lowest point of outer diameter deformation of end face B, so that the push-up tool 10 is subjected to force to turn the lowest point of outer diameter deformation into the highest point of outer diameter deformation;

[0056] After shaping, it is heated and kept warm in a tempering furnace.

[0057] The above-mentioned single-row tapered roller bearing outer ring shaping process strictly controls the shaping position and the degree of top shaping based on the diameter variation of the end faces on both sides of the single-row tapered roller bearing outer ring and the corresponding relationship between the high point and the low point, avoids redundant measurement steps, and uses a large anti-shaping amount to ensure that the diameter variation after shaping is within the tolerance range.

[0058] Furthermore, when the outer ring of the single-row tapered roller bearing is made of martensitic high-carbon chromium bearing steel, the diameter change Y after top forming in step S300 satisfies:

[0059] Y=(1.5~2.0)X+(0~0.5mm)

[0060] The top forming is ended when X is the diameter change before the top forming.

[0061] Furthermore, when the outer ring of the single-row tapered roller bearing is made of bainite high-carbon chromium bearing steel, the diameter change Y after top forming in step S300 satisfies:

[0062] Y=(1.8~2.0)X+(0~0.5mm)

[0063] The top forming is ended when X is the diameter change before the top forming.

[0064] Furthermore, when the outer ring of the single-row tapered roller bearing is made of martensitic high-carbon chromium bearing steel, the diameter change Y after top forming in step S400 satisfies:

[0065] Y=(1.5~2.2)X+(0~0.5mm)

[0066] The top forming is ended when X is the diameter change before the top forming.

[0067] In one embodiment, when the outer ring of the single-row tapered roller bearing is made of bainite high-carbon chromium bearing steel, the diameter change Y after top forming in step S400 satisfies:

[0068] Y=(1.8~2.4)X+(0~0.5mm)

[0069] The top forming is ended when X is the diameter change before the top forming.

[0070] The above-mentioned single-row tapered roller bearing outer ring shaping process determines the corresponding top shape formulas for martensitic high-carbon chromium bearing steel and bainitic high-carbon chromium bearing steel according to the organizational structure type. The allowable range of the corresponding diameter change Y after shaping can be calculated based on the top shape formula, so that different types of single-row tapered roller bearing outer rings can be shaped more specifically, further optimizing the shaping effect.

[0071] In one embodiment, when measuring the outer diameter of the outer ring of a single-row tapered roller bearing, the measuring position is 10 mm away from the end face.

[0072] See also Figure 1Specifically, the top forming tool 10 is a screw top support. When performing the top forming operation, the top forming tool 10 is installed to the determined position L of the top forming tool 10, that is, the axis of the top forming tool 10 coincides with the position L of the top forming tool, and the nut on the screw top support is adjusted to perform the top forming. After the top forming is completed, the screw top support is not removed, and the deformation Y after the top forming is measured again using the measuring tube ruler 20. If the deformation Y after the top forming does not meet the top forming formula, the nut is continued to be adjusted for top forming until the deformation Y meets the top forming formula. During the specific operation, the range of the diameter change Y after the top forming can be calculated according to the top forming formula. When the diameter change Y measured after the top forming falls within the range, it is considered that the low point of the outer diameter deformation is changed to the high point of the outer diameter deformation due to the force applied to the tool.

[0073] Preferably, in one embodiment, when the outer ring of the single-row tapered roller bearing is made of martensitic high-carbon chromium bearing steel, the shaping and tempering temperature of the tempering furnace for heating and holding in step S300 is 180° C. to 200° C., and the shaping and tempering time is 10 hours to 15 hours;

[0074] When the outer ring of the single-row tapered roller bearing is made of bainitic high-carbon chromium bearing steel, the shaping and tempering temperature of the tempering furnace for heating and holding in step S300 is 250°C to 270°C, and the shaping and tempering time is 10h to 15h.

[0075] Preferably, in one embodiment, when the outer ring of the single-row tapered roller bearing is made of martensitic high-carbon chromium bearing steel, the shaping and tempering temperature of the tempering furnace for heating and holding in step S400 is 180° C. to 200° C., and the shaping and tempering time is 10 hours to 15 hours;

[0076] When the outer ring of the single-row tapered roller bearing is made of bainitic high-carbon chromium bearing steel, the shaping and tempering temperature of the tempering furnace for heating and holding in step S400 is 250°C to 270°C, and the shaping and tempering time is 10h to 15h.

[0077] It should be noted that, during specific measurements, the measurement can be performed at a distance of 10 mm from the A end face. Similarly, the measurement can be performed at a distance of 10 mm from the B end face.

[0078] See also Figure 6 In Example 1, a shaping process for the outer ring of a single-row tapered roller bearing is applied to an outer ring of a single-row tapered roller bearing with a width of 102 mm and a diameter of 1760 mm. The outer ring is made of high-carbon chromium bearing steel with a bainite structure. Based on the dimensions and type of the outer ring of the single-row tapered roller bearing, the corresponding standard deformation threshold is 2.08 mm. The outer ring of the single-row tapered roller bearing has an A end face and a B end face. The specific steps of the shaping process include:

[0079] Step S100: Measure the outer diameter of the outer ring of the single-row tapered roller bearing near end face A, and mark the high point a1 and the low point a2 of the outer diameter deformation of end face A, obtaining a diameter variation of 2.7 mm.

[0080] Measure the outer diameter of the outer ring of the single-row tapered roller bearing near the B end face, mark the high point b1 and the low point b2 of the outer diameter deformation of the B end face, and obtain a diameter change of 1.9 mm.

[0081] Only one side is larger than the standard deformation threshold of 2.08mm, and the angle between the high point of the outer diameter deformation of the A end face and the low point of the outer diameter deformation of the A end face is less than 90° ( Figure 1 m is less than 90°), non-cross, the high point of the outer diameter deformation of the A end face corresponds to the high point of the outer diameter deformation of the B end face, the low point of the outer diameter deformation of the A end face corresponds to the low point of the outer diameter deformation of the B end face, and the diameter change S A and diameter variation S B When the difference between the two is between 0.5 mm and 1.0 mm, step S300 is started.

[0082] See also Figure 3 Step S300: For the side where the diameter variation is greater than the standard deformation threshold, the outer diameter deformation low point is shifted 25 degrees (n shown in the figure) away from the deformation high point, and the ejecting tool 10 is started. The ejecting tool 10 is applied with force so that the outer diameter deformation low point becomes the outer diameter deformation high point.

[0083] After shaping, it is heated and kept warm in a tempering furnace;

[0084] The diameter change Y after top forming is 5.1mm.

[0085] Y=top profile magnification 1.89*2.7mm=5.1mm, which satisfies the top profile formula in step S300 when the outer ring of the single-row tapered roller bearing is made of bainitic high-carbon chromium bearing steel.

[0086] The diameter change was measured after tempering, which was 0.9 mm on the side close to end face A and 0.7 mm on the side close to end face B, both of which were less than the standard deformation threshold and qualified.

[0087] See also Figure 6 In Example 2, a shaping process for the outer ring of a single-row tapered roller bearing is applied to an outer ring of a single-row tapered roller bearing with a width of 88 mm and a diameter of 1350 mm. The outer ring is made of high-carbon chromium bearing steel with a martensitic structure. Based on the size and type of the outer ring of the single-row tapered roller bearing, the corresponding standard deformation threshold is 1.6 mm. The outer ring of the single-row tapered roller bearing has an A end face and a B end face. The specific steps of the shaping process include:

[0088] Step S100: Measure the outer diameter of the outer ring of the single-row tapered roller bearing near end face A, and mark the high point a1 and the low point a2 of the outer diameter deformation of end face A, obtaining a diameter variation of 3.6 mm.

[0089] Measure the outer diameter of the outer ring of the single-row tapered roller bearing near the B end face, mark the high point b1 and the low point b2 of the outer diameter deformation of the B end face, and obtain a diameter change of 2.9 mm.

[0090] The diameter changes near end face A and end face B are both greater than the standard deformation threshold, and the angle between the high point of outer diameter deformation of end face A and the low point of outer diameter deformation of end face A is equal to 90° ( Figure 1 The m in the figure is equal to 90°), forming a cross, the high point of the outer diameter deformation of the end face A corresponds to the high point of the outer diameter deformation of the end face B, the low point of the outer diameter deformation of the end face A corresponds to the low point of the outer diameter deformation of the end face B, and the diameter change S A and diameter variation S B When the difference between the two is between 0.5 mm and 1.0 mm, step S400 is started.

[0091] Step S400: Place a push-up tool 10 at the inner diameter corresponding to the midpoint of the line connecting the lowest point of outer diameter deformation of end face A and the lowest point of outer diameter deformation of end face B, so that the push-up tool 10 is subjected to force to turn the lowest point of outer diameter deformation into the highest point of outer diameter deformation;

[0092] After shaping, it is heated and kept warm in a tempering furnace.

[0093] The diameter change Y after top forming is 5.5mm.

[0094] For the A end face, Y=top type magnification 1.53*3.6mm=5.5mm,

[0095] For the B end face, Y=top type magnification 1.9*2.9mm=5.5mm,

[0096] When the outer ring of the single-row tapered roller bearing is made of bainite high-carbon chromium bearing steel, the top shape formula in step S400 is satisfied.

[0097] The diameter change was measured after tempering, which was 0.9mm on the side close to end face A and 0.7mm on the side close to end face B, both of which were less than the standard deformation threshold of 1.6mm and qualified.

[0098] In Example 3, a shaping process for the outer ring of a single-row tapered roller bearing is applied to the outer ring of a single-row tapered roller bearing with a width of 88 mm and a diameter of 1350 mm. The outer ring is made of high-carbon chromium bearing steel with a martensitic structure. Based on the size specifications and type of the outer ring of the single-row tapered roller bearing, the corresponding standard deformation threshold is 1.6 mm. The outer ring of the single-row tapered roller bearing has an A end face and a B end face. The specific steps of the shaping process include:

[0099] Step S100: Measure the outer diameter of the outer ring of the single-row tapered roller bearing near end face A, and mark the high point a1 and the low point a2 of the outer diameter deformation of end face A, obtaining a diameter variation of 2.2 mm.

[0100] Measure the outer diameter of the outer ring of the single-row tapered roller bearing near the B end face, and mark the high point b1 and the low point b2 of the outer diameter deformation of the B end face, and obtain a diameter change of 1.5 mm.

[0101] Only one side is larger than the standard deformation threshold of 1.6mm, and the angle between the high point of the outer diameter deformation of the A end face and the low point of the outer diameter deformation of the A end face is less than 90° ( Figure 1 m is less than 90°), non-cross, the high point of the outer diameter deformation of the A end face corresponds to the high point of the outer diameter deformation of the B end face, the low point of the outer diameter deformation of the A end face corresponds to the low point of the outer diameter deformation of the B end face, and the diameter change S A and diameter variation S B When the difference between the two is between 0.5 mm and 1.0 mm, step S300 is started.

[0102] See also Figure 3 Step S300: For the side where the diameter variation is greater than the standard deformation threshold, the outer diameter deformation low point is shifted 20 degrees (n shown in the figure) away from the deformation high point, and the ejecting tool 10 is started. The ejecting tool 10 is applied with force so that the outer diameter deformation low point becomes the outer diameter deformation high point.

[0103] After shaping, it is heated and kept warm in a tempering furnace;

[0104] The diameter change Y after top forming is 3.9mm.

[0105] Y=top profile ratio 1.77*2.2mm =3.9mm, which satisfies the top profile formula in step S300 when the outer ring of the single-row tapered roller bearing is made of martensitic high-carbon chromium bearing steel.

[0106] The diameter change was measured after tempering, which was 0.7mm on the side close to end face A and 0.6mm on the side close to end face B, both of which were less than the standard deformation threshold and qualified.

[0107] In Example 4, a shaping process for the outer ring of a single-row tapered roller bearing is applied to the outer ring of a single-row tapered roller bearing with a width of 102 mm and a diameter of 1760 mm. The outer ring is made of high-carbon chromium bearing steel with a bainite structure. Based on the size specifications and type of the outer ring of the single-row tapered roller bearing, the corresponding standard deformation threshold is 2.08 mm. The outer ring of the single-row tapered roller bearing has an A end face and a B end face. The specific steps of the shaping process include:

[0108] Step S100: Measure the outer diameter of the outer ring of the single-row tapered roller bearing near end face A, and mark the high point a1 and the low point a2 of the outer diameter deformation of end face A, obtaining a diameter variation of 3.8 mm.

[0109] Measure the outer diameter of the outer ring of the single-row tapered roller bearing near the B end face, mark the high point b1 and the low point b2 of the outer diameter deformation of the B end face, and obtain a diameter change of 3.1 mm.

[0110] The diameter changes near end face A and end face B are both greater than the standard deformation threshold, and the angle between the high point of outer diameter deformation of end face A and the low point of outer diameter deformation of end face A is equal to 90° ( Figure 1 The m in the figure is equal to 90°), forming a cross, the high point of the outer diameter deformation of the end face A corresponds to the high point of the outer diameter deformation of the end face B, the low point of the outer diameter deformation of the end face A corresponds to the low point of the outer diameter deformation of the end face B, and the diameter change S A and diameter variation S B When the difference between the two is between 0.5 mm and 1.0 mm, step S400 is started.

[0111] Step S400: Place a push-up tool 10 at the inner diameter corresponding to the midpoint of the line connecting the lowest point of outer diameter deformation of end face A and the lowest point of outer diameter deformation of end face B, so that the push-up tool 10 is subjected to force to turn the lowest point of outer diameter deformation into the highest point of outer diameter deformation;

[0112] After shaping, it is heated and kept warm in a tempering furnace.

[0113] The diameter change Y after top forming is 7.2mm.

[0114] For the A end face, Y=top profile ratio 1.89*3.8=7.2mm,

[0115] For the B end face, Y = top profile ratio 2.32 * 3.1mm = 7.2mm,

[0116] When the outer ring of the single-row tapered roller bearing is made of bainite high-carbon chromium bearing steel, the top shape formula in step S400 is satisfied.

[0117] The diameter change was measured after tempering, which was 1.4mm on the side close to end face A and 1.1mm on the side close to end face B, both of which were less than the standard deformation threshold of 2.08mm and qualified.

[0118] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0119] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0120] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0121] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher horizontal height than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower horizontal height than the second feature. It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can be an intermediate element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there can be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

Claims

1. A process for shaping the outer ring of a single-row tapered roller bearing, wherein the outer ring of the single-row tapered roller bearing has an A end face and a B end face, characterized in that: The specific steps include S100, measure the outer diameter of the outer ring of the single-row tapered roller bearing close to the A end face, and mark the high point of the outer diameter deformation of the A end face and the low point of the outer diameter deformation of the A end face to obtain the diameter variation S A ; Measure the outer diameter of the outer ring of the single-row tapered roller bearing near the B end face, and mark the high point and low point of the outer diameter deformation of the B end face to obtain the diameter variation S B ; S200、 Such as diameter change S A and diameter variation S B One of them is greater than the standard deformation threshold, the angle between the high point of outer diameter deformation of end face A and the low point of outer diameter deformation of end face A is less than 90°, the high point of outer diameter deformation of end face A corresponds to the high point of outer diameter deformation of end face B, the low point of outer diameter deformation of end face A corresponds to the low point of outer diameter deformation of end face B, and the diameter change S A and diameter variation S B When the difference between them is between 0.5 mm and 1.0 mm, S300 is started; Such as diameter change S A and diameter variation S B The angle between the high point of outer diameter deformation of end face A and the low point of outer diameter deformation of end face A is equal to 90°. The high point of outer diameter deformation of end face A corresponds to the high point of outer diameter deformation of end face B. The low point of outer diameter deformation of end face A corresponds to the low point of outer diameter deformation of end face B. The diameter variation S A and diameter variation S B When the difference between them is between 0.5 mm and 1.0 mm, S400 is started; S300: For the side where the diameter variation is greater than the standard deformation threshold, the tooling is shifted 20 to 30 degrees from the low point of outer diameter deformation to the side away from the high point of deformation, and the tooling is started to be applied so that the low point of outer diameter deformation becomes the high point of outer diameter deformation through the force applied to the tooling; After shaping, it is heated and kept warm in a tempering furnace; S400, a push-up tool is installed at the inner diameter corresponding to the midpoint of the line connecting the lowest point of the outer diameter deformation of the end face A and the lowest point of the outer diameter deformation of the end face B, so that the tool is subjected to force so that the lowest point of the outer diameter deformation becomes the highest point of the outer diameter deformation; After shaping, it is heated and kept warm in a tempering furnace.

2. The outer ring shaping process of a single-row tapered roller bearing according to claim 1, characterized in that: When the outer ring of the single-row tapered roller bearing is made of martensitic high-carbon chromium bearing steel, the diameter change Y after top forming in step S300 satisfies: Y=(1.5~2.0)X+(0~0.5mm) The top forming is ended when X is the diameter change before the top forming.

3. The outer ring shaping process of a single-row tapered roller bearing according to claim 1, characterized in that: When the outer ring of the single-row tapered roller bearing is made of bainite high-carbon chromium bearing steel, the diameter change Y after top forming in step S300 satisfies: Y=(1.8~2.0)X+(0~0.5mm) The top forming is ended when X is the diameter change before the top forming.

4. The outer ring shaping process of a single-row tapered roller bearing according to claim 1, characterized in that: When the outer ring of the single-row tapered roller bearing is made of martensitic high-carbon chromium bearing steel, the diameter change Y after top forming in step S400 satisfies: Y=(1.5~2.2)X+(0~0.5mm) The top forming is ended when X is the diameter change before the top forming.

5. The outer ring shaping process of a single-row tapered roller bearing according to claim 1, characterized in that: When the outer ring of the single-row tapered roller bearing is made of bainite high-carbon chromium bearing steel, the diameter change Y after top forming in step S400 satisfies: Y=(1.8~2.4)X+(0~0.5mm) The top forming is ended when X is the diameter change before the top forming.

6. The outer ring shaping process of a single-row tapered roller bearing according to claim 1, characterized in that: Measuring the diameter variation of the outer diameter of the single-row tapered roller bearing outer ring includes: using a measuring tube ruler to rotate along the circumferential direction of the single-row tapered roller bearing outer ring, determining the low point and high point of the ring by the number of revolutions of the dial indicator pointer, and determining the diameter variation.

7. The process for shaping the outer ring of a single-row tapered roller bearing according to claim 6, characterized in that: When measuring the outer diameter of the outer ring of a single-row tapered roller bearing, the measuring position should be 10 mm from the end face.

8. The process for shaping the outer ring of a single-row tapered roller bearing according to claim 6, characterized in that: The measuring ruler includes a ruler body, an abutment assembly slidably fixed to the ruler body, and a measuring table assembly slidably fixed to the ruler body.

9. The process for shaping the outer ring of a single-row tapered roller bearing according to claim 1, characterized in that: When the outer ring of the single-row tapered roller bearing is made of martensitic high-carbon chromium bearing steel, the shaping and tempering temperature of the tempering furnace for heating and holding in step S300 is 180°C to 200°C, and the shaping and tempering time is 10h to 15h; When the outer ring of the single-row tapered roller bearing is made of bainite high-carbon chromium bearing steel, the shaping and tempering temperature of the tempering furnace for heating and heat preservation in step S300 is 250°C to 270°C, and the shaping and tempering time is 10h to 15h.

10. The process for shaping the outer ring of a single-row tapered roller bearing according to claim 1, characterized in that: When the outer ring of the single-row tapered roller bearing is made of martensitic high-carbon chromium bearing steel, the shaping and tempering temperature of the tempering furnace for heating and holding in step S400 is 180° C. to 200° C., and the shaping and tempering time is 10 hours to 15 hours; When the outer ring of the single-row tapered roller bearing is made of bainite high-carbon chromium bearing steel, the shaping and tempering temperature of the tempering furnace for heating and heat preservation in step S400 is 250°C to 270°C, and the shaping and tempering time is 10h to 15h.

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