Single-row tapered roller bearing outer ring shaping process

Abstract

The invention relates to the technical field of bearing ring shaping, in particular to a single-row tapered roller bearing outer ring shaping process. Measuring the outer diameter of the outer ring of the single-row tapered roller bearing close to the A end face, and marking the high deformation point of the outer diameter of the A end face and the low deformation point of the outer diameter of the A end face to obtain the diameter variation; measuring the outer diameter of the outer ring of the single-row tapered roller bearing close to the B end face, and marking the high deformation point of the outer diameter of the B end face and the low deformation point of the outer diameter of the B end face to obtain the diameter variation; the top type position is determined, a top type tool is started to be lifted, and the outer diameter deformation low point is changed into the outer diameter deformation high point through tool stress; and after shaping is finished, heating and heat preservation are conducted through a tempering furnace. A reasonable top form formula is determined according to the diameter variation of the end faces on the two sides of the outer ring of the single-row tapered roller bearing, the shaping position and the top form degree are strictly controlled, and it is guaranteed that the diameter variation after shaping is within the allowance range through the large inversion amount.

Description

Technical Field

[0001] The 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 organizational structures in metal materials. The structure of bainite is a composite of needle-shaped or plate-shaped austenite grains and fine and planar carbides. Martensite, on the other hand, is a group 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 will also be different. Martensite is harder than bainite, while bainite is tougher than martensite. Generally, bainite is the main material organizational structure in mechanical equipment that requires high toughness, such as bearings, while martensite is more suitable in other scenarios that require high hardness.

[0003] Therefore, according to different application scenarios, some single-row tapered roller bearings use martensite for their outer rings, while others use bainite. Single-row tapered roller bearings 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 change of the end faces on both sides of the outer ring of the single-row tapered roller bearing, and adopts a large reverse shaping amount to ensure that the diameter change 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: 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 A end face outer diameter deformation and the low point of the A end face outer diameter deformation to obtain the diameter change S A ; Measure the outer diameter of the outer ring of the single-row tapered roller bearing close to the B end face, and mark the high point of the outer diameter deformation of the B end face and the low point of the outer diameter deformation of the B end face to obtain the diameter change S B ; S200, The diameter change S A And diameter variation S BOne of them is greater than the standard deformation threshold, the angle between the high point of the outer diameter deformation of end face A and the low point of the outer diameter deformation of end face A is less than 90°, the high point of the outer diameter deformation of end face A corresponds to the high point of the outer diameter deformation of end face B, the low point of the outer diameter deformation of end face A corresponds to the low point of the 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; The diameter change S A And diameter variation S B The angle between the high point of the outer diameter deformation of end face A and the low point of the outer diameter deformation of end face A is equal to 90°, the high point of the outer diameter deformation of end face A corresponds to the high point of the outer diameter deformation of end face B, the low point of the outer diameter deformation of end face A corresponds to the low point of the 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, S400 is started; 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 away from the deformation high point, and the top-type tooling is started, so that the outer diameter deformation low point becomes the outer diameter deformation high point through the tooling force; After shaping, it is heated and kept warm in a tempering furnace; S400, a top-type tool is installed at the inner diameter corresponding to the midpoint of the line connecting the low point of the outer diameter deformation of the A end face and the low point of the outer diameter deformation of the B end face, and the force applied to the tool causes the low point of the outer diameter deformation to become the high point of the outer diameter deformation; After shaping, it is heated and kept warm in a tempering furnace.

[0006] Further, 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.

[0007] Further, 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.

[0008] Further, 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.

[0009] Further, 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.

[0010] 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 through the number of rotations of the pointer of the dial indicator, and determining the diameter variation.

[0011] Furthermore, when measuring the outer diameter of the outer ring of the single-row tapered roller bearing, the measuring position is 10 mm away from the end face.

[0012] Furthermore, 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.

[0013] 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 heat preservation 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 bainitic 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.

[0014] 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 heat preservation in step S400 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 S400 is 250°C to 270°C, and the shaping and tempering time is 10h to 15h.

[0015] 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 of the end faces on both sides of the outer ring of the single-row tapered roller bearing and the positions of the high and low points, and a large amount of reverse shaping is used to ensure that the diameter variation after shaping is within the tolerance range. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a structural schematic diagram 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; Figure 2 It is a structural schematic diagram 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 another embodiment of the present invention; Figure 3 It is a structural schematic diagram of a top-type tooling for installing the outer ring of a single-row tapered roller bearing in one embodiment of the present invention; Figure 4 It is a structural schematic diagram of measuring the outer ring of a single-row tapered roller bearing in one embodiment of the present invention; Figure 5 A table showing the allowable variation of the outer diameter of the ferrule in one embodiment of the present invention; Figure 6 is an integer parameter table of Embodiment 1 to Embodiment 4; In the figure: a1, the deformation point of the outer diameter of the A end surface is high, a2, the deformation point of the outer diameter of the A end surface is low, b1, the deformation point of the outer diameter of the B end surface is high, b2, the deformation point of the outer diameter of the B end surface is low, 10. Top tooling, 20. Measuring pipe ruler, 21. Pipe ruler body, 22. Abutment assembly, 23. Measuring table assembly. DETAILED DESCRIPTION

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0018] See also Figure 1-Figure 4 , a single-row tapered roller bearing outer ring shaping process, applied to the outer ring of a single-row tapered roller bearing with a width height of less than 200 mm, and can be applicable to high-carbon chromium bearing steel with martensite structure and high-carbon chromium bearing steel with bainite structure. 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: Step 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 a1 of the outer diameter deformation of the A end face and the low point a2 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 close to 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 change S B .

[0019] In one embodiment, see Figure 1In step S100, measuring the diameter variation of the outer diameter of the outer ring of the single-row tapered roller bearing includes: using a measuring ruler 20 to rotate along the circumferential direction of the outer ring of the single-row tapered roller bearing, determining the low point and the high point of the ring by the number of revolutions of the pointer of the dial indicator, and determining the diameter variation. Using the measuring ruler 20 to detect the outer diameters close to the two end faces respectively.

[0020] 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 gauge assembly 23 slidably fixed to the ruler body 21 .

[0021] Step S200, see Figure 1 and Figure 4 , such as diameter change 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 m is less than 90°), 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 values ​​is between 0.5 mm and 1.0 mm, step S300 is started.

[0022] See also Figure 2 and Figure 4 , such as diameter change 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 m in the figure is equal to 90°), 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 values ​​is between 0.5 mm and 1.0 mm, step S400 is started.

[0023] Among them, the correspondence between the high point and the low point of the outer diameter deformation of the two end faces means that the high point a1 of the outer diameter deformation of the A end face corresponds to the high point b1 of the outer diameter deformation of the B end face, and the low point a2 of the outer diameter deformation of the A end face corresponds to the low point b2 of the outer diameter deformation of the B end face. Whether it corresponds is to determine whether the projection of the high point a1 of the outer diameter deformation of the A end face along the axial direction on the plane where the B end face is located coincides with the high point b1 of the outer diameter deformation of the B end face. Similarly, determine whether the projection of the low point a2 of the outer diameter deformation of the A end face along the axial direction on the plane where the B end face is located coincides with the low point b2 of the outer diameter deformation of the B end face. If they coincide, they correspond, and if they do not coincide, they do not correspond.

[0024] 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. Figure 5 Read out the table in .

[0025] See also Figure 3 , step S300, for the side where the diameter variation is greater than the standard deformation amount threshold, shift 20 degrees to 30 degrees (n shown in the figure) from the low point of outer diameter deformation to the side away from the high point of deformation, and start to put on the ejector 10, so that the low point of outer diameter deformation becomes the high point of outer diameter deformation through the force of the ejector 10; After shaping, it is heated and kept warm in a tempering furnace; Step S400, placing a push-up tooling 10 at the inner diameter corresponding to the midpoint of the line connecting the outer diameter deformation low point of the A end face and the outer diameter deformation low point of the B end face, and applying force to the push-up tooling 10 to turn the outer diameter deformation low point into the outer diameter deformation high point; After shaping, it is heated and kept warm in a tempering furnace.

[0026] The above-mentioned single-row tapered roller bearing outer ring shaping process strictly controls the shaping position and the degree of top shaping according to the diameter change of the end faces on both sides of the single-row tapered roller bearing outer ring and the corresponding relationship between the positions of the high point and the low point, avoids redundant measurement steps, and uses a large anti-shaping amount to ensure that the diameter change after shaping is within the tolerance range.

[0027] Further, 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.

[0028] Further, 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.

[0029] Further, 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.

[0030] 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: Y=(1.8~2.4)X+(0~0.5mm) The top forming is ended when X is the diameter change before the top forming.

[0031] The above-mentioned single-row tapered roller bearing outer ring shaping process determines the top shape formula corresponding to 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 according to the top shape formula, and the outer rings of different types of single-row tapered roller bearings can be shaped more specifically to further optimize the shaping effect.

[0032] 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.

[0033] See also Figure 1 Specifically, 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 top forming. After the top forming is completed, the screw top support is not removed, and the deformation amount Y after top forming is measured again using the measuring tube ruler 20. If the deformation amount Y after top forming does not satisfy the top forming formula, the nut is continued to be adjusted for top forming until the deformation amount Y satisfies the top forming formula. During the specific operation, the range of the diameter change amount Y after top forming can be calculated according to the top forming formula. When the diameter change amount Y measured after 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 through the tooling force.

[0034] Preferably, in one embodiment, when the outer ring of the single-row tapered roller bearing is martensitic high-carbon chromium bearing steel, the shaping and tempering temperature of the tempering furnace for heating and heat preservation 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.

[0035] Preferably, in one embodiment, when the outer ring of the single-row tapered roller bearing is martensitic high-carbon chromium bearing steel, the shaping and tempering temperature of the tempering furnace for heating and heat preservation in step S400 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 S400 is 250°C to 270°C, and the shaping and tempering time is 10h to 15h.

[0036] It should be noted that, during specific measurement, the measurement can be performed at a distance of 10 mm from the A end surface. Similarly, the measurement can be performed at a distance of 10 mm from the B end surface.

[0037] See also Figure 6 In Example 1, 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 height of 102 mm and a diameter of 1760 mm, which is a high-carbon chromium bearing steel with a bainite structure. According to the size specifications and type of the outer ring of the single-row tapered roller bearing, the corresponding standard deformation threshold is obtained to be 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: Step S100, measuring the outer diameter of the outer ring of the single-row tapered roller bearing close to the A end face, and marking the high point a1 of the outer diameter deformation of the A end face and the low point a2 of the outer diameter deformation of the A end face, and obtaining a diameter variation of 2.7 mm; Measure the outer diameter of the outer ring of the single-row tapered roller bearing close to 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 1.9 mm.

[0038] 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 values ​​is between 0.5 mm and 1.0 mm, step S300 is started.

[0039] 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) to the side away from the deformation high point, and the ejector tool 10 is started, and the outer diameter deformation low point is turned into the outer diameter deformation high point by the ejector tool 10; After shaping, it is heated and kept warm in a tempering furnace; The diameter change Y after top forming is 5.1mm. Y=top profile ratio 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.

[0040] The diameter change after tempering was measured to be 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 and qualified.

[0041] See also Figure 6 In Example 2, 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 height of 88 mm and a diameter of 1350 mm, which is a high-carbon chromium bearing steel with a martensitic structure. According to 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: Step S100, measuring the outer diameter of the outer ring of the single-row tapered roller bearing close to the A end face, and marking the high point a1 of the outer diameter deformation of the A end face and the low point a2 of the outer diameter deformation of the A end face, and obtaining a diameter variation of 3.6 mm; Measure the outer diameter of the outer ring of the single-row tapered roller bearing close to 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 2.9 mm.

[0042] The diameter changes near the A end face and the B end face are both 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 1 m in the figure is equal to 90°), forming a 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 values ​​is between 0.5 mm and 1.0 mm, step S400 is started.

[0043] Step S400, placing a push-up tooling 10 at the inner diameter corresponding to the midpoint of the line connecting the outer diameter deformation low point of the A end face and the outer diameter deformation low point of the B end face, and applying force to the push-up tooling 10 to turn the outer diameter deformation low point into the outer diameter deformation high point; After shaping, it is heated and kept warm in a tempering furnace.

[0044] The diameter change Y after top forming is 5.5mm. For the A end face, Y=top type ratio 1.53*3.6mm=5.5mm, For the B end face, Y=top type magnification 1.9*2.9mm=5.5mm, When the outer ring of the single-row tapered roller bearing is made of bainitic high-carbon chromium bearing steel, the top shape formula in step S400 is satisfied.

[0045] The diameter change after tempering was measured to be 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.

[0046] 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 height of 88 mm and a diameter of 1350 mm, which is a high-carbon chromium bearing steel with a martensitic structure. According to 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: Step S100, measuring the outer diameter of the outer ring of the single-row tapered roller bearing close to the A end face, and marking the high point a1 of the outer diameter deformation of the A end face and the low point a2 of the outer diameter deformation of the A end face, and obtaining a diameter variation of 2.2 mm; Measure the outer diameter of the outer ring of the single-row tapered roller bearing close to 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.

[0047] 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 values ​​is between 0.5 mm and 1.0 mm, step S300 is started.

[0048] 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) to the side away from the deformation high point, and the ejector tool 10 is started, and the outer diameter deformation low point is turned into the outer diameter deformation high point by the ejector tool 10; After shaping, it is heated and kept warm in a tempering furnace; The diameter change Y after top forming is 3.9mm. 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.

[0049] The diameter change measured after tempering 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.

[0050] 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 height of 102 mm and a diameter of 1760 mm, which is a high-carbon chromium bearing steel with a bainite structure. According to 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: Step S100, measuring the outer diameter of the outer ring of the single-row tapered roller bearing close to the A end face, and marking the high point a1 of the outer diameter deformation of the A end face and the low point a2 of the outer diameter deformation of the A end face, and obtaining a diameter variation of 3.8 mm; Measure the outer diameter of the outer ring of the single-row tapered roller bearing close to 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 3.1 mm.

[0051] The diameter changes near the A end face and the B end face are both 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 1 m in the figure is equal to 90°), forming a 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 values ​​is between 0.5 mm and 1.0 mm, step S400 is started.

[0052] Step S400, placing a push-up tooling 10 at the inner diameter corresponding to the midpoint of the line connecting the outer diameter deformation low point of the A end face and the outer diameter deformation low point of the B end face, and applying force to the push-up tooling 10 to turn the outer diameter deformation low point into the outer diameter deformation high point; After shaping, it is heated and kept warm in a tempering furnace.

[0053] The diameter change Y after top forming is 7.2mm. For the A end face, Y=top type magnification 1.89*3.8=7.2mm, For the B end face, Y = top type magnification 2.32 * 3.1mm = 7.2mm, When the outer ring of the single-row tapered roller bearing is made of bainitic high-carbon chromium bearing steel, the top shape formula in step S400 is satisfied.

[0054] The diameter change was measured after tempering, which was 1.4mm on the side close to the A end face and 1.1mm on the side close to the B end face, both of which were less than the standard deformation threshold of 2.08mm and qualified.

[0055] 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 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, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0056] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0057] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In the present invention, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

Claims

1. 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, 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 A end face outer diameter deformation and the low point of the A end face outer diameter deformation to obtain the diameter change S A ; Measure the outer diameter of the outer ring of the single-row tapered roller bearing close to the B end face, and mark the high point of the outer diameter deformation of the B end face and the low point of the outer diameter deformation of the B end face to obtain the diameter change S B ; S200、 The 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 the outer diameter deformation of end face A and the low point of the outer diameter deformation of end face A is less than 90°, the high point of the outer diameter deformation of end face A corresponds to the high point of the outer diameter deformation of end face B, the low point of the outer diameter deformation of end face A corresponds to the low point of the 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; The diameter change S A And diameter variation S B The angle between the high point of the outer diameter deformation of end face A and the low point of the outer diameter deformation of end face A is equal to 90°, the high point of the outer diameter deformation of end face A corresponds to the high point of the outer diameter deformation of end face B, the low point of the outer diameter deformation of end face A corresponds to the low point of the 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, S400 is started; 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 away from the deformation high point, and the top-type tooling is started, so that the outer diameter deformation low point becomes the outer diameter deformation high point through the tooling force; After shaping, it is heated and kept warm in a tempering furnace; S400, a top-type tool is installed at the inner diameter corresponding to the midpoint of the line connecting the low point of the outer diameter deformation of the A end face and the low point of the outer diameter deformation of the B end face, and the force applied to the tool causes the low point of the outer diameter deformation to become the high 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 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 through the number of rotations of the pointer of the dial indicator, and determining the diameter variation.

7. The outer ring shaping process 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 away from the end face.

8. The outer ring shaping process of a single-row tapered roller bearing according to claim 1, characterized in that: The measuring ruler comprises 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 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 shaping and tempering temperature of the tempering furnace for heating and heat preservation 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 bainitic 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 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 shaping and tempering temperature of the tempering furnace for heating and heat preservation in step S400 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 S400 is 250°C to 270°C, and the shaping and tempering time is 10h to 15h.

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