Wind power three-row column structure bearing axial oil groove and flange machining method

Abstract

The invention relates to the technical field of bearing machining, in particular to a method for machining axial oil grooves and flanges of a wind power three-row-column structure bearing. Comprising the following steps that firstly, an oil groove and a flange required by a drawing are roughly turned according to a conventional turning technology, and conventional quenching and tempering are conducted; 2, after quenching and tempering, the deformation amount of the oil groove and the flange is detected; thirdly, according to the measured oil groove deformation value, the flange and the oil groove are turned firstly, and then the oil groove is ground or the oil groove and the flange are directly ground; and after the third step is completed, the ferrule is cleaned and subjected to other follow-up treatment work in a conventional mode. According to the machining method, the size requirements of the flanges and the oil grooves can be met while the depth of the quenched hard turning layer is reserved to the maximum extent, the production efficiency is improved, and the machining cost is reduced; turning is replaced by grinding, so that the problem that quenching boundaries are bulged in a turning mode is solved; and the grinding mode is utilized to shorten the processing time and improve the production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing processing, and specifically to a processing method for axial oil grooves and ribs of a wind power three-row column structure bearing. Background Art

[0002] The depth, size, appearance of the hardened layer of the axial oil groove and the quality of the raceway rib are one of the important conditions affecting the service life of large wind power three-row column structure yaw and pitch bearings. There are the following problems in the processing of such wind power three-row column structure bearings: ① After the bearing is quenched, the deformation is large, and the depth of the hardened layer of the oil groove becomes shallower after hard turning, not meeting the design requirements; ② After the bearing is quenched, the deformation is large, and the size of the oil groove after hard turning does not meet the drawing requirements; ③ The processing cost of hard turning the oil groove is high; ④ After hard turning, a protrusion will be formed at the boundary between the quenched and unquenched areas of the rib, and the convex point needs to be removed by re-turning.

[0003] Taking the 133.50.2965.03 (YJ) product in the prior art as an example, the processing process of the oil groove and the rib; ① First, the raceway is quenched. Affected by the wall thickness L between the oil groove and the mounting hole (as Figure 1 shown), the depth H of the hardened layer of the oil groove quenching needs to be controlled within H + 0.5; ② After tempering, the ovality of the oil groove and the rib is detected. When the ovality exceeds > 0.5 + the product shrinkage, thermal shaping is required to control the ovality < within 0.5 + the product shrinkage; ③ Hard turn the raceway rib (turn to a circle, with the required ovality of 0.1). If the finished product requirement of the oil groove is D ± 0.2 and the ovality is 0.4 at this time, then when turning the rib, the maximum radial dimension point between the oil groove and the rib should be controlled below 0.4 while ensuring that the size of the rib itself is within the tolerance range; ④ Hard turn the oil groove, just turn off all the oxide scales, machine with the minimum amount, ensure the deepest hardened layer after quenching, and ensure that the size of the oil groove is D ± 0.2; The technical defects in the above process are: ① Affected by raceway quenching and tooth surface quenching, the bearing will deform. According to the statistical data of 100 products, the diameter deformation is generally in the range of 0.6 - 1.4 mm, and the product shrinkage is in the range of 0 - 0.4 mm. When the product shrinkage is 0.4 / 2 + the quenching allowance of 0.5 = 0.7, it just meets the requirements of the maximum deformation product. When the product shrinkage is small and the deformation is large, after turning, the finished product requirements of the hardened layer of the oil groove cannot be met, and thermal shaping is required; ② Affected by the forging material, quenching, and machining, for products of the same size, the deformation amounts are different, resulting in some products having a large turning amount and some products having a small turning amount, causing waste of tools and waste of working hours; ③ After hard turning the oil groove according to the unified size, the hardened layer will be uneven in the circumferential direction, and the hardened layer on one side will be relatively shallow. When the deformation amount exceeds the reserved amount, the radial dimension of the oil groove at a certain position will not meet the drawing requirements. ④ After hard turning, a protrusion will be formed at the boundary between the quenched and unquenched parts on the retaining edge. When the finished product is assembled, it will just contact the spacer block, resulting in cage chips and affecting the service life of the bearing. The hard turning of the oil groove has a high processing cost and low production efficiency. Summary of the Invention

[0004] In view of the technical problems existing in the above-mentioned prior art, the present invention provides a processing method for the axial oil groove and retaining edge of a wind power three-row column structure bearing by changing the process and adopting grinding instead of turning. It can maximize the retention of the hardened layer depth after hard turning while meeting the dimensional requirements of the retaining edge and oil groove, and improve production efficiency and reduce processing costs.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: a processing method for the axial oil groove and retaining edge of a wind power three-row column structure bearing, characterized in that it includes the following steps: Step 1: Rough turn the oil groove and retaining edge required by the drawing according to the conventional turning process, and perform conventional quenching and tempering. Step 2: Detect the deformation amount of the oil groove and retaining edge after quenching and tempering. Step 3: According to the measured deformation amount value of the oil groove, after turning the retaining edge and oil groove first, grind the oil groove or directly grind the oil groove and retaining edge. After completing Step 3, clean the ring and perform other subsequent processing operations in the conventional manner.

[0006] Further, the detection of the deformation amount of the oil groove and retaining edge involved in Step 2 is to place the ring on the processing workbench and detect it by using a dial indicator in the conventional manner. Further, in Step 3, the grinding of the oil groove is to polish and grind it by using a profiling grinding wheel mechanism. Further, in Step 3, when the deformation amount X of the oil groove > 0.4 mm, turn the retaining edge and oil groove first, and then grind the oil groove. Further, the profiling grinding wheel mechanism includes: a grinding wheel shaft and a grinding wheel body connected to the grinding wheel shaft. The upper end of the grinding wheel shaft is connected to the upper power device by bolts. The grinding wheel body is a profiling design consistent with the shape of the oil groove. An annular chip discharge groove is provided on the lower end surface of the grinding wheel body to facilitate the discharge of the waste chips generated when the grinding wheel grinds the workpiece. Further, in Step 3, when the deformation amount X of the oil groove < 0.4 mm, directly grind the oil groove and retaining edge.

[0007] The beneficial effects of adopting this technical solution are: This processing method can maximize the retention of the hardened turning layer depth while meeting the dimensional requirements of the rib and oil groove, and improve production efficiency and reduce processing costs. By using grinding instead of turning, the problem of raised quenching boundaries in the turning method is solved. The grinding method shortens the processing time and improves production efficiency. Description of the Drawings

[0008] Figure 1 Figure 6 is a schematic diagram of the hard turning oil groove of a product in the prior art.

[0009] Figure 2 Figure 10 is a schematic diagram of the processing state of grinding the oil groove and rib using a grinding wheel according to the method of the present invention.

[0010] Figure 3 Figure 14 is a statistical data table of the oil groove deformation amount during the processing of the present invention.

[0011] In the figures, 1 is the oil groove, 2 is the rib, 3 is the grinding wheel shaft, 4 is the grinding wheel body, and 4.1 is the chip discharge groove. Detailed Embodiments

[0012] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following detailed description of the specific embodiments of the present invention will be given in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand 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 departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0013] The present solution is a processing method for the axial oil groove and rib of a wind power three-row column structure bearing taking the product of 133.50.2965.03 (YJ) as an example, which is characterized in that it includes the following steps: Step 1: Rough turn the oil groove and rib required by the drawing according to the conventional turning process, and perform conventional quenching and tempering; Step 2: Detect the deformation amount of the oil groove and rib after quenching and tempering; Step 3: According to the measured deformation amount value of the oil groove, perform turning of the rib and oil groove first, and then grind the oil groove or directly grind the oil groove and rib; After completing Step 3, clean the ring and perform other subsequent processing operations in a conventional manner.

[0014] Further, the detection of the deformation amount of the oil groove and rib involved in Step 2 is to place the ring on the workbench and detect it using a dial indicator in a conventional manner; Further, in Step 3, the grinding of the oil groove is to polish and grind it using a profiling grinding wheel mechanism; Further, in Step 3, when the deformation amount X of the oil groove > 0.4 mm, turn the rib and oil groove first, and then grind the oil groove; Specifically, for turning the rib and oil groove, the turning allowance X is -0.4 - 0.1 mm; an profiling grinding wheel mechanism is used for polishing and grinding the oil groove. Among them, the grinding wheel has a grit size of 180#, a hardness of 7P, a shape of 350 * 25 mm, and is ground into an arbitrary R-shaped oil groove. The axial depth of cut of the grinding wheel is 0.05 - 0.1 mm, the radial depth of cut is 0.1 - 0.2 mm, the grinding wheel speed is 1500 - 1600 r / min, and the workpiece speed is 4 - 5 r / min; Further, the profiling grinding wheel mechanism includes: a grinding wheel shaft 3 and a grinding wheel body 4 connected to the grinding wheel shaft 3. The upper end of the grinding wheel shaft 3 is bolted to the upper power device. The outer contour of the grinding wheel body 4 is a profiling design consistent with the shape of the oil groove. An annular chip discharge groove 4.1 is provided on the lower end face of the grinding wheel body 4 to facilitate the discharge of chips generated when the grinding wheel grinds the workpiece; Further, in the third step, when the deformation amount X of the oil groove < 0.4 mm, directly grind the oil groove and the rib; only round it during this process, the grinding allowance < 0.4 mm, and check whether it is qualified after grinding; Since the deformation amount has been detected to be < 0.4 mm before grinding, that is, the allowance can meet the requirements of grinding, the size after grinding, and the hardened layer all meet the drawing requirements.

[0015] The deformation amount of 0.4 mm of the oil groove in the third step is the allowance of 0.4 mm left for rough turning to finish turning; if the deformation amount exceeds 0.4 mm, for example, the deformation amount is 0.5 mm, at this time, the size is turned round, and the hardened layer will become shallower, not meeting the product requirements.

[0016] The deformation amount of the oil groove provided in this solution is 0.4 mm, which is determined as the best critical point for using the grinding method in this solution through data statistics during the processing of a large number of products. The specific detailed data is as Figure 3 shown in Table 1 below.

[0017] Based on the above technical solution, this solution uses grinding instead of turning. Because the surface roughness after grinding is generally Ra0.2 - 0.3, while the surface roughness after turning is generally Ra0.8 - 1.6; the surface roughness generally refers to the size of the unevenness. Using the grinding method is a way to reduce the unevenness value, and it solves the problem of the raised quenching boundary.

[0018] It should be noted that the parts not detailed in the present invention are prior art.

[0019] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is 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. Therefore, it should not be construed as a limitation to the present invention.

[0020] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0021] In the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0023] It should be noted that when an element is referred to as being "fixed to" or "disposed 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", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0024] The above examples are only the best embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and many variations are possible. All variations that can be directly derived or associated with the contents disclosed by a person skilled in the art should be considered as the protection scope of the present invention.

Claims

1. A method for processing axial oil grooves and ribs of a three-row column structure bearing of a wind power plant, characterized in that: The following steps are involved: Step 1: Roughly turn the oil grooves and flanges required by the drawing according to the conventional turning process, and perform conventional quenching and tempering; Step 2: Check the deformation of the oil groove and flange after quenching and tempering; Step 3: According to the measured oil groove deformation value, the rib and oil groove are first turned, and then the oil groove is ground or the oil groove and rib are directly ground; After completing step 3, clean the ferrule and perform other subsequent processing in the conventional manner.

2. The method for processing the axial oil groove and rib of the wind power three-row column structure bearing according to claim 1 is characterized in that: The oil groove grinding in step three is performed by polishing and grinding using a profile grinding wheel mechanism.

3. The method for processing the axial oil groove and rib of the wind power three-row column structure bearing according to claim 1 is characterized in that: In the step three, when the deformation amount X of the oil groove is greater than 0.4 mm, the rib and the oil groove are first turned, and then the oil groove is ground.

4. The method for processing the axial oil groove and rib of the wind power three-row column structure bearing according to claim 3 is characterized in that: Turning ribs and oil grooves, the turning amount is X -0.4-0.1mm; polishing and grinding the oil grooves with a profile grinding wheel mechanism, wherein the grinding wheel particle size is 180#, the hardness is 7P, the grinding wheel shape is 350*25mm, and any R-shaped oil groove is ground. The axial cutting amount of the grinding wheel is 0.05-0.1mm, the radial cutting amount is 0.1-0.2mm, the grinding wheel speed is 1500-1600r / min, and the workpiece speed is 4-5r / min.

5. The method for processing the axial oil groove and rib of the wind power three-row column structure bearing according to claim 2 is characterized in that: The profiling grinding wheel mechanism comprises: a grinding wheel shaft and a grinding wheel body connected to the grinding wheel shaft. The upper end of the grinding wheel shaft is connected to the upper power device by bolts. The outer contour of the grinding wheel body is a profiling design consistent with the shape of the oil groove. The lower end surface of the grinding wheel body is provided with an annular cutting groove.

6. The method for processing the axial oil groove and rib of the wind power three-row column structure bearing according to claim 1, characterized in that: In the step three, when the oil groove deformation X is less than 0.4 mm, the oil groove and the rib are directly ground; this process only requires rounding, the grinding amount is less than 0.4 mm, and after grinding, it is tested whether it is qualified.

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