Negative clearance fitting method for wind power ball structure bearing

Abstract

The invention relates to a negative clearance fitting method for a wind power ball structure bearing. The method comprises the steps of inner and outer ring machining, inner and outer ring measuring and fitting of the inner and outer rings and a steel ball. The inner ring and outer ring machining comprises the steps of semi-finish turning and finish turning of the inner ring and the outer ring respectively; the inner ring and the outer ring are measured by adopting a square tube ruler after respective finish turning procedures are completed; the inner ring, the outer ring and the steel ball are combined in a theoretical manner according to the size of the steel ball after the sizes of raceways of the inner ring and the outer ring are measured respectively. According to the method, the measuring mode is changed by changing the machining mode, the size of a roller path is indirectly obtained by measuring the size of a flange and serves as the roller path fitting size, and then fitting is completed. The fitting success rate is improved; the technical defects that measurement is inaccurate due to the fact that measurement methods are different or measurement errors exist due to changes of contact positions of a spherical device and a raceway when measurement is conducted by two persons in a traditional sleeving mode, measurement efficiency is low due to the fact that measurement concentration degrees of the two persons are inconsistent, and steel balls need to be replaced repeatedly due to measurement inaccuracy are overcome.

Description

Technical Field

[0001] The invention relates to a negative clearance sleeve assembly method for a wind power ball structure bearing, relates to a wind power ball bearing processing and measurement technology, and belongs to the technical field of wind power bearing sleeve assembly. Background Art

[0002] The clearance of wind turbine ball structure bearings is one of the important conditions that affect the service life of large wind turbine yaw and pitch bearings. Wind turbine ball structure bearings are divided into inner and outer rings. Before the bearings are assembled, the raceway dimensions of the inner and outer rings need to be measured respectively, and then the theoretical assembly is carried out according to the size of the steel ball.

[0003] After the wind power ball bearing is assembled, the clearance is negative and cannot be measured. It can only be reflected indirectly through torque, and the assembly success rate is low. For small orders of bearings, the inner and outer rings of small batches of bearings with an order quantity of less than 3 are difficult to assemble, and it is easy to fail to assemble and cause excess rework; resulting in reworked products, small allowances when reworking the raceway, and high processing difficulty.

[0004] In the existing negative clearance assembly method of wind turbine ball structure bearings, in the processing and measurement methods, the fine turning process turns the ribs and raceways respectively; after processing, the raceway size is measured with a ball head ruler, the front part of the ball head ruler is spherical, and the existing measuring device is complex to manufacture, and corresponding spherical devices need to be manufactured for different raceways and then assembled on the square ruler; in the above process, the bearing raceway size is affected by the raceway groove type, and the measurement is inaccurate; at the same time, the measuring tool has high requirements on the quality and measurement techniques of the measuring personnel.

[0005] The specific prior art has the following defects: Inaccurate measurement: The ball head gauge requires two people to cooperate in measurement. Due to the different measurement techniques of each person and the changes in the contact position between the spherical device and the raceway, there is a certain measurement error; Low measurement efficiency: The ball head ruler requires two people to cooperate in the measurement. The auxiliary measurer and the main measurer need to maintain the same concentration during the measurement. If one person makes a mistake in the operation, it is necessary to readjust and measure again; Low fitting success rate: Inaccurate measurement will lead to inappropriate clearance between the inner and outer rings. At this time, the steel balls need to be replaced repeatedly. When the steel ball size cannot meet the clearance, it is even necessary to re-repair the raceway. Summary of the invention

[0006] In view of the technical problems existing in the negative clearance assembly of the above-mentioned wind turbine spherical structure bearing, the purpose of the present invention is to provide a negative clearance assembly method for a wind turbine spherical structure bearing, which can effectively improve the measurement accuracy, increase the assembly success rate, and improve production efficiency.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a method for fitting a wind power ball structure bearing with negative clearance, including: inner and outer ring processing, inner and outer ring measurement, and fitting the inner and outer rings and steel balls; The inner and outer ring processing includes: semi-finishing and finishing turning of the inner and outer rings respectively; the inner and outer ring measurements are performed using a square tube ruler after completing the finishing turning process; The inner and outer rings and the steel balls are fitted together by measuring the raceway dimensions of the inner and outer rings respectively and then fitting them together theoretically according to the dimensions of the steel balls.

[0008] Furthermore, the assembly is carried out using the clearance assembly theory, which is: after measuring the raceway dimensions of the inner and outer rings respectively, test assembly is carried out using steel balls of different specifications, and the clearance is measured to find the steel ball "X" of the "0" clearance specification, and then the corresponding steel ball is selected according to the drawing requirements.

[0009] Furthermore, the processing of the outer ring includes the following steps: In the lathe processing step, the outer ring is placed on a CNC lathe and fixed by a plurality of evenly arranged clamping jaws arranged on the lathe chassis; a lathe tool is installed above the outer ring through a tool holder; Semi-finishing turning: First turn the outer ring rib, and reserve a 0.1mm margin for the diameter of the rib according to the finished product size; then turn the outer ring raceway, and reserve a 0.1mm margin for the diameter of the raceway according to the finished product size; After completing the above turning, loosen each clamping jaw and realign it. The alignment point is required to be within 0.01mm and the adjacent point is required to be within 0.03mm. Together, ensure that the surface after processing is controlled within the range of ovality ≤ 0.03; Finish turning: The ribs and raceways are turned synchronously by turning the ribs and raceways in one cut to the finished product size; The above-mentioned clamping jaws are evenly arranged in four along the circumference of the lathe chassis, wherein the two clamping jaws symmetrically arranged at 180° are the point clamping jaws, and each two adjacent clamping jaws are the adjacent point clamping jaws; the above-mentioned control of ovality ≤ 0.03 is required to meet the requirement of design ovality ≤ 0.05; wherein, when the four clamping jaws are loosened and the semi-finishing turning is released, the deformation of the bearing caused by excessive clamping force and large turning amount is eliminated; Furthermore, the tool block model used for turning the rib and raceway in one cut is RGN090300, that is, 9.52CBN disc; the turning parameters are as follows: speed (r / min): 18-21r / min; feed (mm / r): 0.1-0.2mm / r.

[0010] Furthermore, the outer ring is measured by using a square tube ruler to measure the outer ring rib size as the raceway sleeve size; When measuring the outer ring rib, the square tube ruler used is a measuring tool known in the prior art. When in use, the square tube ruler whose length is greater than the outer ring diameter is placed on the end face of the outer ring so that the two measuring heads of the square tube ruler are in contact with the outer ring rib respectively. The rib size is obtained by observing the reading of the measuring dial through the measuring gauge of the measuring head on one side, and then used as the raceway fitting size.

[0011] In this solution, the inner ring is processed in the same way as the outer ring.

[0012] The beneficial effects of the technical solution of the present invention are: The method changes the measuring method by changing the processing method. There is no need to directly measure the raceway. The raceway size is indirectly obtained by measuring the rib size as the raceway fitting size to complete the fitting. The measurement accuracy, fitting success rate and production efficiency can be effectively improved. The method makes up for the technical defects of the traditional fitting method, such as inaccurate measurement caused by measurement errors due to different measurement techniques or changes in the contact position between the spherical device and the raceway when two people measure, low measurement efficiency caused by inconsistent measurement concentration of two people, and repeated replacement of steel balls due to inaccurate measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a diagram of the outer ring machining state (finishing machining path) in the sleeve assembly method of the present invention.

[0014] Figure 2 This is a schematic diagram of the outer ring machining completion status.

[0015] Figure 3 This is an example diagram of the finished product size after machining in the assembly method of the present invention.

[0016] In the figure, 1, rib, 2, raceway, 3, tool holder. 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. Example

[0018] As shown in the figure, a method for fitting a wind power ball structure bearing with negative clearance includes: inner and outer ring processing, inner and outer ring measurement, and fitting the inner and outer rings and steel balls; The inner and outer ring processing includes: semi-finishing and finishing turning of the inner and outer rings respectively; the inner and outer ring measurements are performed using a square tube ruler after completing the finishing turning process; The inner and outer rings and the steel balls are fitted together by measuring the raceway dimensions of the inner and outer rings respectively and then fitting them together theoretically according to the dimensions of the steel balls. Furthermore, the assembly is carried out using the clearance assembly theory, which is: after measuring the raceway dimensions of the inner and outer rings respectively, test assembly is carried out using steel balls of different specifications, and the clearance is measured to find the steel ball "X" of the "0" clearance specification, and then the corresponding steel ball is selected according to the drawing requirements.

[0019] Specifically, for example: the requirement is -0.01 to -0.05mm, so we can choose a steel ball with the specification of "X+0.01 to +0.05".

[0020] Furthermore, the processing of the outer ring includes the following steps: In the lathe processing step, the outer ring is placed on the CNC lathe and fixed by four evenly arranged clamping jaws arranged on the lathe chassis; a lathe tool is installed above the outer ring through a tool holder 3; the four clamping jaws are evenly arranged along the circumference of the lathe chassis, wherein the two clamping jaws symmetrically arranged at 180° are the point clamping jaws, and every two adjacent clamping jaws are the adjacent point clamping jaws; Semi-finishing turning: First turn the outer ring rib, and reserve a 0.1mm margin for the diameter of the rib according to the finished product size; then turn the outer ring raceway, and reserve a 0.1mm margin for the diameter of the raceway according to the finished product size; After completing the above turning, loosen each clamping jaw and realign it. The alignment point is required to be within 0.01mm and the adjacent point is required to be within 0.03mm. Together, ensure that the surface after processing is controlled within the range of ovality ≤ 0.03; Finish turning: The rib 1 and raceway 2 are turned synchronously by turning the rib 1 and raceway 2 in one cut to the finished size, such as Figure 2 As shown; Furthermore, the one-cut turning of the rib 1 and the raceway 2 uses a cutter block model of RGN090300, that is, a 9.52CBN disc; the turning parameters are as follows: speed (r / min): 18-21r / min; feed (mm / r): 0.1-0.2mm / r.

[0021] Furthermore, the outer ring is measured by using a square tube ruler to measure the outer ring rib size as the raceway sleeve size; In this embodiment, taking the 033.65.2950.01 bearing product as an example, the diameter size of the fine-turned retaining edge is: φ2959.6 +0.5 / 0mm; the size of the fine-turned raceway ball is Φ2885±0.05mm.

[0022] When measuring the outer ring rib, the square tube ruler used is a measuring tool known in the prior art. When in use, the square tube ruler whose length is greater than the outer ring diameter is placed on the end face of the outer ring so that the two measuring heads of the square tube ruler are in contact with the outer ring rib respectively. The rib size is obtained by observing the reading of the measuring dial through the measuring gauge of the measuring head on one side, and then used as the raceway fitting size.

[0023] In the above-mentioned fitting method, since the flange 1 and the raceway 2 are turned in one cut, the foundation is laid for changing the measurement method, and the measurement is more convenient, and only the flange position needs to be measured; while in the traditional fitting method, the fitting size of the raceway can only be obtained by directly measuring the raceway.

[0024] It should be noted that the parts not described in detail in the present invention are prior art.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean 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, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] 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.

[0030] 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 fitting a wind turbine ball structure bearing with negative clearance, characterized in that: include: Inner and outer ring processing, inner and outer ring measurement, inner and outer ring and steel ball fitting; The inner and outer ring processing includes: semi-finishing and finishing turning of the inner and outer rings respectively; the inner and outer ring measurements are performed using a square tube ruler after completing the finishing turning process; The inner and outer rings and the steel balls are fitted together by measuring the raceway dimensions of the inner and outer rings respectively and then fitting them together theoretically according to the dimensions of the steel balls.

2. A method for fitting a wind turbine ball structure bearing with negative clearance according to claim 1, characterized in that: The fitting is carried out using the clearance fitting theory, which is: after measuring the raceway dimensions of the inner and outer rings respectively, test fitting is carried out using steel balls of different specifications, and the clearance is measured to find the steel ball "X" with a "0" clearance specification, and then the corresponding steel ball is selected according to the drawing requirements.

3. A method for fitting a wind turbine ball structure bearing with negative clearance according to claim 1, characterized in that: The processing of the outer ring includes the following steps: In the lathe processing step, the outer ring is placed on a CNC lathe and fixed by a plurality of evenly arranged clamping jaws arranged on the lathe chassis; a lathe tool is installed above the outer ring through a tool holder; Semi-finishing turning: First turn the outer ring rib, and reserve a 0.1mm margin for the diameter of the rib according to the finished product size; then turn the outer ring raceway, and reserve a 0.1mm margin for the diameter of the raceway according to the finished product size; After completing the above turning, loosen each clamping jaw and realign it. The alignment point should be within 0.01mm and the adjacent point should be within 0.03mm. Together, ensure that the surface after processing is controlled within the range of ovality ≤ 0.03; Finish turning: The ribs and raceways are turned synchronously by turning the ribs and raceways in one go to the finished size.

4. A method for fitting a wind turbine ball structure bearing with negative clearance according to claim 3, characterized in that: The tool block model used for turning the rib and raceway in one cut is RGN090300, that is, 9.52CBN disc; the turning parameters are as follows: speed (r / min): 18-21r / min; feed (mm / r): 0.1-0.2mm / r.

5. A method for fitting a wind turbine ball structure bearing with negative clearance according to claim 1, characterized in that: The outer ring is measured by using a square tube ruler to measure the outer ring rib size as the raceway fitting size.

6. A method for fitting a wind turbine ball structure bearing with negative clearance according to claim 5, characterized in that: When measuring the outer ring rib as mentioned above, a square tube ruler whose length is greater than the outer ring diameter is placed on the end face of the outer ring so that the two measuring heads of the square tube ruler are in contact with the outer ring rib respectively; the rib size is obtained by observing the reading of the measuring dial through the measuring gauge of the measuring head on one side, and then used as the raceway fitting size.

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