Processing technology for subdividing cylindrical roller bearing

Abstract

The invention relates to the technical field of bearing machining, in particular to a machining process of a split cylindrical roller bearing, and an outer ring machining method comprises the following steps: machining an outer ring raceway on the inner diameter of an outer ring; the positions close to the circular grooves are marked, so that the split semicircular grooves are in one-to-one correspondence; and the groove bottom of the V-shaped ring groove is cut to a certain size, three-point linear cutting is carried out, and then the outer ring is prized and split into two half outer rings through machining. According to the invention, the completeness of the circular groove and the width precision of the outer ring raceway after subsequent assembly are ensured, a gap between the clamping ring and the circular groove during assembly is prevented, and the situation that the service life of the bearing is influenced due to the fact that a roller is clamped in the use process of the bearing can be prevented.

Description

Technical Field

[0001] The invention relates to the technical field of bearing processing, and in particular to a processing technology for split cylindrical roller bearings. Background Art

[0002] Extrusion granulator is a dry granulation process that uses pressure to agglomerate solid materials. The material is squeezed by two counter-rotating rollers, which are driven by an eccentric sleeve or a hydraulic system. When the solid material is squeezed, the air between the powder particles is first expelled to rearrange the particles to eliminate the gaps between the materials.

[0003] In recent years, the performance and structure of large-scale extrusion granulators have been continuously updated and iterated. Among them, the bearing of the high-torque co-directional parallel twin-screw gearbox is a key component, and the bearing structure has also been innovated and continuously developed.

[0004] The outer ring is split into two halves from the outer diameter. During assembly, several circular grooves on the outer diameter are used to cooperate with the clamping ring to make the two halves of the outer ring fit together. Compared with traditional cylindrical roller bearings and split bearings, it has more characteristics. Due to the particularity of its structure, the processing technology of traditional bearings cannot be applied. It is urgent to develop a processing technology specifically for this type of split cylindrical roller bearing. Summary of the invention

[0005] In view of the defects of the prior art, the present invention provides a processing technology for split cylindrical roller bearings, which ensures the integrity of the circular groove and the accuracy of the outer ring raceway width after subsequent assembly, prevents the formation of gaps between the clamping ring and the circular groove during assembly, and can also prevent the rollers from being clamped during the use of the bearing, affecting the service life of the bearing.

[0006] In order to achieve the above-mentioned purpose, the technical solution provided by the present invention is a processing technology for a split cylindrical roller bearing, the split cylindrical roller bearing includes an inner ring, an outer ring and a cylindrical roller, a V-shaped ring groove is provided along the circumferential direction of the outer diameter at half of the outer diameter of the outer ring, a plurality of circular grooves are provided with the groove bottom of the V-shaped ring groove as the center line, and the plurality of circular grooves are evenly distributed in the circumferential direction of the outer diameter of the outer ring; the processing technology includes an outer ring processing method, the outer ring processing method includes processing an outer ring raceway on the inner diameter of the outer ring; marking is performed at a position close to the circular groove so that the semicircular grooves after splitting correspond one to one; cutting is performed at the groove bottom of the V-shaped ring groove, three-point wire cutting is performed when the cutting is to a certain size, and then the outer ring is pried open and split into two semi-outer rings by machining.

[0007] Furthermore, the cutting is performed at the bottom of the V-shaped ring groove, and during the cutting, the total feed amount is 0.6 mm to 0.7 mm, and then the wire cutting is performed.

[0008] Furthermore, the specific method for performing three-point wire cutting includes selecting three circular grooves, determining a cutting line between each group of two adjacent circular grooves, the cutting line is tangent to the side of the two circular grooves away from the outer ring axis, and a total of three cutting lines are determined. Wire cutting is performed based on the cutting lines, and the V-shaped ring grooves in the three circular grooves are retained without cutting.

[0009] Preferably, the three cutting lines are in the form of an equilateral triangle.

[0010] Furthermore, the outer ring processing method includes dressing a grinding wheel, dressing the surface of the grinding wheel to form a surface of a processing outer ring raceway, wherein the surface of the processing outer ring raceway includes a straight line segment and convexity segments symmetrically arranged on both sides of the straight line segment; The raceway of the outer ring is ground with the dressed grinding wheel.

[0011] Furthermore, the processing technology also includes an outer ring assembly method, which includes determining the correspondence between the circular grooves on the two split half outer rings according to the marks, and assembling them one by one.

[0012] Furthermore, when installing the clamping ring inside the circular groove, first install three clamping rings evenly distributed in the circumferential direction of the outer ring, and then install the other clamping rings.

[0013] Furthermore, before cutting, the distance from the bottom of the V-shaped ring groove to the inner diameter is 1 mm to 1.5 mm.

[0014] A grinding wheel for machining split cylindrical roller bearings comprises a surface for machining an outer ring raceway, wherein the surface for machining the outer ring raceway comprises a straight line segment and convexity segments symmetrically arranged on both sides of the straight line segment.

[0015] Furthermore, the curvature of the convex section is 3 μm to 5 μm.

[0016] The beneficial effects of the present invention are as follows: when processing the outer ring, an outer ring raceway is processed on the inner diameter, and multiple circular grooves are processed with the V-shaped ring groove as the center line, and the splitting is carried out after marking, and the splitting is carried out in multiple steps. The specific steps of the splitting include three-point line cutting, rather than cutting all the way to the bottom, which not only ensures the width size of the outer ring raceway, but also ensures the correspondence and integrity of the circular grooves after subsequent assembly, prevents the occurrence of gaps between the clamping ring and the circular groove during assembly, and can also prevent the roller from being clamped during the use of the bearing, affecting the service life of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A cross-sectional view of a split cylindrical roller bearing in one embodiment of the present invention; Figure 2It is a schematic structural diagram of a split cylindrical roller bearing in one embodiment of the present invention; Figure 3 A cross-sectional view of an outer ring of a split cylindrical roller bearing in one embodiment of the present invention; Figure 4 A schematic diagram of a V-shaped ring groove bottom being cut off by a tool in one embodiment of the present invention; Figure 5 It is a schematic diagram of grinding the raceway of the outer ring using a dressed grinding wheel in one embodiment of the present invention; Figure 6 The specific steps of the processing technology for splitting a cylindrical roller bearing in one embodiment of the present invention; Figure 7 A schematic diagram of performing three-point line cutting in one embodiment of the present invention; Figure 8 It is a three-dimensional schematic diagram of performing three-point wire cutting in one embodiment of the present invention; In the figure: 100, outer ring, 110, half outer ring, 120, clamping ring, 130, V-shaped ring groove, 140, circular groove, 150, outer ring raceway, 151, inner groove, 200, inner circle, 300, cylindrical roller, 400, cage, 10. Grinding wheel, 11. Straight line segment, 12. Convexity segment, 20. Knives, M1, the end point of the first wire cutting, M2, the end point of the second wire cutting, M3, the end point of the third wire cutting. DETAILED DESCRIPTION

[0018] 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.

[0019] See also Figure 1-Figure 5, shows a schematic structural diagram of a split cylindrical roller bearing, which includes an outer ring 100, an inner ring 200, and a cylindrical roller 300 disposed between the outer ring 100 and the inner ring 200. A V-shaped annular groove 130 is provided at half of the outer diameter of the outer ring 100 along the circumferential direction of the outer diameter, and a plurality of circular grooves 140 are provided with the groove bottom of the V-shaped annular groove 130 as the center line, and the plurality of circular grooves 140 are evenly distributed in the circumferential direction of the outer diameter of the outer ring 100; an outer ring raceway 150 is provided on the inner diameter of the outer ring 100, and an inner groove 151 is provided in the middle position of the outer ring raceway 150, and the inner groove 151 accommodates at least part of the retainer 400, and the outer ring 100 is assembled from two half outer rings 110, and the two half outer rings 110 are fixed together by a plurality of circular clamping rings 120. In this embodiment, 13 circular clamping rings 120 are provided.

[0020] An embodiment of the present invention provides a processing technology for a split cylindrical roller bearing, which includes an outer ring processing method, the outer ring processing method including processing an outer ring raceway 150 on the inner diameter of the outer ring; marking a position close to the circular groove 140 so that the semicircular grooves after splitting correspond one to one; cutting at the bottom of the V-shaped ring groove 130, cutting to a certain size, performing three-point wire cutting, and then machining to pry the outer ring 100 open and split it into two half outer rings 110.

[0021] See also Figure 2 and Figure 4 During the specific operation, in order to prevent confusion after the outer ring 100 is divided into two halves and it is impossible to distinguish the matching position, a paint pen can be used to mark the positions of the two half outer rings 110 close to the circular groove 140. The marking content of the two half rings of the same circular groove 140 is consistent. For example, the marking content of the first circular groove 140 of the first set of bearings is A1 and A2, and the marking content of the second circular groove 140 is B1 and B2. The first circular groove 140 of the second set of bearings is marked with other letters to distinguish them.

[0022] When processing the outer ring 100, the processing technology of the above-mentioned split cylindrical roller bearing processes an outer ring raceway 150 on the inner diameter, marks the position close to the circular groove 140, and splits it, and the splitting is carried out in multiple steps. The specific steps of splitting include three-point line cutting, rather than cutting all the way to the bottom. Not only does it ensure the width dimension of the outer ring raceway, but it also ensures the correspondence and integrity of the circular groove after subsequent assembly is completed, preventing a gap from appearing between the clamping ring and the circular groove during assembly, and can also prevent the roller from being clamped during the use of the bearing, affecting the service life of the bearing.

[0023] See also Figure 7 and Figure 8In one embodiment, the specific method of performing three-point wire cutting includes selecting three circular grooves, determining a cutting line between each group of two adjacent circular grooves, the cutting line is tangent to the side of the two circular grooves 140 away from the outer ring axis, and a total of three equilateral triangle cutting lines are determined, and three wire cuttings are performed based on the cutting line, and the V-shaped ring grooves in the three circular grooves are retained without cutting. Figure 7 and Figure 8 As shown, M1 is the wire cutting end point of the first wire cutting, M2 is the wire cutting end point of the second wire cutting, and M3 is the wire cutting end point of the third wire cutting.

[0024] Further, the three-point wire cutting is described in detail. The cutting lines of the three cuttings are equilateral triangles. After the wire cutting, the V-shaped ring grooves 130 in the three circular grooves 140 are retained without cutting, that is, the remaining three circular grooves 140 are still integrated after cutting. In this embodiment, the length of the V-shaped ring groove 130 at a single position is greater than 46 mm and less than 50 mm. The workpiece is pried open during subsequent machining.

[0025] It should be noted that the amount of wire cutting is 0.20 mm ~ 0.30 mm. If the outer ring is directly cut into two halves by wire cutting, the following two situations will occur: after the two halves of the outer ring 110 are put together, the circular groove 140 is not a complete circle in the plane. After the clamping ring 120 is placed in the circular groove, the tightening effect cannot be achieved, which will cause the risk of the clamping ring falling off during the use of the bearing; in addition, the width of the outer ring raceway is already the finished size, and the tolerance of the raceway width is only 0.06 mm. The amount of wire cutting that is completely done at one time will narrow the raceway width, resulting in a reduction in the service life of the bearing and early fatigue.

[0026] Furthermore, the outer ring processing method includes dressing the grinding wheel, dressing the surface of the grinding wheel 10 to form a surface of the outer ring raceway, and the surface of the outer ring raceway 150 includes a straight line segment 11 and convex segments 12 symmetrically arranged on both sides of the straight line segment 11; The raceway of the outer ring 100 is ground with the dressed grinding wheel 10 .

[0027] The particularity of the structure in this embodiment causes this type of product to be significantly different from conventional products in terms of process arrangement, different process processing methods, dressing of the grinding wheel 10 and related requirements.

[0028] In one embodiment, the processing technology also includes an outer ring assembly method, which includes determining the correspondence between the circular grooves 140 on the two split half outer rings according to the marks, and assembling them one by one.

[0029] In one embodiment, when installing the clamping ring 120 in the circular groove 140, three clamping rings 120 evenly distributed in the circumferential direction of the outer ring 100 are installed first, and then other clamping rings 120 are installed. In this way, the dimensional consistency and coaxiality of the two half outer rings 110 after being put together can be ensured.

[0030] Furthermore, before cutting, the distance from the bottom of the V-shaped annular groove 130 to the inner diameter is 1 mm to 1.5 mm.

[0031] A grinding wheel for machining split cylindrical roller bearings. The grinding wheel 10 includes a surface for machining an outer ring raceway. The surface for machining the outer ring raceway includes a straight line segment 11 and convexity segments 12 symmetrically arranged on both sides of the straight line segment 11.

[0032] See also Figure 6 An embodiment of the present invention provides a processing technology for a split cylindrical roller bearing, which includes an outer ring processing method. The specific steps of outer ring processing include rough grinding of the end face, fine turning of the end face, final grinding of the end face, rough turning of 1 / 2 outer diameter, fine turning of the raceway, fine turning of the outer diameter, fine grinding of the outer diameter, final grinding of the raceway, fine grinding of the outer diameter, final grinding of the raceway, dressing of the grinding wheel, final grinding of the raceway, super-fine grinding of the raceway, cutting, wire cutting, machining, pre-installation inspection, and assembly.

[0033] The rough turning of 1 / 2 outer diameter includes rough grinding of the outer diameter of the outer ring.

[0034] In the above embodiment, the steps of dressing the grinding wheel, final grinding the raceway, and superfinishing the raceway include dressing the surface of the grinding wheel 10 to obtain the surface of the outer ring raceway, and the surface of the outer ring raceway includes a straight line segment 11 and convex segments 12 symmetrically arranged on both sides of the straight line segment 11; and grinding the raceway of the outer ring 100 with the dressed grinding wheel 10.

[0035] It should be noted that the curvature of the convex section 12 is determined according to the curvature of the bearing raceway to be processed. In this embodiment, the curvature of the convex section 12 is 3 μm to 5 μm.

[0036] In the above embodiment, the steps of cutting, wire cutting and machining include marking on the V-shaped ring groove 130; cutting at the bottom of the V-shaped ring groove 130, cutting to a certain size and performing three-point wire cutting, and then machining to pry the outer ring 100 apart and split it into two half outer rings.

[0037] In the above embodiment, the assembly step includes determining the corresponding relationship between the circular grooves 140 on the two split half outer rings according to the marks, and assembling them one by one. When installing the clamping ring 120 inside the circular groove 140, first install three clamping rings 120 evenly distributed in the circumferential direction of the outer ring 100, and then install the other clamping rings 120.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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 processing technology for a split cylindrical roller bearing, the split cylindrical roller bearing comprising an inner ring, an outer ring and a cylindrical roller, characterized in that: A V-shaped annular groove is provided at one-half of the outer diameter of the outer ring along the circumferential direction of the outer diameter, and a plurality of circular grooves are provided with the groove bottom of the V-shaped annular groove as the center line, and the plurality of circular grooves are evenly distributed in the circumferential direction of the outer diameter of the outer ring; The processing technology includes an outer ring processing method, and the outer ring processing method includes The outer ring raceway is machined on the inner diameter of the outer ring; Marking is performed at positions close to the circular grooves so that the split semicircular grooves correspond to each other one by one; Cutting is performed at the bottom of the V-shaped ring groove, and three-point wire cutting is performed when the groove is cut to a certain size, and then the outer ring is pried open and split into two half outer rings by machining.

2. The process for processing a split cylindrical roller bearing according to claim 1, characterized in that: The cutting is performed at the bottom of the V-shaped ring groove. During the cutting, the total feed amount is 0.6 mm to 0.7 mm, and then the wire cutting is performed.

3. The process for processing a split cylindrical roller bearing according to claim 1, characterized in that: The specific method for performing three-point wire cutting includes selecting three circular grooves, determining a cutting line between each group of two adjacent circular grooves, the cutting line being tangent to the side of the two circular grooves away from the outer ring axis, and determining a total of three cutting lines, performing wire cutting based on the cutting lines, and retaining the V-shaped ring grooves in the three circular grooves without cutting.

4. A process for processing a split cylindrical roller bearing according to claim 3, characterized in that: The three cutting lines are in the form of an equilateral triangle.

5. The process for processing a split cylindrical roller bearing according to claim 1, characterized in that: The outer ring processing method comprises Dressing the grinding wheel, dressing the surface of the grinding wheel to form a surface of the outer ring raceway, wherein the surface of the outer ring raceway comprises a straight line segment and convexity segments symmetrically arranged on both sides of the straight line segment; The raceway of the outer ring is ground with the dressed grinding wheel.

6. The process for processing a split cylindrical roller bearing according to claim 1, characterized in that: The processing technology also includes an outer ring assembly method, the outer ring assembly method includes According to the marks, the corresponding relationship between the circular grooves on the two split half outer rings is determined, and they are assembled one by one.

7. A process for processing a split cylindrical roller bearing according to claim 6, characterized in that: When installing the clamping ring inside the circular groove, first install three clamping rings evenly distributed in the circumferential direction of the outer ring, and then install the other clamping rings.

8. The process for processing a split cylindrical roller bearing according to claim 1, characterized in that: Before cutting, the distance from the bottom of the V-shaped ring groove to the inner diameter is 1 mm to 1.5 mm.

9. A grinding wheel for machining split cylindrical roller bearings, characterized in that: The invention comprises a surface for machining an outer ring raceway, wherein the surface for machining an outer ring raceway comprises a straight line segment and convexity segments symmetrically arranged on both sides of the straight line segment.

10. A grinding wheel for machining split cylindrical roller bearings according to claim 9, characterized in that: The curvature of the convex section is 3μm to 5μm.

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