Dustproof cover riveting mould repairing method
By optimizing the design of riveting and pressing tires and confirming the contact position by dyeing method, the problem of mismatch between dust cover and pressing tires during sealed ball bearing assembly is solved, and the quality and consistency of riveting pressure are improved.
Patent Information
- Application Number
- CN202411887100.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-04-11
AI Technical Summary
During the assembly process of sealed ball bearings, the dustproof cover and the rivet-pressing tire do not match, resulting in quality problems after the dustproof cover is riveted, such as sliding, uneven concave and curled edges not riveted into the sealing groove.
By analyzing the riveting process, the design of the riveting tire tool is optimized, and the contact position is confirmed by dyeing method to ensure the matching of the riveting tire tool and the dustproof cover.
It effectively avoids the problem of mismatch between the rivet and the dustproof cover, and improves the quality and consistency of the rivet and pressure of the dustproof cover.
Smart Images
Figure CN119808305A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a design mode of assembly equipment in a bearing component assembly process, in particular to a dust cover riveting mold rework method, and belongs to the technical field of bearing processing technology. Background Art
[0002] When assembling the sealed ball bearing, the dust cover needs to be pressed into the outer ring sealing groove through a riveting jig to complete the assembly of the dust cover.
[0003] However, various quality problems often occur after the dust cover is riveted, such as the dust cover sliding in the circumferential direction, the dust cover being uneven, the dust cover curling edge not being riveted into the sealing groove, etc. These problems are caused by the mismatch between the dust cover and the riveting jig, and the riveting jig needs to be repaired. Therefore, it is imperative to determine the repair method of the dust cover riveting jig. Summary of the invention
[0004] In order to solve the quality problem of sealed ball bearing riveting jig and dust cover after riveting, the present invention provides a dust cover riveting jig rework method, which reworks by re-optimizing the design of the riveting jig and determining the eligibility of the riveting jig through a dyeing method, thereby avoiding the problem of mismatch between the riveting jig and the dust cover.
[0005] In order to achieve the above object, the technical solution adopted by the present invention is: a dust cover riveting mold repair method, comprising the following steps: (1) Determine the unqualified factors of the riveting and pressing tire by analyzing the dust cover riveting and pressing process (2) Optimize the design and repair the unqualified riveting and pressing mold in step 1 (3) The contact position is confirmed by dyeing method through the optimized riveting jig, and the qualification of the riveting jig is determined by observing the dyeing of the dust cover.
[0006] Furthermore, the structures involved in the riveting process of the present scheme include: a bearing outer ring, a dust cover and a riveting jig; a sealing groove is provided on the inner diameter of the bearing outer ring near the end faces at both ends; the dust cover is a curling structure with a trapezoidal protrusion in the middle and two sides curled toward the center; during assembly, the dust cover needs to be riveted into the sealing groove of the bearing outer ring by a riveting jig; Furthermore, the structure of the riveting jig includes, from top to bottom, a pressure loading head at the top, a pressing portion cooperating with the dust cover, and a lower extension portion; the pressure loading head, the pressing portion, and the extension portion are integrated; when the dust cover is pressed, the pressing portion cooperating with the dust cover cooperates with the curling edge of the dust cover and contacts downwardly through the pressing portion cooperating with the dust cover, so that the curling edge of the dust cover is completely riveted into the sealing groove; Furthermore, the pressing portion cooperating with the dust cover includes: a 45° slope surface and a step surface connected to the outer side of the 45° slope surface.
[0007] Specifically, in the dust cover structure: R: small outer diameter of the dust cover at the curling edge, △: thickness of the dust cover plate, DF: nominal outer diameter of the dust cover; In the outer ring sealing groove structure: D3: sealing groove diameter; In the riveting jig structure: d1: diameter of the lower extension, Dg: inner diameter of the 45° slope surface, Dj: inner diameter of the step surface, Dm: outer diameter of the step surface, h: distance from the end point of the 45° slope surface to the step surface; Furthermore, the riveting process of the dust cover in step 1 is as follows: There is a gap between the outer ring seal groove diameter D3 and the dust cover outer diameter DF before riveting. The gap amount is the difference between the outer ring seal groove diameter and the dust cover outer diameter, that is, D3-DF; When the riveting jig is riveted downward, the 45° slope surface contacts the curled edge of the dust cover, so that the curled edge of the dust cover contacts the outer ring sealing groove diameter. In this process, the gap between the sealing groove diameter and the outer diameter of the dust cover disappears; The riveting jig continues to move downward, and at this time, the step surface of the riveting jig begins to contact the top of the dust cover curling edge to complete the riveting of the top of the dust cover curling edge; The riveting jig continues to move downward, and the dust cover curling edge is completely riveted into the sealing groove under the combined action of the step surface and the 45° slope surface of the riveting jig; The above riveting mold design formula is: Dj=Dm-2(△+R)+0.6 The 0.6 is artificially increased. When adjusting Dj, you only need to adjust the increase; h = 1.414x (△ + R) - 0.2; From the above-mentioned riveting process of the dust cover, it can be seen that the main factors affecting the riveting quality of the dust cover are the step surface and the 45° slope surface in the riveting jig; the relevant dimensions that affect these two parts in the riveting jig are Dj and Dg; combined with the on-site riveting quality results and the dyeing conditions, it is determined that the dimensions of Dj and Dg in the riveting jig are too large.
[0008] Furthermore, in step 2, since h=1.414x(△+R)-0.2, the slope angle is 45°, and there is a gap between the outer diameter of the dust cover and the sealing groove diameter, after comprehensive consideration, the optimized formula of the riveting mold is preliminarily determined: Dj=Dm-2(△+R)+0.2+(D3-DF);Dg=Dj-2h;Repair the riveting jig according to the above optimized formula to make Dj and Dg qualified.
[0009] Furthermore, in the step 3, the contact position is confirmed by dyeing after rework, the dust cover is placed on the outer ring, red is evenly applied on the 45° slope of the riveting jig, and then the riveting jig is placed on the dust cover, and the riveting jig is rotated clockwise for at least one circle. During the rotation, the riveting jig is rotated relative to the dust cover, and the riveting jig is removed to observe the dyeing of the dust cover curling edge; if there is red in the 45° direction and within the nearby 0.5mm area of the dust cover curling edge, it means that the contact position is correct and the riveting jig is qualified.
[0010] The above-mentioned riveting jig rotates at least one circle (360°) or even several times relative to the dust cover to prevent the dust cover from being dyed poorly. The more circles it rotates, the more it can ensure that the riveting jig and the dust cover can be in full contact, so that the dust cover can be dyed evenly.
[0011] The dust cover riveting mold repair method of the present invention has the following beneficial effects: The repair method of the present invention is essentially to re-optimize the design of the unqualified riveting jig; the key is to analyze the factors affecting the riveting quality of the dust cover through the riveting process of the dust cover, and combine the redesigned riveting jig and the dyeing method with the dust cover through theoretical analysis to confirm the contact position with the dust cover, and determine whether the riveting jig is optimized and qualified based on the dyeing area range of the dust cover, thereby avoiding the technical problem of mismatch between the riveting jig and the dust cover. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a structural diagram of the dust cover of the present invention.
[0013] Figure 2 This is a structural diagram of the outer ring of the sealed ball bearing of the present invention.
[0014] Figure 3 It is a structural diagram of the riveting and pressing mold of the present invention.
[0015] Figure 4 This is a diagram showing the structural status of the riveted front outer ring sealing groove, dust cover and riveted tire jig.
[0016] Figure 5 This is a diagram of the 45° inclined surface of the pressing part of the riveting jig and the pressing state of the dust cover during the riveting process.
[0017] Figure 6 This is a diagram showing the state where the step surface of the pressing part of the riveting jig begins to press against the dust cover during the riveting process.
[0018] Figure 7 This is the status picture after the dust cover is riveted.
[0019] Figure 8 Illustration of the contact area of the dust cover curling dye.
[0020] Fig. 9It is a working state diagram of the dust cover riveting jig and the dust cover dyeing of the present invention.
[0021] In the figure, 1, dust cover, 2, riveting jig, 3, outer ring sealing groove, 2.1, pressure loading head, 2.2, extension part, 2.3, 45° slope surface, 2.4, step surface, 4, contact area, 5, bearing outer ring, 6, bearing inner ring, 7, steel ball. DETAILED DESCRIPTION
[0022] 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.
[0023] A dust cover riveting mold repair method of the present invention comprises the following steps: (1) Determine the unqualified factors of the riveting and pressing tire by analyzing the dust cover riveting and pressing process (2) Optimize the design and repair the unqualified riveting and pressing mold in step 1 (3) The contact position is confirmed by dyeing method using the optimized riveting jig, and the riveting jig 2 is determined to be qualified by observing the dyeing condition of the dust cover 1.
[0024] The structures involved in the riveting process of this scheme include: a bearing outer ring, a dust cover 1 and a riveting jig 2; a sealing groove 3 is provided near the end faces of both ends of the inner diameter of the bearing outer ring; the dust cover 1 is a curling structure with a trapezoidal protrusion in the middle and two sides curled toward the center; during assembly, the dust cover 1 needs to be riveted into the sealing groove 3 of the bearing outer ring by the riveting jig 2; The structure of the riveting jig 2 includes, from top to bottom, a pressure loading head 2.1 at the top, a pressing portion cooperating with the dust cover 1, and a lower extension portion 2.2; the pressure loading head 2.1, the pressing portion, and the extension portion 2.2 are integrated; when the dust cover 1 is pressed, the pressing portion cooperating with the dust cover cooperates with the curling edge of the dust cover 1 and contacts downwardly, so that the curling edge of the dust cover 1 is completely riveted into the sealing groove 3; The pressing portion matched with the dust cover comprises: a 45° slope surface 2.3 and a step surface 2.4 connected to the outer side of the 45° slope surface.
[0025] It should be noted that the riveting jig 2 in this solution is a bearing that has been assembled by riveting; wherein the extension portion 2.2 corresponds to the inner diameter of the inner ring 6 of the bearing when the riveting jig 2 presses the dust cover 1, plays the role of fixing the jig, and is an action in the pressing process. The extension portion 2.2 does not participate in the rework step; Specifically, in the structure of the dust cover 1, R: small outer diameter of the dust cover at the curling edge, △: thickness of the dust cover, DF: nominal outer diameter of the dust cover; Figure 1 As shown; In the outer ring structure: D3: the diameter of the sealing groove; Figure 2 As shown; In the structure of the riveting jig 2, d1 is the diameter of the lower extension, Dg is the inner diameter of the 45° slope surface, Dj is the inner diameter of the step surface, Dm is the outer diameter of the step surface, and h is the distance from the end point of the 45° slope surface to the step surface; Figure 3 As shown; The process of riveting the dust cover in step 1 is as follows: There is a gap between the outer ring seal groove diameter D3 and the dust cover outer diameter DF before riveting. The gap is the difference between the outer ring seal groove diameter and the dust cover outer diameter, that is, D3-DF. See the structure for details. Figure 4 As shown; When the riveting jig 2 is riveted downward, the 45° slope surface 2.3 contacts the curling edge of the dust cover 1, so that the curling edge of the dust cover 1 contacts the outer ring sealing groove 3 diameter. In this process, the gap between the sealing groove diameter and the outer diameter of the dust cover disappears. The specific structure is as follows: Figure 5 As shown; The riveting jig 2 continues to move downward, and the step surface 2.4 of the riveting jig 2 begins to contact the top of the curling edge of the dust cover 1 to complete the riveting of the top of the curling edge of the dust cover 1; the specific structure is as follows Figure 6 As shown; The riveting jig 2 continues to move downward, and the dust cover 1 is completely riveted into the sealing groove 3 under the combined action of the step surface 2.4 and the 45° slope surface 2.4 of the riveting jig. The specific structure is as follows: Figure 7 As shown; The above riveting mold design formula is: Dj=Dm-2(△+R)+0.6 The 0.6 is artificially increased. When adjusting Dj, you only need to adjust the increase; h = 1.414x (△ + R) - 0.2; From the above-mentioned riveting process of the dust cover, it can be seen that the main factors affecting the riveting quality of the dust cover are the step surface 2.4 and the 45° slope surface 2.3 in the riveting jig; the relevant dimensions affecting these two parts in the riveting jig are Dj and Dg; combined with the on-site riveting quality results and the dyeing conditions, it is determined that the dimensions of Dj and Dg in the riveting jig are too large.
[0026] In step 2, since h=1.414x(△+R)-0.2, the slope angle is 45°, and there is a gap between the outer diameter of the dust cover 1 and the diameter of the sealing groove 3, after comprehensive consideration, the optimized formula of the riveting mold is preliminarily determined: Dj=Dm-2(△+R)+0.2+(D3-DF);Dg=Dj-2h;Repair the riveting jig 2 according to the above optimized formula to make Dj and Dg qualified.
[0027] In the step 3, the contact position is confirmed by dyeing after rework, the dust cover 1 is placed on the outer ring, and red is evenly applied to the 45° slope 2.3 of the riveting jig, and then the riveting jig 2 is placed on the dust cover 1, and the riveting jig 2 is rotated clockwise for at least one circle. During the rotation, the riveting jig 2 is rotated relative to the dust cover, and the riveting jig 2 is removed to observe the dyeing of the dust cover 1 curling; if there is red in the 0.5mm contact area 4 in the 45° direction and nearby of the dust cover 1 curling, it means that the contact position is correct and the riveting jig 2 is qualified; see for details Figure 8 shown.
[0028] It should be noted that the above-mentioned riveting jig rotates at least one circle (360°) or even several times relative to the dust cover to prevent the dust cover from being poorly dyed. The more circles it rotates, the more it can ensure that the riveting jig can fully contact with the dust cover, so that the dust cover can be dyed evenly.
[0029] The key point of the present invention is to analyze the factors affecting the riveting quality of the dust cover through the riveting process of the dust cover, and determine the riveting mold repair method matching the dust cover by combining theoretical analysis and dyeing method.
Claims
1. A dust cover riveting mold repair method, characterized in that: The steps include: (1) Determine the unqualified factors of the riveting and pressing tire by analyzing the dust cover riveting and pressing process; (2) Optimize the design and repair the unqualified riveting and pressing jig in step 1; (3) The contact position is confirmed by dyeing the optimized riveting jig, and the qualification of the riveting jig is determined by observing the dyeing of the dust cover.
2. A dust cover riveting jig repair method according to claim 1, characterized in that: The structures involved in the riveting process include: a bearing outer ring, a dust cover and a riveting jig; a sealing groove is provided on the inner diameter of the bearing outer ring near the end faces at both ends; the dust cover is a curled edge structure with a trapezoidal protrusion in the middle and both sides curled toward the center; during assembly, the dust cover needs to be riveted into the sealing groove of the bearing outer ring by a riveting jig.
3. A dust cover riveting jig repair method according to claim 2, characterized in that: The structure of the riveting jig includes, from top to bottom, a pressure loading head at the top, a pressing portion cooperating with the dust cover, and a lower extension portion; the pressure loading head, the pressing portion, and the extension portion are integrated; when the dust cover is pressed, the pressing portion cooperating with the dust cover cooperates with the curled edge of the dust cover and squeezes downward to contact, so that the curled edge of the dust cover is completely riveted into the sealing groove.
4. A dust cover riveting jig repair method according to claim 3, characterized in that: The pressing portion matched with the dust cover comprises: a 45° slope surface and a step surface connected to the outer side of the 45° slope surface.
5. A dust cover riveting jig repair method according to claim 4, characterized in that: In the riveting jig structure: Dg: inner diameter of the 45° slope surface, Dj: inner diameter of the step surface, Dm: outer diameter of the step surface, h: distance from the end point of the 45° slope surface to the step surface.
6. A dust cover riveting jig repair method according to claim 5, characterized in that: The process of riveting the dust cover in step 1 is as follows: There is a gap between the outer ring seal groove diameter and the outer diameter of the dust cover before riveting. The gap amount is the difference between the outer ring seal groove diameter and the outer diameter of the dust cover, that is, D3-DF; When the riveting jig is riveted downward, the 45° slope surface contacts the dust cover curling edge, so that the dust cover curling edge contacts the outer ring sealing groove diameter. In this process, the gap between the sealing groove diameter and the outer diameter of the dust cover disappears; the riveting jig continues to move downward, and at this time, the step surface of the riveting jig begins to contact the top of the dust cover curling edge to complete the riveting of the top of the dust cover curling edge; The riveting jig continues to move downward, and the dust cover curling edge is completely riveted into the sealing groove under the combined action of the step surface and the 45° slope surface of the riveting jig; the design formula of the above-mentioned riveting jig is: Dj=Dm-2(△+R)+0.6; the dimensions of Dj and Dg in the riveting jig are too large.
7. A dust cover riveting jig repair method according to claim 6, characterized in that: In the step 2, the optimized formula of the riveting jig is determined: Dj=Dm-2(△+R)+0.2+(D3-DF); Dg=Dj-2h; the riveting jig is repaired according to the above optimized formula to make Dj and Dg qualified.
8. A dust cover riveting jig repair method according to claim 7, characterized in that: In the step 3, after rework, the contact position is confirmed by dyeing method, the dust cover is placed on the outer ring, red is evenly applied on the 45° slope of the riveting jig, and then the riveting jig is placed on the dust cover, and the riveting jig is rotated for at least one week. During the rotation, the riveting jig is rotated relative to the dust cover, and the riveting jig is removed to observe the dyeing of the dust cover curling edge; if there is red in the 45° direction of the dust cover curling edge and within the vicinity of the 0.5mm area, it means that the contact position is correct and the riveting jig is qualified.