Bearing retainer demolding structure and method

Abstract

The invention relates to the technical field of retainer injection molds, and discloses a bearing retainer demolding structure and method.The male mold comprises a lower supporting base capable of ascending and descending, an arc-shaped groove is formed in the lower supporting base, a plurality of through grooves are evenly distributed in the arc-shaped groove, a positioning block is vertically arranged at each through groove, and the two sides of the top end of each positioning block are arranged to be inclined faces; each slope is in sliding fit with the inner side face of a sliding block, the bottom end of the sliding block abuts against the arc-shaped groove, and the outer side face of the sliding block is an arc-shaped face. The inner side surface of the through groove on the outer side of the inclined surface is parallel to and attached to the inclined surface; a centre hole is formed in the arc-shaped groove; the lower supporting seat ascends to drive the sliding blocks on the two sides of each group of positioning blocks to get close to each other in the process of sliding and ascending along the inclined surface, and the ejector pin ejects the retainer through the ejector pin hole to complete demolding; according to the structure, the problems that after the retainer is cast in a segmented mode, the core and the formed retainer section form an inverted buckling structure in the demolding direction, the R face can prevent the core from exiting, and if the R face is knocked forcibly, blank deformation, core edge breakage and even scrapping are extremely likely to happen can be solved.

Description

Technical Field

[0001] This invention relates to the field of cage injection mold technology, and in particular to a bearing cage demolding structure and method. Background Technology

[0002] Wind turbine main shaft bearings typically consist of an inner ring, an outer ring, rolling elements, and a cage. With the continuous increase in single-unit power, the outer diameter of the cage often reaches 1.5 m to 3 m or even larger. Due to the difficulties in feeding the molten metal, high internal stress in the blank, and uneven machining allowances associated with integral casting, the industry generally adopts a manufacturing route of "segmented casting – subsequent welding or bolting connection".

[0003] In the structural design of segmented cages, to improve the smoothness of roller insertion and reduce edge stress concentration, the two sides of the window beam need to be machined into continuous arc-shaped guide surfaces (R-surfaces). Correspondingly, the outer surface of the core used to form this arc-shaped surface in the casting mold must also be a continuous arc surface. However, it is precisely this arc-shaped surface that leads to the following two common industry challenges: 1. Demolding Interference: The curved surface mechanically engages with the window beam of the formed casting in the demolding direction. After the cage blank cools and shrinks, there is almost no gap between the window beam and the core. The core forms an "inverted" structure with the formed cage section in the demolding direction. The radius (R) surface will hinder the core from exiting, making it impossible to demold directly using conventional "vertical demolding" or "horizontal sliding" methods. If forcibly struck, it is very easy to cause deformation of the blank, chipping of the core, or even scrapping.

[0004] 2. Difficulty in replacing the core: Existing molds integrate the arc-shaped core with the mold body or use screws and pins for fixing. When the core cracks, wears, or loses material locally under high-frequency thermal shock, it must be taken off the production line for repair along with the mold body. Disassembly and reassembly take more than 2 hours. If the core is scrapped, the entire mold needs to be reprocessed, resulting in extremely high mold maintenance costs. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a bearing cage demolding structure and method. This structure can solve the problem that after segmented casting of the cage, the core forms an "inverted" structure with the formed cage segment in the demolding direction, and the R-surface will hinder the core from exiting. If forcibly struck, it is very easy to cause blank deformation, core chipping, or even scrap.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: In a first aspect, a bearing cage demolding structure includes a male mold, which includes a liftable lower support base. The lower support base has an arc-shaped groove, and several through slots are evenly distributed on the arc-shaped groove. A positioning block is vertically provided at each through slot. The two sides of the top position of the positioning block are set as inclined surfaces. Each inclined surface slides in cooperation with the inner side of the slider. The bottom end of the slider abuts against the arc-shaped groove, and the outer side of the slider is set as an arc-shaped surface. The inner side of the through slot outside the inclined surface is parallel to and fits against the inclined surface. An ejector pin hole is provided in the arc-shaped groove. As the lower support base rises, it drives the sliders on both sides of each group of positioning blocks to slide up along the inclined surface and move closer to each other. The ejector pins lift the cage through the ejector pin holes to complete the demolding.

[0007] As a further implementation, the lower support base is provided with multiple sets of arc-shaped grooves, and a casting channel is provided at the center of the lower support base, which is connected to the arc-shaped grooves.

[0008] As a further implementation, the first opposite side of the top position of the positioning block is set as an inclined surface, and the second opposite side of the positioning block is a planar structure; the two inclined surfaces on each group of positioning blocks approach each other from bottom to top; positioning blocks are set along the two sides of each group of inclined surfaces.

[0009] As a further implementation, the inner side of the slider slides in conjunction with the inclined surface, and the two sides of the inner side of the slider are provided with locking parts for locking with the positioning block.

[0010] As a further implementation, a slot is provided on the inner side of the slider near the top. The slot is recessed relative to the inner side of the slider, and the top of the slot is open and flush with the top of the slider.

[0011] As a further implementation, the top of the positioning block is provided with a limit block mounting groove, and a limit block can be detachably installed at the limit block mounting groove.

[0012] As a further implementation, the length of the limiting block is greater than the width of the bottom of the limiting block mounting groove, so that the end of the limiting block extends out of the inclined surface to abut against the slot.

[0013] As a further implementation, the pin hole is provided through the arc-shaped groove and is located on the periphery of the groove.

[0014] As a further implementation, the height of the slider is adapted to the height of the cage, and the height of the slider is adapted to the height of the positioning hole extending out of the through slot.

[0015] Secondly, a method for demolding a bearing cage, employing any of the bearing cage demolding structures described above, includes the following steps: After the cage is injection molded, the female mold rises, and then the lower support of the male mold rises. Through the arc groove, the slider is pushed to slide upward along the inclined surface of the positioning block, so that the two sliders on each set of positioning blocks approach each other during the rising process until the outer arc surface of the slider is unlocked from the cage. Then the ejector pin pushes the cage upward through the ejector pin hole. Finally, the lower support descends and the slider descends synchronously, realizing the demolding of the cage.

[0016] The beneficial effects of the present invention are as follows: This invention uses an arc-shaped groove, positioning blocks, sliders, and a lower support base. As the lower support base rises, it causes the sliders on both sides of each group of positioning blocks to slide and rise along the inclined plane, bringing them closer together. The ejector pins lift the retainer through the ejector pin holes to complete the demolding. This structure can solve the problem that after segmented casting of the retainer, the core forms an "inverted" structure with the already formed retainer section in the demolding direction. The R-surface will hinder the core from exiting. If it is forcibly struck, it is very easy to cause the blank to deform, the core to chip, or even scrap.

[0017] The limiting block and slot of this invention can limit the slider and prevent the slider from falling off the positioning block. The limiting block is detachably installed on the top of the positioning block, and the bottom end of the slider is in contact with the bottom of the arc groove. The slider is located above the arc groove. When the slider needs to be replaced, the limiting block can be removed and the slider can be taken out. The disassembly of the slider is not interfered with by the lower support seat, and the disassembly and installation are convenient.

[0018] Each set of lower support seats of the present invention is provided with two sets of arc-shaped grooves, which can be injection molded into two sections of retainer at one time. Attached Figure Description

[0019] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0020] Figure 1 This is a schematic diagram of the male mold portion of the bearing cage demolding structure in an embodiment of the present invention; Figure 2 yes Figure 1 A sectional view; Figure 3 This is a schematic diagram of the structure of the lower support base in an embodiment of the present invention; Figure 4 This is a schematic diagram of the cage structure in an embodiment of the present invention; Figure 5 This is a schematic diagram of the positioning block in an embodiment of the present invention; Figure 6 This is a schematic diagram of the slider structure in an embodiment of the present invention; Figure 7 This is a schematic diagram of the installation position of the limiting block in an embodiment of the present invention.

[0021] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0022] The components are: 1. cage, 2. lower support, 3. positioning block, 4. slider, 5. guide post, and 6. limit block. 11. Window opening beam; 12. Curved surface; 21. Curved groove; 22. Through groove; 23. Casting flow channel; 24. Guide post mounting hole; 25. Ejector pin hole; 31. Inclined surface; 32. Positioning block; 33. Limiting block mounting groove; 41. Curved surface; 42. Inner surface; 43. Snap-fit ​​part; 44. Snap-fit ​​groove. Detailed Implementation

[0023] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0024] Example 1 In a typical embodiment of the present invention, reference is made to Figures 1-7 As shown, a bearing cage demolding structure includes a male mold, which includes a liftable lower support base. The lower support base has an arc-shaped groove with several through slots evenly distributed on it. Each through slot has a vertically positioned positioning block. The top of the positioning block has two inclined surfaces on both sides. Each inclined surface slides into contact with the inner side of a slider. The bottom of the slider abuts against the arc-shaped groove, and the outer side of the slider is an arc-shaped surface. The inner side of the through slot outside the inclined surface is parallel to and fits against the inclined surface. The arc-shaped groove has ejector pin holes. As the lower support base rises, the sliders on both sides of each group of positioning blocks slide up along the inclined surface and move closer to each other. The ejector pins lift the cage through the ejector pin holes to complete the demolding.

[0025] like Figure 4 The diagram shows the segmented casting structure of a wind turbine bearing cage. The side of the window beam 11 of the wind turbine bearing cage forms an arc-shaped surface 12 (R surface) for mounting rollers. This R surface needs to be formed by a corresponding protruding core in the mold. The core forms an "overlapping" structure with the formed cage segment in the demolding direction. If an integral rigid mold is used, the core can only be pulled out in a straight line along the cage axis. The R surface will hinder the core from exiting, and forced demolding can easily damage the cage or even cause the thin-walled window beam to break.

[0026] To address the aforementioned problems, this embodiment provides a bearing cage demolding structure, such as... Figure 1 As shown in the figure, only the male mold is shown in this embodiment; the female mold is not shown. The cage demolding structure is arranged on the male mold.

[0027] like Figure 3As shown, the lower support 2 is provided with multiple sets of arc-shaped grooves 21, and the center of the lower support 2 is provided with a casting flow channel 23. The casting flow channel 23 is connected to the arc-shaped grooves 21. When the female mold descends and docks with the male mold, a cavity for casting retainer is formed at the position of the arc-shaped groove. The casting liquid can enter the cavity at the arc-shaped groove 21 from the casting flow channel 23 and form a retainer after cooling.

[0028] It is understood that the setting of the casting runner 23 and the female mold is not within the protection scope of this embodiment. As long as the female mold and the male mold of this embodiment can be connected to form the cavity of the casting retainer at the arc groove position, and the casting liquid can enter the arc groove 21 through the casting runner 23, it is acceptable.

[0029] This embodiment has two sets of arc-shaped grooves 21, which are arranged opposite to each other. The casting channel 23 is located in the middle position. The casting channel 23 can also be connected to the casting system. Specifically, the casting system can be connected by opening a hole at the bottom of the casting channel 23.

[0030] The dimensions of each set of arc-shaped grooves 21 are adapted to the dimensions of a section of retainer 1. Three through grooves 22 are evenly distributed on the arc-shaped grooves 21. The through grooves are set so that the positioning block 3 can pass through from bottom to top, so as to form the pocket of the retainer and the window beam.

[0031] like Figure 2 and Figure 5 As shown, the positioning block 3 is vertically arranged, with its top end above the lower support 2 and its bottom end below the lower support 2. Each set of arc-shaped grooves 21 cooperates with three positioning blocks 3, specifically, one positioning block 3 passes through one through groove 22.

[0032] The first opposite side of the upper half of the positioning block 3 is set as an inclined surface 31, and the second opposite side is a planar structure; in this embodiment, the inclined surface 31 is set on the left and right sides of the upper half of the positioning block 3, and the front and rear sides of the positioning block 3 are set as planar structures.

[0033] The two inclined surfaces 31 on each set of positioning blocks 3 approach each other from bottom to top; positioning blocks 32 are set along the two front and rear sides of each set of inclined surfaces 31. A limit block mounting groove 33 is provided at the center of the top surface of the positioning block 3, and a mounting hole is provided at the bottom of the groove for mounting the limit block 6.

[0034] like Figure 2 and Figure 6 As shown, each positioning block 3 extends upwards from the through groove 22, and a pair of sliders 4 are engaged on the left and right sides, specifically, one slider 4 is engaged on each side. The bottom of the slider 4 is always in contact with the bottom of the arc-shaped groove 21.

[0035] The outer surface of slider 4 is an arc-shaped surface 41, used to form the concave arc-shaped surface 12 of cage 1. The inner surface 42 of slider slides in contact with inclined surface 31. The front and rear sides of the inner surface 42 of slider are provided with locking parts 43, the shape of which matches the shape of positioning block 32. The state after locking is as follows: Figure 7 As shown, this allows slider 4 to slide up and down along inclined plane 31.

[0036] like Figure 2 As shown, when the support 2 is lowered, the distance between the bottom ends of each pair of sliders 4 is the same as the distance between the left and right sides of each through slot 22.

[0037] When the support 2 rises, the slider 4 can be pushed to slide upward along the inclined plane 31, so that each pair of sliders moves closer to each other until the maximum distance between the outer sides of each pair of sliders 4 is less than the minimum distance between each pocket of the retainer. At this time, the retainer 1 is pushed upward, and the retainer 1 can be unrestricted by the slider 4 and successfully complete demolding.

[0038] like Figure 6 As shown, a slot 44 is provided on the inner side 42 of the slider near the top. The slot 44 is recessed relative to the inner side of the slider. The slot is U-shaped, with an open top that is flush with the top of the slider 4.

[0039] Limit block 6 can be detachably installed at limit block mounting slot 33, such as Figure 7 As shown, the limiting block 6 is a block structure, and the limiting block 6 can be installed in the limiting block mounting groove 33 by screws and mounting holes.

[0040] The length of the limiting block 6 is greater than the width of the bottom of the limiting block mounting groove 33, so that the end of the limiting block 6 extends out of the inclined surface to abut against the slot 44.

[0041] When demolding, the lower support 2 drives the slider to slide along the inclined surface of the positioning block. When it slides to the designated position, the part of the limiting block 6 that extends out of the inclined surface can abut against the bottom of the slot 44, which can prevent the slider from disengaging from the positioning block 3 and achieve the function of limiting the slider.

[0042] like Figure 3 As shown, the ejector pin hole 25 is provided through the arc-shaped groove 21 and is located on the periphery of the through groove 22. The ejector pin passes through the ejector pin hole 25 from bottom to top, pushing the retainer, which can push the retainer upward from the arc-shaped groove 21.

[0043] like Figure 2 As shown, the lower support 2 is also provided with a guide post mounting hole 24 for mounting the guide post 5. The guide post 5 extends downward from the lower support 2. A fixed seat is also provided below the lower support 2. The fixed seat is provided with a guide hole. The fixed seat drives the lower support 2 to rise and fall through the telescopic mechanism. The guide post 5 cooperates with the guide hole to ensure that the lower support 2 can be raised and lowered vertically. The telescopic mechanism can be a hydraulic cylinder.

[0044] It is understood that in this embodiment, the height of slider 4 is adapted to the height of the cage, and the height of slider 4 is adapted to the height of the positioning hole extending out of the through slot, such as... Figure 2 As shown.

[0045] Example 2 A method for demolding a bearing cage, such as Figures 1-7 As shown, it adopts the bearing cage demolding structure described in Embodiment 1, including the following steps: The female mold descends and docks with the male mold, forming a segmented injection cavity for the retainer at the arc groove 21. The casting liquid is injected into the cavity through the casting runner 23. After cooling and molding, the female mold rises, and then the lower support of the male mold rises. Through the arc groove 21, the slider 4 is pushed to slide upward along the inclined surface 31 of the positioning block 3, so that the two sliders on each set of positioning blocks 3 approach each other during the rising process until the outer arc surface of the slider 4 is unlocked from the retainer. Then, the ejector pin pushes the retainer upward through the ejector pin hole 25. The ejector pin is a prior art technology and the lifting and lowering are achieved through a telescopic mechanism. Finally, the lower support 2 descends, and the slider 4 descends synchronously, realizing the demolding of the retainer 1.

[0046] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A bearing cage demolding structure, characterized in that, The mold includes a male mold, which includes a liftable lower support base. The lower support base has an arc-shaped groove with several through slots evenly distributed on it. Each through slot has a vertically positioned positioning block. The top of the positioning block has two inclined surfaces on both sides. Each inclined surface slides into contact with the inner side of the slider. The bottom of the slider abuts against the arc-shaped groove, and the outer side of the slider has an arc-shaped surface. The inner side of the through slot outside the inclined surface is parallel to and fits against the inclined surface. The arc-shaped groove has ejector pin holes. As the lower support base rises, it drives the sliders on both sides of each group of positioning blocks to slide up along the inclined surface and move closer to each other. The ejector pins lift the retainer through the ejector pin holes to complete the demolding.

2. The bearing cage demolding structure according to claim 1, characterized in that, The lower support base is provided with multiple sets of arc-shaped grooves, and a casting channel is provided at the center of the lower support base, which is connected to the arc-shaped grooves.

3. The bearing cage demolding structure according to claim 1, characterized in that, The first opposite side of the top position of the positioning block is set as an inclined surface, and the second opposite side of the positioning block is a planar structure; the two inclined surfaces on each group of positioning blocks approach each other from bottom to top; positioning blocks are set along the two sides of each group of inclined surfaces.

4. The bearing cage demolding structure according to claim 3, characterized in that, The inner side of the slider slides in conjunction with the inclined surface, and the two sides of the inner side of the slider are provided with locking parts for locking with the positioning block.

5. The bearing cage demolding structure according to claim 3, characterized in that, The inner side of the slider is provided with a groove near the top. The groove is recessed relative to the inner side of the slider, and the top of the groove is open and flush with the top of the slider.

6. The bearing cage demolding structure according to claim 5, characterized in that, The top of the positioning block is provided with a limit block mounting groove, and a limit block can be detachably installed at the limit block mounting groove.

7. A bearing cage demolding structure according to claim 6, characterized in that, The length of the limiting block is greater than the width of the bottom of the limiting block mounting groove, so that the end of the limiting block extends out of the inclined surface to abut against the slot.

8. The bearing cage demolding structure according to claim 1, characterized in that, The pin hole is provided through the arc-shaped groove and is located on the periphery of the groove.

9. A bearing cage demolding structure according to claim 1, characterized in that, The height of the slider is adapted to the height of the cage, and the height of the slider is adapted to the height of the positioning hole extending out of the through slot.

10. A method for demolding a bearing cage, characterized in that, The bearing cage demolding structure as described in any one of claims 1-9 includes the following steps: After the cage is injection molded, the female mold rises, and then the lower support of the male mold rises. Through the arc groove, the slider is pushed to slide upward along the inclined surface of the positioning block, so that the two sliders on each set of positioning blocks approach each other during the rising process until the outer arc surface of the slider is unlocked from the cage. Then the ejector pin pushes the cage upward through the ejector pin hole. Finally, the lower support descends and the slider descends synchronously, realizing the demolding of the cage.

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