Production process and die for retainer with double-end-ring bent edges

Abstract

The invention discloses a double-end-ring bent edge retainer production process and a die. A stretching and bottom cutting integrated forming die is used for carrying out stretching and bottom cutting operation on a circular blank disc, so that the circular blank disc is deformed into a semi-finished product with an inverted bowl-shaped structure, the semi-finished product is transferred to a straightening and shaping die, an inner turned edge formed in the previous step is corrected, and the retainer with the double-end-ring bent edge is obtained. Vertical to the horizontal reference surface; meanwhile, the flanging is adjusted to be parallel to the horizontal plane; a trimming die is used for accurately adjusting the length of the outer flanging on the lower side; an upper port part of the bowl-shaped structure is preliminarily bent by the aid of a pre-flanging die to form a flanging with a certain preset angle, the preliminarily bent part is further bent by the aid of a flanging die until the preliminarily bent part is completely parallel to the horizontal plane to form a stable upper side outer flanging, and the retainer with the double-end ring bent edges is produced by the aid of a multi-step stamping process. And the production speed is high, a plurality of parts can be continuously and rapidly machined, and the time for waiting for cooling or curing is not needed.

Description

Technical Field

[0001] The present application belongs to the field of bearing manufacturing, and in particular relates to a production process and a mold for a cage with double-end ring bending edges. Background Art

[0002] The core function of the cylindrical cage, as a key component of the bearing, is to firmly place and guide the rolling elements (such as rollers) between the inner and outer rings of the bearing to achieve smooth and stable rotation. The design ingeniously combines the two end rings with the window beam structure evenly distributed between them, together forming an efficient support system.

[0003] In order to significantly improve the structural robustness and overall load-bearing strength of the cylindrical cage, an innovative design was developed, which is to design the end ring to be turned outward toward the center of the circle. This unique design not only strengthens the basic structure of the cage, but also greatly improves its ability to resist external stress and deformation, thereby ensuring stable operation under high load or complex working conditions. In addition, the outer flange design also promotes seamless integration and high-strength connection between various components, further improving the overall performance.

[0004] However, although the external flange design brings significant structural advantages, its unique shape also brings challenges to the manufacturing process. Although traditional processing methods such as die casting or injection molding can realize this design, longer cooling and solidification time is required during the molding process to ensure the shape and dimensional accuracy of the cage. This will increase the cycle time of the entire production process and reduce production efficiency. The external flange design makes the edges and contours of the cage more complex, increasing the difficulty of grinding. In order to ensure surface finish and dimensional accuracy, more sophisticated grinding tools and longer grinding time may be required. Due to the complexity of processing and treatment, cages with external flanges on both ends of the cage are more likely to produce scrap during the production process. The increase in scrap rate not only increases production costs, but also affects production efficiency and product quality stability. Therefore, exploring more efficient and economical manufacturing processes to overcome these shortcomings is an important issue that needs to be urgently solved in the current cylindrical cage manufacturing field. It can be seen that the existing technology needs to be further improved and improved. Summary of the invention

[0005] The present invention provides a production process and a mold for a retainer with double-end ring bending edges, so as to at least solve or alleviate one or more technical problems in the prior art, or at least provide a beneficial choice.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A production process for a double-end ring bent edge retainer comprises the following steps:

[0008] Step 1: Use high-precision punching equipment to accurately cut the raw materials to form a round blank disk that meets the design specifications, ensuring that the blank size accuracy and surface quality meet the subsequent processing requirements;

[0009] Step 2: Use a stretching and bottom cutting integrated forming die to stretch and bottom cut the circular blank disc, so that it is deformed into a semi-finished product with an inverted bowl-shaped structure, forming an inner turning edge of the upper end of the bowl toward the center of the circle and an outer turning edge of the lower end of the bowl away from the center of the circle;

[0010] Step 3: Transfer the semi-finished product to the straightening and shaping mold, and correct the inner flange formed in the previous step to make it perpendicular to the horizontal reference plane; at the same time, adjust the outer flange to be parallel to the horizontal plane;

[0011] Step 4: Use the trimming die to accurately adjust the length of the lower outer flange to meet the dimensional tolerance requirements in the design specifications and ensure the consistency and aesthetics of the outer flange;

[0012] Step 5: With the help of a pre-flanging die, the upper end portion of the bowl-shaped structure is preliminarily bent to form a folded edge with a certain preset angle;

[0013] Step 6: Use a flanging die to further bend the initially bent portion until it is completely parallel to the horizontal plane to form a stable upper outer flanging;

[0014] Step 7: Finally, use the window punching die to perform precise window hole processing in the blank area between the upper and lower side flanges, and finally complete the entire processing process of the cage.

[0015] The double-end ring bending edge retainer production process of the present application adopts a multi-step stamping process to produce the double-end ring bending edge retainer. Compared with the traditional injection molding or die-casting method, it has a faster production speed and can continuously and quickly process multiple parts without waiting for cooling or curing time. In contrast, the injection molding and die-casting processes require a longer cooling and curing cycle, which reduces the overall production efficiency; the stamping process can more accurately control the shape and size of the parts, especially for the double-end ring bending edge design, which can achieve high-precision processing and ensure the dimensional accuracy and surface quality of the retainer. Through strict mold design and control, the consistency of each part can be ensured. The double-end ring bent edge cage processed by this production process can form high-strength connections and bent edges, improve the overall load-bearing capacity and stability of the cage, and meet the use requirements under high load or complex working conditions. The stamping process has a low scrap rate, so the production cost of a single part is low. Compared with injection molding or die-casting processes, the stamping process does not require additional cooling and curing equipment, and also reduces energy consumption and scrap disposal costs. In addition, the stamping process has high flexibility and can quickly adjust the mold to adapt to the production of cages of different specifications and shapes, which is particularly beneficial for the production of multiple varieties.

[0016] In a preferred implementation, a smooth arc transition section is formed between the inner and outer flanges in step 2 and the bowl-shaped middle section.

[0017] The arc transition design can enhance the connection strength between the inner and outer flanges and the bowl-shaped middle section. Through the smooth transition, the connection part can more effectively transfer and disperse the load, avoiding connection failure caused by stress concentration.

[0018] In a preferred implementation, after the straightening and shaping in step 3, the arc transition section is eliminated.

[0019] The upper and lower arc transition sections are punched and stretched at the same time, and the stretching directions are opposite. During the stretching process, the material will flow along the stretching direction. Since the stretching forces are opposite, the material will flow more evenly on both sides of the middle section of the bowl section instead of leaning to one side, which helps to make the overall thickness of the middle section of the bowl section more uniform.

[0020] In a preferred implementation, the length of the upper outer flange formed in step 6 is consistent with the length of the lower outer flange formed in step 4.

[0021] When the trimming die is used to precisely adjust the lower outer flange and the length of the upper outer flange is precisely controlled by the pre-flange die, the need for subsequent flanging or other adjustment processes is avoided. This not only reduces the production process, but also shortens the production cycle and significantly improves production efficiency.

[0022] In a preferred implementation, the angle between the folded edge formed in step 5 and the horizontal plane is 45°.

[0023] In a preferred implementation, the pre-flanging mold in step 5 and the flanging mold in step 6, the end of the male mold part of the mold is a guide section that can extend into the interior of the blank, the upper part of the guide section is a flanging section with a flanging angle, the guide section first enters the interior of the blank and abuts the inner wall of the blank, the female mold part of the mold is composed of a plurality of movable split female molds, the split female molds include a supporting flanging section and an abutting section and an avoidance section thereunder, the supporting flanging section cooperates with the flanging section to provide support for the flanging of the blank during the flanging process, the split female mold moves radially during the flanging process to combine into a complete female mold structure, the abutting section fits the outer wall of the blank, and the lower outer flanging formed in step 2 is located in the avoidance section; as the male mold part continues to descend, the upper port part of the blank is flanging along the preset flanging direction and angle.

[0024] A mold for producing a retainer with double-end ring bent edges, comprising a stretching and bottom cutting integrated molding mold, a straightening and shaping mold, a trimming mold, a pre-flanging mold, a flanging mold and a window punching mold; the stretching and bottom cutting integrated molding mold can simultaneously realize the bowl-shaped molding and bowl-bottom cutting operations of the blank so that the upper end of the bowl-shaped blank forms an inner flanging edge, and the lower end of the bowl-shaped blank forms an outer flanging edge; the straightening and shaping mold straightens and shapes the inner flanging edge and the outer flanging edge so that the inner flanging edge is perpendicular to the horizontal plane and the outer flanging edge is parallel to the horizontal plane; the trimming mold trims the lower outer flanging edge to adjust the length; the pre-flanging mold preliminarily bends the upper end of the bowl-shaped structure to form an angled flanging edge, and the flanging mold bends the preliminarily bent flanging edge to a horizontal state; the punching mold punches a window hole in the middle section of the blank between the upper outer flanging edge and the lower outer flanging edge.

[0025] In a preferred implementation, the stretching and bottom cutting integrated forming mold is composed of four major components: a stretching die, a stretching punch, a pressure ring and a punching punch; a discharge channel is provided in the center of the stretching punch, and the pressure ring is arranged around it, with two pressing positions: initial and forming; initially, the pressure ring is flush with the top of the stretching punch to form a horizontal plane for placing the blank, and as the stretching die moves downward, the edge of the blank is clamped between the pressure ring and the stretching die, and the stretching punch supports the center of the blank to enter the forming cavity of the stretching die, gradually forming an inverted bowl-shaped structure; the punching punch in the center of the stretching die simultaneously moves down to penetrate the center of the forming blank to complete the punching and bottom cutting of the bowl bottom.

[0026] In a preferred implementation, the pre-flanging mold and the upper mold assembly of the flanging mold are both provided with a pressure column, a first inclined surface is arranged at the bottom of the pressure column, the pre-flanging mold and the lower mold assembly of the flanging mold are provided with a center positioning column and an inclined block which can move radially around the center positioning column, a second inclined surface is arranged on the side of the inclined block away from the positioning column, the length of the inclined block pressure column is greater than the length of the pre-flanging mold and the male mold part of the flanging mold, the inclined block pressure column descends with the male mold part, the inclined surface of the pressure column abuts against the inclined surface of the inclined block, and the interaction causes the inclined block to move toward the positioning column, so that it can abut against the outer wall of the blank.

[0027] In a preferred implementation, the side of the inclined block facing the center positioning column from top to bottom comprises a bending guide surface, a contact arc surface and a concave avoidance surface. The contact arc surface can fit tightly with the outer wall of the blank, and the bending guide surface cooperates with the punch part as a support surface for the bending edge to guide the blank to bend to a preset angle, and the concave avoidance surface avoids the outer flange formed on the lower side. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present application and do not constitute an improper limitation of the present invention. In the drawings:

[0029] Figure 1 A production process flow chart of a cage with double-end ring bending edges of the present application is shown;

[0030] Figure 2 A schematic structural view of the initial state of the stretching and bottom cutting integrated molding die of the present application is depicted;

[0031] Figure 3 A schematic structural view of the processing state of the stretching and bottom cutting integrated forming die of the present application is depicted;

[0032] Figure 4 A schematic structural view of the straightening and shaping die processing state of the present application is depicted;

[0033] Figure 5 A schematic structural view of the trimming die processing state of the present application is depicted;

[0034] Figure 6 A schematic structural view of the initial state of the pre-flanging die of the present application is depicted;

[0035] Figure 7 A schematic structural view of the pre-flanging die processing state of the present application is depicted;

[0036] Figure 8 A schematic structural view of the initial state of the flanging die of the present application is depicted;

[0037] Fig. 9 A schematic structural view of the flanging die processing state of the present application is depicted;

[0038] Fig.10 A schematic structural view of the processing state of the window punching die of the present application is depicted;

[0039] Description of labels:

[0040] 10-stretching die; 11-stretching punch; 110-discharge channel; 12-punching punch; 13-pressure ring; 14-thrust rod; 15-pressure plate; 16-spring; 17-inner stripper plate; 20-lower outer flange; 21-inner flange; 22-arc transition section; 30-shaping die; 31-shaping punch; 40-trimming die; 41-trimming punch; 50-pre-flanging punch; 500-flanging section; 501-pilot section; 51-oblique block; 510-bending guide surface; 511-second inclined surface; 512-inner concave avoidance surface; 513-contact arc surface; 52-pressure column; 520-first inclined surface; 53-center positioning column; 54-flanging punch; 60-punch; 61-punching die; 62-locking cone; 63-equally divided wheel. DETAILED DESCRIPTION

[0041] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit and scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0042] The present invention will be described below in conjunction with the accompanying drawings.

[0043] The specific plans adopted are:

[0044] like Figure 1 As shown, the present invention provides a production process for a retainer with double-end ring bending edges, comprising the following steps:

[0045] Step 1: Use high-precision punching equipment to accurately cut the raw materials to form a round blank disk that meets the design specifications, ensuring that the blank size accuracy and surface quality meet the subsequent processing requirements;

[0046] Step 2: Use a stretching and bottom cutting integrated forming die to stretch and bottom cut the circular blank disc, so that it is deformed into a semi-finished product with an inverted bowl-shaped structure, forming an inner flange 21 of the upper end of the bowl toward the center of the circle and an outer flange of the lower end of the bowl away from the center of the circle;

[0047] Step 3: Transfer the semi-finished product to the straightening and shaping mold, and correct the inner flange formed in the previous step to make it perpendicular to the horizontal reference plane; at the same time, adjust the outer flange to be parallel to the horizontal plane;

[0048] Step 4: Use a trimming die to precisely adjust the length of the lower outer flange 20 to meet the dimensional tolerance requirements in the design specifications and ensure the consistency and aesthetics of the outer flange;

[0049] Step 5: With the help of a pre-flanging die, the upper end portion of the bowl-shaped structure is preliminarily bent to form a folded edge with a certain preset angle;

[0050] Step 6: Use a flanging die to further bend the initially bent portion until it is completely parallel to the horizontal plane, forming a stable upper outer flanging 20;

[0051] Step 7: Finally, use the window punching die to perform precise window hole processing in the blank area between the upper and lower side flanges, and finally complete the entire processing process of the cage.

[0052] The above structure uses a multi-step stamping process to produce a double-end ring bending edge retainer. Compared with traditional injection molding or die casting, it has many significant advantages. The stamping process has a faster production speed and can continuously and quickly process multiple parts without waiting for cooling or curing time. In contrast, injection molding and die casting processes require a longer cooling and curing cycle, which reduces the overall production efficiency; the stamping process can more accurately control the shape and size of the parts, especially for the double-end ring bending edge design, which can achieve high-precision processing and ensure the dimensional accuracy and surface quality of the retainer. Through strict mold design and control, the consistency of each part can be ensured. The double-end ring bent edge cage processed by this production process can form high-strength connections and bent edges, improve the overall load-bearing capacity and stability of the cage, and meet the use requirements under high load or complex working conditions. The stamping process has a low scrap rate, so the production cost of a single part is low. Compared with injection molding or die-casting processes, the stamping process does not require additional cooling and curing equipment, and also reduces energy consumption and scrap disposal costs. In addition, the stamping process has high flexibility and can quickly adjust the mold to adapt to the production of cages of different specifications and shapes, which is particularly beneficial for the production of multiple varieties.

[0053] As a preferred embodiment of the present application, see Figure 2 A smooth arc transition section 22 is formed between the inner and outer flanges in step 2 and the bowl-shaped middle section. The arc transition design can make the stress more evenly distributed at the connection part, avoiding the concentration of stress at right angles or sharp edges. The arc transition design can enhance the connection strength between the inner and outer flanges and the bowl-shaped middle section. Through the smooth transition, the connection part can more effectively transfer and disperse the load, avoiding the connection failure caused by stress concentration.

[0054] For further information, see Figure 3 After the straightening and shaping in step 3, the arc transition section 22 is eliminated. The upper and lower arc transition sections are punched and stretched at the same time, and the stretching directions are opposite. During the stretching process, the material will flow along the stretching direction. Since the stretching force is opposite, the material will flow more evenly on both sides of the middle section of the bowl section without leaning to one side, which helps to make the overall thickness of the middle section of the bowl section more uniform. If the thickness is uneven, it will be easier to generate stress concentration during the subsequent flanging process. For example, if the upper side is thicker, it may be more difficult to deform, while if it is thinner, it may be more prone to plastic deformation or even fracture.

[0055] As a preferred embodiment of the present application, the length of the upper outer flange formed in step 6 is consistent with that of the lower outer flange formed in step 4, and the lower outer flange 20 is precisely adjusted by a trimming die. At the same time, when the length of the upper outer flange is precisely controlled by the pre-flanging die, the need for subsequent flanging to be machined or other adjustment processes is avoided. This not only reduces the production process, but also shortens the production cycle and significantly improves production efficiency. In mass production, this efficiency improvement is particularly obvious, which helps companies reduce costs and improve market competitiveness. The precise control of the mold ensures the consistency of the lengths of the upper and lower flanges, thereby improving the overall accuracy and balance of the cage body. This consistency is crucial to the dynamic performance and stability of the cage in the bearing, and helps to reduce vibration, reduce noise, and improve the rotation accuracy and life of the bearing.

[0056] As a preferred embodiment of the present application, the angle between the folded edge formed in step 5 and the horizontal plane is 45°, and the folding is continued to be parallel to the horizontal plane in the subsequent process, so that in the flanging process of the upper outer folding edge, a continuous change from 0° to 90°, then to 135°, and finally to 180° is actually formed, and the folding is gradually parallel to the horizontal plane. This continuous angle change helps the material flow more evenly during the flanging process. Compared with sudden large-angle flanging, this gradual flanging method can reduce stress concentration inside the material and avoid the generation of cracks and fractures.

[0057] See also Figure 6-9 , the pre-flanging mold of step 5 and the flanging mold of step 6, the end of the male mold part of the mold is a leading section 501 that can extend into the interior of the blank, the upper part of the leading section is a flanging section 500 with a flanging angle, wherein the flanging section of the pre-flanging mold is an inclined angle surface section, and the flanging section of the flanging mold is a right-angle step surface section, and the leading section first enters the interior of the blank and abuts against the inner wall of the blank;

[0058] The bending path of the blank can be accurately planned by pre-positioning and guiding the leading section 501 and gradually flanging the flanging section 500. This design effectively avoids the possibility of the blank bending inward during the flanging process and ensures the accuracy and consistency of the flanging direction.

[0059] The die portion of the mold is composed of a plurality of movable split dies, the split dies including a supporting flanging section and an abutting section and an avoidance section thereunder. The supporting flanging section cooperates with the flanging section to provide support for the flanging of the blank during the flanging process. The split dies move radially during the flanging process to combine into a complete die structure, and the abutting section fits the outer wall of the blank. The lower outer flange 20 formed in step 2 is located in the avoidance section. As the punch portion continues to descend, the upper port portion of the blank is flanging along a preset flanging direction and angle.

[0060] See also Figure 2-10, a mold for producing a retainer with double-end ring bent edges, including a stretching and bottom cutting integrated molding mold, a straightening and shaping mold, a trimming mold, a pre-flanging mold, a flanging mold and a window punching mold; the stretching and bottom cutting integrated molding mold can simultaneously realize the bowl-shaped molding and bowl bottom cutting operations of the blank, so that the upper end of the bowl-shaped blank forms an inner flanging edge, and the lower end of the bowl-shaped blank forms an outer flanging edge; the straightening and shaping mold straightens and shapes the inner flanging edge and the outer flanging edge, so that the inner flanging edge is perpendicular to the horizontal plane, and the outer flanging edge is parallel to the horizontal plane; the trimming mold trims the lower outer flanging edge to adjust the length; the pre-flanging mold preliminarily bends the upper end of the bowl-shaped structure to form an angled flanging edge, and the flanging mold bends the preliminarily bent flanging edge to a horizontal level; the window punching mold punches a window hole in the middle section of the blank between the upper outer flanging edge and the lower outer flanging edge.

[0061] Among them, see Figure 2 and Figure 3 The stretching and bottom cutting integrated forming mold is composed of four major components: a stretching die 10, a stretching punch 11, a pressure ring 13 and a punching punch 12; a discharge channel 110 is provided in the center of the stretching punch, and the pressure ring 13 is arranged around it, with two pressing positions: initial and forming; initially, the pressure ring is flush with the top of the stretching punch 11 to form a horizontal plane for placing the blank, and as the stretching die moves downward, the edge of the blank is clamped between the pressure ring 13 and the stretching die 10, and the stretching punch supports the center of the blank to enter the stretching die forming cavity, gradually forming an inverted bowl-shaped structure; the punching punch 12 in the center of the stretching die moves down synchronously to penetrate the center of the forming blank to complete the punching and bottom cutting of the bowl bottom, and the bottom of the pressure ring is connected to the push rod 14, and the push rod 14 passes through the lower die seat to connect the pressure plate 15, and the pressure plate is connected to one end of the spring 16, and the other end of the spring is connected to the fixed plate. The above structure can make the pressure ring return from the forming pressing position to the initial pressing position when the stretching die rises.

[0062] At the same time, when the stretching die and the punching punch begin to press down for forming and punching, the inner stripper plate 17 will first contact the blank at the edge of the punching area. As the stretching die 10 continues to press down the edge holding ring 13, the stretching punch 11 gradually emerges and enters the inner forming cavity, pushing the inner stripper plate. The inner stripper plate moves through the movable structure thereon and can only rise to a certain height, that is, the limiting position of the edge of the blank. At this time, the inner stripper plate tightly presses the edge of the blank to achieve punching. After completing the forming and bottom cutting operation, when the stretching die rises, the inner stripper plate can move downward, thereby pushing the blank lifted by the punching punch to fall after the forming process.

[0063] See also Figure 4, the bowl-shaped blank is carefully transferred to the straightening and shaping mold. This mold consists of a shaping die 30, a shaping punch 31, and a blank holder assembly with the same principle as the stretching and bottom cutting integration. The difference is that the blank holder is located on the lower side of the upper surface of the shaping punch in the initial position, and the bowl-shaped blank is directly placed on the shaping punch. At this time, the inner flange and the upper arc transition section can be placed on the upper surface of the shaping punch, while the lower outer flange and the lower arc transition section are placed on the blank holder. The shaping die 30 begins to descend, and it will contact the lower arc transition section and the lower outer flange of the bowl-shaped blank, exerting pressure on the lower arc transition section and the lower outer flange, driving them to stretch and descend. At the same time, due to the support of the shaping punch, the inner flange and the upper arc transition section will also be subjected to the force of stretching and shaping. During this process, the inner flange 21 and the upper arc transition section 22 will be straightened to make their shapes more regular and smooth. As the shaping die descends further, the lower arc transition section will be rolled between the shaping die and the lower die seat to form a right-angle transition, which also eliminates the lower arc transition section. The above-mentioned blank is then transferred to the trimming die, and the blank is fixed by the positioning structure in the center of the trimming die. The trimming punch 41 and the trimming die 40 realize trimming, and the lower outer flange is formed.

[0064] See also Figure 6-9 The pre-flanging mold and the upper mold assembly of the flanging mold are both provided with a pressure column 52, and a first inclined surface 520 is arranged at the bottom of the pressure column. The pre-flanging mold and the lower mold assembly of the flanging mold are provided with a central positioning column 53 and an inclined block 51 which can move radially around the central positioning column, i.e., a split die structure. A second inclined surface 511 is arranged on the side of the inclined block away from the positioning column. The length of the inclined block pressure column is greater than the length of the convex part of the pre-flanging mold and the flanging mold. As the convex part descends, the inclined surface of the pressure column abuts against the inclined surface of the inclined block, and the interaction causes the inclined block to move toward the positioning column, so that it can first abut against the outer wall of the blank.

[0065] The side of the inclined block facing the center positioning column from top to bottom is a bending guide surface 510, a contact arc surface 513 and a concave avoidance surface 512. The contact arc surface can fit tightly with the outer wall of the blank, and the bending guide surface cooperates with the punch part as a support surface for the bending edge to guide the blank to bend to a preset angle, and the concave avoidance surface avoids the outer flange formed on the lower side.

[0066] Based on the above structure, the workflow of pre-flanging and flanging is as follows:

[0067] Pre-flanging

[0068] Placing the blank: Carefully place the cage blank on the central positioning column 53 on the lower template of the pre-flanging unit. The precise positioning of the positioning column ensures that the blank will not shift during subsequent processing.

[0069] Die descent: The pre-flanging punch 50 and the pressure column begin to descend under the drive of the control system.

[0070] As the mold descends, multiple inclined blocks are pushed, and their contact arc surfaces fit tightly against the outer wall of the blank. The lower outer flange is located in the avoidance section. The purpose of this step is to preliminarily position the blank and prepare for the flanging operation.

[0071] Flanging starts: The leading section of the pre-flanging punch, whose diameter matches the inner diameter of the blank, gradually enters the inside of the blank and abuts against the inside of the blank. At the same time, the end of the blank is squeezed between the flanging section 500 of the pre-flanging punch and the bending guide surface 510 of the inclined block, and the end of the blank is squeezed and deformed to achieve preliminary flanging.

[0072] Mold reset: After the pre-flanging punch and the pressure column rise to their proper positions, the inclined block returns to its initial position under the action of the reset structure. At this point, the initial flanging is completed.

[0073] Forming flange

[0074] After the initial flanging is completed, the initial flanging blank is transferred to the flanging mold, and the flanging punch 54 and the pressure column are lowered in the same process as above - the inclined block is in place and the leading section enters the blank - flanging - rising and resetting to realize the forming flanging.

[0075] See also Fig.10 , the blank with the formed flange is transferred to the window punching die. The main components of the die include a horizontally arranged punching die 61, and the die is provided with punching holes corresponding to the desired window hole shape. The blank is carefully placed on the punching die. In order to prevent the blank from moving or deforming during the punching process, a locking cone 62 is needed to fix the outer flange part of one side of the blank. The locking cone can firmly clamp the outer flange and keep the blank stable through its special shape and structural design. When the blank is correctly fixed, the punch 60 begins to descend vertically from the top and enters the punching hole of the punching die. As the punch is further pressed down, the blank undergoes local plastic deformation under the joint action of the punch and the punching die, and finally forms the desired window hole shape. The mold is usually also equipped with an equal dividing wheel 63, which changes the relative position of the blank and the punching hole by rotating the locking cone (while driving the blank part fixed by it). Through multiple rotation and punching operations, multiple window holes can be evenly punched out around the blank.

[0076] When all the required windows are punched out, the punched blank can be removed from the mold for subsequent processing or processing. These subsequent processing may include deburring, cleaning, surface treatment and other steps to ensure the quality and appearance of the final product.

[0077] Anything not described in the present invention can be achieved by adopting or drawing on existing technologies.

[0078] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of various changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A production process for a double-end ring bent edge retainer, characterized in that: The following steps are involved: Step 1: Use high-precision punching equipment to accurately cut the raw materials to form a round blank disk that meets the design specifications, ensuring that the size accuracy and surface quality of the blank meet the requirements of subsequent processing; Step 2: Use a stretching and bottom cutting integrated forming die to stretch and bottom cut the circular blank disc, so that it is deformed into a semi-finished product with an inverted bowl-shaped structure, forming an inner turning edge of the upper end of the bowl toward the center of the circle and an outer turning edge of the lower end of the bowl away from the center of the circle; Step 3: Transfer the semi-finished product to the straightening and shaping mold, and correct the inner flange formed in the previous step to make it perpendicular to the horizontal reference plane; at the same time, adjust the outer flange to be parallel to the horizontal plane; Step 4: Use the trimming die to accurately adjust the length of the lower outer flange to meet the dimensional tolerance requirements in the design specifications and ensure the consistency and aesthetics of the outer flange; Step 5: With the help of a pre-flanging die, the upper end portion of the bowl-shaped structure is preliminarily bent to form a folded edge with a certain preset angle; Step 6: Use a flanging die to further bend the initially bent portion until it is completely parallel to the horizontal plane to form a stable upper outer flanging; Step 7: Finally, use the window punching die to perform precise window hole processing in the blank area between the upper and lower side flanges, and finally complete the entire processing process of the cage.

2. A production process for a double-end ring bent edge retainer according to claim 1, characterized in that: A smooth arc transition section is formed between the inner and outer flanges in step 2 and the bowl-shaped middle section.

3. A production process for a double-end ring bent edge retainer according to claim 2, characterized in that: After the straightening and shaping in step 3, the arc transition section is eliminated.

4. A production process for a double-end ring bent edge retainer according to claim 1, characterized in that: The length of the upper outer flange formed in step 6 is consistent with the length of the lower outer flange formed in step 4.

5. A production process for a double-end ring bent edge retainer according to claim 1, characterized in that: The angle between the folded edge formed in step 5 and the horizontal plane is 45°.

6. A production process for a double-end ring bent edge retainer according to claim 1, characterized in that: The pre-flanging mold in step 5 and the flanging mold in step 6, the end of the male mold part of the mold is a guide section that can extend into the interior of the blank, the upper part of the guide section is a flanging section with a flanging angle, the guide section first enters the interior of the blank and abuts the inner wall of the blank, the female mold part of the mold is composed of a plurality of movable split female molds, the split female molds include a supporting flanging section and an abutting section and an avoidance section thereunder, the supporting flanging section cooperates with the flanging section to provide support for the flanging of the blank during the flanging process, the split female mold moves radially during the flanging process to combine into a complete female mold structure, the abutting section fits the outer wall of the blank, and the lower outer flanging formed in step 2 is located in the avoidance section; as the male mold part continues to descend, the upper end portion of the blank is flanging along the preset flanging direction and angle.

7. A retainer die with double end ring bending edges, characterized in that: It includes a stretching and bottom cutting integrated forming die, a straightening and shaping die, a trimming die, a pre-flanging die, a flanging die and a window hole punching die; the stretching and bottom cutting integrated forming die can simultaneously realize the bowl-shaped forming and bowl bottom cutting operations of the blank, so that the upper end of the bowl-shaped blank forms an inner flanging edge, and the lower end of the bowl-shaped blank forms an outer flanging edge; the straightening and shaping die straightens and shapes the inner flanging edge and the outer flanging edge, so that the inner flanging edge is perpendicular to the horizontal plane, and the outer flanging edge is parallel to the horizontal plane; the trimming die trims the lower outer flanging edge to adjust the length; the pre-flanging die preliminarily bends the upper end of the bowl-shaped structure to form an angled flanging edge, and the flanging die bends the preliminarily bent flanging edge to a horizontal state; the window hole punching die punches the window hole on the middle section of the blank between the upper outer flanging edge and the lower outer flanging edge.

8. The double-end ring bent edge retainer mold according to claim 7, characterized in that: The stretching and bottom cutting integrated forming die is composed of four major components: a stretching die, a stretching punch, a pressure ring and a punching punch; a discharge channel is provided at the center of the stretching punch, and the pressure ring is arranged around it, with two pressing positions: initial and forming; initially, the pressure ring is flush with the top of the stretching punch to form a horizontal plane for placing the blank, and as the stretching die moves downward, the edge of the blank is clamped between the pressure ring and the stretching die, and the stretching punch supports the center of the blank to enter the forming cavity of the stretching die, gradually forming an inverted bowl-shaped structure; the punching punch at the center of the stretching die moves downward synchronously to penetrate the center of the forming blank to complete the punching and bottom cutting of the bowl bottom.

9. The double-end ring bent edge retainer mold according to claim 7, characterized in that: The pre-flanging mold and the upper mold assembly of the flanging mold are both provided with a pressure column, and a first inclined surface is set at the bottom of the pressure column. The pre-flanging mold and the lower mold assembly of the flanging mold are provided with a central positioning column and an inclined block that can move radially around the central positioning column. A second inclined surface is set on the side of the inclined block away from the positioning column. The length of the inclined block pressure column is greater than the length of the pre-flanging mold and the male mold part of the flanging mold. As the male mold part descends, the inclined surface of the pressure column abuts against the inclined surface of the inclined block, and the interaction causes the inclined block to move toward the positioning column, so that it can abut against the outer wall of the blank.

10. The double-end ring bending edge retainer mold according to claim 7, characterized in that: The side of the inclined block facing the center positioning column from top to bottom is a bending guide surface, a contact arc surface and a concave avoidance surface. The contact arc surface can fit tightly with the outer wall of the blank, and the bending guide surface cooperates with the punch part as a supporting surface for the bending edge to guide the blank to bend to a preset angle, and the concave avoidance surface avoids the outer flange formed on the lower side.

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