Die and equipment for window hole punching forming of pipe material clamping bearing retainer

Abstract

The invention discloses a die and equipment for window hole punching forming of a pipe material clamping bearing retainer. The die comprises a rigid outer ring and an elastic inner ring. A ring-width-adjustable clamping interval is formed between the rigid outer ring and the elastic inner ring, a first annular boss is arranged on the outer wall of the elastic inner ring, a limiting step is machined on the inner wall of the rigid outer ring, and the elastic inner ring has a first working state and a second working state. The ring width size of the clamping section is larger than the wall thickness of the tubular blank with the second annular boss on the inner wall, so that the tubular blank can be conveniently placed into the clamping section; in the second working state, the top face of the first annular boss and the side face of the limiting step abut against the inner surface and the outer surface of the tubular blank correspondingly, the bottom face of the second annular boss of the tubular blank is tightly attached to the bottom face of the first annular boss of the elastic inner ring, and meanwhile the end face of the tubular blank is tightly contacted with the step limiting end face of the rigid outer ring; axial double limiting on the tubular blank is formed, and clamping stability is guaranteed.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of bearing cage processing, and particularly relates to a die and equipment for forming window holes in a bearing cage of a pipe material. BACKGROUND

[0002] In the field of bearing manufacturing, bearing cages, as key components, play a crucial role in the overall stability, life, and reliability of bearings. The main function of bearing cages is to guide rolling elements to roll on the correct track and evenly separate the rolling elements to prevent mutual collision and friction, thereby ensuring the smooth and efficient operation of bearings under complex working conditions such as high speed and high load. Currently, the processing technology of bearing cages presents a diversified characteristic, among which the stamping processing method and the pipe cutting and hole opening processing method are the two common methods. However, both of these two traditional processing methods have a series of problems to be solved in practical application.

[0003] The stamping processing method plays an important role in the manufacturing of bearing cages. This process usually first punches the plate to form a blank similar to the shape of the cage, and then gradually forms the basic structure of the cage through a series of stamping processes. When processing a cage with a window, in order to facilitate subsequent processing operations, especially the window opening process, the cage is often not cut at the bottom, showing a "bowl" structure with one end not completely through, and a hole is reserved at the bottom of the "bowl". The main purpose of this design is to provide a clamping point during processing, and by clamping the bottom of the "bowl", the stable fixation of the cage is achieved, and then subsequent processing such as window opening is carried out.

[0004] However, the stamping processing method has many significant defects. From the perspective of stress and strain, during the stamping process, the material undergoes plastic deformation under the action of a large pressure, which produces complex stress distribution inside the cage. This uneven stress distribution not only may cause quality problems such as deformation and cracking of the cage during processing, but also may affect the precision and stability of the bearing and shorten the service life of the bearing during the long-term operation of the bearing, as the stress gradually releases and redistributes.

[0005] In the aspect of tear bands, stamping processing is prone to form tear bands around the edges and windows of the cage. These tear bands are a collection of micro-cracks caused by excessive local stress during stamping, which can significantly reduce the fatigue strength and impact resistance of the cage. Under high-speed and high-load working conditions, tear bands are prone to expand into macro-cracks, eventually leading to the fracture of the cage and causing bearing failure.

[0006] In addition, the stamping process has very high requirements for the precision and wear resistance of the die. With the increase of the number of processing times, the die will gradually wear, resulting in a decrease in the dimensional accuracy and shape accuracy of the retainer, thereby affecting the assembly quality and running performance of the bearing. Moreover, the manufacturing and replacement cost of the die is high, which increases the production cost of the bearing retainer.

[0007] The pipe cutting and hole machining mode is a relatively novel and potential processing technology. Firstly, the pipe material is cut into a certain length of ring pipe material, and then the hole is directly machined on the cut ring pipe material to form the basic structure of the retainer. Compared with the stamping processing mode, this processing mode has obvious advantages in stress and strain control and tear band formation. Since the deformation of the material during the pipe cutting and hole machining process is relatively small, and the processing process is more stable, the stress concentration inside the retainer can be reduced to a certain extent, the probability of tear band formation is reduced, and the quality and performance of the retainer are improved.

[0008] However, in actual production applications, the pipe cutting and hole machining mode also faces some technical problems that need to be solved. Since the pipe cutting is a complete ring pipe material, there is no bottom clamping point similar to the "bowl" structure of the stamping retainer. In the windowing process, how to stably clamp the ring pipe material becomes a big challenge. If the pipe ring is directly clamped, not only the operation space of the window punching will be occupied, affecting the processing efficiency, but also the surface of the pipe ring is smooth, which is easy to cause a slight displacement during the punching clamping process. Even a very small positional deviation will cause the punching position to be inaccurate, so that the window size and position accuracy of the retainer cannot meet the design requirements, resulting in product scrap and increasing production cost. Therefore, the existing technology needs to be further improved and improved. SUMMARY

[0009] The present application provides a die and equipment for pipe holding bearing retainer window punching forming, which can solve the problems of easy movement under stress, poor punching consistency, large high dispersion and uneven stress during pipe window punching.

[0010] To achieve the above object, the present application provides the following technical solutions: A die for pipe holding bearing retainer window punching forming, comprising: The clamping mold module comprises a rigid outer ring and an elastic inner ring; a clamping interval with adjustable ring width is formed between the rigid outer ring and the elastic inner ring; a first annular boss is arranged on the outer wall of the elastic inner ring, and a limiting step is arranged on the inner wall of the rigid outer ring; the elastic inner ring has a first working state and a second working state; when in the first working state, the ring width of the clamping interval is greater than the wall thickness of the tubular blank with the second annular boss on the inner wall, so that the tubular blank is easily put into the clamping interval; when in the second working state, the top surface of the first annular boss and the side surface of the limiting step abut against the inner surface and the outer surface of the tubular blank respectively, and the bottom surface of the second annular boss of the tubular blank is tightly attached to the bottom surface of the first annular boss of the elastic inner ring, while the end surface of the tubular blank is tightly attached to the step limiting end surface of the rigid outer ring, thereby forming double limiting in the axial direction of the tubular blank and ensuring the stability of clamping.

[0011] In the preferred implementation, the elastic inner ring comprises a ring seat and a plurality of deformation tables fixedly arranged on the ring seat and spaced apart, and a limiting table is arranged on the outer wall of the deformation table; the inner wall surfaces of the plurality of deformation tables jointly enclose a tapered space with a wide upper part and a narrow lower part, and the plurality of limiting tables jointly enclose a first annular boss; a tapered table is arranged at the central position of the elastic inner ring and can move along the axial direction of the elastic inner ring; the outer wall surface of the tapered table is in contact with the inner wall surface of the deformation table, and when the tapered table moves towards the narrow end of the tapered space formed by the deformation table, the elastic inner ring expands; when the tapered table moves towards the wide end of the tapered space formed by the deformation table, the elastic inner ring returns to the initial state under the action of its own elasticity.

[0012] In the preferred implementation, the clamping mold module is installed on the rotating disc of a hollow rotating platform, the rigid outer ring and the elastic inner ring are coaxially installed on the rotating disc of the hollow rotating platform, the tapered table is arranged on the upper side of the rotating disc and has a certain spacing with the rotating disc, a pull rod passes through the center of the rotating disc, one end of the pull rod is fixedly connected with the tapered table, and the other end of the pull rod is connected with a driving mechanism; the driving mechanism drives the pull rod to linearly move along the axial direction of the rotating disc, thereby driving the tapered table to move in the axial direction, and realizing the expansion or return of the elastic inner ring.

[0013] In the preferred implementation, an angle adjusting module is further included, which comprises a rotating seat and a fixed seat, the rotating seat can rotate relative to the fixed seat, and the hollow rotating platform is fixedly arranged on the rotating seat; the rotating seat is rotated to adjust the angle of the clamping mold module.

[0014] In the preferred implementation, a moving module is further included, which comprises a moving seat and a base plate; a sliding block is arranged on the bottom of the moving seat, and the base plate is provided with a sliding rail; the sliding block and the sliding rail are connected in cooperation; the fixed seat is arranged on the moving seat; the moving seat is connected with a displacement mechanism; and the displacement mechanism drives the moving seat to linearly move along the guide rail, so that the clamping mold module linearly moves horizontally.

[0015] An equipment for forming window holes of a pipe material holding bearing retainer, which is applied to a die for forming window holes of a pipe material holding bearing retainer, comprising a punching module, the punching module comprising a punching upper die assembly and a punching lower die assembly, the punching upper die assembly comprising a die handle, an upper die plate, a punching joint and a punching punch from top to bottom, the punching lower die assembly comprising a punching die, a punching die positioning plate, a punching die backing plate and a lower die seat from top to bottom, a guide column is arranged between the lower die seat and the upper die plate, the moving module drives the tubular blank to come between the punching punch and the punching die, and punches outward from the inside of the tubular blank.

[0016] In a preferred implementation, the surface of the punching die has an arc surface matching the tubular blank, and the punching die backing plate has a missing groove avoiding the rigid outer ring.

[0017] In a preferred implementation, the die handle has an avoiding part, the upper die plate, the punching joint, the punching punch and the lower part of the avoiding part of the die handle enter the pipe of the tubular blank, the die handle is connected with a reinforced support rod, the reinforced support rod is arranged obliquely, one end of the reinforced support rod is connected with the part of the die handle on the upper side of the avoiding part, the other end of the reinforced support rod is connected with the corresponding part of the die handle on the lower side of the avoiding part, the reinforced support rod provides additional support force for the die handle, and the stability of the whole die structure is enhanced.

[0018] In a preferred implementation, the avoiding part of the die handle is provided with a distance sensor facing the outer wall surface of the tubular blank, the distance sensor can measure the distance between the die handle and the outer wall surface of the tubular blank at each time of pressing in the pressing process in real time, the distance data measured by the distance sensor can detect the consistency of the force of the pressing upper die when the window holes of the retainer are punched; when the pressing upper die is uniformly stressed, the pressing distance is consistent within a reasonable error range; if the stress is uneven, the pressing parameters can be adjusted in time or the die state can be checked according to the difference data, so as to ensure the punching quality of the window holes of the retainer.

[0019] In a preferred implementation, the second annular boss is naturally formed by the part that is not turned during the turning inner diameter operation of the tubular blank.

[0020] The above structure has the following beneficial effects: 1. The die for forming window holes of a pipe material holding bearing retainer according to the present application, the top surface of the first annular boss and the side surface of the limiting step respectively abut the inner and outer surfaces of the tubular blank, so that the tubular blank is effectively fixed from the radial direction, preventing the radial displacement of the tubular blank during the punching of the window holes; the bottom surface of the second annular boss of the tubular blank closely abuts the bottom surface of the first annular boss of the elastic inner ring, and the end surface of the tubular blank closely contacts the limiting end surface of the step of the rigid outer ring, so that double limiting is realized from the axial direction, ensuring that the tubular blank will not produce axial movement during the punching of the window holes. This stable clamping provides a solid foundation for the punching of the window holes, ensuring the stability of the processing process.

[0021] 2. The application is used for pipe material holding bearing retainer punch window forming die. Since the tubular blank is firmly clamped during the punch window process, there is no punch position deviation problem caused by displacement. This can ensure that the punched window has high consistency on the pipe material one circle, effectively control the low high dispersion (i.e. the difference range of window position, size and other parameters), greatly improve the machining precision of bearing retainer, and then improve the product quality, reduce the scrap rate and rework rate caused by product quality problems, and reduce the production cost.

[0022] 3. The application is used for pipe material holding bearing retainer punch window forming die. By moving the cone, the expansion and contraction of the elastic inner ring can be controlled, the size of the clamping interval can be accurately adjusted, and the elastic inner ring and the tubular blank can be tightly fitted. This precise clamping method effectively avoids the shaking and displacement of the tubular blank during processing, greatly improves the stability and precision of clamping, and provides protection for high-quality punch window processing.

[0023] 4. The application is used for pipe material holding bearing retainer punch window forming equipment. By collecting the data measured by the distance sensor in real time, and comparing it with the pre-set standard pressing distance and reasonable error range. A data monitoring system can be set up, which can automatically record the distance data of each punch, and calculate the deviation value of the data in real time. When the deviation value exceeds the reasonable error range, the system will issue an alarm signal to prompt the operator that there may be an abnormality in the punching process. BRIEF DESCRIPTION OF DRAWINGS

[0024] The drawings described herein are used to provide further understanding of the application, and form a part of the application. The illustrative embodiments of the application and their descriptions are used to explain the application, and do not constitute an improper limitation on the application. In the drawings: Figure 1 A schematic embodiment of the application for pipe material clamping bearing retainer punch window forming die and equipment is shown in the figure; Figure 2 A schematic embodiment of the clamping die module of the application is shown in the figure; Figure 3 A schematic embodiment of the elastic inner ring of the application is shown in the figure; Figure 4 A schematic embodiment of the rigid outer ring of the application is shown in the figure; Figure 5 A schematic embodiment of the application for pipe material clamping bearing retainer punch window forming die is shown in the figure; Figure 6 A schematic embodiment of the application Figure 5An enlarged structural schematic view of one illustrative embodiment of the middle A portion; Label description: 1, clamping mold module; 10, rigid outer ring; 100, limiting step; 11, elastic inner ring; 110, first annular boss; 111, ring seat; 112, deformation table; 12, cone table; 13, pull rod; 2, intermediate rotating platform; 3, angle adjustment module; 30, rotating seat; 31, fixed seat; 4, moving module; 40, moving seat; 400, sliding block; 41, base plate; 410, sliding rail; 50, stamping upper die assembly; 500, die handle; 5000, avoiding part; 5001, enhanced support rod; 5002, distance sensor; 501, upper die plate; 502, punching joint; 503, punching punch; 51, stamping lower die assembly; 510, punching die; 5100, missing groove; 511, punching die positioning plate; 512, punching die backing plate; 513, lower die seat; 514, guide column; 6, tubular blank; 60, second annular boss. DETAILED DESCRIPTION

[0025] Hereinafter, only certain exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present application. Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.

[0026] The present application will be described below in conjunction with the accompanying drawings of the specification.

[0027] The specific solutions adopted are: As Figures 1-6 shown, the present application provides a mold and equipment for forming window holes of a pipe holding bearing retainer, comprising: The clamping mold module 1 comprises a rigid outer ring 10 and an elastic inner ring 11; a clamping interval with adjustable ring width is formed between the rigid outer ring and the elastic inner ring, the outer wall of the elastic inner ring is provided with a first annular boss 110, and the inner wall of the rigid outer ring is processed with a limiting step 100; the elastic inner ring 11 has a first working state and a second working state; when in the first working state, the ring width size of the clamping interval is greater than the wall thickness of the tubular blank 6 with the second annular boss 60 on the inner wall, so as to facilitate the tubular blank to be put into the clamping interval; when in the second working state, the top surface of the first annular boss and the side surface of the limiting step respectively abut the inner surface and the outer surface of the tubular blank, and the bottom surface of the second annular boss of the tubular blank tightly abuts the bottom surface of the first annular boss of the elastic inner ring while the end surface of the tubular blank tightly contacts the step limiting end surface of the rigid outer ring, forming double limiting in the axial direction of the tubular blank, and ensuring the stability of clamping.

[0028] By adopting the bearing retainer window hole forming die for pipe stock holding, the first working state of the elastic inner ring 11, at this time the clamping interval ring width size is greater than the wall thickness of the tubular blank 6, the tubular blank can be easily and smoothly put into the clamping interval, greatly simplifying the loading process and improving the production preparation efficiency. When the elastic inner ring is in the second working state, the close fit and abutment in multiple aspects form a strong and stable clamping force. The first annular boss top surface and the limiting step side surface abut the inner and outer surfaces of the tubular blank respectively, effectively fixing the tubular blank in the radial direction to prevent radial displacement during window hole forming; the close fit of the tubular blank second annular boss bottom surface and the elastic inner ring first annular boss bottom surface, and the close contact of the tubular blank end surface and the rigid outer ring step limiting end surface, realize double limiting from the axial direction, ensuring that the tubular blank will not produce axial movement during window hole forming. This stable clamping provides a solid foundation for the window hole forming process, ensuring the stability of the processing process.

[0029] The clamping interval ring width between the rigid outer ring and the elastic inner ring can be adjusted, which can be used for different specifications and wall thicknesses of tubular blanks. By adjusting the clamping interval ring width, the mold can meet the diversified production needs, without the need to customize a mold for each specification of tubular blank, reducing the mold manufacturing cost and production management cost, and improving the utilization efficiency of production resources.

[0030] Since the tubular blank 6 is stably clamped during window hole forming, there is no problem of punching position deviation caused by displacement. This can ensure that the punched window hole has high consistency on one circle of the pipe, effectively control the height difference (i.e. the difference range of window hole position, size and other parameters), greatly improve the machining precision of the bearing retainer, and thus improve the product quality, reduce the scrap rate and rework rate caused by product quality problems, and reduce the production cost.

[0031] The stable clamping makes the force on the tubular blank during window hole forming more uniform. During the punching process, the force transmission is more stable, avoiding the situation of local overlarge or over-small force caused by the shaking or displacement of the tubular blank. This helps to reduce the deformation, cracks and other defects of the pipe caused by uneven force, improves the strength and reliability of the pipe, and prolongs the service life of the bearing retainer.

[0032] The stable clamping state provides a guarantee for the control of the angle during window hole forming. During punching, the relative position of the mold and the tubular blank is fixed, which can ensure that the punching angle of each window hole strictly follows the design requirements, ensuring the angle precision between the window holes of the bearing retainer, so that the rolling elements can roll more smoothly between the window holes during the operation of the bearing, improving the running stability and performance of the bearing.

[0033] As a preferred embodiment of the present application, see Figure 2and Figure 3 The elastic inner ring 11 comprises a ring seat 111 and a plurality of deformation platforms 112 fixedly arranged on the ring seat and spaced apart, and the outer wall of the deformation platform is provided with a limiting platform; the inner wall surface of the plurality of deformation platforms collectively encloses a tapered space which is wide at the top and narrow at the bottom, and the plurality of limiting platforms enclose a first annular boss 110; the ring seat serves as a basic support structure and provides a platform for mounting and fixing other components, thereby ensuring the stability of the entire elastic inner ring structure. The plurality of deformation platforms are fixedly arranged on the ring seat and spaced apart, and this spaced arrangement provides space for the deformation of the deformation platforms under stress, which is a key structural basis for the elastic adjustment of the elastic inner ring. The outer wall of the deformation platform is provided with a limiting platform, and the inner wall surface of the plurality of deformation platforms collectively encloses a tapered space which is wide at the top and narrow at the bottom. When subjected to extrusion force from the tapered platform moving towards the narrow end, the deformation platform will expand outward; and when the extrusion force disappears, it can restore to its original state under the action of its own elasticity. The plurality of limiting platforms enclose a first annular boss. When clamping the tubular blank, it tightly cooperates with the relevant parts of the tubular blank to limit the tubular blank, preventing the tubular blank from shifting during processing such as window punching, thereby ensuring the accuracy and stability of processing. The tapered platform is arranged at the center of the elastic inner ring and can move along the axial direction of the elastic inner ring. Its outer wall surface is in contact with the inner wall surface of the deformation platform, and this contact allows the movement of the tapered platform to directly act on the deformation platform, causing the deformation of the deformation platform.

[0034] Specifically, when the tapered platform moves towards the narrow end of the tapered space formed by the deformation platforms, due to the shape characteristics of the tapered platform, it will gradually extrude the tapered inner wall surface of the deformation platform, forcing the deformation platform to expand outward. As the deformation platform expands, the overall diameter of the elastic inner ring increases, and the ring width of the clamping interval also decreases, which allows the elastic inner ring to tightly clamp the tubular blank. When the tapered platform moves towards the wide end of the tapered space formed by the deformation platforms, the extrusion force applied to the deformation platform gradually decreases. At this time, the deformation platform begins to recover to its initial state under the action of its own elasticity, and the elastic inner ring also shrinks, thereby increasing the ring width of the clamping interval, which facilitates the placement of the tubular blank.

[0035] The expansion and contraction of the elastic inner ring are controlled by the movement of the tapered platform 12, which can accurately adjust the size of the clamping interval, allowing the elastic inner ring to tightly fit with the tubular blank. This precise clamping method effectively prevents the tubular blank from shifting and moving during processing, greatly improving the stability and accuracy of clamping, thereby providing a guarantee for high-quality window punching processing.

[0036] In a preferred embodiment of this application, the clamping mold module is mounted on the turntable of the hollow rotating platform. The rigid outer ring 10 and the elastic inner ring 11 are coaxially mounted on the turntable of the hollow rotating platform 2. The truncated cone is located on the upper side of the turntable and has a certain distance between it and the turntable. The pull rod 13 passes through the center of the turntable, with one end fixedly connected to the truncated cone and the other end connected to the drive mechanism. The drive mechanism drives the pull rod to move linearly along the axial direction of the turntable, thereby causing the truncated cone to move in the axial direction, realizing the expansion or recovery action of the elastic inner ring. The specific actions are as follows: Initial preparation stage The rigid outer ring and elastic inner ring of the clamping mold module are coaxially mounted on the turntable of the hollow rotating platform, ensuring accurate and stable positioning. At this point, the elastic inner ring is in its initial state. Multiple deformation stages within it, under their own elasticity, enclose a relatively loose, tapered space that is wider at the top and narrower at the bottom, resulting in a relatively wide clamping area. The tapered truncated cone is positioned on the upper side of the turntable with a certain distance between it and the turntable. A pull rod passes through the center of the turntable, with one end connected to a bearing (such as a thrust bearing), fixing the inner ring and the outer ring. The other end is connected to the drive mechanism (such as a hydraulic drive device), which is in a standby state.

[0037] Inserting the tubular blank: Due to the relatively large clamping width of the elastic inner ring in its initial state, the operator can easily place the tubular blank to be processed into the clamping area formed by the rigid outer ring and the elastic inner ring. The inner wall of the tubular blank is opposite to the outer wall of the deformation platform of the elastic inner ring, and the outer wall is opposite to the inner wall of the rigid outer ring. At this time, the tubular blank is in a movable and loose state and has not yet been firmly clamped.

[0038] Clamping and fixing stage Drive Mechanism Activation: The drive mechanism is activated, and it begins to move, pulling the pull rod to move linearly along the axis of the turntable. Because the pull rod and the cone are connected by bearings, the cone is subjected to axial tension when the pull rod is pulled. As the pull rod is pulled, the cone moves towards the narrow end of the conical space formed by the deformation platform. The outer wall of the cone gradually presses against the inner wall of the deformation platform, forcing the deformation platform to expand outward. The limiting platform on the outer wall of the deformation platform moves outward accordingly, and the second annular boss formed by multiple limiting platforms also gradually expands, tightly abutting against the inner surface of the tubular blank. At the same time, the limiting step of the inner wall of the rigid outer ring abuts against the outer surface of the tubular blank, the bottom surface of the second annular boss of the tubular blank is tightly fitted with the bottom surface of the first annular boss of the elastic inner ring, and the end face of the tubular blank is in close contact with the limiting end face of the step of the rigid outer ring. This forms a double limiting effect on the tubular blank from both radial and axial directions, firmly clamping the tubular blank within the clamping area.

[0039] Rotary machining stage Hollow Rotary Platform Start-up: Once the tubular billet is securely clamped, the hollow rotary platform is started. The turntable of the hollow rotary platform begins to rotate. Since the rigid outer ring and the elastic inner ring are coaxially mounted on the turntable, they will rotate along with the turntable. At the same time, the frustum also rotates under the drive of the elastic inner ring and the rigid outer ring, while the tie rod is connected to the frustum through bearings and remains relatively stationary during rotation, not rotating with the turntable.

[0040] During the rotation of the turntable, the punching equipment punches windows in the tubular blank. As the tubular blank moves in a circular motion with the turntable, the punching equipment can sequentially create windows around the circumference of the tubular blank, achieving precise positioning of the windows around the circumference.

[0041] Restore initial and material handling phases Reverse motion of the drive mechanism: After the circumferential window opening is completed, the drive mechanism reverses its motion, pushing the pull rod to move linearly in the opposite direction along the turntable axis. The pull rod pushes the frustum toward the wide end of the conical space formed by the deformation platform, and the compressive force applied to the deformation platform gradually decreases.

[0042] Elastic inner ring recovery: Under its own elastic force, the deformation stage begins to recover to its initial state, and the outwardly expanding limiting stage also contracts accordingly. The contact force between the second annular boss and the inner surface of the tubular blank decreases, the width of the clamping zone increases, and the clamping force on the tubular blank disappears. At this time, the operator can easily remove the processed tubular blank from the clamping zone, completing one complete processing cycle. Afterward, the system can repeat the above actions to process new tubular blanks.

[0043] As a preferred embodiment of this application, it also includes an angle adjustment module 3, which includes a rotating seat 30 and a fixed seat 31. The rotating seat can rotate relative to the fixed seat. Specifically, the rotating seat is connected to a rotating shaft, the fixed seat is provided with a bearing seat, the rotating shaft is connected to the bearing seat, and the rotating shaft is connected to a power component to realize rotation. The hollow rotating platform is fixedly set on the rotating seat, and the rotating seat rotates to adjust the angle of the clamping mold module.

[0044] When no angle adjustment is performed, the rotary seat is in a default position, while the fixed seat remains stationary. The hollow rotary platform and the clamping mold module mounted on it, including the rigid outer ring and the elastic inner ring, are also in a relatively fixed angular position. When the angle of the clamping mold module needs to be adjusted according to processing requirements, the power component connected to the rotating shaft is activated. This power component can be a device such as a motor that can provide rotational power. The power component starts operating and outputs torque. Because the hollow rotary platform is fixedly mounted on the rotary seat, it rotates along with the rotary seat. The clamping mold module is mounted on the turntable of the hollow rotary platform, causing the entire clamping mold module, including the rigid outer ring, the elastic inner ring, and the clamped tube, to change angles as the rotary seat rotates. For example, if it is necessary to adjust the opening angle of the window hole on the tube, the angle of the clamping mold module relative to the processing equipment (such as a punching machine) can be precisely changed by controlling the rotation angle of the rotary seat, thereby achieving different angle openings. When the rotary seat rotates to the required angle position, the operation of the power component stops.

[0045] In actual tube processing, different products may have different requirements for the opening angle of the window. The angle adjustment module allows the clamping mold module to flexibly adjust the angle of the tube, thereby meeting the processing needs of various window angles. For example, in the processing of some specially shaped bearing cages, it may be necessary to open window holes at a certain angle, which can be easily achieved through the angle adjustment module.

[0046] Although this module was originally designed primarily for ordinary pipe materials, it can also clamp tapered pipe materials by adaptively changing the shape of the rigid outer ring and the elastic inner ring. Furthermore, the presence of the angle adjustment module allows for convenient adjustment of the processing angle when clamping pipe materials of different shapes, enhancing the equipment's versatility for various pipe shapes and expanding its application range.

[0047] Further, see Figure 1 It also includes a moving module, which includes a moving base 40 and a base plate 41. The bottom of the moving base is provided with a slider 400, and the base plate is provided with a slide rail 410. The slider and the slide rail are connected in cooperation. The fixed base is provided on the moving base. The moving base is connected to a displacement mechanism. The displacement mechanism drives the moving base to move linearly along the guide rail so that the clamping mold module moves horizontally and linearly to cooperate with the punching module.

[0048] See Figure 1 and Figure 5The punching module includes an upper punching die assembly 50 and a lower punching die assembly 51. The upper punching die assembly, from top to bottom, includes a die handle 500, an upper template 501, a punching connector 502, and a punching punch 503. The lower punching die assembly, from top to bottom, includes a punching die 510, a punching die positioning plate 511, a punching die pad 512, and a lower die base. A guide post 514 is provided between the lower die base 513 and the upper template. In its initial state, the moving module is positioned away from the punching punch and punching die. At this time, the tubular blank is clamped in the clamping die module and is in a state awaiting processing. Upon receiving a processing command, the moving module begins to move. It is powered by a drive device (such as a servo motor or hydraulic cylinder) and moves the clamping die module holding the tubular blank smoothly and precisely between the punching punch and punching die according to a pre-set path and speed, punching from the inside of the tubular blank outwards. The material on the inner wall of the tubular blank begins to undergo plastic deformation and gradually separates from the surrounding material, forming a hole. Since the punching process is from the inside out, the tear strip generated during punching will be located on the outer surface of the tubular blank. After punching, a beveling tool (such as a beveling die or beveling roller) is moved to the vicinity of the punching location on the tubular blank and adjusted to a suitable position and angle to beveling the tear strip at the outer edge of the punch. The beveling tool applies pressure from the outside of the tubular blank to the outside of the punch, causing the material in the tear strip to undergo plastic deformation and flow into the hole, thereby eliminating the tear strip, making the punched edge smoother and flatter, and improving the processing quality of the tubular blank.

[0049] Furthermore, the surface of the punching die has an arc-shaped surface adapted to the tubular blank, and the punching die backing plate has a notch 5100 to avoid the rigid outer ring. The tubular blank has a specific cylindrical shape, and the surface of the punching die is designed to adapt to the arc-shaped surface of the tubular blank so that the die and the outer surface of the tubular blank can fit tightly together during the punching process. This fit can provide uniform support force, ensuring that the tubular blank will not deform or shift due to uneven local force when the punch impacts the inner wall of the tubular blank for punching, thereby ensuring the accuracy and quality of punching.

[0050] During processing, the tubular blank is held by a clamping die module consisting of a rigid outer ring and an elastic inner ring. The rigid outer ring, as a crucial component of the clamping die module, has a relatively fixed position. When the moving module drives the tubular blank towards the punching position, if the punching die pad does not have a notch, the rigid outer ring will collide and interfere with the pad, hindering the smooth movement of the tubular blank and potentially damaging the tubular blank or the clamping die module. The notch provides clearance for the rigid outer ring, ensuring that the tubular blank can accurately and smoothly reach the punching position under the drive of the moving module.

[0051] Furthermore, in a preferred embodiment of this application, the mold handle 500 has a clearance portion 5000. The upper template, punching joint, punching punch, and lower part of the mold handle clearance portion enter the tubular blank tube. The mold handle is connected to a reinforcing support rod 5001, which is inclined and has one end connected to the mold handle portion above the clearance portion and the other end connected to the corresponding mold handle portion below the clearance portion, providing additional support force for the mold handle and enhancing the stability of the entire mold structure.

[0052] In the die structure connecting to stamping equipment, the die handle has a clearance section for specific processing requirements. When punching tubular blanks, the upper die plate, punching joint, and punch need to enter the tubular blank to complete the punching action. If the die handle does not have a clearance section, translation will cause interference. Therefore, the clearance section is set to provide sufficient space for the punch and other components to enter the tubular blank, ensuring smooth punching. Because the die handle has a clearance section, a portion of the die handle is suspended in the air at the clearance section. When the stamping equipment applies pressure for punching, the suspended portion of the die handle will bear significant pressure and stress concentration. Under this stress state for a long time, the suspended portion of the die handle is prone to deformation, breakage, and other damage, affecting the service life and processing accuracy of the die.

[0053] If the die handle lacks sufficient strength due to the design of the clearance section, it may wobble or deform during punching, causing the punch to shift position and affecting the punching accuracy and hole quality. Furthermore, an unstable die structure can lead to safety accidents, harming operators and equipment. Therefore, reinforcing support rods are needed to improve the strength and stability of the die handle. The reinforcing support rod is angled, with one end connected to the upper part of the die handle above the clearance section and the other end connected to the corresponding lower part of the die handle below the clearance section. This connection method allows the support rod to form an angled support structure in the suspended portion of the die handle, providing additional support force. When the stamping equipment applies pressure, the support rod can share some of the pressure on the suspended portion of the die handle, reducing the stress on the die handle and lowering the risk of deformation and damage.

[0054] This mold structure balances the needs for both clearance and strength. The clearance design ensures that components such as the punch can smoothly enter the tubular blank for punching, while the reinforced support rod improves the strength and stability of the mold handle without affecting the clearance function. This balanced design allows the mold to adapt to the punching requirements of tubular blanks, while ensuring the mold's service life and processing quality.

[0055] In a preferred embodiment of this application, a distance sensor is provided on the die handle clearance portion facing the outer wall of the tubular blank. During the stamping process of the circumferential window holes in the retainer, to ensure uniform stamping force for each window hole and guarantee the stamping quality, a distance sensor is provided on the die handle clearance portion facing the outer wall of the tubular blank. This sensor can measure the distance between the die handle and the outer wall of the tubular blank in real time during each downward press of the die handle. By analyzing the distance data, the consistency of the force on the upper die during stamping can be detected, thereby identifying potential problems in advance and making timely adjustments.

[0056] The distance sensor 5002 can measure the distance between the die handle and the outer wall of the tubular blank in real time with high accuracy. During the stamping process, this distance is not constant but changes with factors such as the stamping force, die wear, and dimensional deviations of the tubular blank. By continuously monitoring this distance, key data reflecting the state of the stamping process can be obtained.

[0057] When the upper die of a stamping press is subjected to uniform force, it means that the stamping force is applied evenly to the tubular blank during each stamping process, resulting in consistent deformation of the tubular blank in all directions. In this case, the downward pressing distance of the die handle will remain consistent within a reasonable error range. This is because uniform force stabilizes the movement of the die, and the interaction force between the die handle and the tubular blank is also relatively stable, leading to minimal variation in the pressing distance. For example, ideally, if the standard pressing distance of the die handle is set to 10mm, with a reasonable error range of ±0.1mm, then during multiple consecutive stamping processes, the pressing distance measured by the distance sensor should fluctuate between 9.9mm and 10.1mm.

[0058] Uneven force on the upper die during stamping indicates that certain factors during the stamping process cause variations in stamping force at different locations or times. This difference leads to uneven deformation of the tubular blank, thus affecting the die's downward pressing distance. For example, wear on a part of the die reduces the stamping force transmitted to that part, increasing the pressing distance at that location; while the pressing distance in other normal areas remains relatively small. This difference in pressing distance can be clearly observed through data measured by a distance sensor. If a measured pressing distance of 10.5mm significantly exceeds the reasonable error range, it indicates that the upper die may be experiencing uneven force.

[0059] By acquiring data from a distance sensor in real time and comparing it with a pre-set standard pressing distance and a reasonable error range, a data monitoring system can be set up. This system can automatically record the distance data for each pressing operation and calculate the deviation value in real time. When the deviation value exceeds the reasonable error range, the system will issue an alarm signal to alert the operator that there may be an abnormality in the pressing process.

[0060] Once uneven force is detected on the upper die during stamping, the first step is to adjust the stamping parameters. For example, if the downward pressure distance is too large, it may be due to excessive stamping force, in which case the stamping force can be appropriately reduced; if the downward pressure distance is too small, the stamping force can be increased. In addition, parameters such as stamping speed and holding time can be adjusted to improve the stress state during the stamping process. Besides adjusting the stamping parameters, a comprehensive inspection of the die condition is also necessary. Check all parts of the die for wear, looseness, damage, etc., especially components related to the transmission of stamping force and die movement, such as punches, guide pillars, and guide bushings. If any problems are found with the die components, they should be repaired or replaced promptly to ensure the normal operation of the die.

[0061] This solution can monitor the distance between the die handle and the outer wall of the tubular blank in real time during the stamping process, and detect uneven stress on the upper die in advance by analyzing the distance data. Compared with traditional methods that rely on manual inspection or post-inspection, this real-time monitoring method can detect problems as soon as they occur, preventing them from escalating and reducing the generation of scrap.

[0062] By adjusting stamping parameters in a timely manner and inspecting and maintaining the condition of the molds, it is possible to ensure that the stamping force of each window is uniform and consistent, thereby improving the stamping quality of the cage windows. High-quality windows ensure the assembly accuracy and operational stability of the cage, improving the overall performance and reliability of the product.

[0063] Real-time monitoring and proactive problem-solving can reduce production downtime caused by mold failures or substandard stamping quality, thereby improving production efficiency. Simultaneously, a stable stamping process helps extend mold lifespan, reduces mold replacement frequency, and further lowers production costs.

[0064] In a preferred embodiment of this application, the second annular boss is naturally formed from the portion of the tubular blank that was not machined during the inner diameter turning operation. In the cage manufacturing process, the tubular blank is an important starting material. Since the initial thickness of the tubular blank is usually inconsistent with the thickness required for the final cage, inner diameter turning is an essential machining step to achieve the designed dimensional specifications. During inner diameter turning, the cutting tool cuts the inner wall of the tubular blank along a predetermined path and depth, removing excess material. The second annular boss is naturally formed during this turning process; it is the portion of the tubular blank that was not machined. This unmachined area retains some of the initial thickness and shape of the tubular blank, thus forming an annular protrusion structure with a certain height and width, namely the second annular boss. The second annular boss and the main body of the tubular blank form a continuous and complete whole, without any connection through secondary processing methods such as welding or splicing, thus forming a reliable clamping fit structure during clamping.

[0065] For any parts not mentioned in this invention, existing technologies can be used or referenced.

[0066] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in the present invention, and these should all be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A mold for forming punched holes in bearing cages of tubular material, characterized in that, The utility model relates to a clamping die module, comprising a rigid outer ring and an elastic inner ring, a clamping interval with adjustable ring width is formed between the rigid outer ring and the elastic inner ring, a first annular boss is arranged on the outer wall of the elastic inner ring, and a limiting step is arranged on the inner wall of the rigid outer ring, the elastic inner ring has a first working state and a second working state, when in the first working state, the ring width of the clamping interval is larger than the wall thickness of the tubular blank with the second annular boss on the inner wall, so that the tubular blank is easily put into the clamping interval, when in the second working state, the top surface of the first annular boss and the side surface of the limiting step abut the inner surface and the outer surface of the tubular blank respectively, the bottom surface of the second annular boss of the tubular blank is tightly attached to the bottom surface of the first annular boss of the elastic inner ring, the end surface of the tubular blank is tightly attached to the step limiting end surface of the rigid outer ring, the tubular blank is axially doubly limited, and the stability of clamping is ensured. The elastic inner ring comprises a ring seat and a plurality of deformation tables fixedly arranged on the ring seat and spaced apart, a limiting table is arranged on the outer wall of the deformation table, the inner wall surfaces of the plurality of deformation tables jointly enclose a tapered space which is wide at the top and narrow at the bottom, the limiting tables jointly enclose a first annular boss, a tapered table is arranged at the central position of the elastic inner ring and can move along the axial direction of the elastic inner ring, the outer wall surface of the tapered table is in contact with the inner wall surface of the deformation table, when the tapered table moves towards the narrow end of the tapered space formed by the deformation tables, the elastic inner ring expands, and when the tapered table moves towards the wide end of the tapered space formed by the deformation tables, the elastic inner ring restores to the initial state under the elastic action of itself.

2. The die for forming a bearing retainer cage window hole for a tube stock as claimed in claim 1, wherein, The clamping die module is installed on the rotating disc of a hollow rotating platform, the rigid outer ring and the elastic inner ring are coaxially installed on the rotating disc of the hollow rotating platform, the tapered table is arranged on the upper side of the rotating disc and has a certain spacing with the rotating disc, a pull rod passes through the center of the rotating disc, one end of the pull rod is fixedly connected with the tapered table, and the other end of the pull rod is connected with a driving mechanism, the driving mechanism drives the pull rod to linearly move along the axial direction of the rotating disc, thereby driving the tapered table to move in the axial direction, and the expansion or restoration action of the elastic inner ring is realized.

3. The die set for forming a bearing retainer cage window in a tube stock according to claim 2, wherein, The utility model further comprises an angle adjusting module, the angle adjusting module comprises a rotating seat and a fixed seat, the rotating seat can rotate relative to the fixed seat, the hollow rotating platform is fixedly arranged on the rotating seat, and the rotating seat is rotated to adjust the angle of the clamping die module.

4. The die set for forming a bearing retainer cage window in a tube stock according to claim 1, wherein, The utility model further comprises a moving module, the moving module comprises a moving seat and a base plate, a sliding block is arranged on the bottom of the moving seat, the base plate is provided with a sliding rail, the sliding block and the sliding rail are connected in a matched mode, the fixed seat is arranged on the moving seat, the moving seat is connected with a displacement mechanism, the displacement mechanism drives the moving seat to linearly move along the guide rail, so that the clamping die module linearly moves horizontally.

5. The die and apparatus for forming a bearing retainer punch window in a tube stock, according to claim 4, wherein, The utility model further comprises a punching module, the punching module comprises a punching upper die assembly and a punching lower die assembly, the punching upper die assembly comprises a die handle, an upper die plate, a punching connector and a punching punch head from top to bottom, the punching lower die assembly comprises a punching concave die, a punching concave die positioning plate, a punching concave die backing plate and a lower die seat from top to bottom, a guide column is arranged between the lower die seat and the upper die plate, the moving module drives the tubular blank to be between the punching punch head and the punching concave die, and the tubular blank is punched from the inside to the outside.

6. An apparatus for forming a window hole of a tube stock supporting bearing cage, using the die for forming a window hole of a tube stock supporting bearing cage according to claim 5, wherein ​ 7. The apparatus for forming window holes of a tube stock holding bearing retainer according to claim 6, wherein The surface of the piercing die has an arc surface matching the arc surface of the tubular blank, and the die pad has a notch avoiding the rigid outer ring.

8. The apparatus for forming window holes of a tube stock holding bearing retainer according to claim 6, wherein The die holder has an avoiding part, the upper die plate, the piercing joint, the piercing punch and the lower part of the avoiding part enter the tubular blank pipe, the die holder is connected with the reinforced support rod, the reinforced support rod is obliquely arranged, one end of the reinforced support rod is connected with the die holder part on the upper side of the avoiding part, the other end of the reinforced support rod is connected with the corresponding die holder part on the lower side of the avoiding part, the die holder is provided with additional support force, and the stability of the whole die structure is enhanced.

9. The apparatus for forming window holes in a tube stock retaining bearing cage of claim 1 wherein, The avoiding part of the die holder is provided with a distance sensor facing the outer wall surface of the tubular blank, the distance sensor can measure the distance between the die holder and the outer wall surface of the tubular blank in real time when the die holder is pressed down each time in the stamping process, the distance data measured by the distance sensor can detect the consistency of the force of the upper die in the process of punching the circumferential window hole of the retainer, when the force of the upper die is uniform, the pressing distance is consistent within a reasonable error range, if the force is uneven, the stamping parameters can be adjusted in time or the die state can be checked according to the difference data, so as to ensure the stamping quality of the window hole of the retainer.

10. The apparatus for forming window holes in a tube stock retaining bearing cage of claim 1 wherein, The second annular boss is naturally formed by the part not being turned when the inner diameter of the tubular blank is turned.

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