Cylinder roller surface strengthening apparatus

Abstract

A cylindrical roller surface strengthening device, including fixed frame and drive motor, the fixed frame is provided with fixed cylinder, the inside of fixed cylinder is provided with roller strengthening assembly, the output of drive motor is connected with roller strengthening assembly to drive roller strengthening assembly rotation, the roller strengthening assembly includes pivot, the pivot is connected with rotating drum and is fixed with the clamping sleeve of rotating drum, the clamping sleeve is provided with several clamping grooves that cooperate with cylindrical roller along its circumference, the clamping sleeve is provided with the strengthening groove for loading impact ball, the inner diameter surface of clamping sleeve is provided with several impact plates along the circumference.The beneficial effects of the utility model are that: drive motor drives roller strengthening assembly to rotate, makes impact ball repeatedly impact cylindrical roller clamped in clamping groove with the poking of impact plate in strengthening groove.

Description

Technical Field

[0001] This utility model relates to a surface strengthening device, and more particularly to a cylindrical roller surface strengthening device. Background Technology

[0002] In the field of mechanical parts manufacturing, cylindrical rollers, as core components of transmission systems such as rolling bearings, directly determine the reliability of the entire machine through their surface quality and fatigue life. To improve the surface hardness of cylindrical rollers, introduce residual compressive stress, and enhance wear resistance, surface strengthening treatment is commonly used in industry. A typical application is in the semi-finished stage before finishing the rollers, where the outer surface and ends of the rollers are cold-worked using physical means. Existing strengthening processes mostly employ contact processes such as shot peening, rolling, or grinding impact. Rolling strengthening utilizes high-hardness rollers to apply controllable pressure to the surface to be treated and roll relative to it, gradually accumulating a hardened layer. This type of process typically requires specialized equipment with multi-degree-of-freedom tooling to perform batch-by-batch, long-cycle surface treatment of the rollers in mass production.

[0003] However, the aforementioned existing technologies have revealed significant shortcomings in practical applications. Roller hardening is limited by the tool contact area, making it difficult to form a complete hardening band in the roller end region with chamfered or rounded transitions. Furthermore, the continuous concentration of force easily leads to micro-deformation of the roller or discontinuous distribution of residual stress, weakening fatigue resistance. These defects limit further improvements in the quality of hardening. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides a cylindrical roller surface strengthening device that can uniformly strengthen cylindrical rollers and their end transition areas.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a cylindrical roller surface strengthening device, comprising a fixed frame and a drive motor, wherein a fixed cylinder is provided on the fixed frame, and a roller strengthening assembly is provided inside the fixed cylinder, the output end of the drive motor is connected to the roller strengthening assembly to drive the roller strengthening assembly to rotate, the roller strengthening assembly comprising a rotating shaft, a rotating cylinder connected to the rotating shaft, and a snap-fit ​​cylinder fixed to the rotating cylinder, the snap-fit ​​cylinder having a plurality of snap-fit ​​grooves along its circumference that mate with the cylindrical rollers, the snap-fit ​​cylinder having a strengthening groove for inserting impact balls, and a plurality of impact plates being provided circumferentially on the inner diameter surface of the snap-fit ​​cylinder.

[0006] The beneficial effects of this invention are as follows: The drive motor rotates the roller strengthening assembly, causing the impact balls to repeatedly impact the cylindrical rollers locked in the locking grooves within the strengthening grooves, driven by the movement of the impact plate. This impact effect uniformly covers the outer circumference of the cylindrical rollers, as well as the chamfered and rounded transition areas at the ends, forming a continuous and dense surface strengthening layer. This avoids the problems of incomplete strengthening bands and discontinuous residual stress caused by limited contact areas in traditional rolling processes, thus significantly improving the fatigue resistance and service life of the cylindrical rollers. The equipment utilizes the random impact effect generated by multiple impact balls during rotation, resulting in a dispersed load distribution that is less likely to cause microstructural distortion in the rollers, leading to more stable strengthening quality. As a preferred method, the locking cylinder can be detachably fixed to the rotating drum via an end flange, facilitating the replacement of locking cylinders with different locking groove sizes according to the roller specifications. A spline connection is used between the rotating shaft and the rotating drum to transmit torque, ensuring synchronous rotation and convenient assembly / disassembly. As another preferred method, at least one annular baffle can be installed in the reinforcing groove along the axial direction. The baffle divides the reinforcing groove into multiple relatively independent sub-cavities, allowing the impact balls to move in separate zones, improving the uniformity of the impact balls' distribution along the axial direction, and promoting a consistent reinforcing effect for the cylindrical rollers throughout their entire length.

[0007] Furthermore, the width of the locking groove is smaller than the radius of the cylindrical roller. This width limitation reliably constrains the cylindrical roller radially, allowing only a portion of its surface facing the reinforcing groove to be exposed. This prevents the cylindrical roller from sliding entirely into the reinforcing groove and jamming or damaging the equipment, while ensuring sufficient exposed arc surface is directly impacted by the impact ball. This effectively transfers impact energy to the roller surface, providing targeted reinforcement to its working contact area and edges prone to fatigue crack initiation. As a preferred embodiment, the two side walls of the locking groove can be designed with inwardly extending arc-shaped limiting lips. The extended ends of the limiting lips form line contact with the cylindrical roller, providing stable radial support during rotation while preventing excessive heat generation from large-area friction. As another preferred embodiment, the bottom support surface of the locking groove can be formed as a concave arc surface that matches the outer circumference of the cylindrical roller. The radius of curvature of the arc surface is equal to the radius of the roller, making the roller more stable in circumferential positioning and preventing deflection when impacted by the impact ball.

[0008] Furthermore, several impact plates are equidistantly arranged circumferentially on the inner diameter surface of the snap-fit ​​cylinder. The radial distance between the impact plates and the rotating shaft is greater than the diameter of the impact ball. The equidistant arrangement of the impact plates causes the impact ball to be regularly agitated and scattered in the circumferential direction, ensuring that the cylindrical rollers in each snap-fit ​​groove receive multiple high-frequency impacts within the operating cycle, resulting in high strengthening efficiency and good consistency. The radial space reserved between the impact plates and the rotating shaft is greater than the diameter of the impact ball, giving the impact ball sufficient freedom of movement. It can be lifted to a certain height between adjacent impact plates as the cylinder rotates and then fall or be launched freely, achieving a powerful impact on the cylindrical rollers. As a preferred embodiment, a wear-resistant alloy liner is fixed to the side of the impact plate facing the strengthening groove. The surface of the liner has multiple arc-shaped guide lines, which can guide the impact ball to accelerate its sliding along a preset trajectory. As another preferred embodiment, the free end of the impact plate can be processed into an inwardly bent hook-shaped structure. When the hook-shaped structure rotates to a high position, it can lift part of the impact ball an additional distance before releasing it, increasing the impact energy.

[0009] Furthermore, the snap-fit ​​grooves are equidistantly arranged along the circumference of the snap-fit ​​cylinder, and there are multiple such grooves. On one side end face of the rotating cylinder along the axial direction, corresponding to the snap-fit ​​groove positions, there are inlets and outlets for the cylindrical rollers to enter and exit. The inlets and outlets on the end face of the rotating cylinder, corresponding to the snap-fit ​​grooves, simplify and streamline the loading and unloading operations of the cylindrical rollers, eliminating the need to disassemble the cylinder and significantly reducing auxiliary operation time, thus adapting to batch processing requirements. Multiple snap-fit ​​grooves are equidistantly distributed along the circumference of the snap-fit ​​cylinder, allowing multiple cylindrical rollers to be clamped and reinforced simultaneously. This ensures stable equipment operation and multiplies production efficiency. As a preferred embodiment, a rotatable arc-shaped cover can be installed at the inlet and outlet. One end of the cover is connected to the end face of the rotating cylinder via a hinge, and the other end has an elastic buckle. After a cylindrical roller is placed in, the cover closes and is automatically locked by the buckle, preventing the cylindrical roller from coming out under centrifugal force or impact. As another preferred method, a recessed elastic pressure block can be provided on the inner side of the inlet and outlet. When the cylindrical roller is installed and closed by the end cover, the elastic pressure block abuts against the end face of the roller, eliminating the clamping gap and absorbing part of the axial vibration.

[0010] Furthermore, the drive motor and the rotating drum are connected by a transmission belt, which is directly fitted onto the outer diameter surface of the rotating drum. This transmission method, where the transmission belt is directly fitted onto the outer diameter surface of the rotating drum, reduces intermediate transmission links, resulting in a compact structure and smooth transmission. The belt, under its own elasticity and tension, can tightly adhere to the drum surface, preventing it from jumping or falling off during operation. This method also provides some protection against overload by preventing damage to the drive motor or roller reinforcement components due to abnormal resistance through belt slippage. As a preferred option, multiple annular belt grooves can be formed on the outer diameter surface of the rotating drum. The cross-sectional shape of the belt grooves matches the inner contour of the transmission belt, allowing the belt to embed into the grooves and form multi-groove meshing, increasing the contact area and preventing axial displacement of the belt. As another preferred option, a multi-wedge belt can be selected as the transmission belt, with a corresponding multi-wedge grooved pulley structure on the outer diameter surface of the rotating drum. The frictional self-locking effect generated by the wedge surface further improves transmission reliability, ensuring the belt maintains tension even after long-term operation and is not prone to loosening. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model; Figure 2 This is a cross-sectional view of the roller reinforcement component in an embodiment of the present invention; Figure 3 This is a disassembled diagram of the roller reinforcement component according to an embodiment of the present invention. Detailed Implementation

[0012] This utility model embodiment provides a cylindrical roller surface strengthening device, such as... Figure 1-3 As shown, the assembly includes a fixed frame 1 serving as a supporting base and a drive motor 2 providing power. A fixed cylinder 3 is fixedly mounted on the fixed frame 1. Inside the fixed cylinder 3, a roller strengthening assembly for surface treatment of the cylindrical rollers 7 is installed. The output end of the drive motor 2 is connected to the roller strengthening assembly to drive the entire roller strengthening assembly to rotate. Power is transmitted between the drive motor 2 and the roller strengthening assembly via a transmission belt 9. The transmission belt 9 is directly fitted onto the outer diameter surface of the rotating drum 5 in the roller strengthening assembly. Both ends of the outer diameter surface of the rotating drum 5 are machined with annular retaining edges to prevent the transmission belt 9 from easily falling off the rotating drum 5 during operation.

[0013] The roller reinforcement assembly includes a centrally located rotating shaft 4, a rotating cylinder 5 sleeved and fixed to the outside of the rotating shaft 4, and a clamping cylinder 6 coaxially fixed to the rotating cylinder 5. The rotating shaft 4 is rotatably supported on the fixed frame 1 by bearings. The clamping cylinder 6 is cylindrical in shape, and its hollow interior area forms a reinforcement groove 62, in which several impact balls 8 are freely placed. Multiple impact plates 63 are fixed at equal intervals along the circumferential direction on the inner diameter surface of the clamping cylinder 6. The impact plates 63 extend radially inward, and the radial distance between the innermost end of the impact plate 63 and the axis of the rotating shaft 4 is greater than the diameter of the impact balls 8, so as to ensure that the impact balls 8 can move smoothly in the space between adjacent impact plates 63. Multiple clamping grooves 61 are equally spaced along the circumferential direction on the cylinder wall of the clamping cylinder 6. The clamping grooves 61 penetrate the wall thickness of the clamping cylinder 6 axially and communicate with the reinforcement grooves 62. Each clamping groove 61 is used to clamp a cylindrical roller 7. The width of the snap-fit ​​groove 61 is smaller than the radius of the cylindrical roller 7, preventing the cylindrical roller 7 from falling into the reinforcing groove 62, while allowing a portion of the circumferential surface of the cylindrical roller 7 to be exposed in the reinforcing groove 62 and within the impact range of the impact ball 8. On the side end face of the rotating drum 5 away from the drive motor 2 along the axial direction, there are inlets and outlets 51 at positions corresponding to each snap-fit ​​groove 61 for the cylindrical roller 7 to enter and exit. After the cylindrical roller 7 is installed, the inlets and outlets 51 are sealed with removable covers to prevent the cylindrical roller 7 from coming out during rotation.

[0014] The working principle of this embodiment is as follows: First, the impact ball 8 is placed into the strengthening groove 62 of the retaining cylinder 6, and the cylindrical rollers 7 to be strengthened are placed one by one into the retaining grooves 61 through the inlet and outlet 51, and then the inlet and outlet 51 is closed. The drive motor 2 is started, and the drive motor 2 drives the rotating drum 5, retaining cylinder 6 and rotating shaft 4 to rotate together through the transmission belt 9. During the rotation, the impact ball 8 inside the retaining cylinder 6 moves violently under the action of centrifugal force, gravity and inertia, repeatedly impacting the impact plate 63 and the surface of the cylindrical rollers 7 exposed in the strengthening groove 62 from the retaining groove 61. At the same time, the cylindrical rollers 7 also rotate under the action of centrifugal force, gravity and inertia. The impact energy of the impact ball 8 is transferred to the cylindrical rollers 7, causing plastic deformation of their surface, thereby achieving the strengthening treatment of the cylindrical roller surface. Because the width of the snap-fit ​​groove 61 is smaller than the radius of the cylindrical roller 7, the cylindrical roller 7 is reliably confined within the snap-fit ​​groove 61 and will not fall into the reinforcing groove 62, while maintaining sufficient exposed area for the impact ball 8 to act. A space larger than the diameter of the impact ball 8 is left between the impact plate 63 and the rotating shaft 4, ensuring that the impact ball 8 can smoothly tumble and collide within the reinforcing groove 62. The closed design of the inlet / outlet 51 on the rotating drum 5 ensures the safety and reliability of the equipment under rotating conditions.

[0015] The above embodiments are merely one preferred embodiment of the present utility model. Ordinary changes and substitutions made by those skilled in the art within the scope of the present utility model's technical solution are all included within the protection scope of the present utility model.

Claims

1. A cylindrical roller surface strengthening device, comprising a fixed frame and a drive motor, wherein a fixed cylinder is disposed on the fixed frame, a roller strengthening assembly is disposed inside the fixed cylinder, and the output end of the drive motor is connected to the roller strengthening assembly to drive the roller strengthening assembly to rotate, characterized in that: The roller reinforcement assembly includes a rotating shaft, a rotating cylinder connected to the rotating shaft, and a snap-fit ​​cylinder fixed to the rotating cylinder. The snap-fit ​​cylinder has several snap-fit ​​grooves along its circumference that mate with cylindrical rollers. The snap-fit ​​cylinder has a reinforcement groove inside for inserting impact balls. Several impact plates are arranged circumferentially on the inner diameter surface of the snap-fit ​​cylinder.

2. The cylindrical roller surface strengthening device according to claim 1, characterized in that: The width of the snap-fit ​​groove is smaller than the radius of the cylindrical roller.

3. The cylindrical roller surface strengthening device according to claim 1, characterized in that: The inner diameter surface of the impact plate is provided with several impact plates at equal intervals along the circumference, and the radial distance between the impact plate and the rotating shaft is greater than the diameter of the impact ball.

4. The cylindrical roller surface strengthening device according to claim 1, characterized in that: The snap-fit ​​grooves are equidistantly arranged along the circumference of the snap-fit ​​cylinder and there are multiple of them. On one side end face of the rotating cylinder along the axial direction, there is an inlet and outlet for the cylindrical roller to enter and exit, corresponding to the snap-fit ​​groove position.

5. The cylindrical roller surface strengthening device according to claim 1, characterized in that: The drive motor is connected to the rotating drum via a transmission belt, which is directly fitted onto the outer diameter surface of the rotating drum.

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