An axle rolling device

Abstract

The utility model belongs to the field of rail transit equipment manufacturing, concretely relates to an axle roll -pressing device, including gyre, roll -pressing head, oil distribution device, the gyre sets up the top of lathe feed mechanism, roll -pressing head installs on the gyre, oil distribution device installs on roll -pressing head, roll -pressing head adopts two back -to -back opposite settings form to form a group, and can switch on the gyre. The utility model realizes the dynamic stability under the complex shaft type axle surface working condition through the cooperation of gyre and roll -pressing head, and is favorable to quick dismounting and cleaning, reduces the downtime maintenance time to reach efficient production adaptation, realizes the synergistic breakthrough of machining precision, equipment reliability and production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of rail transit equipment manufacturing, specifically relating to an axle rolling device, which uses a rolling head rotary table to strengthen the irregular curved surfaces of the axle body of rail vehicles using corresponding rolling heads. Background Technology

[0002] As a core load-bearing component of the running gear, the surface integrity of the axle of a rail vehicle directly affects the vehicle's load-bearing performance and operational safety. Under complex operating conditions, the axle is subjected to cyclic impact loads caused by track joints and alternating stresses generated by running bumps. It is constantly under high load and sliding friction coupling, which easily induces fatigue cracks on its surface. The progressive propagation of these cracks eventually leads to fatigue failure of the component. Therefore, improving the wear resistance and fatigue resistance of axle materials through surface modification has significant engineering value.

[0003] Current finishing processes primarily employ grinding technology to ensure dimensional accuracy and surface roughness of axles. However, the residual tensile stress induced by this process significantly weakens the fatigue strength and corrosion resistance of the material, becoming a potential cause of crack initiation. To address this technical bottleneck, the engineering field widely adopts roll forming for surface modification. This technology achieves a three-tiered strengthening mechanism through controlled plastic deformation: first, the surface metal undergoes plastic flow to form a dense fibrous structure; second, increased dislocation density induces work hardening; and third, a gradient residual compressive stress field is constructed. This composite strengthening effect can simultaneously improve surface hardness, enhance wear resistance, and improve fatigue resistance, thereby effectively optimizing the service performance of axles.

[0004] The existing axle rolling strengthening process used by rail vehicle axle manufacturers has certain limitations: most manufacturers use CNC lathes or manual labor to clamp small arc rolling tools in the tool post position of ordinary lathes to strengthen the surface of the arc and straight sections of the axle. CNC lathes are only suitable for polishing and rolling operations below 5kN; due to the low rolling force, the strengthening effect is not significant enough to meet the demands of modern high-strength axle rolling strengthening. Furthermore, different axle types and sections require adjustments to the angle and position of the rolling tools, making the operation complex and costly in terms of manpower and resources, thus hindering the transformation and upgrading of the rail transit equipment manufacturing industry towards an intelligent and flexible production model. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies and provide an axle rolling device. This device uses a rotary rolling head to efficiently meet the high-strength rolling requirements of arc and straight sections of different axle types, effectively ensuring the stability and reliability of the axle rolling process, improving the rolling strengthening quality of the axle, and significantly enhancing the fatigue resistance of the axle surface. This provides a new technological paradigm for the full life-cycle reliability of key components in rail transit.

[0006] This utility model is achieved through the following technical solution: an axle rolling device, including a rotating body, a rolling head, and an oil distribution device; the rotating body is arranged above the machine tool feed mechanism, the rolling head is installed on the rotating body, and the oil distribution device is installed on the rolling head; the rolling head is arranged in a back-to-back configuration to form a group, and can be switched on the rotating body.

[0007] Furthermore, the rotating body includes a rotary table, a column, a servo motor, bearings, a worm gear, and a hydraulic cylinder body; the rotary table is mounted on the column via bearings, the worm gear is mounted on the bottom cylindrical surface of the rotary table via a key and engages with the worm, the hydraulic cylinder body is mounted on the rotary table via screws, and the motor is mounted outside the column and connected to the worm.

[0008] Furthermore, the rolling head includes a piston rod, a roller shaft, rolling rollers, bearings, guide sleeves, a cylinder head, sealing rings, guide keys, and roller end caps. Cylinder heads are installed on both sides of the cylinder body, and guide sleeves are installed on the cylinder heads. After the sealing rings are installed on the piston rod, it is inserted into the cylinder body. The roller shaft is fixed to the piston rod. The rolling rollers cooperate with the roller shaft through bearings. Roller end caps are installed on both sides of the rolling rollers. The bearings are tightened by set screws through threaded holes on the piston rod. Two guide keys are provided on the grooves on both sides of the guide sleeve. The rolling rollers at both ends of the cylinder body are fixed to the roller shaft by two back-to-back tapered roller bearings.

[0009] Furthermore, the oil distribution device includes a rotary shaft, bearings, flanges, end caps, and rotary joints. The rotary shaft is mounted on the cylinder body and is connected to the column via bearings. The end caps and rotary joints are mounted on the rotary shaft.

[0010] Furthermore, the rotary joint is mounted on the end cover, and the rotary joint has a cavity inside for supplying lubricating oil and hydraulic oil to the equipment.

[0011] Compared with the prior art, this utility model provides an axle rolling device with the following significant advantages: the rotary rolling head base structure composed of the rotating body and the rolling head achieves dynamic stability under complex axle shape and axle surface working conditions, and facilitates quick disassembly and cleaning, reduces downtime maintenance time, achieves high-efficiency production adaptation, and realizes a synergistic breakthrough in processing accuracy, equipment reliability and production efficiency. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 This utility model provides a cross-sectional view of a rolling device for high-strength rolling reinforcement of axles.

[0014] Figure 2 This utility model provides a cross-sectional view of the rolling head of a rolling device for high-strength rolling reinforcement of axles.

[0015] Figure 3 This utility model provides a cross-sectional view of the rolling wheel of a rolling device for high-strength rolling reinforcement of axles.

[0016] Figure 4 This is a perspective view of a rolling device for high-strength rolling reinforcement of axles provided by this utility model.

[0017] The components include: 1. Rotary body; 2. Rolling head; 3. Oil distribution device; Rotary table 101, column 102, servo motor 103, first bearing 104, worm gear 105, cylinder body 106; piston rod 201, roller shaft 202, rolling roller 203, second bearing 204, guide sleeve 205, cylinder head 206, sealing ring 207, guide key 208, roller end cover 209; rotary shaft 301, third bearing 302, flange 303, end cover 304, rotary joint 305. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0019] Reference Figures 1 to 4 As shown, this utility model provides an axle rolling device, including a rotating body 1, a rolling head 2, and an oil distribution device 3. The rolling heads 2 are arranged in a back-to-back configuration to form a set, and can be switched on the rotating body 1. The rolling heads 2 include two specifications, respectively used for processing cylindrical sections and arc sections.

[0020] The rotating body 1 includes a rotary table 101, a column 102, a servo motor 103, a first bearing 104, a worm gear 105, and a cylinder body 106; wherein the rotary table 101 is mounted on the column 102 via the first bearing 104, the worm gear 105 is mounted on the bottom cylindrical surface of the rotary table 101 via a key and engages with the worm, the cylinder body 106 is mounted on the rotary table 101 via screws, and the servo motor 103 is mounted on the outside of the column 102 and connected to the worm. The roller head 2 includes a piston rod 201, a roller shaft 202, a roller 203, a second bearing 204, a guide sleeve 205, a cylinder head 206, a sealing ring 207, a guide key 208, and a roller end cap 209. The cylinder head 206 is installed on both sides of the cylinder body 106. The guide sleeve 205 is installed on the cylinder head 206 with screws. After the sealing ring 207 is installed on the piston rod 201, it is inserted into the cylinder body 106. The roller shaft 202 is installed on the piston rod 201 with screws. The roller 203 cooperates with the roller shaft 202 through the second bearing 204. The roller end caps 209 are installed on both sides of the roller 203. The second bearing 204 is pressed by set screws through the threaded holes on the piston rod 201. Two guide keys 208 are installed on the grooves on both sides of the guide sleeve 205 through set screws, so that the extension and retraction movement of the roller head is stable. The rolling rollers 203 at both ends of the cylinder body 106 are fixed to the roller shaft 202 by two tapered roller bearings mounted back to back.

[0021] The oil distribution device 3 includes a rotary shaft 301, a third bearing 302, a flange 303, an end cover 304, and a rotary joint 305. The rotary shaft 301 is mounted on the cylinder body 106 by screws. The third bearing 302 is installed at the stepped part of the rotary shaft 301. The flange 303 presses the third bearing 302 to cooperate with the column 102. The end cover 304 is installed on the end face of the rotary shaft 301. The rotary joint 305 is installed on the end cover 304. The rotary joint 305 has a cavity inside for supplying lubricating oil and hydraulic oil to the equipment.

[0022] Hydraulic oil enters the cavity of cylinder body 106 through rotary joint 305, and the extension and retraction of piston rod 201 is controlled by proportional valve to adjust rolling pressure.

[0023] After receiving instructions from the CNC system, the servo motor 103 drives the rotary table 101 to rotate around the column 102 via the worm gear 105, thereby adjusting the angle of the rolling head 2 in the horizontal plane. In conjunction with the axial feed of the machine tool, it performs adaptive rolling on different diameter sections of the axle and the arc sections of the conical surface.

[0024] The arrangement of the rolling head 2 in this invention enables the rolling device to maintain good stability during high-intensity rolling operations, significantly improving the dimensional accuracy, surface uniformity and process reliability of precision rolling processing, while effectively improving production efficiency, and is easy to clean and replace during use.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An axle rolling device, characterized in that, It includes a rotating body, a rolling head, and an oil distribution device; the rotating body is positioned above the machine tool feed mechanism, the rolling head is mounted on the rotating body, and the oil distribution device is mounted on the rolling head; the rolling heads are arranged in a set of two back-to-back and can be switched on the rotating body.

2. The axle rolling device according to claim 1, characterized in that: The rotating body includes a rotary table, a column, a servo motor, bearings, a worm gear, and a cylinder body. The rotary table is mounted on the column via bearings, the worm gear is mounted on the bottom cylindrical surface of the rotary table via a key and engages with the worm, the cylinder body is mounted on the rotary table via screws, and the motor is mounted on the outside of the column and connected to the worm.

3. The axle rolling device according to claim 1, characterized in that: The rolling head includes a piston rod, a roller shaft, a rolling roller, a bearing, a guide sleeve, a cylinder head, a sealing ring, a guide key, and a roller end cap. The cylinder head is installed on both sides of the cylinder body, and the guide sleeve is installed on the cylinder head. After the sealing ring is installed on the piston rod, it is inserted into the cylinder body. The roller shaft is fixed on the piston rod. The rolling roller cooperates with the roller shaft through the bearing. The roller end cap is installed on both sides of the rolling roller. The bearing is pressed tightly by a set screw through the threaded hole on the piston rod. The guide sleeve has two guide keys on its two sides.

4. The axle rolling device according to claim 1, characterized in that: The oil distribution device includes a rotary shaft, bearings, flanges, end caps, and rotary joints. The rotary shaft is mounted on the cylinder body and is connected to the column via bearings. The end caps and rotary joints are mounted on the rotary shaft.

5. The axle rolling device according to claim 3, characterized in that: The rolling roller is fixed to the roller shaft by two tapered roller bearings mounted back to back.

6. The axle rolling device according to claim 4, characterized in that: The rotary joint is mounted on the end cap, and the rotary joint has a cavity inside.

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