Mandrel fixing device for ring rolling mill
By designing a mandrel fixing device for the ring rolling mill, and utilizing the combination of an electric push rod and a spring clamp, the problem of easy damage to the mandrel under high temperature and high stress environment was solved, achieving stable fixing, extending service life and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-11
- Publication Date
- 2026-03-17
AI Technical Summary
The existing ring rolling mill mandrel is prone to damage under complex environments such as high temperature, high stress, friction, impact and corrosion, resulting in frequent failures, reduced accuracy, and insecure clamping and misalignment, which affects the machining accuracy and service life.
A mandrel fixing device for a ring rolling mill was designed, including a bracket, a base plate, a rotating device, and a power drive device. Through the cooperation of an electric push rod and a spring clamp, the mandrel can be adjusted and fixed to prevent movement and bending, thereby enhancing stability.
It improves the lifespan of the mandrel, reduces production costs, decreases the frequency of failures and replacements, and ensures machining accuracy.
Smart Images
Figure CN223997207U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of ring rolling mill core shaft, specifically relating to a ring rolling mill core shaft fixing device. Background Technology
[0002] A ring rolling mill is a forging and pressing device used to manufacture ring-shaped parts. It achieves wall thickness reduction, diameter expansion, and cross-sectional profile shaping through continuous localized plastic deformation. During the ring rolling process, the mandrel of the rolling mill experiences friction due to relative movement with the high-temperature metal billet, leading to a temperature increase. The high temperature can soften the mandrel material itself, causing thermal fatigue and oxidation. Moreover, the mandrel needs to withstand radial and axial pressure from the metal billet. High stress can easily lead to fatigue cracks and plastic deformation. Uneven deformation of the billet and equipment vibration during the ring rolling process also impact the mandrel. The mandrel operates in a complex environment with high temperature, high stress, friction, impact, corrosion, and dust, and must possess properties such as high strength, wear resistance, heat resistance, and corrosion resistance, as well as regular maintenance and extended service life.
[0003] In the current ring rolling mill, the mandrel bears the weight of a high-temperature circular ring while also being squeezed by the drive roller. Under prolonged continuous operation, technical problems such as malfunction, decreased accuracy, high replacement frequency, and easy breakage may occur. Furthermore, the mandrel may suffer from problems such as insecure clamping and inaccurate alignment, causing unnecessary stress and bending during the ring rolling process. Due to the heavy weight of the forging itself and the excessive pressure applied to the mandrel by the drive roller, the mandrel is prone to bending and damage, thus affecting the processing accuracy of the product. Utility Model Content
[0004] To solve the above-mentioned technical problems, this utility model provides a mandrel fixing device for a ring rolling mill. It has a simple structure and is easy to operate. By fixing the mandrel in the mandrel fixing device, damage to the mandrel during the ring rolling process is avoided, the service life of the mandrel is increased, and the production cost is reduced.
[0005] The technical solution adopted by this utility model is as follows: a mandrel fixing device for a ring rolling mill, comprising a bracket, a base plate, a rotating device, and a power drive device. The rotating device and the bracket are mounted on the power drive device via the base plate. The bracket is fixed to the front of the base plate. One end of the rotating device is fixed to the base plate, and the other end is fixed to the bracket. The bracket includes two upright plates disposed on the left and right sides of the front of the base plate. A fixing shaft plate for fixing the mandrel is disposed in the middle of the upright plates. A mandrel fixing hole is provided at the upper end of the fixing shaft plate. A bearing is disposed in the mandrel fixing hole, and a bushing is disposed in the bearing. The rotating device includes an electric push rod and an ear plate. The tail end of the electric push rod is fixed to the base plate at one end via an ear plate, and the other end of the shaft is fixed to the bracket via an ear plate. The base plate is mounted on the power drive device to realize the reciprocating motion of the base plate. The power drive device includes a motor, gears, racks, a set of guide rails, two sets of sliders, and a base plate. The set of guide rails is located on the left and right sides of the base plate, and the set of racks is located in the middle of the guide rails. The output end of the motor is connected to the gears through the base plate. The gears are located in the middle of a set of parallel racks and mesh with the racks for linear motion along the racks. Two sets of sliders are mounted on the guide rails, and the base plate is connected to the sliders by bolts.
[0006] Specifically, the front end of the mandrel is provided with a mandrel sleeve that matches the mandrel. The mandrel sleeve includes a fastening sleeve and a positioning shaft. The positioning shaft is provided near the right end of the inner circumference of the fastening sleeve. An elastic clamp is fixedly provided on the positioning shaft. Two elastic arms are integrally formed on the elastic clamp. A positioning post is fixedly provided on the tail end of the elastic arm.
[0007] Specifically, the inner circumference of the bushing is provided with a positioning groove for accommodating the positioning post. The positioning post matches the positioning groove to fix the position of the mandrel bushing inside the bushing and prevent the mandrel from moving back and forth during the rolling process.
[0008] Specifically, the fixed shaft plate is provided with an ear plate, and the output shaft end of the electric push rod is fixedly connected to the ear plate through a clamping piece. The fixed shaft plate is fixed in the middle of the two vertical plates through a movable shaft, and the angle of the fixed shaft plate can be adjusted as needed by the electric push rod.
[0009] The beneficial effects of this utility model are as follows: 1. This utility model has a simple structure and is easy to assemble. The mandrel sleeve is placed on the front end of the mandrel, and the mandrel fixing device is delivered to the processing station by controlling the power drive device. The mandrel sleeve is inserted into the mandrel fixing device, thereby completing the fixing of the mandrel.
[0010] 2. By fixing the mandrel inside the bushing through this utility model and securing it with the bushing, problems such as loose clamping and misalignment of the mandrel are avoided. This reduces unnecessary stress on the mandrel during the ring rolling process, preventing bending, reducing the frequency of replacement, increasing the service life of the mandrel, and reducing production costs. Attached Figure Description
[0011] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0012] Figure 2 This is a schematic diagram of the power drive device of this utility model;
[0013] Figure 3 This is a schematic diagram of the bushing structure of this utility model;
[0014] Figure 4 This is a cross-sectional view (AA) of the bushing of this utility model.
[0015] The markings in the diagram are: 1. Bracket; 2. Base plate; 3. Rotating device; 4. Power drive device; 5. Vertical plate; 6. Fixed shaft plate; 7. Mandrel fixing hole; 8. Bushing; 9. Electric push rod; 10. Ear plate; 11. Motor; 12. Gear; 13. Rack; 14. Guide rail; 15. Slider; 16. Base plate; 17. Mandrel sleeve; 18. Fastening bushing; 19. Positioning shaft; 20. Elastic clamp; 21. Elastic arm; 22. Positioning post; 23. Positioning groove. Detailed Implementation
[0016] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.
[0017] like Figure 1-4 As shown, a mandrel fixing device for a ring rolling mill includes a bracket 1, a base plate 2, a rotating device 3, and a power drive device 4. The rotating device 3 and the bracket 1 are mounted on the power drive device 4 via the base plate 2. The bracket 1 is fixed to the front of the base plate 2. One end of the rotating device 3 is fixed to the base plate 2, and the other end is fixed to the bracket 1. The bracket 1 includes two upright plates 5 on the left and right sides of the front of the base plate 2. A fixing shaft plate 6 for fixing the mandrel is provided in the middle of the upright plates 5. A mandrel fixing hole 7 is provided at the upper end of the fixing shaft plate 6. A bearing is provided in the mandrel fixing hole 7, and a bushing 8 is provided in the bearing. The rotating device 3 includes an electric push rod 9 and an ear plate 10. The tail end of the electric push rod 9 is fixed to the base plate 4 via the ear plate 10. On the base plate 2, the other end of the shaft is fixed to the bracket 1 by the ear plate 10. The base plate 2 is set on the power drive device 4 to realize the reciprocating motion of the base plate 2. The power drive device 4 includes a motor 11, a gear 12, a rack 13, a set of guide rails 14, two sets of sliders 15, and a base plate 16. A set of guide rails 14 is set on the left and right sides of the base plate 16, and a set of racks 13 is set in the middle of the guide rails 14. The output end of the motor 11 is connected to the gear 12 through the base plate 16. The gear 12 is set in the middle of the parallel set of racks 13 and meshes with the racks 13 for transmission, and is used to make linear motion along the racks 13. Two sets of sliders 15 are set on the guide rails 14, and the base plate 2 is connected to the sliders 15 by bolts.
[0018] Preferably, the front end of the mandrel is provided with a mandrel sleeve 17, the mandrel sleeve 17 includes a fastening sleeve 18 and a positioning shaft 19. The positioning shaft 19 is provided near the right end of the inner circumference of the fastening sleeve 18. An elastic clamp 20 is fixedly provided on the positioning shaft 19. Two elastic arms 21 are integrally formed on the elastic clamp 20. A positioning post 22 is fixedly provided on the tail end of the elastic arm 21.
[0019] Preferably, the inner circumference of the bushing 8 is provided with a positioning groove 23 for accommodating the positioning post 22. The positioning post 22 matches the positioning groove 23 to fix the position of the mandrel 17 inside the bushing 8 and prevent the mandrel from moving back and forth during the rolling process.
[0020] Preferably, the fixed shaft plate 6 is provided with an ear plate, and the output shaft end of the electric push rod is fixedly connected to the ear plate through a clamping piece. The fixed shaft plate 6 is fixed between the two upright plates 5 through a movable shaft, and the angle of the fixed shaft plate 6 can be adjusted as needed by the electric push rod 9.
[0021] During operation, the mandrel sleeve 17 is placed at the front end of the mandrel, and the motor 11 is started. The output end of the motor 11 is connected to the gear 12 through the base plate 16. The gear 12 is located in the middle of a set of parallel racks 13 and meshes with the racks 13 for transmission, which is used to make linear motion along the racks 13. Two sets of sliders 15 are provided on the guide rail 14. The base plate 2 is connected to the slider 15 by bolts. The bracket 1 on the base plate 2 can be adjusted in angle by the electric push rod 9. After the bracket 1 is moved to the fixed position, the mandrel sleeve 17 is fixed in the bushing 8 on the bracket 1. The mandrel sleeve 17 can be moved left and right to move the positioning post 22 into the positioning groove 21 through the spring clamp 20, thereby fixing the mandrel sleeve 17 in the bushing 8, thus completing the fixing of the mandrel.
Claims
1. A roller ring core shaft fixing device, characterized in that: A kind of roller ring machine core shaft fixing device, it is characterized in that: support (1), base plate (2), rotating device (3), power drive device (4), the rotating device (3) and support (1) are arranged on power drive device (4) by base plate (2), the support (1) is fixed in the front of base plate (2), rotating device (3) one end is fixed on base plate (2), the other end is fixed on support (1), the support (1) includes the two vertical boards (5) for being arranged in the left and right sides of the front of base plate (2), the fixed shaft plate (6) for fixing core shaft is arranged in the middle of vertical board (5), the fixed shaft plate (6) upper end is provided with core shaft fixing hole (7), bearing is arranged in core shaft fixing hole (7), bearing is provided with shaft sleeve (8) in, the rotating device (3) includes electric push rod (9), lug (10), the tail end of electric push rod (9) is fixed on base plate (2) by lug (10) one end, the other end shaft end is fixed on support (1) by lug (10), base plate (2) is arranged on power drive device (4), for realizing the reciprocating motion of base plate (2) front and back, power drive device (4) includes motor (11), gear (12), rack (13), a group of guide rails (14), two groups of sliding blocks (15), bottom plate (16), the group of guide rails (14) is arranged in the left and right sides of bottom plate (16), the group of rack (13) is arranged in the middle of guide rail (14), the motor (11) output end is connected gear (12) by bottom plate (16), gear (12) is arranged in the middle of the group of rack (13) and is in meshing transmission with rack (13), for doing linear motion along rack (13), guide rail (14) is provided with two groups of sliding blocks (15), and the base plate (2) is connected by bolt on sliding block (15).
2. A roller ring core shaft fixing device as claimed in claim 1, characterized in that: The front end of the core shaft is provided with a core shaft sleeve (17), the core shaft sleeve (17) includes a fastening sleeve (18), a positioning shaft (19), a positioning shaft (19) is arranged on the inner circumference of the fastening sleeve (18) near the right end, a elastic clamp (20) is fixedly arranged on the positioning shaft (19), two elastic arms (21) are integrally formed on the elastic clamp (20), a positioning column (22) is fixedly arranged on the tail end of the elastic arm (21).
3. A roller ring core shaft fixing device as claimed in claim 2, characterized in that: A positioning groove (23) for accommodating the positioning column (22) is arranged on the inner circumference of the shaft sleeve (8), the positioning column (22) matches the positioning groove (23), for fixing the position of the core shaft sleeve (17) in the shaft sleeve (8), and preventing the core shaft from moving back and forth during rolling.
4. A roller ring core shaft fixing device as claimed in claim 3, characterized in that An ear plate is arranged on the fixed shaft plate (6), the output shaft end of the electric push rod is fixedly connected with the ear plate through a clamping piece, the fixed shaft plate (6) is fixedly arranged on the middle of the two vertical boards (5) through a movable shaft, the angle of the fixed shaft plate (6) can be adjusted by the electric push rod (9) as needed.