A split-type plum blossom head roller and a manufacturing method thereof
By designing a modular plum blossom head roll, using alloy forged steel and induction hardened plum blossom shaft heads connected to the main roll neck, the problem of severe wear of the plum blossom head roll is solved, thus extending the roll life and making effective use of resources.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SINOSTEEL XINGTAI MACHINERY & MILL ROLL
- Filing Date
- 2022-09-29
- Publication Date
- 2026-05-19
AI Technical Summary
Existing plum blossom head rolls suffer severe wear during multi-pass reversible rolling, resulting in short roll life and difficulty in repair, leading to resource waste.
Design an assembled plum blossom head roll. The plum blossom head is connected to the main roll neck by a key, interference fit and high-strength bolts. The plum blossom head is made of alloy forged steel and undergoes induction hardening treatment. The plum blossom groove and the keyway are staggered by 45° to distribute the force.
It extends the service life of the rolls, reduces replacement and maintenance costs, avoids resource waste, and allows for the repair of worn rolls.
Smart Images
Figure CN115502213B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of rolling mill manufacturing technology, and in particular to an assembled plum blossom head rolling mill and its preparation method. Background Technology
[0002] A two-roll single-stand rolling mill has rolls with sprite-shaped drive ends. Due to the multi-pass reversible rolling process, the sprite-shaped ends of the rolls are subjected to enormous impact torque, and the arc-shaped sides of the sprite-shaped ends often suffer severe wear. This is especially true for high-speed steel rolls, whose working layer is made of high-speed steel, which is very wear-resistant, 2-3 times that of ordinary conventional materials. However, the roll neck is made of ductile iron, and its service life differs greatly from that of the roll body. Due to severe wear, the entire roll becomes unusable, resulting in waste, and its weldability is poor, making repair difficult.
[0003] Therefore, it is necessary to study a detachable sprite head roll that can change the material of the sprite head of the roll neck without excessively increasing the cost of the roll, while extending the service life of the roll. At the same time, the sprite head of the roll can be replaced if it is severely worn. Summary of the Invention
[0004] The technical problem to be solved by the present invention is to provide an assembled plum blossom head roll and its preparation method. One objective of the present invention is to provide an assembled plum blossom head roll in which the plum blossom head and the main roll neck of the roll are assembled into a complete roll in a later stage. The material of the plum blossom head of the roll can be replaced and selected as needed. Another objective of the present invention is to provide a specific preparation method for the assembled plum blossom head roll. This method can not only be used to manufacture new rolls, but also to replace the plum blossom head of the original one-piece plum blossom head roll when its plum blossom head is severely worn, according to the method of this application.
[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:
[0006] A type of assembled plum blossom head roll has a plum blossom shaft head that is a stepped cylinder. The end face of the main roll neck is provided with a stepped cylindrical hole that matches the stepped cylinder of the plum blossom shaft head. The large end cylinder of the plum blossom shaft head is provided with a plum blossom groove. Each plum blossom groove has a bolt through hole on its inner end face. The plum blossom shaft head is connected to the main roll neck by bolts.
[0007] A further improvement of the technical solution of the present invention is that: a number of closed keyways are provided on the small end cylinder of the plum blossom shaft head along the axial direction, and a number of open keyways are provided on the inner wall of the stepped cylindrical hole of the main roll neck. The plum blossom shaft head and the main roll neck end face are keyed together, and the cylindrical hole of the plum blossom shaft head and the main roll neck end face are interference fit.
[0008] A further improvement to the technical solution of this invention is that the plum blossom shaft head is made of alloy forged steel.
[0009] A method for preparing an assembled plum blossom head roll includes the following steps:
[0010] Step 1: Machining stepped cylindrical holes on the neck end face of the main roll, with small-diameter holes at the deep end and large-diameter holes on the outer side. Machining 4 sets of threaded holes on the bottom surface of the large-diameter holes and machining 4 evenly distributed open keyways on the inner wall of the small-diameter holes.
[0011] Step 2: Four plum blossom grooves are evenly semi-finished on the large end cylinder of the plum blossom shaft head, and two bolt through holes are machined on the inner end face of each plum blossom groove; four closed keyways are evenly distributed on the small end cylinder, and one bolt hole is provided at the bottom of each closed keyway.
[0012] Step 3: Perform surface induction hardening on the arc surface of each plum blossom groove of the plum blossom shaft head at a certain distance from the root;
[0013] Step 4: Pre-install the key in the closed keyway of the plum blossom shaft head, fix it with bolts, and place it in the coolant to cool.
[0014] Step 5: Insert the frozen plum blossom shaft head and key into the stepped cylindrical hole on the end face of the main roller neck, and fix the plum blossom shaft head to the end face of the main roller neck using high-strength bolts, threaded holes on the bottom of the large-diameter hole, and bolt through holes.
[0015] Step 6: After the plum blossom shaft head returns to room temperature, precision machine the plum blossom groove to the required specifications, and spot weld the high-strength bolts to prevent loosening.
[0016] A further improvement to the technical solution of the present invention is that the closed keyway on the plum blossom shaft head is offset from the plum blossom groove by 45°.
[0017] A further improvement of the technical solution of the present invention is that: the four sets of threaded holes on the bottom surface of the large-diameter hole are evenly distributed, in pairs, and symmetrically distributed on the same diameter circle with respect to the central axis section of the plum blossom groove; the high-strength bolts are evenly divided into four groups, in pairs, located at the root of the plum blossom groove.
[0018] The method for preparing an assembled plum blossom head roll of this application can also be used to repair the wear of the plum blossom head of the plum blossom head roll. The worn plum blossom head is cut off from the connection between the plum blossom head and the main roll neck of the integral plum blossom head roll, and then the plum blossom shaft head is made and the end face of the main roll neck of the original roll is processed in accordance with the preparation method described in the above claims.
[0019] The technological advancements achieved by this invention due to the adoption of the above technical solutions are as follows:
[0020] This invention employs multiple connection methods, including keys, interference fits, and high-strength bolts, to securely connect the plum blossom head and the main roll neck end face, ensuring connection strength. Furthermore, the keyway and plum blossom groove are staggered by 45° to distribute stress. The plum blossom head is made of alloy forged steel, and the arc surface of the plum blossom groove undergoes induction hardening, resulting in high hardness and improved wear resistance. This achieves the same service life as the roll body. Even if the plum blossom head is severely worn and needs replacement, the original plum blossom head can be disassembled and replaced with a new one, reducing costs and extending the service life of the plum blossom head roll. Simultaneously, the method of this application can also be applied to the repair of worn plum blossom heads in original integrated plum blossom head rolls, avoiding resource waste and extending the service life of the original roll. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the assembly of the plum blossom shaft head and the neck end face of the main roll of the present invention;
[0022] Figure 2 yes Figure 1 Side view;
[0023] Figure 3 This is a schematic diagram of a plum blossom-shaped axle head;
[0024] Figure 4 yes Figure 3 Side view;
[0025] Among them, 1. plum blossom shaft head, 2. key, 3. main roller neck, 4. high-strength bolt, 5. plum blossom groove, 7. bolt, 8. large diameter hole, 9. small diameter hole, 11. large end cylinder, 12. small end cylinder, 13. bolt through hole, 14. closed keyway, 15. bolt hole. Detailed Implementation
[0026] The present invention will be further described in detail below with reference to embodiments:
[0027] like Figures 1-4 As shown, an assembled plum blossom head roll includes a plum blossom head 1, which is a stepped cylinder. The end face of the main roll neck 3 has a stepped cylindrical hole that mates with the stepped cylinder of the plum blossom head. The large end cylinder 11 of the plum blossom head 1 has plum blossom grooves 5, each with a bolt through hole 13 on its inner end face. The small end cylinder 12 of the plum blossom head 1 has several closed keyways 14 arranged axially, up to four in number, evenly distributed on the small end cylinder 12. Four evenly distributed open keyways are machined on the inner wall of the stepped cylindrical hole of the main roll neck 3. The plum blossom head 1 is bolted to the end face of the main roll neck 3, and the end faces of the plum blossom head 1 and the main roll neck 3 are keyed together. Simultaneously, the cylindrical holes of the plum blossom head 1 and the main roll neck 3 are interference-fitted. The plum blossom head 1 is made of alloy forged steel.
[0028] A method for preparing an assembled plum blossom head roll specifically includes the following steps:
[0029] Step 1: Machining a stepped cylindrical hole on the end face of the main roll neck 3, with a small diameter hole 9 at the deep end and a large diameter hole 8 on the outer side. Machining 4 sets of threaded holes on the bottom surface of the large diameter hole 8. The 4 sets of threaded holes are evenly distributed, in pairs, and symmetrically distributed on the same diameter circle with respect to the central axis section of the plum blossom groove 5. Machining 4 evenly distributed open keyways on the inner wall of the small diameter hole 9.
[0030] Step 2: Four plum blossom grooves 5 are evenly semi-finished on the large end cylinder 11 of the plum blossom shaft head 1. Two bolt through holes 13 are machined on the inner end face of each plum blossom groove 5. Four closed keyways 14 are evenly distributed on the small end cylinder 12. Each closed keyway 14 has a bolt hole 15 at the bottom. The closed keyways 14 on the plum blossom shaft head 1 are offset from the plum blossom grooves 5 by 45°.
[0031] Step 3: Perform surface induction hardening on the arc surface of each plum blossom groove 5 of the plum blossom shaft head at a certain distance from the root, which is 20-30mm.
[0032] Step 4: Pre-install key 2 in the closed keyway 14 of the plum blossom shaft head, fix it with bolt 7, and put it into the coolant to cool.
[0033] Step 5: Insert the frozen plum blossom shaft head 1 and key 2 into the stepped cylindrical hole on the end face 3 of the main roller neck. Fix the plum blossom shaft head 1 to the end face of the main roller neck 3 through the high-strength bolts 4, the threaded hole on the bottom of the large-diameter hole 8 and the bolt through hole 13. The high-strength bolts 4 are divided into four groups, two in each group, and fixed at the root of the plum blossom groove 5.
[0034] Step 6: After the plum blossom shaft head 1 returns to normal temperature, precision machine the plum blossom groove 5 to the required specifications, and spot weld the high-strength bolts 4 to prevent loosening.
[0035] The method for preparing the detachable plum blossom head roll of this application can also be used to repair the wear of the plum blossom head of the plum blossom head roll. The worn plum blossom head is cut off from the connection between the plum blossom head and the main roll neck of the integral plum blossom head roll, and then the plum blossom shaft head is made and the end face of the main roll neck of the original roll is processed accordingly according to the preparation method described in the above claims.
[0036] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims
1. A method for preparing an assembled plum blossom head roll, characterized in that: Includes the following steps: Step 1: Machining a stepped cylindrical hole in the end face of the main roll neck (3), with a small diameter hole (9) at the deep end and a large diameter hole (8) on the outside. Machining 4 sets of threaded holes on the bottom surface of the large diameter hole (8). Machining 4 evenly distributed open keyways on the inner wall of the small diameter hole (9). The 4 sets of threaded holes on the bottom surface of the large diameter hole (8) are evenly distributed, in pairs. Step 2: For the large end cylinder (11) of the stepped cylindrical plum blossom shaft head (1), four plum blossom grooves (5) are uniformly semi-finished. Two bolt through holes (13) are machined on the inner end face of each plum blossom groove (5). Four closed keyways (14) are uniformly machined on the small end cylinder (12). Each closed keyway (14) has a bolt hole (15) at the bottom. The closed keyways (14) on the plum blossom shaft head (1) are offset from the plum blossom grooves (5) by 45°. The high-strength bolts (4) are evenly divided into four groups of two, located at the root of the plum blossom grooves (5). Step 3: Perform surface induction hardening on the arc surface of each plum blossom groove (5) of the plum blossom shaft head, which is more than 20mm from the root. Step 4: Pre-install the key (2) in the closed keyway (14) of the plum blossom shaft head, fix it with bolts (7), and put it into the coolant to cool; Step 5: Insert the frozen plum blossom shaft head (1) and key (2) into the stepped cylindrical hole on the end face of the main roller neck (3), and fix the plum blossom shaft head (1) on the end face of the main roller neck (3) through the high-strength bolt (4), the threaded hole on the bottom of the large-diameter hole (8) and the bolt through hole (13); Step 6: After the plum blossom shaft head (1) is restored to normal temperature, the plum blossom groove (5) is precision machined to the required specifications, and the high-strength bolt (4) is spot welded to prevent loosening.
2. The method for preparing an assembled plum blossom head roll according to claim 1, characterized in that: This method can be used to repair the wear of the plum blossom head of a plum blossom head roll. The worn plum blossom head is cut off from the connection between the plum blossom head and the main roll neck of the integral plum blossom head roll. Then, the plum blossom head is made according to the preparation method described in the above claims, and the end face of the main roll neck of the original roll is processed accordingly.