Multi-module combined plate type cross wedge rolling die and corrugated shaft rolling method

Abstract

The invention discloses a multi-module combined plate-type cross wedge rolling die, relates to the technical field of cross wedge rolling, overcomes the defects that in the prior art, the inside and the outside of a machined corrugated shaft are stripped, and a roller type rolling machine is too large in size, and mainly adopts the technical scheme that the multi-module combined plate-type cross wedge rolling die is used for solving the problems. A forming space used for forming a corrugated shaft is formed between the two forming supporting assemblies. At least one of the two forming supporting assemblies is a first track assembly, a plurality of adjacent transverse rolling modules form a forming wedge, pre-extrusion stripes are further arranged on a plurality of track plates in front of the forming wedge, or the two forming supporting assemblies are a second track assembly and a third track assembly, the second track assembly is provided with pre-extrusion stripes, and the third track assembly is provided with pre-extrusion stripes. And the third track assembly is provided with a forming wedge consisting of a plurality of same adjacent transverse rolling modules, so that the corrugated shaft sequentially passes through the pre-extrusion stripes and the forming wedge during forming. The invention further discloses a rolling method for machining the corrugated shaft through the die.

Description

Technical Field

[0001] The present application relates to the technical field of wedge cross rolling, and in particular to a multi-module combined plate-type wedge cross rolling die and a corrugated shaft rolling method. Background Art

[0002] The corrugated shaft can combine the advantages of different materials to achieve the effect of "1+1>2". For example, the cost of 42CrMo / 45 steel corrugated shaft can be reduced by half compared with pure axle steel shaft. In the prior art, heterogeneous metal corrugated shafts are mainly prepared by the following two methods: First, using explosively composited bars and using wedge cross rolling or forging processes to complete subsequent forming. However, this method has the problems of numerous procedures and lengthy processes, and the cost of explosive welding is high and the efficiency is low, which makes it difficult to meet the needs of mass production of axles; second, the inner and outer surfaces of the two bars are first ground and the ends are welded, and then the wedge cross rolling process is used to directly roll them into shape. However, the corrugated shaft prepared by this method has a straight interface between the inner shaft and the outer shaft, and the bonding strength is relatively limited. When facing bending, torsion, shearing, compression and other loads in the subsequent service process, it is easy to cause interface cracking and internal and external peeling, which cannot meet the requirements of axial shear resistance and circumferential torsion resistance of the corrugated shaft.

[0003] The existing technology usually uses roller rolling machines to process shaft parts, but since roller wedge rolling requires the use of complete round rollers for processing, as the diameter of the rolled piece increases and the axial length increases, the diameter of the wedge rolling mold increases significantly, resulting in an increase in the size of the equipment body. Therefore, roller wedge rolling will occupy a larger space, and there will be great technical difficulties in processing the mold onto an arc-shaped surface, resulting in high production costs for the processing rollers and high costs for the wedge rolling equipment, which seriously restricts the promotion of the wedge rolling technology. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art in processing the internal and external peeling of the corrugated shaft and the excessive size of the roller rolling machine, the present application provides a multi-module combination of a plate wedge cross-rolling die and a corrugated shaft rolling method, which can reduce the size of the rolling machine and make the formed corrugated shaft have the characteristics of axial shear resistance and circumferential torsion resistance.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: a multi-module combined plate-type wedge cross-rolling die, comprising a frame, two oppositely arranged forming support assemblies arranged on the frame, and a driving member for driving at least one of the forming support assemblies, wherein a forming space for forming a corrugated shaft is formed between the two forming support assemblies; At least one of the two forming support assemblies is a first crawler assembly, the first crawler assembly includes a plurality of crawler shoes, a cross-rolling module is provided on the crawler shoes, a plurality of adjacent cross-rolling modules form a forming wedge, and a plurality of crawler shoes in front of the forming wedge are also provided with pre-extrusion stripes, so that the corrugated shaft passes through the pre-extrusion stripes and the forming wedge in sequence during forming; Or, the two forming support assemblies are a second track assembly and a third track assembly, the second track assembly has pre-extrusion stripes, and the third track assembly has a forming wedge composed of the same plurality of adjacent cross-rolling modules, and when processing the corrugated shaft, the pre-extrusion stripes are arranged in front and the forming wedges are arranged in the back, so that the corrugated shaft passes through the pre-extrusion stripes and the forming wedges in sequence during forming.

[0006] In the above technical solution, the corrugated shaft consists of an inner shaft and an outer shaft sleeved on the outside of the inner shaft. The inner shaft and the outer shaft are fixed by tight fitting and end welding. The pre-extrusion stripes and the forming wedges can be set in various shapes and sizes according to actual product requirements. The working principle of the scheme is: placing the corrugated shaft in the forming space between two forming support assemblies, driving the first track assembly in the forming support assembly to rotate through the driving member, or driving the second track assembly and the third track assembly to rotate, so that when the corrugated shaft is processed, the cylindrical surface of the corrugated shaft first rolls over the pre-extrusion stripes, and after being extruded, an indentation is generated on the outer surface of the outer shaft, and the indentation is transferred to the inner shaft, and then the corrugated shaft continues to roll through the forming wedge, and the indentation on the outer surface of the outer shaft is flattened under the extrusion action of the forming wedge, and at the same time, the indentation on the outer surface is further transferred to the bonding interface between the inner shaft and the outer shaft under the action of the forming wedge, and the outer surface of the finally rolled corrugated shaft is smooth and flat, and the bonding interface between the outer shaft and the inner shaft has a corrugated feature, and finally the formed corrugated shaft is removed from the forming space, and a new unformed corrugated shaft is placed in the forming space to process the next part.

[0007] The present application has the following advantages: the present scheme can not only realize the rolling of the corrugated shaft at high temperature, but also make the inner and outer shaft bonding interface of the corrugated shaft after rolling have corrugated mechanical meshing, and the formed corrugated shaft has the characteristics of axial shear resistance and circumferential torsion resistance. Moreover, no additional process is added in the manufacturing process of the corrugated shaft, and it can be realized by only one rolling process, which will not affect the overall processing efficiency. In addition, compared with the traditional roller rolling machine, the forming wedge of the whole cross-rolling mold is divided into multiple cross-rolling modules, and they are installed on multiple track plates, so that the processing difficulty of the cross-rolling module is further reduced. It only needs to process each part in batches, and then install it on the track plate for assembly. When one of them is scrapped due to processing errors and other reasons, there is no need to scrap the entire wedge cross-rolling, and only the module of this part needs to be reprocessed, which greatly improves the efficiency and economy of processing the cross-rolling mold. Moreover, by increasing the lateral length and reducing the radial height, the rolling length of the mold is guaranteed, and the small volume of the rolling machine is controlled.

[0008] Furthermore, one of the two forming support assemblies is a plate-type support member, and is kept parallel to the track plate of the first track assembly in the forming space.

[0009] By adopting the above-mentioned technical solution, during the rolling process, the plate-type support can better cooperate with the cross-rolling module on the track shoe, so that the corrugated shaft is more evenly stressed under the action of the pre-extrusion stripes and the forming wedges, which helps to ensure the forming quality of the corrugated shaft, especially for the formation of corrugated mechanical meshing at the interface between the inner and outer shafts and the control of the flatness of the outer surface. Furthermore, one of the two forming support assemblies is a roller support, and a cylindrical generatrix on the roller support that is closest to the first crawler assembly remains parallel to the track shoe of the first crawler assembly in the forming space. The above technical solution is adopted, and the roller support is used, which retains the advantages of the roller structure to a certain extent. For example, in the process of supporting the corrugated shaft, the roller support can use its own circular motion characteristics to better adapt to the rolling state of the corrugated shaft during the rolling process. At the same time, in conjunction with the track shoe, the pre-extrusion and forming functions of the horizontal rolling module on the track shoe can be brought into play, so that the traditional roller structure and the new track shoe structure complement each other and optimize the rolling process.

[0012] Furthermore, the protruding height of the forming wedge is higher than the protruding height of the pre-extrusion stripe.

[0013] With the above technical solution, the light extrusion caused by the lower protrusion height of the pre-extrusion stripes produces moderate indentations on the outer surface of the corrugated shaft, which initially changes the shape of the outer surface. Subsequently, the higher protrusion height of the forming wedge can more accurately and completely flatten the previous indentations on the outer surface during the deep extrusion and flattening of the corrugated shaft due to its powerful shaping ability, while ensuring that the outer surface reaches an ideal smooth and flat state after deep deformation, meeting the requirements for the outer surface quality of the corrugated shaft.

[0014] Furthermore, the pre-extrusion stripes are arranged on a plurality of track shoes, the plurality of pre-extrusion stripes are parallel to each other, the plurality of pre-extrusion stripes form a pre-extrusion stripe group, and the width of the pre-extrusion stripe group is less than or equal to the width of the forming wedge at the maximum width.

[0015] With the above technical solution, the width of the pre-extrusion stripe group is less than or equal to the width of the maximum width of the forming wedge. Such a size design can ensure that the corrugated shaft can smoothly transition to the forming wedge for subsequent forming operations after being pre-extruded by the pre-extrusion stripe group. If the width of the pre-extrusion stripe group is too large, the corrugated shaft may have position deviation when entering the forming wedge or fail to accurately align with the forming wedge, affecting the forming effect. The appropriate width setting can make the process from pre-extrusion to forming of the corrugated shaft more natural and smooth, ensuring the continuity of the entire rolling process.

[0016] Furthermore, the cross-rolling module is detachably connected to the track shoe.

[0017] With the above technical solution, during the rolling process, the cross-rolling module may be worn, deformed or damaged after long-term use because it directly contacts and applies pressure to the corrugated shaft to be rolled. When a cross-rolling module has a problem, the detachable connection design makes it easy to remove the cross-rolling module with the problem separately for repair or replacement, without the need to disassemble and process the entire track shoe assembly or even the entire rolling mold on a large scale, which greatly reduces the difficulty and cost of repair and enables rapid resumption of production.

[0018] Furthermore, a first positioning roller and a second positioning roller installed on the frame are provided in the forming space, and the first positioning roller and the second positioning roller are arranged front and back along the moving direction of the track shoe so that the corrugated axis in the forming space is confined between the first positioning roller and the second positioning roller.

[0019] The above-mentioned technical solution is adopted to provide stable support and restraint for the rolling of the corrugated shaft in the forming space by limiting the corrugated shaft between the first positioning roller and the second positioning roller. During rolling, the corrugated shaft is subjected to the extrusion force from the pre-extrusion stripes, forming wedges and other components as well as the power of its own rolling, which may cause shaking or instability. The existence of the first positioning roller and the second positioning roller is like a track, which enables the corrugated shaft to roll smoothly, ensures the stability of the entire rolling process, and is conducive to the smooth progress of each rolling process.

[0020] Furthermore, the track assembly includes a track and a supporting side plate installed on the side of the track, the track extends a guide section axially, and the supporting side plate is provided with a track groove adapted to the guide section for guiding the track route, so that the guide section in the working area extends into the track groove.

[0021] By adopting the above-mentioned technical solution, the track can run in the predetermined direction of the track groove through the cooperation between the guide section and the track groove, so that the travel route of the track can be adjusted differently according to different corrugated shafts. At the same time, the guide section in the working area can transmit the reaction force generated when the track squeezes the corrugated shaft to the supporting side plate, further increasing the strength of the track assembly.

[0022] Furthermore, the track groove at the working area is recessed in a direction away from the working area, and the track groove is provided with a guide opening near the working area.

[0023] By adopting the above-mentioned technical solution, the track groove in the working area is recessed in the direction away from the working area, so that the crawler track in the working area presents a concave processing working area, so that the parts of the positioning assembly can be reduced, the matching relationship between the components is reduced, the corresponding debugging and design are reduced, and the processing efficiency and product economy are improved. The setting of the guide port can provide a more precise guiding effect for the guide section of the crawler track when the crawler track approaches the working area. The existence of the guide port can make timely corrections to the crawler track at the key node when it enters the working area, thereby avoiding the deflection of the crawler track to a great extent.

[0024] A corrugated shaft rolling method of a multi-module combined plate-type wedge cross rolling die, based on the multi-module combined plate-type wedge cross rolling die, comprises the following steps: S100: The inner shaft and the outer shaft before rolling are assembled by a press machine in an interference fit manner, and then welded at the ends; S200: After the welding is completed, the assembled corrugated shaft is sent to a heating furnace for heating; S300: Send the heated corrugated shaft into a multi-module plate-type wedge cross-rolling die, so that the corrugated shaft is located in the positioning assembly; S400: The driving member drives the wedge cross-rolling mill to operate, so that the corrugated shaft passes through the pre-extrusion stripes and the forming wedges in sequence. When the corrugated shaft passes through the pre-extrusion stripes, an indentation is generated on the outer surface of the outer shaft and the indentation is also transmitted to the inner shaft. When the corrugated shaft passes through the forming wedge, the indentation on the outer surface of the outer shaft is flattened under the extrusion action of the forming wedge. At the same time, the indentation on the outer surface is further transmitted to the bonding interface between the inner shaft and the outer shaft under the action of the forming wedge. Finally, the outer surface of the corrugated shaft rolled is smooth and flat, and the bonding interface between the outer shaft and the inner shaft has corrugated characteristics; S500: Take out the formed corrugated shaft from the positioning assembly.

[0025] Adopting the above-mentioned technical scheme, first, the inner shaft and the outer shaft are first interference fit and then welded together, which ensures that the two are tightly connected and lays the foundation for the good performance of the corrugated shaft. Secondly, heating the corrugated shaft after assembly can reduce the yield strength of the material, make the material easier to plastically deform, and make the internal structure more uniform, which is conducive to rolling and quality assurance. Furthermore, the heated corrugated shaft is placed in the positioning component for rolling, which can accurately control its position, ensure the accuracy of the processing path, and improve the rolling accuracy. Then, the wedge cross rolling mill is driven to operate, and the cylindrical surface of the corrugated shaft first rolls over the pre-extrusion stripes. After being extruded, an indentation is generated on the outer surface of the outer shaft, and the indentation is transferred to the inner shaft, and then it continues to roll through the forming wedge. The indentation on the outer surface of the outer shaft is flattened under the extrusion action of the forming wedge. At the same time, the indentation on the outer surface is further transferred to the bonding interface of the inner shaft and the outer shaft under the action of the forming wedge, and finally rolled into a smooth and flat outer surface and a corrugated feature on the bonding interface of the inner and outer shafts. Finally, it is convenient to remove the finished product from the positioning component, which is conducive to subsequent processing and improves the overall production quality and efficiency of the corrugated shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present application is further described below in conjunction with the accompanying drawings: Figure 1 A schematic diagram of a multi-module plate-type wedge cross-rolling die for the present application; Figure 2 is a schematic diagram of a first crawler assembly; Figure 3 This is a schematic diagram of the crawler track after it is unfolded; Figure 4 It is a schematic diagram of Example 5; Figure 5 It is a schematic diagram of Example 4; Figure 6 is an internal schematic diagram of the third crawler assembly in Example 4; Figure 7 A schematic diagram of supporting side panels; Figure 8 It is a full cross-sectional view of the corrugated shaft; Fig. 9 It is a schematic diagram of the corrugated shaft after the pre-extrusion stripes; Fig.10 Schematic diagram of the corrugated shaft after passing through the forming wedge.

[0027] Description of the drawings: 1. Frame; 11. Base; 12. Support column; 2. Forming support assembly; 21. First track assembly; 22. Second track assembly; 23. Third track assembly; 3. Forming space; 4. Track shoe; 41. Forming wedge; 411. Cross-rolling module; 412. Forming front; 413. Forming rear; 42. Pre-extrusion stripes; 5. First positioning roller; 6. Second positioning roller; 7. Support side plate; 71. Track groove; 72. Guide port; 8. Connecting column; 81. Guide section; 9. Clip-on; 91. Gear shaft; 92. Support shaft; 10. Corrugated shaft; 101. Inner shaft; 102. Outer shaft. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0029] The terms "first", "second", etc. in the specification and claims of this application are used to distinguish similar objects, rather than to describe a specific order or sequence. Even if "second" is used to distinguish before a certain technical feature, it does not necessarily indicate that it has "first". It should be understood that in this application, "including" and "having" and any of their variations are intended to cover non-exclusive inclusion. It should be understood that in this application, "multiple" refers to two or more. "And / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, X and / or Y can represent: X exists alone, X and Y exist at the same time, and Y exists alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship. "Contains X, Y and Z", "Contains X, Y, Z" means that X, Y, and Z are all included, "Contains X, Y or Z" means that one of X, Y, and Z is included, and "Contains X, Y and / or Z" means that any one, any two, or three of X, Y, and Z are included.

[0030] The following specific embodiments are used to describe the technical solution of the present application in detail. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0031] Embodiment 1: like Figures 1 to 3 As shown, the present application provides a multi-module combined plate-type wedge cross-rolling die, comprising a frame 1, two oppositely arranged forming support assemblies 2 arranged on the frame 1, and a driving member for driving at least one of the forming support assemblies 2, wherein a forming space 3 for forming a corrugated shaft 10 is formed between the two forming support assemblies 2; At least one of the two forming support assemblies 2 is a first crawler assembly 21, which includes a plurality of crawler shoes 4, on which a transverse rolling module 411 is provided, and a plurality of adjacent transverse rolling modules 411 form a forming wedge 41, and a plurality of crawler shoes 4 in front of the forming wedge 41 are also provided with pre-extrusion stripes 42, so that the corrugated shaft 10 passes through the pre-extrusion stripes 42 and the forming wedge 41 in sequence during forming;

[0031] In the above technical solution, the corrugated shaft 10 consists of an inner shaft 101 and an outer shaft 102 sleeved on the outside of the inner shaft 101. The inner shaft 101 and the outer shaft 102 are fixed by tight fitting and end welding. The pre-extrusion stripes 42 and the forming wedges can be set in various shapes and sizes according to actual product requirements. The working principle of the scheme is: the corrugated shaft 10 is placed in the forming space 3 between the two forming support assemblies 2, and the first crawler assembly 21 in the forming support assembly 2 is driven to rotate by the driving member, so that when the corrugated shaft 10 is processed, the cylindrical surface of the corrugated shaft 10 first rolls over the pre-extrusion stripes 42, and after being extruded, an indentation is generated on the outer surface of the outer shaft 102, and the indentation is transferred to the inner shaft 101, and then the corrugated shaft 10 continues to roll through the forming wedge, and the indentation on the outer surface of the outer shaft 102 is flattened under the extrusion action of the forming wedge, and at the same time, the indentation on the outer surface is further transferred to the bonding interface between the inner shaft 101 and the outer shaft 102 under the action of the forming wedge. Finally, the outer surface of the corrugated shaft 10 rolled is smooth and flat, and the bonding interface between the outer shaft 102 and the inner shaft 101 has a corrugated feature. Finally, the formed corrugated shaft 10 is removed from the forming space 3, and a new unformed corrugated shaft 10 is placed in the forming space 3 to process the next part.

[0032] The present application has the following advantages: the present solution can not only realize the rolling of the corrugated shaft 10 at high temperature, but also make the inner and outer shafts 102 of the corrugated shaft 10 after rolling have corrugated mechanical meshing, and the formed corrugated shaft 10 has the characteristics of axial shear resistance and circumferential torsion resistance. Moreover, no additional process is added in the manufacturing process of the corrugated shaft 10, and it can be realized by only one rolling process, which will not affect the overall processing efficiency. In addition, compared with the traditional roller rolling machine, the forming wedge 41 of the whole cross-rolling mold is divided into multiple cross-rolling modules 411, and it is installed on multiple track shoes 4, so that the processing difficulty of the cross-rolling module 411 is further reduced, and it only needs to process each part in batches, and then install it on the track shoe 4 for assembly. When one of them is scrapped due to processing errors and other reasons, it is not necessary to scrap the entire wedge cross-rolling, and only the module of this part needs to be reprocessed, which greatly improves the efficiency and economy of processing the cross-rolling mold. Moreover, by increasing the lateral length and reducing the radial height, the rolling length of the mold is guaranteed, and the small volume of the rolling machine is controlled.

[0033] Specifically, the pre-extrusion stripe 42 is arranged in front of the forming wedge, and the two forming support assemblies 2 are arranged opposite to each other up and down.

[0034] It can be understood that in other embodiments, the left and right sides can also be arranged relatively.

[0035] Preferably, the adjacent track shoes 4 are closely fitted to ensure the processing continuity of the forming wedge 41. The front end of the pre-extrusion stripe 42 is provided with a transition stripe whose height increases from front to back. The forming wedge includes a forming front portion 412 and a forming rear portion 413 provided at the rear side of the forming front portion 412. The width of the forming front portion 412 increases from an end away from the forming rear portion 413 to an end close to the forming rear portion 413. The height of the forming front portion 412 gradually increases towards the forming rear portion 413.

[0038] By adopting the above technical solution, the pre-extrusion stripes 42 and the forming wedges are sequentially arranged on the same track assembly, so that the corrugated shaft 10 can continuously undergo the two key steps of pre-extrusion and forming when rolling on the track assembly, and the cooperation between the two is tighter. Compared with the connection transition problem that may exist when the pre-extrusion stripes 42 and the forming wedges are arranged on different track assemblies respectively, this arrangement can more effectively ensure the continuity of the corrugated shaft 10 from pre-extrusion to forming during the forming process, so that the corrugated mechanical meshing effect of the interface between the inner and outer shafts 102 and the smooth and flat effect of the outer surface are better.

[0039] Furthermore, the protruding height of the forming wedge is higher than the protruding height of the pre-extrusion stripe 42 .

[0040] With the above technical solution, the light extrusion caused by the lower protrusion height of the pre-extrusion stripe 42 causes a moderate indentation on the outer surface of the corrugated shaft 10, which initially changes the shape of the outer surface. Subsequently, the higher protrusion height of the forming wedge during the deep extrusion and flattening of the corrugated shaft 10 can more accurately and completely flatten the previous indentation on the outer surface due to its strong shaping ability, while ensuring that the outer surface reaches an ideal state of smoothness and flatness after deep deformation, meeting the requirements for the outer surface quality of the corrugated shaft 10.

[0041] Furthermore, the pre-extrusion stripes 42 are arranged on a plurality of track shoes 4, the plurality of pre-extrusion stripes 42 are parallel to each other, the plurality of pre-extrusion stripes 42 form a pre-extrusion stripe 42 group, and the width of the pre-extrusion stripe 42 group is less than or equal to the width of the forming wedge at the maximum width.

[0042] By adopting the above technical solution, the width of the pre-extrusion stripes 42 is less than or equal to the width of the maximum width of the forming wedge. Such a size design can ensure that the corrugated shaft 10 can smoothly transition to the forming wedge for subsequent forming operations after being pre-extruded by the pre-extrusion stripes 42. If the width of the pre-extrusion stripes 42 is too large, the corrugated shaft 10 may have position deviation when entering the forming wedge or fail to accurately align with the forming wedge, affecting the forming effect. The appropriate width setting can make the process from pre-extrusion to forming of the corrugated shaft 10 more natural and smooth, ensuring the continuity of the entire rolling process.

[0043] Furthermore, the transverse rolling module 411 is detachably connected to the track shoe 4 .

[0044] With the above technical solution, during the rolling process, the cross-rolling module 411 directly contacts and applies pressure to the corrugated shaft 10 to be rolled, which may cause wear, deformation or damage after long-term use. When a problem occurs in a cross-rolling module 411, the detachable connection design makes it easy to remove the cross-rolling module 411 with the problem separately for repair or replacement, without the need to disassemble and process the entire track shoe 4 assembly or even the entire rolling mold on a large scale, which greatly reduces the difficulty and cost of repair and enables rapid resumption of production.

[0045] Specifically, the cross-rolling module 411 and the track shoe 4 are detachably connected by bolt connection, snap connection or the like.

[0046] It will be appreciated that the track assembly may use a rather long die, with the die length in this embodiment being close to eight metres, so that a typical wedge-shaped tool design may be used to roll the axle.

[0047] Furthermore, a first positioning roller 5 and a second positioning roller 6 installed on the frame 1 are provided in the forming space 3. The first positioning roller 5 and the second positioning roller 6 are arranged front and back along the moving direction of the track shoe 4 so that the corrugated shaft 10 in the forming space 3 is confined between the first positioning roller 5 and the second positioning roller 6. The first positioning roller 5 and the second positioning roller 6 constitute a positioning assembly.

[0048] By adopting the above technical solution, the corrugated shaft 10 is restricted between the first positioning roller 5 and the second positioning roller 6, which provides stable support and restraint for the rolling of the corrugated shaft 10 in the forming space 3. During rolling, the corrugated shaft 10 is subjected to the extrusion force from the pre-extrusion stripes 42, the forming wedge and other components, as well as the power of its own rolling, and is prone to shaking or instability. The existence of the first positioning roller 5 and the second positioning roller 6 is like a track, which enables the corrugated shaft 10 to roll smoothly, ensuring the stability of the entire rolling process and facilitating the smooth progress of each rolling process.

[0049] Specifically, the frame 1 includes a base 11 and a vertically arranged support column 12 connected to the base 11, the first positioning roller 5 and the second positioning roller 6 are mounted on the support column 12, and the two support forming assemblies are also mounted on the support column 12. It can be understood that in other embodiments of the present invention, the two forming support assemblies 2 are both first crawler assemblies 21.

[0050] Embodiment 2:

[0035] The difference from Example 1 is that the other one of the two forming support assemblies 2 is a plate-type support member, and remains parallel to the track shoe 4 of the first track assembly 21 in the forming space 3 .

[0051] By adopting the above-mentioned technical solution, during the rolling process, the plate-type support can better cooperate with the transverse rolling module 411 on the track shoe 4, so that the corrugated shaft 10 is more evenly stressed under the action of the pre-extrusion stripes 42 and the forming wedges 41, which helps to ensure the forming quality of the corrugated shaft 10, especially for the formation of the corrugated mechanical meshing at the interface of the inner and outer shafts 102 and the control of the flatness of the outer surface.

[0052] It can be understood that in another embodiment, the other of the two forming support assemblies 2 is a roller support, and the cylindrical generatrix on the roller support closest to the first track assembly 21 remains parallel to the track shoe 4 of the first track assembly 21 in the forming space 3.

[0053] The advantage of adopting the above scheme is that the use of roller-type support members retains the advantages of the roller-type structure to a certain extent. For example, in the process of supporting the corrugated shaft 10, the roller-type support member can use its own circular motion characteristics to better adapt to the rolling state of the corrugated shaft 10 during the rolling process. At the same time, in conjunction with the track shoe 4, the pre-extrusion and forming functions of the horizontal rolling module 411 on the track shoe 4 can be brought into play, so that the traditional roller structure and the new track shoe 4 structure complement each other and optimize the rolling process.

[0054] Embodiment 3: The difference from Example 1 is that the two forming support assemblies 2 are a second track assembly 22 and a third track assembly 23, the second track assembly 22 has a pre-extrusion stripe 42, and the third track assembly 23 has a forming wedge 41 composed of the same plurality of adjacent cross-rolling modules 411, and when processing the corrugated shaft 10, the pre-extrusion stripe 42 is arranged in front and the forming wedge is arranged in the back, so that the corrugated shaft 10 passes through the pre-extrusion stripe 42 and the forming wedge in sequence during forming.

[0055] The working principle of the embodiment 3 is: the corrugated shaft 10 is placed in the molding space 3 between the two molding support assemblies 2, and the second crawler assembly 22 and the third crawler assembly 23 are driven by the driving member to rotate, so that the corrugated shaft 10 is processed. It can be understood that in other embodiments of the present application, the second crawler assembly 22 can also be located below the third crawler assembly 23.

[0056] Embodiment 4: like Figures 5 to 7 As shown, for the convenience of the following description, in this embodiment, the first track assembly 21, the second track assembly 22 and the third track assembly 23 are all referred to as track assemblies, and the track assembly includes a track and a supporting side plate 7 installed on the side of the track. The track extends a guide section 81 in the axial direction, and the supporting side plate 7 is provided with a track groove 71 adapted to the guide section 81 for guiding the track route, so that the guide section 81 in the working area extends into the track groove 71.

[0057] By adopting the above-mentioned technical solution, through the cooperation between the guide section 81 and the track groove 71, the track can run in the predetermined direction of the track groove 71, so that the travel route of the track can be adjusted differently according to different corrugated shafts 10. At the same time, the guide section 81 in the working area can transmit the reaction force generated when the track squeezes the corrugated shaft 10 to the supporting side plate 7, further increasing the strength of the track assembly.

[0058] Specifically, the crawler track is connected by a plurality of connecting columns 8 and clamping parts 9 for connecting adjacent connecting columns 8. A track shoe 4 is connected to every two connecting columns 8. The above-mentioned guide section 81 is one end of the axial extension of the connecting column 8. A gear shaft 91 is wrapped in the crawler track. The gear shaft 91 can drive the connecting column 8 to rotate around the gear shaft 91 by meshing with the connecting column 8, and the shaft body of the gear shaft 91 is directly installed on the supporting side plate 7, which can improve the rigidity of the overall crawler assembly.

[0059] Furthermore, the track groove 71 at the working area is recessed in a direction away from the working area, and the track groove 71 is provided with a guide opening 72 near the working area.

[0060] By adopting the aforementioned technical solution, the track groove 71 in the working area is recessed in the direction away from the working area, so that the track in the working area presents a concave processing working area, so that the parts of the positioning assembly can be reduced here, the matching relationship between the components is reduced, the corresponding debugging and design are reduced, and the processing efficiency and product economy are improved. The setting of the guide port 72 can provide a more precise guiding effect for the guide section 81 of the track when the track approaches the working area. The existence of the guide port 72 can correct the track in time at the key node when the track enters the working area, thereby avoiding the deflection of the track to a great extent.

[0061] Embodiment 5: like Figure 4 As shown, a support shaft 92 is provided in the crawler assembly, and the support shaft 92 is provided on the side of the crawler away from the molding space 3. The support shaft 92 is pressed against the crawler shoe 4 of the molding space 3 to support the crawler shoe 4 in the molding space 3 to squeeze the corrugated shaft. The support shaft 92 pushes the crawler in the molding space 3 toward the molding space 3, so that the crawler protrudes outward.

[0062] By adopting the above-mentioned technical solution, through the protruding track plate 4 in the processing area, the distance between the support assembly and the track gradually decreases from far away from the forming space 3 to close to the forming space 3, which makes it easier to place the corrugated shaft into the forming space 3 of the crawler machine, thereby improving the efficiency of production and processing.

[0063] Specifically, since the support shaft 92 protrudes the crawler track toward the forming space 3, the crawler shoe 4 in this embodiment is also correspondingly configured as a crawler shoe 4 structure with a certain curvature.

[0064] Preferably, in order to adapt to the arc-shaped track shoe 4 structure, the same support shaft 92 is set on one side of the track corresponding to the forming space 3, so that the track is also correspondingly convex on the other side to avoid the track shoes 4 from rubbing against each other and being damaged during use, so that the entire first track assembly presents an elliptical form. The curvature of this type of track assembly is equivalent to using a roller with a very large diameter. In comparison, it can retain the advantages of the roller and avoid disadvantages such as excessive volume and inconvenience in manufacturing. Compared with a double-roller rolling mill with a large roller diameter, this rolling mill has the advantage of much smaller torque and can be used to process parts such as railway axles.

[0065] Embodiment 6: like Figures 8 to 10 As shown, a method for rolling a corrugated shaft 10 using a multi-module combined plate-type wedge cross rolling die, based on the multi-module combined plate-type wedge cross rolling die, comprises the following steps: S100: The inner shaft 101 and the outer shaft 102 before rolling are assembled by a press machine in an interference fit manner, and then welded at the ends; S200: After the welding is completed, the assembled corrugated shaft 10 is sent into a heating furnace for heating; S300: sending the heated corrugated shaft 10 into a plate-type wedge cross-rolling die of a multi-module combination, so that the corrugated shaft 10 is located in the positioning assembly; S400: The driving member drives the wedge cross rolling mill to operate, so that the corrugated shaft 10 passes through the pre-extrusion stripe 42 and the forming wedge in sequence. When the corrugated shaft 10 passes through the pre-extrusion stripe 42, an indentation is generated on the outer surface of the outer shaft 102 and the indentation is also transmitted to the inner shaft 101. When the corrugated shaft 10 passes through the forming wedge, the indentation on the outer surface of the outer shaft 102 is flattened under the extrusion of the forming wedge. At the same time, the indentation on the outer surface is further transmitted to the bonding interface between the inner shaft 101 and the outer shaft 102 under the action of the forming wedge. Finally, the outer surface of the corrugated shaft 10 rolled is smooth and flat, and the bonding interface between the outer shaft 102 and the inner shaft 101 has corrugated characteristics. S500: Take out the formed corrugated shaft 10 from the positioning assembly.

[0066] By adopting the above technical solution, first, the inner shaft 101 and the outer shaft 102 are first interference fit and then welded together, which ensures that the two are tightly connected, laying the foundation for the good performance of the corrugated shaft 10. Secondly, heating the corrugated shaft 10 after assembly can reduce the yield strength of the material, making the material easier to plastically deform, and making the internal structure more uniform, which is conducive to rolling and quality assurance. Furthermore, placing the heated corrugated shaft 10 in the positioning assembly for rolling can accurately control its position, ensure the accuracy of the processing path, and improve the rolling accuracy. Then, the wedge cross rolling mill is driven to operate, and the cylindrical surface of the corrugated shaft 10 first rolls over the pre-extrusion stripes 42, and after being extruded, an indentation is generated on the outer surface of the outer shaft 102, and the indentation is transferred to the inner shaft 101, and then it continues to roll through the forming wedge, and the indentation on the outer surface of the outer shaft 102 is flattened under the extrusion of the forming wedge. At the same time, the indentation on the outer surface is further transferred to the bonding interface of the inner shaft 101 and the outer shaft 102 under the action of the forming wedge, and finally rolled into a smooth and flat outer surface and a corrugated feature on the bonding interface of the inner and outer shafts 102. Finally, it is convenient to remove the finished product from the positioning assembly, which is conducive to subsequent processing and improves the production quality and efficiency of the corrugated shaft 10 as a whole.

[0067] In addition to the above-mentioned preferred embodiments, the present application also has other implementation modes. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present application.

Claims

1. A multi-module plate-type wedge cross-rolling die, characterized in that: The invention comprises a frame (1), two oppositely arranged forming support assemblies (2) arranged on the frame (1), and a driving member used to drive at least one of the forming support assemblies (2); a forming space (3) for forming a corrugated shaft (10) is formed between the two forming support assemblies (2); At least one of the two forming support assemblies (2) is a first crawler assembly (21), the first crawler assembly comprising a plurality of crawler shoes (4), a transverse rolling module (411) being provided on the crawler shoes (4), a plurality of adjacent transverse rolling modules (411) forming a forming wedge (41), and a plurality of crawler shoes (4) in front of the forming wedge (41) are also provided with pre-extrusion stripes (42), so that the corrugated shaft (10) passes through the pre-extrusion stripes (42) and the forming wedge (41) in sequence during forming; Alternatively, the two forming support assemblies (2) are a second track assembly (22) and a third track assembly (23), the second track assembly (22) having a pre-extrusion stripe (42), and the third track assembly (23) having a forming wedge (41) composed of a plurality of adjacent transverse rolling modules (411), and when processing the corrugated shaft (10), the pre-extrusion stripe (42) is arranged in front and the forming wedge (41) is arranged in the back, so that the corrugated shaft (10) passes through the pre-extrusion stripe (42) and the forming wedge (41) in sequence during forming.

2. A multi-module plate-type wedge cross-rolling die according to claim 1, characterized in that: One of the two molding support assemblies (2) is a plate-type support member and is kept parallel to the track plate (4) of the first track assembly (21) in the molding space (3).

3. The multi-module plate-type wedge cross-rolling die according to claim 1, characterized in that: One of the two forming support assemblies (2) is a roller support, and the cylindrical generatrix on the roller support closest to the first crawler assembly (21) remains parallel to the crawler shoe (4) of the first crawler assembly (21) in the forming space (3).

4. The multi-module plate-type wedge cross-rolling die according to claim 1, characterized in that: The protruding height of the forming wedge (41) is higher than the protruding height of the pre-extrusion stripe (42).

5. The multi-module plate-type wedge cross-rolling die according to claim 1, characterized in that: The pre-extrusion stripes (42) are arranged on a plurality of track shoes (4), the plurality of pre-extrusion stripes (42) are parallel to each other, the plurality of pre-extrusion stripes (42) form a pre-extrusion stripe (42) group, and the width of the pre-extrusion stripe (42) group is less than or equal to the width of the forming wedge (41) at the maximum width.

6. The multi-module plate-type wedge cross-rolling die according to claim 1, characterized in that: The cross-rolling module (411) is detachably connected to the track shoe (4).

7. The multi-module plate-type wedge cross-rolling die according to claim 1, characterized in that: A first positioning roller (5) and a second positioning roller (6) mounted on the frame (1) are provided in the molding space (3); the first positioning roller (5) and the second positioning roller (6) are arranged front and rear along the moving direction of the track shoe (4) so ​​that the corrugated shaft (10) in the molding space (3) is confined between the first positioning roller (5) and the second positioning roller (6).

8. The multi-module plate-type wedge cross-rolling die according to claim 1, characterized in that: The crawler track assembly comprises a crawler track and a supporting side plate (7) mounted on the side of the crawler track, wherein the crawler track extends a guide section (81) in the axial direction, and the supporting side plate (7) is provided with a track groove (71) adapted to the guide section (81) for guiding the crawler track route, so that the guide section (81) in the working area extends into the track groove (71).

9. The multi-module plate-type wedge cross-rolling die according to claim 8, characterized in that: The track groove (71) at the working area is recessed in a direction away from the working area, and the track groove (71) is provided with a guide opening (72) near the working area.

10. A method for rolling a corrugated shaft using a multi-module combined plate-type wedge cross-rolling die, characterized in that: The plate-type wedge cross-rolling die of the multi-module combination according to any one of claims 1 to 9 comprises the following steps: S100: The inner shaft (101) and the outer shaft (102) before rolling are assembled by a press machine in an interference fit manner, and then welded at the ends; S200: After welding is completed, the assembled corrugated shaft (10) is sent into a heating furnace for heating; S300: sending the heated corrugated shaft (10) into a multi-module combined plate-type wedge cross-rolling die, so that the corrugated shaft (10) is located in the positioning assembly; S400: The driving member drives the wedge cross rolling mill to operate, so that the corrugated shaft (10) passes through the pre-extrusion stripe (42) and the forming wedge (41) in sequence. When the corrugated shaft (10) passes through the pre-extrusion stripe (42), an indentation is generated on the outer surface of the outer shaft (102) and the indentation is also transmitted to the inner shaft (101). When the corrugated shaft (10) passes through the forming wedge (41), the indentation on the outer surface of the outer shaft (102) is flattened under the extrusion action of the forming wedge (41). At the same time, the indentation on the outer surface is further transmitted to the bonding interface between the inner shaft (101) and the outer shaft (102) under the action of the forming wedge (41). Finally, the outer surface of the corrugated shaft (10) rolled is smooth and flat, and the bonding interface between the outer shaft (102) and the inner shaft (101) has corrugated characteristics. S500: Take out the formed corrugated shaft (10) from the positioning assembly.

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