A casting cold straightening device

Abstract

The application discloses a castings cold straightening device and belongs to the castings straightening field. The application comprises a cylindrical workpiece and a pushing assembly clamped at one end of the workpiece, the pushing assembly can drive the workpiece to rotate around an axis, push the workpiece to move in the axial direction or push the workpiece to move spirally in the axial direction. An inner support assembly is arranged inside the workpiece, the inner support assembly can gradually support outwardly to realize outward straightening from the inside of the workpiece. An outer roller assembly is arranged outside the workpiece, the outer roller assembly can be tangent to the outer wall of the workpiece, the outer roller assembly can gradually extrude the workpiece inwardly, and the outer roller assembly can rotate around the axis of the workpiece. The inner support assembly can gradually support outwardly, the application has the advantages of preventing the workpiece from being overloaded instantaneously and improving the uniformity. The outer roller assembly is arranged to form a roller straightening and prevent local stress from being too large.

Description

A casting cold straightening device Technical Field

[0001] This invention belongs to the field of casting straightening, and specifically relates to a casting cold straightening device. Background Technology

[0002] Castings are metal shaped objects obtained by various casting methods. They are objects with a certain shape, size and properties obtained by pouring, injecting, sucking or other casting methods into a pre-prepared mold after smelting liquid metal, cooling and then grinding.

[0003] The advantages of casting are that, in mass production, the unit cost is significantly lower than that of forging and machining. Additionally, it offers high material utilization and effectively reduces waste. The disadvantages are that castings often experience deformation during the manufacturing process. For example, in the mass production of hydraulic cylinder barrels made of low-carbon steel, uneven stress or cooling can easily lead to elliptical shape defects. To meet usage requirements, straightening is necessary.

[0004] The commonly used straightening method is hot straightening, which involves heating the casting to a plastic state and then straightening it using a press or mold. This method has disadvantages such as high energy consumption and long production cycle, and may introduce new thermal stress, causing uneven stress within the casting and resulting in dimensional instability. Summary of the Invention

[0005] To address the aforementioned shortcomings, this invention provides a cold straightening device for castings, which has the advantages of low energy consumption and short cycle time, and does not introduce new thermal stress during straightening.

[0006] This invention protects a cold straightening device for castings. The device includes a cylindrical workpiece and a propulsion assembly clamped at one end of the workpiece. The propulsion assembly can drive the workpiece to rotate around an axis, push the workpiece to translate along the axial direction, or push the workpiece to move spirally along the axial direction.

[0007] An internal support assembly is disposed inside the workpiece. The internal support assembly includes a hollow cylindrical support body. Support strips are provided on the side wall of the support body. The support strips can gradually support outwards to achieve straightening from the inside to the outside of the workpiece.

[0008] The outer roller assembly is disposed outside the workpiece. The outer roller assembly includes a first frame and a second frame that are identical and arranged in parallel. The inner sides of the first frame and the second frame are tangent to the outer wall of the workpiece. Both the first frame and the second frame are able to gradually press the workpiece inward. Both the first frame and the second frame are able to rotate around the axis of the workpiece.

[0009] Furthermore, the outer roller assembly includes a first frame and a second frame that are identical and arranged in parallel. The first frame is formed by three first hydraulic rods connected end to end to form an equilateral triangle frame; the second frame is formed by three second hydraulic rods connected end to end to form an equilateral triangle frame.

[0010] A rotating roller is rotatably provided between the corresponding endpoints of the first frame and the second frame, and the rotating roller can rotate around its own axis.

[0011] The outer roller assembly also includes a magnetic component that can generate a magnetic field, which can induce eddy currents on the workpiece.

[0012] Furthermore, the magnetic component includes a first inner magnet and a second inner magnet arranged in parallel, the first inner magnet and the second inner magnet being respectively disposed in the gap between adjacent rollers;

[0013] An internal magnetic field is formed between the first internal magnet and the second internal magnet. A portion of the workpiece is disposed within the internal magnetic field. When the workpiece moves relative to the internal magnetic field, eddy currents are generated on the workpiece.

[0014] Furthermore, the magnetic component includes a first outer magnet and a second outer magnet arranged in parallel.

[0015] When the workpiece moves along the axis, the first external magnet and the second external magnet are disposed on the first frame or the second frame opposite to the direction of movement of the workpiece.

[0016] An external magnetic field is formed between the first external magnet and the second external magnet. The workpiece is placed within the external magnetic field. When the workpiece moves relative to the external magnetic field, eddy currents are generated on the workpiece.

[0017] Furthermore, the inner support assembly includes a hollow cylindrical support body, the two ends of which are fixedly connected to the central axis;

[0018] At least four support bars are evenly provided on the side wall of the support body, and the support bars can move radially along the support body;

[0019] The support body is equipped with a hydraulic cylinder, which can achieve bidirectional synchronous extension and retraction along the axial direction. The extended end of the hydraulic cylinder is hinged to the support bar through a hinge bar, which can convert the axial movement of the extended end into the radial movement of the support bar.

[0020] Furthermore, the hydraulic cylinder includes a cylinder body, and a hydraulic rod is provided at each end of the cylinder body. A fixing ring is provided on the hydraulic rod, and the fixing ring is connected to the support bar through the hinge bar.

[0021] Furthermore, the support body is provided with a groove, and a striking element is provided in the groove. The magnetic element can attract the striking element to extend out of the groove and strike the inner wall of the workpiece to release residual stress.

[0022] Furthermore, the striking element includes a striking plate, which is rotatably disposed in the groove via a rotating shaft. A striking ball is provided on the top surface of the first end of the striking plate, and the bottom surface of the first end of the striking plate is connected to the bottom surface of the groove via a spring.

[0023] Furthermore, the propulsion assembly includes an annular disk with three sliders evenly distributed on it, the sliders being movable radially along the disk;

[0024] The slider is provided with a first clamping member and a second clamping member that are only different in size. The first clamping member and the second clamping member can both be adjusted in position on the slider. The first clamping member and the second clamping member respectively abut against the inner and outer walls of the workpiece.

[0025] Furthermore, the slider includes two parallel bars arranged in parallel, and a slide rail is formed between the two parallel bars;

[0026] The first clamping member includes a base block, which is slidably disposed in the slide rail. A central rod is fixedly disposed on the base block, and a fixed plate, a first nut, a clamping column and a second nut are sequentially sleeved on the central rod from bottom to top.

[0027] The clamping post extends out and abuts against the workpiece.

[0028] Beneficial Effects: This invention, by incorporating an internal support component that gradually extends outwards, offers the following advantages: First, it prevents instantaneous overload of the workpiece, reducing the risk of cracking. Compared to its hot state, the workpiece has poor plasticity in its cold state, making it prone to cracking if a large force is applied directly. Second, it improves uniformity. Gradual outward support allows the hard and soft areas of the workpiece to gradually adapt to the supporting force, ensuring uniform force transmission. Third, it reduces stress accumulation. Gradual outward support helps to homogenize the stress in the workpiece, effectively preventing the superposition of new and residual stresses that could damage the workpiece.

[0029] This invention utilizes an outer roller assembly to achieve roller-type straightening. As the outer roller assembly rotates, it wraps around the outside of the workpiece, ensuring uniform force distribution and preventing excessive localized stress. Furthermore, the outer roller assembly gradually presses inward, further reducing stress concentration. The invention also incorporates a propulsion assembly that drives the workpiece to rotate, translate, or spiral. During spiral movement, the supporting force from the inner support assembly is distributed across the workpiece, preventing stress concentration. Combined with the inner support assembly and the outer roller assembly, stress is further reduced or homogenized, resulting in a stable shape after straightening. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] in:

[0032] Figure 1 is a schematic diagram of the overall structure of the casting cold straightening device when straightening a workpiece in one embodiment of the present invention;

[0033] Figure 2 is a schematic diagram of the overall structure of the casting cold straightening device in one embodiment of the present invention;

[0034] Figure 3 is a schematic diagram of the overall structure of the outer roller assembly in one embodiment of the present invention;

[0035] Figure 4 is a schematic diagram of the overall structure of the internal support component in one embodiment of the present invention;

[0036] Figure 5 is a top view of the supporting body in one embodiment of the present invention;

[0037] Figure 6 is a cross-sectional view of the supporting body in Figure 5 along the AA direction;

[0038] Figure 7 is a partial cross-sectional view of the support body in one embodiment of the present invention;

[0039] Figure 8 is a schematic diagram of the connection position of the hinge strip in one embodiment of the present invention;

[0040] Figure 9 is a schematic diagram of the overall structure of the striking element in one embodiment of the present invention;

[0041] Figure 10 is a schematic diagram of the overall structure of the propulsion component in one embodiment of the present invention;

[0042] Figure 11 is a schematic diagram of the structure of the first clamping member, the second clamping member, and the slider assembly in one embodiment of the present invention;

[0043] Figure 12 is a schematic diagram of the structure of the first clamping member and the second clamping member in one embodiment of the present invention;

[0044] In the diagram, 1 is the propulsion assembly; 11 is the disk; 12 is the slider; 121 is the parallel bar; 122 is the slide rail; 13 is the first clamping component; 131 is the base block; 132 is the center rod; 133 is the fixed plate; 134 is the first nut; 135 is the clamping post; 136 is the second nut; and 14 is the second clamping component.

[0045] 2. Outer roller assembly; 21. First hydraulic rod; 22. First outer magnet; 23. Rotary roller; 24. Second hydraulic rod; 25. First auxiliary rod; 26. First inner magnet; 27. Second outer magnet; 28. Second inner magnet; 29. ​​Second auxiliary rod;

[0046] 3. Internal support assembly; 31. Support body; 32. Support bar; 33. Hydraulic cylinder; 331. Cylinder body; 332. Hydraulic rod; 333. Fixing ring; 34. Hinge bar; 35. Central shaft; 36. Striking component; 361. Striking plate; 362. Striking ball; 363. Rotating shaft; 364. Spring;

[0047] 4. Workpiece. Detailed Implementation

[0048] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0049] Referring to Figures 1-12, this invention protects a cold straightening device for castings. The device includes a cylindrical workpiece 4 and a propulsion assembly 1 clamped at one end of the workpiece 4. The propulsion assembly 1 can drive the workpiece 4 to rotate around an axis, push the workpiece 4 to translate along the axis, or push the workpiece 4 to spiral along the axis. The propulsion assembly 1 can be a two-finger parallel clamping structure similar to parallel jaws; a three-finger adaptive clamping structure similar to a three-jaw self-centering chuck; or an electromagnetic clamping structure similar to an electromagnetic chuck. Any method is acceptable as long as it can clamp the workpiece 4. After the propulsion assembly 1 clamps the workpiece 4, an external power structure can be used to make the workpiece 4 translate or rotate.

[0050] The inner support component 3 is located inside the workpiece 4. The inner support component 3 can gradually support outward, realizing the straightening from the inside to the outside of the workpiece 4.

[0051] The outer roller assembly 2 is located outside the workpiece 4. The outer roller assembly 2 is tangent to the outer wall of the workpiece 4. The outer roller assembly 2 can gradually press the workpiece 4 inward. The outer roller assembly 2 can rotate around the axis of the workpiece 4.

[0052] This invention, by incorporating an inner support component 3, provides gradual outward support, offering the following advantages: First, it prevents instantaneous overload of the workpiece 4, reducing the risk of cracking. Compared to its hot state, the workpiece 4 exhibits poor plasticity in its cold state, making it prone to cracking if a large force is applied directly. Second, it improves uniformity. Gradual outward support allows the hard and soft areas of the workpiece 4 to gradually adapt to the supporting force, ensuring uniform force transmission. Third, it reduces stress accumulation. Gradual outward support helps to homogenize the stress in the workpiece 4, effectively preventing the superposition of new and residual stresses that could damage the workpiece 4.

[0053] This invention utilizes an outer roller assembly 2 to achieve roller-type straightening. As the outer roller assembly 2 rotates, it wraps around the outside of the workpiece 4, ensuring uniform force distribution and preventing excessive localized stress. Furthermore, the outer roller assembly 2 gradually presses inward, further reducing stress concentration. The invention also incorporates a propulsion assembly 1, which drives the workpiece 4 to rotate, translate, or move spirally. During spiral movement, the supporting force of the inner support assembly 3 is distributed across the workpiece 4, preventing stress concentration. Together with the inner support assembly 3 and the outer roller assembly 2, stress is further reduced or homogenized, resulting in a stable shape for the workpiece 4 after straightening.

[0054] Referring to Figure 3, in one specific embodiment, the outer roller assembly 2 includes a first frame and a second frame that are identical and arranged in parallel. The first frame is formed by three first hydraulic rods 21 connected end to end to form an equilateral triangle frame; the second frame is formed by three second hydraulic rods 24 connected end to end to form an equilateral triangle frame. A rotating roller 23 is rotatably provided between the corresponding endpoints of the first and second frames, and the rotating roller 23 can rotate around its own axis. The outer roller assembly 2 also includes a magnetic component that can generate a magnetic field, causing eddy currents to form on the workpiece 4.

[0055] Since the first frame and the second frame are identical in size and structure, the first frame will be used for explanation; the second frame has the same effect. In this embodiment, the first frame is set as an equilateral triangle, which has strong stability and is not easily shaken when the roller 23 rotates, ensuring the straightening effect. The first frame is formed by connecting the first hydraulic rods 21. The extension and retraction of the first hydraulic rods 21 can adjust the size of the first frame to accommodate workpieces 4 of different diameters; in addition, the first hydraulic rods 21 can be gradually shortened to gradually apply pressure to the outer wall of the workpiece 4, homogenize the stress, and prevent the workpiece 4 from springing back after straightening. By setting up a magnetic component, a magnetic field can be generated. When the outer roller assembly 2 rotates, it can drive the magnetic component to move, and the magnetic field moves accordingly. When the magnetic field moves relative to the workpiece 4, it can generate eddy currents on the workpiece 4. The eddy currents will generate a small amount of heat in the workpiece 4, which has the following effects: First, it can enhance the activity of metal atoms, weaken the interlattice force, and reduce the yield strength of the workpiece 4 to a certain extent. Second, it adjusts the stress; heating can release internal residual stress and homogenize the stress, making the workpiece less prone to springing back after straightening.

[0056] Referring to Figure 3, in one specific embodiment, the magnetic component includes a first inner magnet 26 and a second inner magnet 28 arranged in parallel, respectively disposed in the gaps between adjacent rotating rollers 23. Specifically, three gaps are formed between the three rotating rollers 23, and a first auxiliary rod 25 and a second auxiliary rod 29, which are parallel to each other, are respectively disposed in two of the gaps. The two ends of the first auxiliary rod 25 are vertically fixed to the first hydraulic rod 21 and the second hydraulic rod 24, respectively, and the first inner magnet 26 is fixedly disposed on the first auxiliary rod 25. The two ends of the second auxiliary rod 29 are also vertically fixed to the first hydraulic rod 21 and the second hydraulic rod 24, respectively, and the second inner magnet 28 is fixedly disposed on the second auxiliary rod 29. An internal magnetic field is formed between the first inner magnet 26 and the second inner magnet 28. Part of the workpiece 4 is disposed within the internal magnetic field. When the workpiece 4 moves relative to the internal magnetic field, eddy currents are generated on the workpiece 4.

[0057] In this embodiment, an internal magnetic field is generated by setting a first internal magnet 26 and a second internal magnet 28, with part of the workpiece 4 placed within the internal magnetic field. When the equilateral triangular frame drives the first internal magnet 26 and the second internal magnet 28 to move, the changing internal magnetic field can produce a magnetostrictive effect. Since the workpiece 4 is a medium-low carbon steel with magnetism, the crystal structure within the workpiece 4 will undergo slight distortion when the internal magnetic field changes, making it easier for the metal lattice to slip and recombine, greatly reducing the yield strength of the workpiece 4. This allows for plastic deformation with a smaller external mechanical force, thus fundamentally avoiding the risk of cracking caused by stress concentration. In addition, the changing internal magnetic field can also form eddy currents on the workpiece 4. The heat generated by the eddy currents can also homogenize the stress and release residual stress during the straightening process, preventing stress from damaging the workpiece 4. In this embodiment, the internal magnetic field can be synchronized with the straightening of the outer roller assembly 2. When the outer roller assembly 2 is straightening, the internal magnetic field can play a role in effectively homogenizing the stress.

[0058] Referring to Figure 3, in one specific embodiment, the magnetic component includes a first outer magnet 22 and a second outer magnet 27 arranged in parallel.

[0059] When workpiece 4 moves along the axis, the first outer magnet 22 and the second outer magnet 27 are disposed on the first or second frame opposite to the direction of movement of workpiece 4. Specifically, taking Figure 1 as an example, assuming workpiece 4 moves from left to right, the first outer magnet 22 and the second outer magnet 27 are disposed on the first frame. Similarly, when workpiece 4 moves from right to left, the first outer magnet 22 and the second outer magnet 27 are disposed on the second frame. The positions of the first outer magnet 22 and the second outer magnet 27 are respectively located at one end of the equilateral triangular frame and on the side directly opposite the end. An external magnetic field is formed between the first outer magnet 22 and the second outer magnet 27, and workpiece 4 is disposed within the external magnetic field. When workpiece 4 moves relative to the external magnetic field, eddy currents are generated on workpiece 4.

[0060] This embodiment generates an external magnetic field by setting a first external magnet 22 and a second external magnet 27. The external magnetic field acts on the workpiece 4 at the position where cold straightening is completed. The purpose of this arrangement is to utilize the magnetostrictive effect and eddy currents generated on the workpiece 4 by the external magnetic field to effectively further eliminate or homogenize stress and prevent the workpiece 4 from rebounding.

[0061] Referring to Figures 4 and 6, in one specific embodiment, the inner support assembly 3 includes a hollow cylindrical support body 31, with both ends of the support body 31 fixedly connected to a central shaft 35. The central shaft 35 is divided into two sections and fixed to both ends of the support body 31. At least four support strips 32 are evenly provided on the sidewalls of the support body 31, and the support strips 32 can move radially along the support body 31.

[0062] The support body 31 is equipped with a hydraulic cylinder 33, which can achieve bidirectional synchronous extension and retraction along the axial direction. The extended end of the hydraulic cylinder 33 is hinged to the support bar 32 through a hinge bar 34, which can convert the axial movement of the extended end into the radial movement of the support bar 32. The hydraulic cylinder 33 can be a commercially available ordinary mechanical hydraulic cylinder with the oil passage set inside the central shaft 35; or it can be a remote-controlled hydraulic cylinder, which is enclosed inside the support body 31.

[0063] This implementation uses a central shaft 35 for two reasons: first, it facilitates the placement of the support body 31 inside the workpiece 4; second, before the straightening operation, the axis of the workpiece 4 needs to be accurately determined, and then the central shaft 35 is aligned with the axis of the workpiece 4 before being externally fixed, ensuring precise straightening of the workpiece 4 by the support body 31. The hinge bar 34 converts the force of the hydraulic cylinder 33 in the axial direction of the support body 31 into the force of the support bar 32 in the radial direction of the support body 31. This allows for higher extension and retraction accuracy of the support bar 32. For example, if the retraction distance of the hydraulic cylinder 33 is 1mm, the hinge bar 34 will transmit the retraction force to the support bar 32, causing the support bar 32 to extend radially. Since the hinge bar 34 is inclined, the extension distance of the support bar 32 will be less than 1mm. This structure is suitable for gradual and precise straightening of the workpiece 4.

[0064] Referring to Figures 6-8, in one specific embodiment, the hydraulic cylinder 33 includes a cylinder body 331, with a hydraulic rod 332 at each end of the cylinder body 331. A fixing ring 333 is provided on each hydraulic rod 332, and the fixing ring 333 is connected to the support rod 32 via a hinge bar 34. Each fixing ring 333 can be hinged to multiple support rods 32.

[0065] In this embodiment, by setting a fixing ring 333, the diameter of the hydraulic rod 332 can be increased, thereby increasing the surface area. More hinge bars 34 can be set at the same time, which facilitates the setting of more support bars 32. The support force of the workpiece 4 is more dispersed by multiple support bars 32, avoiding stress concentration.

[0066] Referring to Figure 6, in one specific embodiment, the support body 31 is provided with a groove, and a striking element 36 is provided in the groove. The magnetic element can attract the striking element 36 to extend from the groove and strike the inner wall of the workpiece 4 to release residual stress. Specifically, the magnetic element mainly refers to the first inner magnet 26 and the second inner magnet 28. Since the two are close to the groove, in a static state, the first inner magnet 26 and the second inner magnet 28 can attract the striking element 36 to extend from the groove and strike the inner wall of the workpiece 4. With the rotation of the outer roller assembly 2, the first inner magnet 26 and the second inner magnet 28 can continuously move closer to and further away from the groove, so that the striking element 36 continuously strikes the inner wall of the workpiece 4.

[0067] In this embodiment, the striking element 36 is provided to strike the workpiece 4, causing it to vibrate slightly. Since the striking element 36 is evenly distributed between adjacent support bars 32, local peak stress will occur at the point where the support bars 32 contact the workpiece 4. The striking element 36 strikes the adjacent support points of the support bars 32, which can slowly release this stress and prevent damage to the workpiece 4. In addition, the vibration can also make the stress on the workpiece 4 more uniform, preventing subsequent rebound.

[0068] Referring to Figure 9, in one specific embodiment, the striking element 36 includes a striking plate 361, which is rotatably disposed within a groove via a pivot 363. A striking ball 362 is provided on the top surface of the first end of the striking plate 361, and the bottom surface of the first end of the striking plate 361 is connected to the bottom surface of the groove via a spring 364. In this embodiment, the striking ball 362 serves two purposes: firstly, it makes the striking surface smooth, preventing damage to the inner surface of the workpiece 4; secondly, it reduces the contact point, thereby generating greater pressure, making the striking of the striking plate 361 more penetrating and extending the vibration transmission distance. The spring 364 allows the striking plate 361 to return to its original position, making the striking more regular.

[0069] Referring to Figures 10 and 11, in one specific embodiment, the propulsion assembly 1 includes an annular disk 11 with three sliders 12 evenly distributed on it. The sliders 12 are movable radially along the disk 11. A first clamping member 13 and a second clamping member 14, differing only in size, are provided on the sliders 12. Both the first clamping member 13 and the second clamping member 14 are adjustable in position on the slider 12, and respectively abut against the inner and outer walls of the workpiece 4.

[0070] In this embodiment, by setting the slider 12, the clamping diameter can be adjusted to clamp workpieces 4 of different diameters. By setting the first clamping member 13 and the second clamping member 14, the clamping accuracy and efficiency can be improved. For example, the first clamping member 13 abuts against the outer wall of the workpiece 4, and the second clamping member 14 abuts against the inner wall of the workpiece 4. When straightening workpieces 4 with the same inner diameter but different outer diameters, only the position of the first clamping member 13 on the slider 12 needs to be adjusted. When straightening workpieces 4 with the same outer diameter but different inner diameters, only the position of the second clamping member 14 on the slider 12 needs to be adjusted.

[0071] Referring to Figures 11 and 12, in one specific embodiment, the slider 12 includes two parallel bars 121 arranged in parallel, the upper surface of the parallel bars 121 having upper anti-slip teeth, and a slide 122 being formed between the two parallel bars 121.

[0072] The first clamping member 13 includes a base block 131, which is slidably disposed within the slide rail 122. A central rod 132 is fixedly mounted on the base block 131. A fixed plate 133, a first nut 134, a clamping post 135, and a second nut 136 are sequentially mounted on the central rod 132 from bottom to top. The lower surface of the fixed plate 133 is provided with lower anti-slip teeth. The clamping post 135 is Z-shaped, with both sides of the clamping post 135 being cylindrical. One side is fitted onto the central rod 132, and the other side extends out and abuts against the workpiece 4. The bottom of the central rod 132 is a threaded rod. Adjusting the first nut 134 allows the fixed plate 133 to be pressed tightly against the parallel bar 121, causing the upper and lower anti-slip teeth to engage. In this embodiment, by setting the fixed plate 133 and the parallel bar 121, the first clamping member 13 can be stably fixed on the slider 12.

[0073] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A cold straightening device for castings, characterized in that, The assembly includes a cylindrical workpiece (4) and a propulsion component (1) clamped at one end of the workpiece (4). The propulsion component (1) can drive the workpiece (4) to rotate around an axis, push the workpiece (4) to translate along the axis, or push the workpiece (4) to move spirally along the axis. An inner support component (3) is disposed inside the workpiece (4). The inner support component (3) includes a hollow cylindrical support body (31). The side wall of the support body (31) is provided with support strips (32). The support strips (32) can gradually support outwards to realize the movement of the workpiece (4) from one end of the workpiece (4). 4) Internal outward straightening; the outer roller assembly (2) is disposed outside the workpiece (4), the outer roller assembly (2) includes a first frame and a second frame that are completely identical and arranged in parallel, the inner sides of the first frame and the second frame can be tangent to the outer wall of the workpiece (4), the first frame and the second frame can gradually squeeze the workpiece (4) inward, the first frame and the second frame can rotate around the axis of the workpiece (4); the first frame is formed by three first hydraulic rods (21) connected end to end to form an equilateral triangular frame; the second frame is formed by three first hydraulic rods (21) connected end to end to form an equilateral triangular frame. Two hydraulic rods (24) are connected end to end to form an equilateral triangular frame; a rotating roller (23) is rotatably provided between the corresponding endpoints of the first frame and the second frame, and the rotating roller (23) can rotate around its own axis; the outer roller assembly (2) also includes a magnetic component, which can generate a magnetic field and generate eddy currents on the workpiece (4); both ends of the support body (31) are fixedly connected to the central shaft (35); at least four support bars (32) are evenly provided on the side wall of the support body (31), and the support bars (32) can move radially along the support body (31). The support body (31) is equipped with a hydraulic cylinder (33) inside. The hydraulic cylinder (33) can achieve bidirectional synchronous extension and retraction along the axial direction. The extended end of the hydraulic cylinder (33) is hinged to the support bar (32) through a hinge bar (34). The hinge bar (34) can convert the axial movement of the extended end into the radial movement of the support bar (32). The support body (31) is provided with a groove. The groove is provided with a striking element (36). The magnetic element can attract the striking element (36) to extend from the groove and strike the inner wall of the workpiece (4) to release residual stress.

2. The casting cold straightening device according to claim 1, characterized in that, The magnetic component includes a first inner magnet (26) and a second inner magnet (28) arranged in parallel. The first inner magnet (26) and the second inner magnet (28) are respectively arranged in the gap between adjacent rollers (23). An internal magnetic field is formed between the first inner magnet (26) and the second inner magnet (28). A part of the workpiece (4) is arranged in the internal magnetic field. When the workpiece (4) moves relative to the internal magnetic field, eddy currents can be generated on the workpiece (4).

3. The casting cold straightening device according to claim 1, characterized in that, The magnetic component includes a first outer magnet (22) and a second outer magnet (27) arranged in parallel. When the workpiece (4) moves along the axis, the first outer magnet (22) and the second outer magnet (27) are arranged on the first frame or the second frame away from the direction of movement of the workpiece (4). An external magnetic field is formed between the first outer magnet (22) and the second outer magnet (27). The workpiece (4) is placed in the external magnetic field. When the workpiece (4) moves relative to the external magnetic field, eddy currents can be generated on the workpiece (4).

4. The casting cold straightening device according to claim 1, characterized in that, The hydraulic cylinder (33) includes a cylinder body (331), and each end of the cylinder body (331) is provided with a hydraulic rod (332). The hydraulic rod (332) is provided with a fixing ring (333), and the fixing ring (333) is connected to the support bar (32) through the hinge bar (34).

5. The casting cold straightening device according to claim 4, characterized in that, The striking element (36) includes a striking plate (361), which is rotatably disposed in the groove via a pivot (363). A striking ball (362) is provided on the top surface of the first end of the striking plate (361), and the bottom surface of the first end of the striking plate (361) is connected to the bottom surface of the groove via a spring (364).

6. The casting cold straightening device according to claim 1, characterized in that, The propulsion assembly (1) includes an annular disk (11) with three sliders (12) evenly distributed on the disk (11). The sliders (12) can move radially along the disk (11). The sliders (12) are provided with a first clamping member (13) and a second clamping member (14) that are only different in size. The first clamping member (13) and the second clamping member (14) can both be adjusted to their positions on the sliders (12). The first clamping member (13) and the second clamping member (14) respectively abut against the inner and outer walls of the workpiece (4).

7. The casting cold straightening device according to claim 6, characterized in that, The slider (12) includes two parallel bars (121) arranged in parallel, and a slide (122) is formed between the two parallel bars (121); the first clamping member (13) includes a bottom block (131), the bottom block (131) is slidably arranged in the slide (122), a center rod (132) is fixedly provided on the bottom block (131), and a fixed plate (133), a first nut (134), a clamping post (135) and a second nut (136) are sequentially sleeved on the center rod (132) from bottom to top; the clamping post (135) extends out and abuts against the workpiece (4).

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