A bush roundness correction device

Abstract

The present application relates to the technical fields of bushing roundness correction forming, and provides a bushing roundness correction device, which comprises a bed body, a mandrel mechanism, a type mold and a horizontal power mechanism; the mandrel mechanism comprises a base, a mandrel mold, a screw rod and a jacking assembly, the base is fixedly connected with the bed body, the jacking assembly is fixedly arranged at the upper end of the base, one end of the screw rod is fixedly connected with the jacking assembly and extends in the horizontal direction, the mandrel mold is sleeved on the other end of the screw rod, and a gap exists between the mandrel mold and the screw rod; the horizontal power mechanism comprises two first hydraulic cylinders and a pressure head arranged at the movable end of the first hydraulic cylinder, the front end of the pressure head is detachably provided with the type mold, the first hydraulic cylinders are symmetrically arranged at the two sides of the base, and the movement direction of the movable end of the first hydraulic cylinder is perpendicular to the extension direction of the screw rod, so that the production efficiency is improved and the defects are reduced.

Description

Technical Field

[0001] This invention relates to the field of bushing roundness correction and forming technology, and more particularly to a bushing roundness correction device. Background Technology

[0002] Engine bushings are critical components that play a vital role in engine function and lifespan. They help position the crankshaft and camshaft, minimize friction during operation, and protect the engine from damage and failure. Sliding bushings, as key components in wind turbine gearboxes, are also considered a technological driver for wind turbine main gearboxes, meeting future demands for increased power density, reliability, and cost. High-performance radial bushings for diesel and gas engines require higher qualities such as durability and wear resistance, making bushings with superimposed coatings made of compliant steel-based composite laminates the ideal choice. Bushing diameters range from Ø50 to Ø500 depending on the application.

[0003] Traditional manufacturing processes for bushings typically involve casting and metal cutting. Bushings made by casting are prone to casting defects such as sand holes, sand inclusions, porosity, and shrinkage. On the other hand, the method of machining blanks into bushings by metal cutting has low material utilization, high manufacturing costs, and low production efficiency, making it unsuitable for mass production. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in related technologies. To this end, the present invention provides a bushing roundness correction device to reduce defects and improve production efficiency.

[0005] This invention provides a bushing roundness correction device, comprising: a bed, a mandrel mechanism, a type mold, and a horizontal power mechanism; the mandrel mechanism includes a base, a mandrel mold, a screw, and a lifting assembly; the base is fixedly connected to the bed, the lifting assembly is fixedly disposed on the upper end of the base, one end of the screw is fixedly connected to the lifting assembly and extends horizontally, the mandrel mold is sleeved on the other end of the screw, and there is a gap between the mandrel mold and the screw; the horizontal power mechanism includes two first hydraulic cylinders and a pressure head disposed on the movable end of the first hydraulic cylinders, the type mold being detachably disposed at the front end of the pressure head; the first hydraulic cylinders are symmetrically disposed on both sides of the base, and the movement direction of the movable end of the first hydraulic cylinder is perpendicular to the extension direction of the screw.

[0006] According to the present invention, a bushing roundness correction device is provided, wherein the lifting assembly includes a second hydraulic cylinder, a first guide rod, a limiting plate and a movable horizontal plate. The bottom end of the second hydraulic cylinder is fixedly connected to the base, and the movable end of the second hydraulic cylinder is fixedly connected to the movable horizontal plate. The first guide rod passes through the movable horizontal plate, and one end of the first guide rod is fixedly connected to the base, and the other end of the first guide rod is fixedly connected to the limiting plate.

[0007] According to a bushing roundness correction device provided by the present invention, the mandrel mechanism further includes a pushing assembly, which includes a third hydraulic cylinder, a second guide rod, a connecting plate, and a pushing rod; the fixed end of the third hydraulic cylinder is fixedly connected to the movable horizontal plate, and the movable end of the third hydraulic cylinder and the second guide rod both penetrate the movable horizontal plate and are fixedly connected to the rear side of the connecting plate; the connecting plate is sleeved on the screw, the moving direction of the connecting plate is consistent with the extending direction of the screw, and a pushing rod is provided on the front side of the connecting plate, the extending direction of the pushing rod being parallel to the extending direction of the screw.

[0008] According to a bushing roundness correction device provided by the present invention, the lifting assembly further includes a limiting rod, one end of which is fixedly connected to the base.

[0009] According to the bushing roundness correction device provided by the present invention, a T-slot is provided on the front side of the connecting plate, and the push rod is slidably disposed in the T-slot.

[0010] According to the bushing roundness correction device provided by the present invention, the mandrel mechanism further includes a first limiting block and a second limiting block, both of which are sleeved on the other end of the screw. The first limiting block is disposed at the front end of the mandrel mold, and the second limiting block is disposed at the rear end of the mandrel mold.

[0011] According to a bushing roundness correction device provided by the present invention, the mandrel mechanism further includes a mold changing assembly, the mold changing assembly including two fourth hydraulic cylinders, the fourth hydraulic cylinders being symmetrically arranged on both sides of the lifting assembly, the movable end of the fourth hydraulic cylinder being fixedly connected to the base, and the fixed end of the fourth hydraulic cylinder being fixedly connected to the bed.

[0012] According to the present invention, a bushing roundness correction device further includes a pull rod disposed on the upper part of the bed for pre-tightening both sides of the bed.

[0013] According to the present invention, a bushing roundness correction device further includes guide rails, which are disposed on both sides of the lifting assembly and fixedly connected to the bed, and the pressure head slides along the guide rails.

[0014] According to the bushing roundness correction device provided by the present invention, the movable end of the first hydraulic cylinder is connected to the pressure head by a ball joint.

[0015] The above-described one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: According to an embodiment of the present invention, a bushing roundness correction device solves the problem of numerous defects in the prior art by setting a mandrel mechanism and a horizontal power mechanism. The spacing between the mandrel mold and the screw increases the degree of freedom of the mandrel mold, so as to better match the mandrel mold with the type mold, reduce processing errors, and improve production efficiency.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this 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 some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a front view of the bushing roundness correction device provided by the present invention.

[0019] Figure 2 This is a front sectional view of the bushing roundness correction device provided by the present invention.

[0020] Figure 3 This is a cross-sectional view of the bushing roundness correction device provided by the present invention in the open state of the mold.

[0021] Figure 4 This is a cross-sectional view of the bushing roundness correction device provided by the present invention in the closed state of the mold.

[0022] Figure 5 This is a partial sectional view of the bushing roundness correction device provided by the present invention from the side.

[0023] Figure 6 This is a perspective view of the bushing roundness correction device provided by the present invention.

[0024] Figure 7 This is a front perspective view of the mandrel mechanism of the bushing roundness correction device provided by the present invention.

[0025] Figure 8 This is a rear perspective view of the spindle mechanism of the bushing roundness correction device provided by the present invention.

[0026] Figure label: 1. Bed; 2. Mandrel Mechanism; 21. Base; 22. Mandrel Mold; 23. Screw; 24. Lifting Assembly; 241. Second Hydraulic Cylinder; 242. First Guide Rod; 243. Limiting Plate; 244. Movable Cross Plate; 245. Limiting Rod; 246. First Contact Switch; 25. Pushing Assembly; 251. Third Hydraulic Cylinder; 252. Second Guide Rod; 253. Connecting Plate; 254. Push Rod; 255. T-Slot; 256. Second Connecting... 26. First limit block; 27. Second limit block; 28. Mold changing assembly; 281. Fourth hydraulic cylinder; 282. Third contact switch; 29. ​​Tooling head; 3. Type mold; 31. Support plate; 4. Horizontal power mechanism; 41. First hydraulic cylinder; 42. Press head; 421. Guide plate; 5. Tie rod; 6. Guide rail; 61. Bottom guide plate; 62. Side guide plate; 63. Upper guide plate; 7. Suspended operating table; 8. Anchor bolt; 9. Steel sleeve. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention. The following embodiments are used to illustrate this invention but cannot be used to limit the scope of this invention.

[0028] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0030] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0032] In related technologies, the mandrel mold in the mandrel mechanism of the bushing roundness correction device is completely fixed at the center of the intersection of the geometric running trajectories of the left and right horizontal loading heads. This structure has strict requirements for the synchronization of the left and right horizontal loading heads. Otherwise, even slight asynchrony when the two heads are loading will cause the mandrel to be subjected to full load shear force by one side of the head during correction. When correcting bushings with thicker walls, the required correction force is often greater, and the mandrel with the inner diameter of the bushing corresponding to the outer dimensions is insufficient to provide the shear resistance required for safe use.

[0033] This invention provides a bushing roundness correction device. An open bushing with an opening of 20-50mm, rolled in the previous stage by a plate rolling machine, is corrected to the correct diameter using this device. After correction, the opening is closed, with a gap ≤0.05mm, and the roundness of the product is controlled within 0.3mm. After correction, the product can be transferred to the next stage for welding and finishing of the joints, without any change in roundness. By changing different mandrel dies and die types, the roundness correction requirements for various bushing products can be met.

[0034] The mandrel mechanism provided by this invention is located at the center of the bed. The center of the mandrel mold is specially designed to have a high degree of freedom. When the horizontal loading cylinder loads and corrects synchronously, the mandrel mold can follow and center, which can make the bushing product thicken evenly during the correction process.

[0035] Figure 1 This is a front view of the bushing roundness correction device provided by the present invention. Figure 2 This is a front sectional view of the bushing roundness correction device provided by the present invention. Figure 3 This is a cross-sectional view of the bushing roundness correction device provided by the present invention in the open state of the mold. Figure 4 This is a cross-sectional view of the bushing roundness correction device provided by the present invention in the closed state of the mold. Figure 5 This is a partial sectional view of the bushing roundness correction device provided by the present invention from the side. Figure 6 This is a perspective view of the bushing roundness correction device provided by the present invention. Figure 7 This is a front perspective view of the mandrel mechanism of the bushing roundness correction device provided by the present invention. Figure 8 This is a rear perspective view of the spindle mechanism of the bushing roundness correction device provided by the present invention.

[0036] This invention provides a bushing roundness correction device, such as... Figures 1 to 8 As shown, the bushing roundness correction device includes: a bed 1, a mandrel mechanism 2, a type mold 3, and a horizontal power mechanism 4; the mandrel mechanism 2 includes a base 21, a mandrel mold 22, a screw 23, and a lifting assembly 24. The base 21 is fixedly connected to the bed 1, the lifting assembly 24 is fixedly disposed on the upper end of the base 21, one end of the screw 23 is fixedly connected to the lifting assembly 24 and extends horizontally, the mandrel mold 22 is sleeved on the other end of the screw 23, and there is a gap between the mandrel mold 22 and the screw 23; the horizontal power mechanism 4 includes two first hydraulic cylinders 41 and a pressure head 42 disposed on the movable end of the first hydraulic cylinders 41. The type mold 3 is detachably disposed at the front end of the pressure head 42. The first hydraulic cylinders 41 are symmetrically disposed on both sides of the base 21, and the movement direction of the movable end of the first hydraulic cylinders 41 is perpendicular to the extension direction of the screw 23.

[0037] In this embodiment, by setting the mandrel mechanism 2 and the horizontal power mechanism 4, the problem of many defects in the prior art is solved. The spacing between the mandrel mold 22 and the screw 23 is set to improve the degree of freedom of the mandrel mold 22, so that the mandrel mold 22 and the type mold 3 can be better matched, reducing processing errors and improving production efficiency.

[0038] According to some embodiments of the present invention, the mandrel mold 22 is sleeved on the screw 23. Since there is a gap between the mandrel mold 22 and the screw 23, in the non-working state, the axis of the screw 23 is at the same height as the axis of the type mold 3. The mandrel mold 22 hangs down and contacts the type mold 3. Before the workpiece is installed on the mandrel mold 22, the lifting component 24 drives the screw 23 to move, lifting the mandrel mold 22 and separating the mandrel mold 22 from the type mold 3. After the workpiece is installed, the lifting component 24 descends, and the two first hydraulic cylinders 41 drive the type mold 3 at the front end of the pressure head 42 to press the workpiece. During the process of the type mold 3 approaching, the mandrel mold 22 adaptively finds the center. Finally, during pressing, the type mold 3, the screw 23 and the mandrel mold 22 are coaxial.

[0039] According to some embodiments of the present invention, the type mold 3 and the pressure head 42 are detachably connected, and the pressure head 42 can be adapted to various types of molds 3, thereby improving the applicability of the calibration device.

[0040] According to some embodiments of the present invention, the mandrel mold 22 is in a floating state during loading, and adaptively finds center, which reduces the positional accuracy requirements of the mandrel mold 22 installation, improves work efficiency, increases the circumferential uniformity of the corrected bushing wall thickness, reduces processing errors, and when the left and right horizontal loading heads 42 are not synchronized, the mandrel and the equipment installation connection are not subjected to force. The material of the mandrel mold 22 can be a material with relatively low mechanical properties, which saves equipment costs and makes it safer to use.

[0041] A bushing roundness correction device provided by the present invention, such as Figure 7 and Figure 8 As shown, the lifting assembly 24 includes a second hydraulic cylinder 241, a first guide rod 242, a limiting plate 243, and a movable horizontal plate 244. The bottom end of the second hydraulic cylinder 241 is fixedly connected to the base 21, and the movable end of the second hydraulic cylinder 241 is fixedly connected to the movable horizontal plate 244. The first guide rod 242 passes through the movable horizontal plate 244, and one end of the first guide rod 242 is fixedly connected to the base 21, while the other end of the first guide rod 242 is fixedly connected to the limiting plate 243.

[0042] In this embodiment, by setting the second hydraulic cylinder 241, the first guide rod 242, the limiting plate 243 and the movable horizontal plate 244 in cooperation, the running stability of the movable horizontal plate 244 during the movement process is improved, the mandrel mold 22 can move up and down actively, which facilitates the lifting and reserved space for material release before pressing. After pressing, the mandrel mold 22 is lifted at the same time as the press head 42 retracts, which facilitates material removal.

[0043] According to some preferred embodiments of the present invention, there are two first guide rods 242, which are respectively disposed at both ends of the second hydraulic cylinder 241, and the first guide rods 242 and the second hydraulic cylinder 241 are arranged in a straight line.

[0044] According to some embodiments of the present invention, the movable end of the second hydraulic cylinder 241 drives the movable horizontal plate 244 to move up and down, and the movable horizontal plate 244 drives the screw 23 to move.

[0045] According to some embodiments of the present invention, the movable horizontal plate 244 moves up and down along the extension direction of the first guide rod 242, and a limit plate 243 is provided at the top end of the first guide rod 242 to prevent the movable horizontal plate 244 from detaching from the first guide rod 242 during movement.

[0046] According to some embodiments of the present invention, the lifting assembly 24 further includes a first contact switch 246, which is disposed on the outer side wall of the movable horizontal plate 244 and cooperates with the type mold 3. The first contact switch 246 closes the second hydraulic cylinder 241 to stop its operation, thereby limiting the position of the screw 23 to coincide with the center position of the type mold 3 and improving the processing accuracy.

[0047] A bushing roundness correction device provided by the present invention, such as Figure 7 and Figure 8 As shown, the mandrel mechanism 2 further includes a pusher assembly 25, which includes a third hydraulic cylinder 251, a second guide rod 252, a connecting plate 253, and a pusher rod 254. The fixed end of the third hydraulic cylinder is fixedly connected to the movable horizontal plate 244. The movable end of the third hydraulic cylinder 251 and the second guide rod 252 both pass through the movable horizontal plate 244 and are fixedly connected to the rear side of the connecting plate 253. The connecting plate 253 is sleeved on the screw 23. The moving direction of the connecting plate 253 is consistent with the extending direction of the screw 23. A pusher rod 254 is provided on the front side of the connecting plate 253. The extending direction of the pusher rod 254 is parallel to the extending direction of the screw 23.

[0048] In this embodiment, automatic unloading is achieved by setting a third hydraulic cylinder 251, a connecting plate 253, and a push rod 254, thereby improving work efficiency.

[0049] According to some embodiments of the present invention, the third hydraulic cylinder 251 drives the connecting plate 253 to move back and forth along the second guide rod 252, and the forward movement of the connecting plate 253 drives the push rod 254 to push the workpiece away from the mandrel mold 22.

[0050] According to some embodiments of the present invention, the pushing assembly 25 further includes a second contact switch 256. During the return stroke of the third hydraulic cylinder 251, the second contact switch 256 closes and the third hydraulic cylinder 251 stops operating, thereby limiting the return position of the connecting plate 253 and preventing excessive impact damage to the lifting assembly 24.

[0051] According to some embodiments of the present invention, the mandrel mold 22 is fitted with the front and rear pusher components 25 for easy material removal. Thus, after pressing, the left and right horizontal loading heads 42 only need to open a very small distance, which is sufficient for the pusher rod 254 to pass through, without the need for long opening and closing, thus saving the equipment's cycle time.

[0052] According to some preferred embodiments of the present invention, two push rods 254 are provided, respectively disposed on both sides of the screw 23, to avoid uneven force on both sides of the workpiece, which would affect the processing process.

[0053] A bushing roundness correction device provided by the present invention, such as Figure 7 As shown, a T-slot 255 is provided on the front side of the connecting plate 253, and the push rod 254 is slidably disposed in the T-slot 255.

[0054] In this embodiment, by setting the T-slot 255 and the push rod 254, the spacing of the push rod 254 can be adjusted, making it more applicable.

[0055] According to some preferred embodiments of the present invention, the size adjustment push rod 254 of the mandrel mold 22 is adjusted to a suitable position and then fixed by a set screw.

[0056] A bushing roundness correction device provided by the present invention, such as Figures 1 to 8 As shown, the mandrel mechanism 2 also includes a first limiting block 26 and a second limiting block 27. The first limiting block 26 and the second limiting block 27 are both sleeved on the other end of the screw 23. The first limiting block 26 is disposed at the front end of the mandrel mold 22, and the second limiting block 27 is disposed at the rear end of the mandrel mold 22.

[0057] In this embodiment, by setting the first limiting block 26 and the second limiting block 27 at the front and rear ends of the mandrel mold 22 respectively, the mandrel mold 22 is fixed, so as to prevent the mandrel mold 22 from shifting in the horizontal direction during the pressing process of the press head 42.

[0058] According to some embodiments of the present invention, the mandrel mechanism 2 further includes a tooling head 29, one end of which is fixedly connected to the movable horizontal plate 244, and the other end of which is fixedly connected to the screw 23.

[0059] According to some preferred embodiments of the present invention, the diameter of the tooling head 29 is larger than the diameter of the screw 23. The tooling head 29 cooperates with the second limiting block 27 and abuts against the second limiting block 27 to fix the second limiting block 27, thereby fixing the mandrel mold 22.

[0060] A bushing roundness correction device provided by the present invention, such as Figure 7 and Figure 8 As shown, the mandrel mechanism 2 also includes a mold changing assembly 28, which includes two fourth hydraulic cylinders 281. The fourth hydraulic cylinders 281 are symmetrically arranged on both sides of the lifting assembly 24. The movable end of the fourth hydraulic cylinder 281 is fixedly connected to the base 21, and the fixed end of the fourth hydraulic cylinder 281 is fixedly connected to the bed 1.

[0061] In this embodiment, a fourth hydraulic cylinder 281 is provided to drive the base 21 to move, so as to facilitate the replacement of the mandrel mold 22.

[0062] According to some embodiments of the present invention, the mold changing assembly 28 further includes a third contact switch 282, which is disposed on the outer side wall of the fourth hydraulic cylinder 281. When the third contact switch 282 is closed, the fourth hydraulic cylinder 281 stops operating, thereby limiting the movement length of the base 21 and preventing the base 21 from falling off the bed 1 and being damaged.

[0063] A bushing roundness correction device provided by the present invention, such as Figure 7 and Figure 8 As shown, the lifting assembly 24 also includes a limiting rod 245, one end of which is fixedly connected to the base 21.

[0064] In this embodiment, a limiting rod 245 is provided to support the movable horizontal plate 244, while preventing the movable horizontal plate 244 from sliding downward during operation, which would affect the machining accuracy and achieve machining stability.

[0065] According to some preferred embodiments of the present invention, the limiting rods 245 are respectively disposed on both sides of the screw 23, and the limiting rods 245 and the guide rods are arranged in a straight line.

[0066] A bushing roundness correction device provided by the present invention, such as Figures 1 to 6 As shown, the bushing roundness correction device also includes a pull rod 5, which is disposed on the upper part of the bed 1 and is used to pre-tighten both sides of the bed 1.

[0067] In this embodiment, the bed 1 is pre-tightened by using the tie rod 5 tool to reduce deformation, increase strength, and improve the overall stability of the equipment.

[0068] According to some preferred embodiments of the present invention, the present application uses a U-shaped bed 1, and the U-shaped bed 1 is pre-tightened by a tie rod 5 to reduce deformation, increase strength, and improve the accuracy of correction.

[0069] According to some embodiments of the present invention, the U-shaped integral horizontal bed 1, the upper horizontal double tie rods 5, and the lock nut constitute the main body of the device. The bed 1 is pre-tightened using a dedicated pre-tightening cylinder. A deformation constraint steel sleeve 9 is installed between the tie rods 5 and the bed 1. This can reduce the longitudinal deformation amplitude of the part above the horizontal center line of the straightening machine during pre-tightening and loading, constrain the longitudinal degree of freedom of the frame, and make the frame form a closed force-bearing frame. During pre-tightening and loading, the frame only undergoes horizontal compression and elongation. The longitudinal deformation is relatively small and symmetrical, which can ensure the stability and reliability of the machine body accuracy.

[0070] A bushing roundness correction device provided by the present invention, such as Figures 2 to 6 As shown, the bushing roundness correction device also includes a guide rail 6, which is disposed on both sides of the lifting assembly 24 and fixedly connected to the bed 1. The pressure head 42 slides along the guide rail 6.

[0071] In this embodiment, by setting the guide rail 6 to cooperate with the pressure head 42, the two pressure heads 42 on both sides are at the same height, thus ensuring processing accuracy.

[0072] According to some preferred embodiments of the present invention, the guide rail 6 is a fully enclosed symmetrical double C-shaped guide rail 6, and the pressure head 42 moves linearly under the constraint of the fully enclosed symmetrical double C-shaped guide rail 6 on the U-shaped bed 1.

[0073] According to some embodiments of the present invention, the cylinder head 42 is provided with a fully enclosed symmetrical double C-shaped guide rail 6 below it. A bottom guide plate 61 and front and rear supports are provided inside the U-shaped bed 1. Side guide plates 62 and upper guide plates 63 are embedded inside the front and rear supports. The bottom guide plate 61, side guide plates 62 and upper guide plates 63 form a symmetrical double C-shaped guide rail group 6. A guide plate 421 is installed at the lower part of the cylinder head 42. The guide plate 421 moves linearly within the enclosed double C-shaped guide rail group 6. At the same time, the guide plate assists in transmitting the load during loading. It has a large bearing capacity, small gap, and is easy to disassemble, which can ensure the accuracy of the contour lines of the cylinder head 42.

[0074] According to some embodiments of the present invention, the left and right pressure heads 42 can move individually or simultaneously; the type mold is symmetrically mounted on the left and right pressure heads 42 with quick-release locking clamps, and a support plate 31 is provided below the type mold 3 to prevent the lower part from deforming and the accuracy from deteriorating when the mold is loaded.

[0075] A bushing roundness correction device provided by the present invention, such as Figure 1 As shown, the movable end of the first hydraulic cylinder 41 is ball-jointed with the pressure head 42.

[0076] In this embodiment, a ball joint is used, which is simple in structure and easy to install.

[0077] According to some embodiments of the present invention, the movable end of the first hydraulic cylinder 41 is ball-jointed with the pressure head 42, which can limit the precision control point only to the guide rail 6, while the machining precision requirements such as the coaxiality of the mounting holes of the first hydraulic cylinder 41 on the left and right sides of the bed 1 can be appropriately relaxed. A bushing roundness correction device provided by the present invention, such as Figure 1 and Figure 6 As shown, the bushing roundness correction device also includes a suspended operating table 7, which is hung on the outside of the bed 1 for easy operation.

[0078] A bushing roundness correction device provided by the present invention, such as Figure 1 and Figure 2 As shown, the bushing roundness correction device also includes anchor bolts 8, which are fixed to the lower part of the bed 1 to fix the hydraulic press to the foundation.

[0079] The technical solution of the present invention will be further explained below with reference to a specific embodiment. It should be noted that the specific embodiment is only for the purpose of enabling those skilled in the art to better understand the technical solution of the present invention, and should not be regarded as an unreasonable limitation on the scope of protection of the present invention.

[0080] Example 1 The left first hydraulic cylinder pushes the left pressure head and type mold to the pressurizing position, and the right first hydraulic cylinder pushes the right pressure head and type mold to the pressurizing position. The lifting component in the mandrel mechanism is raised to load the material. After loading, the lifting component is lowered. At this time, the left and right first hydraulic cylinders simultaneously apply pressure to correct the bushing product. The mandrel mold is centered and pressure is maintained for a set time. Then, the pressure is released, the two first hydraulic cylinders retract simultaneously, the lifting component is raised, the pushing component moves forward to pick up the material, and one work cycle is completed.

[0081] The bushing roundness correction device of this invention has the following technical advantages compared with the prior art: 1. This invention features a simple structure, reasonable processing, convenient installation, and high molding precision. It can achieve roundness correction pressing molding for diverse bushing products. Furthermore, the hydraulic press must be flexible; by changing different mandrels and mold types, the roundness correction requirements for various bushing products can be met.

[0082] 2. When the hydraulic press is working, the upper horizontal tie rod is first pre-tightened using a special pre-tightening tool. This can effectively reduce the impact of the U-shaped bed's "opening" tendency on the product's correction accuracy during loading, reduce deformation, increase strength, and increase the overall stability of the equipment. This is the advantage of this machine body structure.

[0083] 3. Since the roundness of the bushing product after calibration needs to be controlled within 0.3mm, the pressure heads on both sides of the equipment must be of equal height and consistent. To meet the above requirements, the connection between the first hydraulic cylinders symmetrically placed on the left and right sides and the left and right horizontal pressure heads is designed as a ball joint. In this way, the accuracy control point can be limited to the bed guide rail, while the machining accuracy requirements such as the coaxiality of the mounting holes of the first hydraulic cylinders on the left and right sides of the bed can be appropriately relaxed.

[0084] 4. The mandrel mechanism is located at the center of the bed. The mandrel mold center is specially designed to have a high degree of freedom. When the first hydraulic cylinder loads and corrects synchronously, the mandrel mold can follow and center, which can make the bushing product thicken evenly during the correction process.

[0085] 5. The mandrel mechanism is horizontally installed and not fixedly connected to the mandrel mold. When loaded, the mandrel mold is in a floating state and adaptively finds its center, which reduces the positional accuracy requirements for the installation of the mandrel mold.

[0086] 6. The floating mandrel mold has a non-fixed fit connection, and it can adaptively find the center during correction. The bushing wall thickness increases and becomes more uniform in the circumference after correction, which meets the requirement of small thickness difference of bushing in composite coating design.

[0087] 7. Unlike a fixed mandrel, even if the left and right horizontal loading heads of the calibrating press are not synchronized, the mandrel and the equipment installation connection will not be stressed. The mandrel mold material can be a material with relatively low mechanical properties, which saves equipment costs and makes it safer to use.

[0088] 8. The mandrel device can move up and down actively, which facilitates lifting and leaving space for material before pressing. After pressing, it is lifted up at the same time as the press head retracts, making it easy to pick up the material.

[0089] 9. The mandrel assembly features front and rear pusher functions for easy material handling. After pressing, the left and right pressure heads only need to open a small distance, sufficient for the pusher rod to pass through, eliminating the need for long opening and closing distances and saving time per cycle. Furthermore, the pusher rod spacing is adjustable to accommodate all product categories.

[0090] 10. The mandrel device integrates and nests a mold changing component within a limited structural space to meet the automatic mold changing requirements of the bushing correction device.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bushing roundness correction device, characterized in that, include: Bed, spindle mechanism, type mold and horizontal power mechanism; The mandrel mechanism includes a base, a mandrel mold, a screw, and a lifting assembly. The base is fixedly connected to the bed, the lifting assembly is fixedly disposed on the upper end of the base, one end of the screw is fixedly connected to the lifting assembly and extends in the horizontal direction, the mandrel mold is sleeved on the other end of the screw, and there is a gap between the mandrel mold and the screw. The horizontal power mechanism includes two first hydraulic cylinders and a pressure head disposed at the movable end of the first hydraulic cylinder. The front end of the pressure head is detachably provided with the mold of the aforementioned type. The first hydraulic cylinders are symmetrically disposed on both sides of the base, and the movement direction of the movable end of the first hydraulic cylinder is perpendicular to the extension direction of the screw.

2. The bushing roundness correction device according to claim 1, characterized in that, The lifting assembly includes a second hydraulic cylinder, a first guide rod, a limiting plate, and a movable horizontal plate. The bottom end of the second hydraulic cylinder is fixedly connected to the base, and the movable end of the second hydraulic cylinder is fixedly connected to the movable horizontal plate. The first guide rod passes through the movable horizontal plate, and one end of the first guide rod is fixedly connected to the base, while the other end of the first guide rod is fixedly connected to the limiting plate.

3. The bushing roundness correction device according to claim 2, characterized in that, The mandrel mechanism also includes a pushing assembly, which includes a third hydraulic cylinder, a second guide rod, a connecting plate, and a pushing rod. The fixed end of the third hydraulic cylinder is fixedly connected to the movable horizontal plate, and the movable end of the third hydraulic cylinder and the second guide rod both pass through the movable horizontal plate and are fixedly connected to the rear side of the connecting plate. The connecting plate is sleeved on the screw, and the moving direction of the connecting plate is consistent with the extending direction of the screw. A push rod is provided on the front side of the connecting plate, and the extending direction of the push rod is parallel to the extending direction of the screw.

4. The bushing roundness correction device according to claim 2, characterized in that, The lifting assembly also includes a limiting rod, one end of which is fixedly connected to the base.

5. The bushing roundness correction device according to claim 3, characterized in that, The front side of the connecting plate is provided with a T-shaped groove, and the push rod is slidably disposed in the T-shaped groove.

6. The bushing roundness correction device according to claim 1, characterized in that, The mandrel mechanism further includes a first limiting block and a second limiting block, both of which are sleeved on the other end of the screw. The first limiting block is located at the front end of the mandrel mold, and the second limiting block is located at the rear end of the mandrel mold.

7. The bushing roundness correction device according to claim 1, characterized in that, The mandrel mechanism also includes a mold changing assembly, which includes two fourth hydraulic cylinders. The fourth hydraulic cylinders are symmetrically arranged on both sides of the lifting assembly. The movable end of the fourth hydraulic cylinder is fixedly connected to the base, and the fixed end of the fourth hydraulic cylinder is fixedly connected to the bed.

8. The bushing roundness correction device according to claim 1, characterized in that, It also includes a pull rod, which is located on the upper part of the bed and is used to pre-tighten both sides of the bed.

9. The bushing roundness correction device according to claim 1, characterized in that, It also includes guide rails, which are disposed on both sides of the lifting assembly and are fixedly connected to the bed, and the pressure head slides along the guide rails.

10. The bushing roundness correction device according to claim 1, characterized in that, The movable end of the first hydraulic cylinder is connected to the pressure head via a ball joint.

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