A stainless steel part concentric correction tool and a correction method

Abstract

The present application relates to the technical field of part correction, and particularly relates to a stainless steel part concentric correction tool and a correction method. The stainless steel part concentric correction tool provided by the present application comprises an upper die and a lower die arranged oppositely, a cavity for accommodating a stainless steel part is enclosed between the upper die and the lower die, an upper correction part is arranged on the side of the upper die facing the cavity, a lower correction part is arranged on the side of the lower die facing the cavity, the upper correction part and the lower correction part enclose a circular hole for exerting a radial correction force on the outer circle of the stainless steel part. The stainless steel part concentric correction tool provided by the present application exerts a uniform radial correction force on the outer circular surface of the stainless steel part from the circumference through the circular hole enclosed by the upper correction part and the lower correction part when the mold is closed, and the radial deviation in each direction can be corrected synchronously in one time of mold closing, and the correction result is stable and the batch consistency is good.

Description

Technical Field

[0001] This invention relates to the technical field of parts straightening, and in particular to a concentric straightening tool and method for stainless steel parts. Background Technology

[0002] Stainless steel components are widely used in the machinery manufacturing industry due to their corrosion resistance and mechanical properties, especially stainless steel pipe fittings, which are often used as hydraulic, pneumatic, or structural transmission components. Some stainless steel pipe fittings require forming processes such as bulging during processing. After forming, local deformation may occur on the outer surface of the fitting, causing the outer axis to deviate from the inner hole axis, resulting in a concentricity deviation between the outer surface and the inner hole. When fittings with excessive concentricity deviation are assembled, their end seals or mating surfaces cannot accurately align with corresponding components, affecting assembly accuracy and performance. Therefore, concentricity deviations usually need to be corrected before assembly.

[0003] There are two main types of existing correction methods: The first is manual hammering, where the operator visually judges the location of the deformation and applies a localized corrective force to the outer surface by hammering. The hammering contact area is small, and each application of force only acts on a localized point on the outer surface, resulting in uneven corrective force across different directions. Furthermore, the direction, magnitude, and number of applications all depend on the operator's experience, leading to poor consistency in correction results between different operators and between different batches, making it difficult to consistently achieve the required concentricity. The second method uses a unidirectional press, applying pressure to the outer surface in a single direction. While this compresses the deformation in that direction, it cannot simultaneously correct deviations in other circumferential directions. For workpieces with unevenly distributed circumferential deviations, multiple adjustments to the workpiece orientation and separate applications of pressure are often required, making the operation cumbersome. Moreover, the positioning of the workpiece is difficult to maintain consistently after each adjustment, limiting the correction accuracy.

[0004] The common problem with the two methods mentioned above is that the corrective force cannot be applied to the outer circular surface simultaneously from multiple circumferential directions, the uniformity of the corrective force distribution is insufficient, and the stability and consistency of the correction results are difficult to meet the correction requirements for concentricity in mass production. Summary of the Invention

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a concentric straightening tool and method for stainless steel parts. The concentric straightening tool for stainless steel parts provided by this invention applies a uniform radial straightening force to the outer surface of the stainless steel part from the circumference during mold closing through a circular hole formed by the upper and lower straightening parts. The radial deviations in all directions can be corrected simultaneously in one mold closing, and the straightening results are stable and have good batch consistency.

[0006] (II) Technical Solution To achieve the above objectives, this application provides a concentric straightening tool for stainless steel parts, including an upper die and a lower die arranged opposite to each other, forming a cavity for accommodating the stainless steel part. An upper straightening part is provided on the side of the upper die facing the cavity, and a lower straightening part is provided on the side of the lower die facing the cavity. The upper straightening part and the lower straightening part form a circular hole for applying radial straightening force to the outer circle of the stainless steel part.

[0007] In one possible implementation, the upper correction part includes a first upper arcuate surface and a second upper arcuate surface located at both ends of the cavity along the axial direction; the lower correction part includes a first lower arcuate surface and a second lower arcuate surface located at both ends of the cavity along the axial direction, the first upper arcuate surface and the first lower arcuate surface engaging vertically, and the second upper arcuate surface and the second lower arcuate surface engaging vertically.

[0008] In one possible implementation, the first upper arcuate surface and the first lower arcuate surface form a first circular hole, and the second upper arcuate surface and the second lower arcuate surface form a second circular hole, with the first circular hole and the second circular hole being coaxially arranged.

[0009] In one possible implementation, the stainless steel component includes a tubular body and a peripheral structure disposed on the outer surface of the tubular body, with a clearance groove provided in the cavity for avoiding the peripheral structure.

[0010] In one possible implementation, a first positioning part is provided on the side of the lower mold facing the cavity. The first positioning part fits into the outer structure and is used to position the stainless steel part in the circumferential direction.

[0011] In one possible implementation, the peripheral structure includes a protruding edge extending axially along the tubular body, and the first positioning part is a positioning boss disposed on the lower mold. The side of the positioning boss abuts against the circumferential side of the protruding edge for circumferential positioning of the stainless steel part.

[0012] In one possible implementation, a second positioning part is provided on the side of the lower mold facing the cavity. The second positioning part abuts against the axial end face of the peripheral structure and is used to position the stainless steel part along the axial direction.

[0013] In one possible implementation, a toggle mechanism is also included, which is located on the side of the lower mold facing the cavity. The toggle mechanism has a drive end for toggle the stainless steel part to rotate by a preset angle.

[0014] In one possible implementation, the upper straightening part is provided with an arc-shaped slide groove, and an arc-shaped pressure plate is slidably disposed in the arc-shaped slide groove. The surface of the arc-shaped pressure plate facing the stainless steel part is coplanar with the working surface of the upper straightening part facing the cavity. An elastic element is provided between the arc-shaped pressure plate and the arc-shaped slide groove. The elastic element applies an elastic force to the arc-shaped pressure plate in the direction of the outer structure, so that the arc-shaped pressure plate is pressed against the outer structure when the upper mold is pressed down, and the outer structure is allowed to push the arc-shaped pressure plate to slide along the arc-shaped slide groove during the rotation of the stainless steel part, so as to avoid the outer structure on the rotation path.

[0015] Secondly, the present invention provides a correction method using the above-mentioned stainless steel part concentric correction tool, comprising the following steps: positioning the stainless steel part in the lower mold; driving the upper mold to move toward the lower mold, and applying a radial correction force to the outer circular surface of the stainless steel part through the cooperation of the upper correction part and the lower correction part to correct the concentricity deviation between the outer circular surface of the stainless steel part and the inner hole; after correction is completed, separating the upper mold and the lower mold, and taking out the stainless steel part.

[0016] In one possible implementation, after the upper die is pressed down for the first time, the upper die is raised by a preset distance to maintain a clearance fit between the upper die and the stainless steel part; the actuating mechanism is driven to rotate the stainless steel part by a preset angle. During the rotation, the outer structure of the stainless steel part contacts the arc-shaped pressure plate and pushes the arc-shaped pressure plate to slide along the arc-shaped groove to avoid the outer structure on the rotation path and prevent the outer structure from interfering with the upper die; after the rotation is completed, the upper die is driven to move toward the lower die again to apply a radial correction force to the outer surface of the rotated stainless steel part.

[0017] (III) Beneficial Effects Compared with the prior art, the present invention provides a concentric straightening tool and method for stainless steel parts, which has the following beneficial effects: The stainless steel concentric straightening tool provided by this invention uses an upper and lower die arranged opposite each other to form a cavity, in which the stainless steel part is placed in a restricted positioning state. The upper and lower straightening parts are located on the sides of the upper and lower dies facing the cavity, respectively, and together they form a circular hole. When the forming machine drives the upper and lower dies to close, the circular hole simultaneously applies a radial straightening force to the outer surface of the stainless steel part from the circumferential direction. Each circumferential position on the outer surface is constrained by the wall of the circular hole, and locally protruding parts are pressed back synchronously during the die closing process. The geometric axis of the outer surface facing the circular hole converges, thereby correcting the concentricity deviation between the outer surface and the inner hole. Compared with the situation where the straightening force only acts on local points on the outer surface when manually hammering, and the situation where a unidirectional press can only correct deviations in a single direction and requires multiple adjustments of the workpiece direction to apply pressure separately, the circumferential full-coverage constraint of the circular hole on the outer surface can simultaneously correct radial deviations in all directions in one die closing, ensuring the stability and batch consistency of the straightening results. Attached Figure Description

[0018] Figure 1 This illustration shows an exploded structural diagram of a stainless steel concentric straightening tool and a stainless steel part according to an embodiment of this application. Figure 2 This illustration shows a three-dimensional structural diagram of a stainless steel concentric straightening tool provided in an embodiment of this application; Figure 3 This diagram illustrates a three-dimensional structure of an upper mold according to an embodiment of this application. Figure 4 This illustration shows a three-dimensional structural diagram of a lower mold provided in an embodiment of this application; Figure 5 This illustration shows a cross-sectional structural diagram of a stainless steel concentric straightening tool provided in an embodiment of this application; Figure 6 This diagram illustrates a three-dimensional structure of a stainless steel component provided in an embodiment of this application.

[0019] Marked in the attached diagram: a. Stainless steel components; a1. Tubular main body; a2. External structure; 1. Upper mold; 11. Upper straightening part; 111. First upper arc surface; 112. Second upper arc surface; 113. Arc-shaped slide groove; 114. Arc-shaped pressure plate; 115. Elastic element; 2. Lower mold; 21. Lower straightening part; 211. First lower arc surface; 212. Second lower arc surface; 22. First positioning part; 23. Second positioning part; 3. Cavity; 4. Clearance groove; 5. Actuating mechanism. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1 to 6 This application provides a concentric straightening tool for a stainless steel part a, including an upper mold 1 and a lower mold 2 arranged opposite to each other. The upper mold 1 and the lower mold 2 form a cavity 3 for accommodating the stainless steel part a. An upper straightening part 11 is provided on the side of the upper mold 1 facing the cavity 3, and a lower straightening part 21 is provided on the side of the lower mold 2 facing the cavity 3. The upper straightening part 11 and the lower straightening part 21 form a circular hole for applying radial straightening force to the outer circle of the stainless steel part a.

[0022] In this invention, the upper mold 1 and the lower mold 2 are arranged opposite to each other and form a cavity 3. The stainless steel part a is placed in the cavity 3 and is in a restricted positioning state. The upper straightening part 11 and the lower straightening part 21 are located on the side of the upper mold 1 and the lower mold 2 facing the cavity 3, respectively, and together they form a circular hole. When the forming machine drives the upper mold 1 and the lower mold 2 to close, the circular hole simultaneously applies a radial straightening force to the outer circular surface of the stainless steel part a from the circumferential direction. Each circumferential position on the outer circular surface is constrained by the wall of the circular hole. Local protruding parts are synchronously pressed back during the mold closing process, and the geometric axis of the outer circular surface facing the circular hole converges, thereby realizing the correction of the concentricity deviation between the outer circular surface and the inner hole. Compared to manual tapping where the corrective force only acts on local points on the outer surface, and unidirectional presses which can only correct deviations in one direction and require multiple adjustments to the workpiece orientation for separate pressure application, the circumferential full-coverage constraint of the circular hole on the outer surface can simultaneously correct radial deviations in all directions in a single mold closing operation, ensuring the stability of the correction results and batch consistency.

[0023] Specifically, the upper straightening part 11 and the lower straightening part 21 are each arc-shaped structures, respectively located on the side of the upper mold 1 and the lower mold 2 facing the cavity 3. During mold closing, the two parts align to form a complete circular hole, the inner diameter of which matches the target dimension of the outer circular surface of the stainless steel part a. During mold closing, the inner wall of the circular hole uniformly presses against the outer circular surface radially, constraining the outer circular surface to the cylindrical surface defined by the circular hole. Because the radial straightening force acts simultaneously from multiple circumferential directions, the force on the outer circular surface is relatively uniform in all directions, and there is no problem of localized excessive deformation caused by single-point force.

[0024] In a specific embodiment, for a stainless steel pipe fitting with a local bulge on the outer circular surface and an outer circular axis deviating from the inner hole axis due to the bulging process, after placing it into the cavity 3 and closing the mold, the circular hole applies radial extrusion force to the outer circular surface from the circumference, forcing the bulging area to shrink inward, the outer circular surface as a whole approaches the cylindrical surface defined by the circular hole, and the outer circular axis approaches the central axis of the circular hole, thus correcting the concentricity deviation between the outer circular surface and the inner hole.

[0025] In related technologies, the correction of concentricity deviations in stainless steel parts often relies on manual hammering or unidirectional presses. Manual hammering makes it difficult to precisely control the position and force applied, resulting in poor consistency in correction results between different operators. Furthermore, the small contact area of ​​the hammer can easily leave localized pits on the outer surface. While unidirectional presses provide more stable force, they can only apply pressure in one direction, limiting their effectiveness in correcting deviations in other directions, and require multiple directional changes.

[0026] In this embodiment of the invention, the upper straightening part 11 and the lower straightening part 21 form a circular hole. When the mold is closed, the radial straightening force acts on the outer circular surface from the circumference at the same time. The distribution of the straightening force is more uniform, and the straightening result does not depend on the operator's technique. The consistency of the workpiece is easier to ensure when straightening in batches.

[0027] In some embodiments, the upper correction part 11 includes a first upper arcuate surface 111 and a second upper arcuate surface 112 located at both ends of the cavity 3 along the axial direction; the lower correction part 21 includes a first lower arcuate surface 211 and a second lower arcuate surface 212 located at both ends of the cavity 3 along the axial direction, the first upper arcuate surface 111 and the first lower arcuate surface 211 are in vertical cooperation, and the second upper arcuate surface 112 and the second lower arcuate surface 212 are in vertical cooperation.

[0028] In this invention, the upper correction part 11 is provided with a first upper arc-shaped surface 111 and a second upper arc-shaped surface 112 at both ends of the cavity 3 in the axial direction, and the lower correction part 21 is provided with a first lower arc-shaped surface 211 and a second lower arc-shaped surface 212 respectively. When the mold is closed, a set of correction sections are formed at both ends of the stainless steel part a in the axial direction, so that the radial correction force is distributed at two positions along the axial direction, which expands the axial coverage of the correction force and is beneficial to simultaneously correct the deviation of the outer circular surface of the stainless steel part a at different positions in the axial direction.

[0029] Specifically, the mating of the first upper arc-shaped surface 111 and the first lower arc-shaped surface 211 means that when the mold is closed, the first upper arc-shaped surface 111 and the first lower arc-shaped surface 211 align together, forming an arc-shaped constraint area on the outer circular surface of the stainless steel part a at one axial end; similarly, the second upper arc-shaped surface 112 and the second lower arc-shaped surface 212 form a corresponding arc-shaped constraint area at the other axial end. The two sets of arc-shaped surfaces independently constrain the outer circular surfaces at the beginning and end of the axial direction of the stainless steel part a, respectively, and the two sets of straightening sections apply force synchronously when the mold is closed.

[0030] In the embodiment of the invention, the correction sections at both ends of the axial direction simultaneously constrain the outer circular surfaces of the two axial ends of the stainless steel part a during a single mold closing process. The deviation at both ends can be corrected in the same process, reducing the number of processes and the error introduced by multiple clamping.

[0031] In some embodiments, the first upper arcuate surface 111 and the first lower arcuate surface 211 form a first circular hole, and the second upper arcuate surface 112 and the second lower arcuate surface 212 form a second circular hole, with the first circular hole and the second circular hole being coaxially arranged.

[0032] In this invention, the first upper arc surface 111 and the first lower arc surface 211 form a first circular hole, and the second upper arc surface 112 and the second lower arc surface 212 form a second circular hole. The first circular hole and the second circular hole are coaxially arranged so that the radial correction force on both ends of the stainless steel part a points to the same axis, ensuring that the outer circle axis after correction is consistent with the central axis determined by the two holes, and avoiding the introduction of additional shape error during the correction process due to the non-coincidence of the correction hole axes at both ends.

[0033] Specifically, the coaxiality of the first and second circular holes means that their central axes completely coincide. During mold closing, the outer circular surfaces at both ends of the stainless steel part a are constrained to the same axial position by the first and second circular holes, respectively. The overall axis of the outer circular surfaces approaches the common axis of the two holes, and the correction direction is consistent. The coaxial accuracy of the two holes is usually ensured by the precision machining of the upper and lower molds 2 and the mold closing guide structure.

[0034] In some embodiments, the stainless steel component a includes a tubular body a1 and a peripheral structure a2 disposed on the outer surface of the tubular body a1, and a clearance groove 4 for avoiding the peripheral structure a2 is provided in the cavity 3.

[0035] In this invention, for a stainless steel part a including a tubular body a1 and a peripheral structure a2 disposed on the outer surface of the tubular body a1, a clearance groove 4 is provided in the cavity 3 to avoid the peripheral structure a2, so that the peripheral structure a2 falls into the clearance groove 4 when the mold is closed, and the upper correction part 11 and the lower correction part 21 can directly contact the outer circular surface of the tubular body a1, ensuring that the radial correction force is accurately applied to the outer circular surface, while avoiding the peripheral structure a2 being directly squeezed by the mold during the mold closing process.

[0036] Specifically, the outer structure a2 refers to the structure fixed to the outer circular surface of the tubular body a1 and higher than the outer circular surface in the radial direction, such as a weld protrusion, mounting boss, or pipe joint. The position and shape of the clearance groove 4 correspond to the outer structure a2, providing sufficient space for the outer structure a2 so that the outer structure a2 does not contact the inner wall of the mold when the mold is closed. The arc-shaped working surfaces of the upper straightening part 11 and the lower straightening part 21 can thus directly fit against the outer circular surface of the tubular body a1, and the radial straightening force can be effectively transmitted.

[0037] In one specific embodiment, a number of mounting bosses are welded to the outer surface of the stainless steel pipe fitting, and the bosses protrude a certain height from the outer circular surface in the radial direction. After setting the corresponding shaped relief groove 4, the bosses enter the relief groove 4 when the mold is closed, the arc-shaped working surface of the straightening part fully fits the outer circular surface, the radial straightening force is effectively transmitted, the concentricity between the outer circular surface and the inner hole is corrected, and the mounting bosses are not directly affected by the straightening force.

[0038] In some embodiments, a first positioning part 22 is provided on the side of the lower mold 2 facing the cavity 3. The first positioning part 22 is fitted with the peripheral structure a2 and is used to position the stainless steel part a in the circumferential direction.

[0039] In this invention, a first positioning part 22 is provided on the side of the lower mold 2 facing the cavity 3. The first positioning part 22 is in contact with the outer structure a2. The outer structure a2 is used to circumferentially position the stainless steel part a, so that the stainless steel part a is kept at a preset circumferential angle position after being placed in the lower mold 2, ensuring that the corrective force is applied to the expected area on the outer surface each time.

[0040] Specifically, the engagement between the first positioning part 22 and the peripheral structure a2 means that the positioning working surface of the first positioning part 22 and the circumferential side surface of the peripheral structure a2 come into contact and abut against each other, preventing the stainless steel part a from rotating circumferentially within the cavity 3 through contact force. The peripheral structure a2 is fixed to the outer surface of the tubular body a1, and its circumferential position relative to the tubular body a1 is fixed. Using the peripheral structure a2 as a circumferential positioning reference, a specific area on the tubular body a1 can be accurately aligned with the correction position of the correction part.

[0041] In some embodiments, the peripheral structure a2 includes a protruding edge extending axially along the tubular body a1, and the first positioning part 22 is a positioning boss disposed on the lower mold 2. The side of the positioning boss abuts against the circumferential side of the protruding edge, and is used to position the stainless steel part a circumferentially.

[0042] In this invention, the peripheral structure a2 includes a protruding edge extending axially along the tubular body a1, and the first positioning part 22 is a positioning boss provided on the lower mold 2. The side of the positioning boss abuts against the circumferential side of the protruding edge, and the circumferential positioning of the stainless steel part a is achieved by the direct stop of the side of the positioning boss against the circumferential side of the protruding edge.

[0043] Specifically, the convex edge is a protruding structure extending axially along the tubular body a1, with its circumferential side parallel to the axis of the tubular body a1, and has a clearly defined circumferential positioning reference surface. The positioning boss is located on the side of the lower mold 2 facing the cavity 3, and its side directly contacts and abuts against the circumferential side of the convex edge, forming a stop in the circumferential direction for the stainless steel part a, preventing it from rotating circumferentially. The positioning boss can be integrally machined with the lower mold 2, resulting in a simple structure and convenient machining and assembly.

[0044] In one specific embodiment, a reinforcing rib (i.e., a raised edge) is welded along the axial direction on the outer surface of the stainless steel pipe fitting, and the circumferential side of the reinforcing rib serves as the circumferential positioning reference surface. When the stainless steel part a is placed into the lower mold 2, the circumferential side of the reinforcing rib contacts the side of the positioning boss, and the stainless steel part a is automatically positioned to the designed angle. The placement operation is intuitive and quick, and the operator does not need to use additional tools to assist in alignment.

[0045] In some embodiments, a second positioning part 23 is provided on the side of the lower mold 2 facing the cavity 3. The second positioning part 23 abuts against the axial end face of the peripheral structure a2 and is used to position the stainless steel part a along the axial direction.

[0046] In this invention, a second positioning part 23 is provided on the side of the lower mold 2 facing the cavity 3. The second positioning part 23 abuts against the axial end face of the peripheral structure a2 to axially position the stainless steel part a, so that the stainless steel part a is kept in the preset axial position after being placed in the lower mold 2, ensuring that the correction section and the target area on the outer circle surface of the stainless steel part a are accurately corresponding in the axial direction.

[0047] Specifically, the positioning working surface of the second positioning part 23 contacts the axial end face of the peripheral structure a2. The contact force prevents the stainless steel part a from axially moving towards the second positioning part 23, thus fixing the axial position of the stainless steel part a at a preset position. Combined with the circumferential constraint of the first positioning part 22, the stainless steel part a achieves bidirectional positioning in both the circumferential and axial directions within the cavity 3. The workpiece clamping state is clear and stable, retaining only the axial degree of freedom for insertion and removal, facilitating operation. The axial end face of the peripheral structure a2 directly serves as the axial positioning reference, fully utilizing the existing structural features of the workpiece itself, eliminating the need for additional positioning elements on the workpiece.

[0048] In some embodiments, a toggle mechanism 5 is also included. The toggle mechanism 5 is disposed on the side of the lower mold 2 facing the cavity 3. The toggle mechanism 5 has a drive end, which is used to toggle the stainless steel part a to rotate by a preset angle.

[0049] In this invention, the actuating mechanism 5 is located on the side of the lower mold 2 facing the cavity 3. The driving end of the actuating mechanism 5 can directly actuate the stainless steel part a to rotate within the cavity 3 by a preset angle without removing the stainless steel part a, so that the workpiece can be moved to a new angle position after completing one correction, so as to perform multiple targeted corrections on the deviations of the outer circular surface in different directions.

[0050] Specifically, the driving end is the active component in the actuating mechanism 5 that directly contacts the stainless steel part a. The driving end applies a thrust in the circumferential direction by contacting a structure on the stainless steel part a (such as the side of the outer structure a2), causing the stainless steel part a to rotate around its axis. The preset angle is a rotation angle predetermined based on the workpiece deformation distribution or process requirements, and can be adjusted according to actual working conditions. The specific form of the actuating mechanism 5 is not limited; it can be implemented with a cylinder-driven push rod or a servo motor-driven pawl, and can be selected according to the required level of automation.

[0051] In one specific embodiment, the concentricity deviation of the outer surface of the stainless steel pipe fitting is unevenly distributed along the circumference, and the deviation is relatively concentrated within a specific angular range in the circumference. After the first correction is completed, the workpiece is rotated by a certain angle through the actuating mechanism 5, so that the area with more concentrated deviation is turned to the direction of stronger correction force, and the mold is closed again for correction. After the two corrections are superimposed, the deviation coverage in all directions of the outer surface is wider, and the correction effect is more comprehensive than a single fixed angle correction.

[0052] In this embodiment of the invention, the actuating mechanism 5 is integrated into the lower mold 2. The drive end completes the rotation and repositioning when the workpiece is not removed, eliminating the need for workpiece removal and placement. The rotation angle is controlled by the stroke of the actuating mechanism 5. The angle repeatability accuracy is easier to guarantee compared to manual repositioning, which is beneficial to the stable execution of the multi-angle correction process.

[0053] In some embodiments, the upper straightening part 11 is provided with an arc-shaped groove 113, and an arc-shaped pressure plate 114 is slidably disposed in the arc-shaped groove 113. The surface of the arc-shaped pressure plate 114 facing the stainless steel part a is coplanar with the working surface of the upper straightening part 11 facing the cavity 3. An elastic member 115 is provided between the arc-shaped pressure plate 114 and the arc-shaped groove 113. The elastic member 115 applies an elastic force to the arc-shaped pressure plate 114 in the direction of the peripheral structure a2, so that the arc-shaped pressure plate 114 is pressed against the peripheral structure a2 when the upper mold 1 is pressed down, and the peripheral structure a2 is allowed to push the arc-shaped pressure plate 114 to slide along the arc-shaped groove 113 during the rotation of the stainless steel part a, so as to avoid the peripheral structure a2 on the rotation path.

[0054] In this invention, the upper straightening part 11 is provided with an arc-shaped slide groove 113, and an arc-shaped pressure plate 114 is slidably disposed in the arc-shaped slide groove 113. The surface of the arc-shaped pressure plate 114 facing the stainless steel part a is coplanar with the working surface of the upper straightening part 11 facing the cavity 3. An elastic element 115 is provided between the arc-shaped pressure plate 114 and the arc-shaped slide groove 113, and the elastic element 115 applies an elastic force to the arc-shaped pressure plate 114 in the direction of the outer structure a2. When the upper mold 1 is pressed down, the arc-shaped pressure plate 114 actively presses against the outer structure a2 under the action of the elastic force. In the working state, the working surface of the arc-shaped pressure plate 114 is coplanar with the working surface of the upper straightening part 11, and does not affect the constraint of the working surface of the straightening part on the outer circular surface. When the workpiece is rotated and repositioned, the outer structure a2 pushes the arc-shaped pressure plate 114 to slide along the arc-shaped slide groove 113. The arc-shaped pressure plate 114 avoids the outer structure a2 on the rotation path, so that the workpiece can be rotated and repositioned before the upper mold 1 is completely disengaged.

[0055] Specifically, the trajectory of the arc-shaped slide groove 113 is arc-shaped, and its direction corresponds to the arc-shaped path of the outer structure a2 when the stainless steel part a rotates. This ensures that the sliding direction of the arc-shaped pressure plate 114 is consistent with the direction of movement of the outer structure a2 during rotation, thereby reducing the resistance to movement when the outer structure a2 pushes the arc-shaped pressure plate 114 and ensuring the smoothness of the rotation. The elastic element 115 can be in various forms such as a spring or an elastic rubber block, as long as it can continuously apply an elastic force towards the outer structure a2 to the arc-shaped pressure plate 114. After rotation, the elastic element 115 pushes the arc-shaped pressure plate 114 back to its original position along the arc-shaped slide groove 113, waiting to be pressed against the outer structure a2 again during the next mold closing.

[0056] In one specific embodiment, the outer surface of the stainless steel pipe fitting is provided with an axial protruding edge. During mold closing and straightening, the arc-shaped pressure plate 114 presses against the top surface of the protruding edge under the action of elastic force, and the working surface of the arc-shaped pressure plate 114 is coplanar with the working surface of the upper straightening part 11. The constraint of the straightening part on the outer circular surface does not produce local gaps due to the presence of the arc-shaped pressure plate 114. During rotation and repositioning, the upper mold 1 is raised to a position that maintains a clearance fit with the outer circular surface. The protruding edge rotates with the workpiece and pushes the arc-shaped pressure plate 114 to retract along the arc-shaped slide groove 113. The protruding edge smoothly passes through the rotation path. After the rotation is completed, the elastic element 115 pushes the arc-shaped pressure plate 114 to reset.

[0057] This invention provides a correction method using the aforementioned stainless steel part a concentric correction tool, comprising the following steps: S1. Position the stainless steel part a in the lower mold 2; S2. Drive the upper mold 1 to move toward the lower mold 2. Through the cooperation of the upper correction part 11 and the lower correction part 21, apply radial correction force to the outer circular surface of the stainless steel part a to correct the concentricity deviation between the outer circular surface of the stainless steel part a and the inner hole. S3. After the correction is completed, separate the upper mold 1 and the lower mold 2, and take out the stainless steel part a.

[0058] In this invention, after the stainless steel part a is positioned in the lower mold 2, the upper mold 1 is driven to move towards the lower mold 2. Through the cooperation of the upper straightening part 11 and the lower straightening part 21, a radial straightening force is applied to the outer circular surface of the stainless steel part a, forcing the outer circular surface to approach the cylindrical surface defined by the circular hole, thereby correcting the concentricity deviation between the outer circular surface and the inner hole. After the straightening is completed, the upper mold 1 and the lower mold 2 are separated, and the stainless steel part a is removed. This method defines the straightening process at the operational step level, complementing the device claims and further improving the protection of the overall straightening scheme.

[0059] Specifically, driving the upper mold 1 towards the lower mold 2 means applying pressure to the upper mold 1 using a hydraulic press, pneumatic press, or other pressure equipment, causing the upper mold 1 to move towards the lower mold 2, thus completing the mold closing action. During the mold closing process, the upper straightening part 11 and the lower straightening part 21 enclose to form a circular hole, and the inner wall of the circular hole applies a radial straightening force to the outer surface of the stainless steel part a. Separating the upper mold 1 and the lower mold 2 means that after the straightening is completed, the upper mold 1 is lifted or the lower mold 2 is lowered, so that the two are no longer in the mold closing state, allowing the stainless steel part a to be removed. The entire straightening process has simple and clear operating steps, making it easy for operators to perform.

[0060] In some embodiments, after the upper mold 1 is pressed down for the first time, the upper mold 1 is raised by a preset distance to maintain a clearance fit between the upper mold 1 and the stainless steel part a; the driving mechanism 5 is driven to rotate the stainless steel part a by a preset angle. During the rotation, the outer structure a2 of the stainless steel part a contacts the arc-shaped pressure plate 114 and pushes the arc-shaped pressure plate 114 to slide along the arc-shaped slide groove 113 to avoid the outer structure a2 on the rotation path and prevent the outer structure a2 from interfering with the upper mold 1; after the rotation is completed, the upper mold 1 is driven to move toward the lower mold 2 again to apply a radial correction force to the outer surface of the rotated stainless steel part a.

[0061] In this invention, after the upper mold 1 is pressed down for the first time, it is raised by a preset distance to maintain a clearance fit between the upper mold 1 and the stainless steel part a. Then, the actuating mechanism 5 is driven to rotate the stainless steel part a by a preset angle. During the rotation, the outer structure a2 of the stainless steel part a contacts the arc-shaped pressure plate 114 and pushes the arc-shaped pressure plate 114 to slide along the arc-shaped slide groove 113, thus avoiding the outer structure a2 on the rotation path. After the rotation is completed, the upper mold 1 is driven to move towards the lower mold 2 again, applying a radial correction force to the outer surface of the rotated stainless steel part a. Through in-situ rotation and repositioning between the two pressure applications, multi-angle correction is achieved without removing the workpiece, further improving the coverage of the correction force on the deviation of the outer surface in various directions.

[0062] Specifically, clearance fit means that after the upper mold 1 is lifted, a certain gap is maintained between the working surface of the upper straightening part 11 and the outer circular surface of the stainless steel part a. This gap is sufficient to allow the workpiece to rotate, but the upper mold 1 is not completely removed from the axial range where the workpiece is located. In this state, the arc-shaped pressure plate 114 remains in contact with the outer structure a2 under the elastic force of the elastic element 115, providing auxiliary constraint for the workpiece. The stability of the workpiece position during rotation is better than when the upper mold 1 is completely removed from the workpiece. The preset distance is the specific height at which the upper mold 1 is lifted. This height ensures that a sufficient rotational gap is formed between the working surface of the upper straightening part 11 and the outer circular surface, while maintaining contact between the arc-shaped pressure plate 114 and the outer structure a2. After rotation, the arc-shaped pressure plate 114 is reset along the arc-shaped slide groove 113 under the action of the elastic element 115, waiting for the second mold closing.

[0063] In one specific embodiment, for stainless steel pipe fittings with a wide deformation distribution range on the outer circular surface, the concentricity deviation has been partially eliminated after the first correction, but residual deviations are still distributed in other angular directions. After rotating the workpiece to an appropriate angle by the actuating mechanism 5, it is corrected again. The second correction force is applied to the deviation area that was not fully covered by the first correction. After the two corrections are superimposed, the concentricity deviation in all directions of the outer circular surface can be improved to a certain extent.

[0064] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0065] It should be readily understood that “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0066] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0067] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0068] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A concentric alignment tool for stainless steel parts, characterized in that, The device includes an upper mold (1) and a lower mold (2) arranged opposite to each other. The upper mold (1) and the lower mold (2) form a cavity (3) for accommodating a stainless steel part. The upper mold (1) has an upper straightening part (11) on the side facing the cavity (3), and the lower mold (2) has a lower straightening part (21) on the side facing the cavity (3). The upper straightening part (11) and the lower straightening part (21) form a circular hole for applying radial straightening force to the outer surface of the stainless steel part.

2. The stainless steel concentricity straightening tool according to claim 1, characterized in that, The upper correction part (11) includes a first upper arcuate surface (111) and a second upper arcuate surface (112) located at both ends of the cavity (3) along the axial direction. The lower correction part (21) includes a first lower arc surface (211) and a second lower arc surface (212) located at both ends of the cavity (3) along the axial direction. The first upper arc surface (111) and the first lower arc surface (211) are in vertical cooperation, and the second upper arc surface (112) and the second lower arc surface (212) are in vertical cooperation.

3. The stainless steel concentricity straightening tool according to claim 2, characterized in that, The first upper arc surface (111) and the first lower arc surface (211) form a first circular hole, and the second upper arc surface (112) and the second lower arc surface (212) form a second circular hole. The first circular hole and the second circular hole are coaxially arranged.

4. The stainless steel concentricity straightening tool according to claim 1, characterized in that, The stainless steel component includes a tubular body and a peripheral structure disposed on the outer surface of the tubular body. A clearance groove (4) for avoiding the peripheral structure is provided in the cavity (3).

5. The stainless steel concentricity straightening tool according to claim 4, characterized in that, The lower mold (2) is provided with a first positioning part (22) on the side facing the cavity (3). The first positioning part (22) fits into the peripheral structure and is used to position the stainless steel part in the circumferential direction.

6. The stainless steel concentricity straightening tool according to claim 5, characterized in that, The peripheral structure includes a protruding edge extending along the axial direction of the tubular body. The first positioning part (22) is a positioning boss provided on the lower mold (2). The side of the positioning boss abuts against the circumferential side of the protruding edge and is used to position the stainless steel part circumferentially.

7. The stainless steel concentricity straightening tool according to claim 4, characterized in that, The lower mold (2) is provided with a second positioning part (23) on the side facing the cavity (3). The second positioning part (23) abuts against the axial end face of the peripheral structure and is used to position the stainless steel part along the axial direction.

8. The stainless steel concentricity straightening tool according to claim 4, characterized in that, It also includes a toggle mechanism (5), which is disposed on the side of the lower mold (2) facing the cavity (3). The toggle mechanism (5) has a drive end, which is used to toggle the stainless steel part to rotate a preset angle.

9. The stainless steel concentricity straightening tool according to claim 8, characterized in that, The upper straightening part (11) is provided with an arc-shaped groove (113), and an arc-shaped pressure plate (114) is slidably disposed in the arc-shaped groove (113). The surface of the arc-shaped pressure plate (114) facing the stainless steel part is coplanar with the working surface of the upper straightening part (11) facing the cavity (3). An elastic element (115) is provided between the arc-shaped pressure plate (114) and the arc-shaped groove (113). The elastic element (115) applies an elastic force toward the peripheral structure to the arc-shaped pressure plate (114) so ​​that the arc-shaped pressure plate (114) is pressed against the peripheral structure when the upper mold (1) is pressed down, and the peripheral structure is allowed to push the arc-shaped pressure plate (114) to slide along the arc-shaped groove (113) during the rotation of the stainless steel part, so as to avoid the peripheral structure on the rotation path.

10. A straightening method using a concentric straightening tool for stainless steel parts as described in any one of claims 1-9, characterized in that, Includes the following steps: Position the stainless steel part in the lower mold (2); Drive the upper mold (1) to move toward the lower mold (2), and apply radial correction force to the outer surface of the stainless steel part through the cooperation of the upper correction part (11) and the lower correction part (21) to correct the concentricity deviation between the outer surface of the stainless steel part and the inner hole. After the correction is completed, separate the upper mold (1) and the lower mold (2) and take out the stainless steel part.

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