Sleeve, roller, sleeve machining method and straightening machine

Abstract

The invention provides a sleeve, a roller, a sleeve machining method and a straightening machine. A plurality of pit structures are arranged on the peripheral wall of the sleeve, a chip groove spirally extending around the axis of the sleeve is further formed, and the chip groove extends, passes through and is communicated with at least part of the pit structures. According to the sleeve, the chip grooves in the sleeve are at least partially communicated with the concave pit structures, when the metal pipe is fed, lubricating oil on the metal pipe can enter the concave pit structures to be stored, and when the contact area of the metal pipe and the sleeve is lean oil, the concave pit structures can release the lubricating oil; lubricating oil can be evenly distributed in the axial direction and the circumferential direction of the sleeve at the same time through the chip grooves, and therefore the lubricating effect between the metal pipe fitting and the sleeve is improved. Burrs and other structures on the metal pipe fitting enter the pit structures along with the rotation of the roller and are discharged from the chip grooves, so that the influence of impurities such as the burrs and the like on the surface quality of the sleeve is reduced, the service life of the roller is prolonged, and the quality of machined products is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of straightening machines, and in particular to a sleeve, a roller, a sleeve processing method and a straightening machine. Background Art

[0002] In modern manufacturing, metal pipe fittings, as an important basic material, are widely used in many fields such as construction, automobiles, aerospace, petrochemicals, etc. The production quality of metal pipe fittings directly affects the performance and safety of downstream products. Therefore, it is very important to ensure the flatness and thickness accuracy of metal pipe fittings during the production process. As a key equipment in the metal pipe fitting production line, the main function of the straightening machine is to correct the flatness and adjust the thickness of the metal pipe fittings by applying a certain force to the metal pipe fittings to achieve the required accuracy and quality standards.

[0003] In the production process of metal pipe fittings, the raw materials are usually subjected to processes such as rolling, welding or extrusion, which may cause irregular deformation, bending or uneven thickness on the surface of the pipe fittings. In order to eliminate these defects, the straightening machine applies continuous pressure to the pipe fittings through a series of rollers to restore it to the ideal shape and size. However, there may be a certain amount of burrs, metal particles or other impurities on the outer wall of the metal pipe fittings, which may detach from the surface of the pipe fittings during the straightening process and adhere to the rollers of the straightening machine.

[0004] Prior art CN213728645U discloses a six-fold parallel roller straightening machine roller system intermediate roller structure, which includes a working roller, a support roller, and an intermediate roller arranged between the working roller and the support roller, and the intermediate roller is provided with a spiral groove. Through the spiral groove provided on the intermediate roller, during the straightening process, the lubricating oil is evenly distributed along the spiral groove on the contact surface between the intermediate roller and the workpiece, thereby improving the lubrication effect and extending the service life of the roller.

[0005] However, the spiral groove has a small coverage area on the surface of the middle roller, and has a poor cleaning effect on burrs, metal particles or other impurities deposited on the roller. Over time and with the long-term use of the straightener, these impurities will gradually accumulate on the roller surface, causing wear and scratches on the roller surface. This wear not only affects the service life of the roller, but also reduces the working efficiency of the straightener and the processing quality of the product. The uneven surface of the roller will exert uneven pressure on the metal pipe during the straightening process, causing new defects on the surface of the pipe, such as scratches, dents or uneven thickness. These defects will directly affect the appearance quality and performance of the metal pipe, and may even cause product failure or safety hazards during use.

[0006] In addition, since the spiral groove covers a small area on the surface of the intermediate roller, there is an uneven oil distribution problem between the metal pipe and the roller sleeve, which will also cause excessive wear of the sleeve, thereby affecting the quality of subsequent processed workpieces. Summary of the invention

[0007] The present invention provides a sleeve, a roller, a sleeve processing method and a straightening machine. The chip groove on the sleeve is at least partially connected to the pit structure. The burrs, metal particles or other impurities on the metal pipe enter the pit structure as the roller rotates and are discharged from the chip groove, which is beneficial to reducing the influence of burrs and other impurities on the surface quality of the sleeve, so that the oil film between the metal pipe and the roller sleeve is evenly distributed, avoiding excessive wear of the sleeve, thereby extending the service life of the roller and ensuring the quality of the processed product.

[0008] On the one hand, the present invention provides a sleeve, which is used for the roller of a straightening machine. The peripheral wall of the sleeve is provided with a plurality of pit structures. The peripheral wall of the sleeve is also provided with a chip groove extending spirally around the axis of the sleeve. The chip groove extends through and connects at least part of the plurality of pit structures.

[0009] The sleeve of the present invention is provided with a pit structure and a spiral chip groove on the circumferential wall. On the one hand, during straightening, the outer wall of the metal pipe is coated with lubricating oil, and then the metal pipe is fed and straightened. The sleeve and the metal pipe are in contact through the friction pair, and the lubricating oil on the metal pipe can be stored in the pit structure. When the contact area between the metal pipe and the sleeve is oil-deficient, the pit structure can release the lubricating oil to ensure the feeding effect of the metal pipe and avoid surface wear of the metal pipe due to poor surface contact between the sleeve and the metal pipe during the straightening process. At this time, the chip groove extending spirally along the axis of the sleeve can make the lubricating oil evenly distributed along the axial and circumferential directions of the sleeve at the same time, thereby improving the lubrication effect between the metal pipe and the sleeve.

[0010] On the other hand, during the feeding process of the metal pipe, due to the contact and friction between the metal pipe and the sleeve, the burrs or metal particles on the outer wall of the metal pipe can enter the pit structure with the rotation of the roller for storage, thereby preventing the burrs or metal particles from entering the contact area between the sleeve and the metal pipe, resulting in reduced quality of the outer wall of the metal pipe or wear of the outer wall of the sleeve. Since the chip groove is connected to at least part of the pit structure, some impurities entering the pit structure can be discharged from the chip groove, which is beneficial to reduce the impact of burrs and other impurities on the surface quality of the sleeve, thereby extending the service life of the roller to ensure the quality of the processed product.

[0011] In some embodiments, the depth H1 of the pit structure satisfies, ; and / or, the opening width D1 of the pit structure satisfies, ; and / or, the depth H2 of the chip groove satisfies, ; and / or, the width D2 of the chip groove satisfies, ; and / or, the pitch P of the chip groove satisfies: ;

[0012] Wherein, d is the diameter of the sleeve, L is the length of the sleeve, m is the thickness of the sleeve, p is the first calculation coefficient, q is the second calculation coefficient, r is the third calculation coefficient, s is the fourth calculation coefficient, and t is the fifth calculation coefficient,

[0013] The first calculation coefficient p satisfies: and / or,

[0014] The second calculation coefficient q satisfies: and / or,

[0015] The third calculation coefficient r satisfies: and / or,

[0016] The fourth calculation coefficient s satisfies: and / or,

[0017] The fifth calculation coefficient t satisfies: .

[0018] In this way, by selecting the appropriate calculation coefficient, matching the structural dimensions of the corresponding sleeve according to the straightening machine model, and designing the pit structure and chip groove with appropriate structural dimensions according to the sleeve diameter d, sleeve length L and sleeve thickness m.

[0019] In some embodiments, a plurality of the dimple structures are spaced along the circumference and / or axial direction of the sleeve; the plurality of dimple structures are divided into a plurality of groups spaced along the circumference of the sleeve, and each group includes a plurality of the dimple structures spaced along the axial direction of the sleeve. When the dimple structures are spaced along the circumference, it can be ensured that when the sleeve rotates, the lubricating oil can evenly cover the entire circumferential wall surface, forming a uniform oil film, which helps to reduce friction and surface wear of the sleeve. The axially spaced dimple structures can enable the lubricating oil to be evenly distributed along the entire length of the sleeve, which is beneficial to prevent local overheating of the sleeve and reduce sleeve wear. Multiple groups of dimple structures are spaced along the circumference of the sleeve, which is beneficial to ensure that when the sleeve rotates, each group of dimple structures can alternately contact the surface of the aluminum alloy flat tube, providing continuous lubrication support for the contact area between the sleeve and the metal pipe fitting. The dimple structures in each group are spaced along the axial direction of the sleeve, so that the lubricating oil can be evenly distributed over the entire length of the sleeve, which is beneficial to ensure that there is enough lubrication area between the sleeve surface and the metal pipe fitting.

[0020] In some embodiments, the total area of ​​the pit structure overlapping with the chip groove is 35%-45% of the total area of ​​all the pit structures. On the one hand, this arrangement can avoid the overlapping area of ​​the chip groove and the pit being too small, which will not improve the uniform distribution of the lubricating oil and the effect of removing impurities is poor; on the other hand, it can avoid the overlapping area of ​​the chip groove and the pit being too large, which will cause the surface strength of the sleeve to decrease.

[0021] According to some embodiments of the present invention, the opening width D1 of the pit structure satisfies: ; and / or, the depth H1 of the pit structure satisfies: ; and / or, the spacing between two adjacent pit structures along the circumferential direction of the sleeve is 100μm-120μm; and / or, the spacing between two adjacent pit structures along the axial direction of the sleeve is 100μm-120μm.

[0022] An appropriate opening width is conducive to ensuring that the pit structure can effectively store and release lubricating oil. A smaller width helps to maintain the stability of the oil film, while a larger width improves the fluidity of the lubricating oil. The present invention sets the opening width in the above range to ensure that the pit structure can effectively store and release lubricating oil while ensuring that the oil film has sufficient stability and fluidity. A moderate pit depth helps to form a stable oil film to reduce friction and sleeve wear, ensuring that the pit structure can store enough lubricating oil while avoiding structural weakness caused by excessive pit depth. The design of the circumferential spacing ensures that the pit structure can evenly distribute the lubricating oil when the sleeve rotates, maintain dynamic balance, and reduce vibration and noise. The design of the axial spacing ensures that the lubricating oil is evenly distributed along the length of the sleeve, which helps to prevent local overheating of the sleeve and reduce wear.

[0023] In some embodiments, a processing area is provided on the circumferential wall of the sleeve, the pit structures are all located in the processing area, the axial width of the processing area along the sleeve is 30㎜-40㎜; and / or, the circumferential length of the processing area along the sleeve is 141㎜-142㎜; and / or, the area of ​​the processing area is 65%-75% of the area of ​​the circumferential wall of the sleeve.

[0024] The circumferential width of the processing zone enables the pit structure to cover the key contact area of ​​the sleeve, providing sufficient lubrication support for the contact area, which is conducive to forming a uniform oil film when the sleeve rotates. The design of the axial length of the processing zone ensures that the processing zone can cover the entire effective length of the sleeve, especially in long-axis applications, to ensure that the lubricant is evenly distributed along the axial direction and reduce local wear on the circumferential wall of the sleeve. By controlling the ratio of the area of ​​the processing zone to the area of ​​the circumferential wall of the sleeve, on the one hand, it is beneficial for the processing zone to cover most of the surface of the sleeve, providing sufficient lubrication support for the contact area between the sleeve and the metal pipe, while retaining a certain non-processing area to maintain the structural integrity and strength of the sleeve.

[0025] In some embodiments, the width D2 of the chip groove satisfies: ; and / or, the depth H2 of the chip groove satisfies: ; and / or, the helix angle β of the chip groove satisfies: ; and / or, the pitch of the chip groove is 2mm-3mm.

[0026] In this way, by precisely designing the width, depth, number, helix angle and pitch of the chip grooves, it is ensured that the lubricating oil can flow and distribute efficiently, forming a uniform oil film and reducing friction and wear.

[0027] In some embodiments, a wear-resistant layer is disposed on the outer wall of the sleeve, and the thickness of the wear-resistant layer is preferably 15 μm-30 μm, wherein the pit structure and the chip removal groove are disposed on the wear-resistant layer. The wear-resistant layer is preferably a ceramic layer.

[0028] The wear-resistant layer can significantly improve the wear resistance of the sleeve surface and reduce the wear caused by long-term use, thereby extending the service life of the sleeve, reducing the frequency of sleeve replacement and maintenance, and thus reducing the operating cost of the straightener. Ceramic materials have extremely high hardness and can significantly improve the wear resistance of the sleeve surface and reduce the wear caused by friction. Ceramic materials have excellent corrosion resistance and can protect the sleeve from chemical corrosion. At the same time, the present invention sets the thickness of the wear-resistant layer within the above range, which is conducive to ensuring that the ceramic layer provides sufficient protection for the sleeve without significantly increasing the weight of the sleeve or affecting its dimensional accuracy.

[0029] According to some embodiments of the present invention, the roughness Ra of the peripheral wall of the sleeve satisfies: This helps the lubricating oil form a stable oil film on the sleeve surface.

[0030] In the second aspect, the present invention provides a roller for use in a straightening machine, comprising: a core shaft; at least one rotating frame, the rotating frame comprising a retaining frame and a needle roller, the retaining frame being sleeved on the outer circumference of the core shaft, the needle roller being arranged on the retaining frame and in rolling contact with the core shaft; a bearing outer ring being sleeved on the outer side of the rotating frame and in contact with the needle roller; the above-mentioned sleeve, the sleeve being sleeved on the outer side of the bearing outer ring and having an interference fit with the bearing outer ring; a washer being sleeved on the outer circumference of the core shaft and sealing one end of the bearing outer ring along the axial direction of the sleeve; a limiting ring being sleeved on the outer circumference of the core shaft and located on the side of the washer facing away from the bearing outer ring.

[0031] The roller of the present invention, by applying the above-mentioned sleeve, the concave structure of the sleeve and the design of the wear-resistant layer ensure the effective distribution of lubricating oil, reduce the friction and wear of the sleeve, and improve the service life of the roller. During long-term use, burrs and metal particles shed from the metal pipe are collected in the concave structure and discharged through the chip discharge groove, thereby improving the contact quality between the roller and the metal pipe, which is conducive to improving product quality.

[0032] The use of the limit ring prevents the axial displacement of the internal structure of the roller, ensuring the stability of the roller under high load and high frequency operating conditions. By protecting the internal structure from the influence of the external environment, it is helpful to extend the service life of the roller and reduce the maintenance requirements.

[0033] In a third aspect, the present invention further provides a sleeve processing method for processing the above-mentioned sleeve, the processing method comprising the following steps: processing a pit structure on a cylinder body to obtain a primary processing part; processing a chip removal groove on the primary processing part to obtain a secondary processing part, i.e., the sleeve

[0034] The sleeve processing method of the present invention ensures the accuracy of the processing steps and improves the overall performance of the sleeve by processing the pit structure and the chip groove in steps. The combined design of the pit structure and the chip groove improves the lubrication effect of the contact area between the metal pipe and the sleeve on the one hand, and on the other hand, the impurities falling off the metal pipe can be collected by the pit structure and discharged through the chip groove, which is conducive to improving the quality of the processed product.

[0035] In some embodiments, the step of machining a pit structure on the barrel member includes: positioning and calibrating the barrel member; controlling the laser device to rotate around the circumference of the barrel member according to a first machining parameter, and scanning and machining a plurality of pit structures on the circumferential wall of the barrel member, wherein the first machining parameter includes: an opening width D1 of the pit structure, a depth H1 of the pit structure, a spacing distance of the pit structure along the circumference of the barrel member, a spacing distance of the pit structure along the axial direction of the barrel member, a width of a machining area, and a length of a machining area;

[0036] The step of machining a chip groove on the primary workpiece includes: positioning and calibrating the primary workpiece; controlling the laser device to be fixed, controlling the axial movement of the primary workpiece according to a second machining parameter, and controlling the rotation of the primary workpiece, scanning the peripheral wall of the primary workpiece to machine the chip groove, wherein the second machining parameter includes: the width D2 of the chip groove, the depth H2 of the chip groove, the pitch of the chip groove, and the helix angle β of the chip groove.

[0037] In this way, the use of laser equipment allows for high-precision processing of the pit structure and the drain groove, ensuring that the size and position of each pit structure and drain groove meet the design specifications. Laser processing has a high degree of consistency and repeatability, which can ensure that the pit and drain groove structure of each sleeve meets the same quality standards. Laser processing is a non-contact method that reduces mechanical stress and potential damage to the barrel. Through this precise laser processing method, a pit structure that meets the design requirements can be formed on the barrel first, laying a structural foundation for the subsequent chip groove processing and setting. On the basis of the pit structure, the present invention uses laser equipment to process the primary processing part to form a chip groove that meets the design requirements. This method not only improves the processing efficiency, but also ensures the final performance and reliability of the sleeve.

[0038] In a fourth aspect, the present invention further provides a straightening machine, comprising: the above-mentioned sleeve, or the above-mentioned roller, or a sleeve made by the above-mentioned sleeve processing method.

[0039] The straightening machine of the present invention has a concave structure and a spiral chip groove structure design, which is conducive to evenly distributing the lubricating oil in the contact area between the roller and the metal pipe, improving the contact quality between the roller and the metal pipe, and thus extending the service life of the straightening machine. At the same time, impurities such as burrs dropped from the metal pipe can be collected by the concave structure and discharged through the chip groove, which is conducive to improving the quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0041] Figure 1 A schematic structural diagram of a roller according to an embodiment of the present invention;

[0042] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle;

[0043] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure at the middle BB;

[0044] Figure 4 It is a schematic diagram of the exploded structure of the roller according to an embodiment of the present invention;

[0045] Figure 5 The present invention is a flowchart of the steps of the sleeve processing method according to an embodiment of the present invention.

[0046] Description of reference numerals:

[0047] 100, sleeve;

[0048] 110. Pit structure;

[0049] 120, chip groove;

[0050] 130. Processing area;

[0051] 200, roller;

[0052] 210, mandrel;

[0053] 220, rotating frame; 221, retaining frame; 222, needle roller;

[0054] 230, outer ring of bearing;

[0055] 240, gasket;

[0056] 250. Limiting ring.

[0057] The above drawings have shown clear embodiments of the present invention, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present invention in any way, but to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0058] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0059] Since there may be a certain amount of burrs or impurities such as metal particles on the outer wall of the metal pipe, the burrs on the metal pipe may detach and adhere to the roller of the straightening machine during the straightening process of the prior art. With the passage of time and long-term use, the roller of the traditional straightening machine will be severely worn, thereby reducing the surface quality of the roller of the straightening machine and resulting in reduced quality of the processed product.

[0060] In view of this, the present invention provides a sleeve, a roller, a sleeve processing method and a straightening machine, in which the chip groove on the sleeve is at least partially connected to the pit structure, and the burrs and other structures on the metal pipe fittings enter the pit structure as the roller rotates and are discharged from the chip grooves, which is beneficial to reduce the influence of burrs and other impurities on the surface quality of the sleeve, and makes the lubricating oil film between the metal pipe fittings and the roller sleeve evenly distributed, avoiding excessive wear of the sleeve, thereby extending the service life of the roller to ensure the quality of the processed products.

[0061] The technical solution of the present invention and how the technical solution of the present invention solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0062] refer to Figures 1 to 4 In a first aspect, an embodiment of the present invention provides a sleeve 100, which is applied to a roller 200 of a straightening machine. By way of example, the straightening machine may include but is not limited to a plate straightening machine, a profile straightening machine, a pipe straightening machine, a wire straightening machine, and a multi-roller straightening machine.

[0063] A plurality of pit structures 110 are provided on the peripheral wall of the sleeve 100, and a chip groove 120 is also provided on the peripheral wall of the sleeve 100. The chip groove 120 extends spirally around the axis of the sleeve 100, and the chip groove 120 extends through and connects at least part of the plurality of pit structures 110. Exemplarily, the plurality of pit structures 110 can be evenly distributed on the peripheral wall of the sleeve 100, and the spirally extending chip groove 120 passes through part of the pit structures 110. In this case, the pit structures 110 evenly distributed on the peripheral wall of the sleeve 100 can make the lubricating liquid more evenly distributed, and the lubricating oil and dissolved substances in the pit structures 110 overlapping with the chip groove 120 can be discharged along the chip groove 120. Alternatively, the arrangement of multiple pit structures 110 can also be arranged at intervals along the direction of the chip groove 120 on the peripheral wall of the sleeve 100. In this case, the overlapping area between the pit structure 110 and the chip groove 120 is large (even completely overlapping), and the lubricating oil and dissolved substances in all the pit structures 110 can be discharged along the chip groove 120. The distribution area of ​​the corresponding pit structure 110 is reduced, which will have a certain impact on the lubrication effect.

[0064] The sleeve 100 of the present invention is provided with a pit structure 110 and a spiral chip groove 120 on the circumferential wall. On the one hand, during straightening, the outer wall of the metal pipe is coated with lubricating oil, and then the metal pipe is fed and straightened. The sleeve 100 contacts the metal pipe through the friction pair, and the lubricating oil on the metal pipe can be stored in the pit structure 110. When the contact area between the metal pipe and the sleeve 100 is oil-deficient, the pit structure 110 can release the lubricating oil to ensure the feeding effect of the metal pipe and avoid surface wear of the metal pipe due to poor surface contact between the sleeve 100 and the metal pipe during the straightening process. At this time, the chip groove 120 spirally extending along the axis of the sleeve 100 can make the lubricating oil evenly distributed along the axial and circumferential directions of the sleeve 100 at the same time, thereby improving the lubrication effect between the metal pipe and the sleeve 100.

[0065] On the other hand, during the feeding process, due to the contact and friction between the metal pipe and the sleeve 100, burrs or metal particles on the outer wall of the metal pipe can enter the pit structure 110 with the rotation of the roller 200 for storage, thereby preventing burrs or metal particles from entering the contact area between the sleeve 100 and the metal pipe, resulting in reduced quality of the outer wall of the metal pipe or wear of the outer wall of the sleeve 100. Since the chip groove 120 is connected to at least part of the pit structure 110, some impurities entering the pit structure 110 can be discharged from the chip groove 120, which is conducive to reducing the impact of burrs and other impurities on the surface quality of the sleeve 100, thereby extending the service life of the roller 200 to ensure the quality of the processed products.

[0066] In some embodiments of the present invention, the depth H1 of the pit structure 110 satisfies: The opening width D1 of the pit structure 110 satisfies: ; The depth H2 of the chip groove 120 satisfies: ; The width D2 of the chip groove 120 satisfies: ; The pitch P of the chip groove 120 satisfies: .

[0067] Wherein, d is the diameter of the sleeve 100, L is the length of the sleeve 100, m is the thickness of the sleeve 100, p is the first calculation coefficient, q is the second calculation coefficient, r is the third calculation coefficient, s is the fourth calculation coefficient and t is the fifth calculation coefficient, and the first calculation coefficient p satisfies: ; and / or, the second calculation coefficient q satisfies: ; and / or, the third calculation coefficient r satisfies: ; and / or, the fourth calculation coefficient s satisfies: ; and / or, the fifth calculation coefficient t satisfies: .

[0068] For example, the value of the first calculation coefficient p can be 7*10 -4 μm / mm 3 ,7.1*10 -4 μm / mm 3 or 7.2*10 -4 μm / mm 3 The value of the second calculation coefficient q can be 5.2*10 -3 μm / mm 3 ,5.3*10 -3 μm / mm 3 ,5.4*10 -3 μm / mm 3 ,5.5*10 -3 μm / mm 3 or 5.6*10 -3 μm / mm 3 The value of the third calculation coefficient r can be 6.2*10 -4 μm / mm 3 、6.3*10 -4 μm / mm 3 Or 6.4*10 -4 μm / mm 3 The value of the fourth calculation coefficient s can be 3.4*10 -3 μm / mm 3 ,3.5*10 -3 μm / mm 3 ,3.6*10 -3 μm / mm 3 ,3.7*10 -3 μm / mm 3 or 3.8*10 -3 μm / mm 3 The value of the fifth calculation coefficient t can be 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm or 3.5 mm. Of course, the first calculation coefficient p, the second calculation coefficient q, the third calculation coefficient r, the fourth calculation coefficient s and the fifth calculation coefficient t can also be other values, and designers can choose according to design requirements, which is not limited in the embodiment of the present invention.

[0069] In this way, by selecting a suitable calculation coefficient, matching the structural dimensions of the sleeve 100 corresponding to the straightening machine model, and designing the pit structure 110 and the chip groove 120 with suitable structural dimensions according to the diameter d of the sleeve 100, the length L of the sleeve 100 and the thickness m of the sleeve 100, so that, under the premise of meeting the structural strength of the sleeve 100, the composite structure formed by the pit structure 110 and the chip groove 120 on the sleeve 100 can simultaneously have a good effect on dispersing the lubricating oil and a good effect on collecting impurities on the surface of the sleeve 100.

[0070] In some embodiments, a plurality of dimple structures 110 may be distributed at intervals along the circumference of the sleeve 100 to ensure that when the sleeve 100 rotates, the lubricating oil can evenly cover the entire circumferential wall surface to form a uniform oil film, which helps to reduce friction and surface wear of the sleeve 100. Alternatively, a plurality of dimple structures 110 may also be distributed at intervals along the axial direction of the sleeve 100, so that the lubricating oil can be evenly distributed along the entire length of the sleeve 100, which helps to prevent local overheating of the sleeve 100 and reduce wear of the sleeve 100. Alternatively, the dimple structures 110 may also be distributed at intervals along the circumference of the sleeve 100 and at intervals along the axial direction of the sleeve 100, so that the lubricating oil can be dispersed to various places on the circumferential wall of the sleeve 100 to improve the lubrication effect.

[0071] refer to Figure 1 and Figure 4 According to some embodiments of the present invention, the plurality of pit structures 110 may be divided into a plurality of groups, and the plurality of groups of pit structures 110 are spaced apart along the circumference of the sleeve 100, which helps to ensure that when the sleeve 100 rotates, each group of pit structures 110 can alternately contact the surface of the metal pipe, thereby providing continuous lubrication support for the contact area between the sleeve 100 and the metal pipe.

[0072] Each group includes a plurality of pit structures 110 spaced apart along the axial direction of the sleeve 100 , so that the lubricating oil can be evenly distributed over the entire length of the sleeve 100 , which helps to ensure that there is sufficient lubrication area between the surface of the sleeve 100 and the metal pipe.

[0073] In some embodiments, the total area of ​​the pit structure 110 overlapping with the chip groove 120 is 35%-45% of the total area of ​​all the pit structures 110. Exemplarily, the total area of ​​the pit structure 110 overlapping with the chip groove 120 can be 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44% or 45% of the total area of ​​all the pit structures 110. Preferably, the total area of ​​the pit structure 110 overlapping with the chip groove 120 is 40% of the total area of ​​all the pit structures 110. Of course, the overlapping area of ​​the chip groove 120 and the pit structure 110 can also be other values, which is not limited by the present invention. Through the above-mentioned arrangement, the present invention avoids the overlapping area of ​​the chip groove and the pit structure being too small (less than 35%), which does not improve the uniform distribution of the lubricating oil and has a poor effect of discharging impurities; on the other hand, it avoids the overlapping area of ​​the chip groove and the pit structure being too large (more than 45%), which leads to a decrease in the surface strength of the sleeve 100.

[0074] According to some embodiments of the present invention, the opening width D1 of the pit structure 110 satisfies: , for example, the opening width D1 of the pit structure 110 can be 35μm, 36μm, 37μm, 38μm, 39μm, 40μm, 41μm, 42μm, 43μm, 44μm, 45μm, 46μm, 47μm, 48μm, 49μm or 50μm. Of course, the opening width D1 of the pit structure 110 can also be other values, and the present invention is not limited to this. A smaller opening width helps to maintain the stability of the oil film, while a larger width improves the fluidity of the lubricating oil. The present invention sets the opening width within the above range to ensure that the pit structure 110 can effectively store and release the lubricating oil while ensuring that the oil film has sufficient stability and fluidity.

[0075] Optionally, the shape of the opening may include but is not limited to circular, annular, polygonal and the like.

[0076] It can be understood that the pit structure 110 can be a structure formed by the peripheral wall of the sleeve 100 being recessed toward the inner wall. For the convenience of processing, the width of the pit structure 110 gradually decreases in the radial direction close to the axis of the sleeve 100. The above-mentioned opening width D1 refers to the spacing distance at the maximum opening span of the pit structure 110.

[0077] The depth H1 of the pit structure 110 satisfies: For example, the depth H1 of the pit structure 110 may be 5 μm, 6 μm, 7 μm, 8 μm or 9 μm. Of course, the depth H1 of the pit structure 110 may also be other values, which is not limited by the present invention. A moderate depth helps to form a stable oil film to reduce friction and wear of the sleeve 100, ensure that the pit structure 110 can store enough lubricating oil, and avoid the reduction of the structural strength of the sleeve 100 caused by the pit structure 110 being too deep.

[0078] The spacing between two adjacent pit structures 110 along the circumference of the sleeve 100 is 100μm-120μm. Exemplarily, the spacing between two adjacent pit structures 110 along the circumference of the sleeve 100 may be 100μm, 101μm, 102μm, 103μm, 104μm, 105μm, 106μm, 107μm, 108μm, 109μm, 110μm, 111μm, 112μm, 113μm, 114μm, 115μm, 116μm, 117μm, 118μm, 119μm or 120μm. Of course, the spacing between two adjacent pit structures 110 along the circumference of the sleeve 100 may also be other values, which is not limited by the present invention. The design of the circumferential spacing is conducive to ensuring that the pit structure 110 can evenly distribute lubricating oil when the sleeve 100 rotates, maintain dynamic balance, and reduce the vibration of the sleeve 100 to reduce noise.

[0079] The spacing between two adjacent pit structures 110 along the axial direction of the sleeve 100 is 100 μm-120 μm. For example, the spacing between two adjacent pit structures 110 along the axial direction of the sleeve 100 can be 100 μm, 101 μm, 102 μm, 103 μm, 104 μm, 105 μm, 106 μm, 107 μm, 108 μm, 109 μm, 110 μm, 111 μm, 112 μm, 113 μm, 114 μm, 115 μm, 116 μm, 117 μm, 118 μm, 119 μm or 120 μm. Of course, the spacing between two adjacent pit structures 110 along the axial direction of the sleeve 100 can also be other values, which is not limited by the present invention. The design of the axial spacing is conducive to ensuring that the lubricating oil is evenly distributed along the length of the sleeve 100, which helps to prevent local overheating of the sleeve 100 and reduce wear.

[0080] In this way, by precisely controlling the opening width, depth, and circumferential and axial spacing of the pit structure 110, the sleeve 100 achieves a good balance in lubrication, thermal management, and mechanical properties, which is beneficial to improving the overall performance and reliability of the straightening machine.

[0081] In some embodiments, a processing area 130 is provided on the peripheral wall of the sleeve 100, and the pit structures 110 are all located in the processing area 130. The axial width of the processing area 130 along the sleeve 100 is 30 mm to 40 mm. For example, the axial width of the processing area 130 along the sleeve 100 can be 30 mm, 31 mm, 32 mm, 33 mm, 34 mm, 35 mm, 36 mm, 37 mm, 38 mm, 39 mm or 40 mm. Of course, the axial width of the processing area 130 along the sleeve 100 can also be other values, and the present invention is not limited to this. The design of the axial width of the processing area 130 is conducive to ensuring that the processing area 130 can cover the effective axial length of the sleeve 100, especially in long shaft applications, which can ensure that the lubricating oil is evenly distributed along the axial direction of the sleeve 100 and reduce the local wear of the peripheral wall of the sleeve 100.

[0082] The circumferential length of the processing area 130 along the sleeve 100 is 141 mm to 142 mm. For example, the circumferential length of the processing area 130 along the sleeve 100 can be 141 mm or 142 mm. Of course, the circumferential length of the processing area 130 along the sleeve 100 can also be other values, which is not limited by the present invention. The circumferential length design of the processing area 130 enables the pit structure 110 to cover the key contact area of ​​the sleeve 100, providing sufficient lubrication support for the contact area, which is conducive to forming a uniform oil film when the sleeve 100 rotates.

[0083] The area of ​​the processing zone 130 is 65%-75% of the area of ​​the peripheral wall of the sleeve 100. Exemplarily, the area of ​​the processing zone 130 can be 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74% or 75% of the area of ​​the peripheral wall of the sleeve 100. Of course, the ratio of the area of ​​the processing zone 130 to the area of ​​the peripheral wall of the sleeve 100 can also be other values, and the present invention is not limited to this.

[0084] By controlling the ratio of the area of ​​the processing area 130 to the area of ​​the peripheral wall of the sleeve 100, it is beneficial to enable the processing area 130 to cover most of the surface of the sleeve 100, provide sufficient lubrication support for the contact area between the sleeve 100 and the metal pipe, and at the same time retain a certain non-processing area to maintain the structural integrity and strength of the sleeve 100.

[0085] In some embodiments, the width D2 of the chip groove 120 satisfies: For example, the width D2 of the chip groove 120 can be 55 μm, 56 μm, 57 μm, 58 μm, 59 μm, 60 μm, 61 μm, 62 μm, 63 μm, 64 μm, 65 μm, 66 μm, 67 μm, 68 μm, 69 μm or 70 μm. Of course, the width D2 of the chip groove 120 can also be other values, which is not limited by the present invention. The appropriate width ensures that the chip groove 120 can accommodate enough lubricating oil to improve the stability of the oil film, and can also guide the lubricating oil to flow along the chip groove 120, so that the lubricating oil is evenly distributed and impurities in the pit structure 110 are discharged.

[0086] It can be understood that the chip groove 120 can be a structure formed by the peripheral wall of the sleeve 100 being recessed toward the inner wall. For the convenience of processing, the width of the chip groove 120 gradually decreases in the radial direction close to the axis of the sleeve 100. The width D2 of the chip groove 120 mentioned above refers to the spacing distance between the chip grooves 120 at the maximum opening span.

[0087] The depth H2 of the chip groove 120 satisfies: , for example, the depth H2 of the chip groove 120 can be 7 μm, 8 μm or 9 μm. Of course, the depth H2 of the chip groove 120 can also be other values, and the present invention is not limited to this. The present invention controls the depth of the chip groove 120 within the above range, which can ensure that the chip groove 120 provides sufficient volume to guide the flow of lubricating oil without weakening the structural strength of the sleeve 100, so that the lubricating oil is evenly distributed.

[0088] The helix angle β of the chip groove 120 satisfies: For example, the helix angle β of the chip groove 120 can be 65°, 66°, 67°, 68°, 69°, 70°, 71°, 72°, 73°, 74° or 75°. Of course, the helix angle β of the chip groove 120 can also be other values, which is not limited by the present invention.

[0089] The design of the helix angle affects the flow path of the lubricating oil on the surface of the sleeve 100. A moderate helix angle is conducive to evenly covering the entire surface of the sleeve 100 with the lubricating oil, reducing the friction between the sleeve 100 and the metal pipe and the wear of the sleeve 100. When the helix angle β is too small (less than 65°), the distribution area of ​​the chip groove 120 on the peripheral wall of the sleeve 100 is small, and the effect of dispersing the lubricating oil is not good. When the helix angle β is too large (exceeding 75°), the surface strength of the sleeve 100 will be reduced, thereby shortening the service life of the sleeve 100. The present invention sets the helix angle β of the chip groove 120 within the above range, which can ensure excellent lubrication effect while increasing the life of the sleeve 100.

[0090] It can be understood that the helix angle β can be expressed by the formula Calculated.

[0091] The pitch of the chip flute 120 is 2.5 mm to 3.5 mm. For example, the pitch of the chip flute 120 can be 2.5 mm or 3.5 mm. Of course, the pitch of the chip flute 120 can also be other values, which is not limited by the present invention. The pitch of the chip flute 120 will affect the spacing of the chip flute 120 and the length of the lubricating oil flow path. An appropriate pitch is conducive to forming a continuous oil film of the lubricating oil on the surface of the sleeve 100.

[0092] In this way, by precisely designing the width, depth, helix angle and pitch of the chip groove 120 , it is ensured that the lubricating oil can flow and distribute efficiently, forming a uniform oil film, thereby reducing friction and wear.

[0093] In some embodiments, a wear-resistant layer is provided on the outer wall of the sleeve 100. The wear-resistant layer can significantly improve the wear resistance of the surface of the sleeve 100 and reduce the wear caused by long-term use. In addition, the service life of the sleeve 100 is extended, the frequency of replacement and maintenance of the sleeve 100 is reduced, and the operating cost of the straightening machine is reduced. It should be noted that when a wear-resistant layer is provided on the outer wall of the sleeve 100, at least part of the pit structure 110 and the chip groove 120 are provided on the wear-resistant layer. In other words, the pit structure 110 and the chip groove 120 can be partially provided on the wear-resistant layer and partially located on the non-wear-resistant layer of the sleeve 100, or the pit structure 110 and the chip groove 120 can both be provided on the wear-resistant layer.

[0094] According to some embodiments of the present invention, the wear-resistant layer may be a ceramic layer. The ceramic material has extremely high hardness, which can significantly improve the wear resistance of the surface of the sleeve 100 and reduce the wear caused by the friction between the sleeve 100 and the metal pipe. At the same time, the ceramic material has excellent corrosion resistance and can protect the sleeve 100 from corrosion by chemical substances.

[0095] The thickness of the wear-resistant layer is 15 μm-30 μm. For example, the thickness of the wear-resistant layer can be 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm, 21 μm, 22 μm, 23 μm, 24 μm, 25 μm, 26 μm, 27 μm, 28 μm, 29 μm or 30 μm. Of course, the thickness of the wear-resistant layer can also be other values, which is not limited by the present invention. In this way, it is helpful to ensure that the ceramic layer provides sufficient protection for the sleeve 100 without significantly increasing the weight of the sleeve 100 or affecting its dimensional accuracy.

[0096] According to some embodiments of the present invention, the roughness Ra of the peripheral wall of the sleeve 100 satisfies: For example, the roughness Ra of the peripheral wall of the sleeve 100 may be 3.2 μm, 4 μm, 5 μm, 6 μm or 6.3 μm. Of course, the roughness Ra of the peripheral wall of the sleeve 100 may also be other values, which is not limited by the present invention.

[0097] Thus, a suitable roughness Ra of the peripheral wall of the sleeve 100 helps the lubricant to form a stable oil film on the surface of the sleeve 100. If the roughness of the peripheral wall of the sleeve 100 is too small (less than 3.2 μm), the peripheral wall of the sleeve 100 is relatively smooth, and the ability to retain lubricant is poor, which may lead to poor lubrication between the sleeve 100 and the metal pipe. If the roughness of the peripheral wall of the sleeve 100 is too large (more than 6.3 μm), the peripheral wall of the sleeve 100 is too rough, and the sleeve 100 is greatly worn when in contact with the metal pipe, resulting in a shortened service life of the sleeve 100.

[0098] refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 In a second aspect, the present invention provides a roller 200 for use in a straightening machine. The roller 200 may include: a core shaft 210, a rotating frame 220, a bearing outer ring 230 and the above-mentioned sleeve 100.

[0099] The core shaft 210 serves as the central axis of the roller 200 , provides basic structural support and a rotation axis, and carries other components of the roller 200 .

[0100] There is at least one rotating frame 220, and illustratively, there may be one rotating frame 220, or there may be multiple rotating frames 220, which are arranged at intervals along the axial direction of the core shaft 210. The rotating frame 220 may include a retaining frame 221 and a needle roller 222, wherein the retaining frame 221 is sleeved on the outer periphery of the core shaft 210, and the needle roller 222 is arranged on the retaining frame 221 and in rolling contact with the core shaft 210. The rotating frame 220 can rotate smoothly through the rolling contact between the needle roller 222 and the core shaft 210, thereby reducing friction loss.

[0101] The outer ring 230 of the bearing is sleeved on the outside of the rotating frame 220 and contacts the needle roller 222, providing support and stability for the roller 200, ensuring that the roller 200 can still operate smoothly under high load during the operation of the straightening machine.

[0102] The sleeve 100 is sleeved on the outer side of the bearing outer ring 230 and has an interference fit with the bearing outer ring 230 , so that the sleeve 100 and the bearing outer ring 230 are tightly combined to prevent sliding and loosening, thereby improving the stability of the roller 200 .

[0103] The roller 200 of the present invention, by applying the above-mentioned sleeve 100, the concave structure 110 of the sleeve 100 and the design of the wear-resistant layer ensure the effective distribution of lubricating oil, reduce the friction and wear of the sleeve 100, and improve the service life of the roller 200. During long-term use, the burrs and metal particles detached from the metal pipe are collected in the concave structure 110 and discharged under the action of the chip groove 120, thereby improving the contact quality between the roller 200 and the metal pipe, which is conducive to improving product quality.

[0104] In some embodiments, the roller 200 further includes a washer 240 and a limiting ring 250 .

[0105] The washer 240 is sleeved on the outer periphery of the core shaft 210 and sealed at one end of the bearing outer ring 230 along the axial direction of the sleeve 100. The washer 240 protects the internal structure from the influence of the external environment, which is beneficial to extend the service life of the roller 200 and reduce maintenance requirements.

[0106] The limiting ring 250 is sleeved on the outer periphery of the core shaft 210 and is located on the side of the washer 240 facing away from the bearing outer ring 230. The use of the limiting ring 250 prevents the axial displacement of the internal structure of the roller 200 and ensures the stability of the roller 200 under high load and high frequency operating conditions.

[0107] refer to Figure 5 In a third aspect, the present invention further provides a sleeve processing method for processing the sleeve 100, the processing method comprising the following steps:

[0108] S1: processing a pit structure 110 on a cylinder part to obtain a primary processed part;

[0109] S2: machining a chip groove 120 on the primary machined part to obtain a secondary machined part, i.e., a sleeve 100. For example, in step S1, the pit structure 110 can be formed by punching the surface of the cylinder part by a grinding tool, or the pit structure 110 can be machined on the cylinder part by a tool, or the pit structure 110 can be machined on the outer wall of the cylinder part by a laser device.

[0110] Similarly, in step S2 , the chip groove 120 can be formed by machining along the designed trajectory of the chip groove 120 using a tool, or the chip groove 120 can be machined on the outer wall of a primary workpiece by a laser device.

[0111] The sleeve processing method of the present invention ensures the accuracy of the processing steps and improves the overall performance of the sleeve 100 by processing the pit structure 110 and the chip groove 120 in steps. The combined design of the pit structure 110 and the chip groove 120, on the one hand, improves the lubrication effect of the contact area between the metal pipe and the sleeve 100, and on the other hand, the impurities falling off the metal pipe can be collected by the pit structure 110 and discharged through the chip groove 120, which is conducive to improving the quality of the processed product.

[0112] Optionally, the sleeve processing method may further include: providing a wear-resistant layer on the outer wall of the barrel. The present invention may adopt conventional thermal spraying, laser cladding, electroplating, etc. to provide the wear-resistant layer. Exemplarily, the barrel may be placed on an electroplating processing table, and the wear-resistant layer may be formed by electroplating on the surface of the barrel.

[0113] It can be understood that in this embodiment, the pit structure 110 and the chip groove 120 on the sleeve 100 are processed on the wear-resistant layer. Processing the pit structure 110 and the chip groove 120 on the wear-resistant layer has little effect on the structural strength of the sleeve 100, which is beneficial to extending the service life of the sleeve 100.

[0114] Furthermore, the wear-resistant layer may be a ceramic layer with high hardness, which prolongs the service life of the sleeve 100. Ceramic materials have excellent corrosion resistance and can protect the sleeve 100 from corrosion by chemical substances.

[0115] In some embodiments, machining the pit structure 110 on the barrel may include the following steps:

[0116] Positioning and calibration of cylinder parts;

[0117] According to the first processing parameter, the laser device is controlled to rotate around the circumference of the cylinder member, and a plurality of pit structures 110 are scanned and processed on the circumferential wall of the cylinder member.

[0118] Among them, the first processing parameters include: the opening width D1 of the pit structure 110, the depth H1 of the pit structure 110, the spacing distance of the pit structure 110 along the circumference of the cylinder part, the spacing distance of the pit structure 110 along the axial direction of the cylinder part, the width of the processing area 130 and the length of the processing area 130.

[0119] Exemplarily, the positioning and calibration process can be to place the cylinder part on the workbench axially upward at the work station. Select appropriate laser parameters according to the first processing parameters, for example: pulse frequency 1300Hz-1600Hz, pulse width 15ps-20ps, number of scans 1, defocus amount -1mm-0mm, scanning speed 3mm / s-4mm / s, and blow auxiliary inert gas (argon or nitrogen), and set its gas pressure to 0.50MPa-1.00MPa. After the positioning is completed, the laser head of the laser scans along the circumferential wall of the cylinder part to form a pit structure 110. During the processing, the laser energy density can be 35J / cm 2 -40J / cm 2 , a pit structure 110 with an opening width of 35 μm-50 μm and a depth of 5 μm-9 μm is prepared, and the pit structure 110 is arranged every 100 μm along the axial and circumferential directions of the sleeve 100.

[0120] In this way, the use of laser equipment allows high-precision processing of the pit structure 110, ensuring that the size and position of each pit structure 110 meet the design specifications. Laser processing can ensure that the workpiece has high consistency and repeatability, ensuring that the pit structure 110 of each sleeve 100 meets the same quality standards. Laser processing is a non-contact method that reduces mechanical stress and potential damage to the barrel. Through this precise laser processing method, a pit structure 110 that meets the design requirements can be formed on the barrel, laying a structural foundation for the subsequent processing of the chip groove 120. This method can not only improve processing efficiency, but also ensure the ultimate performance and reliability of the sleeve 100.

[0121] In some embodiments, the steps of machining the chip groove 120 on a workpiece are as follows:

[0122] Position and calibrate the workpiece once;

[0123] The laser device is controlled to be fixed, and according to the second processing parameter, the primary processing workpiece is controlled to move axially and rotate, and the chip groove 120 is scanned and processed on the peripheral wall of the primary processing workpiece.

[0124] The second machining parameters include: a width D2 of the chip groove 120 , a depth H2 of the chip groove 120 , a pitch of the chip groove 120 , and a helix angle β of the chip groove 120 .

[0125] For example, the positioning calibration process can be to place the primary workpiece on the workbench with the axis horizontally at the workstation. According to the second processing parameter, select appropriate laser parameters, for example: pulse frequency 1600Hz-2000Hz, pulse width 10ps-15ps, number of scans 2, defocusing amount -1mm-0mm, scanning speed 2mm / s-2.5mm / s, and blow auxiliary inert gas (argon or nitrogen), and set its gas pressure to 0.50MPa-1.00MPa. According to the helix angle The calculated helix angle β is 70.54°, and the pulse laser energy density is adjusted to 30 J / cm 2 -35J / cm 2 The primary workpiece is fed in a rotational manner and rotates during the circumferential movement, forming a chip groove 120 with a width of 55 μm-70 μm and a depth of 7 μm-9 μm on the peripheral wall of the primary workpiece.

[0126] It can be understood that in order to ensure product consistency, when there are multiple chip grooves 120 on the sleeve 100, the specific number of chip grooves 120 can be derived when the pitch and helix angle β of the chip groove 120 and the diameter of the sleeve 100 are determined.

[0127] When processing a plurality of chip grooves 120 , the workpiece may be reset multiple times and rotated to form a plurality of chip grooves 120 . For example, the number of resets may be 1-3 times to form 2-4 chip grooves 120 .

[0128] It should be noted that when forming a plurality of chip removal grooves 120 , a workpiece needs to be rotated at a certain angle so that the chip removal grooves 120 are spaced apart along the circumferential direction on the outer wall of the sleeve 100 .

[0129] Thus, the use of laser equipment allows high-precision machining of the chip groove 120, ensuring that the size and position of the chip groove 120 meet the design specifications. Laser machining has high consistency and repeatability, which can ensure that the structure of the chip groove 120 meets the quality standards. Laser machining is a non-contact method that reduces mechanical stress and potential damage to the barrel. Through this precise laser machining method, the chip groove 120 that meets the design requirements can be formed on the machined part in one time. This method not only improves machining efficiency, but also ensures the final performance and reliability of the sleeve 100.

[0130] Below, the sleeve of the present invention is described through multiple embodiments and comparative examples:

[0131] Embodiment 1:

[0132] The sleeve material is SKD-11 (the diameter of the barrel is 45mm, the length is 50mm, the diameter of the inner hole is 35mm, and the wall thickness is 5mm), and the following specific processing methods are used:

[0133] Pre-treatment: Use 400-mesh, 600-mesh, and 800-mesh metallographic sandpaper to rough grind the cylinder, then use W20 metallographic sandpaper to fine grind its surface, and then use W10 and W5 metallographic sandpaper for super-fine grinding. Apply abrasive paste on the sandpaper-ground sleeve surface and polish it with a polishing machine.

[0134] Electroplating: On an electroplating test bench, the treated secondary workpiece is placed in an electroplating solution containing ceramic powder heated to 86-92°C, and metal ions are deposited on the surface of the secondary workpiece through a reduction reaction. After the electroplating is completed, the sleeve is cleaned, dried and cured to improve adhesion and stability to obtain a wear-resistant layer. In this embodiment, the thickness of the wear-resistant layer is 23 μm.

[0135] Pit structure design: according to , , r is 6.2*10 -4 μm / mm 3 , s is 3.4*10 -3 μm / mm 3 The opening width of the pit structure is 38.25μm, the depth is 6.975μm, the pit structure is spaced 100μm along the circumferential direction and 100μm along the axial direction, the processing area along the circumferential length of the cylinder is 141.37mm, the axial width of the processing area along the cylinder is 32.5mm, and the area of ​​the processing area is 65% of the area of ​​the circumferential wall of the sleeve.

[0136] Pit structure processing: The laser parameters are set as follows: pulse frequency 1600Hz, pulse width 15ps, scan number 1, defocus 0mm, scan speed 4mm / s, and blowing auxiliary inert gas (nitrogen), and the gas pressure is set to 1.00MPa. After positioning is completed, the laser head scans along the wall of the cylinder to form a pit structure. During the processing, the laser energy density can be 35J / cm 2 , a pit structure is prepared.

[0137] Post-processing of the primary workpiece: Use W5 metallographic sandpaper to grind the processing area, observe with a metallographic microscope, and polish again on the polishing machine until the slag around the pit structure on the surface of the primary workpiece is removed. Then put the primary workpiece into a beaker filled with anhydrous ethanol, and put the beaker into an ultrasonic cleaner for cleaning for 15 minutes. After cleaning, take out the primary workpiece and blow dry it.

[0138] Chip groove structure design: Substitute the sleeve parameters into the helix angle , the helix angle is calculated to be 70.52°. , , , p is 7*10 -4 μm / mm 3 ,q takes the value of 5.2*10 -3 μm / mm 3 , the value of t is 2.5 mm, the width of the chip groove is 58.5 μm, the depth of the chip groove is 7.875 μm, and the pitch of the chip groove is 2.78 mm.

[0139] Chip removal processing: The laser parameters are set as follows: pulse frequency 2000Hz, pulse width 10ps, scan times 2, defocus 0mm, scan speed 2.5mm / s, and auxiliary inert gas (nitrogen) is blown, and its gas pressure is set to 1.00MPa. The pulse laser energy density is adjusted to 30J / cm 2 The primary workpiece is fed in rotation and rotates during the circumferential movement, forming a chip groove with a width of 58.5μm and a depth of 7.875μm on the peripheral wall of the primary workpiece.

[0140] Post-processing of secondary processing parts: Use W5 metallographic sandpaper to grind the processing area of ​​the secondary processing parts, and observe with the help of a metallographic microscope until the slag around the chip groove on the surface of the secondary processing parts is removed, and then polish it again on a polishing machine, and the roughness Ra needs to be controlled at 6.3μm. Then put the secondary processing parts into a beaker filled with anhydrous ethanol, and put the beaker into an ultrasonic cleaner for cleaning for 15 minutes. After cleaning, take out the secondary processing parts and blow dry them.

[0141] Assembly: Assemble the sleeve, rolling bearing, outer sleeve, needle roller, washer, limit ring and mandrel.

[0142] Embodiment 2:

[0143] Compared with Example 1, Example 2 is different in that the sleeve roughness Ra needs to be controlled at 3.2 μm. In this embodiment, r is 6.4*10 -4 μm / mm 3 , s is 3.8*10 -3 μm / mm 3 The opening width of the pit structure is 42.75μm, the depth is 7.2μm, the circumferential length of the processing area along the cylinder is 141.37mm, the axial width of the processing area along the cylinder is 37.5mm, and the area of ​​the processing area is 75% of the area of ​​the circumferential wall of the sleeve;

[0144] The value of p is 7.2*10 -4 μm / mm 3 ,q takes the value of 5.6*10 -3 μm / mm 3, the value of t is 3 mm, the width of the chip groove 120 is 63 μm, the depth of the chip groove is 8.1 μm, and the pitch of the chip groove is 3.33 mm.

[0145] Embodiment 3:

[0146] Compared with Example 1, Example 3 is different in that no electroplating treatment is performed on the sleeve surface after polishing.

[0147] Comparative Example 1:

[0148] Compared with Example 1, the difference in Comparative Example 1 is that the peripheral wall of the sleeve is not processed with chip removal grooves and pit structures, and the sleeve is not plated with a wear-resistant layer. The surface roughness Ra of the sleeve is 0.8 μm.

[0149] Comparative Example 2:

[0150] Compared with Example 1, the difference in Comparative Example 2 is that the peripheral wall of the sleeve is not processed with chip removal grooves and pit structures, and the surface roughness Ra of the sleeve is 0.8 μm.

[0151] Comparative Example 3:

[0152] Compared with Example 1, the difference in Comparative Example 3 is that only the pit structure is processed on the peripheral wall of the sleeve, and the chip removal groove is not processed. The surface roughness Ra of the sleeve is 3.2 μm.

[0153] Comparative Example 4:

[0154] Compared with Example 1, the difference in Comparative Example 4 is that only the chip removal grooves are processed on the peripheral wall of the sleeve, and the pit structure is not processed. The surface roughness Ra of the sleeve is 3.2 μm.

[0155] The sleeves of the above-mentioned embodiments and comparative examples were installed on a straightening machine for testing, and the test results shown in the following table were obtained.

[0156]

[0157] The sleeve surfaces of Example 1 and Example 2 are intact, and there are basically no scratches on the sleeve surfaces.

[0158] In Example 3, the composite texture morphology of the sleeve surface remains intact, and only a small amount of non-tactile scratches appear on the surface, which have no obvious effect on the chip removal and lubrication functions of the composite texture.

[0159] The surface of the sleeve of comparative example 1 was severely worn, the surface of the sleeve turned white, and there were unevenly distributed tactile scratches on the surface.

[0160] A small amount of circumferential and axial scratches appeared on the sleeve surface of Comparative Example 2, of which the circumferential scratches were mostly regular scratches and the axial scratches were mostly irregular scratches. The axial scratches were mainly caused by the lateral movement of the metal pipe during the transmission process, and the axial scratches were mainly caused by metal particle impurities adhering to the sleeve surface and being squeezed against each other when the metal pipe passed through. At the same time, the sleeve surface also appeared slightly white.

[0161] The sleeve surface of Example 3 has no obvious defects, but the pit structure contains a small amount of impurities. Since the sleeve surface only has the pit structure but no chip groove, on the one hand, the pit structure has a good dispersion effect on the lubricating oil, and on the other hand, the pit structure can collect the metal particle impurities brought by the metal pipe fittings, but since there is no chip groove, they cannot be discharged. Therefore, no obvious wear and whitening is observed on the surface of the sleeve of Example 3 after long-term work, but the metal particle impurities remaining in the pit structure will cause scratches on the surface of the metal pipe fittings, affecting product quality.

[0162] The sleeve surface of Comparative Example 4 has slight scratches. Since the sleeve surface only has chip grooves but no pit structure, under the action of the chip grooves, the lubricating oil can discharge the metal particle impurities that fall into the chip grooves.

[0163] In combination with Example 1, Example 2 and Comparative Examples 1-4, it can be seen that the sleeve designed within the numerical range of the design formula given in the present invention, the composite structure formed by the pit structure of the sleeve and the chip groove is not only conducive to improving the lubrication effect of the sleeve, but also can collect and discharge impurities fallen from the metal pipe fittings, thereby preventing the impurities from sticking to the surface of the sleeve. In the process of long-term straightening of the metal pipe fittings, the metal pipe fittings squeeze the impurities with the sleeve surface, causing the sleeve surface to dent, reducing the flatness of the sleeve surface, and further affecting the surface quality of the product.

[0164] Combining Example 1, Example 2 and Comparative Example 3, it can be seen that the chip groove of the present invention is conducive to evenly distributing the lubricating oil on the contact surface between the sleeve and the metal pipe fitting, improving the lubrication effect of the sleeve and avoiding scratches on the surface of the sleeve and the metal pipe fitting.

[0165] It can be seen from Example 1, Example 2 and Comparative Example 4 that the pit structure of the present invention is conducive to collecting impurities on the surface of the metal pipe fitting, thereby preventing the impurities from affecting the surface quality of the sleeve and the metal pipe fitting.

[0166] Further combined with Comparative Examples 3 and 4, it can be seen that the impurities collected by the pit structure of the present invention can be discharged through the chip groove along with the flow of lubricating oil, thereby avoiding the impurities collected by the pit structure from being deposited on the surface of the sleeve and extending the service life of the sleeve.

[0167] Combining Comparative Example 1 and Example 1, Example 2, Example 3 and Comparative Examples 2-4, it can be known that whether the peripheral wall of the sleeve is coated with a wear-resistant layer has an important influence on the surface strength of the sleeve. On the sleeves of Example 1, Example 2 and Comparative Examples 2-4, a wear-resistant layer is coated, and the surface hardness of the sleeve can reach HV1200, while the surface hardness of the sleeve in Comparative Example 1 that is not coated with a wear-resistant layer is only HV800.

[0168] In a fourth aspect, the present invention further provides a straightening machine, comprising: the above-mentioned sleeve 100, or the above-mentioned roller 200, or the sleeve 100 manufactured by the above-mentioned sleeve processing method.

[0169] The structural design of the pit structure 110 and the spiral chip groove 120 of the straightening machine of the present invention is conducive to evenly distributing the lubricating oil in the contact area between the roller 200 and the metal pipe, improving the contact quality between the roller 200 and the metal pipe, thereby extending the service life of the straightening machine. At the same time, impurities such as burrs dropped from the metal pipe can be collected by the pit structure 110 and discharged through the chip groove 120, which is conducive to improving product quality.

[0170] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The description and examples are to be considered exemplary only, and the true scope and spirit of the present invention is indicated by the following claims.

[0171] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A sleeve (100) applied to a roller (200) of a straightening machine, characterized in that: A plurality of concave structures (110) are provided on the peripheral wall of the sleeve (100), and a chip removal groove (120) extending spirally around the axis of the sleeve (100) is also provided on the peripheral wall of the sleeve (100), and the chip removal groove (120) extends through and connects at least part of the plurality of concave structures (110).

2. The sleeve (100) according to claim 1, characterized in that: The depth H1 of the pit structure (110) satisfies: and / or, The opening width D1 of the pit structure (110) satisfies: and / or, The depth H2 of the chip removal groove (120) satisfies: and / or, The width D2 of the chip removal groove (120) satisfies: and / or, The pitch P of the chip removal groove (120) satisfies: ; wherein d is the diameter of the sleeve (100), L is the length of the sleeve (100), m is the thickness of the sleeve (100), p is the first calculation coefficient, q is the second calculation coefficient, r is the third calculation coefficient, s is the fourth calculation coefficient, and t is the fifth calculation coefficient, The first calculation coefficient p satisfies: and / or, The second calculation coefficient q satisfies: and / or, The third calculation coefficient r satisfies: and / or, The fourth calculation coefficient s satisfies: and / or, The fifth calculation coefficient t satisfies: .

3. The sleeve (100) according to claim 2, characterized in that: The plurality of dimple structures (110) are distributed at intervals along the circumference and / or axial direction of the sleeve (100); the plurality of dimple structures (110) are divided into a plurality of groups distributed at intervals along the circumference of the sleeve (100), and each group includes a plurality of dimple structures (110) distributed at intervals along the axial direction of the sleeve (100).

4. The sleeve (100) according to claim 2, characterized in that: The total area of ​​the pit structure (110) overlapping the chip groove (120) is 35%-45% of the total area of ​​all the pit structures (110).

5. The sleeve (100) according to claim 2, characterized in that: The opening width D1 of the pit structure (110) satisfies: and / or, The depth H1 of the pit structure (110) satisfies: and / or, The distance between two adjacent pit structures (110) along the circumferential direction of the sleeve (100) is 100 μm-120 μm; and / or, The distance between two adjacent pit structures (110) along the axial direction of the sleeve (100) is 100 μm-120 μm.

6. The sleeve (100) according to claim 2, characterized in that The sleeve (100) has a processing area (130) on its peripheral wall, the pit structures (110) are all located in the processing area (130), and the processing area (130) has an axial width of 30 mm to 40 mm along the sleeve (100); and / or, The processing area (130) has a circumferential length of 141 mm to 142 mm along the sleeve (100); and / or, The area of ​​the processing zone (130) is 65%-75% of the area of ​​the peripheral wall of the sleeve (100).

7. The sleeve (100) according to claim 2, characterized in that The width D2 of the chip removal groove (120) satisfies: and / or, The depth H2 of the chip removal groove (120) satisfies: and / or, The helix angle β of the chip removal groove (120) satisfies: and / or, The pitch of the chip removal groove (120) is 2 mm-3 mm.

8. The sleeve (100) according to claim 1, characterized in that The outer wall of the sleeve (100) is provided with a wear-resistant layer; and / or the thickness of the wear-resistant layer is 15 μm-30 μm; Wherein, the pit structure (110) and the chip removal groove (120) are arranged on the wear-resistant layer.

9. The sleeve (100) according to any one of claims 1 to 8, characterized in that: The roughness Ra of the peripheral wall of the sleeve (100) satisfies: .

10. A roller (200), used in a straightening machine, characterized in that: include: Mandrel (210); There is at least one rotating frame (220), the rotating frame (220) comprising a retaining frame (221) and a needle roller (222), the retaining frame (221) being sleeved on the outer circumference of the core shaft (210), and the needle roller (222) being arranged on the retaining frame (221) and in rolling contact with the core shaft (210); A bearing outer ring (230) is sleeved on the outside of the rotating frame (220) and is in contact with the needle roller (222); The sleeve (100) according to any one of claims 1 to 9, wherein the sleeve (100) is sleeved on the outer side of the bearing outer ring (230) and has an interference fit with the bearing outer ring (230); A washer (240) is sleeved on the outer circumference of the core shaft (210) and is sealed at one end of the bearing outer ring (230) along the axial direction of the sleeve (100); The limiting ring (250) is sleeved on the outer circumference of the core shaft (210) and is located on a side of the washer (240) facing away from the bearing outer ring (230).

11. A sleeve processing method, used for processing the sleeve (100) according to any one of claims 1 to 9, characterized in that: The processing method comprises the following steps: Processing a concave structure (110) on a cylindrical member to obtain a primary processed member; Processing a chip removal groove (120) on the primary machined part to obtain a secondary machined part, namely the sleeve (100); The step of machining the pit structure (110) on the cylinder member comprises: Positioning and calibrating the cylinder member; According to first processing parameters, the laser device is controlled to rotate around the circumference of the barrel part, and a plurality of pit structures (110) are scanned and processed on the circumferential wall of the barrel part, wherein the first processing parameters include: an opening width D1 of the pit structure (110), a depth H1 of the pit structure (110), a spacing distance of the pit structure (110) along the circumference of the barrel part, a spacing distance of the pit structure (110) along the axial direction of the barrel part, a width of a processing area (130), and a length of the processing area (130); the step of processing a chip removal groove (120) on the primary processing part includes: Positioning and calibrating the primary workpiece; The laser device is controlled to be fixed, and according to a second processing parameter, the axial movement of the primary processing part is controlled, and the rotation of the primary processing part is controlled, so as to scan and process the chip groove (120) on the peripheral wall of the primary processing part, wherein the second processing parameter includes: a width D2 of the chip groove (120), a depth H2 of the chip groove (120), a pitch of the chip groove (120), and a helix angle β of the chip groove (120).

12. A straightening machine, characterized in that: include: The sleeve (100) according to any one of claims 1 to 9, or the roller (200) according to claim 10, or the sleeve (100) manufactured by the sleeve processing method according to claim 11.

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