Squeegee roll and method of making same

Abstract

The present application relates to a kind of wringing rollers and its manufacturing method, and the wringing roller includes mandrel, roller sleeve and a pair of end fixing assemblies.Two end fixing assemblies are fixed at the both ends of mandrel correspondingly, and can press roller sleeve tightly along the axial direction.Roller sleeve is sleeve body formed by the compression of multiple non-woven fabric rings stacked on mandrel.The cooperation between non-woven fabric ring and mandrel is interference fit or transition fit.In the manufacturing method of wringing roller, the cut non-woven fabric ring is threaded on mandrel one by one, and the non-woven fabric ring is compressed into a whole by oil press at both ends of the axial direction to form roller sleeve.In the wringing roller involved in the present patent, the roller sleeve body has high density, porous structure beneficial to absorbing a large amount of liquid and air, and higher friction coefficient, which can play a high-efficiency wringing effect in the plate cleaning extrusion process, realize reliable control on the oil film thickness remaining on the plate, and can be stably maintained under the condition meeting the use requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal plate cleaning equipment, in particular to a wringing roller on a cleaning machine. BACKGROUND

[0002] The current cleaning of the plate is mostly completed by a plate cleaning machine on the automobile stamping production line and the steel plate uncoiling line. The roller set of the cleaning machine generally includes a pair of leading rollers, a pair of cleaning rollers and two pairs of wringing rollers. The wringing roller is used to wring the surface of the steel plate after the cleaning operation is completed by the cleaning roller.

[0003] The wringing roller includes a shaft, a roller sleeve fixed on the shaft and end fixing assemblies fixed at both ends of the shaft to press the roller sleeve in the axial direction. As shown in Figure 1 The wringing rollers 200 and 300 are used in pairs and are divided into driving rollers and driven rollers, and the rotation directions of the two are opposite. The upper and lower end surfaces of the plate 100 are in contact with the roller sleeves of the driving and driven wringing rollers. Moreover, the continuous rolling of the wringing rollers 200 and 300 will exert a certain pressure on the roller sleeves, so that the surface of the roller sleeve is in close contact with the metal plate and has a certain deformation amount. The liquid 400 / oil on the surface of the plate 100 will be absorbed into the roller sleeve on the side of the roller sleeve surface away from the plate 100 / strip surface due to the negative pressure generated by the recovery of the roller sleeve surface shape caused by the release of pressure under the continuous pressure and the continuous rolling action of the wringing rollers 200 and 300, so that this side becomes the absorption side, achieving the purpose of further removing the liquid on the surface of the plate 100 / strip; at the same time, the residual liquid absorbed will be squeezed out in the roller sleeve surface on the side close to the plate 100 / strip surface under the pressure, so that this side becomes the discharge side, and the process is repeated.

[0004] The existing wringing roller has poor control of the thickness of the oil film remaining on the plate during the wringing process because the roller sleeve is relatively soft. After being used for a period of time, the overall hardness of the roller sleeve will further decrease, which may cause the thickness of the oil film remaining on the plate to fail to meet the use requirements, and the wringing roller needs to be replaced relatively frequently. SUMMARY

[0005] In view of the problem that the existing squeeze roller cannot well and stably control the oil film thickness remaining on the plate surface, the application provides a squeeze roller and a manufacturing method thereof.The roller sleeve of the squeeze roller is compressed by non-woven fabric accumulation, so that the roller sleeve body has greater hardness, and the efficient and controllable squeeze effect of liquid during absorption and discharge is realized, the reliable control of the oil film thickness remaining on the plate is realized, and the oil film thickness can stably meet the use requirements.The manufacturing method of the squeeze roller can make the manufactured squeeze roller have higher friction coefficient, high squeeze performance, repeated elasticity and wear resistance, which helps to realize the efficient and controllable squeeze effect of the liquid attached to the plate during absorption and discharge, improve the controllability of the oil film thickness remaining on the plate, and stably keep the oil film thickness under the condition of meeting the use requirements.

[0006] The technical solution adopted by the application to solve the technical problems is: a squeeze roller, comprising a mandrel, a roller sleeve sleeved on the mandrel, and a pair of end fixing assemblies. The two end fixing assemblies are fixed on the two ends of the mandrel correspondingly, can press the roller sleeve tightly in the middle along the axial direction, and can be stably fixed on the mandrel.

[0007] The roller sleeve is a sleeve body formed by compressing a plurality of non-woven fabric rings on the mandrel in a stacked manner.

[0008] The inner diameter of the non-woven fabric ring is consistent with the outer diameter of a section of the mandrel for bearing the roller sleeve. The cooperation between the non-woven fabric ring and the mandrel can be interference fit, or the cooperation between the non-woven fabric ring and the mandrel can be transition fit.

[0009] Optionally, the non-woven fabric ring comprises a first non-woven fabric ring and a second non-woven fabric ring, and the outer diameter of the first non-woven fabric ring is greater than the outer diameter of the second non-woven fabric ring. Preferably, the ratio of the outer diameter of the second non-woven fabric ring to the outer diameter of the first non-woven fabric ring is within the interval of 1 / 3 to 2 / 3.

[0010] The first non-woven fabric ring and the second non-woven fabric ring are alternately sleeved on the mandrel and compressed in a stacked manner to form a sleeve body.

[0011] The alternating sleeving between the first non-woven fabric ring and the second non-woven fabric ring can be understood as that one piece of the first non-woven fabric ring is sleeved on the mandrel, and one piece of the second non-woven fabric ring is correspondingly sleeved on the mandrel; or that multiple pieces of the first non-woven fabric ring are sleeved on the mandrel, and one piece of the second non-woven fabric ring is correspondingly sleeved on the mandrel; or that one piece of the first non-woven fabric ring is sleeved on the mandrel at the middle position of the mandrel, and one piece of the second non-woven fabric ring is correspondingly sleeved on the mandrel, and multiple pieces of the first non-woven fabric ring are sleeved on the mandrel at the positions close to the two ends of the mandrel, and one piece of the second non-woven fabric ring is correspondingly sleeved on the mandrel, and so on. Therefore, the understanding of the alternating sleeving of the first non-woven fabric ring and the second non-woven fabric ring on the mandrel should not be limited to the above example.

[0012] Optionally, the non-woven fabric ring further comprises a third non-woven fabric ring, and the outer diameter of the third non-woven fabric ring is smaller than the outer diameter of the second non-woven fabric ring. Preferably, the ratio between the outer diameter of the third non-woven fabric ring and the outer diameter of the second non-woven fabric ring is 2 / 3 to 5 / 6.

[0013] The first non-woven fabric ring and the second non-woven fabric ring are alternately sleeved at the middle of the mandrel; or the third non-woven fabric ring and the first non-woven fabric ring are alternately sleeved at the two ends of the mandrel, or the third non-woven fabric ring, the second non-woven fabric ring and the first non-woven fabric ring are cyclically and alternately sleeved at the two ends of the mandrel.

[0014] Optionally, the mandrel is forged from 42CrMo steel.

[0015] The manufacturing method of the wringing roller related to the above-mentioned structure of the wringing roller comprises the following steps:

[0016] (1) Machining and heat treatment of the mandrel

[0017] Place the forged blank of 42CrMo material on the lathe, and obtain the mandrel blank through rough machining;

[0018] Perform quenching and tempering treatment on the mandrel blank, so that the hardness of each part after quenching and tempering reaches 250GB-280HB;

[0019] After finishing machining of the mandrel blank, the mandrel is obtained, and the roughness of the mandrel is less than 1.6μm, and the runout is less than 0.02mm;

[0020] Perform induction quenching treatment on the part of the mandrel matched with the bearing;

[0021] (2) Cutting non-woven fabric ring

[0022] According to the outer diameter size of the mandrel, the non-woven fabric ring is obtained by the perforation cutting method from the non-woven fabric cloth;

[0023] (3) The non-woven fabric ring is sleeved on the mandrel in layers

[0024] After the plurality of non-woven fabric rings are sequentially sleeved on the mandrel, the oil press is used to compress and fix the two ends of the stacked non-woven fabric rings in the axial direction, the holding time is 20-40 minutes, the roll sleeve surface reaches the Shore hardness range of 90-95;

[0025] (4) Machining the roll sleeve

[0026] The turning machining of the roll sleeve makes the outer diameter size of the roll sleeve reach the design size requirement, and the surface roughness reaches 0.8;

[0027] (5) Dynamic balance treatment

[0028] The extrusion roller is placed on the dynamic balance measuring machine for testing, and the corresponding dynamic balance treatment measures are taken to adjust the roll sleeve according to the test situation.

[0029] Optionally, in step (2), two non-woven fabric rings with different outer diameters are obtained by the perforation cutting method, which are distinguished as the first non-woven fabric ring and the second non-woven fabric ring, and the outer diameter of the second non-woven fabric ring is smaller than that of the first non-woven fabric ring;

[0030] In step (3), the first non-woven fabric ring and the second non-woven fabric ring are alternately sleeved on the mandrel, and then the oil press is used to compress and fix the two ends of the stacked non-woven fabric rings in the axial direction;

[0031] In step (4), after the turning machining of the roll sleeve, the first non-woven fabric ring has a certain radial thickness in the radial direction of the roll sleeve, so the difference between the outer diameter size of the first non-woven fabric ring and the outer diameter size of the second non-woven fabric ring needs to be reasonably controlled.

[0032] Optionally, in step (3), at least one of the two pressing dies of the oil press has an annular boss protruding outward in the axial direction on the working surface;

[0033] The inner diameter size of the annular boss is consistent with the inner diameter size of the shaft hole on the pressing die, and the inner wall of the annular boss extends in the wall extension direction of the shaft hole of the pressing die; the outer diameter of the annular boss is smaller than the outer diameter of the first non-woven fabric ring, but not smaller than the outer diameter of the second non-woven fabric ring.

[0034] The roll sleeve is formed by stacking a plurality of first non-woven fabric rings and a plurality of second non-woven fabric rings on a mandrel alternately, the overall thickness of the inner ring (formed by stacking the first non-woven fabric rings and the second non-woven fabric rings) is greater than the overall thickness of the outer ring (formed by stacking only the first non-woven fabric rings), the annular bosses are formed on the dies corresponding to the two ends of the roll sleeve, which helps to ensure that the two ends of the roll sleeve are planar or close to planar after being compressed and fixed and shaped, and the density of the outer ring reaches the required value.

[0035] Optionally, the dies of the oil press used in step (3) include an inner die sleeve and an outer die sleeve.

[0036] An axial hole is formed on the inner die sleeve along the axial line of the inner die sleeve, and the two ends of the mandrel can extend into the inner die sleeve.

[0037] A cylindrical section and a conical section are sequentially formed on the outer wall of the inner die sleeve along the axial direction inwardly from the working end face, a plurality of radial flanges are formed around the circumference and are distributed alternately near the other end of the conical section, and the small-diameter end of the conical section is connected to the cylindrical section.

[0038] A cylindrical wall and a conical wall are sequentially formed on the inner wall of the axial hole of the outer die sleeve along the axial direction inwardly from the working end face, a plurality of tracks are formed around the circumference and are distributed alternately near the other end of the conical wall, the tracks extend along the axial direction, and the flared end of the conical wall is connected to the cylindrical wall.

[0039] The inner die sleeve can be inserted into the axial hole of the outer die sleeve, and the radial flanges can be matched with the tracks one by one, so that the inner die sleeve can move linearly along the axial direction relative to the outer die sleeve.

[0040] When the radial flanges move to the inner end of the tracks, the radial flanges can be in contact with the end face of the conical wall, so that the working end face of the inner die sleeve and the working end face of the outer die sleeve are kept in the same vertical plane, and the relative surfaces between the conical section and the conical wall can be in contact or have a local radial gap.

[0041] When the radial flanges move towards the outer end of the tracks, the working end face of the inner die sleeve can be retracted into the axial hole of the outer die sleeve.

[0042] The outer diameter of the cylindrical section is consistent with the inner diameter of the cylindrical wall, and the outer diameter of the cylindrical section is not greater than the outer diameter of the second non-woven fabric ring.

[0043] Similarly, the roller sleeve, which is formed by stacking multiple first nonwoven fabric rings and multiple second nonwoven fabric rings alternately threaded on the mandrel, has an inner (axial) overall thickness that is greater than that of the outer (axial) overall thickness. Correspondingly, the pressing molds at both ends of the roller sleeve are composed of an inner mold sleeve and an outer mold sleeve. The working end face of the pressing mold can be adjusted so that the inner mold sleeve and the outer mold sleeve can simultaneously apply a pressing and compacting effect to both ends of the entire roller sleeve, or the outer mold sleeve can apply a pressing and compacting effect to the outer ring of the roller sleeve alone. This helps to better ensure that after the two ends of the roller sleeve are compressed, fixed and shaped, the two end faces of the final roller sleeve are flat or nearly flat. Moreover, it is easier and more flexible to control the density of the outer ring to achieve the best requirements. The design of the pressing mold here helps to improve the operability and controllability of the roller sleeve forming / shaping process.

[0044] In specific operation, firstly, a hydraulic press can be used to drive the working end face of the inner mold sleeve and the working end face of the outer mold sleeve onto the same vertical plane, and then the two ends of the stacked nonwoven fabric ring along the axial direction can be compressed and fixed, with a pressure holding time of 10 to 20 minutes; then, a hydraulic press can be used to drive the two outer mold sleeves closer to each other to further compress and fix the two ends of the stacked nonwoven fabric ring along the axial direction, with a pressure holding time of 10 to 20 minutes; finally, a hydraulic press can be used again to drive the working end face of the inner mold sleeve and the working end face of the outer mold sleeve onto the same vertical plane, and then the two ends of the stacked nonwoven fabric ring along the axial direction can be compressed and fixed again, with a pressure holding time of 20 to 30 minutes.

[0045] The inner mold sleeve and the outer mold sleeve can be driven independently, and can work simultaneously or independently.

[0046] The beneficial effects of this invention are as follows: Under this patented solution, the roller sleeve is made by plying and compressing nonwoven fabric, resulting in a roller sleeve body with good high density. Combined with the nonwoven fabric's porous structure, formed by interlaced fibers, which allows for the absorption of large amounts of liquid and air, and its relatively high coefficient of friction, the extrusion roller under this patent can achieve highly efficient squeezing during the absorption and discharge of liquid during the board cleaning and extrusion process. It improves the control over the thickness of the oil film remaining on the board during squeezing, maintaining it under conditions that meet usage requirements, and ensuring high-speed operation without slippage. In summary, the extrusion roller under this patented solution has both a high density ratio and good absorption and discharge performance. After prolonged exposure to cyclic extrusion pressure, the radial deformation of the roller sleeve is not significant, and the overall density ratio decreases slowly. This improves the long-term reliable control of the thickness of the residual oil film on the board, allowing the squeezing roller to maintain its performance under conditions that meet usage requirements for an extended period, thus significantly extending its service life. Attached Figure Description

[0047] Figure 1 A schematic diagram of the working state of the squeeze roller on the steel plate cleaning machine.

[0048] Figure 2 A structural schematic diagram of the squeeze roller of the first embodiment of the present patent.

[0049] Figure 3 A structural schematic diagram of the squeeze roller of the second embodiment of the present patent (in the manufacturing state).

[0050] Figure 4 A manufacturing process schematic diagram of the squeeze roller (the first embodiment) of the present patent.

[0051] Figure 5 A structural schematic diagram of the special mold implementation mode one in the manufacturing process of the squeeze roller (the second embodiment) of the present patent.

[0052] Figure 6 A structural schematic diagram of the special mold implementation mode two in the manufacturing process of the squeeze roller (the second embodiment) of the present patent.

[0053] Figure 7 A structural schematic diagram of the mold implementation mode two (the state of the outer mold sleeve extending along the axial direction relative to the inner mold sleeve).

[0054] Figure 8 A schematic diagram of the stress / pressure state for calculating the deflection in the running state of the squeeze roller.

[0055] Figure 9 A schematic diagram of the micro-enlarged structure of the non-woven fabric.

[0056] In the figure: 100, plate; 200, 300, squeeze roller; 400, liquid; 500, non-woven fabric;

[0057] 10, shaft; 11, bearing; 20, roller sleeve; 21, non-woven fabric ring; 21a, first non-woven fabric ring; 21b, second non-woven fabric ring; 30, end fixed assembly;

[0058] 40, first mold; 50, second mold; 51, annular boss; 52, annular flange; 60, third mold; 61, inner mold sleeve; 611, cylindrical section; 612, conical section; 613, radial flange; 62, outer mold sleeve; 621, cylindrical wall; 622, conical wall; 623, track;

[0059] R1, inner sleeve ring; R2, outer sleeve ring. DETAILED DESCRIPTION

[0060] The structure, proportion, size, etc. shown in the drawings of the specification are only used to cooperate with the content disclosed in the specification, to be understood and read by those skilled in the art, and do not have technical significance to limit the conditions that the application can be implemented. Any modification of the structure, change of the proportion relationship, or adjustment of the size, without affecting the effects and purposes that the application can produce, should still fall within the scope of the technology disclosed by the application. At the same time, the terms such as "upper", "lower", "front", "rear", "middle" and the like in the specification are only for the convenience of clear description, and are not used to limit the scope of the application. The change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the scope of the application.

[0061] As shown in Figures 2-3 , Figures 5-6 , the wringing roller includes a mandrel 10, a roller sleeve 20 sleeved on the mandrel 10, and a pair of end fixing assemblies 30. As in the prior art, the two end fixing assemblies 30 are fixed at the two ends of the mandrel 10 correspondingly, can press the roller sleeve 20 between them in the axial direction, and can be firmly fixed on the mandrel 10.

[0062] Example one

[0063] As shown in Figure 2 , the roller sleeve 20 is a sleeve body formed by laminated compression of a plurality of non-woven fabric rings 21 laminated on the mandrel.

[0064] The inner diameter of the non-woven fabric ring 21 is consistent with the outer diameter of a section of the mandrel 10 at the middle part for bearing the roller sleeve 20. The fit between the non-woven fabric ring 21 and the mandrel 10 can be an interference fit, or the fit between the non-woven fabric ring 21 and the mandrel 10 can be a transition fit.

[0065] The outer diameter of the non-woven fabric ring 21 is substantially uniform.

[0066] Generally, the roller cover of the wringing roller 200, 300 is relatively soft, and it is relatively easy to produce a large deformation, which is beneficial to the absorption of liquid. However, if the overall density of the wringing roller is relatively small (the roller cover is relatively soft), the contact deformation of the roller cover is large, which can significantly reduce the rotation torque provided by the wringing roller, reduce the pressing force applied to the plate, and easily cause idling. If the roller cover of the wringing roller is too hard, the wringing effect is very poor, the liquid removal effect is reduced, and a larger downward pressure needs to be applied to the wringing roller to achieve the required contact surface deformation, which can increase the production energy consumption cost and cause serious wear of the roller cover, thereby significantly increasing the use cost. In the past, the hardness of the roller cover was reduced to ensure good absorption and oil removal effect, but the thickness of the oil layer remaining on the plate after a long time of use was unstable and different at different positions, which could not meet the use requirements.

[0067] In this embodiment, the roller cover 20 is made of non-woven fabric by lamination and compression, so that the roller cover body has good high density. The non-woven fabric is formed by interlacing fibers, and has a gap porous structure (see FIG. 1) between the fibers, which can absorb a large amount of liquid and air. In addition, the non-woven fabric has a relatively high friction coefficient, so that the wringing roller in this patent can achieve high-efficiency wringing effect during the absorption and discharge of the cleaning oil (liquid 100) during the plate cleaning and wringing process, and can control the thickness of the oil film remaining on the plate during the wringing process, and can prevent slipping during high-speed operation. Figure 9 Figure 1 In this embodiment, the roller cover 20 is made of non-woven fabric by lamination and compression, so that the roller cover body has good high density. The non-woven fabric is formed by interlacing fibers, and has a gap porous structure (see FIG. 1) between the fibers, which can absorb a large amount of liquid and air. In addition, the non-woven fabric has a relatively high friction coefficient, so that the wringing roller in this patent can achieve high-efficiency wringing effect during the absorption and discharge of the cleaning oil (liquid 100) during the plate cleaning and wringing process, and can control the thickness of the oil film remaining on the plate during the wringing process, and can prevent slipping during high-speed operation.

[0068] In summary, the wringing roller in this patent scheme can have a large density ratio and good absorption and discharge performance. After the roller cover is subjected to cyclic wringing pressure for a long time, the deformation of the roller cover along the radial direction is not significant, the overall density ratio decays slowly, and the thickness of the oil film remaining on the plate can be reliably and effectively controlled for a long time.

[0069] The cooperation between the non-woven fabric ring 21 and the mandrel 10 is an interference fit or a transition fit, which can form a tight and firm contact between the finally shaped roller cover 20 and the mandrel 10 (combined to form a torque transmission key), which can effectively transmit torque. When the mandrel is driven to rotate, the roller cover 20 can be synchronously and stably rotated, and the wringing force can be effectively transmitted to the plate 100, which can effectively prevent the roller cover from jumping, idling and other problems.

[0070] Example Two

[0071] ​In this embodiment, the non-woven fabric ring 21 comprises a first non-woven fabric ring 21a and a second non-woven fabric ring 21b, and the outer diameter of the first non-woven fabric ring 21a is larger than that of the second non-woven fabric ring 21b. Meanwhile, the following specific design is made:

[0072] The outer diameter of the second non-woven fabric ring 21b can be 1 / 3 or 1 / 2 of that of the first non-woven fabric ring 21a, which should be determined according to the outer diameter of the squeezing roller 200, 300 to be designed. If the outer diameter is large, 1 / 2 ratio is selected, otherwise 1 / 3 ratio is selected.

[0073] The first non-woven fabric ring 21a and the second non-woven fabric ring 21b are alternately sleeved on the mandrel 10 and are laminated and compressed to form a sleeve body.

[0074] The above-mentioned "the first non-woven fabric ring 21a and the second non-woven fabric ring 21b are alternately sleeved on the mandrel 10" can be understood as that one piece of the first non-woven fabric ring 21a is sleeved on the mandrel 10, and one piece of the second non-woven fabric ring 21b is correspondingly sleeved on the mandrel 10, as shown in Figure 3 , and can also be understood as that two pieces of the first non-woven fabric ring 21a are sleeved on the mandrel 10, and one piece of the second non-woven fabric ring 21b is correspondingly sleeved on the mandrel 10, as shown in Figure 5 , Figure 6 , and further, one piece of the first non-woven fabric ring can be sleeved on the mandrel at the middle position of the mandrel, and one piece of the second non-woven fabric ring is correspondingly sleeved on the mandrel, and one piece of the second non-woven fabric ring is correspondingly sleeved on the mandrel after multiple pieces of the first non-woven fabric ring are sleeved on the mandrel at positions close to both ends of the mandrel, and so on.

[0075] Therefore, the understanding of the alternately sleeving of the first non-woven fabric ring 21a and the second non-woven fabric ring 21b on the mandrel 10 should not be limited to the above-mentioned example.

[0076] As shown in Figure 5As shown, the roller sleeve 20 in the embodiment can be divided into two layers in the radial direction, i.e. an inner ring R1 and an outer ring R2. The inner ring R1 is in direct contact with the outer wall of the mandrel 10, and the density of the inner ring R1 is greater than that of the outer ring R2. Therefore, the hardness of the inner ring of the roller sleeve 20 is greater than that of the outer ring. This not only helps to further improve the tightness, firmness and stability of the combination between the mandrel 10 and the roller sleeve 20, and improves the ability of the key to transmit torque (the stability of torque transmission is better), but also helps to transmit the extrusion pressure and improve the ability to control the residual oil film on the plate, achieving better results. Even after a long period of use, the control ability can still stably maintain the control ability of the residual oil film on the plate, so as to meet the use requirements.

[0077] In addition, in order to further improve the characteristics of the extrusion roller in transmitting the extrusion pressure, the stability and reliability of transmitting the torque, the non-woven fabric ring 21 can further include a third non-woven fabric ring (not shown in the related embodiments), and the outer diameter of the third non-woven fabric ring is smaller than that of the second non-woven fabric ring. Preferably, the ratio between the outer diameter of the third non-woven fabric ring and the outer diameter of the second non-woven fabric ring is in the range of 2 / 3 to 5 / 6.

[0078] The first non-woven fabric ring and the second non-woven fabric ring are alternately sleeved on the middle part of the mandrel, and the axial length on the mandrel is not more than 2 / 3, and is preferably controlled to about 1 / 2. Meanwhile, the third non-woven fabric ring and the first non-woven fabric ring are alternately sleeved on the two end sides of the mandrel, or the third non-woven fabric ring, the second non-woven fabric ring and the first non-woven fabric ring are cyclically and alternately sleeved on the two end sides of the mandrel.

[0079] In the above embodiment, the density / hardness of the roller sleeve 20 formed on the extrusion roller 200, 300 is not completely uniform. Specifically, in the radial direction, the average density / hardness of the roller sleeve 20 (inner ring) close to the outer wall of the mandrel 10 is greater than that of the roller sleeve 20 (outer ring) close to the outer wall of the roller sleeve 20. In the axial direction, the density / hardness (average value) of the roller sleeve 20 (inner ring) close to the outer wall of the mandrel 10 from both ends to the middle is decreasingly changed. This helps to make the pressure P (see, for example, Fig. 2) acting on the two ends of the extrusion roller 200, 300 (or the mandrel 10) more evenly distributed to the entire roller surface, so that the extrusion pressure of the roller surface on the plate is relatively more uniform, which is beneficial to better ensure the uniformity and consistency of the residual oil layer thickness on the plate. Figure 8 ) more evenly distributed to the entire roller surface, so that the extrusion pressure of the roller surface on the plate is relatively more uniform, which is beneficial to better ensure the uniformity and consistency of the residual oil layer thickness on the plate.

[0080] The mandrel 10 is generally made of 42CrMo alloy structural steel, which has high strength and toughness, good hardenability, no obvious temper brittleness, high fatigue limit and anti-multiple impact ability after quenching and tempering, and good low-temperature impact toughness.

[0081] AsFigure 4 The method for manufacturing the wringing roller related to the wringing roller involved in the present patent comprises the following steps:

[0082] (1) machining and heat treatment of the mandrel, Figure 4 (1) in the above:

[0083] Put the forged blank of 42CrMo material on the lathe, and get the mandrel blank (leave allowance for finishing) through rough machining;

[0084] Carry out quenching and tempering treatment on the mandrel blank, so that the hardness of each part after quenching and tempering reaches the range of 250GB-280HB;

[0085] The rough machined mandrel blank can be preheated to 500 degrees Celsius in a heating furnace for more than 60 minutes, and then heated to 850-880 degrees Celsius. During the heating process, the mandrel blank (rotates) should be slowly heated to be uniformly heated, and excessive heating and rapid cooling should be avoided;

[0086] The furnace holding time is 100 minutes, the tempering temperature is set to 615 degrees Celsius, the holding time is 150 minutes, and after the holding time ends, the furnace is discharged and oil-cooled to room temperature;

[0087] After finishing the mandrel blank, the mandrel with the size meeting the design requirements is obtained, and the roughness of the mandrel is less than 1.6μm, and the runout is less than 0.02mm;

[0088] Induction quenching treatment is carried out on the part of the mandrel 10 matched with the bearing;

[0089] (2) cutting the non-woven fabric ring, Figure 4 (1) in the above:

[0090] According to the outer diameter size of the mandrel 10, the non-woven fabric ring 21 is prepared by cutting the non-woven fabric 500 through the perforation cutting method;

[0091] (3) stacking the non-woven fabric rings on the mandrel, Figure 4 (2)-(3) in the above:

[0092] After the multiple non-woven fabric rings are worn on the mandrel one by one, the oil press is used to compress and fix the two ends of the stacked non-woven fabric rings in the axial direction, the pressure of the pressing mold on the oil press acting on the two ends of the non-woven fabric is as shown in F1 and F2, the pressure holding time is 30 minutes, and the surface hardness of the roller cover is in the range of 90-95 shore (several points are uniformly taken on the entire roller cover to test the hardness, and the surface hardness is ensured to be within 90-95 shore);

[0093] (4) machining the roller cover, Figure 4 (4)-(5) in the above:

[0094] The turning machining of the roller sleeve makes the outer diameter of the roller sleeve reach the design size requirement, and the surface roughness reaches 0.8;

[0095] (5) Dynamic balance processing:

[0096] The extrusion roller is placed on a dynamic balance measuring machine for testing, and corresponding dynamic balance processing measures are taken to adjust the roller sleeve according to the test situation.

[0097] The machining and heat treatment of the mandrel and the dynamic balance processing of the extrusion roller can be performed according to the prior art, and will not be described in detail.

[0098] As shown in Figure 5 , Figure 6 , in step (2), two non-woven fabric rings 21 with different outer diameters (for being worn on the mandrel 10) are prepared by using a punching cutting method, and are distinguished as a first non-woven fabric ring 21a and a second non-woven fabric ring 21b, and the outer diameter of the second non-woven fabric ring 21b is smaller than that of the first non-woven fabric ring 21a.

[0099] In step (3), the first non-woven fabric ring 21a and the second non-woven fabric ring 21b are alternately worn on the mandrel 10, and then an oil press is used to compress and fix the two ends of the stacked non-woven fabric rings in the axial direction.

[0100] As shown in Figure 5 , the first pressing die 40 and the second pressing die 50 shown are two pressing dies installed on the oil press.

[0101] In step (4), after the turning machining of the roller sleeve 20, the first non-woven fabric ring should have a certain radial thickness (about 1 / 5-1 / 3 of the radial thickness of the roller sleeve 20) in the radial direction of the roller sleeve, so the difference between the outer diameter of the first non-woven fabric ring and the outer diameter of the second non-woven fabric ring should be reasonably controlled.

[0102] As shown in Figure 5 , among the two pressing dies of the oil press used in step (3), the working surface of the second pressing die 50 is formed with an annular boss 51 protruding outward in the axial direction, and an annular flange 52 is formed at the outer edge of the working end face, and the inner side wall of the annular flange 52 is a conical surface (with the large end facing outward). The inner diameter of the inner end of the annular flange 52 is consistent with the outer diameter of the first non-woven fabric ring 21a.

[0103] As shown in Figure 5 , the inner diameter of the annular boss 51 is consistent with the inner diameter of the shaft hole of the pressing die (the first pressing die 40 and the second pressing die 50), and the inner wall of the annular boss 51 extends in the direction of the shaft hole wall of the pressing die (the second pressing die 50). The outer diameter of the annular boss 51 is smaller than the outer diameter of the first non-woven fabric ring 21a, but not smaller than the outer diameter of the second non-woven fabric ring 21b.

[0104] The roll sleeve 20 is formed by stacking the plurality of first nonwoven fabric rings 21a and the plurality of second nonwoven fabric rings 21b alternately on the mandrel. The overall thickness of the inner ring (the portion formed by stacking the first nonwoven fabric rings 21a and the second nonwoven fabric rings 21b and finally compressed to form the inner sleeve ring R1) is greater than the overall thickness of the outer ring (the portion formed by stacking only the first nonwoven fabric rings 21a and finally compressed to form the outer sleeve ring R2). The annular boss 51 is formed on the die corresponding to the end of the roll sleeve 20, which helps to ensure that the ends of the roll sleeve 20 are compressed and fixed and shaped, and the end faces of the roll sleeve 20 obtained finally are formed as a plane or close to a plane (at this time, the end face of the inner sleeve ring R1 can be slightly convex relative to the end face of the outer sleeve ring R2 along the axial direction), ensuring that the density of the outer sleeve ring R2 portion of the roll sleeve 20 formed thereon reaches the desired requirement.

[0105] As shown in Figure 6 , Figure 7 , the pair of dies used on the oil press in step (3) is a third die 60 shown in the figure.

[0106] The third die 60 includes an inner die sleeve 61 and an outer die sleeve 62. On the inner die sleeve 61, an axial hole is formed along the axial center line of the inner die sleeve 61, and the two ends of the mandrel 10 can be inserted into the axial hole of the inner die sleeve 61 to apply pressure to the two ends of the roll sleeve 20 to compress and shape them. The axial hole on the inner die sleeve 61 can be a through hole or a counterbore.

[0107] On the outer wall of the inner die sleeve 61, a cylindrical section 611 and a conical section 612 are sequentially formed along the axial direction on the working end face, the small-diameter end of the conical section 612 is connected to the cylindrical section 611, and a plurality of radial flanges 613 are formed around the circumference and distributed alternately near the other end of the conical section 612.

[0108] On the inner wall of the axial hole of the outer die sleeve 62, a cylindrical wall 621 and a conical wall 622 are sequentially formed along the axial direction on the working end face, the flared end of the conical wall 622 is connected to the cylindrical wall 621, and a plurality of tracks 623 are formed around the circumference and distributed alternately near the other end of the conical wall 622, and the tracks 623 extend linearly along the axial direction.

[0109] The inner die sleeve 61 can be inserted into the axial hole of the outer die sleeve 62, and the radial flanges 613 can be matched one by one with the tracks 623, so that the inner die sleeve 61 can move linearly along the axial direction relative to the outer die sleeve 62.

[0110] When the radial flange 613 moves to the inner end of the track 623, the radial flange 613 can be in contact with the tapered wall 622 at the necked end, so that the working end face of the inner mold sleeve 61 and the working end face of the outer mold sleeve 62 are in the same (vertical) plane, and the relative surfaces between the tapered section 612 and the tapered wall 622 can be in contact or have a local radial gap.

[0111] When the radial flange 613 moves to the outer end of the track 623 (as shown in the state), the working end face of the inner mold sleeve 61 can be retracted into the shaft hole of the outer mold sleeve 62. Figure 7

[0112] The outer diameter of the cylindrical section 611 is consistent with the inner diameter of the cylindrical wall 622, and the outer diameter of the cylindrical section 611 is not greater than the outer diameter of the second non-woven fabric ring 21b, and the outer diameters of the two have a gap δ as shown in the figure.

[0113] The roll sleeve 20 is formed by stacking the plurality of first non-woven fabric rings 21a and the plurality of second non-woven fabric rings 21b on the mandrel 10, and the overall thickness of the inner sleeve ring R1 (or inner ring) is greater than the overall thickness of the outer sleeve ring R2 (or outer ring). After the mold at both ends of the roll sleeve 20 is composed of the inner mold sleeve 61 and the outer mold sleeve 62, the working end face size of the mold can be adjusted, the compression and compaction effect can be simultaneously applied to both ends of the entire roll sleeve 20, and the outer sleeve ring R2 of the roll sleeve 20 can be individually compressed and compacted. It is helpful to better ensure that the end faces of the roll sleeve 20 are flat after the compression and fixing and shaping of the two ends are completed, and it is more convenient and accurate to control the density of the outer sleeve ring R2, so as to achieve better expected requirements. The design of the mold helps to improve the operability and controllability in the shaping / setting process of the roll sleeve 20, and improves the hardness control ability of the outer surface layer of the roll sleeve 20.

[0114] After the working end face of the inner mold sleeve 61 and the working end face of the outer mold sleeve 62 are driven to be in the same vertical plane by the oil press, the two ends of the stacked non-woven fabric rings are subjected to compression and fixing treatment in the axial direction, and the pressure is maintained for 15 minutes; then the two outer mold sleeves 62 are driven to approach each other by the oil press, and the two ends of the stacked non-woven fabric rings are subjected to further compression and fixing treatment in the axial direction, and the pressure is maintained for 10 minutes; finally, the working end face of the inner mold sleeve 62 and the working end face of the outer mold sleeve 62 are driven to be in the same vertical plane by the oil press, and the two ends of the stacked non-woven fabric rings are subjected to compression and fixing treatment in the axial direction, and the pressure is maintained for 20 minutes.

[0115] The inner mold sleeve and the outer mold sleeve can be driven separately, work simultaneously and work individually.

[0116] ​The first die 40, the second die 50, and the third die 60 are all provided with flange plate structures connected with the oil press, and the inner die sleeve 61 and the outer die sleeve 62 of the third die 60 are respectively provided with flange plate structures or similar flange plate structures.

[0117] After the non-woven fabric rings 21 with different outer diameters are distinguished, the density / hardness of the roll sleeve 20 after compression setting in the radial direction is differentiated, the density of the inner layer roll sleeve body close to the mandrel 10 is greater than the density of the outer layer roll sleeve body close to the outer surface of the roll sleeve body, and the roll sleeve outer ring is superior to the roll sleeve inner ring in the efficiency of absorbing and discharging oil, but the roll sleeve inner ring is superior to the roll sleeve outer ring in the ability of transmitting torque and extrusion force and stability. Therefore, such a design helps to strengthen the bonding force between the roll sleeve 20 and the mandrel 10, makes the combination between them more firm and reliable, is conducive to the stable transmission of torque and the transmission of extrusion force, and at the same time can ensure that the roll sleeve has good efficiency of absorbing and discharging oil, thereby realizing good control of the thickness of the residual oil on the surface of the plate 100, and better meeting the use requirements, and helping to prolong the effective service life of the extrusion rollers 200 and 300.

[0118] Preferably, the number ratio between the first non-woven fabric ring 21a and the second non-woven fabric ring 21b is in the range of 2:1 to 8:1, Figure 5 、 Figure 6 The embodiment shown is the case of 4:1.

[0119] As Figure 1 、 Figure 8 The plate 100 is shown during cleaning, and the squeeze rollers 200 and 300 are used in pairs, the leading side of the plate 100 is the oil discharge side during cleaning, and the outlet side of the plate 100 is the oil suction side during cleaning. In order to achieve the required squeezing effect, the close contact between the squeeze rollers 200 and 300 and the plate 100 needs to be adjusted to the correct and appropriate pressure P to achieve good close contact effect.

[0120] The appropriate pressure P value: for the squeeze rollers below φ200, the pressure is in the range of 59-78 N / cm; for the squeeze rollers above φ200, the pressure is in the range of 98-118 N / cm.

[0121] According to the pressure P, the deflection amount of the squeeze roller (or roller) is calculated, and if the deflection amount is above 0.2 mm, it is necessary to further process the squeeze roller with an arc.

[0122] Calculation of the deflection amount: Wherein:

[0123] E: elastic modulus (kgf / cm 2 );

[0124] I: moment of inertia (cm 2 );

[0125] L: length from the end face of the roll surface to the axial midpoint of the roll surface;

[0126] a: length from the end face of the roll surface to the axial midpoint of the bearing arranged on the mandrel;

[0127] W: linear pressure (kgf / cm),

[0128] After the camber processing is completed, the squeeze rollers 200, 300 need to be placed on a dynamic balance measuring machine for testing, and corresponding dynamic balance processing measures are taken to adjust the roller sleeve according to the test results.

[0129] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. The present application can be improved in many aspects without departing from the general idea, and those skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical idea disclosed by the present application should be covered by the claims of the present application.

Claims

1. A wringing roller, comprising a mandrel, a roller sleeve sleeved on the mandrel, and a pair of end fixing assemblies; the two end fixing assemblies are correspondingly fixed at the two ends of the mandrel and can press the roller sleeve in the axial direction; characterized in that: The roll cover is a sleeve body formed by laminating and compressing a plurality of non-woven fabric rings stacked on the mandrel; The fit between the non-woven fabric ring and the mandrel is an interference fit or a transition fit; The non-woven fabric ring includes a first non-woven fabric ring and a second non-woven fabric ring, and the outer diameter of the first non-woven fabric ring is larger than that of the second non-woven fabric ring; The first non-woven fabric ring and the second non-woven fabric ring are alternately stacked on the mandrel and laminated and compressed to form a sleeve body; The non-woven fabric ring further includes a third non-woven fabric ring, and the outer diameter of the third non-woven fabric ring is smaller than that of the second non-woven fabric ring; The first non-woven fabric ring and the second non-woven fabric ring are alternately stacked in the middle part of the mandrel, and simultaneously, the third non-woven fabric ring and the first non-woven fabric ring are alternately stacked on both ends of the mandrel, or the third non-woven fabric ring, the second non-woven fabric ring and the first non-woven fabric ring are alternately stacked on both ends of the mandrel.

2. The wringing roller according to claim 1, characterized in that: The outer diameter of the second non-woven fabric ring is 1 / 3 to 2 / 3 of the outer diameter of the first non-woven fabric ring.

3. The wringing roller of claim 1, wherein: The outer diameter of the third non-woven fabric ring is 2 / 3 to 5 / 6 of the outer diameter of the second non-woven fabric ring.

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