A high-strength cold-rolled working roll and manufacturing process

Abstract

The present invention discloses a high-strength cold-rolled working roller and a manufacturing process, including a cold-rolled roller, wherein a fixing groove is provided inside the cold-rolled roller, and the left and right ends of the fixing groove are detachably mounted with mounting heads, a thread line is provided on one side of the mounting head, and a threaded sleeve is threadedly mounted on the other end of the mounting head, a thread groove is provided inside the threaded sleeve, and a rotating component is fixedly connected to one side of the threaded sleeve, and a fixed limit plate is detachably mounted on the outer side of the rotating component. The present invention uses a dual-frequency quenching step to minimize the deformation of the workpiece after the synchronous dual-frequency induction quenching treatment of the roller, and can obtain a good hardened layer, with less environmental pollution and extremely fast heating speed. At the same time, an adjustable intermediate frequency and high frequency ratio is adopted, and the intermediate frequency and high frequency are output on an induction heater at the same time, and the left and right ends of the roller are evenly heated, so that a balanced contour hardened layer can be obtained, further improving the strength and toughness of the structure.

Description

Technical Field

[0001] The present invention relates to the technical field of cold rolling rollers, and more specifically, to a high-strength cold rolling working roller and a manufacturing process thereof. Background Art

[0002] Cold-rolled silicon steel has the characteristics of small iron loss, small coercive force, high magnetic permeability and magnetic induction intensity. It is an important functional material that is indispensable to the power, electronics and military industries. Its manufacturing technology and product quality are one of the important indicators of a scientific and technological development level. Due to the increase in silicon content, the yield strength and tensile strength of cold-rolled silicon steel increase significantly, the elongation decreases, the hardness increases rapidly, and the brittleness increases synchronously. At the same time, in order to obtain the ideal organization, large reduction rolling must be adopted during the cold rolling process. The deformation heat of rolling can increase the temperature of the steel plate to about 100℃~300℃. This working temperature has exceeded the final tempering temperature of about 130℃~150℃ in the manufacturing process of ordinary cold rolling rollers.

[0003] Among them, the current cold rolling rollers are mostly solid integral structures when they are heated. On the one hand, the heating heat cannot be transported to the inside in time, and on the other hand, it is easy to cause the temperature inside and outside of the cold rolling roller to be inconsistent, resulting in incomplete preheating. During use, rolling accidents such as broken strips are very likely to occur, causing steel sticking; rolling cycle is too long, surface cracks or peeling; stress concentration such as rolling overload causes roller breakage and other problems;

[0004] On the other hand, in the current production of cold rolling rollers, since the cold rolling rollers are lubricated, oiled, cooled and coated after production, the roller surfaces are subjected to periodic alternating stress when working for a long time, which can easily lead to fatigue cracks and peeling. The quality of the cold rolling rollers leaving the factory after the production process needs to be improved. In particular, the cold rolling rollers as a whole need to be repeatedly quenched before they can perform high-intensity work.

[0005] Therefore, in view of this, the inventor, based on his many years of rich experience in design, development and actual production in the related industry, has conducted research and improvements on the existing structure and deficiencies, and provided high-strength cold-rolled working rolls and manufacturing processes, in order to achieve a more practical purpose. Summary of the invention

[0006] In order to overcome the above-mentioned defects of the prior art, the embodiments of the present invention provide a high-strength cold-rolled working roll and a manufacturing process. By setting a fixed threaded sleeve, a rotating assembly, a connecting column, a fixed limit plate and a fixed block, and utilizing the mutual cooperation of the several components, when the roller is subjected to residual heat, the heat can be effectively conducted to the inside of the roller through a plurality of fins and heating wires, and the roller is uniformly heated inside and outside and front and back, thereby further improving its heating efficiency. Through the dual-frequency quenching step, the deformation of the workpiece is extremely small after the synchronous dual-frequency induction quenching treatment of the roller, and a good hardened layer can be obtained, with less environmental pollution and extremely fast heating speed. At the same time, the roller can be subjected to the dual-frequency induction quenching treatment. By adjusting the ratio of medium frequency and high frequency, and outputting medium frequency and high frequency on an induction heater at the same time, the left and right ends of the roller are evenly heated, so as to obtain a balanced profile hardened layer, and further improve its high strength toughness. By setting a tempering step and adopting an induction tempering method, the induction heating method and the traditional tempering heating method are essentially different, that is, induction heating is the induction eddy current that causes the surface of the steel to self-heat and heat for a short time; traditional tempering heating is the external heating body that heats through heat conduction and radiation, and the time is long. There is enough time for the heat to be conducted inside the steel and make the temperature uniform, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-strength cold-rolled working roller and a manufacturing process, comprising a cold-rolled roller, a fixing groove is provided inside the cold-rolled roller, and mounting heads are detachably mounted on the left and right ends of the fixing groove, a thread line is provided on one side of the mounting head, and a thread sleeve is threadedly mounted on the other end of the mounting head, a thread groove is provided inside the thread sleeve, a rotating assembly is fixedly connected to one side of the thread sleeve, and a fixed limiting plate is detachably mounted on the outer side of the rotating assembly;

[0008] A connecting column is embedded and installed on one side of the installation head, and a fixing block is detachably sleeved on one side of the rotating component.

[0009] In a preferred embodiment, the rotating assembly includes a fixed turntable, a fixed groove is opened on one side of the fixed turntable, a fixed rotating hole is opened inside the fixed groove, a fixed pin is fixedly sleeved inside the fixed rotating hole, and a fixed rotating block is rotatably sleeved on the bottom end of the fixed pin.

[0010] In a preferred embodiment, a fixed circular hole is provided on the surface of the fixed rotating block, a pair of sliding arc grooves are symmetrically provided on the top of the fixed rotating disk, and a semicircular slot opening is provided on one side of the sliding arc groove.

[0011] In a preferred embodiment, a fixing through hole is opened in the center of the fixed turntable, a compression spring is embedded and installed on one side of the fixing groove, and the other end of the compression spring is embedded and sleeved with an arc-shaped toggle plate.

[0012] In a preferred embodiment, the fixed limiting plate includes a fixed ring, the inner surface of the fixed ring is provided with a socket, the inner wall surface of the socket is fixedly sleeved with a fixed limiting circle, and the inner wall of the fixed limiting circle is provided with limiting grooves arranged in sequence.

[0013] In a preferred embodiment, the connecting column includes a fixed column, the surface of the fixed column is provided with heat-conducting grooves in the outer circumferential direction, the outer surface of the fixed column is fitted with a heating surround wire, the surface of the fixed column is fitted with a second heating fin and a first heating fin in a mirror-symmetrical manner, and the interior of the second heating fin and the first heating fin is inlaid with a fixed cylinder, the number of the fixed columns is two, and the two fixed columns are respectively located inside the second heating fin and the first heating fin.

[0014] In a preferred embodiment, the fixing block includes a fixing column, a rotating handle is embedded on the top of the fixing column, an outer surface of the rotating handle is provided with anti-slip stripes, and a fixed limit block is symmetrically installed on the outer peripheral side of the fixing column.

[0015] In a preferred embodiment, the fixed limit block fits the surface of the sliding arc groove, and one side of the fixed limit block is adapted to the shape of the semicircular slot opening, and the length of the fixed limit block ranges from ten centimeters to eight centimeters.

[0016] In a preferred embodiment, the manufacturing process of the cold rolling working roll is as follows: S1, raw material selection: selecting any one of 9Cr, 9Cr2, 9Crv, 8CrMoV and other materials as the main material of the rolling roll for manufacturing;

[0017] S2. Smelting and casting: raw materials weighing between 10 kg and 50 kg are subjected to high-temperature smelting at 1500 to 1800 degrees Celsius, and then the metal raw materials melted by high-temperature smelting are vacuum degassed and impurities are removed. After smelting, the molten liquid metal is poured into a special mold for rolling rollers through a carrier for shape casting, followed by natural cooling for ten to twenty-four hours;

[0018] S3, tempering treatment: the whole roll is continuously heated by the heating equipment for fifteen to thirty minutes, until the roll temperature reaches thirty to sixty degrees Celsius, and then the roll is double-frequency quenched. The heating and cooling process of the roll can be described as follows: heating begins when any point (point P) on the roll body enters the upper inductor; the surface is heated to the austenitizing temperature required for quenching at the outlet of the upper inductor; between the upper and lower inductors is the so-called heating interval, at this time, the roll surface gradually cools down due to heat loss, and at a certain depth, the temperature continues to rise due to the conduction of surface heat to the inside. When point P reaches the vicinity of the inlet of the lower inductor, the surface temperature drops to the lowest. In principle, this temperature should not be lower than the lowest austenitizing temperature of the cold-rolled roll steel (about 780-800℃). After point P enters the lower inductor, it continues to be heated until the outlet of the lower inductor, and the surface is heated to a more suitable austenitizing temperature, and then enters the water sprayer for quenching and cooling, thereby completing the double-frequency quenching process;

[0019] S4, low temperature tempering: (1) First, clean the parts to ensure that there is no moisture, iron filings, residual salt and dirt adhering to them. Check whether the parts have any defects such as bruises and cracks. (2) Check whether the equipment and instruments are operating normally and adjust the instrument temperature as required. (3) Check whether the route sheet and the parts are consistent to avoid making the wrong parts. Count the number of parts. If there is any missing, find it in time or report it to the higher level. Then place the parts inside the heating equipment and continue to heat it to 250 to 350 degrees Celsius.

[0020] S5. Flaw detection: Magnetic powder is spread on the surface of the roll, and then the magnetizing current is passed through the surface of the ferromagnetic workpiece to form an electromagnetic field. The existence of defects will cut off the magnetic lines of force, forming a leakage magnetic field and adsorbing magnetic powder. The magnetic powder accumulates to form magnetic marks. The existence of defects is judged by observing the magnetic marks. After the electroplated working roll is lifted out of the plating tank, the surface is rinsed with chromic acid after passing the flaw detection, and then anti-rust oil is applied;

[0021] S6. Roller pretreatment: Use a special grinder for working rolls to grind the surface of the working rolls, remove all the original coatings, and apply anti-rust oil on the surface after grinding;

[0022] S7, Shot blasting: Use steel shot with a particle size of 0.4-2.0mm and a hardness of 50HRC. Under the condition of a roller speed of 1-2 revolutions per minute, use a pressure of 0.5-0.6MPa for shot blasting 2-5 times, each time for 15-20 minutes, until the roughness reaches 2.0-3.0μm, the Pc value reaches 90-120, and a layer of evenly distributed arc-shaped pits and protrusions is formed on the surface of the working roller;

[0023] S8, degreasing the roller surface with alkaline water after texturing: wipe the roller surface with a sponge dipped in alkaline water, wherein each kilogram of the alkaline water is composed of 50 grams of sodium hydroxide, 20 grams of sodium carbonate, 20 grams of sodium phosphate, and 910 grams of water; after the roller surface is free of water splashes, rinse the roller surface with pure water;

[0024] S9, anodic etching: the working roll in step 3 is hoisted with a special hoist and immersed in a preheating tank under the condition that the roll surface is kept wet, and after preheating at 50-60° C. for 15 minutes, the rectifier is turned on and anodic etching is performed for 1-2 minutes in a constant current mode. The composition of the preheating tank is chromic anhydride (CrO3) 250g / L, and the anode current density is 10-15A / dm;

[0025] S10, electroplating chromium: the working roller after the anodic etching is moved into the electroplating tank, and the moving process is not rinsed, and the electroplating is completed within two minutes. The electroplating conditions are: chromic anhydride (CrO3) 250g / L, sulfuric acid (H2SO4) 2.5g / L, trivalent chromium (Cr) 3g / L, and the temperature is 45-55°C; after entering the tank, the cathode is turned on and the rotation speed is 1 revolution per minute. After 2 minutes, the rectifier voltage is adjusted in a step-by-step manner to 21V, 2V, and 3V, and each is maintained for 60 seconds. Then, the impact chromium plating is performed for 12 seconds under the condition of the cathode current density of 60-80A / dm, and finally, the normal electroplating of chromium is performed under the condition of the cathode current density of 20-40A / dm, and maintained for 10 minutes;

[0026] S11. Packaging and warehousing: After the rollers of different specifications are protected by foam sponge packaging, they are placed in cartons in sequence for storage. Then the cartons are sealed at the top with tapes. Then the cartons and the rollers are placed in a cool and dark place for storage.

[0027] In a preferred embodiment, the roller parts after induction quenching in step 4 are subjected to a heat preservation tempering treatment at a temperature of 150 to 250°C for 1.5 to 3 hours, and air-cooled to precipitate fine carbides from the solid solution of the quenched martensite to form tempered martensite. The hardness of the quenched martensite is controlled at 50 to 62 HRC by tempering at different temperatures to obtain comprehensive mechanical properties. The surface hardness of the tempered parts is tested. After the second tempering of the parts at the same temperature and time, the difference in surface hardness is not greater than 1 HRC, which means that the parts are fully tempered. The heating of the electric heating tempering furnace is air conduction and thermal radiation, and the temperature measuring device is a thermocouple. The temperature of the parts can be accurately characterized by the temperature of the temperature field in the furnace. Induction tempering and induction tempering equipment adopt electromagnetic field induction heating, that is, steel generates induced eddy currents in a magnetic field with a lower frequency, thereby generating heat and tempering the parts. The parts are heat-generating bodies, and infrared thermometers are used to measure the surface temperature of the parts. During the temperature measurement process, infrared thermometers are affected by many factors of environmental conditions.

[0028] Technical effects and advantages of the present invention:

[0029] 1. The present invention sets a fixed threaded sleeve, a rotating assembly, a connecting column, a fixed limit plate and a fixed block, and utilizes the mutual cooperation of the several parts, so that when the residual heat of the roller is used, the heat can be effectively conducted to the inside of the roller through a plurality of fins and heating wires, and the roller is evenly heated inside and outside and front and back, so as to further improve the heating efficiency and avoid incomplete preheating. During use, rolling accidents such as broken strips are prone to occur, such as sticking steel; too long rolling cycle, surface cracks or peeling; roller breakage caused by stress concentration such as rolling overload;

[0030] 2. The present invention sets a tempering step and adopts an induction tempering method. The induction heating method is essentially different from the traditional tempering heating method. That is, induction heating is to induce eddy current to make the surface of the steel self-heating and heating, and the time is short; the traditional tempering heating is that the external heating body is heated by heat conduction and radiation, and the time is long, and there is enough time for the heat to be conducted inside the steel and make the temperature uniform;

[0031] 3. The present invention uses a dual-frequency quenching step to minimize the deformation of the workpiece after the synchronous dual-frequency induction quenching treatment of the roller, and can obtain a good hardened layer, with less environmental pollution and extremely fast heating speed. At the same time, an adjustable medium frequency and high frequency ratio is adopted, and the medium frequency and high frequency are output on an induction heater at the same time, and the left and right ends of the roller are evenly heated, so that a balanced contour hardened layer can be obtained, and its high strength toughness can be further improved;

[0032] 4. The present invention sets an electromagnetic flaw detection step. The magnetic particle flaw detection technology is mainly used to determine the cracks on the surface of the rolling wheel body and the fatigue cracks in the rolling neck area, excessive cyclic loads or subsequent normal corrosion. The principle of magnetic particle flaw detection: electromagnetic principle, the magnetizing current forms an electromagnetic field through the surface of the ferromagnetic workpiece. The existence of defects will cut off the magnetic lines of force, form a leakage magnetic field and absorb magnetic powder. The magnetic powder accumulates to form magnetic traces. The existence of defects is judged by observing the magnetic traces (the magnetic traces are essentially magnified defects), so as to accurately control the quality of the roller and further refine the inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 It is a schematic diagram of the internal assembly structure of the present invention;

[0035] Figure 3 It is a schematic diagram of the three-dimensional assembly structure of the present invention;

[0036] Figure 4 It is a schematic diagram of a partially enlarged assembly structure of the present invention;

[0037] Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure at point A;

[0038] Figure 6 It is a schematic diagram of the internal assembly structure of the cold rolling roller of the present invention;

[0039] Figure 7 It is a schematic diagram of the structure of the rotating assembly of the present invention;

[0040] Figure 8 This is a data diagram of the hardness gradient detection of parts after dual-frequency quenching of the present invention.

[0041] The accompanying drawings are marked as follows: 1. cold rolling roller; 2. fixed groove; 3. mounting head; 4. thread line; 5. fixed thread sleeve; 6. thread groove; 7. rotating assembly; 8. fixed limit plate; 9. connecting column; 10. fixed block; 71. fixed turntable; 72. fixed groove; 73. fixed rotating hole; 74. fixed pin shaft; 75. fixed rotating block; 76. fixed circular hole; 77. sliding arc groove; 78. semicircular slot; 79. fixed through hole; 710. arc toggle plate; 711. compression spring; 81. fixed ferrule; 82. socket; 83. fixed limit circle; 84. limit slot; 91. fixed column; 92. heat conduction groove; 93. first heating fin; 94. heating surround wire; 95. second heating fin; 96. fixed cylinder; 101. fixed column; 102. rotating handle; 103. fixed limit block. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] As attached Figure 1 To Attachment Figure 7 A high-strength cold-rolled working roller and a manufacturing process are shown, comprising a cold-rolled roller 1, wherein a fixing groove 2 is provided inside the cold-rolled roller 1, and mounting heads 3 are detachably mounted on the left and right ends of the fixing groove 2, one side of the mounting head 3 is provided with a thread line 4, and a thread sleeve 5 is threadedly mounted on the other end of the mounting head 3, a thread groove 6 is provided inside the thread sleeve 5, a rotating component 7 is fixedly connected to one side of the thread sleeve 5, and a fixed limiting plate 8 is detachably mounted on the outer side of the rotating component 7;

[0044] A connecting column 9 is embedded and installed on one side of the mounting head 3 , and a fixing block 10 is detachably mounted on one side of the rotating assembly 7 .

[0045] The rotating assembly 7 includes a fixed rotating disk 71, a fixed groove 72 is provided on one side of the fixed rotating disk 71, a fixed rotating hole 73 is provided inside the fixed rotating hole 73, a fixed pin shaft 74 is fixedly sleeved inside the fixed rotating hole 73, a fixed rotating block 75 is rotatably sleeved on the bottom end of the fixed pin shaft 74, a fixed circular hole 76 is provided on the surface of the fixed rotating block 75, and a pair of sliding arc grooves 77 are symmetrically provided on the top of the fixed rotating disk 71, one side of the sliding arc groove 77 is provided The side is connected to each other with a semicircular slot 78, the fixed limiting plate 8 includes a fixed ring 81, the inner surface of the fixed ring 81 is provided with a socket 82, the inner wall surface of the socket 82 is fixedly sleeved with a fixed limiting circle 83, and the inner wall of the fixed limiting circle 83 is provided with limiting slots 84 arranged in sequence, the fixed block 10 includes a fixed column 101, the top of the fixed column 101 is inlaid with a rotating handle 102, and the outer surface of the rotating handle 102 is provided with anti-slip stripes, The outer peripheral side of the fixed column 101 is symmetrically installed with a fixed limit block 103, the fixed limit block 103 is in contact with the surface of the sliding arc groove 77, and one side of the fixed limit block 103 is adapted to the shape of the semicircular slot 78, and the length of the fixed limit block 103 ranges from ten centimeters to eight centimeters. The roller parts after induction quenching in step 4 are subjected to a heat preservation and tempering treatment at a temperature of 150 to 250°C for 1.5 to 3 hours, and air-cooled to remove carbon from the solid of the quenched martensite. Fine carbides are precipitated on the solution to form tempered martensite. After tempering at different temperatures, the hardness of the quenched martensite is controlled at 50-62HRC to obtain comprehensive mechanical properties. The surface hardness of the tempered parts is tested. After the second tempering at the same temperature and time, the difference in surface hardness is no more than 1HRC, which means that the parts are fully tempered. The heating of the electric heating tempering furnace is air conduction and thermal radiation. The temperature measuring device is a thermocouple. The temperature of the parts can be accurately characterized by the temperature of the temperature field in the furnace. Induction tempering and induction tempering equipment use electromagnetic field induction heating, that is, steel generates induced eddy currents in a magnetic field with a lower frequency, thereby generating heat and tempering the parts. The parts are heating elements, and infrared thermometers are used to measure the surface temperature of the parts. The infrared thermometer is affected by many factors affecting environmental conditions during the temperature measurement process.

[0046] For details, please refer to the attached manual Figure 1 -Attached Figure 6The connecting column 9 includes a fixed column 91, and the surface of the fixed column 91 is provided with heat-conducting grooves 92 in the outer circumferential direction. The outer surface of the fixed column 91 is fitted with a heating surrounding wire 94. The surface of the fixed column 91 is fitted with a second heating fin 95 and a first heating fin 93 in a mirror-symmetrical manner. The second heating fin 95 and the first heating fin 93 are embedded with a fixed cylinder 96. The number of the fixed columns 96 is two, and the two fixed columns 96 are respectively located inside the second heating fin 95 and the first heating fin 93. The material of the two heating fins is an alloy material component.

[0047] The specific implementation method is as follows: the material of the heating fins is an alloy material, which has the advantages of several component metals. It has higher mechanical strength, better corrosion resistance, lighter weight, harder, tougher, and better fatigue resistance than a single metal. On the other hand, 1. The melting point of most alloys is lower than the melting point of any component metal in its components; 2. The hardness is generally greater than the hardness of any metal in its components; Special case: Sodium-potassium alloy is liquid and is used as a thermal conductor in atomic reactors; 3. The electrical conductivity and thermal conductivity of the alloy are lower than any component metal. Using this characteristic of the alloy, high-resistance and high-thermal resistance materials can be manufactured, and materials with special properties can also be manufactured; 4. Some have strong corrosion resistance (such as stainless steel). For example, adding 15% chromium and 9% nickel to iron can obtain a corrosion-resistant stainless steel suitable for the chemical industry.

[0048] For details, please refer to the attached manual Figure 5 A fixing through hole 79 is provided at the center of the fixing turntable 71 , a compression spring 711 is embedded and installed on one side of the fixing groove 72 , and an arc-shaped toggle plate 710 is embedded and sleeved on the other end of the compression spring 711 .

[0049] The specific implementation method is: one side of the arc-shaped toggle plate 710 is in close contact with the side of the fixed rotating block 75, so that it can press the side of the fixed rotating block 75 through the compression spring 711, thereby effectively fixing it elastically, so that it can be elastically moved successively through the inner wall surface of the limiting groove 84 by the compression spring 711, and after passing through, it can be reset by the rebound force of the compression spring 711, thereby achieving the effect of limiting locking.

[0050] Among them, the induction heating method and the traditional tempering heating method are somewhat different in nature, that is, induction heating is to heat the steel surface by induction eddy current, and the time is short; traditional tempering heating is to heat the steel surface by external heating body through heat conduction and radiation, and the time is long, which has enough time for the heat to be conducted inside the steel and make the temperature uniform. In order to check the tempering degree of the entire hardened layer, the hardness gradient of the parts after induction tempering is measured to reflect the effect of the penetration heating depth of the induction eddy current during induction tempering. Hardening layer gradient measurement, such as Figure 8 shown.

[0051] Working principle of the present invention:

[0052] Step 1: First, the operator assembles the various components of the device normally, and then starts the device normally.

[0053] Step 2: First, S1, raw material selection: select any one of 9Cr, 9Cr2, 9Crv, 8CrMoV and other materials as the main material of the roller for production;

[0054] S2. Smelting and casting: raw materials weighing between 10 kg and 50 kg are subjected to high-temperature smelting at 1500 to 1800 degrees Celsius, and then the metal raw materials melted by high-temperature smelting are vacuum degassed and impurities are removed. After smelting, the molten liquid metal is poured into a special mold for rolling rollers through a carrier for shape casting, followed by natural cooling for ten to twenty-four hours;

[0055] S3, tempering treatment: the whole roll is continuously heated by the heating equipment for fifteen to thirty minutes, until the roll temperature reaches thirty to sixty degrees Celsius, and then the roll is double-frequency quenched. The heating and cooling process of the roll can be described as follows: heating starts when any point P on the roll body enters the upper inductor; the surface is heated to the austenitizing temperature required for quenching at the outlet of the upper inductor; between the upper and lower inductors is the so-called heating interval, at this time, the roll surface gradually cools down due to heat loss, and at a certain depth, the temperature continues to rise due to the conduction of surface heat to the inside. When point P reaches the vicinity of the inlet of the lower inductor, the surface temperature drops to the lowest. In principle, this temperature should not be lower than the lowest austenitizing temperature of the cold-rolled roll steel (about 780-800℃). After point P enters the lower inductor, it continues to be heated until the outlet of the lower inductor, and the surface is heated to a more suitable austenitizing temperature, and then enters the water sprayer for quenching and cooling, thereby completing the double-frequency quenching process;

[0056] S4, low temperature tempering: (1) First, clean the parts to ensure that there is no moisture, iron filings, residual salt and dirt adhering to them. Check whether the parts have any defects such as bruises and cracks. (2) Check whether the equipment and instruments are operating normally and adjust the instrument temperature as required. (3) Check whether the route sheet and the parts are consistent to avoid making the wrong parts. Count the number of parts. If there is any missing, find it in time or report it to the higher level. Then place the parts inside the heating equipment and continue to heat it to 250 to 350 degrees Celsius.

[0057] S5. Flaw detection: Magnetic powder is spread on the surface of the roll, and then the magnetizing current is passed through the surface of the ferromagnetic workpiece to form an electromagnetic field. The existence of defects will cut off the magnetic lines of force, forming a leakage magnetic field and adsorbing magnetic powder. The magnetic powder accumulates to form magnetic marks. The existence of defects is judged by observing the magnetic marks. After the electroplated working roll is lifted out of the plating tank, the surface is rinsed with chromic acid after passing the flaw detection, and then anti-rust oil is applied;

[0058] S6. Roller pretreatment: Use a special grinder for working rolls to grind the surface of the working rolls, remove all the original coatings, and apply anti-rust oil on the surface after grinding;

[0059] S7, Shot blasting: Use steel shot with a particle size of 0.4-2.0mm and a hardness of 50HRC. Under the condition of a roller speed of 1-2 revolutions per minute, use a pressure of 0.5-0.6MPa for shot blasting 2-5 times, each time for 15-20 minutes, until the roughness reaches 2.0-3.0μm, the Pc value reaches 90-120, and a layer of evenly distributed arc-shaped pits and protrusions is formed on the surface of the working roller;

[0060] S8, degreasing the roller surface with alkaline water after texturing: wipe the roller surface with a sponge dipped in alkaline water, wherein each kilogram of the alkaline water is composed of 50 grams of sodium hydroxide, 20 grams of sodium carbonate, 20 grams of sodium phosphate, and 910 grams of water; after the roller surface is free of water splashes, rinse the roller surface with pure water;

[0061] S9, anodic etching: the working roll in step 3 is hoisted with a special hoist and immersed in a preheating tank under the condition that the roll surface is kept wet, and after preheating at 50-60° C. for 15 minutes, the rectifier is turned on and anodic etching is performed for 1-2 minutes in a constant current mode. The composition of the preheating tank is chromic anhydride (CrO3) 250g / L, and the anode current density is 10-15A / dm;

[0062] S10, electroplating chromium: the working roller after the anodic etching is moved into the electroplating tank, and the moving process is not rinsed, and the electroplating is completed within two minutes. The electroplating conditions are: chromic anhydride (CrO3) 250g / L, sulfuric acid (H2SO4) 2.5g / L, trivalent chromium (Cr) 3g / L, and the temperature is 45-55°C; after entering the tank, the cathode is turned on and the rotation speed is 1 revolution per minute. After 2 minutes, the rectifier voltage is adjusted in a step-by-step manner to 21V, 2V, and 3V, and each is maintained for 60 seconds. Then, the impact chromium plating is performed for 12 seconds under the condition of the cathode current density of 60-80A / dm, and finally, the normal electroplating of chromium is performed under the condition of the cathode current density of 20-40A / dm, and maintained for 10 minutes;

[0063] S11. Packaging and warehousing: After the rollers of different specifications are protected by foam sponge packaging, they are placed in cartons in sequence for storage. Then the cartons are sealed at the top with tapes. Then the cartons and the rollers are placed in a cool and dark place for storage.

[0064] Step 3: First, the operator shuts down the device normally, then checks whether the fixation between the various components of the device is normal, and then replaces and repairs the aging and severely worn parts inside the device.

[0065] 5. The above scheme, by setting a fixed threaded sleeve, a rotating assembly, a connecting column, a fixed limit plate and a fixed block, utilizes the mutual cooperation of the several, so that when the roller is subjected to residual heat, the heat can be effectively conducted to the inside of the roller through a number of fins and heating wires, and the roller is evenly heated inside and outside and front and back, further improving its heating efficiency, while also avoiding incomplete preheating. During use, it is very easy to cause steel sticking caused by rolling accidents such as broken strips; rolling cycle is too long, surface cracks or peeling; rolling overload and other stress concentration causes roller breakage. At the same time, by setting a tempering step and adopting an induction tempering method, the induction heating method and the traditional tempering heating method There are some essential differences, namely, induction heating is the self-heating heating of the steel surface by induction of eddy currents, and the time is short; traditional tempering heating is the heating by external heating body through heat conduction and radiation, and the time is long, and there is enough time for the heat to be conducted inside the steel and make the temperature uniform; on the other hand, through the dual-frequency quenching step, the deformation of the workpiece of the rolling mill is extremely small after the synchronous dual-frequency induction quenching treatment, and a good hardened layer can be obtained, with less environmental pollution and extremely fast heating speed. At the same time, an adjustable medium frequency and high frequency ratio is adopted, and the medium frequency and high frequency are output on one induction heater at the same time, and the left and right ends of the rolling mill are evenly heated, so as to obtain a balanced contour hardened layer, further improving its high strength toughness.

[0066] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0067] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0068] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-strength cold rolling work roll, comprising a cold rolling roll (1), wherein a fixing groove (2) is provided inside the cold rolling roll (1), and wherein: The left and right ends of the interior of the fixed groove (2) are respectively detachably provided with mounting heads (3), one side of the mounting head (3) is provided with a thread line (4), the other end of the mounting head (3) is threadedly provided with a thread sleeve (5), the interior of the thread sleeve (5) is provided with a thread groove (6), one side of the thread sleeve (5) is fixedly connected with a rotating assembly (7), the rotating assembly (7) comprises a fixed rotating disk (71), one side of the fixed rotating disk (71) is provided with a fixed groove (72), the fixed rotating disk (71) is provided with a fixed groove (73), the fixed rotating disk (71) is provided with a fixed groove (74), the fixed rotating disk (71) is provided with a fixed groove (75), the fixed rotating disk (71) is provided with a fixed groove (76), the fixed rotating disk (71) is provided with a fixed groove (77), the fixed rotating disk (71) is provided with a fixed groove (77), the fixed rotating disk (71) is provided with a fixed groove (77), the fixed rotating disk (71) is provided with a fixed groove (77), the fixed rotating disk (71) is provided with a fixed groove (77), the fixed rotating disk (71) is provided with a fixed groove (77), the fixed rotating disk (71) is provided with a fixed groove (77), the fixed rotating disk (71) is provided with a fixed groove (75), the fixed rotating disk (71) is provided with a fixed groove (76 ... A fixed rotating hole (73) is provided inside the fixed groove (72), a fixed pin shaft (74) is fixedly sleeved inside the fixed rotating hole (73), a fixed rotating block (75) is rotatably sleeved on the bottom end of the fixed pin shaft (74), a fixed circular hole (76) is provided on the surface of the fixed rotating block (75), a pair of sliding arc grooves (77) are symmetrically provided on the top end of the fixed rotating disk (71), and a semicircular slot opening (78) is provided on one side of the sliding arc groove (77); The outer side of the rotating assembly (7) is detachably sleeved with a fixed limiting plate (8), the fixed limiting plate (8) comprising a fixed ferrule (81), the inner surface of the fixed ferrule (81) is provided with a sleeve interface (82), the inner wall surface of the sleeve interface (82) is fixedly sleeved with a fixed limiting circle (83), and the inner wall of the fixed limiting circle (83) is provided with limiting notches (84) arranged in sequence; A connecting column (9) is embedded and installed on one side of the mounting head (3); a fixing block (10) is detachably mounted on one side of the rotating assembly (7); the fixing block (10) comprises a fixing column (101); a rotating handle (102) is embedded on the top of the fixing column (101); an anti-slip stripe is provided on the outer surface of the rotating handle (102); a fixed stop block (103) is symmetrically installed on the outer peripheral side of the fixing column (101); the fixed stop block (103) is fitted with the surface of the sliding arc groove (77); and one side of the fixed stop block (103) is adapted to the shape of the semicircular slot (78); and the length of the fixed stop block (103) ranges from ten centimeters to eight centimeters.

2. A high-strength cold-rolled working roll according to claim 1, characterized in that: A fixing through hole (79) is provided at the center of the fixed rotating disk (71), a compression spring (711) is embedded and installed on one side of the fixing groove (72), and the other end of the compression spring (711) is embedded and sleeved with an arc-shaped toggle plate (710), and one side of the arc-shaped toggle plate (710) is in close contact with the side surface of the fixed rotating block (75).

3. A high-strength cold-rolled working roll according to claim 1, characterized in that: The connecting column (9) comprises a fixed column (91), the surface of the fixed column (91) is provided with heat-conducting grooves (92) in the outer circumferential direction, the outer surface of the fixed column (91) is fitted with a heating surrounding wire (94), the surface of the fixed column (91) is fitted with a second heating fin (95) and a first heating fin (93) in a mirror-symmetrical manner, and the interior of the second heating fin (95) and the first heating fin (93) is inlaid with a fixed cylinder (96), the number of the fixed cylinders (96) is two, and the two fixed cylinders (96) are respectively located inside the second heating fin (95) and the first heating fin (93).

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