Double-piece mining sprocket and method of machining

Abstract

A double-piece mining chain wheel machining method comprises the following steps: machining a blank into a chain wheel blank by drilling and removing excess material; rough machining the outer circle, end face and inner hole of the chain wheel blank; leaving a finish machining allowance during rough machining; quenching and tempering the rough machined chain wheel blank to keep the hardness at HRC 25-35; finish machining the outer circle, grinding the inner hole and end face to ensure dimensional accuracy; chain nest machining; and high-frequency quenching the chain nest.The double-piece chain wheel machining method removes excess metal by drilling and removing excess material, solves the problem that the thickness and weight of the double-piece chain wheel exceed the machining capacity of a profiled flame cutting and a numerical control flame cutting machine, and ensures that the machining does not affect the parent body and ensures machining accuracy, and improves machining efficiency.The double-piece mining chain wheel is also provided.

Description

Technical Field

[0001] This invention relates to the field of mining conveying equipment technology, and in particular to a double-plate mining sprocket and its processing method. Background Technology

[0002] Mining sprockets are crucial components in the transmission of mining scraper conveyors and transfer machines. Since the conveyor traction chain is driven by the sprocket, as the sprocket rotates, its teeth sequentially mesh with the chain links, continuously tractioning the scraper chain for conveying. During operation, the sprocket must withstand the maximum torque of the entire equipment, as well as pulsating and additional loads. The tightness of the meshing between the sprocket and the chain directly affects the transmission quality. Sprockets are generally machined using profile flame cutting or CNC flame cutting. Currently, because the thickness of a single piece in a double-layer sprocket exceeds the maximum thickness that a profile flame cutting nozzle can cut, and the weight of a double-layer sprocket is too heavy, exceeding the maximum weight allowed by a CNC flame cutting machine, a new sprocket machining method is urgently needed to solve the sprocket machining problem. Summary of the Invention

[0003] In order to solve the technical problems existing in the above-mentioned technologies, it is necessary to provide a method for processing double-plate mining sprockets.

[0004] A method for processing a double-plate mining sprocket includes the following steps:

[0005] Step S1: The blank material is processed into a sprocket blank by drilling to remove excess material;

[0006] Step S2: Roughly machine the outer circle, end face, and inner hole of the sprocket blank;

[0007] Step S3: Perform quenching and tempering heat treatment on the rough-machined sprocket blank to maintain the hardness at HRC25-35;

[0008] Step S4: Finish turning the outer diameter and grinding the inner hole and end face;

[0009] Step S5: Chain nest processing;

[0010] Step S6: High-frequency quenching of the chain socket.

[0011] Preferably, in step S1, the sprocket blank is processed in the following manner;

[0012] S11: Place the blank on the workbench, level it and fix it. Mill a 5mm sprocket outline on the end face of the blank to find the positioning reference for subsequent processing.

[0013] S12: Based on the sprocket profile, remove excess metal by drilling holes according to the required number of sprocket teeth, ensuring that the sprocket's dimensions are not affected.

[0014] S13: Turn the sprocket over, align it on the back of the blank according to the alignment line marked during machining, and mill a 5mm sprocket outer platform on the back of the blank to find the positioning reference for subsequent machining.

[0015] S14: Based on the sprocket profile, remove excess metal by drilling holes according to the required number of sprocket teeth, ensuring that the sprocket's dimensions are not affected.

[0016] S15: After drilling holes on the end face and back face of the blank to remove excess material, the sprocket blank needs to be placed in a preheating furnace for preheating and heat preservation. Then, the excess metal left after drilling is removed by flame cutting, and the cut surface is polished to a metallic luster.

[0017] Preferably, after the gas cutting is completed, the sprocket blank is placed in a preheating furnace for post-heat preservation treatment.

[0018] Preferably, the preheating and heat preservation temperature of the sprocket blank is 300-400℃, and it is removed from the furnace after heat preservation for 3 hours; the post-heat preservation temperature of the sprocket blank is 300-400℃, and it is removed from the furnace after heat preservation for 3 hours.

[0019] The preferred method for removing excess material during drilling is as follows:

[0020] Position the center of the hole at the bottom of the positioning tooth;

[0021] Locate the center positions of the two tooth surface removal holes, so that the centers of the two tooth surface removal holes are symmetrically distributed with the diameter of the tooth root removal hole as the axis of symmetry, and ensure that the two tooth surface removal holes are tangent to the outer diameter of the sprocket blank and the tooth root removal hole, respectively.

[0022] Based on the number of teeth on the sprocket, the centers of the holes for removing teeth at the bottom and the holes for removing teeth at the surface are evenly distributed.

[0023] Drill holes to remove excess material according to the center positions of the holes at the tooth root and the tooth surface.

[0024] Preferably, the center position of the tooth root removal hole is obtained by the following method:

[0025] Draw the radius of the sprocket blank with the center of the blank;

[0026] Based on the standard sprocket size, the tooth groove width e k The radius R of the tooth root removal hole is determined by the machining allowance Q1. 齿底 ,Right now

[0027] Based on the radius R of the hole removed at the root of the tooth 齿底 and the root circle radius r of the standard sprocket size. f The sum of the values ​​is used as the radius of the center of the tooth root removal hole, that is, the center position of the tooth root removal hole is R from the center of the sprocket blank.齿底 +r f Place.

[0028] Preferably, the center positions of the two tooth surface removal holes are obtained in the following way:

[0029] The tooth tip circle radius r based on the standard sprocket size a The radius R of the tooth surface removal hole is determined by the pitch circle radius r of the standard sprocket size and the machining allowance Q2. 齿面 ,Right now

[0030] Draw a circle using the center of the sprocket blank and radius R1 as a reference, i.e., R1 = RR. 齿面 , where R is the radius of the sprocket blank after milling out the 5mm sprocket profile table;

[0031] Draw a circle with the center of the hole removed at the tooth root and radius R2 as the reference, that is, R2 = R 齿底 +R 齿面 ;

[0032] The circles with radius R1 and radius R2 intersect at points A and B, which are the centers of the two tooth surface removal holes.

[0033] Preferably, in step S3, the specific method of quenching and tempering heat treatment is as follows:

[0034] S31: The side-mounted loading method is adopted in the box-type resistance furnace, and a gap is left in the middle when loading the furnace;

[0035] S32: After being installed in the preheating furnace, the heating temperature is 820±10℃, and the temperature is maintained for 3 hours;

[0036] S33: After exiting the furnace, cool for 30-40 seconds, the crane drives the parts to swing, and when the water temperature rises to 300-350℃, cool for 20-30 seconds, the crane stops swinging, and when the water temperature rises to 300-350℃, and then cycle the cooling process in sequence, controlling the final cooling to end at 250-300℃.

[0037] S34: Temper immediately after tempering, heating temperature 650±10℃, hold for 3 hours.

[0038] Preferably, in step S6, the specific method of high-frequency quenching of the chain socket is as follows:

[0039] S61: Select a suitable sensor and adjust the sensor to the appropriate gap between the teeth;

[0040] S62: Adjust the gap between the water spray ring and the toothed shape to be uniform, and adjust the water spray pressure to be appropriate;

[0041] S63: Call the programmed instructions. First heating: 100-120 seconds at 1230 rpm, then stop heating for 10 seconds. Second heating: 70-90 seconds at 1235 rpm, then stop heating for 10 seconds. Third heating: 110-150 seconds at 1235 rpm, then water cooling for 70-120 seconds. After the first pair of teeth is machined, repeat the machining process using the same method as the first pair of teeth until all chain sockets are quenched.

[0042] S64: Temper the chain socket promptly after quenching, heating temperature 190±10℃, hold for 2 hours.

[0043] It is also necessary to provide a double-plate mining sprocket.

[0044] A double-plate mining sprocket is manufactured according to the double-plate mining sprocket processing method described above.

[0045] Compared with existing technologies, the double-plate mining sprocket and processing method provided by this invention, based on the shape of the sprocket, machine a 5mm outer platform on the blank surface for precise positioning; determine the center position of the drill hole according to the size of the standard sprocket, select a suitable drill bit, and remove as much excess metal as possible to ensure that it does not affect the base material; solve the problem of processing reference, prevent misalignment of the upper and lower teeth of the sprocket, and avoid frequent misalignment during sprocket assembly; and adopt preheating, gas cutting, and post-heating processes to reduce subsequent processing volume, improve processing efficiency, and shorten the processing cycle. Attached Figure Description

[0046] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a schematic diagram of the machining process of the double-plate mining sprocket of the present invention. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] In the description of this invention, it should be understood that the terms "upper", "middle", "outer", "inner", "lower", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0050] Example 1

[0051] Please refer to Figure 1 This invention provides a method for processing a double-plate mining sprocket, comprising the following steps:

[0052] The blank material is processed into a sprocket blank by drilling to remove excess material;

[0053] The outer diameter, end face, and inner hole of the sprocket blank are machined using rough machining; during rough machining, a finishing allowance needs to be left.

[0054] The rough-machined sprocket blank is subjected to quenching and tempering heat treatment to maintain the hardness at HRC25-35;

[0055] The outer diameter is precision turned, and the inner hole and end face are ground to ensure dimensional accuracy;

[0056] Chain nest processing;

[0057] High-frequency quenching of the chain socket.

[0058] Specifically, the sprocket blank is processed in the following ways;

[0059] Place the blank on the workbench, level it and fix it. Mill a 5mm sprocket outline on the end face of the blank to find the positioning reference for subsequent processing.

[0060] Based on the sprocket profile, and according to the required number of sprocket teeth, excess metal is removed by drilling to remove excess material, ensuring that the sprocket's dimensions are not affected.

[0061] Turn the sprocket over and align it on the back of the blank according to the alignment line marked during machining. Mill a 5mm sprocket outer platform on the back of the blank to find the positioning reference for subsequent machining; at the same time, prevent the upper and lower teeth of the sprocket from being misaligned after gas cutting.

[0062] Based on the sprocket profile, and according to the required number of sprocket teeth, excess metal is removed by drilling to remove excess material, ensuring that the sprocket's dimensions are not affected.

[0063] After drilling holes on the end face and back face of the blank to remove excess material, the sprocket blank needs to be placed in a preheating furnace for preheating and heat preservation. Then, the excess metal left after drilling is removed by flame cutting, and the cut surface is polished to a metallic luster.

[0064] It should be further noted that after the gas cutting is completed, the sprocket blank is placed in a preheating furnace for post-heat preservation treatment.

[0065] In this embodiment, the preheating temperature of the sprocket blank is 300°C, and it needs to be kept at this temperature for 3 hours before being removed from the furnace. This prevents cracks or deformation caused by sudden temperature changes and makes the material more stable in subsequent processing. The post-heating temperature of the sprocket blank is 300°C, and it needs to be kept at this temperature for 3 hours before being removed from the furnace. This reduces residual stress and prevents deformation or cracking.

[0066] Specifically, the method for removing excess material during drilling is as follows:

[0067] Position the center of the hole at the bottom of the positioning tooth;

[0068] Locate the center positions of the two tooth surface removal holes, so that the centers of the two tooth surface removal holes are symmetrically distributed with the diameter of the tooth root removal hole as the axis of symmetry, and ensure that the two tooth surface removal holes are tangent to the outer diameter of the sprocket blank and the tooth root removal hole, respectively.

[0069] Based on the number of teeth on the sprocket, the centers of the holes for removing teeth at the bottom and the holes for removing teeth at the surface are evenly distributed.

[0070] Drill holes to remove excess material according to the center positions of the holes at the tooth root and the tooth surface.

[0071] It should be further noted that the center position of the tooth root removal hole is obtained in the following way:

[0072] Draw the radius of the sprocket blank with the center of the blank;

[0073] Based on the standard sprocket size, the tooth groove width e k The radius R of the tooth root removal hole is determined by the machining allowance Q1. 齿底 ,Right now

[0074] Based on the radius R of the hole removed at the root of the tooth 齿底 and the root circle radius r of the standard sprocket size. f The sum of the values ​​is used as the radius of the center of the tooth root removal hole, that is, the center position of the tooth root removal hole is R from the center of the sprocket blank. 齿底 +r f Place.

[0075] It should be further noted that the center positions of the two tooth surface removal holes are obtained in the following way:

[0076] The tooth tip circle radius r based on the standard sprocket size a The radius R of the tooth surface removal hole is determined by the pitch circle radius r of the standard sprocket size and the machining allowance Q2. 齿面 ,Right now

[0077] Draw a circle using the center of the sprocket blank and radius R1 as a reference, i.e., R1 = RR. 齿面 , where R is the radius of the sprocket blank after milling out the 5mm sprocket profile table;

[0078] Draw a circle with the center of the hole removed at the tooth root and radius R2 as the reference, that is, R2 = R 齿底 +R 齿面 ;

[0079] The circles with radius R1 and radius R2 intersect at points A and B, which are the center positions of the two tooth surface removal holes.

[0080] Specifically, the specific methods of quenching and tempering heat treatment are as follows:

[0081] The box-type resistance furnace is loaded from the side, with a gap left in the middle during loading;

[0082] After being installed in the preheating furnace, the heating temperature is 810℃, and the temperature is maintained for 3 hours;

[0083] After exiting the furnace, the parts are cooled for 30-40 seconds. The overhead crane then moves the parts to oscillate. When the water temperature rises to 300°C, the parts are cooled for 20-30 seconds. The overhead crane stops moving. When the water temperature rises to 300°C, the parts are cooled in a cyclical manner until the final temperature reaches 250°C.

[0084] Temper immediately after tempering, heat to 640℃, and hold for 3 hours.

[0085] Specifically, the high-frequency quenching method for chain sockets is as follows:

[0086] Select a suitable sensor and adjust the sensor to fit the appropriate gap between the teeth;

[0087] Adjust the gap between the water spray ring and the toothed shape to be uniform, and adjust the water spray pressure to be appropriate;

[0088] Call the programmed instructions: first heating for 100-120 seconds at 1230 rpm, then stop heating for 10 seconds; second heating for 70-90 seconds at 1235 rpm, then stop heating for 10 seconds; third heating for 110-150 seconds at 1235 rpm, then spray water to cool for 70-120 seconds; after the first pair of teeth is machined, repeat the machining process using the same method as the first pair of teeth until all chain sockets are quenched.

[0089] After quenching, the chain socket should be tempered promptly at a heating temperature of 180℃ for 2 hours.

[0090] Example 2

[0091] Please refer to Figure 1This invention provides a method for processing a double-plate mining sprocket, comprising the following steps:

[0092] The blank material is processed into a sprocket blank by drilling to remove excess material.

[0093] The outer diameter, end face, and inner hole of the sprocket blank are machined using rough machining; during rough machining, a finishing allowance needs to be left.

[0094] The rough-machined sprocket blank is subjected to quenching and tempering heat treatment to maintain the hardness at HRC25-35;

[0095] The outer diameter is precision machined, and the inner hole and end face are ground to ensure dimensional accuracy;

[0096] Chain nest processing;

[0097] High-frequency quenching of the chain socket.

[0098] Specifically, the sprocket blank is processed in the following ways;

[0099] Place the blank on the workbench, level it and fix it. Mill a 5mm sprocket outline on the end face of the blank to find the positioning reference for subsequent processing.

[0100] Based on the sprocket profile, and according to the required number of sprocket teeth, excess metal is removed by drilling to remove excess material, ensuring that the sprocket's dimensions are not affected.

[0101] Turn the sprocket over and align it on the back of the blank according to the alignment line marked during machining. Mill a 5mm sprocket outer platform on the back of the blank to find the positioning reference for subsequent machining; at the same time, prevent the upper and lower teeth of the sprocket from being misaligned after gas cutting.

[0102] Based on the sprocket profile, and according to the required number of sprocket teeth, excess metal is removed by drilling to remove excess material, ensuring that the sprocket's dimensions are not affected.

[0103] After drilling holes on the end face and back face of the blank to remove excess material, the sprocket blank needs to be placed in a preheating furnace for preheating and heat preservation. Then, the excess metal left after drilling is removed by flame cutting, and the cut surface is polished to a metallic luster.

[0104] It should be further noted that after the gas cutting is completed, the sprocket blank is placed in a preheating furnace for post-heat preservation treatment.

[0105] In this embodiment, the preheating temperature of the sprocket blank is 400°C, and it needs to be kept at this temperature for 3 hours before being removed from the furnace. This prevents cracks or deformation caused by sudden temperature changes and makes the material more stable in subsequent processing. The post-heating temperature of the sprocket blank is 400°C, and it needs to be kept at this temperature for 3 hours before being removed from the furnace. This reduces residual stress and prevents deformation or cracking.

[0106] Specifically, the method for removing excess material during drilling is as follows:

[0107] Position the center of the hole at the bottom of the positioning tooth;

[0108] Locate the center positions of the two tooth surface removal holes, so that the centers of the two tooth surface removal holes are symmetrically distributed with the diameter of the tooth root removal hole as the axis of symmetry, and ensure that the two tooth surface removal holes are tangent to the outer diameter of the sprocket blank and the tooth root removal hole, respectively.

[0109] Based on the number of teeth on the sprocket, the centers of the holes for removing teeth at the bottom and the holes for removing teeth at the surface are evenly distributed.

[0110] Drill holes to remove excess material according to the center positions of the holes at the tooth root and the tooth surface.

[0111] It should be further noted that the center position of the tooth root removal hole is obtained in the following way:

[0112] Draw the radius of the sprocket blank with the center of the blank;

[0113] Based on the standard sprocket size, the tooth groove width e k The radius R of the tooth root removal hole is determined by the machining allowance Q1. 齿底 ,Right now

[0114] Based on the radius R of the hole removed at the root of the tooth 齿底 and the root circle radius r of the standard sprocket size. f The sum of the values ​​is used as the radius of the center of the tooth root removal hole, that is, the center position of the tooth root removal hole is R from the center of the sprocket blank. 齿底 +r f Place.

[0115] It should be further noted that the center positions of the two tooth surface removal holes are obtained in the following way:

[0116] The tooth tip circle radius r based on the standard sprocket size a The radius R of the tooth surface removal hole is determined by the pitch circle radius r of the standard sprocket size and the machining allowance Q2. 齿面 ,Right now

[0117] Draw a circle using the center of the sprocket blank and radius R1 as a reference, i.e., R1 = RR. 齿面 , where R is the radius of the sprocket blank after milling out the 5mm sprocket profile table;

[0118] Draw a circle with the center of the hole removed at the tooth root and radius R2 as the reference, that is, R2 = R 齿底 +R 齿面 ;

[0119] The circles with radius R1 and radius R2 intersect at points A and B, which are the center positions of the two tooth surface removal holes.

[0120] Specifically, the specific methods of quenching and tempering heat treatment are as follows:

[0121] The box-type resistance furnace is loaded from the side, with a gap left in the middle during loading;

[0122] After being installed in the preheating furnace, the heating temperature is 830℃, and the temperature is maintained for 3 hours;

[0123] After exiting the furnace, the parts are cooled for 30-40 seconds. The overhead crane then moves the parts to oscillate. When the water temperature rises to 350°C, the parts are cooled for 20-30 seconds. The overhead crane stops moving. When the water temperature rises to 350°C, the parts are cooled in a cyclical manner until the final cooling temperature reaches 300°C.

[0124] Temper immediately after tempering, heat to 660℃, and hold for 3 hours.

[0125] Specifically, the high-frequency quenching method for chain sockets is as follows:

[0126] Select a suitable sensor and adjust the sensor to fit the appropriate gap between the teeth;

[0127] Adjust the gap between the water spray ring and the toothed shape to be uniform, and adjust the water spray pressure to be appropriate;

[0128] Call the programmed instructions: first heating for 100-120 seconds at 1230 rpm, then stop heating for 10 seconds; second heating for 70-90 seconds at 1235 rpm, then stop heating for 10 seconds; third heating for 110-150 seconds at 1235 rpm, then spray water to cool for 70-120 seconds; after the first pair of teeth is machined, repeat the machining process using the same method as the first pair of teeth until all chain sockets are quenched.

[0129] After quenching, the chain socket should be tempered promptly at a heating temperature of 200℃ for 2 hours.

[0130] Example 3

[0131] Please refer to Figure 1 This invention provides a method for processing a double-plate mining sprocket, comprising the following steps:

[0132] The blank material is processed into a sprocket blank by drilling to remove excess material.

[0133] The outer diameter, end face, and inner hole of the sprocket blank are machined using rough machining; during rough machining, a finishing allowance needs to be left.

[0134] The rough-machined sprocket blank is subjected to quenching and tempering heat treatment to maintain the hardness at HRC25-35;

[0135] The outer diameter is precision machined, and the inner hole and end face are ground to ensure dimensional accuracy;

[0136] Chain nest processing;

[0137] High-frequency quenching of the chain socket.

[0138] Specifically, the sprocket blank is processed in the following ways;

[0139] Place the blank on the workbench, level it and fix it. Mill a 5mm sprocket outline on the end face of the blank to find the positioning reference for subsequent processing.

[0140] Based on the sprocket profile, and according to the required number of sprocket teeth, excess metal is removed by drilling to remove excess material, ensuring that the sprocket's dimensions are not affected.

[0141] Turn the sprocket over and align it on the back of the blank according to the alignment line marked during machining. Mill a 5mm sprocket outer platform on the back of the blank to find the positioning reference for subsequent machining; at the same time, prevent the upper and lower teeth of the sprocket from being misaligned after gas cutting.

[0142] Based on the sprocket profile, and according to the required number of sprocket teeth, excess metal is removed by drilling to remove excess material, ensuring that the sprocket's dimensions are not affected.

[0143] After drilling holes on the end face and back face of the blank to remove excess material, the sprocket blank needs to be placed in a preheating furnace for preheating and heat preservation. Then, the excess metal left after drilling is removed by flame cutting, and the cut surface is polished to a metallic luster.

[0144] It should be further noted that after the gas cutting is completed, the sprocket blank is placed in a preheating furnace for post-heat preservation treatment.

[0145] In this embodiment, the preheating temperature of the sprocket blank is 350°C, and it needs to be kept at this temperature for 3 hours before being removed from the furnace. This prevents cracks or deformation caused by sudden temperature changes and makes the material more stable in subsequent processing. The post-heating temperature of the sprocket blank is 350°C, and it needs to be kept at this temperature for 3 hours before being removed from the furnace. This reduces residual stress and prevents deformation or cracking.

[0146] Specifically, the method for removing excess material during drilling is as follows:

[0147] Position the center of the hole at the bottom of the positioning tooth;

[0148] Locate the center positions of the two tooth surface removal holes, so that the centers of the two tooth surface removal holes are symmetrically distributed with the diameter of the tooth root removal hole as the axis of symmetry, and ensure that the two tooth surface removal holes are tangent to the outer diameter of the sprocket blank and the tooth root removal hole, respectively.

[0149] Based on the number of teeth on the sprocket, the centers of the holes for removing teeth at the bottom and the holes for removing teeth at the surface are evenly distributed.

[0150] Drill holes to remove excess material according to the center positions of the holes at the tooth root and the tooth surface.

[0151] It should be further noted that the center position of the tooth root removal hole is obtained in the following way:

[0152] Draw the radius of the sprocket blank with the center of the blank;

[0153] Based on the standard sprocket size, the tooth groove width e k The radius R of the tooth root removal hole is determined by the machining allowance Q1. 齿底 ,Right now

[0154] Based on the radius R of the hole removed at the root of the tooth 齿底 and the root circle radius r of the standard sprocket size. f The sum of the values ​​is used as the radius of the center of the tooth root removal hole, that is, the center position of the tooth root removal hole is R from the center of the sprocket blank. 齿底 +r f Place.

[0155] It should be further noted that the center positions of the two tooth surface removal holes are obtained in the following way:

[0156] The tooth tip circle radius r based on the standard sprocket size a The radius R of the tooth surface removal hole is determined by the pitch circle radius r of the standard sprocket size and the machining allowance Q2. 齿面 ,Right now

[0157] Draw a circle using the center of the sprocket blank and radius R1 as a reference, i.e., R1 = RR. 齿面 , where R is the radius of the sprocket blank after milling out the 5mm sprocket profile table;

[0158] Draw a circle with the center of the hole removed at the tooth root and radius R2 as the reference, that is, R2 = R 齿底 +R 齿面 ;

[0159] The circles with radius R1 and radius R2 intersect at points A and B, which are the center positions of the two tooth surface removal holes.

[0160] Specifically, the specific methods of quenching and tempering heat treatment are as follows:

[0161] The box-type resistance furnace is loaded from the side, with a gap left in the middle during loading;

[0162] After being installed in the preheating furnace, the heating temperature is 820℃, and the temperature is maintained for 3 hours;

[0163] After exiting the furnace, the parts are cooled for 30-40 seconds. The overhead crane then moves the parts to oscillate. When the water temperature rises to 325°C, the parts are cooled for 20-30 seconds. The overhead crane stops moving. When the water temperature rises to 325°C, the parts are cooled in a cyclical manner until the final temperature reaches 275°C.

[0164] Temper immediately after tempering, heat to 650℃, and hold for 3 hours.

[0165] Specifically, the high-frequency quenching method for chain sockets is as follows:

[0166] Select a suitable sensor and adjust the sensor to fit the appropriate gap between the teeth;

[0167] Adjust the gap between the water spray ring and the toothed shape to be uniform, and adjust the water spray pressure to be appropriate;

[0168] Call the programmed instructions: first heating for 100-120 seconds at 1230 rpm, then stop heating for 10 seconds; second heating for 70-90 seconds at 1235 rpm, then stop heating for 10 seconds; third heating for 110-150 seconds at 1235 rpm, then spray water to cool for 70-120 seconds; after the first pair of teeth is machined, repeat the machining process using the same method as the first pair of teeth until all chain sockets are quenched.

[0169] After quenching, the chain socket is tempered promptly at a heating temperature of 190℃ for 2 hours.

[0170] In one embodiment, the present invention also provides a double-plate mining sprocket, which is manufactured according to a double-plate mining sprocket processing method.

[0171] The above-disclosed embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the invention. Those skilled in the art will understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A method for processing a double-plate mining sprocket, characterized in that: Includes the following steps, Step S1: The blank material is processed into a sprocket blank by drilling to remove excess material; Step S2: Roughly machine the outer circle, end face, and inner hole of the sprocket blank; Step S3: Perform quenching and tempering heat treatment on the rough-machined sprocket blank to maintain the hardness at HRC25-35; Step S4: Finish turning the outer diameter and grinding the inner hole and end face; Step S5: Chain nest processing; Step S6: High-frequency quenching of the chain socket; In step S1, the sprocket blank is processed in the following manner; S11: Place the blank on the workbench, level it and fix it. Mill a 5mm sprocket outline on the end face of the blank to find the positioning reference for subsequent processing. S12: Based on the sprocket profile, remove excess metal by drilling holes according to the required number of sprocket teeth, ensuring that the sprocket's dimensions are not affected. S13: Turn the sprocket over, align it on the back of the blank, and mill a 5mm sprocket outline on the back of the blank to find the positioning reference for subsequent processing; S14: Based on the sprocket profile, remove excess metal by drilling holes according to the required number of sprocket teeth, ensuring that the sprocket's dimensions are not affected. S15: After drilling holes on the end face and back face of the blank to remove excess material, the sprocket blank needs to be placed in a preheating furnace for preheating and heat preservation. Then, the excess metal left after drilling is removed by flame cutting, and the cut surface is polished to a metallic luster. The specific methods for removing excess material during drilling are as follows: Position the center of the hole at the bottom of the positioning tooth; Locate the center positions of the two tooth surface removal holes, so that the centers of the two tooth surface removal holes are symmetrically distributed with the diameter of the tooth root removal hole as the axis of symmetry, and ensure that the two tooth surface removal holes are tangent to the outer diameter of the sprocket blank and the tooth root removal hole, respectively. Based on the number of teeth on the sprocket, the centers of the holes for removing teeth at the bottom and the holes for removing teeth at the surface are evenly distributed. Drill holes to remove excess material according to the center positions of the holes at the tooth root and the tooth surface.

2. The method for processing double-plate mining sprockets according to claim 1, characterized in that: After gas cutting, the sprocket blank is placed in a preheating furnace for post-heat preservation treatment.

3. The method for processing double-plate mining sprockets according to claim 2, characterized in that: The preheating and heat preservation temperature of the sprocket blank is 300-400℃, and it is removed from the furnace after heat preservation for 3 hours; the post-heating and heat preservation temperature of the sprocket blank is 300-400℃, and it is removed from the furnace after heat preservation for 3 hours.

4. The method for processing double-plate mining sprockets according to claim 3, characterized in that: The center position of the tooth root removal hole is obtained in the following way. Draw the radius of the sprocket blank with the center of the blank; Tooth width based on standard sprocket dimensions and processing allowance Determine the radius of the tooth root removal hole ,Right now ; Based on the radius of the tooth root removal hole and the root circle radius of standard sprocket size. The sum of the values ​​is used as the radius of the center of the tooth root removal hole, meaning the center of the tooth root removal hole is located at a distance from the center of the sprocket blank. Place.

5. The method for processing double-plate mining sprockets according to claim 4, characterized in that: The center positions of the two toothed removal holes are obtained in the following way: The tooth tip circle radius based on standard sprocket dimensions Pitch circle radius of standard sprocket size and processing allowance Determine the radius of the tooth surface removal hole ,Right now ; With the center and radius of the sprocket blank Draw a circle based on the reference point, that is, ,in The radius of the sprocket blank after milling out the 5mm sprocket profile table; The center and radius of the hole are removed by the tooth root. Draw a circle based on the reference point, that is, ; radius circle and radius The circles intersect at points A and B, which are the centers of the two toothed removal holes.

6. The method for processing double-plate mining sprockets according to claim 1, characterized in that: In step S3, the specific method of quenching and tempering heat treatment is as follows: S31: The box-type resistance furnace adopts side-mounted loading, with a gap left in the middle during loading; S32: After being installed in the preheating furnace, the heating temperature is 820±10℃, and the temperature is maintained for 3 hours; S33: After exiting the furnace, cool for 30-40 seconds at the first cooling. The crane drives the parts to swing. When the water temperature rises to 325℃, cool for 20-30 seconds at the second cooling. The crane stops swinging. When the water temperature rises to 325℃, continue the cooling cycle. Control the final cooling to end at 275℃. S34: Temper immediately after tempering, heating temperature 650±10℃, hold for 3 hours.

7. The method for processing double-plate mining sprockets according to claim 1, characterized in that: In step S6, the specific method of high-frequency quenching of the chain socket is as follows: S61: Select sensor, adjust the gap between sensor and 1 pair of teeth; S62: Adjust the gap between the water spray ring and the toothed shape to be uniform, and adjust the water spray pressure; S63: Call the programmed instructions. First heating: 100-120 seconds at 1230 rpm, then stop heating for 10 seconds. Second heating: 70-90 seconds at 1235 rpm, then stop heating for 10 seconds. Third heating: 110-150 seconds at 1235 rpm, then water cooling for 70-120 seconds. After the first pair of teeth is machined, repeat the machining process using the same method as the first pair of teeth until all chain sockets are quenched. S64: Temper the chain socket promptly after quenching, heating temperature 190±10℃, hold for 2 hours.

8. A double-plate mining sprocket, manufactured by the double-plate mining sprocket processing method according to any one of claims 1-7.

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