CN110791728A - Surface treatment process for gear ring of gearbox - Google Patents
Surface treatment process for gear ring of gearbox Download PDFInfo
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- CN110791728A CN110791728A CN201911090452.2A CN201911090452A CN110791728A CN 110791728 A CN110791728 A CN 110791728A CN 201911090452 A CN201911090452 A CN 201911090452A CN 110791728 A CN110791728 A CN 110791728A
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- gear
- gear ring
- nitriding
- ring
- furnace body
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/40—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions
- C23C8/42—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions only one element being applied
- C23C8/48—Nitriding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/06—Use of materials; Use of treatments of toothed members or worms to affect their intrinsic material properties
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/17—Toothed wheels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/17—Toothed wheels
- F16H2055/176—Ring gears with inner teeth
Abstract
The invention belongs to the technical field of part treatment, and particularly relates to a surface treatment process for a gear ring of a gearbox, wherein a nitriding furnace adopted by the treatment process comprises a cylindrical furnace body; a group of flame spraying pipes are uniformly distributed on the circumference of the bottom of the furnace body; a nitriding tank is arranged at the center of the bottom in the furnace body, and a nitriding agent solution is filled in the nitriding tank; an air supply pipe communicated with an external nitrogen tank is arranged at the bottom of the nitriding tank; the middle part of the furnace body is rotationally connected with a round pipe, the round pipe is driven to rotate by a motor fixed on the outer wall of the furnace body, and the motor is connected with a power supply through a controller; one end of the circular tube, which is close to the middle part of the furnace body, is fixedly connected with a gear, the gear is engaged with a gear ring to be processed, and the bottom of the gear ring is soaked in a nitriding agent solution; the gear of the invention drives the gear ring to rotate, so that the gear ring is rapidly heated in the furnace body, and the part of the gear ring above the nitriding agent solution is rapidly heated and then rotates into the nitriding agent solution, thereby further improving the temperature rise speed of the gear ring and further increasing the nitriding quality and efficiency of the gear ring.
Description
Technical Field
The invention belongs to the technical field of part treatment, and particularly relates to a surface treatment process for a gear ring of a gearbox.
Background
The functions of the transmission of a vehicle include changing the gear ratio; under the condition that the rotation direction of the engine is not changed, the automobile runs backwards; with neutral, power transfer is interrupted to enable the engine to be pneumatically, idle, and in neutral or power transmission with the transmission. The gearbox mainly comprises a gear, a shaft and a pin shaft. The gear ring is arranged on the peripheral surface of the gear and divided into a front gear ring and a rear gear ring, the gear ring is embedded on the outer edge of the gear after being heated, and the gear ring is fastened on the outer edge of the gear after being cooled and is used for being meshed with a starter gear to drive a crankshaft to rotate and start an engine.
The existing gear ring processing technology comprises seven steps of forging a blank, rough and semi-finish turning, gas nitriding, polishing, grinding an end face, finally inspecting and finishing, and the processed gear ring can achieve the purposes of improving hardness and resisting wear.
However, the gears of the speed changer always work under the constantly changing rotating speed and load, the tooth surface of the gear is impacted by the impact load, so that the gear (especially the tooth surface) is damaged, the gear ring of the speed changer adopting the gas nitriding treatment has the advantages of long nitriding production period, low efficiency and large brittleness of a carburized layer, and abnormal sound is caused during the operation of the speed changer because the gas nitriding is not uniform, the abrasion of the end and the tooth surface of the gear ring is caused, and the meshing is not good
Disclosure of Invention
The invention provides a surface treatment process for a gear ring of a gearbox, which aims to make up for the defects of the prior art and solve the problems that a nitriding production period is long, the efficiency is low, the brittleness of a carburized layer is high, and abnormal sound is generated during the operation of the gearbox due to the fact that the gear ring end and the gear surface are abraded and not meshed well because of nonuniform gas nitriding.
The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a surface treatment process for a gear ring of a gearbox, which comprises the following steps:
s1, finishing: performing gear shaping finish machining on the gear ring blank by using a gear shaping machine to obtain a gear ring of the gearbox;
s2, first cleaning: putting a gear ring of a gearbox into a cleaning pool for cleaning, wherein the temperature in the cleaning pool is 60-70 ℃;
s3, preheating: placing the gear ring of the gearbox into an air furnace for preheating treatment, wherein the temperature in the air furnace is 380 ℃, and the temperature is maintained for 40 minutes;
s4, carburizing and nitriding: putting the gear ring of the gearbox into a nitriding furnace for nitriding and carburizing, wherein the temperature in the nitriding furnace is 565 ℃, and the temperature is maintained for 3.5 hours;
s5, oxidation treatment: putting the gear ring of the gearbox into an oxidation furnace for oxidation treatment, wherein the temperature in the oxidation furnace is 420 ℃, and the temperature is maintained for 1 hour;
s6, secondary cleaning: putting the gear box gear ring into a cleaning pool for cleaning, wherein the temperature in the cleaning pool is 40-50 ℃, soaking and cleaning for 20 minutes, then polishing the surface of the gear box gear ring, and finally soaking the gear box gear ring in oil to prevent the gear box gear ring from being oxidized;
the nitriding furnace adopted by the invention comprises a cylindrical furnace body; a group of foot supports are uniformly distributed on the circumference of the bottom of the furnace body, a group of fire spraying pipes are uniformly distributed on the circumference of the bottom of the furnace body, the fire spraying pipes penetrate through the furnace body and extend to the interior of the furnace body, and the fire spraying pipes are communicated with fuel gas through valves; a furnace door is arranged on one side of the furnace body and used for loading or taking out the gear ring; a nitriding tank is arranged in the center of the bottom inside the furnace body, and a nitriding agent solution is filled in the nitriding tank; an air supply pipe communicated with an external nitrogen tank is arranged at the bottom of the nitriding tank; the top of the furnace body is provided with an exhaust pipe which is communicated with a tail gas treatment device; the middle part of the furnace body is rotationally connected with a round pipe, the round pipe is driven to rotate by a motor fixed on the outer wall of the furnace body, and the motor is connected with a power supply through a controller; one end of the circular tube, which is close to the middle part of the furnace body, is fixedly connected with a gear, the gear is engaged with a gear ring to be processed, and the bottom of the gear ring is soaked in a nitriding agent solution; the motor drives the gear to rotate, so that the gear ring is driven to rotate, the temperature of the gear ring immersed in the nitriding agent solution is increased, and the nitriding quality and efficiency of the gear ring are increased; when the nitriding furnace is used, a gear ring to be nitrided is placed on a gear in the furnace body through a furnace door, the gear ring and the gear are meshed with each other, the bottom of the gear ring is immersed in a nitriding agent solution in a nitriding tank, the furnace door is closed, fuel gas is introduced into a flame spraying pipe and ignited, the temperature in the furnace body is raised, after the temperature in the furnace body reaches a preset temperature, a motor is started through a controller, the motor drives a round pipe to rotate, the gear drives the gear ring to rotate, the part, located above the nitriding agent solution, of the gear ring is rapidly heated and then rotates into the nitriding agent solution, nitrogen is blown into the nitriding tank through an air supply pipe at the moment, the nitriding agent is made to roll and cooperate with the nitrogen to finish nitriding operation on the gear ring, the gear ring is driven to rotate through the gear ring, the gear ring is rapidly heated in the furnace body, the temperature raising.
Preferably, the middle part of the gear is provided with a blind hole communicated with the circular tube; the circular tube is internally communicated with gas; a group of first holes are uniformly distributed on the circumference of the top of the gear, and second holes are communicated with the blind holes; the fuel gas in the circular tube is sprayed out from the first hole and is combusted, so that the heating efficiency of the gear ring is further increased, and the nitriding quality and efficiency of the gear ring are further increased; when the gear drives the gear ring to rotate and simultaneously carry out nitriding operation in the nitriding tank, the gas is introduced into the circular tube, so that the gas is sprayed out after passing through the circular tube, the blind hole and the first hole, and the gas sprayed out from the first hole is ignited to rapidly heat the gear ring passing through the gear ring, thereby further improving the utilization rate of the gas, increasing the heating efficiency of the gear ring, saving the gas and further increasing the nitriding quality and efficiency of the gear ring.
Preferably, a sliding block with a semicircular cross section is rotatably connected in the blind hole, and fuel gas is sprayed out from a first hole in the upper part of the gear through the blocking of the sliding block, so that the fuel gas consumption is further reduced, and the nitriding quality and efficiency of the gear ring are further improved; when the gear rotates, the sliding block is connected with the blind hole in a rotating mode, the sliding block is located at the bottom of the blind hole all the time under the action of self gravity, and then the sliding block enables gas to be sprayed out of a hole below the gear, the gas can be sprayed out of a hole on one side, close to the gear ring, of the gear from the top of the gear only, the gear ring is heated, the utilization rate of the gas is further improved, and the nitriding quality and efficiency of the gear ring are further improved.
Preferably, the tooth height of the gear is larger than that of the gear ring, and the tooth thickness of the gear is smaller than that of the gear ring, so that the gas sprayed from the first hole can be conveniently and fully combusted, the heating efficiency of the gear ring is further increased, and the nitriding quality and efficiency of the gear ring are further increased; because the tooth height of the gear is greater than that of the gear ring, and the tooth thickness of the gear is smaller than that of the gear ring, the gas sprayed from the first hole can be sufficiently combusted in the gap between the gear and the gear ring, the heating effect of the heat generated by gas combustion on the gear ring is further improved, the gas is further saved, and the nitriding quality and efficiency of the gear ring are improved.
Preferably, a group of grooves are uniformly arranged on the top of the gear; the first hole is positioned at the bottom of the groove; the groove is matched with the first hole, so that the blocking of the gear ring to the gas sprayed out of the first hole is further reduced, the heating efficiency of the gear ring after the gas is combusted is further increased, and the nitriding quality and efficiency of the gear ring are further increased; set up the hole No. one in the recess bottom through the recess cooperation, further increased the combustion efficiency of a hole spun gas, reduce the ring gear to blockking of a hole spun gas for the gas is exothermic in the burning of dashing milk powder in the clearance between recess and gear and ring gear, further increases the gas burning and to the heating efficiency of ring gear, increases the quality and the efficiency of ring gear nitriding.
Preferably, circular shoulder protectors are arranged on two sides of the gear, and the shoulder protectors are matched with the gear to form a structure with an H-shaped cross section, so that the gear ring is prevented from falling off from the gear in the rotating process; a group of second holes are uniformly distributed on the circumference of one side, close to the gear, of the shoulder protector, and the second holes are communicated with the blind holes; the diameter of the second hole is gradually reduced along the outward direction of the radius of the shoulder pad, so that the temperature of the gear ring is gradually reduced from the tooth top to the tooth bottom, the toughness of the tooth bottom of the gear ring is increased, and the nitriding quality and efficiency of the gear ring are further increased; through shoulder pad cooperation gear, further reduce the probability that the ring gear rotates the in-process and drops from the gear, guarantee ring gear nitriding operation and normally go on, simultaneously, the hole No. two that set up on the shoulder pad can carry out abundant heating to the ring gear side, further improve the heating efficiency of ring gear, because the diameter in hole No. two reduces along the outside direction of shoulder pad radius gradually, make the inside position heating effect that is close to the ring gear be greater than the outside heating effect of ring gear, and then make the temperature of the inboard addendum of ring gear be higher than the temperature of dedendum, carry out good carburization effect at the addendum, make the nitriding of dedendum department less when increasing flank of tooth hardness and stand wear resistance, increase the toughness of dedendum department, reduce disconnected tooth, thereby further increase the life of ring gear, further increase the quality and the efficiency of ring gear nitriding.
The invention has the following beneficial effects:
1. according to the surface treatment process for the gear ring of the gearbox, the gear ring is driven to rotate through the gear, so that the gear ring is rapidly heated in the furnace body, the part, located above the nitriding agent solution, of the gear ring is rapidly heated and then rotates into the nitriding agent solution, the temperature rise speed of the gear ring is further improved, and the nitriding quality and efficiency of the gear ring are further improved.
2. According to the surface treatment process for the gear ring of the gearbox, the sliding block is always positioned at the bottom of the blind hole under the action of self gravity, so that the sliding block prevents gas from being sprayed out of the first hole below the gear, the gas can be sprayed out of the first hole above the gear and close to one side of the gear ring, the gear ring is heated, the utilization rate of the gas is further improved, and the nitriding quality and efficiency of the gear ring are further improved.
Drawings
The invention will be further explained with reference to the drawings.
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a perspective view of a nitriding furnace employed in the present invention;
FIG. 3 is a sectional view of a nitriding furnace used in the present invention;
FIG. 4 is an enlarged view of a portion of FIG. 3 at A;
FIG. 5 is a structural view of a gear in the present invention;
in the figure: furnace body 1, heel brace 11, flame projecting pipe 12, furnace gate 13, nitriding groove 14, air feed pipe 15, blast pipe 16, pipe 2, gear 21, blind hole 22, No. one hole 23, slider 24, recess 25, shoulder pad 26, No. two holes 27.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1 to 5, the surface treatment process for the gear ring of the gearbox, provided by the invention, comprises the following steps:
s1, finishing: performing gear shaping finish machining on the gear ring blank by using a gear shaping machine to obtain a gear ring of the gearbox;
s2, first cleaning: putting a gear ring of a gearbox into a cleaning pool for cleaning, wherein the temperature in the cleaning pool is 60-70 ℃;
s3, preheating: placing the gear ring of the gearbox into an air furnace for preheating treatment, wherein the temperature in the air furnace is 380 ℃, and the temperature is maintained for 40 minutes;
s4, carburizing and nitriding: putting the gear ring of the gearbox into a nitriding furnace for nitriding and carburizing, wherein the temperature in the nitriding furnace is 565 ℃, and the temperature is maintained for 3.5 hours;
s5, oxidation treatment: putting the gear ring of the gearbox into an oxidation furnace for oxidation treatment, wherein the temperature in the oxidation furnace is 420 ℃, and the temperature is maintained for 1 hour;
s6, secondary cleaning: putting the gear box gear ring into a cleaning pool for cleaning, wherein the temperature in the cleaning pool is 40-50 ℃, soaking and cleaning for 20 minutes, then polishing the surface of the gear box gear ring, and finally soaking the gear box gear ring in oil to prevent the gear box gear ring from being oxidized;
the nitriding furnace adopted by the invention comprises a cylindrical furnace body 1; a group of foot supports 11 are uniformly distributed on the circumference of the bottom of the furnace body 1, a group of fire spraying pipes 12 are uniformly distributed on the circumference of the bottom of the furnace body 1, the fire spraying pipes 12 penetrate through the furnace body 1 and extend into the furnace body 1, and the fire spraying pipes 12 are communicated with fuel gas through valves; a furnace door 13 is arranged on one side of the furnace body 1, and the furnace door 13 is used for loading or taking out the gear ring; a nitriding tank 14 is arranged at the center of the bottom in the furnace body 1, and a nitriding agent solution is filled in the nitriding tank 14; an air feed pipe 15 communicated with an external nitrogen tank is arranged at the bottom of the nitriding groove 14; an exhaust pipe 16 is arranged at the top of the furnace body 1, and the exhaust pipe 16 is communicated with a tail gas treatment device; the middle part of the furnace body 1 is rotatably connected with a circular tube 2, the circular tube 2 is driven to rotate by a motor fixed on the outer wall of the furnace body 1, and the motor is connected with a power supply through a controller; one end of the circular tube 2 close to the middle part of the furnace body 1 is fixedly connected with a gear 21, the gear 21 is engaged with a gear ring to be processed, and the bottom of the gear ring is soaked in a nitriding agent solution; the gear 21 is driven to rotate by the motor, so that the gear ring is driven to rotate, the temperature of the gear ring immersed in the nitriding agent solution is increased, and the nitriding quality and efficiency of the gear ring are increased; when in use, the gear ring to be nitrided is put on the gear 21 in the furnace body 1 through the furnace door 13, so that the gear ring and the gear 21 are mutually meshed, the bottom of the gear ring is immersed in the nitriding agent solution in the nitriding tank 14, then the furnace door 13 is closed, the gas is introduced into the flame-spraying pipe 12 and ignited, so that the temperature in the furnace body 1 rises, the motor is turned on through the controller after the temperature in the furnace body 1 reaches the preset temperature, the motor drives the circular pipe 2 to rotate, then the gear wheel 21 drives the gear ring to rotate, the part of the gear ring above the nitriding agent solution is quickly heated and then rotates into the nitriding agent solution, at this time, nitrogen is blown into the nitriding tank 14 through the air feed pipe 15, so that the nitriding agent rolls and finishes the nitriding operation of the gear ring by matching with the nitrogen, the gear 21 drives the gear ring to rotate, so that the gear ring is rapidly heated in the furnace body 1, the temperature rise speed of the gear ring is further increased, and the nitriding quality and efficiency of the gear ring are further improved.
As an embodiment of the invention, the middle part of the gear 21 is provided with a blind hole 22 communicated with the circular tube 2; the circular tube 2 is internally communicated with gas; a group of first holes 23 are uniformly distributed on the circumference of the tooth top of the gear 21, and the first holes 23 are communicated with the blind holes 22; the fuel gas in the circular tube 2 is sprayed out from the first hole 23 and is combusted, so that the heating efficiency of the gear ring is further increased, and the nitriding quality and efficiency of the gear ring are further increased; when the gear 21 drives the gear ring to rotate and simultaneously carry out nitriding operation in the nitriding tank 14, gas is introduced into the circular tube 2, so that the gas is sprayed out after passing through the circular tube 2, the blind hole 22 and the first hole 23, and the gas sprayed out from the first hole 23 is ignited to rapidly heat the gear ring passing through the gear 21, thereby further improving the utilization rate of the gas, increasing the heating efficiency of the gear ring, saving the gas and further increasing the nitriding quality and efficiency of the gear ring.
As an embodiment of the invention, a sliding block 24 with a semicircular cross section is rotatably connected in the blind hole 22, and the blocking of the sliding block 24 enables gas to be sprayed out from a first hole 23 on the upper part of the gear 21, so that the gas consumption is further reduced, and the nitriding quality and efficiency of the gear ring are further improved; when the gear 21 rotates, the sliding block 24 is rotatably connected with the blind hole 22, the sliding block 24 is always positioned at the bottom of the blind hole 22 under the action of self gravity, and then the sliding block 24 prevents the fuel gas from being sprayed out of the first hole 23 below the gear 21, so that the fuel gas can be sprayed out of the first hole 23 above the gear 21 and close to one side of the gear ring only, the gear ring is heated, the utilization rate of the fuel gas is further improved, and the nitriding quality and the nitriding efficiency of the gear ring are further improved.
As an embodiment of the invention, the tooth height of the gear 21 is greater than that of the gear ring, and the tooth thickness of the gear 21 is less than that of the gear ring, so that the gas sprayed from the first hole 23 can be conveniently and fully combusted, the heating efficiency of the gear ring is further increased, and the nitriding quality and efficiency of the gear ring are further increased; because the tooth height of the gear 21 is larger than that of the gear ring, and the tooth thickness of the gear 21 is smaller than that of the gear ring, the fuel gas sprayed from the first hole 23 is fully combusted in the gap between the gear 21 and the gear ring, the heating effect of the heat generated by fuel gas combustion on the gear ring is further improved, the fuel gas is further saved, and the nitriding quality and efficiency of the gear ring are improved.
As an embodiment of the present invention, a set of grooves 25 is uniformly formed on the tooth top of the gear 21; the first hole 23 is positioned at the bottom of the groove 25; the groove 25 is matched with the first hole 23, so that the blocking of the ring gear to the gas sprayed out of the first hole 23 is further reduced, the heating efficiency of the ring gear after the gas is combusted is further increased, and the nitriding quality and efficiency of the ring gear are further increased; offer the hole 23 No. one in recess 25 bottom through recess 25 cooperation, further increased the combustion efficiency of hole 23 spun gas, reduce the ring gear and to blockking of hole 23 spun gas for the gas is exothermic in the burning of dashing milk powder in the clearance between recess 25 and gear 21 and ring gear, further increases the gas burning and to the heating efficiency of ring gear, increases the quality and the efficiency of ring gear nitridation.
As an embodiment of the invention, circular shoulder protectors 26 are arranged on two sides of the gear 21, and the shoulder protectors 26 cooperate with the gear 21 to form a structure with an H-shaped cross section, so that the gear ring is prevented from falling off from the gear 21 in the rotation process; a group of second holes 27 are uniformly distributed on the circumference of one side, close to the gear 21, of the shoulder protector 26, and the second holes 27 are communicated with the blind hole 22; the diameter of the second hole 27 is gradually reduced along the outward direction of the radius of the shoulder pad 26, so that the temperature of the gear ring is gradually reduced from the tooth top to the tooth bottom, the toughness of the tooth bottom of the gear ring is increased, and the nitriding quality and efficiency of the gear ring are further increased; through shoulder pad 26 cooperation gear 21, further reduce the probability that the ring gear rotates the in-process and drops from gear 21, guarantee ring gear nitriding operation and normally go on, simultaneously, the second hole 27 of seting up on the shoulder pad 26 can carry out abundant heating to the ring gear side, further improve the heating efficiency of ring gear, because the diameter of second hole 27 reduces along the outside direction of shoulder pad 26 radius gradually, make the inside position heating effect that is close to the ring gear be greater than the outside heating effect of ring gear, and then make the temperature of the inboard addendum of ring gear be higher than the temperature of dedendum, carry out good carburization effect at the addendum, make the nitriding of dedendum department less when increasing flank hardness and stand wear resistance, increase the toughness of dedendum department, reduce disconnected tooth, thereby further increase the life of ring gear, further increase the quality and the efficiency of ring gear nitriding.
When in use, the gear ring to be nitrided is put on the gear 21 in the furnace body 1 through the furnace door 13, so that the gear ring and the gear 21 are mutually meshed, the bottom of the gear ring is immersed in the nitriding agent solution in the nitriding tank 14, then the furnace door 13 is closed, the gas is introduced into the flame-spraying pipe 12 and ignited, so that the temperature in the furnace body 1 rises, the motor is turned on through the controller after the temperature in the furnace body 1 reaches the preset temperature, the motor drives the circular pipe 2 to rotate, then the gear wheel 21 drives the gear ring to rotate, the part of the gear ring above the nitriding agent solution is quickly heated and then rotates into the nitriding agent solution, at this time, nitrogen is blown into the nitriding tank 14 through the air feed pipe 15, so that the nitriding agent rolls and finishes the nitriding operation of the gear ring by matching with the nitrogen, the gear 21 drives the gear ring to rotate, so that the gear ring is rapidly heated in the furnace body 1, the temperature rise speed of the gear ring is further improved, and the nitriding quality and efficiency of the gear ring are further improved; when the gear 21 drives the gear ring to rotate and simultaneously carry out nitriding operation in the nitriding tank 14, gas is introduced into the circular tube 2, so that the gas is sprayed out after passing through the circular tube 2, the blind hole 22 and the first hole 23, and the gas sprayed out of the first hole 23 is ignited to rapidly heat the gear ring passing through the gear 21, so that the utilization rate of the gas is further improved, the heating efficiency of the gear ring is increased, the gas is further saved, and the nitriding quality and efficiency of the gear ring are further increased; when the gear 21 rotates, the sliding block 24 is rotatably connected with the blind hole 22, the sliding block 24 is always positioned at the bottom of the blind hole 22 under the action of self gravity, and then the sliding block 24 prevents gas from being sprayed out of the first hole 23 below the gear 21, so that the gas can be sprayed out of the first hole 23 above the gear 21 and close to one side of the gear ring only, the gear ring is heated, the utilization rate of the gas is further improved, and the nitriding quality and the nitriding efficiency of the gear ring are further improved; because the tooth height of the gear 21 is larger than that of the gear ring, and the tooth thickness of the gear 21 is smaller than that of the gear ring, the fuel gas sprayed from the first hole 23 is fully combusted in the gap between the gear 21 and the gear ring, the heating effect of the heat generated by fuel gas combustion on the gear ring is further improved, the fuel gas is further saved, and the nitriding quality and efficiency of the gear ring are improved; the groove 25 is matched with the first hole 23 formed in the bottom of the groove 25, so that the combustion efficiency of gas sprayed from the first hole 23 is further improved, the blocking of the gear ring to the gas sprayed from the first hole 23 is reduced, the gas rushes in the gap between the groove 25 and the gear 21 and the gear ring to burn and release the heat of milk powder, the heating efficiency of gas combustion to the gear ring is further improved, and the nitriding quality and efficiency of the gear ring are improved; through shoulder pad 26 cooperation gear 21, further reduce the probability that the ring gear rotates the in-process and drops from gear 21, guarantee ring gear nitriding operation and normally go on, simultaneously, the second hole 27 of seting up on the shoulder pad 26 can carry out abundant heating to the ring gear side, further improve the heating efficiency of ring gear, because the diameter of second hole 27 reduces along the outside direction of shoulder pad 26 radius gradually, make the inside position heating effect that is close to the ring gear be greater than the outside heating effect of ring gear, and then make the temperature of the inboard addendum of ring gear be higher than the temperature of dedendum, carry out good carburization effect at the addendum, make the nitriding of dedendum department less when increasing flank hardness and stand wear resistance, increase the toughness of dedendum department, reduce disconnected tooth, thereby further increase the life of ring gear, further increase the quality and the efficiency of ring gear nitriding.
The front, the back, the left, the right, the upper and the lower are all based on the figure 2 in the attached drawings of the specification, according to the standard of the observation angle of a person, the side of the device facing an observer is defined as the front, the left side of the observer is defined as the left, and the like.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A surface treatment process for a gear ring of a gearbox is characterized by comprising the following steps: the method comprises the following steps:
s1, finishing: performing gear shaping finish machining on the gear ring blank by using a gear shaping machine to obtain a gear ring of the gearbox;
s2, first cleaning: putting a gear ring of a gearbox into a cleaning pool for cleaning, wherein the temperature in the cleaning pool is 60-70 ℃;
s3, preheating: placing the gear ring of the gearbox into an air furnace for preheating treatment, wherein the temperature in the air furnace is 380 ℃, and the temperature is maintained for 40 minutes;
s4, carburizing and nitriding: putting the gear ring of the gearbox into a nitriding furnace for nitriding and carburizing, wherein the temperature in the nitriding furnace is 565 ℃, and the temperature is maintained for 3.5 hours;
s5, oxidation treatment: putting the gear ring of the gearbox into an oxidation furnace for oxidation treatment, wherein the temperature in the oxidation furnace is 420 ℃, and the temperature is maintained for 1 hour;
s6, secondary cleaning: putting the gear box gear ring into a cleaning pool for cleaning, wherein the temperature in the cleaning pool is 40-50 ℃, soaking and cleaning for 20 minutes, then polishing the surface of the gear box gear ring, and finally soaking the gear box gear ring in oil to prevent the gear box gear ring from being oxidized;
the nitriding furnace adopted by the invention comprises a cylindrical furnace body (1); a group of foot supports (11) are uniformly distributed on the circumference of the bottom of the furnace body (1), a group of fire spraying pipes (12) are uniformly distributed on the circumference of the bottom of the furnace body (1), the fire spraying pipes (12) penetrate through the furnace body (1) and extend into the furnace body (1), and the fire spraying pipes (12) are communicated with fuel gas through valves; one side of the furnace body (1) is provided with a furnace door (13), and the furnace door (13) is used for loading or taking out the gear ring; a nitriding tank (14) is arranged at the center of the bottom inside the furnace body (1), and a nitriding agent solution is filled in the nitriding tank (14); an air feed pipe (15) communicated with an external nitrogen tank is arranged at the bottom of the nitriding tank (14); the top of the furnace body (1) is provided with an exhaust pipe (16), and the exhaust pipe (16) is communicated with a tail gas treatment device; the middle part of the furnace body (1) is rotatably connected with a round pipe (2), the round pipe (2) is driven to rotate by a motor fixed on the outer wall of the furnace body (1), and the motor is connected with a power supply through a controller; one end of the circular tube (2) close to the middle part of the furnace body (1) is fixedly connected with a gear (21), the gear (21) is engaged with a gear ring to be processed, and the bottom of the gear ring is soaked in a nitriding agent solution; the gear (21) is driven to rotate by the motor, so that the gear ring is driven to rotate, the temperature of the gear ring immersed in the nitriding agent solution is increased, and the nitriding quality and efficiency of the gear ring are increased.
2. The surface treatment process for the gear ring of the gearbox according to claim 1, wherein the surface treatment process comprises the following steps: the middle part of the gear (21) is provided with a blind hole (22) communicated with the circular tube (2); the circular tube (2) is internally communicated with gas; a group of first holes (23) are uniformly distributed on the circumference of the tooth top of the gear (21), and the first holes (23) are communicated with the blind holes (22); the gas in the circular tube (2) is sprayed out from the first hole (23) and is combusted, so that the heating efficiency of the gear ring is further increased, and the nitriding quality and efficiency of the gear ring are further increased.
3. The surface treatment process for the gear ring of the gearbox according to claim 2, wherein the surface treatment process comprises the following steps: the blind hole (22) is connected with a sliding block (24) with a semicircular cross section in a rotating mode, gas is sprayed out from a first hole (23) in the upper portion of the gear (21) through blocking of the sliding block (24), the gas using amount is further reduced, and the nitriding quality and the nitriding efficiency of the gear ring are further improved.
4. The surface treatment process for the gear ring of the gearbox according to claim 3, wherein the surface treatment process comprises the following steps: the tooth height of gear (21) is greater than the tooth height of ring gear, and the tooth thickness of gear (21) is less than the tooth thickness of ring gear, makes things convenient for the gas of a hole (23) blowout to fully burn, further increases the heating efficiency of ring gear to further increase the quality and the efficiency of ring gear nitriding.
5. The surface treatment process for the gear ring of the gearbox according to claim 4, wherein the surface treatment process comprises the following steps: a group of grooves (25) are uniformly arranged on the tooth tops of the gears (21); the first hole (23) is positioned at the bottom of the groove (25); through recess (25) cooperation No. one hole (23), further reduce the ring gear and to blockking of No. one hole (23) spun gas, further increase the heating efficiency to the ring gear after the gas burning to further increase the quality and the efficiency of ring gear nitriding.
6. The surface treatment process for the gear ring of the gearbox according to claim 5, wherein the surface treatment process comprises the following steps: circular shoulder protectors (26) are arranged on two sides of the gear (21), the shoulder protectors (26) are matched with the gear (21) to form a structure with an H-shaped cross section, and therefore falling off of the gear (21) in the rotation process of the gear ring is reduced; a group of second holes (27) are uniformly distributed on the circumference of one side, close to the gear (21), of the shoulder protector (26), and the second holes (27) are communicated with the blind holes (22); the diameter of the second hole (27) is gradually reduced along the outward direction of the radius of the shoulder pad (26), so that the temperature of the gear ring is gradually reduced from the tooth top to the tooth bottom, the toughness of the tooth bottom of the gear ring is increased, and the nitriding quality and efficiency of the gear ring are further increased.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911090452.2A CN110791728A (en) | 2019-11-08 | 2019-11-08 | Surface treatment process for gear ring of gearbox |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911090452.2A CN110791728A (en) | 2019-11-08 | 2019-11-08 | Surface treatment process for gear ring of gearbox |
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| Publication Number | Publication Date |
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| CN110791728A true CN110791728A (en) | 2020-02-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911090452.2A Withdrawn CN110791728A (en) | 2019-11-08 | 2019-11-08 | Surface treatment process for gear ring of gearbox |
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| CN (1) | CN110791728A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112210656A (en) * | 2020-10-17 | 2021-01-12 | 屈学伟 | Heat treatment device for piston ring machining |
| CN112981307A (en) * | 2021-02-07 | 2021-06-18 | 南京宇能机械有限公司 | 42CrMoA wind power gear ring nitriding process and equipment |
| US11365688B2 (en) | 2020-08-04 | 2022-06-21 | G.E. Avio S.r.l. | Gearbox efficiency rating for turbomachine engines |
| US11401829B2 (en) | 2020-08-04 | 2022-08-02 | Ge Avio S.R.L. | Gearbox efficiency rating for turbomachine engines |
| US11466624B1 (en) | 2022-01-31 | 2022-10-11 | Ge Avio S.R.L. | Overall engine efficiency rating for turbomachine engines |
| US11473507B2 (en) | 2020-08-04 | 2022-10-18 | Ge Avio S.R.L. | Gearbox efficiency rating for turbomachine engines |
| US11486312B2 (en) | 2020-08-04 | 2022-11-01 | Ge Avio S.R.L. | Gearbox efficiency rating for turbomachine engines |
| US11732655B2 (en) | 2021-01-22 | 2023-08-22 | Ge Avio S.R.L. | High-efficiency epicyclic gear assemblies for turbomachines and method of manufacturing thereof |
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2019
- 2019-11-08 CN CN201911090452.2A patent/CN110791728A/en not_active Withdrawn
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11365688B2 (en) | 2020-08-04 | 2022-06-21 | G.E. Avio S.r.l. | Gearbox efficiency rating for turbomachine engines |
| US11401829B2 (en) | 2020-08-04 | 2022-08-02 | Ge Avio S.R.L. | Gearbox efficiency rating for turbomachine engines |
| US11473507B2 (en) | 2020-08-04 | 2022-10-18 | Ge Avio S.R.L. | Gearbox efficiency rating for turbomachine engines |
| US11486312B2 (en) | 2020-08-04 | 2022-11-01 | Ge Avio S.R.L. | Gearbox efficiency rating for turbomachine engines |
| US11578666B2 (en) | 2020-08-04 | 2023-02-14 | Ge Avio S.R.L. | Gearbox efficiency rating for turbomachine engines |
| US11708794B2 (en) | 2020-08-04 | 2023-07-25 | Ge Avio S.R.L. | Gearbox efficiency rating for turbomachine engines |
| US11802516B2 (en) | 2020-08-04 | 2023-10-31 | Ge Avio S.R.L. | Gearbox efficiency rating for turbomachine engines |
| CN112210656A (en) * | 2020-10-17 | 2021-01-12 | 屈学伟 | Heat treatment device for piston ring machining |
| US11732655B2 (en) | 2021-01-22 | 2023-08-22 | Ge Avio S.R.L. | High-efficiency epicyclic gear assemblies for turbomachines and method of manufacturing thereof |
| CN112981307A (en) * | 2021-02-07 | 2021-06-18 | 南京宇能机械有限公司 | 42CrMoA wind power gear ring nitriding process and equipment |
| US11466624B1 (en) | 2022-01-31 | 2022-10-11 | Ge Avio S.R.L. | Overall engine efficiency rating for turbomachine engines |
| US11713721B1 (en) | 2022-01-31 | 2023-08-01 | Ge Avio S.R.L. | Overall engine efficiency rating for turbomachine engines |
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