CN112981309A

CN112981309A - 18CrNiMo7-6 wind power gear carburizing process and equipment

Info

Publication number: CN112981309A
Application number: CN202110176285.4A
Authority: CN
Inventors: 徐飞
Original assignee: Nanjing Yuneng Machinery Co ltd
Current assignee: Nanjing Yuneng Machinery Co ltd
Priority date: 2021-02-07
Filing date: 2021-02-07
Publication date: 2021-06-18

Abstract

The application relates to 18CrNiMo7-6 wind power gear carburizing process and equipment, wherein the carburizing process sequentially comprises the following steps: s1: temperature equalization; s2: strong permeation and diffusion; s3: preserving heat; s4: high-temperature tempering; s5: discharging and putting down; the steps S1, S2 and S3 comprise a carbon potential adjusting step; the carbon potential regulation comprises the following steps: detecting the temperature, the carbon monoxide content and the oxygen partial pressure in the carbon-containing atmosphere in real time, controlling the carbon potential of the step S1 to be 0.70-0.85, the carbon potential of the step S2 to be 0.75-1.18 and the carbon potential of the step S3 to be 0.70-0.85. The method can better regulate and control the carbon potential in the furnace, and further improve the mechanical property of the workpiece.

Description

18CrNiMo7-6 wind power gear carburizing process and equipment

Technical Field

The application relates to the field of heat treatment, in particular to 18CrNiMo7-6 wind power gear carburizing technology and equipment.

Background

18CrNiMo7-6 is alloy steel, and the chemical components are as follows: c: 0.15 to 0.21%, Si: 0.40%, Mn: 0.50-0.90%, less than 0.035% of phosphorus and sulfur, Cr: 1.50-1.80%, Ni: 1.40-1.70%, Mo: 0.25-0.35%, and finally, in the machining process of the 18CrNiMo7-6 workpiece, a carburizing operation is usually required to be utilized to improve the mechanical property of the workpiece.

Carburizing is one of the main processes of chemical heat treatment, and is mainly characterized in that a low-carbon steel piece is heated to an austenite state in a carburizing medium and is subjected to heat preservation, so that carbon atoms permeate into the surface of the low-carbon steel piece, and the low-carbon steel piece can obtain certain surface carbon content and carbon concentration, thereby greatly improving the mechanical properties of the low-carbon steel piece, such as hardness and the like; the carbon potential is an important performance parameter in the carburizing process, determines the strength factor of the carbon transfer direction and limit, and reflects the capability of carbon to transfer from one phase to another phase.

In the related art described above, the inventors believe that if a large variation occurs in the carbon potential during carburization, the final quality of the workpiece is affected because the carbon potential affects the carburization effect of the workpiece.

Disclosure of Invention

In order to better regulate and control the carbon potential in the furnace and further improve the mechanical property of a workpiece, the application provides a carburizing process and equipment for an 18CrNiMo7-6 wind power gear.

In a first aspect, the application provides a carburizing process for an 18CrNiMo7-6 wind power gear, which adopts the following technical scheme:

a18 CrNiMo7-6 wind power gear carburizing process sequentially comprises the following steps: s1: temperature equalization; s2: strong permeation and diffusion; s3: preserving heat; s4: high-temperature tempering; s5: discharging and putting down; the steps S1, S2, and S3 each include a carbon potential adjustment step:

the carbon potential regulation comprises the following steps:

detecting the temperature, the carbon monoxide content and the oxygen partial pressure in the carbon-containing atmosphere in real time, controlling the carbon potential of the step S1 to be 0.70-0.85, the carbon potential of the step S2 to be 0.75-1.18 and the carbon potential of the step S3 to be 0.70-0.85.

By adopting the technical scheme, the carbon potential of each step is controlled within a specified range, so that the surface of the workpiece has proper carbon concentration, and the hardness of the workpiece is improved; and in this application, oxygen partial pressure in temperature, carbon monoxide content and the carbon-containing atmosphere in the real-time detection stove, and then can know the interior carbon potential of stove in real time, also can adjust the gaseous input volume of carbon-containing and control the carbon potential trend to this application can carry out better regulation and control to the interior carbon potential of stove, further improves the carburization effect of work piece.

Optionally, the method further comprises an oxygen probe cleaning step: stopping the oxygen partial pressure detection work of the oxygen probe, and keeping the oxygen probe for a specified time by passing air into the oxygen probe; in the oxygen probe cleaning process, the carbon potential is set to be unchanged.

By adopting the technical scheme, the oxygen probe does not work in the cleaning process of the oxygen probe, and if carbon potential is not set, the carbon potential calculated by the control system is greatly reduced, so that more carbon-containing gas can be added into the control system to improve the carbon potential, the actual carbon potential can be greatly improved, and the surface of a workpiece is easily flayed; in the cleaning process of the oxygen probe, the carbon potential of the operating system is set to be unchanged, the actual carbon potential in the furnace only can be reduced, and the control system correspondingly increases the carbon-containing gas through a carbon potential reduction signal obtained by detection after the oxygen probe is restored to work, so that the final mechanical property of the workpiece is not influenced too much.

Optionally, after the step S2 is finished, the temperature in the furnace is forced to the temperature required in the step S3, and after the step S3 is finished, the workpiece is taken out of the furnace and enters a slow cooling pit for slow cooling.

By adopting the technical scheme, the internal stress of the workpiece can be released, so that the possibility of generating cracks on the workpiece is reduced.

In a second aspect, the application provides equipment for 18CrNiMo7-6 wind power gear carburizing process, which adopts the following technical scheme:

the utility model provides an equipment for 18CrNiMo7-6 wind-powered electricity generation gear carburization technology, includes furnace body, bell, even cover, intake pipe, oxygen probe, temperature-detecting device, CO infrared analyzer and fan, the bell is installed on the furnace body top, CO infrared analyzer, intake pipe, fan and oxygen probe all set up on the bell and are located the top of even cover, even cover and temperature-detecting device are all installed in the furnace body, even cover is used for the cover to establish in the week side of heat treatment work piece, even cover bottom opening and top are provided with even logical groove, still be provided with the subassembly of supplying gas on the oxygen probe, the subassembly of supplying gas is used for sending the gas of keeping away from intake pipe department to the sense terminal of oxygen probe.

By adopting the technical scheme, the workpiece is placed in the furnace body, and the uniform cover covers the periphery of the workpiece, so that the carbon-containing gas entering from the gas inlet pipe cannot directly contact the workpiece at the top end, but moves downwards under the action of the fan and enters the uniform cover from the bottom end of the uniform cover, and then flows upwards through the uniform through groove, so that the gas in the furnace body circularly flows in the furnace, and the workpiece can uniformly contact activated carbon atoms; simultaneously, the gas supply subassembly will keep away from the gas of intake pipe inlet end and send the sense terminal to the oxygen probe, what make the oxygen probe detect is evenly distributed in the carburizing furnace gas, the abundant reduction is because of the too high detection influence that causes of the carbon-containing gas concentration that the carburizing furnace got into in the twinkling of an eye, thereby improve the detection accuracy of oxygen probe, then the temperature in the temperature-detecting device real-time detection carburizing furnace, the carbon monoxide content in the infrared analyzer real-time supervision stove of CO, can calculate the carbon potential in the stove, and can adjust the carbon potential through the volume of letting in according to adjusting carbon-containing gas, thereby this application can carry out regulation and control better to the interior carbon potential of stove, and the product quality is improved.

Optionally, the air supply assembly comprises an air receiving box, an air supply pipe and an air supply fan, the air receiving box is arranged on the furnace cover, the top end of the air receiving box is provided with an inserting groove in a penetrating mode, the detection end of the oxygen probe extends into the air receiving box through the inserting groove, the air supply pipe is arranged on the furnace cover, the air outlet pipe is communicated with the air receiving box, the air inlet end of the air supply pipe extends to the position, away from the air inlet pipe, of the carburizing furnace matched with the carbon potential detection device, one side, away from the air supply pipe, of the air receiving box is provided with an air outlet in a penetrating mode, the air supply fan is arranged in the air supply pipe, and a driving piece used for driving the air supply fan to rotate is arranged in the air supply.

By adopting the technical scheme, the driving piece drives the air supply fan to rotate, so that air flow towards the direction of the air receiving box is formed in the air supply pipe, and the gas far away from the position of the air inlet end in the carburizing furnace is supplied to the detection end of the oxygen probe.

Optionally, the driving part comprises a driving shaft, a linkage shaft, a driving bevel gear and a reversing bevel gear, the driving shaft is fixedly connected with the axis of the fan, one end of the driving shaft, far away from the fan, extends into the air supply pipe, the driving bevel gear is fixedly arranged at one end of the driving shaft, extending into the air supply pipe, the linkage shaft is fixedly arranged at the axis of the air supply fan, the reversing bevel gear is fixedly connected with the linkage shaft, and the reversing bevel gear is meshed with the driving bevel gear and the driving bevel gear.

By adopting the technical scheme, the driving shaft can drive the driving bevel gear to rotate when the fan rotates, so that the driving bevel gear is meshed with the reversing bevel gear, the linkage shaft can drive the air supply fan to rotate, and the rotating fan can be used as a rotating power source of the air supply fan, so that the rotation of the air supply fan can be conveniently realized.

Optionally, a rotating rod is rotatably arranged on the lower surface of the air supply pipe, an auxiliary fan is arranged at one end of the rotating rod, the auxiliary fan is located in the uniform through groove, and a rotating part for driving the auxiliary fan to rotate is arranged on the air supply pipe; the rotating part comprises a linkage rotating disc, a linkage rotating rod, a first bevel gear and a second bevel gear, the air supply pipe comprises a first pipe and a second pipe, the first pipe is connected with the air receiving box, the linkage rotating disc is fixedly connected with the linkage shaft, the axial side wall of the linkage rotating disc is rotatably connected with one end, far away from the air receiving box, of the first pipe, one end of the second pipe is rotatably connected with the side wall, far away from the first pipe, of the linkage rotating disc, and one end, far away from the linkage rotating disc, of the second pipe extends to the position, far away from the air inlet pipe, of the carburizing furnace matched with the carbon potential detection device; the linkage rotating rod is rotatably arranged on the outer side wall of the air supply pipe, the linkage rotating disc is meshed with the linkage rotating rod, the first bevel gear is fixedly arranged on the peripheral wall of the linkage rotating rod, the second bevel gear is fixedly arranged on the peripheral wall of the rotating rod, and the first bevel gear is meshed with the second bevel gear.

By adopting the technical scheme, the linkage shaft can drive the linkage turntable to rotate, so that the linkage turntable drives the linkage rotating rod to rotate, the first bevel gear and the second bevel gear are meshed, the auxiliary fan can be driven to rotate, and the rotating fan is used as a rotating power source of the auxiliary fan, so that the auxiliary fan can be conveniently rotated; thereby when the carburizing furnace work, auxiliary fan rotates in even logical groove for even cover inboard has the air current from bottom to top, thereby cooperates the fan, makes to form more stable circulating air current in the carburizing furnace, makes gaseous more even in the carburizing furnace distribution, not only improves the detection accuracy of oxygen probe, can improve the carburization homogeneity moreover, improves product quality.

Optionally, the second pipe is including fixed pipe, connecting pipe and receipts trachea, fixed pipe rotates with the linkage carousel and is connected, it sets up on the furnace body inside wall and the axis is vertical to receive the trachea, the connecting pipe slides along vertical direction and sets up on the vertical inside wall of fixed pipe keeping away from the linkage carousel, fixed pipe and receipts trachea coaxial line, connecting pipe external diameter less than or equal to receives tracheal inside diameter, be provided with in the furnace body and put pipe fitting and receipts pipe fitting, the side pipe fitting is arranged in inserting the connecting pipe and receives the trachea, it is arranged in the fixed pipe of connecting pipe income to receive the pipe fitting.

By adopting the technical scheme, when the air supply pipe is placed into the furnace body, the connecting pipe is received in the fixed pipe, so that the impact on the related structure of the carburizing furnace is reduced; and the connecting pipe can be inserted into the air receiving pipe by the pipe placing part, so that the whole air feeding pipe works normally.

Optionally, the tube placing part comprises a bearing block, a limiting block, a first limiting ring, a second limiting ring and a shifting block, the bearing block is arranged on the inner wall of the fixed tube, the first limiting ring is arranged on the inner wall of the fixed tube and is positioned above the bearing block, the limiting block is arranged at the top end of the outer peripheral wall of the connecting tube, the second limiting ring is arranged at the bottom end of the inner peripheral wall of the fixed tube, the lower surface of the limiting block is abutted against the upper surface of the second limiting ring, the second limiting ring is abutted against the outer peripheral wall of the connecting tube, the shifting block is arranged on the inner side wall of the furnace body, a sliding groove is arranged at the bottom end of the outer peripheral wall of the connecting tube, a chute communicated with the sliding groove is arranged on the outer peripheral wall of the connecting tube, the top end of the chute is far away from the sliding groove along the circumferential direction of the connecting tube, a abdicating groove is arranged on the outer peripheral wall of the connecting tube, the abdicati, the connecting pipe is inserted in the fixed pipe.

Through taking above-mentioned technical scheme, in the inception, stopper upper surface and first spacing ring butt, stopper lower surface and overlap joint piece butt, fixed pipe drives when the connecting pipe enters into the furnace body and constantly moves down, the stirring piece can enter into the chute along the sliding-in groove, thereby receive the limiting displacement of first spacing ring, the connecting pipe can not shift up, and receive the direction of chute cell wall, the stirring piece can make the connecting pipe rotate, the stopper can move to the position of keeping away from the bearing piece this moment, the stirring piece is relative with the groove of stepping down, the connecting pipe can slide in fixed pipe and insert in the collecting pipe.

Optionally, receive the pipe fitting and include flexible head and expanding spring, the one end of dialling the piece towards even pipe is provided with flexible groove, flexible head slides and sets up on flexible groove cell wall, expanding spring sets up and stretches into between flexible inslot one end and the flexible groove cell wall at flexible head, be provided with the groove of sliding out on the even pipe periphery wall, slide out the groove top and step down the groove and communicate with each other, the groove of sliding out diminishes along keeping away from the direction of the groove of stepping down along even the radial degree of depth of pipe gradually.

Through adopting above-mentioned technical scheme, when fixed pipe drive connecting pipe shifts up and leaves the carburizing furnace, the flexible head can slide in the slip groove, receives the butt effect of slip groove cell wall, and flexible head compression expanding spring and stretch into flexible groove can make the stirring piece leave the connecting pipe, treat that the connecting pipe leaves the carburizing furnace, manual with the connecting pipe again receive fixed pipe can, convenient and fast.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the method has the advantages that the temperature, the carbon monoxide content and the oxygen partial pressure in the carbon-containing atmosphere in the furnace are detected in real time, the carbon potential in the furnace is known in real time, and meanwhile, the carbon potential trend can be controlled by adjusting the introduction amount of the carbon-containing gas, so that the carbon potential in the furnace can be better regulated and controlled, and the carburizing effect of the workpiece is further improved;

2. in the cleaning process of the oxygen probe, the carbon potential is set to be unchanged, so that the phenomenon that a large amount of carbon-containing gas is introduced into a control system due to sudden reduction of the carbon potential obtained by detection can be avoided, and further the surface peeling of a workpiece is reduced;

3. the application provides a device for a carburizing process, which can more accurately detect the oxygen partial pressure in a carbon-containing atmosphere in a furnace and further improve the accuracy of carbon potential regulation.

Drawings

Fig. 1 is a schematic view of the structure of an apparatus for a carburizing process in the embodiment of the present application.

Fig. 2 is a schematic structural diagram of a furnace body used for embodying the embodiment of the present application.

FIG. 3 is a plan view of the furnace body in the example of the present application.

Fig. 4 is a sectional view taken along line a-a of fig. 3.

Fig. 5 is an enlarged view at B in fig. 4.

Fig. 6 is an enlarged view at C in fig. 4.

Fig. 7 is a partial cross-sectional view of a tube fitting structure embodying the embodiments of the present application.

Description of reference numerals: 1. a furnace body; 11. a furnace cover; 12. cushion blocks; 13. a uniform cover; 131. a uniform through groove; 14. moving the travelling crane; 141. a moving track; 142. a moving wheel; 143. a first driving device; 15. a cable; 151. a lifting screw; 152. a second driving device; 2. an air inlet pipe; 21. a CO infrared analyzer; 3. an oxygen probe; 4. a temperature detection device; 5. a fan; 6. an air supply assembly; 61. a gas receiving box; 611. inserting into a groove; 612. an air outlet; 62. an air supply pipe; 621. a first tube; 6211. connecting blocks; 622. a second tube; 6221. a fixed tube; 6222. connecting pipes; 6223. a gas collecting pipe; 623. extending into the groove; 63. an air supply fan; 64. a drive member; 641. a drive shaft; 642. a linkage shaft; 643. a drive bevel gear; 644. a reversing bevel gear; 7. rotating the rod; 71. an auxiliary fan; 72. a rotating member; 721. a linkage turntable; 7221. a vent; 722. a linkage rotating rod; 723. a first bevel gear; 724. a second bevel gear; 8. placing pipe fittings; 81. a bearing block; 82. a limiting block; 83. a first limit ring; 84. a second stop collar; 85. a shifting block; 851. a telescopic groove; 86. sliding into the groove; 87. a chute; 88. a yielding groove; 9. collecting pipe fittings; 91. a telescopic head; 92. a tension spring; 93. and sliding out of the groove.

Detailed Description

The present application is described in further detail below with reference to figures 1-7.

The embodiment of the application discloses equipment for a carburizing process.

As shown in fig. 1 and 2, an apparatus for a carburizing process comprises a furnace body 1 and a furnace cover 11 installed at the top end of the furnace body 1, wherein the bottom end of the furnace body 1 is located underground, but the top end is located above the ground, moving rails 141 are installed at positions on the ground located at both sides of the furnace body 1, a moving trolley 14 slides on the moving rails 141, a moving wheel 142 is rotatably connected to the bottom end of the moving trolley 14, and a first driving device 143 for driving the moving wheel 142 to roll on the moving rails 141 is also installed on the moving trolley 14; meanwhile, a horizontal arm of the mobile crane 14 is positioned above the furnace body 1, four guys 15 are uniformly distributed on the upper surface of the furnace cover 11, the top ends of the guys 15 are rotatably connected with a lifting screw 151, the lifting screw 151 is in threaded connection with the horizontal arm of the mobile crane 14, and a second driving device 152 for driving the lifting screw 151 to rotate is installed at the top end of the mobile crane 14. The second driving device 152 is started, so that the lifting screw 151 pulls up the furnace cover 11 by means of thread feeding, the furnace cover 11 can be opened, then the first driving device 143 is started, the moving travelling crane 14 is made to drive the furnace cover 11 to be far away from the upper part of the furnace body 1, feeding can be carried out on the furnace body 1, finally the moving travelling crane 14 is used for driving the furnace cover 11 to be back to the upper part of the furnace body 1, the lifting screw 151 is made to drive the furnace cover 11 to move downwards to cover the top end of the furnace body 1, and the furnace cover 11 can be tightly covered at the top end

As shown in fig. 3 and 4, in the present embodiment, a cushion block 12 is installed on the bottom wall of the furnace body 1, during the heat treatment process, an even cover 13 with an open bottom end is further placed in the furnace body 1, and an even through groove 131 is further penetratingly arranged on the top wall of the even cover 13. Starting the second driving device 152 to enable the lifting screw 151 to pull up the furnace cover 11 by means of screw feeding, then starting the first driving device 143 to enable the moving travelling crane 14 to drive the furnace cover 11 to be far away from the upper part of the furnace body 1, adding a workpiece into the furnace body 1 at the moment, then placing the uniform cover 13 into the furnace body 1 to enable the uniform cover 13 to be located on the cushion block 12, forming an opening between the uniform cover 13 and the inner bottom wall of the furnace body 1, and meanwhile covering the workpiece on the inner side of the uniform cover 13; and then the furnace cover 11 is brought back to the upper part of the furnace body 1 by the moving travelling crane 14, so that the lifting screw 151 drives the furnace cover 11 to move downwards to cover the top end of the furnace body 1, the furnace body 1 and the furnace cover 11 are tightly covered, and then heat treatment is carried out.

As shown in fig. 4, the apparatus for carburizing process further includes an air inlet pipe 2, a CO infrared analyzer 21, an oxygen probe 3, a temperature detection device 4 and a fan 5, wherein the CO infrared analyzer 21, the fan 5 and the oxygen probe 3 are all installed on the furnace cover 11 and located above the uniform cover 13, the furnace cover 11 is further connected with the air inlet pipe 2, the rotation axis of the fan 5 is vertical, an air supply assembly 6 is further arranged in the furnace body 1, and the air supply assembly 6 is used for supplying gas far away from the air inlet pipe 2 to the detection end of the oxygen probe 3. The temperature detection device 4 is installed on the side wall of the furnace body 1. In the heat treatment process, carbon-containing gas enters the furnace body 1 through the gas inlet pipe 2, the carbon-containing gas in the embodiment is methanol, the methanol flows to the bottom wall of the furnace body 1 under the blowing of the fan 5 and enters the uniform cover 13, and then the methanol is discharged through the uniform through groove 131, so that the circulation of the gas in the furnace body 1 is realized, and the workpieces in the uniform cover 13 uniformly contact with activated carbon atoms; in the process, the temperature detection device 4 detects the temperature in the furnace body 1 in real time, the CO infrared analyzer 21 detects the amount of carbon monoxide in the furnace body 1 in real time, meanwhile, the gas feeding assembly 6 feeds the gas far away from the inlet end of the gas inlet pipe 2 to the detection end of the oxygen probe 3, the oxygen probe 3 detects the oxygen partial pressure of the gas which is distributed uniformly in the furnace body 1, and the final control system can calculate the carbon potential in the furnace through the temperature, the oxygen partial pressure and the amount of carbon monoxide.

As shown in fig. 4 and 5, the gas supply assembly 6 in the present embodiment includes a gas receiving box 61, a gas supply pipe 62 and a gas supply fan 63, wherein an insertion groove 611 is formed through a top end of the gas receiving box 61, a detection end of the oxygen probe 3 extends into the gas receiving box 61 through the insertion groove 611, the gas supply pipe 62 is fixed on the furnace cover 11, an outlet end of the gas supply pipe 62 is communicated with the gas receiving box 61, an inlet end of the gas supply pipe 62 extends to a bottom end of a vertical inner side wall of the furnace body 1, a gas outlet 612 is formed through a side of the gas receiving box 61 away from the gas supply pipe 62, the gas supply fan 63 is rotatably disposed in the gas supply pipe 62, and a driving member 64 for driving the gas supply fan 63 to rotate is disposed in the gas. The driving member 64 drives the air supply fan 63 to rotate, so that the gas far away from the air inlet pipe 2 in the furnace body 1 enters the air receiving box 61 through the air supply pipe 62, then the oxygen probe 3 performs oxygen partial pressure detection, and finally the gas in the air receiving box 61 is discharged through the air outlet 612.

As shown in fig. 4 and fig. 5, the driving member 64 includes a driving shaft 641, a linkage shaft 642, a driving bevel gear 643 and a reversing bevel gear 644, the top end of the driving shaft 641 is fixedly connected with the axial center of the fan 5, and the sidewall of the air feeding pipe 62 opposite to the driving shaft 641 is provided with an extending groove 623 in a penetrating manner; the bottom end of the driving shaft 641 extends into the air supply pipe 62 through the extending groove 623, and the driving shaft 641 is rotatably connected with the groove wall of the extending groove 623; the driving bevel gear 643 is fixedly arranged at the bottom end of the driving shaft 641, the linkage shaft 642 is rotatably arranged in the air feeding pipe 62 and is fixedly connected with the axis of the air feeding fan 63, the reversing bevel gear 644 is fixedly connected with the linkage shaft 642, and the reversing bevel gear 644 is meshed with the driving and driving bevel gear 643. Therefore, when the fan 5 is started, the driving shaft 641 drives the driving bevel gear 643 to rotate, the driving bevel gear 643 is meshed with the linkage bevel gear, and the linkage shaft 642 can drive the air supply fan 63 to rotate.

As shown in fig. 5, the lower surface of the pipe body above the uniform cover 13 of the air supply pipe 62 is rotatably provided with a rotating rod 7, the axis of the rotating rod 7 is horizontally and rotatably provided with an auxiliary fan 71, the axis of the auxiliary fan 71 is vertical and is in one-to-one correspondence with the uniform through grooves 131, the auxiliary fan 71 is located in the uniform through grooves 131, and the air supply pipe 62 is provided with a rotating member 72 for driving the auxiliary fan 71 to rotate.

As shown in fig. 5 and fig. 6, in this embodiment, the first pipe 621 includes a first closing pipe and a second pipe 622, an air outlet end of the second pipe 622 is connected to an air inlet end of the first pipe 621, an air outlet end of the first pipe 621 is connected to the air receiving box 61, the driving shaft 641, the linkage shaft 642 and the air supply fan 63 are all installed on the first pipe 621, and an end of the second pipe 622 far away from the first pipe 621 extends to a bottom end of an inner peripheral wall of the furnace body 1. The rotating member 72 in this embodiment includes a linkage rotary disc 721, a linkage rotary rod 722, a first bevel gear 723 and a second bevel gear 724, the linkage rotary disc 721 is located between the first pipe 621 and the second pipe 622, the first pipe 621 and the second pipe 622 are both rotationally connected with the axial side wall of the linkage rotary disc 721, the circumferential wall of the linkage rotary disc 721 is located outside the first pipe 621 and the second pipe 622, the linkage rotary disc 721 is located on the side wall inside the first pipe 621 and the second pipe 622 and is provided with a vent 7221 in a penetrating manner, and the linkage rotary disc 721 is fixedly connected with the linkage shaft 642; two opposite connecting blocks 6211 are arranged on the outer side wall of the first pipe 621, the linkage rotating rod 722 is rotatably arranged between the two connecting blocks 6211 and is positioned below the first pipe 621, the linkage rotating disk 721 is meshed with the linkage rotating rod 722, the first bevel gear 723 is fixedly arranged on the peripheral wall of the linkage rotating rod 722, the second bevel gear 724 is fixedly arranged on the peripheral wall of the rotating rod 7, and the first bevel gear 723 is meshed with the second bevel gear 724. When the linkage shaft 642 rotates, the linkage turntable 721 can be driven to be engaged with the linkage rotating rod 722, so that the first bevel gear 723 is engaged with the second bevel gear 724, and the auxiliary fan 71 rotates in the uniform through groove 131, so that the air in the uniform cover 13 flows upwards out of the uniform cover 13 through the uniform through groove 131.

As shown in fig. 5 and 6, in the present embodiment, the second pipe 622 includes a fixed pipe 6221, a connecting pipe 6222, and an air collecting pipe 6223, the fixed pipe 6221 is rotatably connected to the linkage turntable 721 and fixed on the furnace cover 11, one end of the fixed pipe 6221 away from the linkage turntable 721 is bent downward, the air collecting pipe 6223 is installed in the furnace body 1, the axis of the air collecting pipe 6223 is vertical, the connecting pipe 6222 is slidably disposed on a vertical inner side wall of the fixed pipe 6221 away from the linkage turntable 721 along the vertical direction, the fixed pipe 6221 and the air collecting pipe 6223 are coaxial, the outer diameter of the connecting pipe 6222 is equal to the inner diameter of the air collecting pipe 6223, a pipe placing part 8 and a pipe collecting part 9 are disposed in the furnace body 1, the pipe placing part 8 is used for inserting the connecting pipe 6222 into the air collecting pipe 6223, and the air collecting part 9 is used for collecting the connecting. In the process of covering the furnace cover 11 on the furnace body 1, the connecting tube 6222 moves downwards along with the fixed tube 6221, when the furnace cover 11 is just to be seated on the furnace cover 11, the tube-discharging member 8 discharges the connecting tube 6222 from the fixed tube 6221, the connecting tube 6222 slides downwards and is inserted into the air-collecting tube 6223, and the whole air-sending tube 62 works normally; when the carburizing furnace is used for blanking, the pipe collecting piece 9 separates the connecting pipe 6222 from the fixed pipe 6221, and the furnace cover 11 smoothly leaves the furnace body 1.

As shown in fig. 6 and 7, the pipe placing part 8 includes a bearing block 81, a limiting block 82, a first limiting ring 83, a second limiting ring 84 and a toggle block 85, the bearing block 81 is integrally connected to the vertical inner pipe wall of the fixed pipe 6221, the first limiting ring 83 is integrally connected to the vertical inner pipe wall of the fixed pipe 6221 and located above the bearing block 81, the limiting block 82 is integrally connected to the top end of the outer peripheral wall of the connecting pipe 6222, when the connecting pipe 6222 is received in the fixed pipe 6221, the lower surface of the limiting block 82 abuts against the upper surface of the bearing block 81, and the upper surface of the limiting block 82 abuts against the lower surface of the first limiting ring 83; the second limit ring 84 is arranged at the bottom end of the inner peripheral wall of the fixed tube 6221, and the second limit ring 84 is abutted against the outer peripheral wall of the connecting tube 6222, so that the second limit ring 84 is opposite to the limit block 82 in the vertical direction.

As shown in fig. 6 and 7, the shifting block 85 is integrally connected to the inner side wall of the furnace body 1, a sliding groove 86, a chute 87 and a yielding groove 88 are formed in the outer peripheral wall of the connecting tube 6222, the bottom end of the sliding groove 86 penetrates through the connecting tube 6222 in the vertical direction, the width of the bottom end of the sliding groove 86 along the circumferential direction of the connecting tube 6222 is smaller than that of the shifting block 85 along the circumferential direction of the connecting tube 6222, the bottom end of the chute 87 is communicated with the top end of the sliding groove 86, the top end of the chute 87 is far away from the sliding groove 86 along the circumferential direction of the connecting tube 6222, and the yielding groove 88 is communicated. When the furnace cover 11 is to be located on the furnace cover 11, the shifting block 85 enters the sliding-in groove 86 from the bottom end of the sliding-in groove 86, moves downwards along with the furnace cover 11, the shifting block 85 slides into the chute 87, is limited by the wall of the chute 87 at the moment, and the shifting block 85 enables the connecting pipe 6222 to rotate, so that the limiting block 82 rotates to a position far away from the bearing block 81, the shifting block 85 is opposite to the abdicating groove 88, the connecting pipe 6222 can slide downwards until the limiting block 82 abuts against the second limiting ring 84, and the connecting pipe 6222 is inserted into the gas collecting pipe 6223.

As shown in fig. 6 and 7, the pipe receiving member 9 includes a telescopic head 91 and a telescopic spring 92, one end of the toggle block 85 facing the connecting pipe 6222 is provided with a telescopic groove 851, the telescopic head 91 is slidably disposed on a groove wall of the telescopic groove 851 along the horizontal direction, the telescopic spring 92 is fixedly connected between one end of the telescopic head 91 extending into the telescopic groove 851 and a groove wall of the telescopic groove 851, a sliding-out groove 93 is disposed on the outer circumferential wall of the connecting pipe 6222, the top end of the sliding-out groove 93 is communicated with the abdicating groove 88, the depth of the sliding-out groove 93 along the radial direction of the connecting pipe 6222 is gradually reduced along the direction away from the abdicating groove 88, the width of the bottom end of the sliding-out groove 93 along the circumferential direction of the connecting pipe 6222 is smaller than the width of the telescopic head 91 along the circumferential direction of the connecting pipe 6222, and the width of the bottom end. In the process of the lower anti-furnace cover 11, the telescopic head 91 slides in the slide-in groove 86, the inclined groove 87 and the abdicating groove 88, and the telescopic spring 92 is in a natural state; when the furnace cover 11 moves upwards, the telescopic head 91 enters the sliding-out groove 93 from the abdicating groove 88, is limited by the groove wall of the sliding-out groove 93, the telescopic spring 92 is compressed, the telescopic head 91 enters the telescopic groove 851 until the telescopic head 91 is far away from the connecting pipe 6222, and the furnace cover 11 smoothly leaves.

The application also provides a 18CrNiMo7-6 wind power gear carburizing process.

A18 CrNiMo7-6 wind power gear carburizing process comprises the following steps:

the workpiece and the uniform cover 13 are placed in the furnace body 1, the furnace cover 11 is covered, in the process, the connecting pipe 6222 is inserted into the air receiving pipe 6223, then the fan 5 is started, the air supply fan 63 and the auxiliary fan 71 are rotated, then air is introduced from the air inlet pipe 2, and the furnace pressure is maintained at 0.3-0.6 KPa.

S1: temperature equalization; firstly, blowing the furnace body for 1 four hours at 660 ℃, wherein the nitrogen flow is 5.5 cubic meters per hour; then heating, adding methanol at 740 deg.C, the flow ratio of nitrogen and methanol is 1.1:1, heating to 865 deg.C, and maintaining the carbon potential at 0.81 + -0.05 for 2.5 hr.

S2: strong permeation and diffusion: raising the temperature to 935 ℃, and preserving the temperature for 92 hours, wherein the carbon potential is maintained at 1.1 +/-0.05.

S3: preserving heat; and (3) carrying out forced cooling to 830 ℃, preserving the temperature for 2.5 hours, maintaining the carbon potential at 0.8 +/-0.05, then discharging the workpiece, transferring the workpiece into a slow cooling pit, and carrying out slow cooling for 3 hours.

S4: high-temperature tempering; and (3) putting the workpiece back into the furnace body 1, introducing nitrogen into the furnace body 1, and keeping the temperature at 660 ℃ for hours.

S5: discharging and putting down; and (4) discharging the workpiece, transferring the workpiece into a slow cooling pit, slowly cooling for 3 hours, and then air cooling.

In steps S1, S2, and S3, the temperature detection device 4 detects the temperature in the furnace body 11 in real time, the CO infrared analyzer 21 detects the amount of carbon monoxide in the furnace body 1 in real time, the oxygen probe 3 detects the oxygen partial pressure of the gas in the furnace body 1 in real time, the final control system can calculate the carbon potential in the furnace through the temperature, the oxygen partial pressure, and the amount of carbon monoxide, and if the deviation of the carbon potential is too large, the regulation and control are performed by adjusting the methanol introduction amount.

Meanwhile, in the carburization process, the operation of the oxygen probe 3 is stopped at regular time, and air is introduced into the oxygen probe 3, so that carbon black attached to the oxygen probe 3 generates carbon dioxide or carbon monoxide at high temperature and is removed, in the embodiment, the cleaning time of the oxygen probe 3 is one minute, and in the cleaning process of the oxygen probe 3, the carbon potential displayed by the control system is set to be a fixed value.

The gear workpiece processed by the embodiment of the application has the tooth crest hardness HRC of 64 and the tooth core hardness HRC of 45, and has no oxide skin and collision on the surface.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A18 CrNiMo7-6 wind power gear carburizing process is characterized in that: the method sequentially comprises the following steps: s1: temperature equalization; s2: strong permeation and diffusion; s3: preserving heat; s4: high-temperature tempering; s5: discharging and putting down; the steps S1, S2 and S3 comprise a carbon potential adjusting step;

the carbon potential regulation comprises the following steps:

2. The 18CrNiMo7-6 wind power gear carburizing process according to claim 1, characterized in that: the method also comprises the following cleaning steps of the oxygen probe (3): stopping the oxygen partial pressure detection work of the oxygen probe (3), and keeping the oxygen probe (3) for a specified time by passing air; and in the cleaning process of the oxygen probe (3), setting the carbon potential to be unchanged.

3. The 18CrNiMo7-6 wind power gear carburizing process according to claim 1, characterized in that: after the step S2 is finished, the temperature in the furnace is forced to be cooled to the temperature required by the step S3, and after the step S3 is finished, the workpiece is taken out of the furnace and enters a slow cooling pit for slow cooling.

4. The equipment for 18CrNiMo7-6 wind power gear carburizing process according to claim 1 is characterized in that: comprises a furnace body (1), a furnace cover (11), a uniform cover (13), an air inlet pipe (2), a CO infrared analyzer (21), an oxygen probe (3), a temperature detection device (4) and a fan (5), the furnace cover (11) is arranged at the top end of the furnace body (1), the CO infrared analyzer (21), the air inlet pipe (2), the fan (5) and the oxygen probe (3) are all arranged on the furnace cover (11) and are positioned above the uniform cover (13), the uniform cover (13) and the temperature detection device (4) are both arranged in the furnace body (1), the uniform cover (13) is used for covering the periphery of the heat treatment workpiece, the bottom end of the uniform cover (13) is opened, the top end of the uniform cover is provided with a uniform through groove (131), the oxygen probe (3) is further provided with an air supply assembly (6), and the air supply assembly (6) is used for supplying gas far away from the air inlet pipe (2) to the detection end of the oxygen probe (3).

5. The equipment for 18CrNiMo7-6 wind power gear carburizing process according to claim 4, characterized in that: the utility model discloses a heating furnace, including the furnace body, send out gas subassembly (6) including receiving gas box (61), pipe (62) and send out gas fan (63), receive gas box (61) and set up on bell (11), receive gas box (61) top and run through to be provided with and insert and establish groove (611), the sense terminal of oxygen probe (3) stretches into to receive gas box (61) through inserting groove (611), pipe (62) set up on bell (11) and the outlet duct communicates with receiving gas box (61), the inlet end of pipe (62) extends to the position of keeping away from intake pipe (2) in furnace body (1), one side that pipe (62) were kept away from in receiving gas box (61) runs through and is provided with gas outlet (612), send out gas fan (63) set up in pipe (62), be provided with driving piece (64) that are used for driving send out gas fan (63) pivoted in pipe (62).

6. The equipment for 18CrNiMo7-6 wind power gear carburizing process according to claim 5, characterized in that: the driving piece (64) comprises a driving shaft (641), a linkage shaft (642), a driving bevel gear (643) and a reversing bevel gear (644), the driving shaft (641) is fixedly connected with the axis of the fan (5), one end, far away from the fan (5), of the driving shaft (641) extends into the air supply pipe (62), the driving bevel gear (643) is fixedly arranged at one end, extending into the air supply pipe (62), of the driving shaft (641), the linkage shaft (642) is fixedly arranged at the axis of the air supply fan (63), the reversing bevel gear (644) is fixedly connected with the linkage shaft (642), and the reversing bevel gear (644) is meshed with the driving and driving bevel gear (643).

7. The equipment for 18CrNiMo7-6 wind power gear carburizing process according to claim 6, characterized in that: the lower surface of the air supply pipe (62) is rotatably provided with a rotating rod (7), the end of the rotating rod (7) is provided with an auxiliary fan (71), the auxiliary fan (71) is positioned in the uniform through groove (131), and the air supply pipe (62) is provided with a rotating part (72) for driving the auxiliary fan (71) to rotate; the rotating part (72) comprises a linkage rotary table (721), a linkage rotary rod (722), a first bevel gear (723) and a second bevel gear (724), the air feeding pipe (62) comprises a first pipe (621) and a second pipe (622), the first pipe (621) is connected with the air receiving box (61), the linkage rotary table (721) is fixedly connected with a linkage shaft (642), the axial side wall of the linkage rotary table (721) is rotatably connected with one end, far away from the air receiving box (61), of the first pipe (621), one end of the second pipe (622) is rotatably connected with the side wall, far away from the first pipe (621), of the linkage rotary table (721), and one end, far away from the linkage rotary table (721), of the second pipe (622) extends to the position, far away from the air inlet pipe (2), in the furnace body (1); the linkage rotating rod (722) is rotatably arranged on the outer side wall of the air feeding pipe (62), the linkage rotating disc (721) is meshed with the linkage rotating rod (722), the first bevel gear (723) is fixedly arranged on the peripheral wall of the linkage rotating rod (722), the second bevel gear (724) is fixedly arranged on the peripheral wall of the rotating rod (7), and the first bevel gear (723) is meshed with the second bevel gear (724).

8. The equipment for 18CrNiMo7-6 wind power gear carburizing process according to claim 7, characterized in that: the second pipe (622) comprises a fixed pipe (6221), a connecting pipe (6222) and a gas collecting pipe (6223), the fixed pipe (6221) is rotatably connected with the linkage turntable (721), the gas collecting pipe (6223) is arranged on the inner side wall of the furnace body (1) and has a vertical axis, the connecting pipe (6222) slides along the vertical direction and is arranged on the vertical inner side wall of the fixed pipe (6221) far away from the linkage turntable (721), the fixed pipe (6221) and the gas collecting pipe (6223) share the same axis, the outer diameter of the connecting pipe (6222) is smaller than or equal to the inner diameter of the gas collecting pipe (6223), a pipe placing part (8) and a pipe collecting part (9) are arranged in the furnace body (1), the square pipe part is used for inserting the connecting pipe (6222) into the gas collecting pipe (6223), and the pipe collecting part (9) is used for collecting the connecting pipe (6222) into the fixed pipe (6221).

9. The equipment for 18CrNiMo7-6 wind power gear carburizing process according to claim 8, characterized in that: the pipe placing part (8) comprises a bearing block (81), a limiting block (82), a first limiting ring (83), a second limiting ring (84) and a shifting block (85), the bearing block (81) is arranged on the inner pipe wall of a fixed pipe (6221), the first limiting ring (83) is arranged on the inner pipe wall of the fixed pipe (6221) and located above the bearing block (81), the limiting block (82) is arranged at the top end of the peripheral wall of a connecting pipe (6222), the second limiting ring (84) is arranged at the bottom end of the inner peripheral wall of the fixed pipe (6221), the lower surface of the limiting block (82) is abutted against the upper surface of the second limiting ring (84), the second limiting ring (84) is abutted against the peripheral wall of the connecting pipe (6222), the shifting block (85) is arranged on the inner side wall of the furnace body (1), the bottom end of the peripheral wall of the connecting pipe (6222) is provided with a sliding groove (6286), and the peripheral wall of the connecting pipe (22) is provided with a chute (87) communicated with the sliding groove, the top end of the chute (87) is far away from the sliding groove (86) along the circumferential direction of the connecting pipe (6222), an abdicating groove (88) is formed in the peripheral wall of the connecting pipe (6222), one end, far away from the sliding groove (86), of the abdicating groove (88) and the chute (87) is communicated, the poking block (85) is inserted into the groove wall of the abdicating groove (88), and the connecting pipe (6222) is inserted into the fixing pipe (6221).

10. The equipment for 18CrNiMo7-6 wind power gear carburizing process according to claim 9, characterized in that: receive pipe fitting (9) including flexible head (91) and expanding spring (92), it is provided with flexible groove (851) towards the one end of even pipe (6222) to dial movable block (85), flexible head (91) slide and set up on flexible groove (851) cell wall, expanding spring (92) set up stretch into in flexible groove (851) one end and flexible groove (851) cell wall at flexible head (91) between, be provided with on even pipe (6222) periphery wall and slide out groove (93), slide out groove (93) top and let groove (88) communicate with each other, slide out groove (93) along even pipe (6222) radial degree of depth along keeping away from the direction of letting groove (88) diminish gradually.