CN110846472A - Heat treatment method for controlling hardness and deformation of low-carbon alloy steel gear - Google Patents
Heat treatment method for controlling hardness and deformation of low-carbon alloy steel gear Download PDFInfo
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- CN110846472A CN110846472A CN201911181862.8A CN201911181862A CN110846472A CN 110846472 A CN110846472 A CN 110846472A CN 201911181862 A CN201911181862 A CN 201911181862A CN 110846472 A CN110846472 A CN 110846472A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/673—Quenching devices for die quenching
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/04—Hardening by cooling below 0 degrees Celsius
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
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- 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
- C23C8/06—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 gases
- C23C8/08—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 gases only one element being applied
- C23C8/20—Carburising
- C23C8/22—Carburising of ferrous surfaces
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Abstract
The invention discloses a heat treatment method for controlling the hardness and deformation of a low-carbon alloy steel gear, which comprises the following steps of: pretreating the low-carbon alloy steel gear part; performing carburizing treatment on the pretreated low-carbon alloy steel gear part; firstly, placing the carburized low-carbon alloy steel gear part at 650 +/-10 ℃ for primary tempering treatment, and then placing the carburized low-carbon alloy steel gear part at 630 +/-10 ℃ for secondary tempering treatment; removing a carburized layer of the tempered low-carbon alloy steel gear part according to a preset requirement, and quenching at the temperature of 810 +/-10 ℃; and (3) sequentially carrying out cold treatment, tempering treatment and post-treatment on the quenched low-carbon alloy steel gear part. The invention has the advantages of low part hardness before quenching after carburization and small heat deformation of the quenched part.
Description
Technical Field
The invention relates to the field of heat treatment of low-carbon alloy steel, in particular to a heat treatment method for controlling the hardness and deformation of a gear of the low-carbon alloy steel.
Background
The 18Cr2Ni4WA steel is a low-carbon alloy steel, is a martensitic steel, and can obtain high hardness on the surface after carburizing and quenching, and has excellent strength and toughness matching. The material can obtain a quenching effect by air cooling, so that the overall hardness of the part is high in the cooling process after carburization, the hardness is difficult to meet the requirements of a machining process by adopting a conventional annealing process after carburization, the conventional annealing process is to preserve heat for 4-5 hours at 640-660 ℃ after carburization, namely, the carburized surface hardness can reach more than HRC50 by only carrying out a tempering process after carburization, and the processing is difficult when a carburized layer is removed by turning before quenching; the spiral bevel gear can be distorted due to the influence of tissue stress and thermal stress in the carburizing and quenching processes, the maximum grinding allowance of the carburized surface after carburizing and quenching is 0.20 and the maximum grinding allowance of the non-working tooth surface is 0.25 according to the existing design, and in order to ensure that the grinding allowance of the carburized and quenched layer surface is uniform, the heat treatment deformation of the part must be accurately controlled.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a heat treatment method for controlling the hardness and the deformation of a low-carbon alloy steel gear, wherein the hardness of a part before quenching after carburization is low, and the thermal deformation of the part after quenching is small.
In order to solve the technical problems, the invention adopts the following technical scheme:
a heat treatment method for controlling the hardness and deformation of a low-carbon alloy steel gear comprises the following steps:
s1, preprocessing the low-carbon alloy steel gear part;
s2, carburizing the pretreated low-carbon alloy steel gear part;
s3, firstly tempering the carburized low-carbon alloy steel gear part at 650 +/-10 ℃ for the first time, and then tempering at 630 +/-10 ℃ for the second time;
s4, removing a carburized layer of the tempered low-carbon alloy steel gear part according to a preset requirement, and quenching at the temperature of 810 +/-10 ℃;
and S5, sequentially carrying out cold treatment, tempering treatment and post-treatment on the quenched low-carbon alloy steel gear part.
As a further improvement of the above technical solution:
in the step S2, the low carbon alloy steel gear part after pretreatment is placed on a carburizing pad for carburizing, the carburizing pad includes a horizontal support member and a vertical support member, the vertical support member is vertically disposed on the horizontal support member, the horizontal support member is located at the bottom of the low carbon alloy steel gear part, and the vertical support member is located in an inner hole of the low carbon alloy steel gear part.
In step S2, the temperature of the carburizing process is 900 ± 10 ℃.
In the step S3, the time of the first tempering and the time of the second tempering are both 4 to 5 hours.
The low-carbon alloy steel gear part is arranged in a combined mold for quenching treatment, the combined mold comprises a tooth pressure ring, a web pressure ring, an inner hole support ring, a lower support ring and a positioning core mold, the tooth pressure ring and the web pressure ring are respectively positioned above the low-carbon alloy steel gear part, the lower support ring and the positioning core mold are positioned below the low-carbon alloy steel gear part, the lower support ring is arranged outside the positioning core mold and used for supporting a web of the low-carbon alloy steel gear part, the web pressure ring is used for pressing the web of the low-carbon alloy steel gear part, the tooth pressure ring is used for pressing a tooth part of the low-carbon alloy steel gear part, and the inner hole support ring is supported in an inner hole of the low-carbon alloy steel gear part. The combined mold influences the deformation amount of the part.
The quenching treatment time is 130-160 min. The adjustment of the quenching temperature and time causes the hardness of the tissue and the matrix to change.
During quenching treatment, the tooth pressure ring applies pressure of 180 +/-10 Psi to the low-carbon alloy steel gear part, and the web pressure ring applies pressure of 90 +/-10 Psi to the low-carbon alloy steel gear part. At this pressure value, the effect of controlling deformation is best.
The combined die further comprises a bottom die, wherein the two sides of the bottom die are supported at the tooth part of the low-carbon alloy steel gear part and the bottom of the lower supporting ring, the middle part of the bottom die is used for installing and positioning the center die, and through holes for allowing quenching oil to pass through are formed in the two sides and the bottom of the bottom die.
In the step S5, the temperature of the cold treatment is-60 to-80 ℃, and the time is 1.5 to 2 hours.
In the step S5, the tempering temperature is 160 +/-10 ℃ and the tempering time is 2.5-3 h. The cold treatment and tempering temperature and time adjustment affect the retained austenite amount and the carburized surface hardness.
In the step S2, the carburizing atmosphere of the carburizing treatment is nitrogen, methanol and acetone, the strong carburizing period carbon potential of the carburizing treatment is 1.02 ± 0.05%, the diffusion period carbon potential is 0.87 ± 0.05%, and the flow rates of nitrogen and methanol are not changed during the carburizing process, and the carbon potential is adjusted by adjusting the flow rate of acetone.
Compared with the prior art, the invention has the advantages that:
the invention carries out the secondary tempering process after the low-carbon alloy steel is carburized, has reasonable process technology, effectively controls the hardness (the hardness is less than or equal to HRC 38) of the low-carbon alloy steel gear part after carburization before quenching, and solves the problem of high hardness machining difficulty of the gear part after carburization.
The invention adopts a carburizing pad during carburizing and adopts a combined die during quenching to control deformation, the combined die comprises a tooth part pressure ring, a web plate pressure ring, an inner hole support ring, a lower support ring and a positioning core die, wherein the tooth part pressure ring and the web plate pressure ring press the gear parts during quenching, the technical problem of large heat treatment deformation of the gear is solved by adjusting the size, quenching pressure, quenching oil flow direction and oil mass of each part of the combined die, and the qualified gear parts with small heat treatment deformation are obtained.
Drawings
FIG. 1 is a schematic view showing the fitting structure of a carburized pad and a gear part in example 1.
FIG. 2 is a schematic view of the mating structure of the carburized pad and gear part in other embodiments.
FIG. 3 is a schematic view of the mating structure of the carburized pad and gear part in other embodiments.
Figure 4 is a schematic view of the mating arrangement of the combination mold and gear part of the present invention.
Fig. 5 is a schematic view showing a fitting structure of the combined mold and gear part in embodiment 1.
Fig. 6 is a schematic structural view of the tooth root pair surface member in embodiment 1.
FIG. 7 is a process flow diagram of example 1.
The reference numerals in the figures denote: 1. a gear component; 2. a carburized pad; 21. a vertical support; 22. a transverse support; 3. a toothed pressure ring; 4. a web pressure ring; 5. an inner bore support ring; 6. a lower support ring; 7. positioning a core mold; 8. sealing an oil ring; 9. a quenching machine tool; 10. bottom die; 11. the tooth root is opposite to the surface piece; 111. a tooth part big end root cone; 112. the small end of the tooth part is root-tapered.
Detailed Description
The invention will be described in further detail below with reference to the drawings and specific examples. Unless otherwise specified, the instruments or materials employed in the present invention are commercially available.
Example 1:
the spiral bevel gear of some aviation product requires that the carburization depth of a tooth part is 1.20-1.50 mm, the carburization surface hardness of the tooth part is 58-63 HRC, and the reading of the root cone of the tooth part relative to the size of a root cone simulation piece is + 0.03- + 0.15.
As shown in fig. 7, the heat treatment method for controlling the hardness and deformation of the gear made of low carbon alloy steel of the present embodiment includes the following steps:
(1) before carburizing the low-carbon alloy steel gear part 1, the processing of a carburized face tooth part and a raceway is finished, and the rest faces are provided with a carburized layer turning allowance (which is more than 2 times of the carburization depth) so as to facilitate the overall carburization of the low-carbon alloy steel gear part 1.
(2) The low-carbon alloy steel gear part 1 is placed in a sand blower to clean carburized surfaces of a runway and a tooth part, the size of corundum sand grains is 100 meshes, and the air pressure is 0.1MPa, so that the sand blowing surface is gray after sand blowing.
(3) The low-carbon alloy steel gear part 1 is placed in a controlled atmosphere carburizing furnace, the low-carbon alloy steel gear part 1 is stably charged by adopting a carburizing pad, and the distance between the low-carbon alloy steel gear parts 1 is 25mm, so that the full circulation of atmosphere is ensured.
During carburizing, the low-carbon alloy steel gear part 1 can generate structure transformation and structure stress; in the heating and cooling processes, thermal stress can be generated due to the temperature difference of all parts of the low-carbon alloy steel gear part 1; the self weight of the low-carbon alloy steel gear part 1 is large, distortion can be generated due to the fact that the part only depends on the unevenness of the surface in the heating state, the distortion is generated when the part is carburized, a carburizing pad is used for each part, the part is placed on the smooth carburizing pad, the carburizing pad is horizontally placed on the furnace plate, and the uneven distortion of the part can be effectively reduced.
The special carburizing pad is designed according to the shape of the part and the distribution of the carburized surface, the flowability of the carburizing atmosphere is considered when the carburizing pad is designed, and the bearing surface of the part is stressed uniformly under the condition of self weight.
As shown in fig. 1, the carburizing pad 2 includes a horizontal support 22 and a vertical support 21, the vertical support 21 is vertically disposed on the horizontal support 22, the horizontal support 22 is located at the bottom of the low carbon alloy steel gear part 1, and the vertical support 21 is located in the inner hole of the low carbon alloy steel gear part 1. In this embodiment, the transverse support 22 is used for supporting a web of the low-carbon alloy steel gear part 1, the tooth portion of the low-carbon alloy steel gear part 1 is arranged downwards, and the bottom of the tooth portion is arranged at an interval with the upper surface of the carburizing furnace, in other embodiments, the transverse support 22 is used for supporting the transmission shaft of the low-carbon alloy steel gear part 1, the tooth portion of the low-carbon alloy steel gear part 1 is arranged upwards, as shown in fig. 2, or in other embodiments, the transverse support 22 is used for simultaneously supporting the transmission shaft of the low-carbon alloy steel gear part 1 and the tooth portion of the low-carbon alloy steel gear part 1, and the tooth portion of the low-carbon alloy steel gear part 1 is arranged upwards, so that the low-carbon alloy steel gear part can be placed.
(4) Carburizing the low-carbon alloy steel gear part 1: the carburizing temperature is 900 ℃, the carburizing process is controlled by a program to firstly carry out forced carburizing and then carry out diffusion, the carburizing atmosphere is nitrogen, methanol and acetone, the temperature of a carburizing chamber is set to be 900 ℃ when the low-carbon alloy steel gear part 1 enters a carburizing heating chamber, the carbon potential is set to be 1.02 percent, and the flow rate of the atmosphere in the carburizing chamber is 2.2m of nitrogen3The flow rate of the methanol is 2.2L/h, the flow rate of the acetone is about 1.1L/h, wherein the flow rates of the nitrogen and the methanol are constant and are always kept unchanged in the whole carburizing process, and the carbon potential is adjusted by adjusting the flow rate of the acetone in the whole carburizing process; the carbon potential in the strong cementation stage is (1.02 +/-0.05)%, and the time is 8 h; the carbon potential (0.87 +/-0.05)%, the time is 6h and 40 min. Correcting the carbon potential for 1 time every 1.5 hours, correcting the carbon potential for 9 times totally, carburizing for 14 hours and 40 minutes, cooling to 80 ℃ in 110 minutes under the nitrogen protection atmosphere after carburizing, and discharging.
(5) Carrying out high-temperature tempering on the low-carbon alloy steel gear part 1: the tempering temperature is 650 ℃, and the tempering time is 4.5 h.
(6) Carrying out high-temperature tempering on the low-carbon alloy steel gear part 1: the tempering temperature is 630 ℃, and the tempering time is 4.5 h.
(7) The carbon layer (hardness of about HRC32 in practice) was removed from the non-carburized side of the design by machining.
(8) Carrying out integral copper plating on the low-carbon alloy steel part, and then quenching: the low-carbon alloy steel gear part 1 is stably placed in a protection box of a box furnace, the quenching temperature is 810 ℃, the temperature is kept for 140min, and oil cooling pressure quenching treatment is carried out by adopting a combined die.
As shown in fig. 4, the combined mold of the present invention includes a tooth pressure ring 3, a web pressure ring 4, an inner hole support ring 5, a lower support ring 6 and a positioning core mold 7, the tooth pressure ring 3 and the web pressure ring 4 are respectively located above the low carbon alloy steel gear part 1, the lower support ring 6 and the positioning core mold 7 are located below the low carbon alloy steel gear part 1, the lower support ring 6 is disposed outside the positioning core mold 7 and is configured to support a web of the low carbon alloy steel gear part 1, the web pressure ring 4 is configured to apply pressure to the web of the low carbon alloy steel gear part 1, the tooth pressure ring 3 is configured to apply pressure to a tooth of the low carbon alloy steel gear part 1, and the inner hole support ring 5 is supported in an inner hole of the low carbon alloy steel gear part 1.
When the tooth part of the gear part 1 is quenched, the tooth part pressure ring 3 presses the upper surface of the tooth part of the gear part 1, quenching oil is directly communicated with a gap between the tooth parts of the gear part 1, and an oil sealing ring 8 is arranged below the tooth part of the gear part 1.
The tooth pressure ring 3 and the amplitude plate pressure ring 4 are connected with a quenching machine tool 9 through threads; the positioning core die 7 and the lower support ring 6 are connected with a plug of a quenching machine tool 9, the inner hole support ring 5 is placed on the positioning core die 7 after the gear part 1 to be quenched is installed, the inner hole support ring 5 and the low-carbon alloy steel part are in clearance fit before quenching, and are in interference fit after quenching. The heat treatment deformation of the parts can be effectively controlled by adjusting the pressure of the tooth part pressure ring 3 and the web plate pressure ring 4, the size of the inner hole support ring 5, the size of the lower support ring 6 and the angle of the tooth part pressure ring 3. In the embodiment, the outer diameter of the inner hole support ring 5 is consistent with the size value of the inner hole of the gear part 1 before heat treatment, and the height is consistent with the height value of the amplitude plate of the gear part 1; the height of the lower support ring 6 is basically consistent with that of the oil seal ring 8; the angle of the tooth pressure ring 3 is basically consistent with the face taper angle of the gear part 1; in other embodiments, the difference value between the angle of the tooth pressure ring 3 and the face cone angle of the gear part 1 is within 10'; the difference value between the outer diameter size of the inner hole support ring 5 and the inner hole size of the gear part 1 is within 0.1 mm; the height of the lower support ring 6 and the pressure of each pressure ring are adjusted according to the actual deformation condition of the gear part 1.
In the combined mold of the embodiment, as shown in fig. 5, the web pressure ring 4 applies a pressure of 90Psi to the web of the gear part 1, the tooth pressure ring 3 applies a pressure of 180Psi to the teeth, the two ends of the bottom mold 10 are supported by the teeth of the gear part 1 and the lower support ring 6, and the positioning core mold 7 is placed in the middle of the bottom mold 10.
The installation operation sequence of the combined mold of the embodiment is as follows: the positioning core mold 7 is arranged on the bottom mold 10 → the bottom mold 10 is arranged on a quenching machine tool → the lower support ring 6 is arranged → the tooth part pressure ring 3 is connected with the machine tool → the web plate pressure ring 4 is connected with the machine tool → the quenching parameter is set (the flow rate of quenching oil is 20 seconds to the full flow rate 1140L/min, 60 seconds to the 50% flow rate 570L/min, 130 seconds to the 50% flow rate 570L/min) → the gear parts are arranged in the bottom mold 10 → the inner hole support ring 5 is arranged again. The purpose of realizing the rapid adjustment of the combination dimension by changing a certain part of the combined die is realized, the quenching deformation of the part is accurately controlled by changing the quenching pressure, the flow direction of the cooling oil and the oil amount, the flow direction of the cooling oil flows from bottom to top, the quenching oil quenches the whole part, and the whole part is immersed in the quenching oil.
(9) Carrying out cold treatment on the gear part 1 of the low-carbon alloy steel for 1 hour after quenching, wherein the temperature is-70 ℃ and the time is 90 min;
(10) and (3) tempering the gear part 1 made of the low-carbon alloy steel after the cold treatment is returned to the room temperature, wherein the temperature is 160 ℃, the time is 165min, and then air cooling to the room temperature.
(11) And removing copper after sand blowing.
(12) And (4) checking: in order to objectively check the deformation condition of the carburized tooth part after carburizing and quenching, the tooth root is adopted to simulate the dimension of the surface part 11 before tooth root cone heat treatment, and the dimension difference between the tooth root cone of the gear part and the surface part 11 is compared to obtain the heat treatment deformation of the tooth root cone of the gear part, so that the tooth part deformation of the gear part can be quickly detected. The tooth root pair gauge 11 of the invention is shown in fig. 6, 111 and 112 in the figure correspond to a large end root cone and a small end root cone of a spiral bevel gear tooth part, the position shown by an arrow also corresponds to the position of a dial indicator head, and the angles of the points 111 and 112 of the gauge are consistent with the angle of the tooth root cone of the gear part 1 and the size is consistent. The dial indicator 11 is used for indicating the surface, then the dial indicator is taken out, the gear part 1 is installed for detecting the tooth root, then the dial indicator (the dial indicator head is perpendicular to the conical surface of the dial indicator 11 during detection, the dial indicator is shifted to enable the pointer to be zero, then the dial indicator is fixed, the dial indicator is taken down, the dial indicator is installed for detecting the tooth root, the reading returns to the zero point, the deviation value is the tooth root deformation value) reflects the reading difference, and the difference value is the tooth root deformation value.
The final test result of this example is: the depth of a carburized layer of a tooth part of the low-carbon alloy steel gear is 1.37mm, the hardness of a carburized surface of the tooth part is 62HRC, and the reading of a large-end root cone point and a small-end root cone point of the tooth part are in the range of +0.03 to +0.15, which indicates that the gear part obtained by the method is qualified.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (10)
1. A heat treatment method for controlling the hardness and deformation of a low-carbon alloy steel gear is characterized by comprising the following steps of: the method comprises the following steps:
s1, preprocessing the low-carbon alloy steel gear part (1);
s2, carburizing the pretreated low-carbon alloy steel gear part (1);
s3, firstly tempering the carburized low-carbon alloy steel gear part (1) at 650 +/-10 ℃ for the first time, and then tempering at 630 +/-10 ℃ for the second time;
s4, removing a carburized layer of the tempered low-carbon alloy steel gear part (1) according to a preset requirement, and quenching at the temperature of 810 +/-10 ℃;
and S5, sequentially carrying out cold treatment, tempering treatment and post-treatment on the quenched low-carbon alloy steel gear part (1).
2. The heat treatment method according to claim 1, characterized in that: in the step S2, the pretreated low-carbon alloy steel gear part (1) is placed on a carburizing pad (2) for carburizing treatment, the carburizing pad (2) comprises a transverse support piece (22) and a vertical support piece (21), the vertical support piece (21) is vertically arranged on the transverse support piece (22), the transverse support piece (22) is located at the bottom of the low-carbon alloy steel gear part (1), and the vertical support piece (21) is located in an inner hole of the low-carbon alloy steel gear part (1).
3. The heat treatment method according to claim 2, characterized in that: in step S2, the temperature of the carburizing process is 900 ± 10 ℃.
4. The heat treatment method according to claim 1, characterized in that: in the step S3, the time of the first tempering and the time of the second tempering are both 4 to 5 hours.
5. The heat treatment method according to claim 1, characterized in that: the low-carbon alloy steel gear part (1) is placed in a combined mold for quenching treatment, the combined mold comprises a tooth pressure ring (3), a web pressure ring (4), an inner hole support ring (5), a lower support ring (6) and a positioning core mold (7), the tooth pressure ring (3) and the web pressure ring (4) are respectively located above the low-carbon alloy steel gear part (1), the lower support ring (6) and the positioning core mold (7) are located below the low-carbon alloy steel gear part (1), the lower support ring (6) is arranged outside the positioning core mold (7) and is used for supporting a web of the low-carbon alloy steel gear part (1), the web pressure ring (4) is used for pressing the web of the low-carbon alloy steel gear part (1), the tooth pressure ring (3) is used for pressing the alloy steel tooth part of the low-carbon alloy steel gear part (1), the inner hole support ring (5) is supported in the inner hole of the low-carbon alloy steel gear part (1).
6. The heat treatment method according to claim 5, characterized in that: the quenching treatment time is 130-160 min.
7. The heat treatment method according to claim 5, characterized in that: during the quenching treatment, the tooth pressure ring (3) applies a pressure of 180 +/-10 Psi to the low-carbon alloy steel gear part (1), and the web pressure ring (4) applies a pressure of 90 +/-10 Psi to the low-carbon alloy steel gear part (1).
8. The heat treatment method according to claim 7, characterized in that: the combined die further comprises a bottom die (10), wherein the two sides of the bottom die (10) are supported at the tooth part of the low-carbon alloy steel gear part (1) and the bottom of the lower supporting ring (6), the middle part of the bottom die (10) is used for installing and positioning a center die (7), and through holes for allowing quenching oil to pass through are formed in the two sides and the bottom of the bottom die (11).
9. The heat treatment method according to any one of claims 1 to 8, characterized in that: in the step S5, the temperature of the cold treatment is-60 to-80 ℃, and the time is 1.5 to 2 hours.
10. The heat treatment method according to any one of claims 1 to 8, characterized in that: in the step S5, the tempering temperature is 160 +/-10 ℃ and the tempering time is 2.5-3 h.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112522499A (en) * | 2020-11-11 | 2021-03-19 | 中国航发中传机械有限公司 | Heat treatment method of oblique-amplitude plate cylindrical gear for aviation |
| CN114369704A (en) * | 2021-12-20 | 2022-04-19 | 无锡鹰贝精密液压有限公司 | Low-carbon alloy steel ball socket plunger heat treatment method for reducing deformation of inner spherical surface |
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| CN112522499A (en) * | 2020-11-11 | 2021-03-19 | 中国航发中传机械有限公司 | Heat treatment method of oblique-amplitude plate cylindrical gear for aviation |
| CN114369704A (en) * | 2021-12-20 | 2022-04-19 | 无锡鹰贝精密液压有限公司 | Low-carbon alloy steel ball socket plunger heat treatment method for reducing deformation of inner spherical surface |
| CN114369704B (en) * | 2021-12-20 | 2023-12-26 | 无锡鹰贝精密液压有限公司 | Low-carbon alloy steel ball socket plunger heat treatment method for reducing inner spherical surface deformation |
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