CN111809136A - Heat treatment carburizing process of high-temperature carburizing steel H10Cr4Mo4Ni4V - Google Patents
Heat treatment carburizing process of high-temperature carburizing steel H10Cr4Mo4Ni4V Download PDFInfo
- Publication number
- CN111809136A CN111809136A CN202010605762.XA CN202010605762A CN111809136A CN 111809136 A CN111809136 A CN 111809136A CN 202010605762 A CN202010605762 A CN 202010605762A CN 111809136 A CN111809136 A CN 111809136A
- Authority
- CN
- China
- Prior art keywords
- workpiece
- carburizing
- furnace body
- iron sand
- furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005255 carburizing Methods 0.000 title claims abstract description 117
- 238000010438 heat treatment Methods 0.000 title claims abstract description 64
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 46
- 239000010959 steel Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000008569 process Effects 0.000 title claims abstract description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 196
- 229910052742 iron Inorganic materials 0.000 claims abstract description 100
- 239000004576 sand Substances 0.000 claims abstract description 93
- 238000005192 partition Methods 0.000 claims description 14
- 239000007921 spray Substances 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 238000009933 burial Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 235000019362 perlite Nutrition 0.000 claims description 3
- 239000010451 perlite Substances 0.000 claims description 3
- 238000005496 tempering Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 abstract description 5
- 229910052751 metal Inorganic materials 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 30
- 230000000694 effects Effects 0.000 description 17
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 6
- 239000002344 surface layer Substances 0.000 description 6
- 239000010410 layer Substances 0.000 description 4
- 238000005422 blasting Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 241000883990 Flabellum Species 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
Images
Classifications
-
- 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
- C23C8/06—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
-
- 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
- C23C8/80—After-treatment
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention belongs to the technical field of metal heat treatment, in particular to a heat treatment carburizing process of high-temperature carburizing steel H10Cr4Mo4Ni4V, wherein a carburizing furnace used in the process comprises a base; the base is fixedly connected with a support, and the upper part of the support is fixedly connected with a rotating shaft; the rotating shaft is sleeved with a cylindrical furnace body, and the furnace body is rotatably connected with the rotating shaft; a furnace door is arranged on one side of the furnace body away from the bracket; the periphery of the furnace body is provided with a heating device, the periphery of the furnace body is fixedly connected with an outer gear ring, a base is fixedly connected with a motor at a position corresponding to the outer gear ring, the motor is connected with a power supply through a controller, and a gear fixedly connected with an output shaft of the motor is internally combined with the outer gear ring; one end of the rotating shaft extending into the furnace body is provided with a bearing frame for placing a workpiece; iron sand is filled in the furnace body; a vent hole is arranged in the rotating shaft, one end of the vent hole is communicated with the interior of the furnace body, and the other end of the vent hole is communicated with carburizing gas through a pipeline and a valve; according to the invention, the heating efficiency of the workpiece is increased by the rotation of the iron sand along with the furnace body, so that the carburizing efficiency of the workpiece is increased.
Description
Technical Field
The invention belongs to the technical field of metal heat treatment, and particularly relates to a heat treatment carburizing process of high-temperature carburized steel H10Cr4Mo4Ni 4V.
Background
With the rapid development of the aviation industry, higher requirements are put forward on the performance of a main shaft bearing of a jet engine, and the main shaft bearing of the jet engine is required to have high-temperature hardness besides high working speed, high fracture toughness and high contact fatigue life (more than 900 hours), so that the jet engine is ensured not to fail suddenly due to brittle fracture and the like of the bearing in the working process.
The low toughness of fully quenched steel is well known, so the research on manufacturing the main shaft bearing of the engine by adopting high-fracture-toughness high-temperature carburized bearing steel is a problem to be solved urgently at present, and research data shows that the bearing has high fracture toughness and high contact fatigue life, and also has better high-temperature hardness, and the hardness is not lower than HRC58 when the bearing is aged at 315 ℃ for 1000 hours; in order to meet the use requirements, high-temperature carburizing steel (H10Cr4Mo4Ni4V) is selected, the steel is smelted by adopting a double-vacuum technology, the purity of the material is high, nonmetallic inclusions can not be seen almost when the oxygen content (mass fraction) is less than 10 multiplied by 10 < -6 >, the annealing structure is very uniform, the crystal grains are fine, and the carbide is uniformly distributed. Because the steel contains more alloy elements, the heat treatment process is greatly different from that of the common carburized steel.
The carburizing process is the most important link of the whole heat treatment process, directly influences the heat treatment quality of the working surface of the bearing, some technical schemes related to the carburizing process of high-temperature carburizing steel appear in the prior art, for example, a Chinese patent with the application number of 2004100102675 discloses a heat treatment carburizing process of high-temperature carburizing steel (H10Cr4Mo4Ni4V), and the process parameters are as follows: carrying out carburizing treatment on the workpiece through a carburizing furnace, wherein the carburizing temperature is as follows: the strong cementation period 910-
In the formula: h represents the carburization depth, a coefficient, and t represents time. The surface of the high-temperature carburized steel (H10Cr4Mo4Ni4V) treated according to the process parameters does not contain coarse carbides and reticular carbides, has reasonable carbon concentration and strength, and has better carburized layer structure, surface carbon concentration and carbon concentration gradient; however, in the existing carburizing furnace, due to the heat convection effect of air in the furnace body, hot air is gathered at the top in the furnace body, a workpiece cannot be rapidly heated, the carburizing depth of the workpiece is not uniform, and the carburizing quality of the workpiece is reduced.
Disclosure of Invention
In order to make up for the defects of the prior art and solve the problems that the hot air is gathered at the top in the furnace body, the workpiece cannot be rapidly heated, the carburization depth of the workpiece is not uniform and the carburization quality of the workpiece is reduced due to the heat convection effect of the air in the furnace body of the existing carburizing furnace, the invention provides the heat treatment carburization process of the high-temperature carburized steel H10Cr4Mo4Ni 4V.
The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a heat treatment carburizing process of high-temperature carburizing steel H10Cr4Mo4Ni4V, which comprises the following steps:
s1, pre-carburizing: putting a workpiece to be carburized into a carburizing furnace, then heating the carburizing furnace to 850-880 ℃, carrying out pre-carburizing for 1-3h, and ensuring that the furnace pressure in the carburizing furnace is 1.1-1.2 standard atmospheric pressures; then discharging and air cooling to room temperature;
s2, performing circulating carburization, namely putting the workpiece subjected to the pre-carburization in the S1 into a carburizing furnace again, heating to 900-950 ℃, preserving heat for 2-3 hours, taking out the workpiece, performing oil cooling forced cooling, circulating for 2-3 times, performing strong carburization on the workpiece, ensuring the carburization temperature to be 920-930 ℃ and the carbon potential to be 0.5-0.7, taking out the workpiece, and slowly cooling the workpiece into perlite to room temperature;
s3, tempering the workpiece after the medium-strength carburization in the S2 at 150-180 ℃, and keeping the temperature for 2-3 h;
wherein the carburizing furnace described in S1 includes a base; the base is fixedly connected with a support, and the upper part of the support is fixedly connected with a rotating shaft; the rotating shaft is sleeved with a cylindrical furnace body, and the furnace body is rotatably connected with the rotating shaft; a furnace door is arranged on one side of the furnace body, which is far away from the bracket; the periphery of the furnace body is provided with a heating device, the periphery of the furnace body is fixedly connected with an outer gear ring, a base is fixedly connected with a motor at a position corresponding to the outer gear ring, the motor is connected with a power supply through a controller, and a gear fixedly connected with an output shaft of the motor is internally combined with the outer gear ring; one end of the rotating shaft extending into the furnace body is provided with a bearing frame for placing a workpiece; iron sand is filled in the furnace body; a vent hole is arranged in the rotating shaft, one end of the vent hole is communicated with the interior of the furnace body, and the other end of the vent hole is communicated with carburizing gas through a pipeline and a valve; the heating efficiency of the workpiece is increased by the rotation of the iron sand along with the furnace body, so that the carburizing efficiency of the workpiece is increased; when the device is used, the furnace door is opened, a workpiece is placed on the bearing frame and firmly fixed, then the furnace door is closed, the furnace body is heated by the heating device, the workpiece reaches a preset carburizing temperature, then carburizing gas is blown in through the vent holes, the surface of the workpiece is carburized, due to the heat convection effect of the air in the furnace body, hot air is gathered at the top in the furnace body, the workpiece cannot be rapidly heated, the carburizing gas blown out from the vent holes can not well and uniformly wrap the surface of the workpiece, further the carburizing depth of the workpiece is nonuniform, the carburizing quality of the workpiece is reduced, at the moment, the outer gear ring and the furnace body are driven to continuously rotate through the electric gear of the motor, the temperature of the furnace body is fully transmitted to the surface of the workpiece through iron sand, the surface of the workpiece is uniformly heated, and the circulation efficiency of the air in the furnace body is increased by matching with the rotation of the iron sand and, avoid hot-air to collect at the furnace body top, increased the heating efficiency of work piece, the air of circulation flow drives the even work piece surface that flows of carburizing gas simultaneously, further increases the carburization efficiency of work piece.
Preferably, the bearing frame is fixedly connected with the rotating shaft through an L-shaped connecting rod, and the connecting rod is used for reducing the height of the bearing frame and increasing the burial depth of iron sand on the workpiece; reduce the height that holds the frame through the connecting rod, and then reduce the relative height of work piece in the furnace body, and then make more cover work pieces of iron sand, increase the area of contact of iron sand and work piece, further increase the heating efficiency of iron sand to the work piece, constantly absorb the heat that furnace body periphery heating device sent along with furnace body pivoted iron sand simultaneously, increase thermal utilization efficiency, after the iron sand absorbs the heat, store partial heat, and then when making the work piece accomplish carburization and opening the furnace gate, reduce the heat in the furnace body and reduce along with the excessive and quick reduction of high temperature air, increase the thermal insulation performance of furnace body, increase the heating efficiency after next batch work piece sends into the furnace body.
Preferably, a group of splayed partition plates are uniformly distributed on the circumference of the inner periphery of the furnace body, the flowing speed of iron sand is increased through the partition plates, and the heating efficiency of the workpiece is further increased; through the baffle that the splayed arranged, increase the furnace body and carry the height of iron sand, make the iron sand just fall under the effect of dead weight after being carried higher height, and then increase the contact time of iron sand and furnace body inner wall, it absorbs heating device and sends calorific efficiency to increase the iron sand, make full use of heat energy heating work piece, promote the higher iron sand of height simultaneously and increase the cover efficiency to the work piece top, further increase the homogeneity of workpiece surface heating, increase the carburization quality, the baffle can also act as the flabellum simultaneously, further increase the circulation efficiency of air in the furnace body, increase the contact efficiency of carburizing gas and work piece, further increase the carburization efficiency of work piece.
Preferably, the funnel is connected above the bearing frame through a support rod, and a first hole communicated with the vent hole is formed in the support rod; a support rod at the bottom of the funnel is provided with a spray hole with a downward opening, the spray hole is communicated with the first hole, and high-speed airflow is blown out through the first hole to drive iron sand to strike a workpiece, so that the surface of the workpiece is cleaned; rotate through baffle cooperation furnace body, promote some iron sand to the furnace body and flow into the funnel after being close to upper portion, later cooperate a hole spun high velocity air current, make the air current carry iron sand from the high-speed blowout in the orifice, and then increase the speed that iron sand strikes the work piece, make iron sand form the sandblast effect, increase workpiece surface's rust cleaning effect, and then make workpiece surface's metal abundant with the gaseous contact of carburizing, reduce the influence of oxide layer such as iron rust to the work piece carburization degree of depth, further increase the carburization thickness homogeneity of work piece.
Preferably, the iron sand is doped with steel balls, and the diameter of each steel ball is smaller than that of each funnel and each spray hole; one side of the partition board close to the inner wall of the furnace body is provided with a group of sieve pores, the diameters of the sieve pores are larger than the diameter of the iron sand and smaller than the diameter of the steel ball, the steel ball is used for striking the workpiece, the internal stress of the workpiece is eliminated, and the fatigue resistance of the workpiece is improved; the steel ball rises along with the partition plate and is conveyed into the hopper, after being accelerated by high-speed airflow sprayed from the first hole, the steel ball is sprayed to the workpiece, so that the surface of the workpiece is beaten, residual compressive stress is introduced into the non-uniform plastic deformation outer surface layer of the surface of the workpiece through shot blasting effect, residual tensile stress is generated on the inner surface layer, the fatigue fracture resistance of the workpiece can be improved, fatigue failure is prevented, plastic deformation and brittle fracture are prevented, and the fatigue life is prolonged; and a part of iron sand is screened out through the sieve holes, so that the nozzle holes are prevented from being blocked by excessive iron sand and steel balls, the injection efficiency of the nozzle holes is increased, and the carburizing quality of the workpiece is further increased.
Preferably, a second hole communicated with the vent hole is formed in the connecting rod, a group of third holes communicated with the lower surface of the connecting rod are formed in the second hole, air flow is ejected from the third holes to further increase the flowability of iron sand, and the carburizing efficiency of the workpiece is increased; through the No. three hole that the opening is down, cooperation orifice spun carburizing gas for the carburizing gas forms the convection current in the furnace body, increases the circulating speed of carburizing gas on furnace body surface, further increases the carburization efficiency of work piece, and the gas of spout makes the iron sand form the quicksand form downwards simultaneously, further increases the circulation efficiency that floats of iron sand, increases the contact heating efficiency of iron sand to the work piece, and then further increases the carburization quality of work piece.
The invention has the following beneficial effects:
1. according to the heat treatment carburizing process of the high-temperature carburizing steel H10Cr4Mo4Ni4V, the furnace body continuously rotates and is matched with the rotation of the iron sand, so that the temperature of the furnace body is fully transmitted to the surface of a workpiece through the iron sand, the surface of the workpiece is uniformly heated, the circulation efficiency of air in the furnace body is increased by matching with the rotation of the iron sand and the furnace body, the carburizing gas is driven to uniformly flow through the surface of the workpiece, and the carburizing efficiency of the workpiece is further increased.
2. According to the heat treatment carburizing process of the high-temperature carburized steel H10Cr4Mo4Ni4V, the third hole with the downward opening is matched with the carburizing gas sprayed from the spraying holes, so that convection of the carburizing gas is formed in the furnace body, the circulation speed of the carburizing gas on the surface of the furnace body is increased, the carburizing efficiency of workpieces is further increased, and meanwhile, the downward sprayed gas enables iron sand to form a quicksand shape, the floating circulation efficiency of the iron sand is further increased, the contact heating efficiency of the iron sand on the workpieces is increased, and the carburizing quality of the workpieces is further increased.
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 carburizing furnace according to the present invention;
FIG. 3 is a sectional view of a carburizing furnace according to the present invention;
in the figure: the furnace comprises a base 1, a support 11, a rotating shaft 1, a furnace body 13, a furnace door 14, an outer gear ring 15, a motor 17, a gear 18, a bearing frame 19, a vent hole 2, a connecting rod 21, a partition plate 22, a support rod 23, a funnel 24, a first hole 25, a spray hole 26, a steel ball 27, a sieve hole 28, a second hole 3 and a third hole 31.
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 fig. 3, the heat treatment carburizing process of the high-temperature carburized steel H10Cr4Mo4Ni4V of the invention comprises the following steps:
s1, pre-carburizing: putting a workpiece to be carburized into a carburizing furnace, then heating the carburizing furnace to 850-880 ℃, carrying out pre-carburizing for 1-3h, and ensuring that the furnace pressure in the carburizing furnace is 1.1-1.2 standard atmospheric pressures; then discharging and air cooling to room temperature;
s2, performing circulating carburization, namely putting the workpiece subjected to the pre-carburization in the S1 into a carburizing furnace again, heating to 900-950 ℃, preserving heat for 2-3 hours, taking out the workpiece, performing oil cooling forced cooling, circulating for 2-3 times, performing strong carburization on the workpiece, ensuring the carburization temperature to be 920-930 ℃ and the carbon potential to be 0.5-0.7, taking out the workpiece, and slowly cooling the workpiece into perlite to room temperature;
s3, tempering the workpiece after the medium-strength carburization in the S2 at 150-180 ℃, and keeping the temperature for 2-3 h;
wherein the carburizing furnace described in S1 includes a base 1; the base 1 is fixedly connected with a support 11, and the upper part of the support 11 is fixedly connected with a rotating shaft 12; a cylindrical furnace body 13 is sleeved on the rotating shaft 12, and the furnace body 13 is rotatably connected with the rotating shaft 12; a furnace door 14 is arranged on one side of the furnace body 13 far away from the bracket 11; the periphery of the furnace body 13 is provided with a heating device, the periphery of the furnace body 13 is fixedly connected with an outer gear ring 15, the corresponding position of the base 1 and the outer gear ring 15 is fixedly connected with a motor 17, the motor 17 is connected with a power supply through a controller, and a gear 18 fixedly connected with an output shaft of the motor 17 is meshed with the outer gear ring 15; one end of the rotating shaft 12 extending into the furnace body 13 is provided with a bearing frame 19 for placing a workpiece; iron sand is filled in the furnace body 13; a vent hole 2 is arranged in the rotating shaft 12, one end of the vent hole 2 is communicated with the interior of the furnace body 13, and the other end is communicated with carburizing gas through a pipeline and a valve; the heating efficiency of the workpiece is increased by the rotation of the iron sand along with the furnace body 13, so that the carburizing efficiency of the workpiece is increased; when the furnace is used, the furnace door 14 is opened, a workpiece is placed on the bearing frame 19 and firmly fixed, the furnace door 14 is closed, the furnace body 13 is heated through the heating device, the workpiece reaches a preset carburizing temperature, carburizing gas is blown in through the vent holes 2, the surface of the workpiece is carburized, hot air is gathered at the top in the furnace body 13 due to the heat convection effect of air in the furnace body 13, the workpiece cannot be rapidly heated, the carburizing gas blown out from the vent holes 2 cannot well and uniformly wrap the surface of the workpiece, the carburizing depth of the workpiece is further uneven, the carburizing quality of the workpiece is reduced, at the moment, the electric gear 18 of the motor 17 further drives the outer gear ring 15 and the furnace body 13 to continuously rotate, the rotation of iron sand is matched, the temperature of the furnace body 13 is fully transmitted to the surface of the workpiece through the iron sand, and the surface of the workpiece is uniformly heated, the rotation of cooperation iron sand and furnace body 13 increases the circulation efficiency that furnace body 13 drove the air, avoids hot-air to collect at furnace body 13 top, has increased the efficiency of being heated of work piece, and the air of circulation flow drives the carburizing gas and evenly flows through the work piece surface simultaneously, further increases the carburizing efficiency of work piece.
As an embodiment of the invention, the bearing frame 19 is fixedly connected with the rotating shaft 12 through an L-shaped connecting rod 21, and the connecting rod 21 is used for reducing the height of the bearing frame 19 and increasing the burial depth of iron sand on a workpiece; the height of the bearing frame 19 is reduced through the connecting rod 21, the relative height of the workpiece in the furnace body 13 is further reduced, more workpieces are covered by iron sand, the contact area between the iron sand and the workpiece is increased, the heating efficiency of the iron sand to the workpiece is further increased, meanwhile, the heat emitted by the heating device at the periphery of the furnace body 13 is continuously absorbed by the iron sand rotating along with the furnace body 13, the utilization efficiency of the heat is increased, after the iron sand absorbs the heat, partial heat is stored, and further when the workpiece is carburized and the furnace door 14 is opened, the heat in the furnace body 13 is reduced rapidly along with the overflow of high-temperature air, the heat insulation performance of the furnace body 13 is increased, and the heating efficiency of the next batch of workpieces after being sent into the furnace body.
As an embodiment of the invention, a group of partition plates 22 arranged in a splayed shape are uniformly distributed on the inner circumference of the furnace body 13, and the flowing speed of iron sand is increased through the partition plates 22, so that the heating efficiency of the workpiece is further increased; baffle 22 through the splayed arrangement, increase the height that furnace body 13 carried the iron sand, make the iron sand just fall under the effect of dead weight after being carried higher height, and then increase the contact time of iron sand and furnace body 13 inner wall, it absorbs heating device and sends calorific efficiency to increase the iron sand, make full use of heat energy heating work piece, promote the higher iron sand of height simultaneously and increase the cover efficiency to the work piece top, further increase the homogeneity of workpiece surface heating, increase the carburization quality, baffle 22 can also act as the flabellum simultaneously, further increase the circulation efficiency of air in the furnace body 13, increase the contact efficiency of carburizing gas and work piece, further increase the carburization efficiency of work piece.
As an embodiment of the invention, a funnel 24 is connected above the bearing frame 19 through a support rod 23, and a first hole 25 communicated with the vent hole 2 is formed in the support rod 23; a support rod 23 at the bottom of the funnel 24 is provided with a spray hole 26 with a downward opening, the spray hole 26 is communicated with the first hole 25, and high-speed airflow is blown out through the first hole 25 to drive iron sand to strike a workpiece, so that the surface of the workpiece is cleaned; cooperate the furnace body 13 through baffle 22 and rotate, promote part of iron sand to the furnace body 13 and flow into the funnel 24 after being close to upper portion, later cooperate the high-speed air current of No. 25 spun in the one number hole, make the air current carry iron sand from orifice 26 high-speed blowout, and then increase the speed that iron sand strikes the work piece, make iron sand form the sandblast effect, increase the rust cleaning effect on workpiece surface, and then make the metal on workpiece surface abundant with the gaseous contact of carburizing, reduce the influence of oxide layer such as iron rust to the work piece carburization degree of depth, further increase the carburization thickness homogeneity of work piece.
As an embodiment of the present invention, the iron sand is doped with steel balls 27, and the diameter of the steel balls 27 is smaller than the diameter of the funnel 24 and the diameter of the spray holes 26; one side of the partition plate 22 close to the inner wall of the furnace body 13 is provided with a group of sieve holes 28, the diameter of each sieve hole 28 is larger than that of iron sand and smaller than that of the steel ball 27, the steel ball 27 is used for striking the workpiece, the internal stress of the workpiece is eliminated, and the fatigue resistance of the workpiece is improved; the steel ball 27 rises along with the partition plate 22 and is conveyed into the hopper 24, the steel ball 27 is accelerated by high-speed airflow sprayed from the first hole 25 and then sprayed to a workpiece, the surface of the workpiece is beaten, residual compressive stress is introduced into the non-uniform plastic deformation outer surface layer of the surface of the workpiece through shot blasting effect, residual tensile stress is generated on the inner surface layer, the fatigue fracture resistance of the workpiece can be improved, fatigue failure is prevented, plastic deformation and brittle fracture are prevented, and the fatigue life is prolonged; a part of iron sand is screened out through the sieve holes 28, so that excessive iron sand and the steel balls 27 are prevented from blocking the spray holes 26, the spraying efficiency of the spray holes 26 is increased, and the carburizing quality of workpieces is further increased.
As an embodiment of the invention, a second hole 3 communicated with the vent hole 2 is formed in the connecting rod 21, a group of third holes 31 communicated with the lower surface of the connecting rod 21 are formed in the second hole 3, and air flow is ejected from the third holes 31 to further increase the fluidity of iron sand and increase the carburizing efficiency of a workpiece; through No. three hole 31 that the opening is down, the gaseous carburizing gas of cooperation orifice 26 spun for the carburizing gas forms the convection current in furnace body 13 drives, increases the circulating speed of carburizing gas on furnace body 13 surface, further increases the carburization efficiency of work piece, and the gaseous iron sand that makes of downward spun simultaneously forms the quicksand form, further increases the circulation efficiency that floats of iron sand, increases the contact heating efficiency of iron sand to the work piece, and then further increases the carburization quality of work piece.
When the furnace is used, the furnace door 14 is opened, a workpiece is placed on the bearing frame 19 and firmly fixed, the furnace door 14 is closed, the furnace body 13 is heated through the heating device, the workpiece reaches a preset carburizing temperature, carburizing gas is blown in through the vent holes 2, the surface of the workpiece is carburized, hot air is gathered at the top in the furnace body 13 due to the heat convection effect of air in the furnace body 13, the workpiece cannot be rapidly heated, the carburizing gas blown out from the vent holes 2 cannot well and uniformly wrap the surface of the workpiece, the carburizing depth of the workpiece is further uneven, the carburizing quality of the workpiece is reduced, at the moment, the electric gear 18 of the motor 17 further drives the outer gear ring 15 and the furnace body 13 to continuously rotate, the rotation of iron sand is matched, the temperature of the furnace body 13 is fully transmitted to the surface of the workpiece through the iron sand, and the surface of the workpiece is uniformly heated, the circulation efficiency of the furnace body 13 for driving air is increased by matching with the rotation of the iron sand and the furnace body 13, the hot air is prevented from being collected at the top of the furnace body 13, the heating efficiency of the workpiece is increased, meanwhile, the air which circularly flows drives the carburizing gas to uniformly flow through the surface of the workpiece, and the carburizing efficiency of the workpiece is further increased; the height of the bearing frame 19 is reduced through the connecting rod 21, so that the relative height of the workpiece in the furnace body 13 is reduced, more iron sand covers the workpiece, the contact area of the iron sand and the workpiece is increased, the heating efficiency of the iron sand on the workpiece is further increased, meanwhile, the iron sand rotating along with the furnace body 13 continuously absorbs heat emitted by a heating device at the periphery of the furnace body 13, the utilization efficiency of the heat is increased, after the iron sand absorbs the heat, partial heat is stored, so that when the workpiece is carburized and the furnace door 14 is opened, the heat in the furnace body 13 is reduced rapidly along with the overflow of high-temperature air, the heat insulation performance of the furnace body 13 is increased, and the heating efficiency of the next batch of workpieces after being sent into the furnace body 13 is increased; the height of iron sand carried by the furnace body 13 is increased through the baffle plates 22 arranged in a splayed manner, so that the iron sand falls under the action of self weight after being carried to a higher height, the contact time of the iron sand and the inner wall of the furnace body 13 is further increased, the efficiency of the iron sand absorbing and heating device for generating heat is increased, the workpiece is heated by fully utilizing heat energy, meanwhile, the efficiency of covering the top of the workpiece is increased by improving the iron sand with the higher height, the uniformity of heating the surface of the workpiece is further increased, the carburizing quality is increased, meanwhile, the baffle plates 22 can also serve as fan blades, the circulation efficiency of air in the furnace body 13 is further increased, the contact efficiency of carburizing gas and the workpiece is increased, and the carburizing efficiency of the workpiece; the partition plate 22 is matched with the furnace body 13 to rotate, part of iron sand is lifted to the furnace body 13 to flow into the hopper 24 after approaching the upper part, and then is matched with high-speed airflow sprayed from the first hole 25, so that the airflow carries the iron sand to be sprayed out from the spray hole 26 at high speed, the speed of the iron sand impacting a workpiece is increased, the iron sand forms a sand blasting effect, the rust removing effect of the surface of the workpiece is increased, metal on the surface of the workpiece is fully contacted with carburizing gas in a cross mode, the influence of oxide layers such as iron rust on the carburizing depth of the workpiece is reduced, and the carburizing thickness uniformity of the workpiece is further; the steel ball 27 rises along with the partition plate 22 and is conveyed into the hopper 24, the steel ball 27 is accelerated by high-speed airflow sprayed from the first hole 25 and then sprayed to a workpiece, the surface of the workpiece is beaten, residual compressive stress is introduced into the non-uniform plastic deformation outer surface layer of the surface of the workpiece through shot blasting effect, residual tensile stress is generated on the inner surface layer, the fatigue fracture resistance of the workpiece can be improved, fatigue failure is prevented, plastic deformation and brittle fracture are prevented, and the fatigue life is prolonged; a part of iron sand is screened out through the sieve holes 28, so that excessive iron sand and steel balls 27 are prevented from blocking the spray holes 26, the spraying efficiency of the spray holes 26 is increased, and the carburizing quality of workpieces is further increased; through No. three hole 31 that the opening is down, the gaseous carburizing gas of cooperation orifice 26 spun for the carburizing gas forms the convection current in furnace body 13 drives, increases the circulating speed of carburizing gas on furnace body 13 surface, further increases the carburization efficiency of work piece, and the gaseous iron sand that makes of downward spun simultaneously forms the quicksand form, further increases the circulation efficiency that floats of iron sand, increases the contact heating efficiency of iron sand to the work piece, and then further increases the carburization quality of work piece.
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 heat treatment carburizing process of high-temperature carburizing steel H10Cr4Mo4Ni4V is characterized in that: the method comprises the following steps:
s1, pre-carburizing: putting a workpiece to be carburized into a carburizing furnace, then heating the carburizing furnace to 850-880 ℃, carrying out pre-carburizing for 1-3h, and ensuring that the furnace pressure in the carburizing furnace is 1.1-1.2 standard atmospheric pressures; then discharging and air cooling to room temperature;
s2, performing circulating carburization, namely putting the workpiece subjected to the pre-carburization in the S1 into a carburizing furnace again, heating to 900-950 ℃, preserving heat for 2-3 hours, taking out the workpiece, performing oil cooling forced cooling, circulating for 2-3 times, performing strong carburization on the workpiece, ensuring the carburization temperature to be 920-930 ℃ and the carbon potential to be 0.5-0.7, taking out the workpiece, and slowly cooling the workpiece into perlite to room temperature;
s3, tempering the workpiece after the medium-strength carburization in the S2 at 150-180 ℃, and keeping the temperature for 2-3 h;
wherein the carburizing furnace described in S1 includes a base (1); the base (1) is fixedly connected with a support (11), and the upper part of the support (11) is fixedly connected with a rotating shaft (12); the rotating shaft (12) is sleeved with a cylindrical furnace body (13), and the furnace body (13) is rotatably connected with the rotating shaft (12); a furnace door (14) is arranged on one side of the furnace body (13) far away from the bracket (11); the heating device is arranged on the periphery of the furnace body (13), the outer gear ring (15) is fixedly connected on the periphery of the furnace body (13), the motor (17) is fixedly connected at the position, corresponding to the outer gear ring (15), of the base (1), the motor (17) is connected with a power supply through a controller, and a gear (18) fixedly connected with an output shaft of the motor (17) is meshed with the outer gear ring (15); one end of the rotating shaft (12) extending into the furnace body (13) is provided with a bearing frame (19) for placing a workpiece; iron sand is filled in the furnace body (13); a vent hole (2) is arranged in the rotating shaft (12), one end of the vent hole (2) is communicated with the interior of the furnace body (13), and the other end of the vent hole is communicated with carburizing gas through a pipeline and a valve; the heating efficiency of the workpiece is increased by the rotation of the iron sand along with the furnace body (13), and further the carburizing efficiency of the workpiece is increased.
2. The heat treatment carburizing process for high temperature carburized steel H10Cr4Mo4Ni4V according to claim 1, characterized in that: the bearing frame (19) is fixedly connected with the rotating shaft (12) through an L-shaped connecting rod (21), and the connecting rod (21) is used for reducing the height of the bearing frame (19) and increasing the burial depth of iron sand on a workpiece.
3. The heat treatment carburizing process for high temperature carburized steel H10Cr4Mo4Ni4V according to claim 2, characterized in that: a group of splayed partition plates (22) are uniformly distributed on the inner circumference of the furnace body (13), the flowing speed of iron sand is increased through the partition plates (22), and the heating efficiency of a workpiece is further increased.
4. The heat treatment carburizing process for high temperature carburized steel H10Cr4Mo4Ni4V according to claim 3, characterized in that: a funnel (24) is connected above the bearing frame (19) through a support rod (23), and a first hole (25) communicated with the vent hole (2) is formed in the support rod (23); set up orifice (26) that the opening is down on branch (23) of funnel (24) bottom, orifice (26) and a hole (25) intercommunication blow off high-speed air current through a hole (25) and drive the iron sand and hit the work piece, increase the clearance to the work piece surface.
5. The heat treatment carburizing process for high temperature carburized steel H10Cr4Mo4Ni4V according to claim 4, characterized in that: the iron sand is doped with steel balls (27), and the diameter of each steel ball (27) is smaller than that of each hopper (24) and each spray hole (26); a set of sieve holes (28) are formed in one side, close to the inner wall of the furnace body (13), of the partition plate (22), the diameter of each sieve hole (28) is larger than the diameter of iron sand and smaller than the diameter of the steel ball (27), the steel ball (27) is used for striking a workpiece, the internal stress of the workpiece is eliminated, and the fatigue resistance of the workpiece is improved.
6. The heat treatment carburizing process for high temperature carburized steel H10Cr4Mo4Ni4V according to claim 5, characterized in that: no. two holes (3) communicated with the vent holes (2) are formed in the connecting rod (21), a group of No. three holes (31) communicated with the lower surface of the connecting rod (21) are formed in the No. two holes (3), and the flowability of iron sand is further improved through air flow sprayed out of the No. three holes (31), so that the carburizing efficiency of the workpiece is improved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010605762.XA CN111809136A (en) | 2020-06-29 | 2020-06-29 | Heat treatment carburizing process of high-temperature carburizing steel H10Cr4Mo4Ni4V |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010605762.XA CN111809136A (en) | 2020-06-29 | 2020-06-29 | Heat treatment carburizing process of high-temperature carburizing steel H10Cr4Mo4Ni4V |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111809136A true CN111809136A (en) | 2020-10-23 |
Family
ID=72856218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010605762.XA Pending CN111809136A (en) | 2020-06-29 | 2020-06-29 | Heat treatment carburizing process of high-temperature carburizing steel H10Cr4Mo4Ni4V |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111809136A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113755791A (en) * | 2021-09-02 | 2021-12-07 | 溧阳市中豪热处理有限公司 | Nitriding furnace with airflow diversion and circulation functions for wind power products and using method thereof |
| CN114196904A (en) * | 2021-11-23 | 2022-03-18 | 马雅盛 | Medium frequency induction carburizing furnace |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07300607A (en) * | 1994-04-27 | 1995-11-14 | Toyota Autom Loom Works Ltd | Method for melting cast iron and carburizing unit |
| KR20040043324A (en) * | 2002-11-18 | 2004-05-24 | 에프에이지베어링코리아유한회사 | steel for bearing and heat treatment method thereof |
| CN1696327A (en) * | 2004-05-15 | 2005-11-16 | 洛阳轴承集团有限公司 | Carburization technique of heat treatment for high temperature carburized steel (H10CrMo4Ni4V) |
| JP2007284739A (en) * | 2006-04-14 | 2007-11-01 | Sumitomo Metal Ind Ltd | Steel component and its production method |
| CN104726819A (en) * | 2015-03-20 | 2015-06-24 | 上海人本集团有限公司 | Heat treatment carburization process of carburizing steel |
| CN110670012A (en) * | 2019-10-10 | 2020-01-10 | 淄博大亚金属科技股份有限公司 | Carburizing steel shot and production device thereof |
| CN111218551A (en) * | 2020-03-03 | 2020-06-02 | 贾春腾 | Heat treatment process for clutch disc hub |
-
2020
- 2020-06-29 CN CN202010605762.XA patent/CN111809136A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07300607A (en) * | 1994-04-27 | 1995-11-14 | Toyota Autom Loom Works Ltd | Method for melting cast iron and carburizing unit |
| KR20040043324A (en) * | 2002-11-18 | 2004-05-24 | 에프에이지베어링코리아유한회사 | steel for bearing and heat treatment method thereof |
| CN1696327A (en) * | 2004-05-15 | 2005-11-16 | 洛阳轴承集团有限公司 | Carburization technique of heat treatment for high temperature carburized steel (H10CrMo4Ni4V) |
| JP2007284739A (en) * | 2006-04-14 | 2007-11-01 | Sumitomo Metal Ind Ltd | Steel component and its production method |
| CN104726819A (en) * | 2015-03-20 | 2015-06-24 | 上海人本集团有限公司 | Heat treatment carburization process of carburizing steel |
| CN110670012A (en) * | 2019-10-10 | 2020-01-10 | 淄博大亚金属科技股份有限公司 | Carburizing steel shot and production device thereof |
| CN111218551A (en) * | 2020-03-03 | 2020-06-02 | 贾春腾 | Heat treatment process for clutch disc hub |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113755791A (en) * | 2021-09-02 | 2021-12-07 | 溧阳市中豪热处理有限公司 | Nitriding furnace with airflow diversion and circulation functions for wind power products and using method thereof |
| CN113755791B (en) * | 2021-09-02 | 2024-02-23 | 溧阳市中豪热处理有限公司 | Nitriding furnace with airflow diversion circulation function for wind power product and use method of nitriding furnace |
| CN114196904A (en) * | 2021-11-23 | 2022-03-18 | 马雅盛 | Medium frequency induction carburizing furnace |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111809136A (en) | Heat treatment carburizing process of high-temperature carburizing steel H10Cr4Mo4Ni4V | |
| CN100422351C (en) | Stepped quenching process and its apparatus suitable for bainite and martensite quenching | |
| CN101058865A (en) | Supersaturated carburizing steel | |
| CN111154953B (en) | Heat treatment method for improving comprehensive mechanical property of GCr15 steel | |
| CN106048191B (en) | A kind of Technology for Heating Processing for reducing industrial robot and being deformed with spiral bevel gear | |
| CN108384934A (en) | A kind of glowing furnace used for metal thermal treatment | |
| CN101928818A (en) | Rapid air cooling device for hollow pipe-shaped heat-treated product | |
| CN1813163A (en) | Gas cooling type vacuum heat treating furnace and cooling gas direction switching device | |
| CN110004276A (en) | A kind of annealing device of highly wear-resisting alloy steel | |
| CN106048195A (en) | Heat treatment technology for reducing deformation of GCr15 thin-wall conical ring | |
| CN1179877C (en) | Mechanical method and special mechanical equipment for forming nanometer structure | |
| CN113322372A (en) | Engine cylinder cover and preparation method thereof | |
| CN112111641A (en) | Heat treatment method of thick-wall L80-13Cr seamless steel tube | |
| CN106868271B (en) | A kind of mining scraper machine casting ledge subregion differential quenching unit and process | |
| CN217103984U (en) | Spring steel wire quenching device for cryogenic process | |
| CN208121145U (en) | A kind of glowing furnace used for metal thermal treatment | |
| CN213835433U (en) | Annealing device for heat treatment of flange plate | |
| CN107236858B (en) | A kind of I. C. engine crankshaft quenching coolant liquid treatment box and its application method | |
| CN106498132B (en) | High-pressure gas quenching process for die | |
| CN216039712U (en) | Effectual vertical controllable atmosphere multi-purpose stove | |
| CN111218551B (en) | Heat treatment process for clutch disc hub | |
| CN201411479Y (en) | Compulsory convection device for titanium coil annealing in horizontal vacuum annealing furnace | |
| CN114166605A (en) | Method for simulating and predicting core structure performance of large-size CrMo steel component | |
| CN203034103U (en) | Hot air injection heating and shot blasting energy injection chemical heat treatment furnace | |
| CN220507435U (en) | Cooling component |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |