CN108505032A - A method of it repairs and reinforcing crankshafts forging mold surface - Google Patents
A method of it repairs and reinforcing crankshafts forging mold surface Download PDFInfo
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- CN108505032A CN108505032A CN201810169312.3A CN201810169312A CN108505032A CN 108505032 A CN108505032 A CN 108505032A CN 201810169312 A CN201810169312 A CN 201810169312A CN 108505032 A CN108505032 A CN 108505032A
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000005242 forging Methods 0.000 title claims abstract description 33
- 230000008439 repair process Effects 0.000 title claims abstract description 21
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 16
- 239000011324 bead Substances 0.000 claims abstract description 15
- 238000011282 treatment Methods 0.000 claims abstract description 9
- 239000002184 metal Substances 0.000 claims abstract description 6
- 229910052751 metal Inorganic materials 0.000 claims abstract description 6
- 238000003466 welding Methods 0.000 claims description 43
- 230000008569 process Effects 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000005121 nitriding Methods 0.000 claims description 10
- 230000003647 oxidation Effects 0.000 claims description 9
- 238000007254 oxidation reaction Methods 0.000 claims description 9
- 238000010583 slow cooling Methods 0.000 claims description 7
- 230000000903 blocking effect Effects 0.000 claims description 6
- 239000010410 layer Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 5
- 206010011376 Crepitations Diseases 0.000 claims description 3
- 208000037656 Respiratory Sounds Diseases 0.000 claims description 3
- 230000001590 oxidative effect Effects 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 238000010792 warming Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000011229 interlayer Substances 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 230000002000 scavenging effect Effects 0.000 claims description 2
- 239000002893 slag Substances 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims description 2
- 238000005496 tempering Methods 0.000 claims description 2
- 229910052738 indium Inorganic materials 0.000 claims 3
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 238000005516 engineering process Methods 0.000 abstract description 9
- 238000005299 abrasion Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 abstract 1
- 239000010959 steel Substances 0.000 abstract 1
- 230000008901 benefit Effects 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000009497 press forging Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
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
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
-
- 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
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- 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
- C23C8/10—Oxidising
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/40—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions
- C23C8/42—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions only one element being applied
- C23C8/48—Nitriding
- C23C8/50—Nitriding of ferrous surfaces
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Forging (AREA)
Abstract
The present invention relates to a kind of methods of reparation and reinforcing crankshafts forging mold surface, belong to mold re-manufacturing technology field.The process step of the invention includes (one) Bead weld repair, (two) QPQ processing reinforcings, is mainly used for solving the problems, such as that existing forging mold directly uses the 5CrNiMo steel service life relatively low.After Bead weld repair+surface QPQ intensive treatments of the present invention, surface abrasion resistance is greatly improved deposited metal, and die life improves 50% or so, and production cost is greatly saved, with good economic efficiency.
Description
Technical field
The present invention relates to mold re-manufacturing technology fields, and in particular to a kind of to repair and reinforcing crankshafts forging mold surface
Method.
Background technology
Built-up welding refers to that the alloy material with certain performance is deposited over fertile material by certain heat source means
Surface, to assign base material Special use performance or part is made to restore the process of original geomery.Built-up welding re-manufacturing technology
Mold Bead weld repair or manufacture in be with a wide range of applications, the present invention used in resurfacing welding material mainly for the manufacture of
The large-scale mechanical press forging die bridge portion of the material manufactures such as 5CrNiMo, H13, it can also be used to the hot extruding dies of the material manufactures such as H13, plug and
Heat Working Rolls etc. wear by force surfacing manufacturing and the reparation that high hot forming position is required with thermal fatigue resistance.Mold stack wlding
Material ensures built-up welding gold by modes such as the solution strengthening of alloying element be added, ageing strengthening, precipitation strength and dispersion-strengthernings
Accessory has enough elevated temperature strengths, high-temperature resistant tempered and other comprehensive performance.
QPQ Quench-Polish-Quench technology technologies be it is a kind of can simultaneously workpiece surface realize C, N, O permeation metal surface it is strong
Change modification technology." QPQ " is the abbreviation of English alphabet " Quench-Polish-Quench ", and its essence is total by salt bath nitrogen carbon
The compound of liquid oxidizing-polishing-secondary oxidation is blended, reaching improves metal surface wearability and corrosion proof purpose.Material passes through
After QPQ processing, the high and fine and close infiltration layer of hardness can be formed on surface, can significantly improve the wearability of material, to improve
The comprehensive performance of material.Have many advantages, such as that deformation is small, performance is good, environmental pollution is small by the QPQ workpiece handled.It is based on
This, QPQ treatment technologies are widely used in automobile, locomotive, engineering machinery, light industry machinery, agricultural machinery, instrument and meter and work mould
The industries such as tool.
Mold work environment determines that used resurfacing welding material hardness is high, and postwelding processing difficulties, increase is caused to be produced into
This.The existing method for improving build-up welding repair process is first to carry out built-up welding using the lower resurfacing welding material of hardness so that latter one
Machining processes are easy to carry out, and eliminate internal stress to resurfacing welding material progress temper after completing machining so that mold is whole
Reach work and requirement.Since the working environment of mold analysis it is found that its failure mainly by surface, surface building ring
Border requires it to have better organization and performance, and it is good to propose that the method for remanufacturing rear surface nitriding using built-up welding obtains by the present invention thus
Good tissue and performance is to improve die life.
Currently, domestic forging industry starts to pay attention to application of the surface carburization technology on forging mold.Such as Chongqing great river,
The companies such as east wind forging, southern vapour forging, Guilin Fuda have just applied Nitrizing Treatment technique on the mold of surfacing manufacturing.It is raw
Production the result shows that, nitriding mold can be improved for 50% or more service life.
Invention content
The purpose of the present invention is to provide the surface QPQ processing methods of mold resurfacing welding material, and resurfacing welding material is through QPQ processing
Afterwards, its wearability and corrosion resistance can be significantly improved, its service life during forging is enhanced, there is good economic effect
Benefit.
For achieving the above object, technical solution provided by the invention is：
A method of reparation and reinforcing crankshafts forging mold surface comprise the following steps that：(1) Bead weld repair：
The first step：Select the 5CrNiMo crankshaft forging molds scrapped as base material, heat treatment hardness is 32~40HRC, is waited for
The tool that repairs a die is downward, processes 20mm or so outward and roots out fatigue layer, roots out all crackles, and mold is warming up to 450 DEG C of guarantors with stove
Temperature, soaking time carry out the pre-heat treatment in 8 hours or so；
Second step：Select electrogas process build-up welding mould；
Third walks：Use the prime coat for 2~4mm of wlding built-up welding that hardness is 33~37HRC, mended crack；
4th step：The transition zone that the wlding built-up welding thickness for the use of hardness being 44~48HRC is 6~8mm, wherein blocking are used for
Built-up welding bridge portion 16mm is hereinafter, finish-forging is used for built-up welding bridge portion 18mm or less；
5th step：The working lining of 10~12mm of wlding built-up welding with hardness more than 50HRC, wherein blocking are used for built-up welding bridge portion
16mm is hereinafter, finish-forging is used for built-up welding bridge portion 18mm or less；
6th step：Postwelding is tempered；
7th step：It is processed into bent axle work cavity as required；
(2) QPQ processing is strengthened：
The first step：Mold is placed on 20~30min of cleaning in 70 DEG C of warm water, as when mold is dirtier, and cleaning is appropriately extended
Between；
Second step：It is preheated in preheating furnace after mold clean, 380 DEG C of preheating temperature, preheating time is true according to mold tonnage
It is fixed：6300t below is 45min, and 8000t or more is 1.5h；
Third walks：By mold in nitriding furnace middle carry out Nitrizing Treatment：Temperature be 540 DEG C~560 DEG C, the time be 2.5h~
4h；
4th step：Mold after nitridation is placed in oxidation furnace and carries out oxidation processes：Oxidizing temperature is 380 DEG C~390 DEG C,
Time is 15min~30min；
5th step：Mold after oxidation is put into incubator slow cooling and is cleaned to 70 DEG C or less.
In Bead weld repair, in the electrogas process described in second step, technological parameter is：Electric current：360~540A, electricity
Pressure：30~38V, wire feed rate：35~40cmmin-1, extend 18~20mm；Protective gas：Ar is 85% or so, CO2For
15% or so.
In Bead weld repair, in the electrogas process described in second step, CO2Gas vent must connect heater；Often weld
One layer of metal is carefully tapped with pneumatic pick and derusting needle once, to eliminate stress and welding slag；Interlayer temperature cannot be below 300 DEG C.
In Bead weld repair, the wlding that the third step hardness is 33~37HRC is RMD535；Hardness described in 4th step
Wlding for 44~48HRC is RMD545；Wlding of the hardness more than 50HRC described in 5th step is RMD650.
In Bead weld repair, the postwelding tempering described in the 6th step needs to formulate corresponding technique according to the tonnage of mold：
1) 4000T/6300T molds：550 DEG C × 12h is carried out once to be heat-treated；
2) 8000T molds：550 DEG C × 8h of progress is heat-treated twice or 550 DEG C × 15h is once heat-treated；
3) 14000T molds：550 DEG C × 12h is carried out to be heat-treated twice.
Further, when 550 DEG C × 8h of 8000T molds progress is heat-treated twice, wherein heat treatment rear mold needs for the first time
Slow cooling carries out second of heat treatment again to 150 DEG C.
Further, when 550 DEG C × 12h of 14000T molds progress is heat-treated twice, wherein heat treatment rear mold for the first time
Slow cooling is needed to carry out second of heat treatment again later to 150 DEG C.
3~5 molds, which are often oozed, during QPQ processing is strengthened, in the third step nitriding process nitriding furnace detects a CNO-
Content controls in 34%~37% range.
The present invention has the advantages that compared with the prior art：
After Bead weld repair+surface QPQ intensive treatments of the present invention, surface abrasion resistance is significantly carried deposited metal
Height, die life improves 50% or so, production cost is greatly saved, with good economic efficiency.
Description of the drawings：
Fig. 1 is the metallograph after the QPQ process of embodiment 1.
Fig. 2 is the metallograph after the QPQ process of embodiment 2.
Fig. 3 is the metallograph after the QPQ process of embodiment 3.
Fig. 4 is the metallograph after the QPQ process of embodiment 4.
Specific implementation mode
The present invention is further explained in the light of specific embodiments.
Embodiment 1:
Bead weld repair：
1) select the 5CrNiMo crankshaft forging molds scrapped as base material, heat treatment hardness is 32~40HRC.It waits repairing a die
Tool is downward, processes outward 20mm or so (rooting out fatigue layer), roots out all crackles.Mold is warming up to 450 DEG C of heat preservations with stove, is protected
8 hours or so warm time carried out the pre-heat treatment.
2) electrogas process build-up welding mould is selected.
3) it is the prime coat of 2~4mm of wlding built-up welding of 33~37HRC, mended crack to use hardness.
4) transition zone that the wlding built-up welding thickness for the use of hardness being 44~48HRC is 6~8mm.Blocking：For built-up welding bridge portion
16mm or less.Finish-forging：For built-up welding bridge portion 18mm or less.
5) working lining of 10~12mm of wlding built-up welding with hardness more than 50HRC.Blocking：For built-up welding bridge portion 16mm with
Under；Finish-forging：For built-up welding bridge portion 18mm or less.
6) postwelding is tempered.
7) it is processed into bent axle work cavity as required.
QPQ processing is strengthened：
1) mold is placed on 20~30min of cleaning in 70 DEG C of warm water, scavenging period is appropriately extended as mold is dirtier.
2) it is preheated in preheating furnace after crankshaft forging mold cleaning, 380 DEG C of preheating temperature, preheating time is according to mold tonnage
It determines：6300t below is 45min, and 8000t or more is 1.5h.
3) Nitrizing Treatment is carried out in the cyanate radical type base salt by die crank in nitriding furnace：Temperature is 540 DEG C, and the time is
150min nitrogenizes concentration 34%.
4) mold after nitridation is placed in oxidation furnace and carries out oxidation processes：Oxidizing temperature is 390 DEG C, time 15min.
5) mold after aoxidizing is put into incubator slow cooling and is cleaned to 70 DEG C or less.
The running parameter feature of embodiment 2~4 is shown in Table 2, other are the same as embodiment 1.
Resurfacing welding material RMD650 chemical compositions of the present invention are as shown in table 1, and QPQ treatment process is shown in Table 2, and performance is relatively shown in Table 3.
1 resurfacing welding material RMD650 chemical compositions of table
| C | Cr | Mo | Ni | Fe |
| 0.30% | 10% | 2.5% | 2% | Surplus |
2 QPQ treatment process comparison sheets of table
3 performance comparison sheet of table
As shown in Table 3, compared with base material, by QPQ, treated that sample hardness greatly improves.When nitriding temperature is 540
DEG C~560 DEG C, when nitridation time is 2~4h, it can get the preferable infiltration layer of quality.Table 4 is the forging mold longevity handled without QPQ
Life, the service life of mold is at 4500~6000 as seen from table.Table 5 is that crankshaft forging mold under the conditions of embodiment 3 forges the longevity
Life, as shown in Table 5, after QPQ is handled the forging mold service life be increased to 8000~9000.Therefore, through QPQ treated built-up welding
Mold can be used for wearing under operating condition by force.
4 built-up welding of table remanufactures mold and forges the service life
Table 5 QPQ processing rear mold forges the service life
The above is only presently preferred embodiments of the present invention, is not intended to limit the present invention in any form, any ripe
Professional and technical personnel is known, without departing from the scope of the present invention, according to the technical essence of the invention, to above real
Apply any simple modification, equivalent replacement and improvement etc. made by example, still fall within technical solution of the present invention protection domain it
It is interior.
Claims (9)
1. a kind of method of reparation and reinforcing crankshafts forging mold surface, it is characterised in that：It comprises the following steps that：(1) heap
Repair welding is multiple
The first step：Select the 5CrNiMo crankshaft forging molds scrapped as base material, heat treatment hardness is 32~40HRC, waits repairing a die
Tool is downward, processes 20mm or so outward, roots out all crackles, and mold is warming up to 450 DEG C of heat preservations with stove, soaking time 8 is small
When or so carry out the pre-heat treatment；
Second step：Select electrogas process build-up welding mould；
Third walks：Use the prime coat for 2~4mm of wlding built-up welding that hardness is 33~37HRC, mended crack；
4th step：The transition zone that the wlding built-up welding thickness for the use of hardness being 44~48HRC is 6~8mm, wherein blocking are used for built-up welding
Bridge portion 16mm is hereinafter, finish-forging is used for built-up welding bridge portion 18mm or less；
5th step：The working lining of 10~12mm of wlding built-up welding with hardness more than 50HRC, wherein blocking are used for built-up welding bridge portion 16mm
Hereinafter, finish-forging is used for built-up welding bridge portion 18mm or less；
6th step：Postwelding is tempered；
7th step：It is processed into bent axle work cavity as required；
(2) QPQ processing is strengthened：
The first step：Mold is placed on 20~30min of cleaning in 70 DEG C of warm water, scavenging period is appropriately extended as mold is dirtier；
Second step：It is preheated in preheating furnace after mold clean, 380 DEG C of preheating temperature, preheating time determines according to mold tonnage：
6300t below is 45min, and 8000t or more is 1.5h；
Third walks：By mold in nitriding furnace middle carry out Nitrizing Treatment：Temperature is 540 DEG C~560 DEG C, and the time is 2.5h~4h；
4th step：Mold after nitridation is placed in oxidation furnace and carries out oxidation processes：Oxidizing temperature is 380 DEG C~390 DEG C, the time
For 15min~30min；
5th step：Mold after oxidation is put into incubator slow cooling and is cleaned to 70 DEG C or less.
2. the method for reparation and reinforcing crankshafts forging mold surface according to claim 1, it is characterised in that：Bead weld repair
In, in the electrogas process described in second step, technological parameter is：Electric current：360~540A, voltage：30~38V, wire feed speed
Degree：35~40cmmin-1, extend 18~20mm；Protective gas：Ar is 85% or so, CO2It is 15% or so.
3. the method for reparation and reinforcing crankshafts forging mold surface according to claim 1, it is characterised in that：Bead weld repair
In, in the electrogas process described in second step, CO2Gas vent must connect heater；Often weld one layer of metal, with pneumatic pick and
The needle that derusts carefully taps once, to eliminate stress and welding slag；Interlayer temperature cannot be below 300 DEG C.
4. the method for reparation and reinforcing crankshafts forging mold surface according to claim 1, it is characterised in that：Bead weld repair
In, the wlding that the third step hardness is 33~37HRC is RMD535；The weldering that hardness described in 4th step is 44~48HRC
Material is RMD545；Wlding of the hardness more than 50HRC described in 5th step is RMD650.
5. the method for reparation and reinforcing crankshafts forging mold surface according to claim 1, it is characterised in that：Bead weld repair
In, the ratio that third walks wlding used in the~the five step is generally 3:7:10.
6. the method for reparation and reinforcing crankshafts forging mold surface according to claim 1, it is characterised in that：Bead weld repair
In, the postwelding tempering described in the 6th step needs to formulate corresponding technique according to the tonnage of mold：
1) 4000T/6300T molds：550 DEG C × 12h is carried out once to be heat-treated；
2) 8000T molds：550 DEG C × 8h of progress is heat-treated twice or 550 DEG C × 15h is once heat-treated；
3) 14000T molds：550 DEG C × 12h is carried out to be heat-treated twice.
7. the method for reparation and reinforcing crankshafts forging mold surface according to claim 5, it is characterised in that：8000T moulds
When 550 DEG C × 8h of tool progress is heat-treated twice, wherein heat treatment rear mold needs slow cooling to carry out second of heat again to 150 DEG C for the first time
Processing.
8. the method for reparation and reinforcing crankshafts forging mold surface according to claim 5, it is characterised in that：14000T moulds
Tool carries out 550 DEG C × 12h when being heat-treated twice, wherein heat treatment rear mold needs slow cooling to carrying out the after 150 DEG C again for the first time
Secondary heat treatment.
9. the method for reparation and reinforcing crankshafts forging mold surface according to claim 1, it is characterised in that：QPQ processing
3~5 molds, which are often oozed, in reinforcing, in the third step nitriding process nitriding furnace detects a CNO-Content is controlled 34%
In~37% range.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810169312.3A CN108505032A (en) | 2018-02-28 | 2018-02-28 | A method of it repairs and reinforcing crankshafts forging mold surface |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110919215A (en) * | 2019-12-18 | 2020-03-27 | 郑州煤机格林材料科技有限公司 | Die welding process |
| CN112025202A (en) * | 2020-08-21 | 2020-12-04 | 广东粤江鸿锐电力科技发展有限公司 | Method for repairing straight gear |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110919215A (en) * | 2019-12-18 | 2020-03-27 | 郑州煤机格林材料科技有限公司 | Die welding process |
| CN112025202A (en) * | 2020-08-21 | 2020-12-04 | 广东粤江鸿锐电力科技发展有限公司 | Method for repairing straight gear |
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