CN1186865A - Die and quenching method of the same - Google Patents
Die and quenching method of the same Download PDFInfo
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- CN1186865A CN1186865A CN97118690A CN97118690A CN1186865A CN 1186865 A CN1186865 A CN 1186865A CN 97118690 A CN97118690 A CN 97118690A CN 97118690 A CN97118690 A CN 97118690A CN 1186865 A CN1186865 A CN 1186865A
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Abstract
To provide a die improved in toughness by suppressing bainite transformation, improved in heat crack resistance, reduced in finishing margin by reducing heat treatment distortion and dimensional change in heat treatment and capable of prolonging the service life of the die, and to provide the hardening method therefor. In this die in which a bainite structure precipitated down to an inside of 40mm from the surface of the die subjected to vacuum hardening is <=20&mu m length, <=2&mu m width, a warp and a shrinkage rate in the longitudinal direction of the die, which are detected at the bottom face of the die vacuum hardened, are respectively <=0.2%, 0.15%. Further, in this hardening method to cool by blowing a cooling gas for the die heated in vacuum, a pressure of the cooling gas is increased before starting bainite transformation in the course of cooling.
Description
The present invention relates to improve the flexible mould, in this mould because the thermal treatment relevant with the mold heat steel, particularly distortion and the stress that causes with the relevant thermal treatment of adopting vacuum quencher is suppressed as small as possible, the invention still further relates to the quenching method of this mould.
In the customary quenching of mould etc., usually in the initial high temperature section of cooling stages fast with its cooling do not separate out so that do not cause carbide and troostite, then in the low-temperature zone in supercooled austenite district, slowly with its cooling, to prevent the quenching crack generation and martensitic transformation is carried out gently.
But find: when when above-mentioned high temperature section is cooled off fast, metal die is easily deformable, and since in low-temperature zone with its mild cooling, so bainite is easy to produce, and toughness reduces.Therefore, adopt now such quenching method always: high temperature section with do not produce carbide and troostite than lower velocity with mold cools down, and fast its cooling is separated out to prevent bainite structure in low-temperature zone.
Be exposed to molten aluminum liquid repeatedly owing to be used for the mould of aluminum dipping form notes, the surface of mould is easy to produce thermal crack because of thermal fatigue, and such rough sledding occurs always: when thermal crack develops into the crackle in big gap, just transfer on the product; When this metal die in its use, under the situation that thermal crack deepens, metal die is very easy to break.
For generation and the development that suppresses thermal crack, as known, it is effective improving its intensity by increase mould hardness.On the other hand, under the situation that increases hardness simply, the toughness of material descends, and produced misgivings thus: little thermal crack develops into big crackle suddenly.In order to increase hardness, keep toughness simultaneously, as is known, die quenching so that having more tiny tissue (martensitic stucture or needle-like lower bainite tissue) and suppress to go up (bulk) bainite structure, it need be produced as few as possible.
For satisfying this requirement, need to adopt the rapid quenching method of cooling, but digital-to-analogue injection molding tool generally have complicated shape, uneven thickness and little machining allowance mostly.Owing to be easy to break or be out of shape at the such mould of rapid quenching cooling stages quenching, so use such method usually, it may further comprise the steps: in vacuum oven with mold heated, when being in high temperature, it from vacuum oven, it is taken out, from the quenching temperature cooling of drying, and measurements distortion in cooling stages is simultaneously operated in control to the blowing of mould.So this quenching method needs the skill of heat-resisting operation and height.
In addition, the blowing cooling can not provide enough speed of cooling, and the decarburization of die surface part takes place in the cooling stages process inevitably.The surface of the mould with little machining allowance is partly stayed in decarburization, and the generation of promotion thermal crack, shortened life span of mold thus, and cause such shortcoming: Decarburized layer can become in the reason such as the big crackle of the water-cooled hole inner portion of mould injection molding tool, and this makes it can not stand last processing after thermal treatment.
For above-mentioned two reasons, quench molds injection molding tool also adopts vacuum heat treatment now, to prevent its decarburization and the last processing after the thermal treatment is reduced to minimum.The rare gas element by the nitrogen representative is generally used in cooling in vacuum heat treatment furnace, and because cooling power increases by the pressure that improves this gas, so use high pressure at present in above-mentioned vacuum oven, cools off as 6 crust and 10 gases that cling to.
But, these plans are adopted, simultaneously with this high pressure gas refrigerative vacuum oven, mainly be that design comes and is used to have little rapid tool steel to intermediate diameters (the about 5-50mm of diameter), thereby under big mould situation, as have under the mould injection molding tool situation of complicated shape and big thickness difference and be easy to produce inhomogeneous speed of cooling, and these vacuum ovens are using under the condition unsatisfactorily at present from the viewpoint that produces bainite structure and distortion.
And then, in conventional vacuum is quenched,, the cooling gas that is incorporated in this stove is passed through heat exchanger cooling after blowing cold gas for recycling.Like this because this gas is in low temperature because of adiabatic expansion, so after it is introduced in the stove immediately just fast with mold cools down, but, after this cooling gas that is re-used depends on the ability of heat exchanger and heating, thereby is re-using under the situation of this cooling gas, and speed of cooling often diminishes.
Under these circumstances, cool off easily deformable or warpage (camber) at initial cooling stages mould because of quick, and because the cooling stages in the back makes bainite structure be easy to separate out because of speed of cooling is not enough.For avoiding this disadvantageous situation, as mentioned above, after mould is heated in a vacuum and takes out from stove, come it is quenched by blowing cooling and adjusting speed of cooling.But this method during cooling causes the mould decarburization.
In addition, as with vacuum oven to big product, the general technology when quenching as mould injection molding tool, it is with the mould slow cooling in high temperature section that a kind of known method is arranged, and in low-temperature zone that it is cold soon, use the combination (Japanese Patent Application Publication No.8-67909) of air cooling and oil cooling simultaneously.But, this method disadvantageously, its needs extensive cooling apparatus and removes the cleaning operation that is bonded at the oil of die surface when oil cooling.
The objective of the invention is to address these problems: be easy to increase die deformation and be easy to produce bainite structure because of cooling off fast, use the above-mentioned high pressure gas refrigerative excellent properties relevant simultaneously, that is, use cooling not decarburization of while at a high speed with vacuum oven.
Just, because through many experiments, the present invention just is accomplished, it has solved the problem that produces in the vacuum heat treatment of the hot-work die steel that is used as mould notes or hot forged mould, and the object of the present invention is to provide and have the mould that toughness and heat resistanceheat resistant are split, the both improves by suppressing bainite transformation, thereby reduces machining allowance by reducing the distortion or the dimensional change that produce because of thermal treatment, and prolongs the work-ing life of mould.The present invention also provides the quenching method of this mould.
Based on the contriver's who the following describes discovery, and finished the present invention.Above-mentioned discovery obtains by various experiments and check, can solve the problem in the above-mentioned vacuum heat treatment furnace effectively.
Fig. 1 is illustrated in the vacuum oven that has with high pressure gas refrigerative structure, the relation curve between gaseous tension and the speed of cooling.The speed of cooling of material can change widely according to gaseous tension as known in the figure.Generally, need the material of high speed of cooling to cool off with high pressure gas, and the material that does not need high speed of cooling is with the lower gas cooling of pressure ratio, this is mainly and prevents distortion, as warpage.
On the other hand, be that heat release changes because bainite transformation is different from martensitic transformation, this heat release during bainite transformation of material.This bainite transformation has the heat release value of about 18cal/g, and it is significantly greater than the heat release value of 5cal/g or littler martensitic transformation.Therefore, as shown in Figure 2, producing under the situation of bainite owing to speed of cooling is not enough, it is big that calorific value becomes, thereby make cooling may stop near bainite transformation point, or temperature may be raise, and makes speed of cooling in its vicinity more not enough thus.Fig. 3 shows explanation by the time of bainite transformation district needs and the graphic representation that concerns between the Charpy impact value (Charpy impact value) in quench cooled stage.Under the long bainite transformation situation of cost, toughness significantly reduces.But, even under the situation that bainite transformation began in the quench cooled stage, can obtain high tenacity by after this cooling off fast also.
Introduce new cooling gas and improve gaseous tension between in due course, improving speed of cooling in the bainite transformation district is possible with the generation that suppresses bainite structure.
Owing to introduce gas heating after being used to cool off mould to be processed of vacuum oven cooling chamber,, after this be used for cooling die again so this gas is sent into heat exchanger and cool off once more.But heavier at mould, under the situation as mould injection molding tool, the capacity of heat exchanger becomes not enough in the cooling stages process, and mould may thus, can not be obtained needed speed of cooling by cold inadequately gas cooling.This aspect causes that near bainite transformation point speed of cooling reduces.The present invention also notices this relation and is accomplished.
In this case, cooling power can be improved once more by the cooling gas of pressurization is incorporated at cooling stages in the cooling room of vacuum oven midway.Find that very gratifying toughness value can obtain by the quick cooling in the bainite transformation district simply, and finds that the bainite structure size is little in this case.Also find, it seems that from distortion and toughness viewpoint fabulous mould can quick cooling obtains by the cooling relatively more slow in the high-temperature zone with in the bainite transformation district.
Because The above results, the inventor finds: just in vacuum oven, use the high pressure gas refrigerative for hot-work die steel die complex-shaped and that thickness difference is big simultaneously, thermal treatment as casting die mould, importantly, carry out quite slow cooling in the high-temperature zone that is easy to deform because of thermal stresses, and carry out in the bainite transformation district that obviously influences toughness of material cold soon, thereby finished the present invention.
Particularly, according to the present invention, the degree of depth (thickness) is characterised in that greater than the mould of 40mm: have each crystal grain with bainite structure of separating out the position in the scope dark from the vacuum hardening die surface to 40mm (promptly, the ferritic acicular grains of supersaturation) length is not more than 20 μ m, the wide 2 μ m that are not more than.In mould of the present invention, the amount of deflection (camber) that measures on vertically in the mould bottom surface of vacuum hardening is not more than 0.2%, is suitable and be not more than 0.15% at this sagging degree (shrinkage) on vertically.Be preferably: in mould of the present invention, the surperficial position that has kept this vacuum hardening mould on the surface after the thermal treatment does not have decarburization or carburizing.
In addition, heated die in a vacuum of the present invention is characterised in that by blowing cooling gas refrigerative die quenching method: the pressure of cooling gas increases in this cooling midway.
In this quenching method, the cooling of mould begins by first cooling gas is introduced in the vacuum oven, further cools off this mould by the secondary cooling gas of introducing pressurization in cooling midway before the mould bainite transformation begins.
In addition, this quenching method feature also is: by with greater than the speed of cooling of the critical cooling velocity of carbide precipitate or troostite not, the first cooling gas of 1-4 crust introduced in the vacuum oven and with the temperature of mold cools down to 650-300 ℃, then be higher than first cooling gas by introducing, the secondary cooling gas of 4-10 crust separates out to prevent bainite.
Fig. 1 is the graphic representation of explanation universal relation between vacuum hardening stage cooling gas pressure and speed of cooling;
Fig. 2 is explanation produces heat in the bainite transformation district in the quench cooled stage a graphic representation;
Fig. 3 is the graphic representation that explanation concerned between speed of cooling and the toughness in the bainite transformation district in the quench cooled stage;
Fig. 4 be explanation in one embodiment of the invention, the graphic representation that between the cooling gas pressure in quench cooled stage and speed of cooling, concerns;
Fig. 5 illustrates on the time temperature transformation curve figure of SKD61 the graphic representation of the cooling time in quenching stage of the present invention as shown in Figure 4;
Fig. 6 is the skeleton view that the size and dimension of mould injection molding tool (formpiston type) used in the embodiment of the present invention is described;
Fig. 7 be the explanation record from the surface of embodying ingot casting mould of the present invention in 40mm depths opticmicroscope microstructure picture.
Fig. 8 is the opticmicroscope microstructure picture of explanation under the surface decarburization state of the ingot casting mould that passes through conventional blowing Cooling Quenching.
In the present invention, each crystal grain with bainite structure limits its length and is not more than 20 μ m, width is not more than 2 μ m, this is because be easy to produce thermal crack because toughness reduces in early days, and the length of the crystal grain of the bainite structure of separating out at die surface is greater than 20 μ m, and width is greater than easily developing into big crackle under the situation of 2 μ m.
In the present invention, the die depth that has suppressed to produce bainite structure is limited to and is not more than 40mm.Because at die depth (thickness) is under the situation of 40mm, may prevents the thermal crack generation or develop into big crackle, so, under the situation of formation coarse grain bainite structure problem does not take place yet even in the part darker than 40mm.
When the vertical deflection of mould surpasses 0.2% and the rate of sinking longitudinally when surpassing 0.15%, need be after thermal treatment repair entire die or configuration shape or size partly by processing eventually, this has increased algorithm, thereby has caused the raising of its manufacturing cost.
Thereby, the amount of deflection of mould and sagging rate be limited to respectively be not more than 0.2% and be not more than 0.15%.If amount of deflection and sagging rate are in above-mentioned limits value, then nearly all mould can use without precision work.
In addition, do not have decarburization and do not have carburizing to mean that hardness and microstructure do not have difference between the heat treatment table face portion of mould inside and outside, and this can be by measuring the further affirmation of hardness most convenient ground of upper space and some configuration part.
And then, in the quenching stage of mould, increase the pressure of the cooling gas that is incorporated into vacuum oven midway in cooling.The cooling gas of introducing vacuum oven and being used for cooling die is delivered to heat exchanger, so that be used for cooling die again.In other words, the cooling gas that is incorporated into vacuum oven circulates between vacuum oven and heat exchanger, still, when mould very big, as if during mould injection molding tool, it becomes not enough with regard to heating and its cooling power.
Therefore, when as mentioned above, when speed of cooling was slow, bainite structure was easy to separate out.But, bainite structure separate out can be by introducing new gas under pressure so that improve cooling speed of cooling midway and prevent.
Before bainite structure is separated out, need to improve the pressure of cooling gas in mould.Cool off and to pass through nose of bainite (bainite nose) as quickly as possible,, also can not be eliminated even improve gaseous tension because in a single day the bainite structure of separating out is after reaching nose of bainite.
The first cooling gas that is used for will being heated at vacuum oven the mold cools down of quenching temperature is used for improving speed of cooling, because when this gas is introduced in the vacuum oven, by adiabatic expansion its temperature is reduced.When the pressure of first cooling gas was the 1-4 crust, it can be separated out mould nose or troostite and separate out before the nose reaching carbide, and this mold cools down has been cold austenitic area.Cool off this mould to be high enough to prevent the speed that carbide or troostite are separated out, be because near these noses, because speed of cooling is too slow, under the situation that carbide or troostite are separated out, make this mould have enough hardness and low toughness is impossible.But, need not with excessive high speed cooling die, this can make mould produce many distortion or warpage after quenching, but is enough with controlled speed of cooling cooling die.
Importantly, before bainite structure is separated out, be the 4-10 crust for preventing that bainite structure from separating out the pressure of the secondary cooling gas of introducing vacuum oven again.The secondary cooling gases that pressure is lower than 4 crust are not enough to prevent that bainite structure from separating out.
Mould by a cooling gas cooling, is reached 650-300 ℃ temperature up to its surface, and this temperature is in so-called supercooled austenite district.By being cooled to 650 ℃ of temperature, making mould separate out the district by carbide or troostite just becomes possibility, and when this die surface was cooled to 300 ℃ temperature, this material internal bainite transformation did not also begin.Therefore, by using the secondary cooling gas cooling to be forwarded to the cooling stages of higher speed of cooling.
In the present invention, term " vacuum " is used for representing to reduce greatly the atmosphere of pressure, and the pressure range that has reduced is preferably 10
-2-10
-4Torr.Be higher than 10
-2Vacuum pressure during heating cause the generation of decarburization, otherwise be lower than 10
-4Vacuum pressure need big equipment, increase the manufacturing cost of mould thus.
Now, it is as follows to be described in detail the present invention with reference to embodiment of the present invention, at first, preparation has the moulding stock of composition as shown in table 1 (SKD61), is processed into the mould notes and uses formpiston, and it is thick that its end is of a size of 200mm * 200mm * 90mm, about 150mm * 150mm * 90mm is thick for its extension size, it is formed on the surface of 200mm * 200mm as shown in Figure 6, forms a groove in the position that is positioned at from stretching out surface measurement 40mm, so that hold the thermopair of measurement or definite speed of cooling.
Table 1
| ??C | ??Si | ??Mn | ??Cr | ??Mo | ????V | ????Fe |
| ?0.37 | ?1.02 | ?0.37 | ?5.35 | ?1.42 | ???0.83 | Surplus |
After armoured thermocouple being inserted in the mould of such acquisition, use the about 0.4m of useful capacity
3(vacuum oven of 600mm * 600mm * 900mm) with this mold heated to predetermined quenching temperature.Vacuum pressure in this vacuum oven is 10
-3Torr.This mould after quenching temperature keeps the scheduled time, is cooled off it by nitrogen blowing.Though cooling can be used rare gas element, as argon gas or helium, the most suitable use of nitrogen, this is because it has than higher cooling power and cheap.
Pressure for cooling gas, under the comparative example situation, begin to finish the gas that always uses 2 crust and 6 crust to cooling from cooling, and mold cools down of the present invention is at first clung to 2 or the gas cooling of 3 crust, this gaseous tension is increased to 6 crust or 8 crust when mould has been cooled to about 450 ℃ then.
For quenching method of the present invention, the secondary air that will meet the amount of pressure increase is introduced again.
Provide the result who schematically is shown in Fig. 4 with inserting the thermocouple measurement speed of cooling in the mould.Being to be understood that by quenching method of the present invention needs about 10 minutes (A) by most important bainite transformation district, and comparative example 1 is needs 15 minutes (B) then, and comparative example 2 needs 30 minutes long time bars (C).
Fig. 5 schematically illustrates by the speed of cooling under the condition of the time temperature transformation curve drafting speed of cooling of SKD61.After quenching is finished, by 580 ℃ * 4 hours double tempering mould is transferred to predetermined hardness HRC48, and the sinkage of Measurement die and amount of deflection.The result who obtains concludes in the table 2.
In the high comparative example 1 of high temperature section speed of cooling, mould significantly is out of shape, thereby needs repairing more or less before use.
Table 2
| Classification | Method of cooling (gaseous tension etc.) | The distortion of mould | ||
| Sink | Amount of deflection | |||
| The present invention | ??1 | 2 crust-6 crust | ??0.25mm(0.12％) | ??0.20mm(0.10％) |
| ??2 | 3 crust-8 crust | ??0.28mm(0.14％) | ??0.25mm(0.12％) | |
| ??3 | 2 crust-8 crust | ??0.22mm(0.11％) | ??0.27mm(0.14％) | |
| ??4 | 3 crust-6 crust | ??0.29mm(0.13％) | ??0.22mm(0.11％) | |
| Comparative example | ??1 | 6 crust | ??0.80mm(0.40％) | ??0.90mm(0.45％) |
| ??2 | 2 crust | ??0.20mm(0.10％) | ??0.20mm(0.10％) | |
With before quenching and the shrinkage value of the mould longitudinal size difference measurements mould after quenching and the tempering, and by mould being installed on the platform of plane and obtaining deflection value with the step that gap gauge is surveyed the gap of two ends generation.
Then, at the position measurement Charpy impact value that is positioned at from the degree of depth 40mm of die surface, and in these parts and die surface observation microstructure.Gained the results are shown in table 3.
Table 3
| Classification | Method of cooling (gaseous tension etc.) | Charpy impact value (J/cm 2) | Crystal grain (in the 40mm depths) with bainite structure | ||
| Maximum length | Maximum width | ||||
| The present invention | ?1 | The 2-6 crust | ????34 | ??18μm | ??1.2μm |
| ?2 | 3 crust-8 crust | ????37 | ??18μm | ??1.1μm | |
| ?3 | 2 crust-8 crust | ????38 | ??16μm | ??1.1μm | |
| ?4 | 3 crust-6 crust | ????34 | ??19μm | ??1.2μm | |
| Comparative example | ?1 | 6 crust | ????37 | ??18μm | ??1.2μm |
| ?2 | 2 crust | ????18 | ??25μm | ??3.0μm | |
Different with the present invention with comparative example 1, in comparative example 2, observe thick bainite structure and little Charpy impact value.Fig. 7 illustrates photo and the synoptic diagram at the part typical microstructures light micrograph of the present invention of dark 40mm and its synoptic diagram and conventional mould, has produced thick bainite structure in this routine mould.Fig. 7 is selected from wherein bainite crystal grain can know those definite Photomicrographs, rather than the photo of those tissues in the table 3.
In addition, according to observation to surperficial microstructure, in mould, do not pick out the composition difference in the tissue between the outside, the Hardness Distribution measurement shows that the inside and outside surface hardness value of mould is even substantially, find thus, in this mould, do not have existing generation decarburization phenomenon also not produce the carburizing phenomenon, and this is usually to produce in customary quenching method of refrigerative mould in oil after heating in a vacuum.
For reference, Fig. 8 is the opticmicroscope microstructure that the mould top layer decarburization state that quenches by conventional blasting method is shown.On the configuration surface partly of mould, observe the Decarburized layer of dark 0.15mm, and on the water-cooled slit surfaces, observe another Decarburized layer that becomes ferritic dark 0.01mm.
Then, will be assembled into practical device by the product mould injection molding tool of above-mentioned Q-tempering method acquisition and carry out the casting test of aluminium alloy.
As table 4 is concluded, in the mould of pressing comparative example 2 acquisitions, on the angle of mould, produce thermal crack, after 50000 apotypes are annotated when it uses without repairing, this crack growth becomes big crackle, and that mould of the present invention presents is more than the long twice of life span of mold of general method preparation.Its working life is not less than from beginning to cool down the stage and uses high pressure gas refrigerative mould.
Table 4
| Classification | Method of cooling (gaseous tension etc.) | Working life | The reason of scrapping (degree of depth 40mm) | |
| The present invention | ?1 | 2 crust-6 crust | ????129000 | Thermal crack |
| ?2 | 3 crust-8 crust | ????138000 | Thermal crack | |
| ?3 | 2 crust-8 crust | ????139000 | Thermal crack | |
| ?4 | 3 crust-6 crust | ????124000 | Thermal crack | |
| Comparative example | ?1 | 6 crust | ????128000 | Thermal crack |
| ?2 | 2 crust | ????51000 | Thermal crack-big crackle | |
The result is, die deformation of the present invention is little, also is a spot of bainite structure even have, long working life, and easy to use.Though a spot of bainite structure and long working life are arranged in the mould of comparative example 1, but it presents big distortion (shrinking and deflection), inconvenience is used, though and its distortion of the mould that obtains in comparative example 2 is little, have many bainite structures and short working life.
As can be known above-mentioned, the present invention is characterised in that following steps: in the quenching stage in vacuum oven heating mould, be higher than this mould of gas cooling of the speed of cooling that carbide or troostite separate out with speed of cooling, cool off this mould fast with pressurization gas then.
By implementing such quenching, just can obtain the mould that size distortion is low and amount of deflection is little and reduce separating out of bainite, just can obtain the intact mould of no decarburization in surface and carburizing thus, and its toughness is fabulous.
As a result, the initial stage that the present invention can be provided at use does not produce thermal crack or big crackle, and the mould with stable long service live is so be efficiently for industry.
Claims (6)
1. the degree of depth is greater than 40mm with stood the mould of vacuum hardening, it is characterized in that each lattice length with bainite structure of separating out the position in from the surface of vacuum hardening mould to the scope of degree of depth 40mm is not more than 20 μ m and width is not more than 2 μ m.
2. the mould of claim 1 is characterized in that the amount of deflection measured on the bottom surface of this vacuum hardening mould and shrinking percentage are not more than 0.2% and be not more than 0.15% respectively.
3. claim 1 or 2 mould is characterized in that keeping the surperficial position not decarburization or the not carburizing basically basically of this vacuum hardening mould on thermal treatment surface.
4. the method for a die quenching, the step that it comprises is: heat this mould in a vacuum, blowing cooling gas cools off this mould thus to this mould, it is characterized in that blowing the pressure that this cooling gas improves this cooling gas midway.
5. the method for the die quenching of claim 4, it is characterized in that cooling off this mould, and the refrigerative of secondary cooling gas before the bainite transformation of this mould begins that again pressure is higher than the supercharging of this cooling gas introduced this mould of cooling midway by in vacuum oven, introducing a cooling gas.
6. the method for the die quenching of claim 4, it is characterized in that by in vacuum oven, introducing the first cooling gas of 1-4 crust, mold cools down is dropped to 650-300 ℃ temperature with the speed of cooling faster than the critical cooling velocity of separating out carbide or troostite, introduce the secondary cooling gas of 4-10 crust then, separate out to prevent bainite.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP255511/1996 | 1996-09-05 | ||
| JP25551196A JP3159372B2 (en) | 1996-09-05 | 1996-09-05 | Mold and quenching method |
| JP255511/96 | 1996-09-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1186865A true CN1186865A (en) | 1998-07-08 |
| CN1055129C CN1055129C (en) | 2000-08-02 |
Family
ID=17279775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97118690A Expired - Lifetime CN1055129C (en) | 1996-09-05 | 1997-09-05 | Die and quenching method of the same |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3159372B2 (en) |
| CN (1) | CN1055129C (en) |
| TW (1) | TW470777B (en) |
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|---|---|---|---|---|
| CN103773936A (en) * | 2012-10-23 | 2014-05-07 | 日立金属株式会社 | Method for quenching die |
| CN103785734A (en) * | 2014-01-28 | 2014-05-14 | 无锡红弦汽车轻量化科技有限公司 | Pressure cooling process of segmented reinforcing type parts of hot forming steel pipe, and die hydraulic device |
| CN106929647A (en) * | 2017-04-25 | 2017-07-07 | 东莞市华兴隆模具钢材有限公司 | A kind of vacuum heat-treating method of mould steel |
| CN107922991A (en) * | 2015-09-30 | 2018-04-17 | 日立金属株式会社 | The Q-tempering method of the deriving method of cooling time when being quenched to steel, the process for quenching of steel and steel |
| CN108472719A (en) * | 2015-11-05 | 2018-08-31 | 联合工程公司 | Method for improving heat treating castings |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3897274B2 (en) * | 1999-12-28 | 2007-03-22 | 日立金属株式会社 | Hardening method for steel |
| JP5358875B2 (en) * | 2005-04-28 | 2013-12-04 | アイシン・エィ・ダブリュ株式会社 | Steel member cooling method |
| WO2006118242A1 (en) * | 2005-04-28 | 2006-11-09 | Aisin Aw Co., Ltd. | Steel member and process for heat treatment thereof |
| JP2007302946A (en) * | 2006-05-11 | 2007-11-22 | Daido Steel Co Ltd | Method for manufacturing alloy steel |
| JP6863141B2 (en) * | 2017-07-07 | 2021-04-21 | 日産自動車株式会社 | Quenching method and quenching equipment for steel parts |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2932357B2 (en) * | 1995-12-28 | 1999-08-09 | 日栄鋼材株式会社 | Quenching method of mold made of hot die steel |
-
1996
- 1996-09-05 JP JP25551196A patent/JP3159372B2/en not_active Expired - Lifetime
-
1997
- 1997-08-21 TW TW86112015A patent/TW470777B/en not_active IP Right Cessation
- 1997-09-05 CN CN97118690A patent/CN1055129C/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103773936A (en) * | 2012-10-23 | 2014-05-07 | 日立金属株式会社 | Method for quenching die |
| CN103773936B (en) * | 2012-10-23 | 2015-07-08 | 日立金属株式会社 | Method for quenching die |
| CN103785734A (en) * | 2014-01-28 | 2014-05-14 | 无锡红弦汽车轻量化科技有限公司 | Pressure cooling process of segmented reinforcing type parts of hot forming steel pipe, and die hydraulic device |
| CN103785734B (en) * | 2014-01-28 | 2016-05-11 | 无锡红弦汽车轻量化科技有限公司 | Pressure process for cooling and the mould hydraulic means of hot forming steel pipe segmentation strengthening class part |
| CN107922991A (en) * | 2015-09-30 | 2018-04-17 | 日立金属株式会社 | The Q-tempering method of the deriving method of cooling time when being quenched to steel, the process for quenching of steel and steel |
| CN108472719A (en) * | 2015-11-05 | 2018-08-31 | 联合工程公司 | Method for improving heat treating castings |
| CN106929647A (en) * | 2017-04-25 | 2017-07-07 | 东莞市华兴隆模具钢材有限公司 | A kind of vacuum heat-treating method of mould steel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1055129C (en) | 2000-08-02 |
| JP3159372B2 (en) | 2001-04-23 |
| TW470777B (en) | 2002-01-01 |
| JPH1080746A (en) | 1998-03-31 |
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