CN101397603A - Manufacturing method of metal mould - Google Patents
Manufacturing method of metal mould Download PDFInfo
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- CN101397603A CN101397603A CNA2008101617041A CN200810161704A CN101397603A CN 101397603 A CN101397603 A CN 101397603A CN A2008101617041 A CNA2008101617041 A CN A2008101617041A CN 200810161704 A CN200810161704 A CN 200810161704A CN 101397603 A CN101397603 A CN 101397603A
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Abstract
The present invention provides a method for preparing metal mold. The grains can be adjusted to uniform with a quenching procedure even the metal mold with complicated shape. The present invention provides a method for manufacturing the metal mold which executes quenching processing to the raw material of metal mold. The quenching procedure comprises the following steps: (a) a temperature raising step for heating the raw material of metal mold in a temperature area from an A1 phase transformation point to an A3 phase transformation point with a heating rate above 100 DEG C/h; (b) a step of holding the heated raw material of metal mold at a temperature area which is above the A3 phase transformation point and does not exceed 1150 DEG C; (c) a step of cooling the raw material of metal mold after holding of raised temperature in a temperature area from A3 phase transformation point to 600 DEG C with a cooling rate of 5-20 DEG C/min; (d) a step of halting the cooling of the raw material of metal mold for 0.5-5 hours in the temperature area from 500 DEG C to 400 DEG C; and (e) a step of cooling the raw material of metal mold in the low temperature side cooling which is halted with cooling in the temperature area from 400 DEG C to 200 DEG C with the cooling rate of 1-15 DEG C/min.
Description
Technical field
The present invention relates to the manufacture method of metal die, particularly relate to the manufacture method that has end strain and high tenacity concurrently and can make the metal die of crystal grain miniaturization.
Background technology
Metal die requires high rigidity and high tenacity.The very big influence of the quenching method of the characteristic heat-treated of high rigidity and high tenacity.
Add in quenching and to pine for,, select high quenching temperature in the scope that does not make thickization of crystal grain in order to make alloying element solid solution to greatest extent.In addition, in order to obtain high tenacity, need make the crystal grain miniaturization, simultaneously, in quench cooled, the inhibition carbide is separated out to crystal boundary, prevents bainite (bainite) phase transformation.At this moment, quench cooled needs chilling, and still, on the other hand, the strain of metal die during owing to chilling, distortion become big, therefore need suitably regulate speed of cooling.Therefore, various motions are always arranged.
Method as the metal die that is used to obtain to require low strain and high tenacity to exist side by side always proposes to have various motions.Always the method major part of Ti Chuing is to adjust the cooling conditions of quenching temperature, to reach the method that low strain, high tenacity are existed side by side.
For example, proposing in JP-A-2006-342377 recently has a kind of Ma Shi to hang down isothermal quenching (marquenching) method, it is that cooling is continuously implemented in the heating of quenching temperature, making the speed of cooling of cooling off slow component is more than 20～5 ℃/minute from the high-temperature area of quenching temperature to 600 ℃, 400 ℃ to 200 ℃ low-temperature region is 1～15 ℃/minute, avoid quenching crack thus, thereby can access the metal die of low strain and high tenacity.
Ma Shi hangs down isothermal quenching (marquenching) method, it is a kind of quenching crack in order to prevent to cause because of chilling, and the cooling during with quench cooled is carried out isothermal on the top of martensite (martensite) phase transformation or under the higher temperature and is kept, and carries out refrigerative again and handle after the temperature homogenization that makes each several part.
The disclosed method of above-mentioned JP-A-2006-342377 also is general martempering (marquenching) method, is the quenching method of the metal die that becomes of the low temperature that obtained by martempering (marquenching) method.
Summary of the invention
The present inventor also utilizes martempering method (marquenching), low strain of research and the quenching method of leading the metal die of existing side by side with toughness.Its result can realize existing side by side of low strain and high tenacity by certain application martempering method (marquenching) as can be known.Yet, in complex-shaped metal die, find, only adjust speed of cooling, for example fluctuation that still can have crystal grain at the near surface and the central part of metal die, the consequent is that toughness also exists fluctuation.
The objective of the invention is to, a kind of manufacture method of metal die is provided, even complex-shaped metal die is used quenching process and also can be adjusted into uniform crystal grain.
As both obtaining excellent toughness, suppress a method of its fluctuation again, the present inventor has studied various heat-treat conditions for the metal structure homogeneous that makes the metal die with complicated shape.Its result points out, when metal die is quenched, is not only cooling conditions, and the condition during heating is also very important, thereby reaches the present invention.
So, according to the present invention, provide a kind of following metal die manufacture method of the former material of metal die being implemented quenching heat treatment.
In the manufacture method of the metal die of former material enforcement quenching heat treatment to metal die, described quench treatment comprises following steps:
(a) in temperature province from the A1 transformation temperature to the A3 transformation temperature, the heating step that the former material of described metal die is heated with the rate of heating more than 100 ℃/hour;
(b) more than the A3 transformation temperature, be no more than 1150 ℃ temperature province, keep the step of the former material of heated described metal die;
(c) in temperature province from A3 transformation temperature to 600 ℃, with 5～20 ℃/minute speed of cooling, the step of the metal die former material of cooling after described intensification degree keeps;
(d) from 500 ℃ to 400 ℃ temperature province, interrupt the refrigerative step of 0.5～5 hour former material of described metal die;
In the low temperature side cooling process of (e) in described cooling, having no progeny,,, carry out the refrigerative step of the former material of described metal die with 1～15 ℃/minute speed of cooling from 400 ℃ to 200 ℃ temperature province.
According to the manufacture method of metal die of the present invention, even improve quenching temperature, crystal grain still is maintained under the fine state, therefore can access high tenacity, the big crackle in the time of can preventing that metal die applied big load.In addition, because can also improve quenching temperature, so its hardness, hard main worker is also high for high temperature, and is effective to the inhibition of thermal crack (thermal crack) etc.Because the thermal treatment strained reduces, also play the effect that reduces the manual man-hour after the thermal treatment in addition.
Description of drawings
Fig. 1 is the heating curve figure (heat pattern) of an example of expression quenching method of the present invention.
Fig. 2 is the heating curve figure (heat pattern) of an example of expression quenching method of the present invention.
Fig. 3 is a section microphotograph of using the test portion of quenching method of the present invention.
Fig. 4 is the section microphotograph of comparative example test portion.
Nomenclature
1. preheating procedure
1A. constant temperature keeps operation
2. heating process
3. quench and keep operation
4. quench cooled operation
5. interrupt keeping operation
6. low temperature side quench cooled operation
Embodiment
As above-mentioned, important being characterised in that of the present invention in the manufacture method of metal die, is suitable for and makes the optimized quenching conditions of the speed that is warming up to quenching temperature.The present invention below is described.
In quenching conditions of the present invention, quenching heating step (Fig. 1 (2), Fig. 2 (2)) is with the rate of heating more than 100 ℃/hour heating A1 transformation temperature the reasons are as follows to the temperature field of A3 transformation temperature.
In the present invention, be heated to the condition particularly important of quenching temperature.In order to make the crystal grain miniaturization, suppress the deviation of grain size, need control the generation and the growth of the austenite (austenite) that generates because of phase transformation in the A1 transformation temperature to the temperature field of A3 transformation temperature.
As condition for this reason, need be with the temperature field of the heating of the rate of heating more than 100 ℃/hour A1 transformation temperature to the A3 transformation temperature.This be because, when ferrite (ferrite) generates the crystal grain of new austenite (austenite), if rate of heating is fast, then under the effect of crossing thermal effect from equilibrium temperature, cause the karyogenesis density height of austenite (austenite), thereby can access the effect of crystal grain miniaturization.
When the rate of heating of quenching heating step of the present invention is lower than 100 ℃/hour, and or if between A1 transformation temperature and A3 transformation temperature, carry out the preheating maintenance, then the nuclear of the generation of austenite (austenite) is few, crystal grain-growth one by one gets very big, austenite (austenite) phase transformation finishes back crystal grain and becomes thick, and the fluctuation of crystal grain diameter takes place easily.Therefore in the present invention, be with the temperature field of the heating of the rate of heating more than 100 ℃/hour A1 transformation temperature to the A3 transformation temperature.Though the shape and the weight of the former material of also interdependent metal die also can heat up with the rate of heating more than 150 ℃/hour, this can improve productivity.In addition, more preferably crystal grain is fine.
Also have, the upper limit of rate of heating can change according to the performance of process furnace and the weight and the shape of metal die raw material, therefore cannot treat different things as the same, but if excessively improve rate of heating, then because the heating inequality of the former material of metal die, cause easily taking place strain, so on the experience, be the upper limit of rate of heating with 400 ℃.Be limited to 300 ℃/hour on preferred, be limited to 280 ℃/hour on preferred, further preferably having gone up is 250 ℃/hour.
As in the present invention above-mentioned, the condition that is heated to quenching temperature is very important.
As the preferred condition that is heated to quenching temperature of the present invention more preferably, the intensification condition of the preheating procedure that carries out before above-mentioned quenching heating step (Fig. 1 (1), Fig. 2 (1)) is adjusted.
The condition of preheating procedure can be the heat-up rate below 150 ℃/hour.This be because, if surpass 150 ℃/hour heat-up rate, then the former material of metal die can produce strain, it is big that the skin section of the former material of metal die and temperature inside difference become, the possibility that the fluctuation of the crystal grain of corresponding site takes place uprises.
The heat-up rate of preferred preheating procedure is 50～150 ℃/hour a scope.Preferred heat-up rate is 75 ℃ ± 25 ℃/hour a scope, and further preferred heat-up rate is 75 ℃ ± 15 ℃/hour a scope.
In addition in the present invention, at above-mentioned quenching heating step (Fig. 1 (2), Fig. 2 (2)) before, the constant temperature that also can carry out the former material of metal die more than at least 1 time keeps (Fig. 2 (1A)).
Keep (Fig. 2 (1A)) by described constant temperature, the temperature inequality during the former material of heating of metal mould is alleviated, and therefore distortion reduces.The effect that also has in addition is, when metal die is made, because the also preheating of processing residual stress that takes place when utilizing the imitative type pattern of mechanical workout, thereby stress is removed, during through thereafter heating and by transformation temperature, be that the unusual growth of the crystal grain of motivating force also is inhibited with the residual stress.
In order more positively to obtain this effect, preferably carry out described constant temperature to the following 200 ℃ temperature range of A1 transformation temperature and keep for following 15 ℃ from the A1 transformation temperature.More become to elect as the A1 transformation temperature following 20 ℃ to the following 70 ℃ temperature range of A1 transformation temperature.
Also have, described thermostatic hold-time as above-mentioned, is that the temperature when alleviating the former material of heating of metal mould is not purpose, if therefore the time too short, then be difficult to obtain the effect that the temperature inequality is alleviated.Therefore, preferably have adequate time in order to alleviate the temperature inequality.But, because can change to some extent according to the weight and the shape of the former material of metal die, thus cannot treat different things as the same, but on experience, preferably carry out the maintenance about 0.5～5 hour.If carry out the maintenance more than 0.75 hour, with making skin temperature and temperature inside difference in 30 ℃.Therefore, be more than 0.75 hour (45 minutes) as the preferred hold-time.
Also have, during practical application the inventive method, preferably select following method from productive viewpoint: for example, the former material of metal die of in the process furnace that is preheated to about 400～500 ℃, packing into and quenching, carry out constant temperature and be retained to the temperature of preheating oven, poor with the surface and the temperature inside that alleviate metal die.Carrying out this low temperature when keeping, also preferably under the above-mentioned A1 transformation temperature 15 ℃ to the A1 transformation temperature 200 ℃ temperature range carry out described constant temperature and keep.
Secondly, (Fig. 1 (3), Fig. 2 (3)) describes for the maintenance operation under the quenching temperature.
The temperature of the maintenance operation under the quenching temperature of the present invention, be set in the A3 transformation temperature above, upward surpass 1150 ℃ temperature field.
Its reason is, if quenching temperature keeps temperature to be lower than the A3 transformation temperature, then the solid solution of carbide and alloying element is insufficient, causes hardness low, and hot strength is also low in addition, and thermal crack (thermal crack) therefore takes place easily.In addition, if quenching temperature is the temperature above 1150 ℃, the then also solid solution of carbide of pinning (pinning) crystal grain, crystal grain is grown up unusually.
In order to suppress the generation of these problems, reach the miniaturization of crystal grain, need be the temperature range of A3 transformation temperature～1150 ℃.Be preferably 1010～1050 ℃.
Secondly, say so bright for quench cooled operation of the present invention.
In the present invention, after the maintenance operation under the quenching temperature,, cool off with the temperature field of 5～20 ℃/minute speed of cooling to A3 transformation temperature to 600 ℃ as the quench cooled operation.(Fig. 1 (4), Fig. 2 (4))
If this temperature field speed of cooling is slack-off, then crystal boundary has carbide to separate out, and easily causes intercrystalline failure, toughness and anticorrosion stress-resistant crackle step-down.For it being prevented the speed of cooling of subsistence level more than 5 ℃/minute.If surpass 20 ℃/minute, then the cooling fluctuation becomes big, and the skin section of metal die and temperature inside are uneven to be enlarged, and the thermal stresses difference during because of cooling causes strain and distortion to become big.
Therefore, former state is kept to keep operation operation effect that adjust, that make the crystal grain homogenization before, the strain of the thermal stresses difference when cooling off to relax, also can prevent distortion, as such cooling conditions, be defined as speed of cooling, the temperature field of A3 transformation temperature to 600 ℃ is cooled off with 5～20 ℃/minute.Be preferably 10～15 ℃/minute cooling conditions.
Next in the present invention, through interrupting keeping operation.(Fig. 1 (5), Fig. 2 (5))
Interrupt keeping its purpose of operation to be, substantially carry out isothermal by the thermal stresses that the stage of quench cooled operation is taken place and keep, the temperature inequality is disappeared, to reduce inside and outside temperature head.
Why making the temperature of interrupting the maintenance operation is 500～400 ℃, is because this temperature field is the metastable zone of austenite (austenite).If keep with the temperature than 500 ℃ high, then the situation of perlite (pearlite) phase transformation on the other hand, if lower than 400 ℃, then begins bainite (bainite) phase transformation.Therefore, keep the temperature limit of operation to fix on 500～400 ℃ scope interruption of the present invention.Be preferably 425～475 ℃ temperature field.
For the effect of the temperature homogenization that obtains the former material of metal die, this interrupts keeping the time subsistence level 0.5 hour of operation.Though the time is long more favourable more to the temperature homogenization, keep more than 5 hours, therefore the effect of the temperature homogenization state that reaches capacity is then considered practical productivity and is made and be limited to 5 hours.If keep more than 0.75 hour, then can make skin temperature and temperature inside difference is in 30 ℃, therefore preferred the maintenance more than 0.75 hour (45 minutes).
Secondly, carry out low temperature side quench cooled operation, it is the temperature field that keeps maintenance temperature to 400～200 ℃ of operation with 1～15 ℃/minute speed of cooling cooling from aforementioned interruption.(Fig. 1 (6), Fig. 2 (6))
The speed of cooling of this low temperature side quench cooled operation is the generation that suppresses the bainite (bainite) of the former material of metal die in the cooling, suppresses the temperature inequality that causes because of chilling, control toughness and quenching strain, the needed speed of cooling of crackle in addition.
When 1 ℃/minute that is lower than speed of cooling, bainite (bainite) is a large amount of to be generated, and toughness reduces.If surpass 15 ℃/minute, then the temperature of articles difference in martensite (martensite) phase transformation becomes big, because the temperature inequality in the cooling causes strain to become big easily, it is big that the danger of quenching crack also becomes.
Preferred speed of cooling is 10～15 ℃/min.
More than, if use illustrated quenching method of the present invention, even then complex-shaped metal die still also can be adjusted to the crystal grain of homogeneous.
This method is, for example, in order to be adjusted to the condition of above-mentioned quench cooled operation, the maximum surface temperature of the former material of metal die will reach below 600 ℃, after having carried out cooling equably by the air blast cooling of using gas blower (fan), remain on be maintained in advance 500～400 ℃ process furnace in, interrupt cooling quickly and interrupt keeping operation, after keeping the specified time, begin to cool down once more, drop into quenching oil and carry out the method for chilling.In addition, except that gas blower (fan) and quenching oil,, also can make the cooling of the rare gas element forced convection of pressurization in the warm side quench cooled operation.
[embodiment]
Illustrate in greater detail the present invention by following embodiment.
At first, prepare the test portion of simulation metal die, use the metal die material from the hot-forging die (die) of the composition shown in the table 1, following steel of 300mm (w) * 300 (1) * 300 (t) thickness of cutting respectively, its 1 with forge draw direction abreast mechanical workout go out wide 50mm, the groove of 50mm deeply.
The No.A alloy is equivalent to JIS SKD61 material, and the No.2 alloy adds Co, Ni in SKD61, has also improved Mo, is the alloy that heat-resisting crackle (thermal crack) characteristic has been improved.
It is 850 ℃ that the A1 of No.A alloy puts change mutually, and the A3 transformation temperature is 895 ℃, and the A1 transformation temperature of No.B alloy is 830 ℃, and the A3 transformation temperature is 850 ℃.
[table 1]
| No. | C | Si | Mn | Cr | Co | Ni | Mo | V | Surplus |
| A | 0.37 | 0.92 | 0.41 | 5.12 | - | - | 1.35 | 0.94 | Iron and unavoidable impurities |
| B | 0.38 | 0.19 | 0.58 | 5.15 | 0.57 | 0.53 | 2.17 | 0.79 | Iron and unavoidable impurities |
Use vacuum oven that these block test portions are carried out quench treatment respectively.
In order to measure speed of cooling, insert thermoelectricity at central part and measure occasionally.The temperature on surface is confirmed by the radiation thermometer.Quenching conditions is presented in the table 2.Also have, low temperature side quenching heating process (Fig. 1 (1), Fig. 2 (the 1)) condition that does not show in the table 2 is 75 ℃/H.
The test film of No.6 in the table 2, in a vacuum or be heated to quenching temperature in the inert gas atmosphere, then limit pilot-gas amount of pressurization in inert gas atmosphere, the limit carries out the quench cooled operation, interrupt keeping the low temperature side quench cooled operation after the operation.
The cooling conditions of other test film is, as the quench cooled operation, in a single day take out material from process furnace, in atmosphere, carry out air cooling or air blast cooling, interrupt and pack into being set in the process furnace of specified temperature on the cooling way, through after heating the interruption operation of maintenance, cool off with quenching oil, it is a low temperature side quench cooled operation.
The heating curve figure of each test film (heat pattern), No.7 test film are heating curve figure (heat pattern) shown in Figure 1, are heating curve figure (heat pattern) shown in Figure 2 beyond it.
Low temperature side quench cooled operation is tempered to 45HRC after finishing, and the mensuration, pendulum (Charpy) impact value that have or not quenching crack, dependent variable are estimated.
Having or not of quenching crack is that angle (corner) in that the groove that has carried out dye check (color check) adds the Ministry of worker confirms whether crackle is arranged.The mensuration of dependent variable is to measure with groove to add the reference plane pairing deflection of the Ministry of worker for the face of opposition side on diagonal lines.Among the measured value, the amount that breaks away from the reference plane maximum is represented by percentage (%) divided by 300.It is to be parallel to the forging direction from central division to cut that pendulum impacts (Charpy) test film, carries out 2mmU otch (notch) test.
In addition, by the synthetic determination in 10 visuals field, confirm whether crystal grain diameter fluctuates.The result that ripple disable (have or not mix grain tissue) arranged is presented in the table 3 with the result of the having or not of above-mentioned quenching crack, dependent variable, grain size number, pendulum (Charpy) impact value, representational microphotograph is presented at Fig. 3 (No.7 of the present invention), among Fig. 4 (comparative example No.1).
[table 2]
| No. | Material | (constant temperature maintenance operation) | (heating process) A1～A3 rate of heating ℃/hour | (maintenance operation) quenching temperature ℃ | (quench cooled operation) A3～600 ℃ ℃ of/minute | (interrupting keeping operation) | (low temperature side quench cooled operation) 400～200 ℃ ℃/minute | Reference |
| 1 | A | 750 ℃ * 1 hour | 75 | 1030 | 15 | 500 ℃ * 40 minutes | 4 | Comparative example |
| 2 | A | 750 ℃ * 1 hour | 200 | 1030 | 8 | 500 ℃ * 40 minutes | 11 | The present invention |
| 3 | A | 700 ℃ * 1 hour | 250 | 1040 | 10 | 470 ℃ * 60 minutes | 14 | The present invention |
| 4 | A | 500 ℃ * 1 hour 800 ℃ * 4 hours | 250 | 1040 | 15 | 450 ℃ * 60 minutes | 15 | The present invention |
| 5 | A | 750 ℃ * 1 hour | 200 | 1030 | 7 | 400 ℃ * 300 minutes | 12 | The present invention |
| 6 | A | 800 ℃ * 1 hour | 175 | 1020 | 12 | 400 ℃ * 60 minutes | 10 | The present invention |
| 7 | A | Do not have | 225 | 1040 | 8 | 475 ℃ * 60 minutes | 12 | The present invention |
| 8 | B | 750 ℃ * 1 hour | 120 | 1030 | 7 | Do not have | 12 | Comparative example |
| 9 | B | 750 ℃ * 1 hour | 200 | 1030 | 14 | Do not have | 5 | Comparative example |
| 10 | B | 750 ℃ * 1 hour | 200 | 1040 | 12 | 400 ℃ * 40 minutes | 5 | The present invention |
| 11 | B | 7D0 ℃ * 1 hour | 170 | 1030 | 15 | 450 ℃ * 240 minutes | 13 | The present invention |
| 12 | B | 500 ℃ * 1 hour 750 ℃ * 6 hours | 240 | 1040 | 18 | 450 ℃ * 60 minutes | 7 | The present invention |
| 13 | B | 700 ℃ * 1 hour | 200 | 1040 | 16 | 400 ℃ * 60 minutes | 3 | The present invention |
| 14 | B | 500 ℃ * 1 hour 750 ℃ * 4 hours | 150 | 1030 | 10 | 425 ℃ * 40 minutes | 9 | The present invention |
[table 3]
| No | Have or not quenching crack | Dependent variable % | The grain size number numbering | Have or not and mix the grain tissue | Pendulum impact value J/cm 2 | Reference |
| 1 | Do not have | 0.01 | 4 | Have | 15 | Comparative example |
| 2 | Do not have | 0.02 | 7 | Do not have | 40 | The present invention |
| 3 | Do not have | 0.02 | 7 | Do not have | 37 | The |
| 4 | Do not have | 0.01 | 7 | Do not have | 42 | The |
| 5 | Do not have | 001 | 7 | Do not have | 39 | The |
| 6 | Do not have | 0.02 | 7 | Do not have | 40 | The present invention |
| 7 | Do not have | 0.02 | 8 | Do not have | 42 | The present invention |
| 8 | Have | 0.05 | 6 | Have | 41 | Comparative example |
| 9 | Have | 0.08 | 8 | Have | 53 | Comparative example |
| 10 | Do not have | 0.01 | 7 | Do not have | 48 | The present invention |
| 11 | Do not have | 0.01 | 8 | Do not have | 52 | The present invention |
| 12 | Do not have | 0.01 | 8 | Do not have | 53 | The present invention |
| 13 | Do not have | 0.02 | 7 | Do not have | 45 | The present invention |
| 14 | Do not have | 0.01 | 8 | Do not have | 49 | The present invention |
Simulation application the test portion of metal die of the inventive method, fluctuation (mixing the grain tissue), quenching crack all do not have, dependent variable, grain size number, pendulum (Charpy) impact value all are good result.In addition, watch the microphotograph of Fig. 3 and Fig. 4, No.7 of the present invention still is the metal structure of homogeneous until central part, but its crystal grain confusion of comparative example No.1, bainite (bainite) tissue is also flourishing.
Comparative example No.1 is because slow from the rate of heating of A1 to A3, so austenite (austenite) grain is fully grown up, crystal grain is thick, and pendulum (Charpy) impact value is low and be lower than 20J/cm
2In addition, comparative example No.8 and No.9 are because implementing to quench interrupts maintenance, so do not have equal thermal process in the cooling way, it is big that inhomogeneous cooling becomes, at the stress concentration portion generation crackle of slot part angle (corner).
[utilizing on the industry possibility]
Used the metal die of process for quenching of the present invention, crystal grain is fine, can obtain high tenacity, the huge crackle in the time of can preventing that metal die applied large load.
In addition because hardening heat also increases, so hardness, high temperature hardness are also high, in the inhibition of fire check (thermal crack) etc. effectively. Can be applicable to the indispensable purposes of high tenacity and elevated temperature strength. In addition in practical, because the reduction of heat treatment strain, effect is also gathered in the reduction in the manual man-hour after the heat treatment.
Therefore, can be applicable to metal die so complicated shape need, and in large-scale steel, the steel of this purposes of homogenization requirement be arranged.
Claims (4)
1. the manufacture method of a metal die wherein, is carried out quenching heat treatment to the former material of metal die, and described quenching heat treatment comprises the steps:
(a) in temperature province from the A1 transformation temperature to the A3 transformation temperature, the heating step that the former material of described metal die is heated with the rate of heating more than 100 ℃/hour;
(b) more than the A3 transformation temperature and be no more than 1150 ℃ temperature province, keep the step of the former material of heated described metal die;
(c) in temperature province from A3 transformation temperature to 600 ℃, with 5～20 ℃/minute speed of cooling, the step of the metal die former material of cooling after described intensification degree keeps;
(d) from 500 ℃ to 400 ℃ temperature province, interrupt the refrigerative step of 0.5～5 hour former material of described metal die;
In the low temperature side cooling process of (e) in described cooling, having no progeny,,, carry out the refrigerative step of the former material of described metal die with 1～15 ℃/minute speed of cooling from 400 ℃ to 200 ℃ temperature province.
2. the manufacture method of metal die according to claim 1, wherein, the rate of heating in the described heating step (a) is the heating more than 100 ℃/hour, carries out with the rate of heating more than 150 ℃/hour.
3. the manufacture method of metal die according to claim 1 and 2, wherein, rate of heating in carrying out described heating step (a) is before the heating more than 100 ℃/hour, as preheating procedure, carries out the heating of the former material of described metal die with the rate of heating below 150 ℃/hour.
4. according to the manufacture method of each described metal die in the claim 1～3, wherein, rate of heating in carrying out described heating step (a) is before the heating more than 100 ℃/hour, and the constant temperature that carries out at least once above former material of described metal die keeps.
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| JP2007246693 | 2007-09-25 | ||
| JP2007-246693 | 2007-09-25 | ||
| JP2007246693A JP5105235B2 (en) | 2007-09-25 | 2007-09-25 | Mold quenching method |
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| CN101397603A true CN101397603A (en) | 2009-04-01 |
| CN101397603B CN101397603B (en) | 2010-10-27 |
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| CN103228802B (en) * | 2010-12-29 | 2014-10-08 | 日立金属株式会社 | Method for quenching mold |
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| JPS59173239A (en) * | 1984-03-05 | 1984-10-01 | Kubota Ltd | Spheroidal graphite cast iron caliber roll |
| JPH06104851B2 (en) * | 1989-06-26 | 1994-12-21 | 日栄鋼材株式会社 | Hardening method for molds made of hot die steel |
| JPH06234085A (en) * | 1993-02-08 | 1994-08-23 | Nippon North Kk | Production of composite tool |
| JPH08232057A (en) * | 1995-02-27 | 1996-09-10 | Kobe Steel Ltd | Production of die cast member |
| JP5023441B2 (en) * | 2005-06-07 | 2012-09-12 | 大同特殊鋼株式会社 | Heat treatment method for steel members for die casting dies |
| JP2006342377A (en) * | 2005-06-07 | 2006-12-21 | Daido Steel Co Ltd | Method for quenching large-sized die |
| JP2009013465A (en) * | 2007-07-04 | 2009-01-22 | Daido Steel Co Ltd | Tool steel, member for forming using the same, and method for verifying quality of tool steel |
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2007
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Cited By (6)
| 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 |
| CN104928443A (en) * | 2014-03-18 | 2015-09-23 | 日立金属株式会社 | Quenching method of die and manufacture method of die |
| CN104928443B (en) * | 2014-03-18 | 2017-05-10 | 日立金属株式会社 | Quenching method of die and manufacture method of die |
| 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 |
| CN106119475A (en) * | 2016-08-30 | 2016-11-16 | 芜湖三联锻造有限公司 | A kind of large-scale high alloy mould special thermal treatment technique |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5105235B2 (en) | 2012-12-26 |
| JP2009074155A (en) | 2009-04-09 |
| CN101397603B (en) | 2010-10-27 |
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