CN108425001A - Method for the steel plate member for manufacturing hot forming and press quenching - Google Patents
Method for the steel plate member for manufacturing hot forming and press quenching Download PDFInfo
- Publication number
- CN108425001A CN108425001A CN201810140264.5A CN201810140264A CN108425001A CN 108425001 A CN108425001 A CN 108425001A CN 201810140264 A CN201810140264 A CN 201810140264A CN 108425001 A CN108425001 A CN 108425001A
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- CN
- China
- Prior art keywords
- temperature
- steel plate
- plate member
- cooling
- taking
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
- B21D22/022—Stamping using rigid devices or tools by heating the blank or stamping associated with heat treatment
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Abstract
The present invention relates to a kind of methods for manufacturing the steel plate member of hot forming and press quenching, the steel plate member is more than 1500MPa by having, the hardenable steel making of the tensile strength of preferably greater than 1650MPa to 2250MPa, sheet metal is heat-treated in beyond the heat treatment step on the specific austenitizing temperature Ac3 of material with the method, in subsequent merging step, sheet metal with merging temperature is presented in forming tool, in press quenching step, make the steel plate member hot forming, and at the same time steel plate member is made to be cooled to taking-out temperature, and in taking out step, steel plate member with taking-out temperature is taken out from open forming tool.
Description
Technical field
The present invention relates to a kind of according to the as described in the preamble for manufacturing hot forming and press quenching of claim 1
The method of steel plate member.Steel plate member is by with the tensile strength Rm more than 1500MPa, especially greater than 1650MPa to 2250MPa
Hardenable steel making.
Background technology
Hot forming steel, such as 22MnB5 have martensitic structure almost, nominal tension after heat forming processes
Intensity is 1500MPa.The ductility of this tissue is usually characterized with elongation at break.The elongation at break of 22MnB5 is in about
Between 4% to 6%.In addition, according to the bending angle in the so-called wafer warpage experiment of VDA 238-100 as characterization ductility
Other characteristic value be presented.Such as 22MnB5, bending angle is it is contemplated that between 50 ° to 65 °.Currently, these
The intensity of hot forming steel is for example further improved by improving carbon content to 2000MPa.However, hot forming steel plate intensity more
It is more and more sensitive, that is more and more crisp to the reaction of load when high.Therefore, the thin steel of 1500MPa is more than for intensity Rm
Plate material (plate thickness e.g., about 1.5mm), it is often necessary to time-consuming temper is carried out afterwards, to reduce brittleness.However,
This additional temper increases the process lasting time during hot forming, and results in the need for using for implementing tempering
The auxiliary tools of processing.
Such as this steel plate for manufacturing hot forming and press quenching as known to 10 2,013 010 946 B3 of document DE
The method of component.In the heat treatment step, heat is carried out to the steel plate member on beyond the specific austenitizing temperature of material
Processing.Merging step then is carried out, in this step, the sheet metal with the merging temperature for being about as much as austenitizing temperature
It is presented in hot forming instrument.In next press quenching step, makes sheet metal hot forming, taken and at the same time being cooled to
Go out temperature.In 10 2,013 010 946 B3 of document DE, cooling procedure is when higher than so-called martensite transfor mation finishing temperature
It is interrupted, so-called martensite transfor mation finishing temperature is the temperature that the transformation from austenite to martensite largely terminates, to residual
The sub-fraction of remaining austenite is retained in institutional framework.Then in taking out step, by steel plate member from open forming work
It takes out in tool, is more specifically taken out under the taking-out temperature higher than martensite transfor mation finishing temperature, and be transferred to heating dress
It sets, wherein avoid steel plate member and be cooled to temperature less than 200 DEG C.Retained austenite can be steady particularly well as a result,
It is fixed.Temper is carried out in the heating device, in temper, the austenite in steel plate member is stablized, and
Steel plate member is also retained in the institutional framework of steel plate member after being cooled further to room temperature.Retained austenite reduces needle-shaped horse
Stress between family name's body, and realize, institutional framework is higher in intensity while having notable relative to martensite
The elongation at break of raising ductility in other words.
Invention content
Technical problem to be solved by the present invention lies in provide a kind of steel plate structure for manufacturing hot forming and press quenching
The method of part, wherein improve prolonging for the steel plate member in the case where steel plate member has the higher intensity Rm more than 1500MPa
More specifically malleability improves steel compared with the aforementioned prior art in the case where reducing the process time and reducing tool use
The ductility of board member.
The technical problem is solved by the technical characteristic of claim 1.The preferred improvement project of the present invention is in subordinate
It is disclosed in claim.
Characteristic according to claim 1, in press quenching step, the steel plate structure in the case where forming tool is closed
Part is cooled to taking-out temperature, which is located adjacent to the temperature range of the specific martensite transfor mation finishing temperature Mf of material
It is interior, more precisely particular on +/- the 10% of martensite transfor mation finishing temperature Mf within the temperature range of.It is walked in press quenching
In terms of unfavorable steel plate member deformation after rapid, such temperature range is not critical.
0.2% extension limit or elastic limit may be about being more than 1100MPa, excellent the yield strength of steel plate member in other words
Select 1250MPa to 1950MPa.
Particularly preferably a kind of process control, in the process control, the taking-out temperature of steel plate member is inclined with a temperature
Shifting amount is less than the specific martensite transfor mation finishing temperature of material.Therefore, it in taking out step, takes out with less than martensite transfor mation
The steel plate member of the taking-out temperature of finishing temperature.Ensure by this method, when taking out steel plate member, martensite forms termination, from
And in further technological process, otherwise component is being further transformed to geneva no longer since internal stress deforms from austenite
Component can deform when body.
Pure martensitic structure structure in steel plate member leads to higher steel plate member intensity, however causes brittleness liter simultaneously
Height, to can only realize the micro-strain with usually less than 7% elongation at break according to carbon content.In contrast, such as
By being learnt in 10 2,013 010 946 B3 of document DE, if retaining a part in the martensitic structure structure of steel plate member
Retained austenite can then improve the elongation at break of steel plate member.This is real by the incomplete transformation of austenite to martensite
It is existing, to which retained austenite is retained in the steel plate member of completion.
According to the present invention, this incomplete transformation of austenite to martensite passes through cooling spy in press quenching step
Fixed variation in time is realized.Preferably, cooling variation in time follows cooling curve, in the cooling curve
In, steel plate member temperature is from the pent shut-in time point of forming tool with larger, especially greater than 27 DEG C/s the first cooling
Rate is reduced to transit time point, and in the cooling curve, in the further time change after transit time point, steel
Board member is further cooled by with the second transition cooling rate substantially reduced, until occurring with slope, that is having
The flat cooling straight line G of third cooling rate.Third cooling rate for example can be 15 DEG C/s to 3 DEG C/s.Here, organizing
It is preferably in terms of the composition of structure, steel plate member temperature is in transit time point (or starting point in cooling straight line G) with a temperature
It spends offset and is higher than martensite transfor mation finishing temperature, but be less than the specific Ms (martensite start) point of material, which turns
It is the temperature that austenite starts to martensite transfor mation to become start temperature.On the one hand, such cooling curve ensures that austenite is several
It is completely transformed into martensite.On the other hand, due to after transit time point cooling rate greatly reduce, realize slowly
It is cooling, the formation of retained austenite is promoted whereby.
It being preferably in the simple design aspect of the technology of above-mentioned cooling curve, forming tool has heating device,
Can be heated using the heating device or temperature adjustment towards steel plate member tool-face.In this case, in press quenching step
In, forming tool is especially heated to the tool temperature in 100 DEG C to 250 DEG C ranges, as a result, can be in press quenching step
Simply generate cooling curve.In the further technological process after being taken out from forming tool, cooling procedure can not interrupt
And be continued for, more precisely particularly preferably with the 4th cooling rate carry out, the 4th cooling rate be designed as with
Third cooling rate is consistent or is less than third cooling rate, is that is, for example, about 1 DEG C/s to 5 DEG C/s.Therefore, the described 4th
Cooling stage indicates the tempering of component, to further decrease brittleness.
In order to continue cooling procedure, steel plate member can be transferred in stacking station after press quenching step,
In the stacking station, air cooling is carried out by using surrounding air to continue cooling procedure.
The above method is particularly suitable for the sheet metal component with for example, 1.5mm plate thickness, which has
Mass percent is more than 0.25%, especially greater than 0.27% to 0.40% carbon content C.In addition, sheet metal can contain in this way
Alloying component, which contributes to stabilization of austenite and thus obtains other than martensite also containing remaining difficult to understand
The component institutional framework of family name's body.
Description of the drawings
Below in conjunction with description of the drawings the embodiment of the present invention.In the accompanying drawings：
Fig. 1 shows equipment schematic diagram, is illustrated by the equipment schematic diagram shown in Figure 2 for manufacturing hot forming and pressurization
The process of the steel plate member of hardening；
Fig. 2 shows the block diagrams of the process for manufacturing steel plate member；
Fig. 3 shows chart, and the figure shows steel plate member temperature exists when going out to be placed in forming tool and when subsequent press quenching
Temporal variation.
Specific implementation mode
Fig. 1 roughly shows the schematic diagram of equipment, is illustrated first by the equipment for manufacturing hot forming and press quenching
Steel plate member basic working procedure.The equipment is for example with continuous-type furnace 1, for steel plate member hot forming and press quenching
Forming tool 3 and store steel plate member stacking station 5.First, the sheet metal 6 made of hardenable steel is transferred to continuously
It is heated above in formula heating furnace 1 and there the specific austenitizing temperature Ac3 of material of used steel, the austenitizing
Temperature Ac3 for example can be 930 DEG C.Sheet metal 6 so after heating is transferred in the condition of high temperature in forming tool 3, and
And there, hot forming forms steel plate member 7 and at the same time quenching in press quenching step.The high steel plate during hot forming
Member temperature ensures excellent deformation performance.In Fig. 1, forming tool 3 also has the heating unit 9 only shown, heating single
The mode of action of member 9 can be explained below.
The temperature-time diagram for being then act through Fig. 3 is described in detail in during being placed in step, press quenching step and taking-up step
Technological process, the change of steel plate member temperature and forming tool temperature in time is shown in solid in the temperature-time diagram
Change.In addition, the opening state and closed state of forming tool 3 are indicated by dotted lines.Therefore, forming tool 3 closes rank in tool
Section Δ tzuIn be closed, which for example can be 2s to 5s, and in press quenching step, forming tool 3
Stage Δ t is kept in toolHIn remain turned-off.In figure 3, which keeps stage Δ tHE.g. about 8s.It is alternative to this
Ground, the tool keep stage Δ tHSuch as can be about 15s.The tool keeps stage Δ tHCan usually have arbitrary continue
It time and especially may be in the range of 2s to 30s.Then, forming tool 3 is in tool open stage Δ taufIt is middle to be beaten
It opens, tool open stage Δ taufCan be 2s to 5s.
With reference to Fig. 3, by sheet metal 6 in merging time point t after being heat-treated in heating furnace 11And merging temperature(
It is about 930 DEG C in this example) it is placed in the forming tool 3 opened.Then carry out tool dwell period Δ tzu, tool closing rank
Section Δ tzuPoint t between when closed2Terminate at place.In further technological process, stage Δ t is kept in toolhIn pressurize
Cure step, that is adjoint while cooling hot forming.After completing press quenching step, forming tool 3 is beaten in tool
Open stage Δ taufIn be opened, and in take-off time point t4Steel plate member 7 is taken out and transfers them to stacking station 5.
In hot forming, the above process is common way.Core of the invention is, design as described below steel plate member cooling
Temporal variation, steel plate member cooling are be overlapped in time with forming process：
Press quenching step is so designed in figure 3 so that cooling variation in time follows cooling curve, at this
In cooling curve, steel plate member temperature is from shut-in time point t2To be more than the great first cooling rate a of 27 DEG C/s1It reduces straight
To transit time point t3.In transit time point t3In further time change later, with the second cooling rate a greatly reduced2
Continue cooling until occurring that there is third cooling rate a3Flat cooling straight line G.Third cooling rate a3Such as it is especially less than
15 DEG C/s to 3 DEG C/s.As from the figure 3, it may be seen that starting point of the steel plate member temperature in cooling straight line G is also higher than Mf temperature.Cooling straight line G
With Mf temperature in time point t5Intersection, that is steel plate member temperature is brought down below Mf temperature.The steel plate member temperature exists
Transit time point t3Also with temperature offset amountHigher than martensite transfor mation finishing temperature Mf, the steel plate member temperature is according to flat
Cooling straight line G be slowly decreased to taking-out temperatureThe taking-out temperatureWith temperature offset amountLess than martensite transfor mation
Finishing temperature Mf, martensite transfor mation finishing temperature Mf are about 300 DEG C in figure 3.
In technology cooling song shown in Fig. 3 is obtained simply by adjusting accordingly the temperature of forming tool 3
Line.For this purpose, in press quenching step, heating unit 9 is preferably heated to the tool temperature within the scope of 100 DEG C to 250 DEG CBy this method, on the one hand the above-mentioned of cooling curve starting point is also ensured that despite the presence of heated forming tool 3
Great first cooling rate a1, more specifically in tool temperatureIt raises simultaneously for example up to 600 DEG C (on the surface)
In the case of.On the other hand, pass through the temperature of adjusting forming tool 3, it is ensured that in transit time point t3Postcooling rate slows down significantly.
It is emphasized that in figure 3, steel plate member temperatureIn transit time point t3Higher than martensite transfor mation finishing temperature Mf, and
Transit time point t3Stage Δ t is kept in toolHIt is interior.
In the further technological process after suppressing cure step, steel plate member 7 is transferred in stacking station 5.At this
Stacking station 5, cooling procedure are not interrupted and are continued for, more specifically with the 4th cooling rate a4It carries out, the 4th cooling
Rate can be about 1 DEG C/s to 5 DEG C/s.This carries out air cooling to realize preferably by surrounding air.
Reference numerals list
1 continuous-type furnace
3 forming tools
5 stacking station
6 sheet metals
7 steel plate members
9 heating units
t1It is placed in time point
t2Shut-in time point
t3Transit time point
t4Take-off time point
t5Steel plate member temperature is brought down below the time point of Mf temperature
a1,a2,a3,a4Cooling rate
It is placed in temperature
Closing temperature
Transition temperature
Taking-out temperature
ΔtzuTool dwell period
ΔtHTool is kept for the stage
ΔtaufThe tool open stage
Temperature offset amount
G cools down straight line
Claims (9)
1. a kind of method for manufacturing the steel plate member (7) of hot forming and press quenching, the steel plate member (7) is big by having
In 1500MPa, the hardenable steel making for the tensile strength (Rm) for being preferably greater than 1650MPa to 2250MPa, existed with the method
It is heat-treated beyond sheet metal (6) in the heat treatment step on the specific austenitizing temperature Ac3 of material, is walked in subsequent merging
In rapid, there is merging temperature (θ1) sheet metal (6) be presented in forming tool (3), in press quenching step, make described
Steel plate member (7) hot forming, and at the same time steel plate member (7) is made to be cooled to taking-out temperature (θ4), and in taking out step, it will
With taking-out temperature (θ4) steel plate member (7) take out from the open forming tool (3), which is characterized in that in press quenching
In step, the steel plate member (7) is cooled to taking-out temperature (θ in the case where forming tool (3) are closed4), the taking-up
Temperature (θ4) be in close within the temperature range of the specific martensite transfor mation finishing temperature Mf of material, particular on martensite transfor mation
Within the temperature range of +/- the 10% of finishing temperature Mf, in martensite transfor mation finishing temperature from austenite to martensite
The most of termination of transformation.
2. method as described in claim 1, which is characterized in that the taking-out temperature (θ4) with temperature offset amount (Δ θ2) be less than
Martensite transfor mation finishing temperature, and in taking out step, it will be with the taking-out temperature less than martensite transfor mation finishing temperature
(θ4) steel plate member (7) take out.
3. method as described in claim 1 or 2, which is characterized in that the press quenching step starts from the forming tool
(3) pent shut-in time point (t2), and so designing press quenching step so that cooling variation in time follows
Cooling curve, in the cooling curve, steel plate member temperature is from the shut-in time point (t2) with it is big, especially greater than 27
DEG C/the first cooling rate (a of s1) it is reduced to transit time point (t3), and in the cooling curve, in transit time point
(t3) after further time change in, second transition cooling rate (a of the steel plate member (7) to substantially reduce2) into one
Step is cooled, until occurring having third cooling rate (a3) flat cooling straight line (G), the third cooling rate (a3)
Especially about 15 DEG C/s to 3 DEG C/s.
4. method as described in claim 3, which is characterized in that the steel plate member temperature is in transit time point (t3), especially exist
The starting point of cooling straight line (G) is with temperature offset amount (Δ θ1) it is higher than martensite transfor mation finishing temperature Mf, but it is specific less than material
Ms (martensite start) point Ms is opened in the Ms (martensite start) point Ms transformation of austenite to martensite
Begin.
5. method as described in one of preceding claims, which is characterized in that the forming tool (3) has heating unit (9),
Using the heating unit (9) can to towards the steel plate member (7) tool-face heating or temperature adjustment, and it is especially described at
Shape tool (3) is heated in press quenching step, is more specifically heated to less than martensite transfor mation finishing temperature Mf, especially
Its tool temperature (θ in 100 DEG C to 250 DEG C rangesW), thus, it is possible to the cooling curve in press quenching step is arranged.
6. method as described in one of preceding claims, which is characterized in that taking out step (t4) after further technological process
In, cooling procedure is not interrupted and is continued for, more precisely especially with the 4th cooling rate (a4) carry out, described the
Four cooling rate (a4) and the third cooling rate (a3) compared to being further reduced, be especially reduced to 1 DEG C/s to 5 DEG C/s.
7. method as described in one of preceding claims, which is characterized in that taking out step (t4) after further technological process
In, the steel plate member (7) is transferred in stacking station (5), in the stacking station (5), is carried out by using surrounding air
Air cooling continues cooling procedure.
8. method as described in one of preceding claims, which is characterized in that the side can be applied on sheet metal component (7)
There is the carbon content C, preferably C more than 0.25% mass percent to be more than 0.27% to 0.40% for method, the sheet metal component (7)
Between mass percent, and alloying component is preferably comprised, the alloying component contributes to stabilization of austenite and thus obtains
To the also component institutional framework containing retained austenite, such as Si other than martensite>0.5% mass percent.
9. method as described in one of preceding claims, which is characterized in that yield strength 0.2% extends limit or bullet in other words
Property the limit (Rp) be more than 1100MPa, preferably 1250MPa to 1950MPa.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102017202294.9A DE102017202294B4 (en) | 2017-02-14 | 2017-02-14 | Process for producing a hot-formed and press-hardened sheet steel component |
| DE102017202294.9 | 2017-02-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108425001A true CN108425001A (en) | 2018-08-21 |
Family
ID=61131951
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810140264.5A Pending CN108425001A (en) | 2017-02-14 | 2018-02-11 | Method for the steel plate member for manufacturing hot forming and press quenching |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3360621A1 (en) |
| CN (1) | CN108425001A (en) |
| DE (1) | DE102017202294B4 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020053242A1 (en) | 2018-09-13 | 2020-03-19 | Husqvarna Ab | Cutting blade for a robotic work tool |
| CN112792501A (en) * | 2019-11-13 | 2021-05-14 | 大众汽车股份公司 | Method for producing a thermally modified and press-hardened steel sheet component |
| CN113439126A (en) * | 2019-02-13 | 2021-09-24 | 蒂森克虏伯钢铁欧洲股份公司 | Method for manufacturing steel plate member |
| CN113597474A (en) * | 2019-03-20 | 2021-11-02 | 日本制铁株式会社 | Hot-stamped molded body |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102019208040A1 (en) * | 2019-06-03 | 2020-12-03 | Volkswagen Aktiengesellschaft | Process for the production of a hot-formed and press-hardened sheet steel component |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103687968A (en) * | 2011-07-21 | 2014-03-26 | 株式会社神户制钢所 | Method for producing hot-pressed steel member |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005032113B3 (en) * | 2005-07-07 | 2007-02-08 | Schwartz, Eva | Thermal deformation and partial hardening apparatus, e.g. for automobile components, comprises mold of at least two parts, each formed from segments adjustable to different temperatures |
| DE102006019395A1 (en) * | 2006-04-24 | 2007-10-25 | Thyssenkrupp Steel Ag | Apparatus and method for forming blanks of higher and highest strength steels |
| EP2014777B1 (en) * | 2007-07-11 | 2013-01-09 | Neue Materialien Bayreuth GmbH | Method and device for thermal treatment of metal sheet |
| SE532160C2 (en) * | 2008-03-12 | 2009-11-03 | Gestamp Hardtech Ab | Ways to mold and harden a sheet metal |
| DE102013010946B3 (en) | 2013-06-28 | 2014-12-31 | Daimler Ag | Method and plant for producing a press-hardened sheet steel component |
| DE102016113542B3 (en) | 2016-07-22 | 2017-08-24 | Benteler Defense Gmbh & Co. Kg | Method for producing a tank component |
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2017
- 2017-02-14 DE DE102017202294.9A patent/DE102017202294B4/en active Active
-
2018
- 2018-01-23 EP EP18152864.7A patent/EP3360621A1/en not_active Withdrawn
- 2018-02-11 CN CN201810140264.5A patent/CN108425001A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103687968A (en) * | 2011-07-21 | 2014-03-26 | 株式会社神户制钢所 | Method for producing hot-pressed steel member |
Non-Patent Citations (2)
| Title |
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| 庞国星: "《工程材料与成形技术基础》", 30 September 2005, 机械工业出版社 * |
| 林建平等: ""硼钢板相比例控制试验方法及试验参数的确定", 《同济大学学报（自然科学版）》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020053242A1 (en) | 2018-09-13 | 2020-03-19 | Husqvarna Ab | Cutting blade for a robotic work tool |
| EP3847882A2 (en) | 2018-09-13 | 2021-07-14 | Husqvarna Ab | Cutting blade for a robotic work tool |
| CN113439126A (en) * | 2019-02-13 | 2021-09-24 | 蒂森克虏伯钢铁欧洲股份公司 | Method for manufacturing steel plate member |
| CN113597474A (en) * | 2019-03-20 | 2021-11-02 | 日本制铁株式会社 | Hot-stamped molded body |
| CN112792501A (en) * | 2019-11-13 | 2021-05-14 | 大众汽车股份公司 | Method for producing a thermally modified and press-hardened steel sheet component |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102017202294A1 (en) | 2018-08-16 |
| EP3360621A1 (en) | 2018-08-15 |
| DE102017202294B4 (en) | 2019-01-24 |
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