CN115770812A - Device and method for preparing hot stamping forming part - Google Patents
Device and method for preparing hot stamping forming part Download PDFInfo
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- CN115770812A CN115770812A CN202211560471.9A CN202211560471A CN115770812A CN 115770812 A CN115770812 A CN 115770812A CN 202211560471 A CN202211560471 A CN 202211560471A CN 115770812 A CN115770812 A CN 115770812A
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- 238000000034 method Methods 0.000 title abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 199
- 238000007599 discharging Methods 0.000 claims abstract description 99
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000004080 punching Methods 0.000 claims abstract description 8
- 238000004891 communication Methods 0.000 claims abstract description 3
- 238000002955 isolation Methods 0.000 claims description 30
- 238000002360 preparation method Methods 0.000 claims description 17
- 238000004519 manufacturing process Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000003466 welding Methods 0.000 claims description 7
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 abstract description 24
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 24
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 23
- 239000011248 coating agent Substances 0.000 abstract description 23
- 238000000576 coating method Methods 0.000 abstract description 23
- 239000007789 gas Substances 0.000 description 23
- 239000000463 material Substances 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 238000012360 testing method Methods 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 3
- 238000007731 hot pressing Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000010079 rubber tapping Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004070 electrodeposition Methods 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 229910018125 Al-Si Inorganic materials 0.000 description 1
- 229910018520 Al—Si Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000006356 dehydrogenation reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000003562 lightweight material Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000013001 point bending Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Images
Classifications
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- 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
-
- 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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Heat Treatment Of Articles (AREA)
- Forging (AREA)
Abstract
The invention provides a device and a method for preparing large-batch hot stamping forming parts. The device comprises a heating furnace unit and a hot stamping unit; the heating furnace unit is provided with a plurality of independent air-tight chambers, and comprises a feeding chamber, a heating chamber and a discharging chamber which are communicated in sequence; the hot stamping unit comprises a stamping machine; the discharge chamber is in communication with the punch. The device of the invention is used for carrying out air-tight heat treatment and punching forming on the blank, in particular to the aluminum-silicon coating blank, and the produced high-strength aluminum-silicon coating part has hydrogen content obviously lower than that of the high-strength aluminum-silicon coating part produced by the traditional atmosphere furnace, has small hydrogen embrittlement risk, and is particularly suitable for hot-forming aluminum-silicon coating parts with strength more than or equal to 1500MPa.
Description
Technical Field
The invention relates to the field of hot stamping, in particular to a device and a method for preparing a hot stamping forming part.
Background
At present, in the hot stamping industry, the most widely applied aluminum-silicon coating plate can effectively prevent the oxidation problem of the blank in the austenitizing heating process. Therefore, the atmosphere in the heating furnace which is commonly used at present does not need to be controlled by oxygen potential, and the water vapor content is controlled by controlling the dew point of the gas. However, the aluminum-silicon coating is easy to react with residual water vapor in hot air in the heating process of continuous mass production in a common atmosphere furnace to generate hydrogen, which causes hydrogen-induced delayed fracture. Hydrogen induced delayed fracture, also known as hydrogen embrittlement, is a phenomenon in which hydrogen atoms dissolve in a metal material to cause weakening or embrittlement of the metal material. Hydrogen accelerates crack propagation within the metal, causing the fracture surface characteristics of the metal to change from ductile to brittle. At present, in actual production, the dew point in an austenitizing furnace is generally required to be controlled to be between-15 ℃ and-20 ℃, and the production of water vapor in a heating furnace is hindered, so that the water vapor is prevented from generating hydrogen by the reduction reaction with surface elements such as iron, aluminum, silicon and the like. However, since the roller hearth heating furnace and the box-type heating furnace commonly used in the actual mass production do not have a plurality of airtight cavities, when the blank enters and exits the heating furnace, the external air containing a large amount of water vapor enters the cavities of the heating furnace, so that the dew point atmosphere in the furnace is difficult to control. Also because of the long residence time of the blank in the furnace due to equipment failure, these can cause a significant amount of hydrogen atoms to be absorbed inside the aluminum-silicon coating, thereby creating a risk of hydrogen embrittlement. In addition, at present, dry air is introduced into an austenitizing heating furnace to control water vapor in the heating furnace, and the problem of hydrogen absorption of the aluminum-silicon coating in the heating process can only be solved. In the manufacturing process of the aluminum-silicon coated plate, a steel plate enters molten aluminum, a large amount of hydrogen is absorbed in the aluminum liquid, dry high-purity nitrogen is usually introduced into the aluminum liquid for dehydrogenation, but part of hydrogen always exists in the aluminum liquid, and the part of hydrogen cannot be removed in an austenitizing furnace by controlling the dew point. Although vacuum heating is generally applied in the heat treatment industry, the conventional vacuum heating equipment is only suitable for small parts, and the heating period is measured in hours, so that the requirements of large size and high cycle time (tens of seconds) of automobile body parts cannot be met. Therefore, hot forming and heating of aluminum-silicon coated steel sheets have been conventionally carried out in non-airtight continuous roll hearth type and box type furnaces.
With the continuous promotion of oil consumption regulations, the requirement of automobile light weight is urgent, and more light weight materials are applied to various automobile parts. In recent years, hot-formed Steel sheets (PHS) are favored by various automobile factories due to their advantages of ultrahigh strength, good formability, high dimensional accuracy, and the like, and are widely used for automobile structural members. At present, PHS with tensile strength of 1500MPa is applied in large scale, and PHS with tensile strength of more than 1800MPa can be produced in large scale in some steel mills. But the higher the strength, the greater its risk of hydrogen embrittlement. 1500MPa steels already present a risk of hydrogen delayed fracture, which is greater and more severe for 1800MPa, and even 2000MPa steels. The hydrogen embrittlement problem severely limits the application of the ultra-high strength steel aluminum silicon coating material with the pressure of more than 1800 MPa. And for the coated steel plate with the grade of 1500Mpa, the elongation rate is required to be more than 5 percent, while the coated steel plate with the grade of 1800Mpa or more has the elongation rate of about 4 percent and the bending angle of between 35 and 40 degrees. This lack of toughness results in brittle fracture of the coated panels above 1800Mpa during impact, which severely affects the application of the coated panels above 1800 Mpa.
Disclosure of Invention
In order to overcome the defects in the prior art, solve the problem of hydrogen embrittlement of a coated plate of over 1800Mpa and improve the toughness of a coated steel plate of 1800Mpa, the first aim of the invention is to provide a device for preparing large-batch hot stamping forming parts; the second purpose of the invention is to provide a preparation method of a large-batch hot stamping part; the third purpose of the invention is to provide the hot stamping part with the aluminum-silicon coating prepared by the method.
The purpose of the invention is realized by the following technical scheme:
in one aspect, the present invention provides an apparatus for preparing large batches of hot stamped parts, the apparatus comprising:
a heating furnace unit and a hot stamping unit;
the heating furnace unit is provided with a plurality of independent air-tight chambers, and comprises a feeding chamber, a heating chamber and a discharging chamber which are communicated in sequence; the hot stamping unit comprises a stamping machine;
the discharge chamber is in communication with the punch.
In the above apparatus, preferably, the inlet of the feeding chamber has an airtight feeding door; a first isolating furnace door with air tightness is arranged between the outlet of the feeding chamber and the inlet of the heating chamber.
In the above apparatus, preferably, the outlet of the discharging chamber has an airtight discharging door; and a second isolation furnace door with air tightness is arranged between the inlet of the discharging chamber and the outlet of the heating chamber.
In the above apparatus, preferably, the heating chamber is selected from a vacuum chamber and an atmosphere chamber.
In the above apparatus, when the heating chamber is a vacuum chamber, the vacuum degree in the heating chamber is preferably 1 to 10000Pa, preferably 100 to 1000Pa, and the temperature in the chamber is 880 to 1000 ℃, preferably 930 ℃; the heating chamber is used for heating a plurality of groups of blanks simultaneously.
In the above apparatus, preferably, when the heating chamber is an atmosphere chamber, the atmosphere in the heating chamber is dry air or other dry gas, and the dry air or other dry gas has a moisture content of less than 1000ppm (volume fraction), preferably 100ppm (volume fraction); the air pressure in the cavity is outdoor atmospheric pressure, the temperature in the cavity is 880-1000 ℃, and 930 ℃ is preferable; the heating chamber is used for heating a plurality of groups of blanks simultaneously.
In the above device, the temperature of the discharge chamber is preferably 400 to 800 ℃, preferably 600 to 700 ℃.
In the above apparatus, preferably, a feeding platform is disposed upstream of the feeding chamber; and a discharging platform is arranged at the downstream of the discharging chamber.
On the other hand, the invention also provides a preparation method of large-batch hot stamping forming parts, which adopts the device for preparation and comprises the following steps:
feeding the blank into an airtight feeding cavity, and then exhausting the feeding cavity to reach a certain vacuum degree;
then sending the blank to an airtight heating chamber for austenitizing heating to obtain a hot blank;
the hot blank is sent to an airtight discharging cavity;
and transferring the blank conveyed out through the discharging cavity to a punching machine for hot punching and forming.
In the above preparation method, preferably, the blank is fed into the feeding chamber through a feeding furnace door; the blanks in the feeding chamber are conveyed to the heating chamber through a first isolating furnace door; the hot blank in the heating chamber is conveyed to a discharge chamber through a second isolation furnace door; the blanks in the outfeed chamber are fed into the punch press via an outfeed oven door.
In the above-described manufacturing method, preferably, the ingot includes an aluminum silicon coating ingot.
In the above preparation method, preferably, when the heating chamber is a vacuum chamber, after the blank enters the feeding chamber through the feeding furnace door, the feeding chamber is pumped to a vacuum degree higher than 10000Pa, preferably 100 to 1000Pa;
and after the vacuum degree in the feeding cavity is close to that of the heating cavity, opening a first isolation furnace door between the feeding cavity and the heating cavity, feeding the blank into the heating cavity for austenitizing heating, and closing the first isolation furnace door between the feeding cavity and the heating cavity.
In the above preparation method, preferably, when the heating chamber is a vacuum chamber, before the blank is prepared for discharge after the heat treatment in the heating chamber, the discharge chamber is evacuated to a vacuum degree higher than 10000Pa, preferably 100 to 1000Pa;
after the vacuum degree in the discharging cavity is close to that in the heating cavity, a second isolating furnace door between the discharging cavity and the heating cavity is opened, the blank is fed into the discharging cavity, and then the second isolating furnace door between the discharging cavity and the heating cavity is closed;
before a discharging furnace door of the discharging chamber is opened, after the discharging chamber is filled with dry air or other dry gas to reach outdoor air pressure, the discharging furnace door is opened.
In the above preparation method, preferably, when the heating chamber is a dry atmosphere chamber, after the blank enters the feeding chamber through the feeding furnace door, the feeding chamber is pumped to a vacuum degree higher than 10000Pa, preferably 100 to 1000Pa; then introducing dry air or other dry gas into the feeding chamber, wherein the water vapor content of the dry air or other dry gas is less than 1000ppm, preferably 100ppm;
after the air pressure in the feeding cavity is close to that of the heating cavity, a first isolation furnace door between the feeding cavity and the heating cavity is opened, the blank is fed into the heating cavity for austenitizing heating, and then the first isolation furnace door between the feeding cavity and the heating cavity is closed.
In the above preparation method, preferably, when the heating chamber is a vacuum chamber, before the blank is prepared for discharge after the heat treatment in the heating chamber, the discharge chamber is evacuated to a vacuum degree higher than 10000Pa, preferably 100 to 1000Pa; then introducing dry air or other dry gas into the discharging chamber, wherein the content of water vapor in the dry air or other dry gas is less than 1000ppm, preferably 100ppm;
after the air pressure in the discharging cavity is close to that of the heating cavity, a second isolating furnace door between the discharging cavity and the heating cavity is opened, the blank is conveyed into the discharging cavity, and then the second isolating furnace door between the discharging cavity and the heating cavity is closed;
before a discharging furnace door of the discharging chamber is opened, after the discharging chamber is filled with dry air or other dry gas to reach outdoor air pressure, the discharging furnace door is opened.
In the above manufacturing method, preferably, the hot stamping in the stamping machine includes laser tailor-welding the discharged blank.
In the above production method, it is preferable that the temperature of the material to be subjected to the hot stamping molding in the stamping machine is controlled to be less than 7 ℃/s within a range of 500 to 700 ℃.
In another aspect, the invention also provides a hot stamping part with an aluminum-silicon coating, which is prepared by the preparation method.
The hot-stamped part preferably has a tensile strength of at least 1500MPa.
The production cycle time of the hot-stamped part is preferably 20-40 s.
The invention has the beneficial effects that:
the invention adopts the heating furnace with the airtight chamber and pumps out the gas in the chamber to achieve the vacuum degree of more than 10000 Pa. The water vapor content value in the heating furnace is less than 1000ppm, and the corresponding dew point value of 1000ppm is about-15 ℃. At the moment, the heating can be carried out through two heating modes, one mode is that after the air is pumped out by a heating furnace with an independent chamber, the drying air with a lower dew point value is introduced, and the air pressure inside and outside the heating furnace is kept consistent. The other is heating in the airtight chamber under certain vacuum degree, i.e. vacuum heating. In addition, the vacuum heating is beneficial to the diffusion of hydrogen in the raw material of the blank into the vacuum, and the reduction of the hydrogen content in the raw material is facilitated. The three independent air-tight chambers are skillfully adopted to avoid the defects of the common vacuum furnace. The atmosphere of the heating chamber for accommodating a plurality of groups of blanks and heating simultaneously is always kept in a certain vacuum degree or a certain dry atmosphere, and frequent air extraction from one atmosphere to a certain vacuum degree is not needed for the heating chamber. The damage of high-temperature air exhaust to the vacuum pumping equipment is avoided, and the long time required by air exhaust of a large-volume chamber is avoided. Only the feeding and discharging chamber is pumped. The feeding and discharging cavity only accommodates one group of blanks, so that the volume is small and the air suction time is short. If a single independent chamber is used for feeding, discharging and heating, high-temperature gas with the temperature of more than 900 ℃ is pumped, and vacuumizing equipment can be seriously damaged; secondly, because batch production requires multiple groups of blanks to be heated simultaneously, if the space of the feeding and discharging chamber is large, the vacuum pumping time is too long. The discharging chamber is provided with a certain furnace temperature, and is one of the innovation points of the invention. This is because the blank needs to be rapidly transferred to a press for press forming after being heated by austenite. If the conveying time exceeds 12 seconds, the martensite structure content in the product after the hot press quenching is insufficient, and the mechanical property of the product is unqualified. When the blank comes out of the heating cavity and passes through the discharging cavity, the waiting time is provided in the discharging cavity, and the furnace door outside the discharging cavity is waited to be opened. This results in an excessive time for the blank to reach the press, which affects the mechanical properties of the product. The inventor researches to find that if the discharging cavity is kept at a certain temperature, the blank can keep enough temperature during the waiting period of the discharging cavity, and the mechanical property of the product after being conveyed to the press for pressing is qualified. And although the discharging chamber needs to be pumped, the gas temperature is far lower than that of the heating chamber, and the vacuum pumping equipment is not adversely affected.
In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of an apparatus for manufacturing large-scale hot-stamped parts according to the present invention.
Fig. 2 is a graph showing the results of a spot welding test of the hot stamp-formed part prepared in example 1 of the present invention.
Fig. 3 is a structural adhesive test result diagram of the hot stamping part prepared in example 1 of the present invention.
Fig. 4 is a graph showing the results of an electrodeposition coating test on the hot stamp-formed part prepared in example 1 of the present invention.
Description of the symbols of the drawings:
1. a blank; 2. a feeding platform; 3. a feed oven door; 4. a feed chamber; 5. a first isolation oven door; 6. a heating chamber; 7. a second isolation oven door; 8. a discharge chamber; 9. a discharge furnace door; 10. a discharge platform; 11. and (4) a punching machine.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides an apparatus for preparing a large-batch hot stamping part, as shown in fig. 1, the apparatus including:
a heating furnace unit and a hot stamping unit; the heating furnace unit is provided with a plurality of independent air-tight chambers, and comprises a feeding chamber 4, a heating chamber 6 and a discharging chamber 8 which are communicated in sequence; the hot stamping unit includes a stamping press 11; the discharge chamber 8 communicates with a punch 11.
In a preferred embodiment, the inlet of the feeding chamber 4 has a gas-tight feeding oven door 3; a first isolation furnace door 5 with air tightness is arranged between the outlet of the feeding chamber 4 and the inlet of the heating chamber 6.
In a preferred embodiment, the outlet of the outfeed chamber 8 has an air-tight outfeed oven door 9; a second isolating furnace door 7 with air tightness is arranged between the inlet of the discharging chamber 8 and the outlet of the heating chamber 6.
In a preferred embodiment, the heating chamber 6 is selected from a vacuum chamber or an atmospheric chamber.
In a preferred embodiment, when the heating chamber 6 is a vacuum chamber, the vacuum degree in the heating chamber 6 is 1 to 10000Pa, preferably 100 to 1000Pa, and the temperature in the chamber is 880 to 1000 ℃, preferably 930 ℃; the heating chamber 6 is used for heating multiple groups of blanks simultaneously.
In a preferred embodiment, when the heating chamber 6 is an atmosphere chamber, the atmosphere in the heating chamber 6 is dry air or other dry gas having a moisture content of less than 1000ppm (volume fraction), preferably 100ppm (volume fraction); the air pressure in the cavity is outdoor atmospheric pressure, the temperature in the cavity is 880-1000 ℃, and 930 ℃ is preferable; the heating chamber 6 is used to heat multiple groups of blanks simultaneously.
In a preferred embodiment, the temperature of the tapping chamber 8 is 400 to 800 ℃, preferably 650 ℃.
In a preferred embodiment, upstream of the feeding chamber 4, a feeding platform 2 is provided; downstream of the tapping chamber 8 a tapping platform 10 is arranged.
The embodiment also provides a preparation method of a large-batch hot stamping part, which adopts the device for preparation and comprises the following steps:
the blank 1 is sent into an airtight feeding chamber 4, and then the feeding chamber 4 is pumped to reach a certain vacuum degree;
then, the blank is sent to a heating cavity 6 with air tightness for austenitizing and heating to obtain a hot blank;
the hot blank is sent to a discharge chamber 8 with air tightness;
the blank conveyed out through the discharge chamber 8 is transferred to a press machine 11 for hot press forming.
In a preferred embodiment, the blanks 1 are fed into the feeding chamber 4 via a feeding oven door 3; the blanks in the feeding chamber 4 are sent to the heating chamber 6 via a first insulating oven door 5; the hot blank in the heating chamber 6 is sent to the discharging chamber 8 through a second isolation furnace door 7; the blanks in the outfeed chamber 8 are fed via an outfeed oven door 9 into a press 11.
In a preferred embodiment, the blank 1 is selected from an aluminum silicon coated blank.
In a preferred embodiment, when the heating chamber 6 is a vacuum chamber, after the blank 1 enters the feeding chamber 4 through the feeding furnace door 3, the feeding chamber 4 is pumped to a vacuum degree higher than 10000Pa, preferably 100-1000 Pa;
after the vacuum degree in the feeding chamber 4 is close to the vacuum degree of the heating chamber 6, the first isolation oven door 5 between the feeding chamber 4 and the heating chamber 6 is opened, the blank is sent into the heating chamber 6 for austenitizing heating, and then the first isolation oven door 5 between the feeding chamber 4 and the heating chamber 6 is closed.
In a preferred embodiment, when the heating chamber 6 is a vacuum chamber, the discharge chamber 8 is evacuated to a vacuum degree higher than 10000Pa, preferably 100 to 1000Pa before the blank is ready to be discharged from the furnace after the heat treatment of the heating chamber 6 is completed;
after the vacuum degree in the discharging chamber 8 is close to the vacuum degree in the heating chamber 6, then opening a second isolation furnace door 7 between the discharging chamber 8 and the heating chamber 6, feeding the blank into the discharging chamber 8, and then closing the second isolation furnace door 7 between the discharging chamber 8 and the heating chamber 6;
before the discharging furnace door 9 of the discharging chamber 8 is opened, after the discharging chamber 8 is filled with dry air or other dry gas to reach the outdoor air pressure, the discharging furnace door 9 is opened.
In a preferred embodiment, when the heating chamber 6 is a dry atmosphere chamber, after the blank 1 enters the feeding chamber 4 through the feeding furnace door 3, the feeding chamber 4 is pumped to a vacuum degree higher than 10000Pa, preferably 100-1000 Pa; then introducing dry air or other dry gas into the feeding chamber 4, wherein the water vapor content of the dry air or other dry gas is lower than 1000ppm, preferably 100ppm;
after the gas pressure in the feeding chamber 4 approaches the gas pressure of the heating chamber 6, the first separating oven door 5 between the feeding chamber 4 and the heating chamber 6 is then opened, the blank is fed into the heating chamber 6 for austenitizing heating, and then the first separating oven door 5 between the feeding chamber 4 and the heating chamber 6 is closed.
In a preferred embodiment, when the heating chamber 6 is a vacuum chamber, the discharge chamber 8 is evacuated to a vacuum degree higher than 10000Pa, preferably 100 to 1000Pa before the blank is ready to be discharged from the furnace after the heat treatment of the heating chamber 6 is completed; then introducing dry air or other dry gas into the discharging chamber 8, wherein the content of water vapor in the dry air or other dry gas is less than 1000ppm, preferably 100ppm;
after the air pressure in the discharging chamber 8 is close to the air pressure of the heating chamber 6, then opening a second isolating furnace door 7 between the discharging chamber 8 and the heating chamber 6, feeding the blank into the discharging chamber 8, and then closing the second isolating furnace door 7 between the discharging chamber 8 and the heating chamber 6;
before the discharging furnace door 9 of the discharging chamber 8 is opened, after the discharging chamber 8 is filled with dry air or other dry gas to reach the outdoor air pressure, the discharging furnace door 9 is opened.
In a preferred embodiment, the method of hot stamping in the stamping press 11 includes laser tailor welding the discharged blank.
In a preferred embodiment, the temperature of the material to be hot-stamped in the stamping press 11 is controlled to be less than 7 ℃/s within a range of 500 to 700 ℃.
The embodiment also provides an aluminum-silicon plated hot stamping part which is prepared by the preparation method.
In a preferred embodiment, the hot stamped part has a tensile strength of 1500MPa or more.
In a preferred embodiment, the cycle time of the hot-stamped part is between 20 and 40 seconds.
The invention is illustrated in detail below by means of specific examples:
example 1:
firstly, feeding a hot-pressed blank plate material aluminum-silicon coating plate with the tensile strength of 1800MPa after hot pressing of 1.8mm into a vacuum furnace with three airtight chambers, namely a feeding chamber 4, a heating chamber 6 and a discharging chamber 8. Wherein the vacuum degree of the heating chamber of the vacuum furnace is 10Pa. The process comprises the following steps: before the blank enters the feeding chamber 4, the feeding chamber 4 is filled with air to reach the outdoor air pressure, the feeding furnace door 3 is opened, the blank is fed in, and the feeding furnace door 3 is closed. The feeding chamber 4 starts to pump out air and reaches a vacuum degree of 10-100Pa, then a first isolation furnace door 5 with air tightness between the feeding chamber 4 and the heating chamber 6 is opened, and the blank is sent into the heating chamber 6 for heating. After the austenitizing heating is completed the blank is ready to be fed into the discharge chamber 8. Before the airtight second isolation furnace door 7 between the heating chamber 6 and the discharging chamber 8 is opened, the discharging chamber 8 needs to be vacuumized to make the vacuum degree reach 10-100 Pa. The second insulating oven door 7 is then opened and the blank is fed into the outfeed chamber 8. The second isolation oven door 7 is then closed. Before the discharging furnace door 9 is opened, the discharging chamber 8 is filled with dry air or other dry gas with dew point of minus 45 ℃ to reach outdoor air pressure, and then the discharging furnace door 9 is opened. The furnace temperature was 930 degrees, the heating time was 300 seconds, and the billet was sent out of the furnace door and sent to the press 11 for press molding.
Example 2:
firstly, feeding a hot-pressed blank plate material aluminum-silicon coating plate with the tensile strength of 1800MPa after hot pressing of 1.8mm into a vacuum furnace with three airtight chambers, namely a feeding chamber 4, a heating chamber 6 and a discharging chamber 8. Wherein the vacuum degree of the heating chamber of the vacuum furnace is 10Pa. The process comprises the following steps: before the blank enters the feeding chamber 4, the feeding chamber 4 is filled with air to reach the outdoor air pressure, the feeding furnace door 3 is opened, the blank is fed, and the feeding furnace door 3 is closed. The feeding chamber 4 starts to pump air out and reaches the vacuum degree of 10-100Pa, then a first isolation furnace door 5 with air tightness between the feeding chamber 4 and the heating chamber 6 is opened, and the blank is sent into the heating chamber 6 for heating. After the austenitizing heating is completed the blank is ready to be fed into the discharge chamber 8. Before the second isolation furnace door 7 with air tightness between the heating chamber 6 and the discharging chamber 8 is opened, the discharging chamber 8 is vacuumized to make the vacuum degree reach 10-100 Pa. The second insulating oven door 7 is then opened and the blank is fed into the outfeed chamber 8. The second isolation oven door 7 is then closed. Before the discharging furnace door 9 is opened, the discharging chamber 8 is filled with dry air or other dry gas with dew point of minus 45 ℃ to reach outdoor air pressure, and then the discharging furnace door 9 is opened. The furnace temperature was 930 degrees, the heating time was 600 seconds, and the billet was sent out of the furnace door and sent to the press 11 for press molding.
Example 3:
firstly, a hot-stamping blank plate material aluminum-silicon coating plate with the tensile strength of 1800Mpa after hot pressing of 1.8mm is sent into an atmosphere furnace with three airtight chambers, namely a feeding chamber 4, a heating chamber 6 and a discharging chamber 8. Wherein the dew point of the atmosphere in the heating chamber 6 of the atmosphere furnace is-45 ℃ and the air pressure is one atmosphere. The process comprises the following steps: before the blank enters the feeding chamber 4, the feeding chamber 4 is filled with air to reach the outdoor air pressure, the feeding furnace door 3 is opened, the blank is fed in, the feeding furnace door 3 is closed, the feeding chamber 4 is pumped out of air and reaches the vacuum degree of 10-100Pa, and then the feeding chamber 4 is filled with dry air with the dew point of minus 45 ℃ to reach the air pressure of the heating chamber 6, namely the atmospheric pressure. The airtight first insulating oven door 5 between the feeding chamber 4 and the heating chamber 6 is then opened and the blank is fed into the heating chamber 6 for heating. After the austenitizing heating is completed the blank is ready to be fed into the discharge chamber 8. Before the airtight second isolation furnace door 7 between the heating chamber 6 and the discharging chamber 8 is opened, the discharging chamber 8 is vacuumized to make the vacuum degree reach 10-100Pa and is filled with dry air with the dew point of minus 45 ℃ to reach the air pressure of the heating chamber 6, namely, the atmospheric pressure. The second isolation oven door 7 is then opened, the blanks are fed into the outfeed chamber 8, and then the second isolation oven door 7 is closed. The furnace temperature was 930 ℃ and the heating time was 300s. And opening the discharging furnace door 9, and conveying the blank out of the furnace door and into a punching machine 11 for punching and forming.
Comparative example 1:
firstly, a hot stamping plate material 22MnB5 aluminum-silicon coating plate with the thickness of 1.8mm and the pressure of 1800Mpa is placed into an atmosphere furnace with the dew point of-5 ℃ for heating, the furnace temperature is 930 ℃, the heating time is 300s, and the plate material is placed on a stamping machine for stamping forming after austenitizing and heating.
Comparative example 2:
firstly, a hot stamping plate material 22MnB5 aluminum-silicon coating plate with the thickness of 1.8mm and the pressure of 1800Mpa is placed into an atmosphere furnace with the dew point of-5 ℃ for heating, the furnace temperature is 930 ℃, the heating time is 600s, and the plate material is placed on a stamping machine for stamping forming after austenitizing and heating.
Comparative example 3:
firstly, a hot stamping plate material 22MnB5 aluminum-silicon coating plate with the thickness of 1.8mm and the pressure of 1800Mpa is placed into an atmosphere furnace with the dew point of-5 ℃ for heating, the furnace temperature is 930 ℃, the heating time is 300s, and the plate material is placed on a stamping machine for stamping forming after austenitizing and heating.
Comparative example 4:
firstly, a hot stamping plate material 22MnB5 aluminum-silicon coating plate with the thickness of 1.8mm and the pressure of 1800Mpa is placed into an atmosphere furnace with the dew point of-5 ℃ for heating, the furnace temperature is 930 ℃, the heating time is 600s, and the plate material is placed on a stamping machine for stamping forming after austenitizing and heating.
Table 1 performance results of examples and comparative examples
The parts prepared in example 1 and example 2 and comparative example 1, comparative example 2, comparative example 3 and comparative example 4 were sprayed with salt spray for 10 minutes at 4 hour intervals under neutral salt spray, and the results are shown in table 2.
TABLE 2 comparison of four-point bending Performance between examples and comparative examples
The parts prepared in example 1 were subjected to a spot welding test, and the experimental results are shown in table 3 below and fig. 2, and it can be seen that the weldability Ok thereof is.
TABLE 3 test results of spot welding
The structural adhesive test was performed on the parts prepared in example 1, and the results are shown in fig. 3, and it can be seen that the adhesive property is OK.
The parts prepared in example 1 were subjected to the electrodeposition coating test, and the results are shown in FIG. 4, where it can be seen that the coatability was OK.
In addition, as can be seen from tables 1 and 2, the parts produced by the method have lower diffusible hydrogen content, higher elongation than that of the parts produced by the method of the ordinary atmosphere furnace, better bending property and lower risk of hydrogen embrittlement. The welding performance, the adhesion problem and the coating performance are all not problematic. The reason is that the method reacts with the Al-Si coating under vacuum condition when the part is heated 2 Less O molecules and less diffusible hydrogen are generated by the reaction. H in the furnace when the ordinary atmosphere furnace is heated 2 More O molecules and more hydrogen generated by the reaction with the aluminum-silicon coatingAnd the internal stress of the heated austenite blank after entering the austenite blank and then forming martensite by cooling is increased, so that the defects are increased, and the elongation, the bending angle and the hydrogen embrittlement risk are increased.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (20)
1. An apparatus for preparing a large batch of hot stamped parts, the apparatus comprising:
a heating furnace unit and a hot stamping unit;
the heating furnace unit is provided with a plurality of independent air-tight chambers, and comprises a feeding chamber, a heating chamber and a discharging chamber which are communicated in sequence; the hot stamping unit comprises a stamping machine;
the discharge chamber is in communication with the punch.
2. The apparatus of claim 1, wherein: the inlet of the feeding chamber is provided with a feeding furnace door with air tightness; a first isolating furnace door with air tightness is arranged between the outlet of the feeding chamber and the inlet of the heating chamber.
3. The apparatus of claim 1, wherein: the outlet of the discharging chamber is provided with a discharging furnace door with air tightness; and a second isolating furnace door with air tightness is arranged between the inlet of the discharging chamber and the outlet of the heating chamber.
4. The apparatus according to any one of claims 1 to 3, wherein: the heating chamber is selected from a vacuum chamber or an atmosphere chamber.
5. The apparatus of claim 4, wherein: when the heating chamber is a vacuum chamber, the vacuum degree in the heating chamber is 1-10000 Pa, preferably 100-1000 Pa, and the temperature in the chamber is 880-1000 ℃, preferably 930 ℃; the heating chamber is used for heating a plurality of groups of blanks simultaneously.
6. The apparatus of claim 4, wherein: when the heating chamber is an atmosphere chamber, the atmosphere in the heating chamber is dry air or other dry gas, the dry air or other dry gas has a water vapor content of less than 1000ppm (volume fraction), preferably 100ppm (volume fraction); the air pressure in the cavity is outdoor atmospheric pressure, the temperature in the cavity is 880-1000 ℃, and 930 ℃ is preferred; the heating chamber is used for heating a plurality of groups of blanks simultaneously.
7. The apparatus of claim 1, wherein: the temperature of the discharging chamber is 400-800 ℃, preferably 600-700 ℃.
8. The apparatus of claim 1, wherein: a feeding platform is arranged at the upstream of the feeding chamber; and a discharging platform is arranged at the downstream of the discharging chamber.
9. A method of manufacturing a large batch of hot-stamped parts using the apparatus of any one of claims 1 to 8, comprising the steps of:
feeding the blank into an airtight feeding cavity, and then exhausting the feeding cavity to reach a certain vacuum degree;
then, the blank is sent to an airtight heating chamber to be subjected to austenitizing heating to obtain a hot blank;
the hot blank is sent to an airtight discharging cavity;
and transferring the blank conveyed out through the discharging chamber to a punching machine for hot punching forming.
10. The method of manufacturing of claim 9, wherein the blanks are fed into a feed chamber via a feed oven door; the blanks in the feeding chamber are conveyed to the heating chamber through a first isolating furnace door; the hot blank in the heating chamber is conveyed to a discharge chamber through a second isolation furnace door; the blanks in the outfeed chamber are fed into the punch press via an outfeed oven door.
11. The method of manufacturing according to claim 9, wherein the billet comprises an aluminum silicon coated billet.
12. The preparation method according to claim 10, wherein when the heating chamber is a vacuum chamber, after the blank enters the feeding chamber through the feeding furnace door, the feeding chamber is pumped to a vacuum degree higher than 10000Pa, preferably 100-1000 Pa;
and after the vacuum degree in the feeding cavity is close to that of the heating cavity, opening a first isolation furnace door between the feeding cavity and the heating cavity, feeding the blank into the heating cavity for austenitizing heating, and closing the first isolation furnace door between the feeding cavity and the heating cavity.
13. The preparation method according to claim 10 or 12, characterized in that when the heating chamber is a vacuum chamber, the blank is pumped to a vacuum degree higher than 10000Pa, preferably 100-1000 Pa before being discharged from the furnace after the heat treatment of the heating chamber;
after the vacuum degree in the discharging chamber is close to the vacuum degree in the heating chamber, a second isolation furnace door between the discharging chamber and the heating chamber is opened, the blank is fed into the discharging chamber, and then the second isolation furnace door between the discharging chamber and the heating chamber is closed;
before the discharging furnace door of the discharging chamber is opened, dry air or other dry gas is filled into the discharging chamber to reach the outdoor air pressure, and then the discharging furnace door is opened.
14. The preparation method according to claim 10, wherein when the heating chamber is a dry atmosphere chamber, after the blank enters the feeding chamber through the feeding furnace door, the feeding chamber is pumped to a vacuum degree higher than 10000Pa, preferably 100-1000 Pa; then introducing dry air or other dry gas into the feeding chamber, wherein the water vapor content of the dry air or other dry gas is less than 1000ppm, preferably 100ppm;
after the air pressure in the feeding cavity is close to the air pressure of the heating cavity, a first isolation furnace door between the feeding cavity and the heating cavity is opened, the blank is fed into the heating cavity to be subjected to austenitizing heating, and then the first isolation furnace door between the feeding cavity and the heating cavity is closed.
15. The preparation method according to claim 10 or 12, characterized in that when the heating chamber is a vacuum chamber, the blank is pumped to a vacuum degree higher than 10000Pa, preferably 100-1000 Pa, before the blank is discharged from the furnace after the heat treatment of the heating chamber; then introducing dry air or other dry gas into the discharging chamber, wherein the content of water vapor in the dry air or other dry gas is less than 1000ppm, preferably 100ppm;
after the air pressure in the discharging cavity is close to that of the heating cavity, a second isolating furnace door between the discharging cavity and the heating cavity is opened, the blank is conveyed into the discharging cavity, and then the second isolating furnace door between the discharging cavity and the heating cavity is closed;
before a discharging furnace door of the discharging chamber is opened, after the discharging chamber is filled with dry air or other dry gas to reach outdoor air pressure, the discharging furnace door is opened.
16. The method of manufacturing according to claim 9 or 10, wherein the hot stamping in a stamping press includes laser tailor-welding the discharged blank.
17. The production method according to claim 9 or 10, wherein the temperature of the blank subjected to the hot press forming in the press is controlled to be less than 7 ℃/s within a range of 500 to 700 ℃.
18. An aluminum-silicon coated hot-stamped part produced by the production method according to any one of claims 9 to 17.
19. The hot-stamped part of claim 18, wherein the hot-stamped part has a tensile strength
≥1500MPa。
20. A hot-stamped part according to claim 18, wherein the takt time of the hot-stamped part is between 20 and 40 s.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2023/074748 WO2024021560A1 (en) | 2022-07-28 | 2023-02-07 | Device and method for manufacturing hot-stamped part |
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| CN2022108965356 | 2022-07-28 | ||
| CN202210896535.6A CN115318912A (en) | 2022-07-28 | 2022-07-28 | Device and method for preparing hot stamping forming part |
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| CN202210896535.6A Withdrawn CN115318912A (en) | 2022-07-28 | 2022-07-28 | Device and method for preparing hot stamping forming part |
| CN202211560471.9A Pending CN115770812A (en) | 2022-07-28 | 2022-12-07 | Device and method for preparing hot stamping forming part |
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| JP4551169B2 (en) * | 2004-09-15 | 2010-09-22 | 新日本製鐵株式会社 | Manufacturing method of high strength parts |
| CN102896391B (en) * | 2012-10-15 | 2015-10-07 | 泗阳群鑫电子有限公司 | A kind of chain type vacuum furnace |
| CN104862459A (en) * | 2015-06-15 | 2015-08-26 | 李华良 | Isolated-type vacuum non-oxidation tempering device |
| CN104988288B (en) * | 2015-07-29 | 2017-10-31 | 西安市北恒实业有限公司 | A kind of hydrogen-free atmosphere protection Technology for Heating Processing entirely without decarburization of steel |
| CN207552388U (en) * | 2017-12-15 | 2018-06-29 | 重庆市大足区月明热处理厂 | A kind of feeding in continuous material vacuum heat treatment furnace |
| CN109518114A (en) * | 2018-08-08 | 2019-03-26 | 宝山钢铁股份有限公司 | The manufacturing method and hot stamping part of hot stamping part with alusil alloy coating |
| CN109365604A (en) * | 2018-11-16 | 2019-02-22 | 苏州普热斯勒先进成型技术有限公司 | A kind of hot stamping method and the drop stamping production line using heating in vacuum |
| CN111974856A (en) * | 2019-05-23 | 2020-11-24 | 苏州普热斯勒先进成型技术有限公司 | Vacuum oxygen-free heating furnace, hot stamping production line thereof and hot stamping method |
| DE102020116126A1 (en) * | 2020-06-18 | 2021-12-23 | Bilstein Gmbh & Co. Kg | Process for press hardening of hot-formable blanks |
| CN115318912A (en) * | 2022-07-28 | 2022-11-11 | 苏州普热斯勒先进成型技术有限公司 | Device and method for preparing hot stamping forming part |
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