CN104942111A - Method for producing hot-forming part with variable strength and lower die base of die - Google Patents
Method for producing hot-forming part with variable strength and lower die base of die Download PDFInfo
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- CN104942111A CN104942111A CN201510376477.4A CN201510376477A CN104942111A CN 104942111 A CN104942111 A CN 104942111A CN 201510376477 A CN201510376477 A CN 201510376477A CN 104942111 A CN104942111 A CN 104942111A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 104
- 238000000034 method Methods 0.000 claims abstract description 25
- 230000008569 process Effects 0.000 claims abstract description 16
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 8
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 6
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 6
- 229910001562 pearlite Inorganic materials 0.000 claims abstract description 6
- 238000010791 quenching Methods 0.000 claims abstract description 6
- 230000000171 quenching effect Effects 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims description 55
- 239000000498 cooling water Substances 0.000 claims description 45
- 238000003856 thermoforming Methods 0.000 claims description 40
- 238000010438 heat treatment Methods 0.000 claims description 28
- 238000004080 punching Methods 0.000 claims description 21
- 229910000712 Boron steel Inorganic materials 0.000 claims description 18
- 238000009413 insulation Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 abstract description 9
- 230000007704 transition Effects 0.000 abstract description 2
- 238000003754 machining Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- 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
- B21D37/10—Die sets; Pillar guides
-
- 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)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention relates to the field of hot forming, and discloses a method for producing a hot-forming part with variable strength and a lower die base of a die. The method comprises the steps that a plate material which is fully austenitized is put into the die for producing the hot-forming part to be stamped; in the stamping process, the area, needing to be machined to be in high strength, of the plate material is rapidly cooled to the temperature less than T<3> DEG C under the condition that the cooling rate V<1> is larger than the critical quenching rate V of the plate material, and the high strength area only provided with martensite microstructures is obtained; the area, needing to be machined to be in low strength, of the plate material is cooled to be within the preset temperature ranging from T<4> DEG C to T<5> DEG C under the condition that the cooling rate V<2> is smaller than V, and the low strength area which is simultaneously provided with austenite, bainite and/or pearlite microstructures is obtained; after the pressure is kept for a preset time period t<2>, stamping is completed, and the hot forming part with the variable strength is obtained. Compared with the prior art, according to the method for producing the hot-forming part with the variable strength and the lower die base of the die, the temperature control over the areas with different strength requirements in the part is flexible and effective, a transition area is narrow, and the situation of scrapping of the part can be avoided as much as possible.
Description
Technical field
The present invention relates to thermo forming fields, particularly a kind ofly produce the method for intensity adjustable thermoforming part and the die shoe of mould.
Background technology
Intensity adjustable thermoforming part, refers to and there is different intensity area in same thermoforming part.As in partial automobile part, wish in Same Part, subregion tensile strength is greater than 1300MPa, to realize the intensity of superelevation; And another part field strength is less than 800MPa, to realize regional area weakening strength, and then realize clashing into crumple and absorbing impact energy.
Usually use the raw material that the boron steel that a kind of trade mark is 22MnB5 is produced as thermoforming at present, tensile strength is about 600MPa, and microstructure is ferrite-pearlite.As shown in Figure 1, during production, first raw-material coiled material is gone out required sheet material shape through blanking operation stamping-out; Then by automatic mechanical hand, sheet material is sent in heating furnace; In heating furnace, sheet material is heated to 930 DEG C ~ 950 DEG C and is incubated at least 5min and makes its lasting austenitizing; The sheet material of red heat is passed in mould through the automation conveyer of production line and carries out punching press, and passing time is about 8s, and carry out Cooling Quenching through mould inside that is cold, that close and carry out pressurize, the dwell time is about 8 ~ 12 s, and pressure is about 40MPa; Now cooldown rate exceedes minimum critical speed 27K/s, and when being cooled fast to temperature lower than 400 DEG C, material carries out sufficient martensitic structure transformation, obtains the thermoforming part of tensile strength up to the high strength of 1500MPa, high rigidity, low resilience.
The CCT curve of 22MnB5 thermoforming material as shown in Figure 2, is schemed known thus, uses different cooldown rates to cool this thermoforming material and can obtain different Fine Texture of Materials, and diverse microcosmic organizes content in the product different.Along with the increase of cooldown rate, the material hardness obtained also improves thereupon.In current thermoforming production process, the cooling velocity of part is made to be less than quenching critical speed 27K/S by the cooling water flow velocity controlling mould, the material phase transformation in forming parts process is made to avoid entering austenite+Bainite Region (in figure A+B), ensure that material carries out martensitic traoformation (in figure M) fully, obtain the product material hardness, yield strength and the tensile strength that require.
By analyzing thermoforming material CCT curve above, we may safely draw the conclusion: in theory, and by controlling the rate of temperature fall of material, we can obtain different Fine Texture of Materials.Consider the factor such as plate heating, plate transmission, punching press quenching in thermoforming production process, and cooling velocity about 10 ~ 15 DEG C/S when the sheet material raw material of red heat exposes in atmosphere, sheet material raw material exposes Homogeneous cooling in aerial process and can not obtain the material property of expection.
Although there is the method much controlling sheet material raw material regional area cooldown rate now, mostly cannot accurately control, effect is bad.
Summary of the invention
goal of the invention:for problems of the prior art, the invention provides and a kind ofly produce the method for intensity adjustable thermoforming part and the die shoe of mould, the regional temperature different to requirement of strength controls flexibly effectively, and transitional region is narrow, can avoid part rejection as far as possible.
technical scheme:the invention provides a kind of method of producing intensity adjustable thermoforming part, comprise following steps: S1: will be used for processing the sheet material heating raw materials of described intensity adjustable thermoforming part to T
1~ T
2dEG C and be incubated at least t
1min, makes its complete austenitizing; S3: in the process of described punching press, will need the region of being processed into high strength to be greater than the cooldown rate V of the quenching critical speed V of described sheet material raw material in described sheet material raw material
1be quickly cooled to and be less than T
3dEG C, only be there is the high intensity region of martensite microstructure; To in described sheet material raw material, need the region of being processed into weak intensity to be less than the cooldown rate V of described V
2be cooled to T
4~ T
5dEG C, be there is the weak intensity region of austenite, bainite and/or pearlite microstructure simultaneously; S4: pressurize preset time period t
2rear end punching press, obtains described intensity adjustable thermoforming part.
Present invention also offers a kind of die shoe producing the mould of intensity adjustable thermoforming part, comprise master controller, die shoe forming blocks, assisted heating device, temperature-detecting device, temperature controller, temperature control block, flow speed controller and cooling water generator; Described die shoe forming blocks comprises at least one weak district forming blocks and at least one high district forming blocks, described temperature control block is pressed abd fixed on below described weak district forming blocks, described temperature-detecting device to be fixed in described weak district forming blocks and to be electrically connected with described temperature controller, described assisted heating device is external equipment, before the sheet material raw material of complete austenitizing is transferred in described mould and carries out punching press, described assisted heating device effectively contacts with the upper profile of described weak district forming blocks, and described weak district forming blocks is being heated to T
4~ T
5after DEG C, remove described assisted heating device; Described temperature controller and described flow speed controller are all connected with described master controller signal; Described cooling water generator is communicated with the cooling water pipe in described high district forming blocks, and described cooling water generator is also communicated with the cooling water pipe in described temperature control block by described flow speed controller.
Further, the die shoe of the mould of described production intensity adjustable thermoforming part also comprises heat-insulation layer, and described heat-insulation layer is wrapped in the sidewall one week of described weak district forming blocks.
Further, described assisted heating device comprises heater strip, Heat Conduction Material, cable and control box, it is outside that described Heat Conduction Material is wrapped in described heater strip, described Heat Conduction Material effectively contacts with the upper profile of described weak district forming blocks, and described heater strip is electrically connected with described control box by described cable.
Preferably, the boron steel of described sheet material raw material to be the trade mark be 22MnB5; Described T
1=900, described T
2=950, described t
1=5, described V=27k/s, described T
3=400 DEG C, described T
4=400 DEG C, described T
5=500 DEG C, described t
2=8 ~ 12s.
Preferably, the weak intensity region in described intensity adjustable thermoforming part and the transitional region width between high intensity region are 20 ~ 50mm.
Preferably, described T
4=400 DEG C, described T
5=500 DEG C.
operation principle and beneficial effect:when intensity adjustable thermoforming part produced by needs, first by the complete austenitizing of sheet material raw material, while by sheet material raw material austenitizing, use assisted heating device that die shoe forming blocks Shang Ruo district forming blocks is heated to preset temperature range T
4~ T
5dEG C, then immediately the sheet material raw material of complete austenitizing is put in die shoe forming blocks after assisted heating device being taken away, and ensure to need the region of being processed into high strength to be placed on above die shoe forming blocks Zhong Gao district forming blocks, to need the region of being processed into weak intensity to be placed on the top of weak district forming blocks in sheet material raw material, then punching press is carried out to it, in the process of punching press, a part for the cooling water that cooling water generator occurs flows in the cooling water pipe in high district forming blocks with certain flow velocity, and this flow velocity is wanted to ensure V
1> V, only can be had the high intensity region of martensite microstructure after ensureing to cool; Another part cooling water that cooling water generator occurs first flows in the cooling water pipe in the temperature control block below weak district forming blocks again after flow speed controller coutroi velocity, and the flow velocity of the cooling water after flow speed controller controls is wanted to ensure V
2< V, the weak intensity region of austenite, bainite and/or pearlite microstructure can be had after ensureing to cool simultaneously, meanwhile, in order to ensure the material property in weak intensity region, sheet material raw material temperature in whole punching course in this region all will remain on T always
4~ T
5dEG C, this temperature range is coordinated by master controller, temperature-detecting device, temperature controller, temperature control block and flow speed controller to realize, and control mode is as follows: when temperature is greater than T
5time, master controller can increase the flow velocity of the cooling water that cooling water generator occurs by coutroi velocity controller, namely increases V
2, but to V be kept all the time
2be less than V; When temperature is greater than T
4be less than T
5time, master controller can the constant flow rate of the coutroi velocity controller cooling water that keeps cooling water generator to occur, namely keeps V as far as possible
2constant; Owing to being continuous seepage, weak district forming blocks overlying contact to the initial temperature of sheet material raw material be all greater than T
5, and then the temperature of Hui Jiangruo district forming blocks raises, so the temperature of weak district forming blocks is generally not less than T
4, so do not consider that temperature is less than T
4situation do not consider; Visible, by the Lower die base structure of mould of the present invention, can the sheet material contact raw of high temperature to normal temperature weak district forming blocks before just weak district forming blocks is first heated to T by room temperature
4~ T
5within the scope of DEG C, avoid the sheet material contact raw of heat to occur cracking to the weak district forming blocks of normal temperature, reduce part rejection rate; And water velocity in high district forming blocks in cooling water pipe is always very high, so to the cooling velocity of the high temperature sheet raw material contacted with the high district forming blocks of normal temperature quickly, the temperature of the two contact Hou Gao district forming blocks can reduce very soon, the two temperature difference is not too large, negligible, therefore also can not cause sheet material raw material and scrap impact; The main purpose of above-mentioned temperature control process is to ensure that the material property machining rear weak intensity region sheet material raw material meets expection.Visible by the above-mentioned description to making process, by method and apparatus in the present invention with the use of, can to the temperature of die shoe forming blocks Zhong Ruo district forming blocks and cooldown rate V
2carry out accurately, in time, effectively controlling, and then carry out accurately, in time, effectively controlling to the temperature of the sheet material raw material above weak district forming blocks and cooldown rate, make the intensity adjustable thermoforming part be processed into can reach the material property of expection, narrow between the transition zone in part between high intensity region and weak intensity region.
Accompanying drawing explanation
Fig. 1 is the flow chart that hot pressing is produced;
The CCT curve of Fig. 2 to be the trade mark be boron steel of 22MnB5;
Fig. 3 is the sectional view of sheet material raw material when being positioned in the die shoe forming blocks of the mould producing intensity adjustable thermoforming part;
Sectional view during Fig. 4 to be external assisted heating device be weak district forming blocks heating;
Fig. 5 is the structural representation of sheet material raw material;
Fig. 6 is the structural representation of the intensity adjustable thermoforming part using the sheet material raw material in Fig. 5 to produce by method of the present invention and Lower die base structure.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in detail.
embodiment 1:
Present embodiments provide for a kind of die shoe producing the mould of intensity adjustable thermoforming part, as shown in Figure 3, die shoe forming blocks is divided into high district forming blocks 22 and weak district forming blocks 21 two parts (also can be divided into multiple high districts forming blocks 22 and multiple weak districts forming blocks 21, only to comprise a Ge Gao district forming blocks 22 and a Ge Ruo district forming blocks 21 is described in present embodiment), cooling water pipe 221 is provided with in high district forming blocks 22, and this cooling water pipe 221 is directly communicated with cooling water generator 8, the cooling water pipe 61 of weak district forming blocks 21 is arranged in the temperature control block 6 below weak district forming blocks 21, and this cooling water pipe 61 is communicated with cooling water generator 8 by a flow speed controller 7, in weak district, forming blocks 21 upper interior is also fixed with a temperature-detecting device 4, this temperature-detecting device 4 is electrically connected with temperature controller 5, temperature feedback in the weak district forming blocks 21 that temperature-detecting device 4 feeds back by temperature controller 5 is to master controller 1, master controller 1 controls according to this temperature convection speed controller 7 again, and then flow speed controller 7 can control the flow velocity of the cooling water that cooling water generator 8 occurs, and realizes the control to weak district forming blocks 21 temperature.
In present embodiment, before sheet material raw material 11 be put in mould carry out punching press, a first external assisted heating device 3 in the upper profile of weak district forming blocks 21, as Fig. 4, this assisted heating device 3 is by heater strip 31, Heat Conduction Material 32, cable 33 and control box 34 form, it is outside that Heat Conduction Material 32 is wrapped in heater strip 31, in use, guarantee that Heat Conduction Material 32 effectively contacts with the upper profile (the sheet material raw material 11 of instant heating forming part and the contact surface of weak district forming blocks 21) of weak district forming blocks 21, heater strip 31 is electrically connected with control box 31 by cable 33, can be preheated weak district forming blocks 21 in advance by this assisted heating device 3, before ensureing that sheet material raw material 11 in red heat contacts with die shoe forming blocks, the temperature of weak district forming blocks 21 has reached a default temperature range T
4~ T
5dEG C, and the temperature of high district forming blocks 22 remains room temperature.
When using this mould to carry out work, first the sheet material raw material 11 being used for processing intensity adjustable thermoforming part is heated to preset temperature range T
1~ T
2dEG C and be incubated t
1min, makes sheet material raw material 11 complete austenitizing, while sheet material raw material 11 carries out austenitizing, by external assisted heating device 3, weak district forming blocks 21 is heated to T4 ~ T5 DEG C, then the die shoe forming blocks again the sheet material raw material 11 of red heat being placed on this mould after being withdrawn by assisted heating device 3 carries out punching press, sheet material raw material 11 is being put in the process in die shoe forming blocks, should be noted that and will in sheet material raw material 11, need the region of being processed into high strength to be placed on above high district forming blocks 22, be placed on above weak district forming blocks 21 by needing the region of being processed into weak intensity, start after placing to carry out punching press to sheet material raw material 11.
In the process of above-mentioned punching press:
(1) cooling water of the quick flowing occurred by cooling water generator 8 abrim in the cooling water pipe 221 of forming blocks 22 inside, high district, so that the heat of the sheet material raw material 11 contacted with high district forming blocks 22 can be taken away rapidly, the cooldown rate V of the sheet material raw material 11 above Shi Gao district forming blocks 22
1the critical cooling rate V being greater than this sheet material raw material 11 that can be stable, is cooled at sheet material raw material 11 and is less than T
3namely obtain the microstructure of abundant formation of martensite below DEG C, obtain high material property and part strength;
(2) in weak district forming blocks, owing to being continuous seepage, can constantly have the sheet material raw material of high temperature to be placed in die shoe forming blocks, and the original temperature of weak district forming blocks 21 is preheated T by assisted heating device
4~ T
5dEG C, the sheet material raw material of high temperature is after touching weak district forming blocks 21, and the temperature of weak district forming blocks 21 must be greater than T
5; And be weaker than the sheet material raw material 11 above high district forming blocks 22 in order to the material property and part strength that ensure the sheet material raw material 11 above weak district forming blocks 21, need during production to keep weak district forming blocks 21 at T always
4~ T
5in DEG C, present embodiment is in the following manner to above-mentioned T
4, T
5and V
2control:
When temperature-detecting device 4 detects that the temperature of weak district forming blocks 21 is greater than T5, master controller 1 coutroi velocity controller 7 reduces the flow velocity of the cooling water that cooling water generator 8 occurs, and namely reduces V
2; When temperature is greater than T
4be less than T
5time, the constant flow rate of the cooling water that master controller 1 coutroi velocity controller 7 keeps cooling water generator 8 to occur, namely keeps V as far as possible
2constant; Owing to being continuous seepage, temperature in weak district forming blocks 21 is generally all be greater than T4 all the time, in order to can this point be ensured, present embodiment can also note the end face (with the profile of thermoforming feature contacts) of weak district forming blocks 21 with bottom surface (face contacted with temperature control block 6) without the need to wrapping up heat-insulation layer 9 at the sidewall surrounding parcel one layer of heat preservation floor 9(of weak district forming blocks 21), so the situation being less than T4 is not herein considered.The whole process of above-mentioned adjustment has austenite and bainite owing to needing to ensure or mixes the pearlite of part machining in the sheet material raw material 11 above Hou Ruo district forming blocks 21, to ensure that corresponding material property and part strength are weaker than high intensity region 22, then need the cooldown rate V controlling weak district forming blocks 21
2all the time V is less than.
The main purpose of above-mentioned temperature control process is to ensure that the material property of the sheet material raw material 11 machining rear weak intensity region meets expection, according to set T
4and T
5difference, microstructure in sheet material raw material 11 above weak district forming blocks 21 has corresponding change, it is few that content due to now martensite microstructure compares high intensity region, and the material property of the sheet material raw material 11 therefore above weak district forming blocks 21 and part strength are weaker than material property and the part strength of the sheet material raw material 11 above high district forming blocks 22 accordingly.
(3) process of above-mentioned (1) and (2) over time, and high district forming blocks 22 and weak district forming blocks 21 all reach stable poised state, pressurize preset time t
2rear end punching press, obtains intensity adjustable thermoforming part.
As illustrated in Figures 5 and 6, the width of the weak intensity region in the intensity adjustable thermoforming part that obtains of present embodiment and the transitional region 10 between the high intensity region spacing of two dotted lines (in the Fig. 6) general control is within 20 ~ 50mm.
embodiment 2:
Present embodiment for sheet material raw material for the boron steel that the trade mark is 22MnB5 is described.
First boron steel sheet material 11 be heated to 900 ~ 950 DEG C and be incubated at least 5min, make boron steel sheet material 11 complete austenitizing, while by boron steel sheet material 11 austenitizing, use external assisted heating device 3 that weak district forming blocks 21 is heated to 400 ~ 500 DEG C, then assisted heating device 3 is taken away in the die shoe forming blocks that immediately the boron steel sheet material 11 of red heat is delivered to again in embodiment 1 and carry out punching press, transmittance process continues 8s, and ensure in boron steel sheet material 11, to need the region of being processed into high strength to be placed on above high district forming blocks 22, the region of being processed into weak intensity is needed to be placed on above weak district forming blocks 21, punching press is started after placing, in the process of punching press: (1) is 221 cooling waters being full of the quick flowing occurred by cooling water generator 8 in the cooling water pipe of forming blocks 22 inside, high district, the cooldown rate V of the boron steel sheet material 11 above Shi Gao district forming blocks 22
1the stable critical cooling rate 27k/s being greater than boron steel, at above-mentioned V
1cooldown rate under, the boron steel sheet material 11 above high district forming blocks 22 is quickly cooled to lower than 400 DEG C, (2) in weak district forming blocks 21, after the boron steel sheet materials 11 of 900 ~ 950 DEG C touch weak district forming blocks 21, because weak district forming blocks 21 temperature now (400 ~ 500 DEG C) is less than the temperature of boron steel sheet material 11, so the temperature of weak district forming blocks 21 can raise, when temperature-detecting device 4 detects that the temperature of weak district forming blocks 21 is greater than 500 DEG C, master controller 1 coutroi velocity controller 7 increases the flow velocity of the cooling water that cooling water generator 8 occurs, and namely increases V
2but, V be kept
2be less than 27k/s, when temperature-detecting device 4 detect the temperature of weak district forming blocks 21 be greater than 400 DEG C be less than 500 DEG C time, the constant flow rate of the cooling water that master controller 1 coutroi velocity controller 7 keeps cooling water generator 8 to occur, namely keeps V as far as possible
2constant.Said process terminates punching press after continuing 8 ~ 12s, obtain intensity adjustable thermoforming boron steel part, the tensile strength of the high intensity region (boron steel sheet material 11 corresponding above high district forming blocks 22) in this part is about 1500MPa, and the tensile strength of weak intensity region (boron steel sheet material 11 corresponding above weak district forming blocks 21) is about 800MPa.
Above-mentioned embodiment, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalent transformations of doing according to Spirit Essence of the present invention or modification, all should be encompassed within protection scope of the present invention.
Claims (7)
1. produce a method for intensity adjustable thermoforming part, it is characterized in that, comprise following steps:
S1: will be used for processing the sheet material heating raw materials of described intensity adjustable thermoforming part to T
1~ T
2dEG C and be incubated at least t
1min, makes its complete austenitizing;
S2: the mould that production thermoforming part put into by the described sheet material raw material of complete austenitizing is carried out punching press;
S3: in the process of described punching press, will need the region of being processed into high strength to be greater than the cooldown rate V of the quenching critical speed V of described sheet material raw material in described sheet material raw material
1be quickly cooled to and be less than T
3dEG C, only be there is the high intensity region of martensite microstructure; To in described sheet material raw material, need the region of being processed into weak intensity to be less than the cooldown rate V of described V
2be cooled to T
4~ T
5dEG C, be there is the weak intensity region of austenite, bainite and/or pearlite microstructure simultaneously;
S4: pressurize preset time period t
2rear end punching press, obtains described intensity adjustable thermoforming part.
2. the die shoe of the mould of production intensity adjustable thermoforming part according to claim 1, is characterized in that, the boron steel of described sheet material raw material to be the trade mark be 22MnB5; Described T
1=900, described T
2=950, described t
1=5, described V=27k/s, described T
3=400 DEG C, described T
4=400 DEG C, described T
5=500 DEG C, described t
2=8 ~ 12s.
3. produce the die shoe of the mould of intensity adjustable thermoforming part for one kind, it is characterized in that, comprise master controller (1), die shoe forming blocks (2), assisted heating device (3), temperature-detecting device (4), temperature controller (5), temperature control block (6), flow speed controller (7) and cooling water generator (8); Described die shoe forming blocks comprises at least one weak district forming blocks (21) and at least one high district forming blocks (22), described temperature control block (6) is pressed abd fixed on described weak district forming blocks (21) below, and described temperature-detecting device (4) to be fixed in described weak district forming blocks (21) and to be electrically connected with described temperature controller (5); Described assisted heating device (3) is external equipment, before the sheet material raw material of complete austenitizing is transferred in described mould and carries out punching press, described assisted heating device (3) effectively contacts with the upper profile of described weak district forming blocks (21), and described weak district forming blocks (21) is being heated to T
4~ T
5after DEG C, remove described assisted heating device (3); Described temperature controller (5) is all connected with described master controller (1) signal with described flow speed controller (7); Described cooling water generator (8) is communicated with the cooling water pipe (221) in described high district forming blocks (22), and described cooling water generator (8) is also communicated with the cooling water pipe (61) in described temperature control block (6) by described flow speed controller (7).
4. the die shoe of the mould of production intensity adjustable thermoforming part according to claim 3, is characterized in that, also comprise heat-insulation layer (9), and described heat-insulation layer (9) is wrapped in the sidewall one week of described weak district forming blocks (21).
5. the die shoe of the mould of production intensity adjustable thermoforming part according to claim 3, it is characterized in that, described assisted heating device (3) comprises heater strip (31), Heat Conduction Material (32), cable (33) and control box (34), it is outside that described Heat Conduction Material (32) is wrapped in described heater strip (31), in use, described Heat Conduction Material (32) effectively contacts with the upper profile of described weak district forming blocks (21), and described heater strip (31) is electrically connected with described control box (34) by described cable (33).
6. the die shoe of the mould of the production intensity adjustable thermoforming part according to any one of claim 3 ~ 5, is characterized in that, the weak intensity region in described intensity adjustable thermoforming part and transitional region (10) width between high intensity region are 20 ~ 50mm.
7. the die shoe of the mould of the production intensity adjustable thermoforming part according to any one of claim 3 ~ 5, is characterized in that, described T
4=400 DEG C, described T
5=500 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510376477.4A CN104942111A (en) | 2015-07-01 | 2015-07-01 | Method for producing hot-forming part with variable strength and lower die base of die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510376477.4A CN104942111A (en) | 2015-07-01 | 2015-07-01 | Method for producing hot-forming part with variable strength and lower die base of die |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104942111A true CN104942111A (en) | 2015-09-30 |
Family
ID=54157470
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| CN201510376477.4A Pending CN104942111A (en) | 2015-07-01 | 2015-07-01 | Method for producing hot-forming part with variable strength and lower die base of die |
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