CN103386444A - Cooling liquid direct cooling process and device of thermal forming mold based on boron steel plates - Google Patents
Cooling liquid direct cooling process and device of thermal forming mold based on boron steel plates Download PDFInfo
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- CN103386444A CN103386444A CN2013103149278A CN201310314927A CN103386444A CN 103386444 A CN103386444 A CN 103386444A CN 2013103149278 A CN2013103149278 A CN 2013103149278A CN 201310314927 A CN201310314927 A CN 201310314927A CN 103386444 A CN103386444 A CN 103386444A
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- 238000001816 cooling Methods 0.000 title claims abstract description 63
- 229910000712 Boron steel Inorganic materials 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000000110 cooling liquid Substances 0.000 title abstract 10
- 239000012809 cooling fluid Substances 0.000 claims description 57
- 229910000831 Steel Inorganic materials 0.000 claims description 29
- 239000010959 steel Substances 0.000 claims description 29
- 238000007493 shaping process Methods 0.000 claims description 13
- 239000002826 coolant Substances 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 3
- 230000013011 mating Effects 0.000 claims 1
- 238000004080 punching Methods 0.000 abstract description 5
- 238000007669 thermal treatment Methods 0.000 abstract 1
- 239000000047 product Substances 0.000 description 15
- 239000000498 cooling water Substances 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 8
- 238000010791 quenching Methods 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910000734 martensite Inorganic materials 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 4
- 239000002994 raw material Substances 0.000 description 3
- 238000003856 thermoforming Methods 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The invention provides a cooling liquid direct cooling process and a cooling liquid direct cooling device of a thermal forming mold based on boron steel plates in the technical field of thermal treatment plastic forming. The device comprises an upper mold, a lower mold, semi-open cooling liquid passages and a cooling liquid supply system, wherein the semi-open cooling liquid passages are arranged on the contact surfaces of the upper mold and the lower mold, a press machine adopts the cooling liquid supply system to provide cooling liquid for the molds, the upper mold and the lower mold respectively consist of a plurality of plane regions, convex corner regions and concave corner regions, and the semi-open cooling liquid passages are respectively arranged in the plane regions and the concave corner regions of the lower mold and the plane regions and the concave regions of the upper mold. Workpieces can be smoothly formed through the mold punching in the forming stage, and in addition, the direct cooling of the workpieces by the cooling liquid in the pressure maintaining cooling stage can also be realized.
Description
Technical field
What the present invention relates to is the method and apparatus in a kind of heat treatment plastic forming technology field, specifically a kind of the direct-cooled technique of cooling fluid and device of the hot-forming die based on the boron steel steel plate.
Background technology
The boron steel steel plate is as a series of hot forming steel plates, and production technology as shown in Figure 1, is divided into and is shaped and 2 stages of quench cooled, and wherein: shaping stage needs at high temperature by mould punching, to be shaped; Transformation from from the austenite microstructure to the martensite microstructure need to can occur by controlling certain cooling velocity in the quench cooled stage, and obtain high intensity and hardness: different according to the boron steel kind, its intensity can reach 500～2000MPa.After common hot forming, intensity reaches the boron steel chemical composition of 1500MPa and is:
| ? | C | Si | Mn | P | S | Cr | B |
| min | 0.20 | 0.20 | 1.00 | - | - | 0.15 | 0.0015 |
| max | 0.25 | 0.35 | 1.30 | 0.025 | 0.015 | 0.25 | 0.0050 |
The common die quenching type of cooling, be to arrange that at mould inside cooling water is as shown in Fig. 1 c at present.Be the boron steel workpiece under high temperature, enter the pressurize cooling stage after by mould punching, being shaped, at first transfer heat to mould steel, mould steel transfers heat to the cooling water that is arranged in wherein again, thereby realizes cooling to the boron steel workpiece; The cooling effectiveness of this mode workpiece, not only depend on arranging of cooling water channel, is subject to simultaneously the heat transfer efficiency of mould steel, belongs to the hot forming processing technology of the indirect cooling workpiece of cooling fluid.
Find through the retrieval to prior art, Chinese patent literature CN102939221A, disclose a day 2013-02-20, disclose the manufacture method of a kind of bumper bottom reinforcing material, it comprises: length is cut off the cut-out step of hardenability element interpolation steel pipe in accordance with regulations; The heat treatment step that the steel pipe that cuts off is heated with forming temperature; By utilizing extrusion die to carry out the hot-forming hot-forming step that is shaped to the shape of the horizontal part that possesses planar portions in both sides to the steel pipe of above-mentioned heating; And the horizontal part of institute's moulding under the state at the above-mentioned extrusion die of closure is carried out cooling cooling step fast.But this technology enters the pressurize cooling stage after by mould punching, being shaped, at first transfer heat to mould steel, and mould steel transfers heat to the cooling water that is arranged in wherein again, thereby realizes cooling to the boron steel workpiece; The cooling effectiveness of this mode workpiece, not only depend on arranging of cooling water channel, is subject to simultaneously the heat transfer efficiency of mould steel, belongs to the hot forming processing technology of the indirect cooling workpiece of cooling fluid.
Summary of the invention
The present invention is directed to the prior art above shortcomings, a kind of direct-cooled technique of cooling fluid and device of the hot-forming die based on the boron steel steel plate are proposed, both can by mould punching, workpiece be shaped smoothly at shaping stage, can realize the direct cooling workpiece of cooling fluid at the pressurize cooling stage again.
The present invention is achieved by the following technical solutions:
The present invention relates to a kind of direct-cooled technique of cooling fluid of the hot-forming die based on the boron steel steel plate, comprise the following steps:
The first step, with in the geometric properties of product section to be formed except straightway each circular arc portion be salient angle zone and re-entrant angle zone, and correspondence position in hot forming tool be set be:
I. the profile in the salient angle zone of hot forming tool is set to and the identical shape of product design to be formed;
Ii. the surface in the re-entrant angle zone of hot forming tool arranges some the semi-open cooling fluid passages that are interconnected, and the head end of this semi-open cooling fluid passage and end are connected to form coolant circuit with the coolant connection of hot forming tool respectively.
Second step, shaping stage: the boron steel steel plate is heated to austenitizing in heater after, is placed in hot forming tool and forms processing by the forcing press effect in the scope of 450～850 ℃.
The temperature of described austenitizing is 850～950 ℃.
Described connection refers to: be arranged in the part of the upper die of hot forming tool and the semi-open cooling fluid passage of part of the lower die and be communicated with respectively and form respectively one or several entrance and exit, with the outlet of forcing press, with entrance, be connected.
The 3rd step, pressurize cooling stage: input cooling fluid when keeping the hot forming tool closure in semi-open cooling fluid passage, make the coolant flow in semi-open cooling fluid passage and directly to workpiece, carry out cooling.
Described surface arranges and refers to: according to the size of the arc radius in the re-entrant angle zone of product mold to be formed, the direction biasing 0～L-3(mm) that reduces to arc radius also arranges the groove section width.Wherein: L is the re-entrant angle arc length.
The present invention relates to realize the device of above-mentioned technique, comprising: upper die and lower die, to be arranged at contact semi-open cooling fluid passage and the forcing press on surface of upper die and lower die be the cooling fluid feed system that mould is equipped with.Wherein: upper die and lower die form by several plane domains, salient angle zone and corresponding re-entrant angle zone, and described semi-open cooling fluid passage is arranged at respectively in the plane domain and re-entrant angle zone of the plane domain of counterdie and re-entrant angle zone and patrix.
Described device further preferably includes heater, work handling device and forcing press, to realize further automated production.
Technique effect
Compared with prior art, advantage of the present invention comprises:
1) core of the present invention is: taking full advantage of component shaping is this rule that the mould salient angle is shaped, re-entrant angle does not play the shaping effect, arrange coolant channels in mould re-entrant angle zone, neither affect the shaping of workpiece, can realize that again cooling fluid and the direct of workpiece contact, thereby realize be shaped, coolingly once complete.
2) the present invention is integrated into a station realization with component shaping and the direct Cooling Quenching of cooling fluid.In prior art, the technique of using cooling water, oil, the direct cooling boron steel steel plate workpiece of low temperature compression air is arranged, but must after component shaping, increase a station and be equipped with different operating modes, frock and equipment beyond forming station and realize.
3) the direct cooling workpiece of cooling fluid, cooling effectiveness is high.In prior art, the indirect cooling workpiece of mould steel that uses the internal placement cooling water is arranged, can realize that component shaping and Cooling Quenching complete at a station, but cooling water can not direct cooling workpiece, heat conducts by mould steel, cooling efficiency is not the efficiency of supply that depends on cooling fluid usually, but depends on the heat transfer efficiency of mould steel.Use this technique, can effectively improve cooling effectiveness.
4) the present invention can be used in conjunction with the indirect cooling technology of the indirect cooling workpiece of existing mold steel.On a specific workpiece, below several situations be difficult to realize evenly cooling:
I) the product geometric properties is complicated, and the indirect cooling water road is difficult to evenly arrange, and cooling dead angle even occurs;
Ii) product is clad steel plate (Patch-work), in a certain zone, is namely two-layered steel plates, by spot welding, links together.This zone is owing to being double-layer plate, and tradition cooling method cooling effectiveness indirectly is difficult to accomplish consistent with other zones;
Iii) product is laser assembly solder plate (Tailored Welded Blank), and plate itself is formed by the plate with laser welding of two or more different-thickness.Zones of different is because thickness is different, and tradition cooling method cooling effectiveness indirectly is difficult to accomplish consistent with other zones;
Iv) product is not for waiting material slab (Tailored Rolled Blank), and plate itself is rolled into the steel plate of two or more different-thickness by special cold-rolling process.Zones of different is because thickness is different, and tradition cooling method cooling effectiveness indirectly is difficult to accomplish consistent with other zones;
In above situation, according to actual needs, zones of different can freely be selected cooling fluid, and directly cooling or direct cooling cooperation is indirectly cooling, mutually supplements, and reaches evenly cooling, the purpose of enhancing productivity simultaneously.
Description of drawings
Fig. 1 is existing hot forming technology schematic diagram;
In figure: a is for adding post forming; B is by the pressurize quench cooled; C is die quenching cooling die schematic diagram.
Fig. 2 is mould structure sectional schematic diagram of the present invention;
In figure: patrix 1, counterdie 2, product workpiece 3, re-entrant angle zone 4, salient angle zone 5, semi-open cooling fluid passage 6, plane domain 7, the cooling fluid passage 8 of sealing.
Fig. 3 is embodiment mould structure schematic diagram.
Fig. 4 is semi-open cooling fluid passage schematic diagram in embodiment.
The specific embodiment
Below embodiments of the invention are elaborated, the present embodiment is implemented under take technical solution of the present invention as prerequisite, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 2, the present embodiment comprises: patrix 1, counterdie 2 and be arranged at patrix 1 and counterdie 2 contact the surface semi-open cooling fluid passage 6.Cooling passage is unified is the D9 semi-circular recesses, and the groove center distance is unified is 12mm.Forcing press is 400T thermoforming special pressure machine, and it is that initial temperature is controlled at the cooling water of 15～20 ℃ that cooling fluid is provided, and flow set is 120L/Min.
Workpiece is the thick boron steel steel plate of 1.5mm, length 1000mm, and cross-sectional width 150mm, the corner fillet is unified is R9,60 ℃ of drafting angles, i.e. arc length 9.42mm.
According to the feature of product workpiece 6, formed salient angle 2 and re-entrant angle 3 separately, and relevant range 4.In the hot forming process,, due to the existence of salient angle 2, can guarantee that workpiece is shaped according to product design; The pressurize cooling stage, serial cooling fluid passage 3,4 supply cooling fluids of arranging, directly carry out cooling to workpiece.
As shown in Figure 3, the direct-cooled method of the present invention and traditional indirect cooling method can be used in conjunction with, namely when the surface of hot forming tool arranges semi-open cooling fluid passage, the cooling fluid passage 8 of sealing is set further to improve the cooling effect of mould for the difformity object in the inside of hot forming tool.
Above-mentioned building mortion carries out concrete heat treatment by following steps:
1, the boron steel plate is got the raw materials ready
2, be heated to 900 ℃ with the plate complete austenitizing in heater
3, within 6 seconds, the boron steel plate being placed on mould
4, press initial openings height 800mm, and, shaping closed with the speed of 300mm/s
5, forcing press is kept closed, and keeps the pressure of 400T, injects cooling fluid with 120L/Min simultaneously, directly workpiece is carried out cooling 5 seconds fast, and the intensity that finally need to obtain is the martensitic structure of 1500MPa.
As shown in Figure 2, the present embodiment comprises: patrix 1, counterdie 2 and be arranged at patrix 1 and counterdie 2 contact the surface semi-open cooling fluid passage 6.Cooling passage is unified is the D6 semi-circular recesses, and the groove center distance is unified is 12mm.Forcing press is 150T thermoforming special pressure machine, and it is that initial temperature is controlled at the cooling water of 15～20 ℃ that cooling fluid is provided, and flow set is 50L/Min.
Workpiece is the thick boron steel steel plate of 1.5mm, length 300mm, and cross-sectional width 150mm, the corner fillet is unified is R6,60 ℃ of drafting angles, i.e. arc length 6.28mm.
According to the feature of product workpiece 6, formed salient angle 2 and re-entrant angle 3 separately, and relevant range 4.In the hot forming process,, due to the existence of salient angle 2, can guarantee that workpiece is shaped according to product design; The pressurize cooling stage, serial cooling fluid passage 3,4 supply cooling fluids of arranging, directly carry out cooling to workpiece.
As shown in Figure 4, calculate required cooling fluid path flow for meeting, semi-open cooling fluid passage can have different cross sections as required, can be both that (Fig. 4 a) for the circular groove structure, can be also inverted trapezoidal (Fig. 4 b) or rectangular recess (Fig. 4 c) structure, can also be circular arc and rectangle or trapezoidal combining structure (Fig. 4 d), do appropriateness adjustment according to the variation of product, cooling needs, the convenience of processing and manufacturing etc. fully.
Above-mentioned building mortion carries out concrete heat treatment by following steps:
1, the boron steel plate is got the raw materials ready
2, be heated to 900 ℃ with the plate complete austenitizing in heater
3, within 6 seconds, the boron steel plate being placed on mould
4, press initial openings height 600mm, and, shaping closed with the speed of 300mm/s
5, forcing press is kept closed, and keeps the pressure of 150T, injects cooling fluid with 50L/Min simultaneously, directly workpiece is carried out cooling 5 seconds fast, and the intensity that finally need to obtain is the martensitic structure of 1500MPa.
As shown in Figure 2, the present embodiment comprises: patrix 1, counterdie 2 and be arranged at patrix 1 and counterdie 2 contact the surface semi-open cooling fluid passage 6.Cooling passage is unified for 3mm is wide, the dark rectangular recess of 9mm, and the groove center distance is unified is 12mm.Forcing press is 400T thermoforming special pressure machine, and it is that initial temperature is controlled at the cooling water of 15～20 ℃ that cooling fluid is provided, and flow set is 120L/Min.
Workpiece is the thick boron steel steel plate of 2.5mm, length 1000mm, and cross-sectional width 150mm, the corner fillet is unified is R6,30 ℃ of drafting angles, i.e. arc length 3.14mm.
According to the feature of product workpiece 6, formed salient angle 2 and re-entrant angle 3 separately, and relevant range 4.In the hot forming process,, due to the existence of salient angle 2, can guarantee that workpiece is shaped according to product design; The pressurize cooling stage, serial cooling fluid passage 3,4 supply cooling fluids of arranging, directly carry out cooling to workpiece.
Above-mentioned building mortion carries out concrete heat treatment by following steps:
1, the boron steel plate is got the raw materials ready
2, be heated to 900 ℃ with the plate complete austenitizing in heater
3, within 6 seconds, the boron steel plate being placed on mould
4, press initial openings height 600mm, and, shaping closed with the speed of 300mm/s
5, forcing press is kept closed, and keeps the pressure of 400T, injects cooling fluid with 120L/Min simultaneously, directly workpiece is carried out cooling 5 seconds fast, and the intensity that finally need to obtain is the martensitic structure of 1500MPa.
Claims (8)
1. direct-cooled technique of the cooling fluid based on the hot-forming die of boron steel steel plate comprises the following steps:
The first step, with in the geometric properties of product section to be formed except straightway each circular arc portion be salient angle zone and re-entrant angle zone, and correspondence position in hot forming tool be set be:
I. the profile in the salient angle zone of hot forming tool is set to the shape of with product design to be formed, mating fully;
Ii. the surface in the re-entrant angle zone of hot forming tool arranges some the semi-open cooling fluid passages that are interconnected, and the head end of this semi-open cooling fluid passage and end are connected to form coolant circuit with the coolant connection of hot forming tool respectively;
Second step, shaping stage: the boron steel steel plate is heated to austenitizing in heater after, is placed in hot forming tool and forms processing by the forcing press effect in the scope of 450～850 ℃;
The 3rd step, pressurize cooling stage: input cooling fluid when keeping the hot forming tool closure in semi-open cooling fluid passage, make the coolant flow in semi-open cooling fluid passage and directly to workpiece, carry out cooling.
2. technique according to claim 1, is characterized in that, the temperature of described austenitizing is 850～950 ℃.
3. technique according to claim 1, it is characterized in that, described surface arranges and refers to: according to the size of the arc radius in the re-entrant angle zone of product mold to be formed, the direction biasing 0～L-3(mm) that reduces to arc radius also arranges the groove section width, and wherein: L is the re-entrant angle arc length.
4. technique according to claim 1, it is characterized in that, described connection refers to: be arranged in the part of the upper die of hot forming tool and the semi-open cooling fluid passage of part of the lower die and be communicated with respectively and form respectively one or several entrance and exit, with the outlet of forcing press, with entrance, be connected.
5. technique according to claim 1, is characterized in that, described cooling fluid is to the cooling velocity of workpiece more than or equal to 50 ℃/second, and the cooling fluid initial temperature is between 5～45 ℃.
6. device of realizing arbitrary above-mentioned technique in claim 1-5, it is characterized in that, device comprises: heater, work handling device, forcing press, upper die and lower die, be arranged at upper die and lower die the contact semi-open cooling fluid passage on surface and the cooling fluid feed system that provides for mould of forcing press.Wherein: upper die and lower die form by several plane domains, salient angle zone and corresponding re-entrant angle zone, and described semi-open cooling fluid passage is arranged at respectively in the plane domain and re-entrant angle zone of the plane domain of counterdie and re-entrant angle zone and patrix.
7. device according to claim 6, is characterized in that, the inside of described hot forming tool is provided with the cooling fluid passage of sealing.
8. device according to claim 6, is characterized in that, the cross section of described semi-open cooling fluid passage is circular groove structure, inverted trapezoidal groove structure, rectangular recess structure or its combination.
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| CN201310314927.8A CN103386444B (en) | 2013-07-24 | 2013-07-24 | The direct-cooled technique of cooling fluid based on the hot-forming die of boron steel steel plate and device |
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| CN201310314927.8A CN103386444B (en) | 2013-07-24 | 2013-07-24 | The direct-cooled technique of cooling fluid based on the hot-forming die of boron steel steel plate and device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107812838A (en) * | 2016-09-14 | 2018-03-20 | 大众汽车有限公司 | For making the hot forming tool of board member thermoforming |
| CN109433924A (en) * | 2018-11-28 | 2019-03-08 | 大连理工大学 | A kind of mold for realizing Quick-forming and quenching in mould |
| CN110918744A (en) * | 2019-12-19 | 2020-03-27 | 南京航空航天大学 | Hot forming process and device for synchronously and quickly cooling aluminum alloy high-rib integral wall plate |
| CN112453096A (en) * | 2020-10-10 | 2021-03-09 | 重庆至信实业集团有限公司 | Processing technology and equipment for sheet with different thicknesses |
| CN113909382A (en) * | 2021-08-31 | 2022-01-11 | 盐城诺焱科技有限公司 | Intelligent hardware compression mold suitable for high-end equipment manufacturing |
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| CN113909382B (en) * | 2021-08-31 | 2022-08-09 | 盐城诺焱科技有限公司 | Intelligent hardware compression mold suitable for high-end equipment manufacturing |
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| CN103386444B (en) | 2016-03-02 |
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