CN103350147A - Cooling gas direct-cooling process and device of hot forming die based on boron steel tube - Google Patents
Cooling gas direct-cooling process and device of hot forming die based on boron steel tube Download PDFInfo
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Abstract
The invention belongs to the technical field of heat treatment plastic forming, and discloses a cooling gas direct-cooling process and device of a hot forming die based on a boron steel tube. According to the method, the corresponding position in the hot forming die can be divided into a convex angle area, a concave angle area and a plane area placed in an upper die and a concave angle area and a plane area placed in a lower die according to each circular arc part apart from linear portions in the geometrical characteristic of the cross section of a product to be shaped; then, the boron steel tube is heated in heating equipment until Austenitizing is reached, the boron steel tube is placed in the hot forming die, and forming processing is conducted on the boron steel tube under the effect of a press machine within the range of 450-850 DEG C; finally, the closed state of the hot forming die is maintained, meanwhile, cooling gas is conveyed into half-opened cooling air passages, so that the cooling gas in the half-opened cooling air passages flows and cools a workpiece directly, and the cooling gas is directly injected into the atmosphere or is recycled through a cooling gas loop ultimately. The cooling gas direct-cooling process and device of the hot forming die based on the boron steel tube not only can make the workpiece be formed smoothly through the way of die stamping in a forming stage, but also can directly cool the workpiece by the cooling gas in a pressure maintaining cooling stage.
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 refrigerating gas and device of the hot-forming die based on the boron steel steel pipe.
Background technology
The boron steel steel pipe is as a series of hot forming steel pipes, and production technology is divided into shaping and 2 stages of quench cooled as shown in Figure 1, and wherein: shaping stage needs at high temperature be shaped by mould punching; Transformation from from the austenite microstructure to the martensite microstructure need to can occur by the certain cooling velocity of control in the quench cooled stage, and obtain high intensity and hardness: different according to the boron steel kind, its intensity can reach 500～2000MPa.Intensity reaches the boron steel chemical composition of 1500MPa and is after the common hot forming:
| ? | 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 is to arrange the chilled(cooling) water return (CWR) at mould inside at present.Be the boron steel workpiece under the high temperature, enter the pressurize cooling stage after being shaped by mould punching, at first with heat transferred mould steel, mould steel is arranged in heat transferred cooling water wherein again, thereby realizes the cooling to the boron steel workpiece; The cooling effectiveness of this mode workpiece not only depends on arranging of cooling water channel, is subject to simultaneously the heat transfer efficiency of mould steel, belongs to the hot forming processing technology that cooling fluid is cooled off workpiece indirectly.
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 that the hardenability element adds 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 that the steel pipe of above-mentioned heating is carried out the hot-forming hot-forming step that is shaped to the shape of the horizontal part that possesses planar portions in both sides; And the cooling step that the horizontal part of institute's moulding under the state of the above-mentioned extrusion die of closure is cooled off fast.But this technology enters the pressurize cooling stage after being shaped by mould punching, at first with heat transferred mould steel, mould steel is arranged in heat transferred cooling water wherein again, thereby realizes the cooling to the boron steel workpiece; The cooling effectiveness of this mode workpiece not only depends on arranging of chilled(cooling) water return (CWR), is subject to simultaneously the heat transfer efficiency of mould steel, belongs to the hot forming processing technology that cooling fluid is cooled off workpiece indirectly.
Summary of the invention
The present invention is directed to the prior art above shortcomings, a kind of direct-cooled technique of refrigerating gas and device of the hot-forming die based on the boron steel steel pipe are proposed, both can by mould punching workpiece be shaped smoothly at shaping stage, can realize that refrigerating gas directly cooled off workpiece 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 refrigerating gas of the hot-forming die based on the boron steel steel pipe, may further comprise the steps:
The first step, geometric properties according to product section to be formed, position corresponding in the hot forming tool is divided into the salient angle zone that is arranged in patrix, re-entrant angle zone and plane domain and the re-entrant angle zone and the plane domain that are arranged in counterdie, wherein: the profile in salient angle zone is set to and the identical shape of finished product profile, and on the surface of the plane domain of upper die and lower die and the cambered surface in re-entrant angle zone some the semi-open cooling airway that are interconnected being set respectively, the head end of this semi-open cooling airway is connected to form cooling air circuit with the refrigerating gas interface of hot forming tool respectively with terminal.
Second step, shaping stage: the boron steel steel pipe is heated in heater after the austenitizing, places hot forming tool and form processing by the forcing press effect in 450～850 ℃ scope.
The temperature of described austenitizing is 850～950 ℃.
Described connection refers to: the semi-open cooling airway that is arranged in part of the upper die and part of the lower die is communicated with respectively and consists of respectively one or several entrance and exit, and described entrance and exit is connected with entrance with the outlet of forcing press respectively.
The 3rd step, pressurize cooling stage: in semi-open cooling airway, input refrigerating gas when keeping the hot forming tool closure, the interior refrigerating gas of semi-open cooling airway is flowed also directly workpiece is cooled off, refrigerating gas finally directly enters atmosphere by cooling air circuit or circulation is reclaimed.
Described refrigerating gas is normal temperature or low temperature compression air, compressed nitrogen or compression arbon dioxide; Described refrigerating gas to the cooling velocity of workpiece more than or equal to 50 ℃/second.
The cambered surface setting in described re-entrant angle zone refers to: according to the size of the arc radius in product section re-entrant angle to be formed zone, the position of the direction biasing 0～L-3(mm) that reduces to arc radius arranges semi-open cooling airway, and wherein: L is the arc length in re-entrant angle zone.
The present invention relates to realize the device of above-mentioned technique, comprising: with salient angle zone, re-entrant angle is regional and the patrix of plane domain, with the counterdie of re-entrant angle zone and plane domain and be arranged at respectively the cambered surface of upper die and lower die concave angular zone and some the semi-open cooling airway on the surface of plane domain.
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 the cooling gas passage in mould re-entrant angle zone, neither affect the shaping of workpiece, can realize that again refrigerating gas and the direct of workpiece contact, thereby realize being shaped, cool off and once finish.
2) the present invention is integrated into a station realization with component shaping and the direct Cooling Quenching of refrigerating gas.In the prior art, the technique of using refrigerating gas, wet goods refrigerating gas directly to cool off the boron steel steel pipe workpieces is arranged, but must after component shaping, beyond forming station, increase a station and be equipped with different operating modes, frock and equipment and realize.
3) refrigerating gas directly cools off workpiece, and cooling effectiveness is high.In the prior art, there is the mould steel that uses the internal placement cooling water indirectly to cool off workpiece, can realize that component shaping and Cooling Quenching finish at a station, but cooling water can not directly cool off workpiece, heat conducts by mould steel, the efficient of cooling is not the efficiency of supply that depends on cooling water usually, but depends on the heat transfer efficiency of mould steel.Use this technique, can the Effective Raise cooling effectiveness.
The hollow area cooling.Particularly for cast spare, some zone is for the needs of product, and inside is hollow (punch-die is contactless up and down), at this moment just can't apply packing pressure between the indirect cooling technology punch-die of traditional mould steel, thereby can't the effective cooling workpiece.Use technology of the present invention, under, the hollow state without packing pressure contactless at punch-die, equally can supply with refrigerating gas, workpiece is carried out effective cooling.
4) the present invention can be used with the indirect cooling technology that the existing mold steel cools off workpiece indirectly.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, even the cooling dead angle occurs;
Ii) product is laser assembly solder plate (Tailored Welded Blank), and materials in the tube itself are formed by the plate with laser welding pipe crimping of two or more different-thickness.Zones of different is because thickness is different, and the tradition indirectly method cooling effectiveness of cooling is difficult to accomplish consistent with other zones;
Iii) product is not for waiting material slab (Tailored Rolled Blank), and tubing itself is rolled into the steel pipe of two or more different-thickness by special cold-rolling process.The zones of different zone is because thickness is different, and the tradition indirectly method cooling effectiveness of cooling is difficult to accomplish consistent with other zones;
In the above situation, according to actual needs, zones of different can freely select refrigerating gas directly to cool off or refrigerating gas directly cools off in conjunction with indirectly cooling, and is mutually additional, reaches even cooling, the purpose of enhancing productivity simultaneously.
Description of drawings
Fig. 1 is existing hot forming technology schematic diagram;
Among the figure: a is for adding post forming; B is by the pressurize quench cooled.
Fig. 2 is mould structure sectional schematic diagram of the present invention;
Among the figure: patrix 1, salient angle zone 2, the semi-open cooling airway 3 that is arranged at the re-entrant angle zone, the semi-open cooling airway 4 that is arranged at plane domain, counterdie 5, product workpiece 6, sealing cooling airway 7.
Fig. 3 is semi-open cooling airway schematic diagram among the embodiment.
The specific embodiment
The below elaborates to embodiments of the invention, and 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, present embodiment comprises: patrix 1, counterdie 5 and be arranged at respectively patrix 1 and some the semi-open cooling airway 3,4 on counterdie 5 surfaces.Semi-open cooling airway is unified to be the D6 semi-circular recesses, and the groove center distance is unified to be 12mm.Forcing press is 150T thermoforming special pressure machine, and 4 groups of common industrial air cooling sources of the gas are provided, and every group initial temperature is-18 ℃, and flow is 1000g/ minute, and rated power is 7.5KW.
Workpiece is the thick boron steel steel pipe of 1.5mm, and length 100mm, steel pipe caliber are D50mm, and the corner fillet is R6, i.e. arc length 37.68mm.
As shown in Figure 2, in the hot forming process, because the existence in salient angle zone 2 can guarantee that workpiece is shaped according to product design; The pressurize cooling stage, the serial cooling airway 3 of arranging, 4 supply refrigerating gases directly cool off workpiece; For further optimizing cooling effect, the sealing cooling airway 7 of traditional indirect cooling is set in the salient angle zone 2 of patrix 1.
Above-mentioned building mortion carries out concrete heat treatment by following steps:
1, the boron steel materials in the tube are got the raw materials ready
2, in heater, be heated to 900 ℃ with the plate complete austenitizing
3, within 6 seconds, the boron steel materials in the tube are placed in the 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-18 ℃ of cooling-airs with 4*1000g/Min simultaneously, directly workpiece is cooled off 5 seconds fast, and the intensity that finally need to obtain is the martensitic structure of 1500MPa.
Embodiment 2
As shown in Figure 2, present embodiment comprises: patrix 1, counterdie 5 and be arranged at respectively patrix 1 and some the semi-open cooling airway 3,4 on counterdie 5 surfaces.Semi-open cooling airway is unified to be the D6 semi-circular recesses, and the groove center distance is unified to be 12mm.Forcing press is 150T thermoforming special pressure machine, and 8 groups of common industrial air cooling sources of the gas are provided, and every group initial temperature is-18 ℃, and flow is 1000g/ minute, and rated power is 7.5KW.
Workpiece is the thick boron steel steel pipe of 1.5mm, and length 200mm, steel pipe caliber are D50mm, and the corner fillet is R6, i.e. arc length 37.68mm.
As shown in Figure 2, for further optimizing cooling effect, the sealing cooling airway 7 of traditional indirect cooling is set in the salient angle zone 2 of patrix 1.
As shown in Figure 3, calculate required refrigerating gas road flow for satisfying, semi-open cooling airway can have different cross sections as required, both can be that (Fig. 3 a) for the circular groove structure, also can be inverted trapezoidal (Fig. 3 b) or rectangular recess (Fig. 3 c) structure, can also be circular arc and rectangle or trapezoidal combining structure (Fig. 3 d), do appropriateness adjustment according to the variation of product, the needs of cooling, the convenience of processing and manufacturing etc. fully.
Above-mentioned building mortion carries out concrete heat treatment by following steps:
1, the boron steel materials in the tube are got the raw materials ready
2, in heater, be heated to 900 ℃ with the plate complete austenitizing
3, within 6 seconds, the boron steel materials in the tube are placed in the 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-18 ℃ of cooling-airs with 4*1000g/Min simultaneously, directly workpiece is cooled off 5 seconds fast, and the intensity that finally need to obtain is the martensitic structure of 1500MPa.
As shown in Figure 2, present embodiment comprises: patrix 1, counterdie 5 and be arranged at respectively patrix 1 and some the semi-open cooling airway 3,4 on counterdie 5 surfaces.Semi-open cooling airway is unified to be wide, the dark rectangular recess of 9mm of 3mm, and flute pitch is unified to be 12mm.Forcing press is 150T thermoforming special pressure machine, and 6 groups of common industrial air cooling sources of the gas are provided, and every group initial temperature is-18 ℃, and flow is 1000g/ minute, and rated power is 7.5KW.
Workpiece is the thick boron steel steel pipe of 2.5mm, and length 1000mm, steel pipe caliber are D50mm, and the corner fillet is R6, i.e. arc length 37.68mm.
As shown in Figure 2, for further optimizing cooling effect, the sealing cooling airway 7 of traditional indirect cooling is set in the salient angle zone 2 of patrix 1.
Above-mentioned building mortion carries out concrete heat treatment by following steps:
1, the boron steel materials in the tube are got the raw materials ready
2, in heater, be heated to 900 ℃ with the plate complete austenitizing
3, within 6 seconds, the boron steel materials in the tube are placed in the 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-18 ℃ of cooling-airs with 6*1000g/Min simultaneously, directly workpiece is cooled off 5 seconds fast, and the intensity that finally need to obtain is the martensitic structure of 1500MPa.
Claims (8)
1. the direct-cooled technique of the refrigerating gas based on the hot-forming die of boron steel steel pipe is characterized in that, may further comprise the steps:
The first step, geometric properties according to product section to be formed, position corresponding in the hot forming tool is divided into the salient angle zone that is arranged in patrix, re-entrant angle zone and plane domain and the re-entrant angle zone and the plane domain that are arranged in counterdie, wherein: the profile in salient angle zone is set to and the identical shape of finished product profile, and on the surface of the plane domain of upper die and lower die and the cambered surface in re-entrant angle zone some the semi-open cooling airway that are interconnected being set respectively, the head end of this semi-open cooling airway is connected to form cooling air circuit with the refrigerating gas interface of hot forming tool respectively with terminal;
Second step, shaping stage: the boron steel steel pipe is heated in heater after the austenitizing, places hot forming tool and form processing by the forcing press effect in 450～850 ℃ scope;
The 3rd step, pressurize cooling stage: in semi-open cooling airway, input refrigerating gas when keeping the hot forming tool closure, the interior refrigerating gas of semi-open cooling airway is flowed also directly workpiece is cooled off, refrigerating gas finally directly enters atmosphere by cooling air circuit or circulation is reclaimed.
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, the cambered surface setting in described re-entrant angle zone refers to: according to the size of the arc radius in product section re-entrant angle to be formed zone, the position of the direction biasing 0～L-3(mm) that reduces to arc radius arranges semi-open cooling airway, and wherein: L is the arc length in re-entrant angle zone.
4. technique according to claim 1, it is characterized in that, described connection refers to: the semi-open cooling airway that is arranged in part of the upper die and part of the lower die is communicated with respectively and consists of respectively one or several entrance and exit, and described entrance and exit is connected with entrance with the outlet of forcing press respectively.
5. technique according to claim 1 is characterized in that, described refrigerating gas is normal temperature or low temperature compression air, compressed nitrogen or compression arbon dioxide; Described refrigerating gas to the cooling velocity of workpiece more than or equal to 50 ℃/second.
6. device of realizing arbitrary above-mentioned technique among the claim 1-5, it is characterized in that, comprising: heater, parts transferring apparatus, forcing press, with the salient angle zone, re-entrant angle is regional and the patrix of plane domain, with the counterdie of re-entrant angle zone and plane domain, be arranged at some semi-open cooling airway on surface of the cambered surface of upper die and lower die concave angular zone and plane domain and the refrigerating gas feedway that forcing press provides for mould respectively.
7. device according to claim 6 is characterized in that, described patrix inside is provided with the sealing cooling airway.
8. device according to claim 6 is characterized in that, the cross section of described semi-open cooling airway is circular groove structure, inverted trapezoidal groove structure, rectangular recess structure or its combination.
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| CN201310315224.7A CN103350147B (en) | 2013-07-24 | 2013-07-24 | The direct-cooled technique of refrigerating gas based on the hot-forming die of boron steel steel pipe and device |
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| CN201310315224.7A CN103350147B (en) | 2013-07-24 | 2013-07-24 | The direct-cooled technique of refrigerating gas based on the hot-forming die of boron steel steel pipe and device |
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| CN103350147B CN103350147B (en) | 2015-12-23 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103785734A (en) * | 2014-01-28 | 2014-05-14 | 无锡红弦汽车轻量化科技有限公司 | Pressure cooling process of segmented reinforcing type parts of hot forming steel pipe, and die hydraulic device |
| CN106944735A (en) * | 2017-03-29 | 2017-07-14 | 广东文达镁业科技股份有限公司 | A kind of diffusion in vacuum welding mould |
| CN113334314A (en) * | 2021-06-23 | 2021-09-03 | 中国船舶重工集团公司第七0七研究所 | Press fitting tool and press fitting method for peek ring |
| 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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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103785734A (en) * | 2014-01-28 | 2014-05-14 | 无锡红弦汽车轻量化科技有限公司 | Pressure cooling process of segmented reinforcing type parts of hot forming steel pipe, and die hydraulic device |
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| CN113334314A (en) * | 2021-06-23 | 2021-09-03 | 中国船舶重工集团公司第七0七研究所 | Press fitting tool and press fitting method for peek ring |
| 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 |
| 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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