CN104438878A - High-pressure gas bulging thermoforming die of boron steel pipe - Google Patents
High-pressure gas bulging thermoforming die of boron steel pipe Download PDFInfo
- Publication number
- CN104438878A CN104438878A CN201410738413.XA CN201410738413A CN104438878A CN 104438878 A CN104438878 A CN 104438878A CN 201410738413 A CN201410738413 A CN 201410738413A CN 104438878 A CN104438878 A CN 104438878A
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- Prior art keywords
- steel pipe
- forming insert
- boron steel
- contour forming
- die
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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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/047—Mould construction
-
- 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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/049—Deforming bodies having a closed end
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Fluid Mechanics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention relates to a high-pressure gas bulging thermoforming die of a boron steel pipe. The die comprises an upper die base and a lower die base, and is characterized in that an upper die forming insert is mounted on the lower surface of the upper die base; a lower die forming insert is mounted on the upper surface of the lower die base; the lower surface of the upper die forming insert and the upper surface of the lower die forming insert are the forming surface of a workpiece of the boron steel pipe; seal heads are arranged at the two ends of the workpiece of the boron steel pipe respectively; the front ends of the seal heads are in contact with the pipe ends of the workpiece of the boron steel pipe; an axial hydraulic cylinder or an air cylinder is connected to the rear ends of the seal heads; vent holes are formed in the centers of the seal heads; the front ends of the vent holes are communicated with the interior of the workpiece of the boron steel pipe; a high-pressure gas station is connected to the rear ends of the vent holes; cooling passages are arranged at the lower part of the upper die forming insert and the upper part of the lower die forming insert respectively and directly connected with a water pipe or connected with the water pipe through the upper die base and the lower die base. According to the die, the workpiece which has the material mechanical strength of 1,500 MPa and is variable in cross-section shape and circumference can be produced.
Description
Technical field
The present invention relates to a kind of gases at high pressure bulging hot-forming die of boron steel steel pipe, under especially a kind of boron steel steel pipe high temperature, the mould of inner high voltage gas bulging and quenching technical, belongs to heat treatment plastic forming technology field.
Background technology
Boron steel steel pipe is as a series of hot forming steel pipe, and production technology is divided into shaping and 2 stages of quench cooled, wherein: shaping stage needs at high temperature to be shaped by mould punching; The quench cooled stage needs by controlling certain cooling velocity, the transformation from austenite microstructure to martensite microstructure can occur, obtain high intensity and hardness; Different according to boron steel kind, its intensity can reach 500 ~ 2000MPa.After common hot forming, to reach the boron steel chemical composition of 1500MPa as shown in table 1 for intensity.
Table 1
| 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 |
Pipe fitting internal high pressure forming technique, utilize the pressure that high-pressure fluid produces, fill and serve as punch at inside pipe fitting, the outside mould steel with shape of product serves as die, and experience feeds intake, mould is closed, priming fluid in pipe fitting, the axial pusher of pressurization, simultaneously axial liquid cylinder pressure is shaped and die sinking feeding several stage completes pipe fitting forming.Wherein, according to the needs of product and formability, process successively has intersection.
Pipe fitting internal high pressure forming technique, usually its front road will be combined with bend pipe and/or preforming process, before internal high pressure forming technique, obtain the part with final workpiece shapes size basic simlarity, avoid producing material folding in high-pressure forming mold closing course simultaneously, avoid in forming process, occurring cracking and the defect such as wrinkling.If above problem can be avoided, bend pipe and/or preforming process can be saved, directly carry out inner high voltage.For simple meter, bend pipe and/or preforming process the present invention no longer discuss in detail.
Current common pipe fitting forming technique is internal high pressure forming under normal temperature.Be limited to the restriction of tube-making process and material its own mechanical performance, the pipe fitting limited strength applied, tensile strength is difficult to more than 1000MPa.
Current common boron steel Steel Pipe Heat is shaped and mostly is ordinary hot Sheet Metal Forming Technology, and forming process is inner without high pressure medium, and can only adapt to the product of uiform section girth, shape of product is very limited.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of gases at high pressure bulging hot-forming die of boron steel steel pipe is provided, the workpiece that mechanical strength reaches 1500MPa, cross sectional shape and perimeter change can be produced.
According to technical scheme provided by the invention, the gases at high pressure bulging hot-forming die of described boron steel steel pipe, comprise upper bolster and die shoe, contour forming insert is installed at upper bolster lower surface, contour forming insert under die shoe upper surface is installed, the lower surface of upper contour forming insert and the upper surface of lower contour forming insert are the forming surface of boron steel steel pipe workpieces; It is characterized in that: at the two ends of described boron steel steel pipe workpieces, end socket is set respectively, the front end of end socket contacts with the pipe end of boron steel steel pipe workpieces, the rear end of end socket is connected with axial liquid cylinder pressure or cylinder, at the center of end socket, passage is set, the front end of passage is communicated with the inside of boron steel steel pipe workpieces, and the rear end of passage connects high pressure gas station; The bottom of contour forming insert and the top of lower contour forming insert arrange cooling channel respectively on described, and cooling channel directly or be connected with main cooling line with die shoe by upper bolster.
Further, described cooling channel adopts the mode of punching in upper contour forming insert and lower contour forming insert, aperture is 3 ~ 30mm, cooling channel in upper contour forming insert is apart from the lower surface 3 ~ 40mm of upper contour forming insert, and the cooling channel in lower contour forming insert is apart from the upper surface 3 ~ 40mm of lower contour forming insert.
Further, described cooling channel adopts and upper contour forming insert and lower contour forming insert is processed into upper and lower two parts respectively, forms the mode of cavity between upper and lower two parts; Described upper and lower two parts are connected by sealing machine, and upper and lower two-part shell thickness is 5 ~ 40mm.
Further, described cooling channel adopts cooling water and/or refrigerating gas and/or electrical heating elements as work-piece cools medium.
Further, at the cooling channel of described end socket inside arrangement cooling workpiece, the chilling temperature of this path is 3 ~ 650 DEG C.
Further, at the cooling channel of described end socket inside arrangement cooling workpiece, adopt cooling water and/or refrigerating gas and/or electrical heating elements as work-piece cools medium.
Further, the point diameter of described end socket is less than rear end diameter.
Compared with prior art, the present invention has the following advantages:
(1) the present invention can obtain the high tensile steel tube of intensity up to 1500MPa;
(2) the present invention makes full use of the shaping of gas inner high voltage inflation, can obtain the product of lateral cross section perimeter change.In prior art, utilize boron steel pipe fitting to carry out hot formed technique, what obtain is the product that section girth is constant mostly, limits the freedom of product design; The present invention allows in the scope of material property license, and freely change the section girth of product, the intensity making product reach different, rigidity, assembling and space requirement, the optimization for parts function provides larger space;
(3) the present invention at high temperature carries out gas expansion forming to workpiece, effectively can reduce the press forming power being shaped and needing.Along with the rising of temperature, the yield strength of boron steel material reduces rapidly, and percentage elongation improves, therefore, and internal high pressure forming technics comparing under normal temperature, press forming power greatly reduces.Reach equal or the part of similar intensity, compare with internal high pressure forming under normal temperature, press pressure needed for hot forming inflatable can be reduced to the 1/3 even lower of internal high pressure forming under normal temperature, the intensity of such as automobile DP1000 dual phase steel is 1000MPa, more much lower than the intensity 1500MPa of boron steel after hot forming, but the forcing press that under normal temperature, inner high voltage DP1000 steel tube place is equipped with is generally 5000 tons, and the forcing press that hot forming inflatable steel tube place is equipped with can be set to 1200 tons;
(4) the present invention is in quenching process, in pipe fitting, pass into gases at high pressure, effectively can regulate the quench cooling rate of boron steel.Because pipe fitting forming upper and lower mould is die, in the direct hot forming techniques of existing pipe fitting, do not have punch and can only try one's best in both sides to complete the function of punch with plug, so just do not have punch in the plug of the pipe fitting region that is beyond one's reach, the subsides mould of workpiece is very poor; Do not have enough pressure, heat cannot be transmitted to cooling medium fast---and on mould, the product obtained is difficult to meet design requirement in this field strength.The present invention utilizes gases at high pressure to serve as punch, and it is good that workpiece pastes mould, and can provide enough dwell pressures, thus obtain suitable cooling velocity, the product strength obtained all can meet the demands in arbitrary region;
(5) the present invention is direct hot forming quenching technical, without resilience after quenching., all there is the problem of resilience after component shaping in internal high pressure forming technique under existing pipe fitting normal temperature, mould usually will repeatedly die trial---machined---die trial, regulates springback compensation amount, reaches qualified size; The pressurize of heat forming technology quenching process, without resilience after the martensitic structure obtained.
Accompanying drawing explanation
Fig. 1 is the structural representation of the gases at high pressure bulging hot-forming die of boron steel steel pipe of the present invention.
Fig. 2 is the schematic diagram of cooling channel.
Sequence number in figure: upper contour forming insert 1, lower contour forming insert 2, boron steel steel pipe workpieces 3, cooling channel 5, end socket 6, passage 7.
Detailed description of the invention
Below in conjunction with concrete accompanying drawing, the invention will be further described.
As shown in Figure 1: the gases at high pressure bulging hot-forming die of boron steel steel pipe of the present invention comprises upper bolster and die shoe, upper bolster and die shoe are used for connecting mold and equipment, transmission and load bearing equipment are to boron steel steel pipe workpieces applied pressure simultaneously, the material of upper bolster and die shoe selects the foundry goods such as QT600, HT300, GM241, and the steel plate splicings such as 45# also can be selected to form; Contour forming insert 1 is installed at described upper bolster lower surface, contour forming insert 2 under die shoe upper surface is installed, the lower surface of upper contour forming insert 1 and the upper surface of lower contour forming insert 2 are the forming surface of boron steel steel pipe workpieces 3, on the top of the bottom of upper contour forming insert 1 and lower contour forming insert 2, cooling channel 5 is set respectively, cooled fast boron steel steel pipe workpieces 3 when being shaped pressurization by the cooling water in cooling channel 5, cooling channel 5 is direct or be connected with the water pipe of equipment with die shoe by upper bolster; At the two ends of described boron steel steel pipe workpieces 3, end socket 6 is set respectively, the front end of end socket 6 contacts with the pipe end of boron steel steel pipe workpieces 3, the rear end of end socket 6 is connected with axial liquid cylinder pressure or cylinder, the point diameter of end socket 6 is less than rear end diameter, at end socket 6 center at boron steel steel pipe workpieces 3 two ends, passage 7 is set respectively, the front end of passage 7 is communicated with the inside of boron steel steel pipe workpieces 3, and the rear end of passage 7 connects high pressure gas station;
As shown in Figure 1, described cooling channel 5 can adopt the mode of punching in upper contour forming insert 1 and lower contour forming insert 2, aperture is preferably 3 ~ 30mm, cooling channel 5 in upper contour forming insert 1 is apart from the lower surface 3 ~ 40mm of upper contour forming insert 1, and the cooling channel 5 in lower contour forming insert 2 is apart from the upper surface 3 ~ 40mm of lower contour forming insert 2;
Described cooling channel 5 also can adopt and upper contour forming insert 1 and lower contour forming insert 2 are processed into upper and lower two parts respectively, and form cavity between upper and lower two parts, upper and lower two parts are connected by sealing machine, and the cavity Cooling Water between upper and lower two parts passes through; Described upper and lower two-part shell thickness is preferably 5 ~ 40mm;
At described end socket 6 inside arrangement cooling water pipeline;
Material selection SKD61, the Cr7V of described upper contour forming insert 1 and lower contour forming insert 2,8407, the high-quality hot die steel such as Divar, QRO-90;
The material of described end socket 6 is consistent with upper contour forming insert 1 and lower contour forming insert 2.
Embodiment one: the inflatable heat forming technology of described boron steel steel pipe, the material of boron steel steel pipe: boron steel 22MnB5, expects thick 2.6mm, uiform section external diameter 100mm, length 850mm;
Above-mentioned workpiece specifically processes process by following steps:
1, boron steel straight tube is got the raw materials ready, and expects thick 2.6mm, external diameter 100mm, length 1000mm;
2, in heater, 900 DEG C are heated to by the complete austenitizing of boron steel pipe;
3, within 6 seconds, boron steel materials in the tube are placed in a mold, press initial openings height 800mm, and, shaping closed with the speed of 300mm/s;
4, the axial cylinder in mould both sides promotes its front-end end enclosure and seals pipe fitting, forms airtight cavity;
5, by mould end socket forward end gas path, be filled with gases at high pressure, pressure 25MPa in pipe fitting airtight cavity, press pressure 300 tons, part hot forming completes;
6, after hot forming completes, forcing press stays on and is reaching lower dead point position, is kept closed, and maintain the gas pressure intensity 15 seconds of the press pressure of 300 tons and 25MPa, part pressurize has been quenched;
7, take out workpiece, obtain the martensitic structure that intensity is 1500MPa;
8, radium-shine hot pressing bulging part two ends, obtain required size workpiece.
Claims (7)
1. the gases at high pressure bulging hot-forming die of a boron steel steel pipe, comprise upper bolster and die shoe, contour forming insert (1) is installed at upper bolster lower surface, contour forming insert (2) under die shoe upper surface is installed, the lower surface of upper contour forming insert (1) and the upper surface of lower contour forming insert (2) they are the forming surface of boron steel steel pipe workpieces (3); It is characterized in that: at the two ends of described boron steel steel pipe workpieces (3), end socket (6) is set respectively, the front end of end socket (6) contacts with the pipe end of boron steel steel pipe workpieces (3), the rear end of end socket (6) is connected with axial liquid cylinder pressure or cylinder, at the center of end socket (6), passage (7) is set, the front end of passage (7) is communicated with the inside of boron steel steel pipe workpieces (3), and the rear end of passage (7) connects high pressure gas station; The bottom of contour forming insert (1) and the top of lower contour forming insert (2) arrange cooling channel (5) respectively on described, and cooling channel (5) directly or be connected with main cooling line with die shoe by upper bolster.
2. the gases at high pressure bulging hot-forming die of boron steel steel pipe as claimed in claim 1, it is characterized in that: described cooling channel (5) adopts the mode upper contour forming insert (1) and the upper punching of lower contour forming insert (2), aperture is 3 ~ 30mm, cooling channel (5) on upper contour forming insert (1) is apart from the lower surface 3 ~ 40mm of upper contour forming insert (1), and the cooling channel (5) on lower contour forming insert (2) is apart from the upper surface 3 ~ 40mm of lower contour forming insert (2).
3. the gases at high pressure bulging hot-forming die of boron steel steel pipe as claimed in claim 1, it is characterized in that: described cooling channel (5) adopts and upper contour forming insert (1) and lower contour forming insert (2) are processed into upper and lower two parts respectively, forms the mode of cavity between upper and lower two parts; Described upper and lower two parts are connected by sealing machine, and upper and lower two-part shell thickness is 5 ~ 40mm.
4. the gases at high pressure bulging hot-forming die of boron steel steel pipe as claimed in claim 1, is characterized in that: described cooling channel (5) adopts cooling water and/or refrigerating gas and/or electrical heating elements as work-piece cools medium.
5. the gases at high pressure bulging hot-forming die of boron steel steel pipe as claimed in claim 1, is characterized in that: at the cooling channel of described end socket (6) inside arrangement cooling workpiece, the chilling temperature of this path is 3 ~ 650 DEG C.
6. the gases at high pressure bulging hot-forming die of boron steel steel pipe as claimed in claim 1, it is characterized in that: at the cooling channel of described end socket (6) inside arrangement cooling workpiece, adopt cooling water and/or refrigerating gas and/or electrical heating elements as work-piece cools medium.
7. the gases at high pressure bulging hot-forming die of boron steel steel pipe as claimed in claim 1, is characterized in that: the point diameter of described end socket (6) is less than rear end diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410738413.XA CN104438878A (en) | 2014-12-08 | 2014-12-08 | High-pressure gas bulging thermoforming die of boron steel pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410738413.XA CN104438878A (en) | 2014-12-08 | 2014-12-08 | High-pressure gas bulging thermoforming die of boron steel pipe |
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| CN201410738413.XA Pending CN104438878A (en) | 2014-12-08 | 2014-12-08 | High-pressure gas bulging thermoforming die of boron steel pipe |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105268820A (en) * | 2015-06-19 | 2016-01-27 | 新昌县航达机械制造有限公司 | Large-caliber hydraulically-controlled type tee joint pipe buckle type rigid and plastic composite bulging forming device |
| CN106623580A (en) * | 2017-01-10 | 2017-05-10 | 哈尔滨宇航精创科技有限公司 | Method for manufacturing bathroom water faucet branch pipe by compounding hot extrusion with superplastic bulging |
| CN108372226A (en) * | 2016-12-21 | 2018-08-07 | 中国航空制造技术研究院 | Gas pressure compacting tooling and method of the inside with muscle cylinder |
| CN110465575A (en) * | 2019-09-10 | 2019-11-19 | 哈尔滨工业大学 | A kind of heat treatment of thin-wall workpiece and gas pressure compacting integral method |
| CN111715765A (en) * | 2020-06-15 | 2020-09-29 | 大连理工大学 | Quick internal pressure bulging equipment for pipes |
| CN114273513A (en) * | 2020-09-27 | 2022-04-05 | 宝山钢铁股份有限公司 | Device for manufacturing torsion beam with closed section and manufacturing method thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105268820A (en) * | 2015-06-19 | 2016-01-27 | 新昌县航达机械制造有限公司 | Large-caliber hydraulically-controlled type tee joint pipe buckle type rigid and plastic composite bulging forming device |
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| CN108372226B (en) * | 2016-12-21 | 2020-11-10 | 中国航空制造技术研究院 | Air pressure forming tool and method for internally ribbed cylinder |
| CN106623580A (en) * | 2017-01-10 | 2017-05-10 | 哈尔滨宇航精创科技有限公司 | Method for manufacturing bathroom water faucet branch pipe by compounding hot extrusion with superplastic bulging |
| CN106623580B (en) * | 2017-01-10 | 2018-06-01 | 哈尔滨宇航精创科技有限公司 | A kind of hot extrusion and the method for expansive forming composite manufacturing bathroom faucet branch pipe |
| CN110465575A (en) * | 2019-09-10 | 2019-11-19 | 哈尔滨工业大学 | A kind of heat treatment of thin-wall workpiece and gas pressure compacting integral method |
| CN110465575B (en) * | 2019-09-10 | 2021-01-29 | 哈尔滨工业大学 | Titanium alloy thin-wall part heat treatment and air pressure forming integrated method |
| CN111715765A (en) * | 2020-06-15 | 2020-09-29 | 大连理工大学 | Quick internal pressure bulging equipment for pipes |
| CN114273513A (en) * | 2020-09-27 | 2022-04-05 | 宝山钢铁股份有限公司 | Device for manufacturing torsion beam with closed section and manufacturing method thereof |
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Application publication date: 20150325 |
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