CN105537342A - Numerical control differential heating bending forming mould for titanium tube and method - Google Patents
Numerical control differential heating bending forming mould for titanium tube and method Download PDFInfo
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- CN105537342A CN105537342A CN201610034129.3A CN201610034129A CN105537342A CN 105537342 A CN105537342 A CN 105537342A CN 201610034129 A CN201610034129 A CN 201610034129A CN 105537342 A CN105537342 A CN 105537342A
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- mould
- bending die
- bending
- wrinkling
- thermal insulation
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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
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/16—Auxiliary equipment, e.g. machines for filling tubes with sand
- B21D9/18—Auxiliary equipment, e.g. machines for filling tubes with sand for heating or cooling of bends
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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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/18—Lubricating, e.g. lubricating tool and workpiece simultaneously
-
- 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
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/01—Bending tubes using mandrels or the like the mandrel being flexible and engaging the entire tube length
- B21D9/03—Bending tubes using mandrels or the like the mandrel being flexible and engaging the entire tube length and built-up from loose elements, e.g. series of balls
-
- 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
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/08—Bending tubes using mandrels or the like in press brakes or between rams and anvils or abutments; Pliers with forming dies
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention discloses a numerical control differential heating bending forming mould for a titanium tube and a method. The numerical control differential heating bending forming mould for the titanium tube is characterized in that heating holes and thermometer holes are formed in a pressure mould, a bending mould, a mandril and a crease-resistant mould respectively; and thermometer holes are formed in a clamping mould and an insert block; the pressure mould, the mandril, the bending mould and the crease-resistant mould are heated, and the heating temperatures are set according to tube hot bending simulated reasonable temperature distribution. Compared with the prior art, the moulds and the tube can be heated to the set temperatures faster, the heating efficiency of the tube is improved, temperature nonuniformity is avoided, the bending forming quality and forming limit of a titanium alloy tube are further improved and increased, and a machine tool is protected by a heat insulating plate. After the tube is bent within the forming limit, the inner side of the tube does not crease, the surface of the tube has no scratch, a reduction rate of the wall thickness of the outer side of the tube is less than 17%, and a section flattening rate of the tube is less than 5.0%, so that the requirements of an airplane on a small-bending-radius elbow tube made of major-diameter thin-wall pure titanium tube can be met.
Description
Technical field
The present invention relates to tubing digital control processing molding field, specifically a kind of for titanium pipe numerical control differential heating bending forming method and mould.
Background technology
The one that numerical controlled bending of pipe technique is traditional bent tube technique combining with digital control technology and produces advanced pipe fitting bending forming technology, the requirement of elbow member to high accuracy, high efficiency and Digital manufacturing can be met, occupy critical role in high-tech areas such as Aeronautics and Astronautics and illustrate wide application prospect.Titanium alloy elbow member quality is light also can bear higher operating pressure, is applied to the pipe-line system such as fuel oil, air-conditioning, can meet the active demand of Advanced Aircraft development to aspects such as high-performance, lightweight and high effects.But, due to titanium alloy material poor fluidity, plastic deformation shows strong anisotropy and tension and compression asymmetry often, make very easily to occur in tubing room temperature numerical-control bending process to break, wrinkling, the problem such as wall thickness excessive thinning, the excessive fasciation in cross section, elbow member yield rate is low, the bending forming of long radius (radius of curvature R/pipe diameter D > 2) can only be carried out, aircraft cannot be met and save the requirement that conduit takes up space as far as possible, become the bottleneck that restriction titanium pipe bending forming quality/forming limit improves.Major part titanium alloy tube is heated to after in uniform temperature interval has good plasticity and percentage elongation, and resistance of deformation significantly declines, and therefore numerical-control heating bends is a kind of effective way improving titanium pipe bending forming quality/forming limit.
By retrieval domestic and foreign literature and patent, find: the introduction having had titanium alloy tube numerical-control heating bending forming method and shaping dies at present.Be the utility model of CN201127971Y and publication number at Authorization Notice No. be in the innovation and creation of CN101185949A, propose a kind of numerical control pipe bender die for hot bending and a kind of method utilizing CNC tube bending machine to carry out heated constant temperature bend pipe, this mould bending die short transverse have through hole as bottoming hole, have a blind hole in plug Center Length direction and have through hole and have blind hole as bottoming hole as on bottoming hole, anti-wrinkling mould length direction as bottoming hole, pressure mould length direction, for carrying out heated constant temperature bend pipe; When bending for the difficult forming tube of diameter D < 40mm or thick-wall tube (pipe diameter D/ wall thickness t < 20) numerical-control heating, good bending forming effect can be obtained.But as pipe diameter D > 40mm, because mould volume is large, the energy-output ratio of thermal bending mould is large, and the heat transfer between bending die and lathe easily affects the serviceability of lathe, reduces the service life of lathe; Simultaneously because pressure mould length is longer, offer through hole difficulty at pressure mould length direction, and the single hole heat time is longer.Do not relate to titanium pipe numerical-control bending lubrication, temperature controlling range in these innovation and creation, be difficult to the numerical-control heating bending forming carrying out diameter D > 40mm titanium pipe.Be propose a kind of large-diameter thin-wall pure titanium tube numerical-control heating bending die and manufacturing process in the invention of CN102527848B at Authorization Notice No., this mould is being evenly equipped with multiple pressure mould bottoming hole, on the end face of plug, is being uniformly distributed with multiple plug bottoming hole along the circumference, for heating bend along the length direction of pressure mould.For large-diameter thin-wall pure titanium tube numerical control heat o ing, the too much energy resource consumption that heated at constant temperature pipe fitting brings can be reduced, improve pipe fitting simultaneously and bend yield rate.But this die design method is mainly for pure titanium pipe, and operating temperature is 200 ~ 300 DEG C, the numerical-control heating bending forming of difficult forming titanium alloy pipe under being difficult to carry out higher temperature.Simultaneously, because " heat sink fall " effect of bending die and plug are to the heat transfer of core ball portion, the temperature of plug front end is lower, makes the distribution of bending pipes regional temperature and the distribution of hot bending reasonable temperature occur difference, is unfavorable for improving titanium pipe bending forming quality/forming limit.
Summary of the invention
Carrying out the deficiency of titanium pipe numerical-control heating bending forming in order to overcome prior art, improving titanium pipe numerical control bending forming quality and forming limit, the present invention proposes a kind of titanium pipe numerical control differential heating bending die and method.
Described titanium pipe numerical control differential heating bending die comprises pressure mould, clamp mode, insert, bending die, anti-wrinkling mould, core and thermal insulation board.Described core comprises plug and core ball; Described thermal insulation board comprises pressure mould thermal insulation board, clamp mode thermal insulation board, bending die thermal insulation board and anti-wrinkling mould thermal insulation board; Pressure mould, bending die, plug and anti-wrinkling mould there are bottoming hole and thermometer hole respectively, clamp mode and insert have thermometer hole.Described pressure mould thermal insulation board, clamp mode thermal insulation board, bending die thermal insulation board and anti-wrinkling mould thermal insulation board increase Cooling Holes.
At the upper surface of bending die, from bending die and anti-wrinkling mould cooperation position, be evenly equipped with multiple bending die bottoming hole and bending die thermometer hole along bending die circumferencial direction, and each bending die thermometer hole is between adjacent bending die bottoming hole; The quantity of described bending die bottoming hole and bending die thermometer hole is determined by following formula:
In formula: n
bhfor the quantity of bending die bottoming hole, n
btfor the quantity of bending die thermometer hole, C
bfor the specific heat capacity of bending die material, m
bfor the quality of bending die, △ T is the temperature that bending die raises, W
bfor the power of single bending die heating rod, t
bfor the heat time of bending die; The aperture of described bending die bottoming hole with use the diameter of heating rod to match; The aperture of described bending die thermometer hole and the diameter of institute's use thermocouple match.
At the upper surface of described anti-wrinkling mould, the length direction along this anti-wrinkling mould is evenly equipped with multiple anti-wrinkling mould bottoming hole, and there is anti-wrinkling mould thermometer hole at the half place being equivalent to the spacing of two adjacent anti-wrinkling mould bottoming holes before each anti-wrinkling mould bottoming hole; The quantity of anti-wrinkling mould bottoming hole and anti-wrinkling mould thermometer hole is determined according to following formula:
In formula: n
whfor the quantity of anti-wrinkling mould bottoming hole, n
wtfor the quantity of anti-wrinkling mould thermometer hole, C
wfor the specific heat capacity of anti-wrinkling mould material, m
wfor the quality of anti-wrinkling mould, △ T is the temperature raised, W
wfor the power of single anti-wrinkling mould heating rod, t
wfor the heat time of anti-wrinkling mould;
The upper surface of described clamp mode, is evenly equipped with multiple clamp mode thermometer hole along its length; The upper surface of described insert, is evenly equipped with multiple insert thermometer hole along its length; Described clamp mode thermometer hole and insert thermometer hole are blind hole;
Pressure mould thermal insulation board is between pressure mould and lathe; Clamp mode thermal insulation board is between clamp mode and lathe; Bending die thermal insulation board is between bending die and lathe and be arranged on the central shaft of bending die; Anti-wrinkling mould thermal insulation board is between anti-wrinkling mould and lathe; The surface of described each thermal insulation board and each contacting dies is zigzag, and has spacing between each thermal insulation board and each mould, defines air blanketing; Asbestos pad is had in described air blanketing; The one side that described pressure mould, clamp mode contact with thermal insulation board with anti-wrinkling mould has rectangular channel, reaches location and fixing object by being embedded in rectangular channel by the sawtooth on pressure mould thermal insulation board, clamp mode thermal insulation board, anti-wrinkling mould thermal insulation board; The upper surface of described pressure mould, anti-wrinkling mould upper surface, bending die upper surface, insert upper surface, and the upper surface of clamp mode all spreads and is covered with asbestos pad.
Described pressure mould thermal insulation board is distributed with 2 Cooling Holes communicated along its short transverse; Clamp mode thermal insulation board is distributed with 2 Cooling Holes communicated along its short transverse; Anti-wrinkling mould thermal insulation board is distributed with 2 separate Cooling Holes along its length; Bending die thermal insulation board is distributed with 6 separate Cooling Holes along its length.
The detailed process of described die forming titanium pipe that utilizes that the present invention proposes is:
The first step, mould and bending machine heat insulation.By mould and bending machine heat insulation time, pressure mould thermal insulation board is laid between the fitting surface and lathe joint face of pressure mould, anti-wrinkling mould thermal insulation board is laid between anti-wrinkling mould and lathe joint face, between bending die fitting surface and lathe joint face, lay bending die thermal insulation board, between the fitting surface and lathe joint face of clamp mode, lay clamp mode thermal insulation board; At the upper surface of pressure mould, and the upper surface of the upper surface of clamp mode, the upper surface of insert, the upper surface of bending die and anti-wrinkling mould all spreads and is covered with asbestos.
Second step, assemblage and adjustment mould.
3rd step, bending machine rate of bending and bending time pressure mould boosting speed setting.
The rate of bending of setting bending machine is 0.05 ~ 5 °/s;
The boosting speed of pressure mould when setting is bending: when the boosting speed of pressure mould bends with pipe fitting, the linear velocity of this pipe fitting axis is identical, the setting of pressure mould boosting speed when completing bending.
Set rear closedown bending machine.
4th step, the setting of pipe fitting angle of bend.According to pipe fitting forming requirement, pipe fitting angle of bend is 0 ° ~ 185 °;
5th step, the lubrication of mould and pipe fitting.The high temperature resistant solid lubrication cream of even application one deck on anti-wrinkling mould, plug and core ball.
6th step, the installation of heating and attemperating unit.Placement force mould heating rod in pressure mould bottoming hole, bending die heating rod is placed in bending die bottoming hole, plug heating rod is placed in plug bottoming hole, in anti-wrinkling mould bottoming hole, place anti-wrinkling mould heating rod, and place thermocouple respectively in described each pressure mould thermometer hole, each bending die thermometer hole each plug thermometer hole, each clamp mode thermometer hole, each insert thermometer hole and each anti-wrinkling mould thermometer hole.The wire of the wire of described pressure mould heating rod, plug heating rod, the wire of bending die heating rod are connected with the control port of temperature controller respectively with the wire of anti-wrinkling mould heating rod.The wire of described each thermocouple is connected with the measurement port of temperature controller respectively.
7th step, setting heating-up temperature; Described heating-up temperature comprises the heating-up temperature T of pressure mould
1, plug heating-up temperature T
2, bending die heating-up temperature T
4with the heating-up temperature T of anti-wrinkling mould
3:
The heating-up temperature of setting plug heating-up temperature and pressure mould is 200 ~ 450 DEG C; Anti-wrinkling mould heating-up temperature is 180 ~ 400 DEG C, and the heating-up temperature of bending die is 180 ~ 300 DEG C.
T during concrete heating
1>=T
2>=T
3; When the radius of curvature R of pipe fitting reduces, T
1-T
3value should increase.
When the heating-up temperature set is greater than 300 DEG C, Cooling Holes in each thermal insulation board is connected with cooling water circulating device by water pipe, to lower the temperature to lathe.
8th step, pipe fitting bends.Open bending machine lathe, pressure mould, clamp mode, insert, bending die, anti-wrinkling mould, core and pipe fitting are assembled; By heating rod to pressure mould, plug, bending die and anti-wrinkling mould be heated to set temperature value and be incubated 30 ~ 90s.Heat rear operation bending machine, according to the rate of bending 3 °/s of setting, 180 ° have been bent to pipe fitting, obtain the pipe fitting after bending forming.
9th step, unloading.
The titanium pipe numerical control differential heating bending die that the present invention proposes, comprises pressure mould, clamp mode, insert, bending die, anti-wrinkling mould, core, pressure mould thermal insulation board, clamp mode thermal insulation board, bending die thermal insulation board and anti-wrinkling mould thermal insulation board; Described core and pressure mould same as the prior art; The side of bending die is the bending die forming face of arcs of recesses, and bending die center is the axis hole coordinated with main shaft of pipe bender, and the bottom surface of bending die is the fitting surface coordinated with bending die thermal insulation board; One side surface of anti-wrinkling mould is the anti-wrinkling mould forming face of arcs of recesses, and a side surface is the fitting surface coordinated with anti-wrinkling mould thermal insulation board, separately has a side to be the fitting surface coordinated with bending die, it is characterized in that:
I, at the upper surface of anti-wrinkling mould, multiple bottoming hole and thermometer hole is evenly equipped with along its length; At the upper surface of bending die, be evenly equipped with multiple bottoming hole and thermometer hole along this bending die circumferencial direction; Bottoming hole and thermometer hole distribute alternately; The number of bottoming hole is determined according to physical knowledge; The number of enabling of bending die bottoming hole is selected according to tubing hot bending demand;
II, at the upper surface of clamp mode and insert, multiple thermometer hole is evenly equipped with along its length; Thermometer hole can measure the change of mold temperature distribution in BENDING PROCESS in real time, and then adjustment mold heated temperature; Thermometer hole is between section of mould molding surface and lathe mating surface, and the quantity and spacing of thermometer hole needs processing according to bending pipes experiment, and the number of enabling of thermometer hole is selected according to titanium alloy tube hot bending demand;
III, described thermal insulation board is all between shaping dies and lathe, and the one side of thermal insulation board and contacting dies is zigzag, and there is air blanketing; Asbestos are plugged with to reduce delivered heat in described air blanketing; The one side that described pressure mould, clamp mode contact with thermal insulation board with anti-wrinkling mould has rectangular channel, reaches location and fixing object by being embedded in rectangular channel the saw-toothed convex portion position on pressure mould thermal insulation board, clamp mode thermal insulation board, anti-wrinkling mould thermal insulation board; Described bending die thermal insulation board is fixing by central shaft hole location; Described pressure mould upper and lower surface, anti-wrinkling mould upper surface, bending die upper surface, insert upper surface, clamp mode upper surface, be all evenly paved with thick-layer asbestos, realizes insulation, heat insulation and protective action.
IV, described pressure mould thermal insulation board is distributed with 2 horizontal water circulation Cooling Holes communicated along its short transverse; Described clamp mode thermal insulation board is distributed with 2 horizontal water circulation Cooling Holes communicated along its short transverse; Described anti-wrinkling mould thermal insulation board is distributed with 2 separate longitudinal directions along its length and runs through water circulation Cooling Holes; Described bending die thermal insulation board is distributed with 6 along its length and separate runs through water circulation Cooling Holes; Need to select the number of Cooling Holes and the flow direction of recirculated cooling water according to tubing hot bending during use;
The present invention have selected exotic material to make shaping dies, effectively improves the temperature of tube bending forming, thus is widely used in the numerical control bending forming of multiple difficult forming titanium alloy pipe.Present invention improves over original tubing numerical-control heating bending die, between shaping dies and lathe, add the thermal insulation board that can pass into recirculated cooling water, therefore, even if under very high heating-up temperature, also can ensure the normal operation of machine.In the present invention, pressure mould, plug, bending die and anti-wrinkling mould are heated, the reasonable temperature distribution that heating-up temperature is simulated according to tubing hot bending is arranged, compared with prior art mould and tubing can be heated to quickly the temperature set, improve the efficiency of heating surface of tubing, avoid non-uniform temperature, and improve titanium alloy tube bending forming quality and forming limit further.It is 76.2mm that the present invention is used for pipe diameter D, and wall thickness t is the bending forming of the large-diameter thin-wall pure titanium tube small-bend radius of 1.0668mm, and hot bending forming limit can be increased to (180 °, 1.5D) from (45 °, 2D) of room temperature.After pipe fitting is bending in forming limit, inner side is wrinkle resistant, surperficial no marking, outside wall thickness reduction < 17%, cross section fasciation rate < 5.0%, can meet the demand of aircraft to large-diameter thin-wall pure titanium tube small-bend radius bent pipe part.
Accompanying drawing explanation
Fig. 1 is that numerical-control heating bending mould of the present invention forms schematic diagram;
Fig. 2 is that numerical-control heating bending mould of the present invention and pipe fitting assemble schematic diagram
Fig. 3 is bending die perforate distribution schematic diagram of the present invention;
Fig. 4 is anti-wrinkling mould perforate distribution schematic diagram of the present invention;
Fig. 5 is plug perforate distribution schematic diagram of the present invention;
Fig. 6 is bending die thermal insulation board Cooling Holes distribution schematic diagram of the present invention;
Fig. 7 is anti-wrinkling mould thermal insulation board Cooling Holes distribution schematic diagram of the present invention;
Fig. 8 is clamp mode thermal insulation board Cooling Holes distribution schematic diagram of the present invention;
Fig. 9 is pressure mould thermal insulation board Cooling Holes distribution schematic diagram of the present invention;
Figure 10 is that numerical-control heating bending mould of the present invention and pipe fitting assemble schematic three dimensional views;
Figure 11 is flow chart of the present invention.Wherein:
1. pressure mould bottoming hole; 2. pressure mould thermometer hole; 3. pressure mould; 4. pressure mould thermal insulation board; 5. plug; 6. plug bottoming hole; 7. plug thermometer hole; 8. core ball; 9. clamp mode; 10. clamp mode thermometer hole; 11. clamp mode thermal insulation boards; 12. inserts; 13. insert thermometer holes; 14. bending dies; 15. bending die bottoming holes; 16. bending die thermometer holes; 17. bending die thermal insulation boards; 18. anti-wrinkling moulds; 19. anti-wrinkling mould bottoming holes; 20. anti-wrinkling mould thermometer holes; 21. anti-wrinkling mould thermal insulation boards; 22. Cooling Holes; 23. pipe fittings.
Detailed description of the invention
Embodiment one
The present embodiment is a kind of titanium pipe numerical control differential heating bending die.
The titanium pipe numerical-control heating bending die that the present invention proposes, comprises pressure mould 3, clamp mode 9, insert 12, bending die 14, anti-wrinkling mould 18, core, pressure mould thermal insulation board 4, clamp mode thermal insulation board 11, bending die thermal insulation board 17 and anti-wrinkling mould thermal insulation board 21; Described core comprises plug 5 and core ball 8.The present embodiment increases bottoming hole and thermometer hole respectively on pressure mould 3, bending die 14, plug 5 and anti-wrinkling mould 18, and clamp mode 9 and insert 12 increase thermometer hole, carries out the bending requirement of titanium pipe numerical-control heating to meet.The present invention increases Cooling Holes 22 on pressure mould thermal insulation board 4, clamp mode thermal insulation board 11, bending die thermal insulation board 17 and anti-wrinkling mould thermal insulation board 21, to meet the requirement of lathe cooling and to ensure that hydraulic system is normal.The concrete technical scheme of the present embodiment is:
The side of described bending die 14 is the bending die forming face of arcs of recesses, for coordinating with the outer surface of bend pipe; The center of bending die 14 is the axis holes coordinated with main shaft of pipe bender; The bottom surface of bending die 14 is the fitting surfaces coordinated with bending die thermal insulation board 17.At the upper surface of bending die 14, from bending die and anti-wrinkling mould 18 cooperation position, be evenly equipped with multiple bending die bottoming hole 15 and bending die thermometer hole 16 along bending die circumferencial direction, and each bending die thermometer hole 16 is between adjacent bending die bottoming hole 15; The quantity of described bending die bottoming hole 15 and bending die thermometer hole 16 is determined by following formula according to the quality of bending die 14, heat time, heating-up temperature and heating rod power:
In formula: n
bhfor the quantity of bending die bottoming hole 15, n
btfor the quantity of bending die thermometer hole 16, C
bfor the specific heat capacity of bending die 14 material, m
bfor the quality of bending die 14, △ T is the temperature that bending die raises, W
bfor the power of single bending die heating rod, t
bfor the heat time of bending die 14;
In the present embodiment, the quantity of described bending die bottoming hole 15 and bending die thermometer hole 16 is 10.
The aperture of described bending die bottoming hole 15 with use the diameter of heating rod to match; The aperture of described bending die thermometer hole 16 and the diameter of institute's use thermocouple match.
Described bending die bottoming hole 15 and bending die thermometer hole 16 are distributed between the bending die forming face of bending die 14 and central shaft hole, and bending die thermometer hole 16 comparatively bending die bottoming hole 15 closer to bending die forming face.Distance between the center line of described bending die bottoming hole 15 and the arc bottom surface of described bending die forming face is 20 ~ 50mm, and in the present embodiment, the distance between the center line of bending die bottoming hole 15 and the arc bottom surface of described bending die forming face is 25mm.
The central axis of described each bending die bottoming hole 15 and bending die thermometer hole 16 is in the upper surface of bending die.Described bending die bottoming hole 15 is through hole, and described bending die thermometer hole 16 is blind hole.
One side surface of described anti-wrinkling mould 18 is the anti-wrinkling mould forming face of arcs of recesses, for coordinating with the outer surface of bend pipe; The opposite side surface of anti-wrinkling mould 18 is the fitting surfaces coordinated with anti-wrinkling mould thermal insulation board 21; Anti-wrinkling mould 18 separately has a side to be the fitting surface coordinated with bending die.At the upper surface of anti-wrinkling mould 18, the length direction along this anti-wrinkling mould is evenly equipped with multiple anti-wrinkling mould bottoming hole 19, and there is anti-wrinkling mould thermometer hole 20 at the half place being equivalent to the spacing of two adjacent anti-wrinkling mould bottoming holes 19 before each anti-wrinkling mould bottoming hole 19; The quantity of anti-wrinkling mould bottoming hole 19 and anti-wrinkling mould thermometer hole 20 is determined by following formula according to the quality of anti-wrinkling mould 18, heat time, heating-up temperature and heating rod power:
In formula: n
whfor the quantity of anti-wrinkling mould bottoming hole 19, n
wtfor the quantity of anti-wrinkling mould thermometer hole 20, C
wfor the specific heat capacity of anti-wrinkling mould 18 material, m
wfor the quality of anti-wrinkling mould 18, △ T is the temperature raised, W
wfor the power of single anti-wrinkling mould heating rod, t
wfor the heat time of anti-wrinkling mould 18;
In the present embodiment, the quantity of described anti-wrinkling mould bottoming hole 19 and anti-wrinkling mould thermometer hole 20 is 4.
The aperture of described anti-wrinkling mould bottoming hole 19 with use the diameter of heating rod to match; The aperture of described anti-wrinkling mould thermometer hole 20 matches with the diameter of the thermocouple used.
Described anti-wrinkling mould bottoming hole 19 and anti-wrinkling mould thermometer hole 20 are distributed between the anti-wrinkling mould forming face of anti-wrinkling mould 18 and thermal insulation board mating surface, and anti-wrinkling mould thermometer hole 20 comparatively anti-wrinkling mould bottoming hole 19 closer to anti-wrinkling mould forming face.Distance between the center line of described anti-wrinkling mould bottoming hole 19 and the arc bottom surface of described anti-wrinkling mould forming face is 20 ~ 50mm, and in the present embodiment, the distance between the center line of anti-wrinkling mould bottoming hole 19 and the arc bottom surface of described anti-wrinkling mould forming face is 25mm.
The central axis of described each anti-wrinkling mould bottoming hole 19 and anti-wrinkling mould thermometer hole 20 is in the upper surface of anti-wrinkling mould 18.Described anti-wrinkling mould bottoming hole 19 is through hole, and described anti-wrinkling mould thermometer hole 20 is blind hole.
The upper surface of described clamp mode 9, is evenly equipped with multiple clamp mode thermometer hole 10 along its length; The upper surface of described insert 12, is evenly equipped with multiple insert thermometer hole 13 along its length; Described clamp mode thermometer hole 10 and insert thermometer hole 13 are blind hole; In the present embodiment, the quantity of clamp mode thermometer hole 10 and insert thermometer hole 13 is 5;
Described all thermal insulation boards are all between shaping dies and lathe, and the one side of thermal insulation board and contacting dies is zigzag, and there is air blanketing; Asbestos are plugged with to reduce delivered heat in described air blanketing; The one side that described pressure mould 3, clamp mode 9 contact with thermal insulation board with anti-wrinkling mould 18 has rectangular channel, reaches location and fixing object by being embedded in rectangular channel the saw-toothed convex portion position on pressure mould thermal insulation board 4, clamp mode thermal insulation board 11, anti-wrinkling mould thermal insulation board 21; Described bending die thermal insulation board 17 is fixing by central shaft hole location; Described pressure mould 3 upper and lower surface, anti-wrinkling mould 18 upper surface, bending die 14 upper surface, insert 12 upper surface, clamp mode 9 upper surface, be all evenly paved with thick-layer asbestos, realizes insulation, heat insulation and protective action.
Tell pressure mould thermal insulation board 4 and be distributed with 2 Cooling Holes communicated 22 along its short transverse; Clamp mode thermal insulation board 11 is distributed with 2 Cooling Holes communicated 22 along its short transverse; Anti-wrinkling mould thermal insulation board 21 is distributed with 2 separate Cooling Holes 22 along its length; Bending die thermal insulation board 17 is distributed with 6 separate Cooling Holes 22 along its length.Described Cooling Holes 22 is all through hole.During use, select the number of Cooling Holes 22 and the flow direction of recirculated cooling water as required.
In the present embodiment, pressure mould 3, plug 5 and core ball 8 are all identical with prior art.
In the present embodiment, the material of pressure mould 3, plug 5, core ball 8, clamp mode 9, bending die 14 and anti-wrinkling mould 18 is the high temperature resistant high strength H13 steel reaching 600 DEG C, to improve mould versatility; Cooling system comprises pressure mould thermal insulation board 4, clamp mode thermal insulation board 11, bending die thermal insulation board 17 and anti-wrinkling mould thermal insulation board 21; Because the operating temperature of cooling system mould is necessarily lower than bending mould, therefore identical with insert 14 selection, all select Long-term service temperature can reach the 35CrMo structural alloy steel of 500 DEG C.
Embodiment two
The present embodiment is the method utilizing die numerical control thermal bending shaping titanium pipe described in embodiment one.
The CP-3 tubing of to be specification be Φ 76.2 × t1.0668 that the present embodiment adopts, namely caliber D is 76.2mm, and wall thickness t is the pure titanium pipe of 1.0668mm, the D/t=71.4 of this pure titanium pipe, radius of curvature R=1.5D.The equipment that the present embodiment uses is W27YPC-159 CNC tube bending machine.
Specific implementation process comprises the following steps:
The first step, mould and bending machine heat insulation.Pressure mould thermal insulation board 4 is laid between the fitting surface and lathe joint face of pressure mould 3, anti-wrinkling mould thermal insulation board 21 is laid between anti-wrinkling mould 18 and lathe joint face, between bending die 14 fitting surface and lathe joint face, lay bending die thermal insulation board 17, between the fitting surface and lathe joint face of clamp mode 9, lay clamp mode thermal insulation board 11; At upper surface and the lower surface of pressure mould 3, and the upper surface of the upper surface of clamp mode 9, the upper surface of insert 12, the upper surface of bending die 14 and anti-wrinkling mould 18 is all paved with the thick asbestos of 2cm.
Second step, assemblage and adjustment mould.It is published thin-walled tube NC bending shaping dies adjustment method debugging mould in the innovation and creation of CN101422792A according to publication number.During assemblage and adjustment mould, pressure mould 3, clamp mode 9, insert 12, bending die 14, anti-wrinkling mould 18 and core are installed on bending machine, open bending machine, and according to the adjustment of thin-walled tube NC bending shaping dies adjustment method pressure mould 3, clamp mode 9, anti-wrinkling mould 18 and core, make the center line of the forming face of the center line of each forming face on described pressure mould 3, clamp mode 9, anti-wrinkling mould 18 and the center line of plug 5 and insert 12 and bending die 14 be positioned at same level; Plug 5 overhang is made to be 4mm; By clamp mode 9 and insert 12, pipe fitting 23 is clamped completely, ensure that in pipe fitting 23 BENDING PROCESS, retained part does not skid; Make the cutting edge end of anti-wrinkling mould 18 concordant with bending point of contact, and the forming face of anti-wrinkling mould 18 and pipe fitting 23 are fitted tightly, the faying face of anti-wrinkling mould 18 and the forming face of bending die 14 are fitted completely; The relative position of adjustment pressure mould 3, makes pipe fitting 23 fit tightly with the forming face of anti-wrinkling mould 18 by pressure mould 3 when ensureing assembling.After having adjusted, pressure mould 3, clamp mode 9, insert 12, bending die 14, anti-wrinkling mould 18 are returned to initial position.
3rd step, bending machine rate of bending and bending time pressure mould 3 boosting speed setting.
Setting pipe machine rate of bending:
The rate of bending of setting bending machine is 1 ~ 5 °/s, and when ratio D/t >=70 of caliber D and thickness of pipe wall t, rate of bending chooses 1 ~ 3 °/s to ensure forming quality; As D/t<70, rate of bending chooses 3 ~ 5 °/s to improve bending efficiency.In the present embodiment, bending machine rate of bending is 3 °/s.
The boosting speed of pressure mould 3 when setting is bending:
Make pressure mould 3 at the move under influence of bending machine, when the boosting speed of pressure mould 3 bends with pipe fitting 23, the linear velocity of this pipe fitting axis is identical, the setting of pressure mould 3 boosting speed when completing bending.In the present embodiment, the boosting speed of pressure mould 3 is 5.98mm/s.Set rear closedown bending machine.
4th step, the setting of pipe fitting 23 angle of bend.According to pipe fitting forming requirement, pipe fitting 23 angle of bend is 0 ° ~ 185 °; In the present embodiment, pipe fitting 23 angle of bend is 180 °.
5th step, the lubrication of mould and pipe fitting 23.The high temperature resistant solid lubrication cream of even application one deck on anti-wrinkling mould 18, plug 5 and core ball 8.
6th step, the installation of heating and attemperating unit.Placement force mould heating rod in pressure mould bottoming hole 1, bending die heating rod is placed in bending die bottoming hole 15, plug heating rod is placed in plug bottoming hole 6, in anti-wrinkling mould bottoming hole 19, place anti-wrinkling mould heating rod, and place thermocouple respectively in described each pressure mould thermometer hole 2, each bending die thermometer hole 16, each plug thermometer hole 7, each clamp mode thermometer hole 10, each insert thermometer hole 13 and each anti-wrinkling mould thermometer hole 20.The wire of the wire of described pressure mould heating rod, plug heating rod, the wire of bending die heating rod are connected with the control port of temperature controller respectively with the wire of anti-wrinkling mould heating rod.The wire of described each thermocouple is connected with the measurement port of temperature controller respectively.
In the present embodiment, enable the heating rod laid respectively in 6 bending die bottoming holes 15 of anti-wrinkling mould 18 side, and all enable the thermocouple laid respectively in clamp mode thermometer hole 10 and in insert thermometer hole 13.
7th step, setting heating-up temperature.Described heating-up temperature comprises the heating-up temperature T of pressure mould
1, plug heating-up temperature T
2, bending die heating-up temperature T
4with the heating-up temperature T of anti-wrinkling mould
3:
The heating-up temperature of setting plug 5 heating-up temperature and pressure mould 3 is 200 ~ 300 DEG C; The heating-up temperature of anti-wrinkling mould 18 heating-up temperature and bending die 14 is 180 ~ 250 DEG C.
T during concrete heating
1>=T
2>=T
3; When the radius of curvature R of pipe fitting reduces, T
1-T
3value should increase.
In the present embodiment, by the heating-up temperature T of temperature controller setting pressure mould
1be 300 DEG C, setting plug adds hot temperature temperature T
2be 250 DEG C, the heating-up temperature T of bending die
4be 200 DEG C, the heating-up temperature T of anti-wrinkling mould
3it is 200 DEG C.In the present embodiment, the impact of described each mold heated temperature on lathe is less, therefore does not enable cooling system.
8th step, pipe fitting bends.Open bending machine lathe, pressure mould 3, clamp mode 9, insert 12, bending die 14, anti-wrinkling mould 18, core and pipe fitting 23 assembles by prior art by operation bending machine; After assembling by heating rod to pressure mould 3, plug 5, bending die 14 and anti-wrinkling mould 18 be heated to set temperature value and be incubated 30 ~ 90s.Heat rear operation bending machine, according to the rate of bending 3 °/s of setting, 180 ° have been bent to pipe fitting 23, obtain the pipe fitting after bending forming 23.
In the present embodiment, pressure mould 3, clamp mode 9, insert 12, bending die 14, anti-wrinkling mould 18 are heated to the temperature value set after assembling with pipe fitting 23, and are incubated 60s.
9th step, unloading.Operation bending machine unclamps each mould; The order of unclamping mould is followed successively by: core, pressure mould 3, clamp mode 9; After taking off the pipe fitting 23 after bending, pressure mould 3, clamp mode 9, insert 12, bending die 14 and core are returned to bending front position, close bending machine, by pipe fitting 23 air cooling to room temperature.
Complete after bending, pipe fitting 23 forming quality after inspection is bending, wrinkle resistant inside the pipe fitting 23 obtained, surperficial no marking, the maximum reduction 16.7% of outside wall thickness, maximum cross-section fasciation rate 4.50%, meets instructions for use completely.
Embodiment three
The TC4 tubing of to be specification be Φ 60 × t1 that the present embodiment adopts, namely caliber D is 60mm, and wall thickness t is the D/t=60 of the titanium alloy tube of 1mm, this titanium alloy tube, radius of curvature R=3D.
Specific implementation process comprises the following steps:
The first step, mould and bending machine heat insulation.Pressure mould thermal insulation board 4 is laid between the fitting surface and lathe joint face of pressure mould 3, anti-wrinkling mould thermal insulation board 21 is laid between anti-wrinkling mould 18 and lathe joint face, between bending die 14 fitting surface and lathe joint face, lay bending die thermal insulation board 17, between the fitting surface and lathe joint face of clamp mode 9, lay clamp mode thermal insulation board 11; The thick asbestos of 2cm are paved with at the upper surface of the upper surface of the upper and lower surface of pressure mould 3, clamp mode 9, the upper surface of insert 12, the upper surface of bending die 14 and anti-wrinkling mould 18.
Second step, assemblage and adjustment mould.It is published thin-walled tube NC bending shaping dies adjustment method debugging mould in the innovation and creation of CN101422792A according to publication number.During assemblage and adjustment mould, pressure mould 3, clamp mode 9, insert 12, bending die 14, anti-wrinkling mould 18 and core are installed on bending machine, open bending machine, and according to the adjustment of thin-walled tube NC bending shaping dies adjustment method pressure mould 3, clamp mode 9, anti-wrinkling mould 18 and core, make the center line of the forming face of the center line of each forming face on described pressure mould 3, clamp mode 9 and anti-wrinkling mould 18 and the center line of plug 5 and insert 12 and bending die 14 be positioned at same level; Fuel plant is made to be 5mm; By clamp mode 9 with insert 12 by the clamping completely of pipe fitting 23, ensure that in pipe fitting 23 BENDING PROCESS, retained part does not skid; Make the cutting edge end of anti-wrinkling mould 18 concordant with bending point of contact, and the forming face of anti-wrinkling mould 18 and pipe fitting 23 are fitted tightly, the faying face of anti-wrinkling mould 18 and the forming face of bending die 14 are fitted completely; The relative position of adjustment pressure mould 3, makes pipe fitting 23 fit tightly with the forming face of anti-wrinkling mould 18 by pressure mould 3 when ensureing assembling.After having adjusted, pressure mould 3, clamp mode 9, insert 12, bending die 14, anti-wrinkling mould 18 are returned to initial position.
3rd step, bending machine rate of bending and bending time pressure mould 3 boosting speed setting.The rate of bending of setting bending machine is 0.05 ~ 5 °/s.In the present embodiment, bending machine rate of bending is 0.3 °/s.
When after the setting of bending machine rate of bending, and then boosting speed when setting pressure mould 3 bends, specifically, make pressure mould 3 at the move under influence of bending machine; When the boosting speed of this pressure mould 3 bends with pipe fitting, the linear velocity of this pipe fitting axis is identical, completes the setting of pressure mould 3 boosting speed.In the present embodiment, the boosting speed of pressure mould 3 is 0.94mm/s.Set rear closedown bending machine.
4th step, the setting of pipe fitting angle of bend.Pipe fitting angle of bend is set as 0 ° ~ 185 °, in the present embodiment as requested, and pipe fitting angle of bend is 60 °.
5th step, the lubrication of mould and pipe fitting 23.The high temperature resistant solid lubrication cream of even application one deck on anti-wrinkling mould 18, plug 5 and core ball 8.
6th step, the installation of heating and attemperating unit.Placement force mould heating rod in pressure mould bottoming hole 1, bending die heating rod is placed in bending die bottoming hole 15, plug heating rod is placed in plug bottoming hole 6, in anti-wrinkling mould bottoming hole 19, place anti-wrinkling mould heating rod, and place thermocouple respectively in pressure mould thermometer hole 2, bending die thermometer hole 16, plug thermometer hole 7, clamp mode thermometer hole 10, insert thermometer hole 13 and anti-wrinkling mould thermometer hole 20; The wire of the wire of the wire of described pressure mould heating rod, plug heating rod, bending die heating rod, the wire of anti-wrinkling mould heating rod are connected with the control port of temperature controller respectively; The wire of described thermocouple is connected with the measurement port of temperature controller respectively.
In the present embodiment, enable the heating rod of 2 bending die bottoming holes 15 be positioned near anti-wrinkling mould 18 side, described in 2 bending die bottoming holes 15 enabling compared with the bending die bottoming hole 15 of other not enabled closer to pipe fitting 23; All enable the thermocouple laid respectively in clamp mode thermometer hole and in insert thermometer hole.
7th step, setting heating-up temperature.Described heating-up temperature comprises the heating-up temperature T of pressure mould
1, plug heating-up temperature T
2, bending die heating-up temperature T
4with the heating-up temperature T of anti-wrinkling mould
3:
The heating-up temperature of setting plug 5 heating-up temperature and pressure mould 3 is 400 ~ 450 DEG C; Anti-wrinkling mould 18 heating-up temperature is 350 ~ 400 DEG C, and the heating-up temperature of bending die 14 is 250 ~ 300 DEG C.
T during concrete heating
1>=T
2>=T
3; When the radius of curvature R of pipe fitting reduces, T
1-T
3value should increase.
In the present embodiment, by the heating-up temperature T of temperature controller setting pressure mould
1be 450 DEG C, setting plug adds hot temperature temperature T
2be 400 DEG C, the heating-up temperature T of bending die
4be 250 DEG C, the heating-up temperature T of anti-wrinkling mould
3it is 350 DEG C.
When the heating-up temperature set is greater than 300 DEG C, need be lowered the temperature to lathe by cooling device.As required Cooling Holes 22 in each thermal insulation board is connected with cooling water circulating device by water pipe.
In the present embodiment, in thermal insulation board, the flow direction of current is as shown in accompanying drawing 6 ~ 9.Cooling Holes 22 in bending die thermal insulation board 17, pressure mould thermal insulation board 4, clamp mode thermal insulation board 11 and anti-wrinkling mould thermal insulation board 21 is all used.
8th step, pipe fitting bends.Open bending machine lathe, pressure mould 3, clamp mode 9, insert 12, bending die 14, anti-wrinkling mould 18, core and pipe fitting 23 assembles by prior art by operation bending machine; By heating rod, also suitably 30 ~ 90s is incubated to the temperature value that pressure mould 3, plug 5, bending die 14 and anti-wrinkling mould 18 are heated to set after assembling; Heat rear operation bending machine, according to the rate of bending 0.3 °/s of setting, 60 ° have been bent to pipe fitting 23, obtain the pipe fitting after bending forming 23.
In the present embodiment, pressure mould 3, clamp mode 9, insert 12, bending die 14, anti-wrinkling mould 18 are heated to the temperature value set after assembling with pipe fitting 23, and are incubated 60s.
9th step, unloading.Operation bending machine unclamps each mould; The order of unclamping mould is followed successively by: core, pressure mould 3 and clamp mode 9; After taking off the pipe fitting 23 after bending, pressure mould 3, clamp mode 9, insert 12, bending die 14, anti-wrinkling mould 18 and core are returned to bending front position, close bending machine, by pipe fitting 23 air cooling to room temperature.
Complete after bending, it is wrinkle resistant that inspection bending forming rear tubular member 23 forming quality obtains arranged at inner side of pipe fitting, and surperficial no marking, wall thickness maximum reduction in outside is 8.8%, and maximum cross-section fasciation rate 4.9%, meets instructions for use completely.
Claims (8)
1. a titanium pipe numerical control differential heating bending die, comprises pressure mould, clamp mode, insert, bending die, anti-wrinkling mould and core; Described core comprises plug and core ball; It is characterized in that, also comprise pressure mould thermal insulation board, clamp mode thermal insulation board, bending die thermal insulation board and anti-wrinkling mould thermal insulation board; Pressure mould, bending die, plug and anti-wrinkling mould there are bottoming hole and thermometer hole respectively, clamp mode and insert have thermometer hole; Described pressure mould thermal insulation board, clamp mode thermal insulation board, bending die thermal insulation board and anti-wrinkling mould thermal insulation board increase Cooling Holes.
2. titanium pipe numerical control differential heating bending die as claimed in claim 1, it is characterized in that, at the upper surface of bending die, from bending die and anti-wrinkling mould cooperation position, be evenly equipped with multiple bending die bottoming hole and bending die thermometer hole along bending die circumferencial direction, and each bending die thermometer hole is between adjacent bending die bottoming hole; The quantity of described bending die bottoming hole and bending die thermometer hole is determined by following formula:
In formula: n
bhfor the quantity of bending die bottoming hole, n
btfor the quantity of bending die thermometer hole, C
bfor the specific heat capacity of bending die material, m
bfor the quality of bending die, △ T is the temperature that bending die raises, W
bfor the power of single bending die heating rod, t
bfor the heat time of bending die; The aperture of described bending die bottoming hole with use the diameter of heating rod to match; The aperture of described bending die thermometer hole and the diameter of institute's use thermocouple match.
3. titanium pipe numerical control differential heating bending die as claimed in claim 1, it is characterized in that, at the upper surface of described anti-wrinkling mould, length direction along this anti-wrinkling mould is evenly equipped with multiple anti-wrinkling mould bottoming hole, and there is anti-wrinkling mould thermometer hole at the half place being equivalent to the spacing of two adjacent anti-wrinkling mould bottoming holes before each anti-wrinkling mould bottoming hole; The quantity of anti-wrinkling mould bottoming hole and anti-wrinkling mould thermometer hole is determined according to following formula:
In formula: n
whfor the quantity of anti-wrinkling mould bottoming hole, n
wtfor the quantity of anti-wrinkling mould thermometer hole, C
wfor the specific heat capacity of anti-wrinkling mould material, m
wfor the quality of anti-wrinkling mould, △ T is the temperature raised, W
wfor the power of single anti-wrinkling mould heating rod, t
wfor the heat time of anti-wrinkling mould.
4. titanium pipe numerical control differential heating bending die as claimed in claim 1, is characterized in that, the upper surface of described clamp mode, is evenly equipped with multiple clamp mode thermometer hole along its length; The upper surface of described insert, is evenly equipped with multiple insert thermometer hole along its length; Described clamp mode thermometer hole and insert thermometer hole are blind hole.
5. titanium pipe numerical control differential heating bending die as claimed in claim 1, it is characterized in that, pressure mould thermal insulation board is between pressure mould and lathe; Clamp mode thermal insulation board is between clamp mode and lathe; Bending die thermal insulation board is between bending die and lathe and be arranged on the central shaft of bending die; Anti-wrinkling mould thermal insulation board is between anti-wrinkling mould and lathe; The surface of described each thermal insulation board and each contacting dies is zigzag, and has spacing between each thermal insulation board and each mould, defines air blanketing; Asbestos pad is had in described air blanketing; The one side that described pressure mould, clamp mode contact with thermal insulation board with anti-wrinkling mould has rectangular channel, reaches location and fixing object by being embedded in rectangular channel by the sawtooth on pressure mould thermal insulation board, clamp mode thermal insulation board, anti-wrinkling mould thermal insulation board; The upper surface of described pressure mould, anti-wrinkling mould upper surface, bending die upper surface, insert upper surface, and the upper surface of clamp mode all spreads and is covered with asbestos pad.
6. titanium pipe numerical control differential heating bending die as claimed in claim 5, is characterized in that, tell pressure mould thermal insulation board and be distributed with 2 Cooling Holes communicated along its short transverse; Clamp mode thermal insulation board is distributed with 2 Cooling Holes communicated along its short transverse; Anti-wrinkling mould thermal insulation board is distributed with 2 separate Cooling Holes along its length; Bending die thermal insulation board is distributed with 6 separate Cooling Holes along its length.
7. utilize a method for die forming titanium pipe described in claim 1, it is characterized in that, detailed process is:
The first step, mould and bending machine heat insulation;
Second step, assemblage and adjustment mould;
3rd step, bending machine rate of bending and bending time pressure mould boosting speed setting;
The rate of bending of setting bending machine is 0.05 ~ 5 °/s;
The boosting speed of pressure mould when setting is bending: when the boosting speed of pressure mould bends with pipe fitting, the linear velocity of this pipe fitting axis is identical, the setting of pressure mould boosting speed when completing bending;
Set rear closedown bending machine;
4th step, the setting of pipe fitting angle of bend; According to pipe fitting forming requirement, pipe fitting angle of bend is 0 ° ~ 185 °;
5th step, the lubrication of mould and pipe fitting; The high temperature resistant solid lubrication cream of even application one deck on anti-wrinkling mould, plug and core ball;
6th step, the installation of heating and attemperating unit; Placement force mould heating rod in pressure mould bottoming hole, bending die heating rod is placed in bending die bottoming hole, plug heating rod is placed in plug bottoming hole, in anti-wrinkling mould bottoming hole, place anti-wrinkling mould heating rod, and place thermocouple respectively in described each pressure mould thermometer hole, each bending die thermometer hole each plug thermometer hole, each clamp mode thermometer hole, each insert thermometer hole and each anti-wrinkling mould thermometer hole; The wire of the wire of described pressure mould heating rod, plug heating rod, the wire of bending die heating rod are connected with the control port of temperature controller respectively with the wire of anti-wrinkling mould heating rod; The wire of described each thermocouple is connected with the measurement port of temperature controller respectively;
7th step, setting heating-up temperature; Described heating-up temperature comprises the heating-up temperature T of pressure mould
1, plug heating-up temperature T
2, bending die heating-up temperature T
4with the heating-up temperature T of anti-wrinkling mould
3:
The heating-up temperature of setting plug heating-up temperature and pressure mould is 200 ~ 450 DEG C; Anti-wrinkling mould heating-up temperature is 180 ~ 400 DEG C, and the heating-up temperature of bending die is 180 ~ 300 DEG C;
T during concrete heating
1>=T
2>=T
3; When the radius of curvature R of pipe fitting reduces, T
1-T
3value should increase;
When the heating-up temperature set is greater than 300 DEG C, Cooling Holes in each thermal insulation board is connected with cooling water circulating device by water pipe, to lower the temperature to lathe;
8th step, pipe fitting bends; Open bending machine lathe, pressure mould, clamp mode, insert, bending die, anti-wrinkling mould, core and pipe fitting are assembled; By heating rod to pressure mould, plug, bending die and anti-wrinkling mould be heated to set temperature value and be incubated 30 ~ 90s; Heat rear operation bending machine, according to the rate of bending 3 °/s of setting, 180 ° have been bent to pipe fitting, obtain the pipe fitting after bending forming;
9th step, unloading.
8. the method for shaping dies shaping titanium pipe as claimed in claim 7, it is characterized in that, in the first step mould and bending machine heat insulation time, pressure mould thermal insulation board is laid between the fitting surface and lathe joint face of pressure mould, anti-wrinkling mould thermal insulation board is laid between anti-wrinkling mould and lathe joint face, between bending die fitting surface and lathe joint face, lay bending die thermal insulation board, between the fitting surface and lathe joint face of clamp mode, lay clamp mode thermal insulation board; At the upper surface of pressure mould, and the upper surface of the upper surface of clamp mode, the upper surface of insert, the upper surface of bending die and anti-wrinkling mould all spreads and is covered with asbestos.
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| CN107716659A (en) * | 2017-11-07 | 2018-02-23 | 太原科技大学 | A kind of double assisted thin-wall pipe deep camber centreless bending dies and its manufacturing process |
| CN106734429B (en) * | 2017-03-21 | 2019-01-01 | 南京航空航天大学 | A kind of aero titanium alloy 3D free bend warm forming device and manufacturing process |
| CN111069370A (en) * | 2019-11-19 | 2020-04-28 | 中国船舶重工集团公司第七二五研究所 | Numerical control heating bending forming method for thick-wall titanium alloy pipe |
| CN113102579A (en) * | 2021-04-09 | 2021-07-13 | 岳阳龙威管道有限公司 | Small-radius bent pipe manufacturing device and using method thereof |
| CN113458215A (en) * | 2021-08-02 | 2021-10-01 | 浙江金马逊机械有限公司 | Pipe bending equipment and pipe bending die heating device thereof |
| US11185904B2 (en) | 2018-01-22 | 2021-11-30 | Nanchang Hangkong University (NCHU) | Differential temperature push bending method and device for tube with small bending radius |
| CN114346021A (en) * | 2021-12-16 | 2022-04-15 | 南京航空航天大学 | Differential temperature free bending forming device and method for pipe made of difficult-to-deform material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106734429B (en) * | 2017-03-21 | 2019-01-01 | 南京航空航天大学 | A kind of aero titanium alloy 3D free bend warm forming device and manufacturing process |
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| US11185904B2 (en) | 2018-01-22 | 2021-11-30 | Nanchang Hangkong University (NCHU) | Differential temperature push bending method and device for tube with small bending radius |
| CN111069370A (en) * | 2019-11-19 | 2020-04-28 | 中国船舶重工集团公司第七二五研究所 | Numerical control heating bending forming method for thick-wall titanium alloy pipe |
| CN113102579A (en) * | 2021-04-09 | 2021-07-13 | 岳阳龙威管道有限公司 | Small-radius bent pipe manufacturing device and using method thereof |
| CN113102579B (en) * | 2021-04-09 | 2022-11-22 | 岳阳龙威管道有限公司 | Small-radius bent pipe manufacturing device and using method thereof |
| CN113458215A (en) * | 2021-08-02 | 2021-10-01 | 浙江金马逊机械有限公司 | Pipe bending equipment and pipe bending die heating device thereof |
| CN114346021A (en) * | 2021-12-16 | 2022-04-15 | 南京航空航天大学 | Differential temperature free bending forming device and method for pipe made of difficult-to-deform material |
| CN114378160A (en) * | 2022-01-13 | 2022-04-22 | 珠海格力智能装备有限公司 | Pipe fitting processing device |
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